From nagle at animats.com  Thu Sep  1 00:22:23 2011
From: nagle at animats.com (John Nagle)
Date: Wed, 31 Aug 2011 21:22:23 -0700
Subject: try... except with unknown error types
In-Reply-To: <4e51a32d$0$29974$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.230.1313780957.27778.python-list@python.org>
	<j2mcne$rmo$1@reader1.panix.com>
	<4e4ec405$0$29994$c3e8da3$5496439d@news.astraweb.com>
	<7xipprsxha.fsf@ruckus.brouhaha.com>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.283.1313954283.27778.python-list@python.org>
	<4e51a32d$0$29974$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e5f089b$0$2148$742ec2ed@news.sonic.net>

On 8/21/2011 5:30 PM, Steven D'Aprano wrote:
> Chris Angelico wrote:
>
>
>> A new and surprising mode of network failure would be indicated by a
>> new subclass of IOError or EnvironmentError.
>
> /s/would/should/
>
> I don't see why you expect this, when *existing* network-related failures
> aren't:
>
>>>> import socket
>>>> issubclass(socket.error, EnvironmentError)
> False
>
> (Fortunately that specific example is fixed in Python 3.)

    I think I reported that some years ago.

    There were some other errors in the URL and SSL area that
weren't subclasses of EnvironmentError.  It's also possible
to get UnicodeError from URL operations.

					John Nagle


From sahil at FreeBSD.org  Thu Sep  1 00:56:50 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Thu, 1 Sep 2011 00:56:50 -0400
Subject: idiomatic analogue of Perl's: while (<>) { ... }
Message-ID: <20110901045650.GA3466@magic.hamla.org>

I've been tasked with converting some programs from Perl -> Python, and
am (as will soon be obvious) new to the language.  A few archive/google
searches were inconclusive on a consensus approach, which is OK, but I
just wonder if there is a more Python-esque way to do the following in
Python 2.7.1:

%%
# unbuffer STDOUT
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

# process input, line-by-line, and print responses after parsing input 
while 1:
  rval = parse(raw_input())
  if rval == None:
    print('foo')
  else:
    print('bar')
%%

This works, but while reading the documentation, I thought of using 'for
line in fileinput.input()' in lieu of 'while 1:' construct.  This does
not work when debugging the program on the command line -- the script
appears to just hang no matter what is typed into STDIN.  I believe this
is because of some internal buffering when using fileinput.  Is there a
recommended way to disable such buffering?  Am I taking a totally wrong
approach?

Feel free to just link me to previous discussions on the topic(s) if I
have missed them.  Please be gentle with your cluebats. :-)

Thanks,
-- 
Sahil Tandon <sahil at FreeBSD.org>


From kushal.kumaran+python at gmail.com  Thu Sep  1 01:21:36 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Thu, 1 Sep 2011 10:51:36 +0530
Subject: How to daemonize a HTTPServer
In-Reply-To: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
References: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
Message-ID: <CAH8GtdMFp5ydv6JB66n_0g=rGiZgn_AtvHH9AC9VpZkjpWYG2A@mail.gmail.com>

On 1 Sep 2011 08:54, "babbu Pehlwan" <nemjain2 at gmail.com> wrote:
>
> I have written a http server using BaseHTTPServer module. Now I want
> to instantiate it through another python script. The issue here is
> after instantiate the control doesn't come back till the server is
> running. Please suggest.

What did a web search for "python daemon" lead to? I believe there's a
python-daemon package available on pypi.

-- 
regards,
kushal
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From steve+comp.lang.python at pearwood.info  Thu Sep  1 02:02:54 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 01 Sep 2011 16:02:54 +1000
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <mailman.644.1314853527.27778.python-list@python.org>
Message-ID: <4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>

On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:

> I've been tasked with converting some programs from Perl -> Python, and
> am (as will soon be obvious) new to the language.  A few archive/google
> searches were inconclusive on a consensus approach, which is OK, but I
> just wonder if there is a more Python-esque way to do the following in
> Python 2.7.1:
> 
> %%
> # unbuffer STDOUT
> sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

I've never bothered with unbuffered stdout, but that looks fine to me.

I'm not sure if it is necessary though, because print seems to automatically
flush the buffer after each line in my testing. Unless you're printing
repeatedly to the same line, I'm not sure unbuffered stdout is helpful.


> # process input, line-by-line, and print responses after parsing input
> while 1:
>   rval = parse(raw_input())
>   if rval == None:
>     print('foo')
>   else:
>     print('bar')
> %%

"while True" is considered slightly more idiomatic (readable), but
otherwise, that seems fine.

 
> This works, but while reading the documentation, I thought of using 'for
> line in fileinput.input()' in lieu of 'while 1:' construct.  This does
> not work when debugging the program on the command line -- the script
> appears to just hang no matter what is typed into STDIN.  I believe this
> is because of some internal buffering when using fileinput.  Is there a
> recommended way to disable such buffering?  Am I taking a totally wrong
> approach?

I'm not sure anything about fileinput is exactly *recommended*, it's kinda
discouraged on account of being a bit slow. See help(fileinput) at the
interactive prompt.

For what it's worth, the default buffersize for fileinput.input is 0, so if
that doesn't do what you want, I don't think fileinput is the right
solution.



-- 
Steven



From __peter__ at web.de  Thu Sep  1 02:31:32 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 08:31:32 +0200
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <20110901045650.GA3466@magic.hamla.org>
Message-ID: <j3n8r3$heg$1@dough.gmane.org>

Sahil Tandon wrote:

> I've been tasked with converting some programs from Perl -> Python, and
> am (as will soon be obvious) new to the language.  A few archive/google
> searches were inconclusive on a consensus approach, which is OK, but I
> just wonder if there is a more Python-esque way to do the following in
> Python 2.7.1:
> 
> %%
> # unbuffer STDOUT
> sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
> 
> # process input, line-by-line, and print responses after parsing input
> while 1:
>   rval = parse(raw_input())
>   if rval == None:
>     print('foo')
>   else:
>     print('bar')
> %%
> 
> This works, but while reading the documentation, I thought of using 'for
> line in fileinput.input()' in lieu of 'while 1:' construct.  This does
> not work when debugging the program on the command line -- the script
> appears to just hang no matter what is typed into STDIN.  I believe this
> is because of some internal buffering when using fileinput.  Is there a
> recommended way to disable such buffering?  Am I taking a totally wrong
> approach?
> 
> Feel free to just link me to previous discussions on the topic(s) if I
> have missed them.  Please be gentle with your cluebats. :-)

A quick look into fileinput.py reveals that it uses readlines() and slurps 
in the complete "file". I'm not sure that was a clever design decision...

Here's a partial reimplementation that should work for your use-case:

import sys
from itertools import chain

def _open_many(files):
    for file in files:
        if file == "-":
            yield sys.stdin
        else:
            with open(file) as f:
                yield f

def input(files=None, buffered=False):
    if files is None:
        files = sys.argv[1:]
    if not files:
        files = ["-"]
    files = _open_many(files)
    if not buffered:
        files = (iter(file.readline, "") for file in files)
    return chain.from_iterable(files)

for line in input():
    print line.strip().upper()




From __peter__ at web.de  Thu Sep  1 03:43:04 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 09:43:04 +0200
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <20110901045650.GA3466@magic.hamla.org>
	<j3n8r3$heg$1@dough.gmane.org>
Message-ID: <j3nd17$ei8$1@dough.gmane.org>

Peter Otten wrote:

> A quick look into fileinput.py reveals that it uses readlines() and slurps
> in the complete "file". I'm not sure that was a clever design decision...

Correction: 

>>> with open("tmp.txt") as f: lines = f.readlines(0)
...
>>> len(lines)
1000000
>>> with open("tmp.txt") as f: lines = f.readlines(1)
...
>>> len(lines)
301
>>> len("".join(lines))
8208

So on my system file.readlines(size) stops after about 2**13 bytes which is 
not a problem memorywise. Sorry for the confusion.



From msamogh at gmail.com  Thu Sep  1 03:48:52 2011
From: msamogh at gmail.com (Amogh M S)
Date: Thu, 1 Sep 2011 13:18:52 +0530
Subject: Constructors...BIIIIG PROBLEM!
Message-ID: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>

Hey guys...
I think we have a problem with my _init_ method and the constructor
When I create a class and its _init_ method and try to create an object of
it outside the class,
Say, something like

class S:
   def _init_(self, name=None):
       self.name = name
s = S("MyName")

It says that the constructor takes no arguments!! I have to explicitly call
the _init_ method which, I think is not the right way of doing things...
Could you tell me if that is what is supposed to happen or is something
wrong with my code?
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From __peter__ at web.de  Thu Sep  1 03:56:11 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 09:56:11 +0200
Subject: Constructors...BIIIIG PROBLEM!
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
Message-ID: <j3ndpq$hf9$1@dough.gmane.org>

Amogh M S wrote:

> Hey guys...
> I think we have a problem with my _init_ method and the constructor
> When I create a class and its _init_ method and try to create an object of
> it outside the class,
> Say, something like
> 
> class S:
>    def _init_(self, name=None):

Your __init__() method needs two leading and two trailing underscores.

>        self.name = name
> s = S("MyName")
> 
> It says that the constructor takes no arguments!! I have to explicitly
> call the _init_ method which, I think is not the right way of doing
> things... Could you tell me if that is what is supposed to happen or is
> something wrong with my code?




From motoom at xs4all.nl  Thu Sep  1 04:00:27 2011
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 1 Sep 2011 10:00:27 +0200
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
Message-ID: <8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>


On Sep 1, 2011, at 09:48, Amogh M S wrote:

> Hey guys... 
> I think we have a problem with my _init_ method and the constructor
> When I create a class and its _init_ method and try to create an object of it outside the class,
> Say, something like
> 
> class S:
>    def _init_(self, name=None):
>        self.name = name
> s = S("MyName")

Two things: Derive your class from object, and the constructor function should be '__init__', that is, with *two* underscores before and after it. Are you reading a book or tutorial which does use a badly chosen font which doesn't distinguish two consecutive underscores well?

class S(object):
    def __init__(self, name=None):
        self.name = name

s = S("MyName")
print s.name

Greetings,


-- 
"If you don't know, the thing to do is not to get scared, but to learn." - Ayn Rand      





From airween at gmail.com  Thu Sep  1 04:24:29 2011
From: airween at gmail.com (=?utf-8?Q?Heged=C3=BCs?= Ervin)
Date: Thu, 1 Sep 2011 10:24:29 +0200
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
	<8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
Message-ID: <20110901082427.GA18046@arxnet.hu>

hello,

On Thu, Sep 01, 2011 at 10:00:27AM +0200, Michiel Overtoom wrote:
> On Sep 1, 2011, at 09:48, Amogh M S wrote:
[...]
> > class S:
> >    def _init_(self, name=None):
> >        self.name = name
> > s = S("MyName")
> 
> Two things: Derive your class from object,

why's that better than just create a simple class, without
derive?


thanks:

a.



From motoom at xs4all.nl  Thu Sep  1 05:04:18 2011
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 1 Sep 2011 11:04:18 +0200
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <20110901082427.GA18046@arxnet.hu>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
	<8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
	<20110901082427.GA18046@arxnet.hu>
Message-ID: <85112CB3-E5C1-42F5-9F2C-EFDFB3086EB0@xs4all.nl>


On Sep 1, 2011, at 10:24, Heged?s Ervin wrote:

> On Thu, Sep 01, 2011 at 10:00:27AM +0200, Michiel Overtoom wrote:
>> Derive your class from object,
> 
> why's that better than just create a simple class, without
> derive?

Amongst other things, fixes to the type system and the method resolution order.

http://docs.python.org/reference/datamodel.html#new-style-and-classic-classes
http://unspecified.wordpress.com/2010/11/18/pythons-new-classes-vs-old-classes/
http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html
http://www.python.org/download/releases/2.2.3/descrintro/

Greetings,

-- 
"If you don't know, the thing to do is not to get scared, but to learn." - Ayn Rand      





From dotancohen at gmail.com  Thu Sep  1 05:42:04 2011
From: dotancohen at gmail.com (Dotan Cohen)
Date: Thu, 1 Sep 2011 12:42:04 +0300
Subject: Regex to match all trailing whitespace _and_ newlines.
Message-ID: <CAKDXFkPG8d+k0rgM131UFqf6LvsnyRmV-hctpOq0RSA6myVRGw@mail.gmail.com>

In the terrific Anki [1] application I am trying to remove trailing
whitespace from form fields. This is my regex:
[\n+\s+]$

Actually, even simplifying it to [\n] or [\r\n] is not matching any
newlines! What might be the cause of this? Note that I am not entering
the regex in Python code, I am entering it in a regex-supporting
Find/Replace dialogue in Anki. Anki is written in Python.

Thanks.

[1] ankisrs.net

-- 
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com


From __peter__ at web.de  Thu Sep  1 06:30:15 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 12:30:15 +0200
Subject: Regex to match all trailing whitespace _and_ newlines.
References: <mailman.653.1314870127.27778.python-list@python.org>
Message-ID: <j3nmqm$vp4$1@solani.org>

Dotan Cohen wrote:

> In the terrific Anki [1] application I am trying to remove trailing
> whitespace from form fields. This is my regex:
> [\n+\s+]$

My attempt:

>>> sub = re.compile(r"\s*?(\n|$)").sub
>>> sub("<EOL>", "alpha   \nbeta   \r\n\ngamma\n")
'alpha<EOL>beta<EOL><EOL>gamma<EOL>'
>>> sub("<EOL>", "alpha   \nbeta   \r\n\ngamma")
'alpha<EOL>beta<EOL><EOL>gamma<EOL>'
>>> sub("<EOL>", "alpha   \nbeta   \r\n\ngamma\t")
'alpha<EOL>beta<EOL><EOL>gamma<EOL>'



From fnautaNO at SPAMsolfon.nl  Thu Sep  1 06:30:40 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Thu, 1 Sep 2011 12:30:40 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net>
	<mailman.620.1314810894.27778.python-list@python.org>
Message-ID: <9c9578F5eaU1@mid.individual.net>

"Paul K?lle" <paul at subsignal.org> wrote in message 
news:mailman.620.1314810894.27778.python-list at python.org...
> Hi, answers below...
>
> Am 31.08.2011 14:18, schrieb Fokke Nauta:
>> "Paul K?lle"<paul at subsignal.org>  wrote in message
>> news:mailman.595.1314780791.27778.python-list at python.org...
>>> Hi,
>>>
>>> Am 30.08.2011 22:00, schrieb Fokke Nauta:
>>>> Hi all,
>>>>
>>>> I am completely new to Python, but I'm confronted with a problem I 
>>>> can't
>>>> solve.
>>> Welcome to python.
>>>
>>>> This is my question:
>>> [snip]
>>>
>>>> I installed Python 3.2.1 and extracted the packages PyWebDAV and PyXML.
>>>> Now
>>>> I have a working Python app and 2 directories called PyWebDAV-0.9.4.1 
>>>> and
>>>> PyXML-0.8.4. In the PyWebDAV README it says:
>>>>
>>>> Installation and setup of server can be as easy as follows:
>>>>
>>>> $ easy_install PyWebDAV
>>>> $ davserver -D /tmp -n -J
>>>>
>>>> But of course it doesn't work like that. When I start up Python GUI I 
>>>> see
>>>> the ">>>" prompt instead of the "$" prompt. But where do I place the 
>>>> two
>>>> directories? And there is no easy_install script in the PyXML-0.8.4
>>>> directory, only a setup.py and ez_setup.py script. I guess the latter 
>>>> is
>>>> the
>>>> one to use. But how?
>>> You dont install from "Python GUI", use normal cmd, navigate to the 
>>> folder
>>> you downloaded PyXML and PyWebDAV and run "python setup.py install"
>>> (python.exe has to be in your PATH). Then you have to find the
>>> startup-script "davserver". Find your python installation directory and
>>> look into<Install dir>/Tools/Scripts, in my computer this is
>>> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
>>> site-packages folder i.e. E:\python27\Lib/site-packages. You might have 
>>> to
>>> look for "davserver" there...
>>>
>>
>> Thanks, Paul.
>>
>> I ran "python setup.py install" in both the PyXML and PyWebDAV 
>> directories.
>> A lot of things happened and are added into those directories and I guess 
>> it
>> will be OK.
>> Next step, the startup-script "davserver". There is no script as such, 
>> also
>> not in \python27\tools\scripts.
>> I found 2 similar scripts:
>> 1. server.py in D:\Python27\WebDAV\PyWebDAV\DAVServer
>> 2. WebDAVServer.py in D:\Python27\WebDAV\PyWebDAV\DAV
>>
>> Which one is the one to use?
> Your install locations look odd, but it might work nevertheless. The 
> server is in DAVServer\server.py, you can look at the file and you will 
> see:
>
> if __name__ == '__main__':
>     run()
>
> at the bottom. This is the "entry point" of a python script if called from 
> the command line.

Yes, it was server.py.

> My install looks a bit different but I can start the server as follows:
> python.exe 
> E:\Python27\Lib\site-packages\pywebdav-0.9.4.1-py2.7.egg\DAVServer\server.py 
>  -D c:\home -n
> WARNING:pywebdav:Authentication disabled!
> Listening on localhost (8008)

I used server.py e:/wwwroot -m -c config.ini

>> I also configured config.ini in D:\Python27\WebDAV\PyWebDAV\DAVServer
> I would use a config file outside the program directory and use the -c 
> or --config switch, run server.py without arguments to see possible 
> startup options.
>
>>
>> In this file it says:
>> "# Auth Database Table, Must exists in database prior to firstrun
>> dbtable=webDav
>>
>> # Create User Database Table and Insert system user"
>>
>> I created in MySQL a database called webDav.
>> I can create a table called User, but how many fields?
> Don't know if that's documented somewhere but you can just look at the 
> code in mysqlauth.py in the same directory as server.py. Seems it needs 
> three columns, (User<string>,Pass<string>,can_write<0|1>) but I haven't 
> tried.
>

I have understood that the database will be configured with the first run, 
but in my case it didn't.

In my congig.ini there was
# Create User Database Table and Insert system user
# Disable after the Table is created; for performance reasons
firstrun=1

Fokke




From fnautaNO at SPAMsolfon.nl  Thu Sep  1 06:30:43 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Thu, 1 Sep 2011 12:30:43 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net>
	<mailman.643.1314851358.27778.python-list@python.org>
Message-ID: <9c9578F5eaU2@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message
news:mailman.643.1314851358.27778.python-list at python.org...
> On Wed, 31 Aug 2011 14:18:00 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>>
>> I also configured config.ini in D:\Python27\WebDAV\PyWebDAV\DAVServer
>>
>> In this file it says:
>> "# Auth Database Table, Must exists in database prior to firstrun
>> dbtable=webDav
>>
>> # Create User Database Table and Insert system user"
>>
>> I created in MySQL a database called webDav.
>> I can create a table called User, but how many fields?
>>
> After looking at the config file.
>
> I presume you have specified the MySQL username/password

Sure

> (personally, and out of paranoia, I'd create a webDAV user/password that
> only has access rights to the specified webDAV database).
>
> Next, if you'd read further and didn't take the comment as the
> instruction. set
> firstrun=1

I did

> to tell the server this is the first time it is being run - IT WILL
> create the database table (after the first start, reset the flag to 0 to
> speed up later runs).

It didn't create the table. The database kept empty.

> Later in the config file set
> mysql_auth=1
> to enable the use of MySQL, and set the admin user/password to what you
> plan to have it use.

I did

> You probably want to set
> daemonize=1
> (maybe after first run)

I left this to 0.

> Oh, and don't forget to set the main data directory and any
> port/host changes.

I left host and port as they were. The main directory is e:\wwwroot

> Start the server - it should connect to MySQL, create the table, and
> add the admin user to the table.

I started the server with server.py (in
D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini

The seems to work as I get a login screen in the browser.

Later on I changed the ini file:

# disable auth
noauth = 1

# Enable mysql auth
mysql_auth=0

No login screen anymore but I got an error message "fshandler:get_data: 
e:\wwwroot not found"

Fokke





From martin.hellwig at gmail.com  Thu Sep  1 06:32:35 2011
From: martin.hellwig at gmail.com (Martin P. Hellwig)
Date: Thu, 01 Sep 2011 11:32:35 +0100
Subject: How to daemonize a HTTPServer
In-Reply-To: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
References: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
Message-ID: <j3nmvr$98t$1@dont-email.me>

On 01/09/2011 04:16, babbu Pehlwan wrote:
> I have written a http server using BaseHTTPServer module. Now I want
> to instantiate it through another python script. The issue here is
> after instantiate the control doesn't come back till the server is
> running. Please suggest.

Sounds like something you could use the multiprocessing module for, but 
then again my crystal ball is a bit fuzzy today.

-- 
mph


From andrei.lisnic at gmail.com  Thu Sep  1 06:40:25 2011
From: andrei.lisnic at gmail.com (UncleLaz)
Date: Thu, 1 Sep 2011 03:40:25 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
Message-ID: <058cb764-2ba2-4b63-be4d-33307a9a81cc@g31g2000yqh.googlegroups.com>

On Aug 31, 5:35?pm, "T. Goodchild" <tgoodch... at gmail.com> wrote:
> I?m new to Python, and I love it. ?The philosophy of the language (and
> of the community as a whole) is beautiful to me.
>
> But one of the things that bugs me is the requirement that all class
> methods have 'self' as their first parameter. ?On a gut level, to me
> this seems to be at odds with Python?s dedication to simplicity.
>
> For example, consider Python?s indent-sensitive syntax. ?Although
> other languages didn?t use indentation to specify scope, programmers
> always used indentation anyways. ?Making indentation took a common
> practice, made it a rule, and the result was a significantly improved
> signal-to-noise ratio in the readability of Python code.
>
> So why is 'self' necessary on class methods? ?It seems to me that the
> most common practice is that class methods *almost always* operate on
> the instance that called them. ?It would make more sense to me if this
> was assumed by default, and for "static" methods (methods that are
> part of a class, but never associated with a specific instance) to be
> labelled instead.
>
> Just curious about the rationale behind this part of the language.

It's required to make distinction between objects inside the calss and
outside of it. Seems pretty logical to me.


From yasar11732 at gmail.com  Thu Sep  1 06:51:43 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 1 Sep 2011 13:51:43 +0300
Subject: Invoking profile from command line prevent my sys.path modification
Message-ID: <CAFEUn8YAG5P92XTHaubMuX_NFG0b28+yhFkR3yf2QxQ4u5gFpQ@mail.gmail.com>

Hi,

I am new to profile module, so I am sorry if this is an absolute beginner
question. In order to my code to run, I need to add a directory to sys.path.
When I invole python -m profile myfile.py, my code won't work, saying that
the thing that is supposed to be in path, isn't. Code works fine without
profiling. Profiling works if I write it into the file, but I don't prefer
doing that, if that is possible.

-- 
http://yasar.serveblog.net/
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From motoom at xs4all.nl  Thu Sep  1 07:23:54 2011
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 1 Sep 2011 13:23:54 +0200
Subject: Why do class methods always need 'self' as the first parameter?
In-Reply-To: <058cb764-2ba2-4b63-be4d-33307a9a81cc@g31g2000yqh.googlegroups.com>
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<058cb764-2ba2-4b63-be4d-33307a9a81cc@g31g2000yqh.googlegroups.com>
Message-ID: <2B38B9D1-4DD5-4E88-B4DB-324A677C6BD1@xs4all.nl>


> On Aug 31, 5:35 pm, "T. Goodchild" <tgoodch... at gmail.com> wrote:


>> So why is 'self' necessary on class methods?
>> 
>> Just curious about the rationale behind this part of the language.

When instance variables are accessed with the 'self.varname' syntax, it is clear to the programmer that an instance variable is accessed, and not some global.  Other languages have weird syntax conventions like that you have to prepend all instance attributes with an '@', and in languages like C++ where there is not necessarily such a syntactic requirement, many programmers use ad-hoc constructs like '_varname' or 'm_varname' to make the distinction clear.


>> It seems to me that the
>> most common practice is that class methods *almost always* operate on
>> the instance that called them.  It would make more sense to me if this
>> was assumed by default, and for "static" methods (methods that are
>> part of a class, but never associated with a specific instance) to be
>> labelled instead.

Yes, you have a point there. My personal preference would be to optimize for the most common case, while exceptions to the norm are still possible, but perhaps a bit more verbose.

Greetings

-- 
"Learn to value yourself, which means: fight for your happiness."  - Ayn Rand      



From johnroth1 at gmail.com  Thu Sep  1 08:45:36 2011
From: johnroth1 at gmail.com (John Roth)
Date: Thu, 1 Sep 2011 05:45:36 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
Message-ID: <42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>

On Aug 31, 8:35?am, "T. Goodchild" <tgoodch... at gmail.com> wrote:
> I?m new to Python, and I love it. ?The philosophy of the language (and
> of the community as a whole) is beautiful to me.
>
> But one of the things that bugs me is the requirement that all class
> methods have 'self' as their first parameter. ?On a gut level, to me
> this seems to be at odds with Python?s dedication to simplicity.
>
> For example, consider Python?s indent-sensitive syntax. ?Although
> other languages didn?t use indentation to specify scope, programmers
> always used indentation anyways. ?Making indentation took a common
> practice, made it a rule, and the result was a significantly improved
> signal-to-noise ratio in the readability of Python code.
>
> So why is 'self' necessary on class methods? ?It seems to me that the
> most common practice is that class methods *almost always* operate on
> the instance that called them. ?It would make more sense to me if this
> was assumed by default, and for "static" methods (methods that are
> part of a class, but never associated with a specific instance) to be
> labelled instead.
>
> Just curious about the rationale behind this part of the language.

I personally consider this to be a wart. Some time ago I did an
implementation analysis. The gist is that, if self and cls were made
special variables that returned the current instance and class
respectively, then the compiler could determine whether a function was
an instance or class method. If it then marked the code object
appropriately you could get rid of all of the wrappers and the
attendant run-time overhead.

I've never published the analysis because that train has already left
the shed. The earliest it could be considered would be 4.0, which
isn't even on the horizon.

John Roth


From lanyjie at yahoo.com  Thu Sep  1 09:43:54 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Thu, 1 Sep 2011 06:43:54 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
Message-ID: <1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>

Hi Matt,

=======================================================
From: Matt Joiner <anacrolix at gmail.com>


The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
already heavily used by other syntactical structures.?

=======================================================

How about only require indentation
to freely break lines? Here is an example:

x = firstpart * secondpart #line breaks here
+ anotherpart #continue by indentation
+ stillanother #continue on.
#until here, another line starts by dedentation?
y = some_expression?- another_one

All this would be completely compatible with former code, while
having almost free line breaking! Plus, indentation makes it pretty.

Really hope Python can have freedom in breaking lines.

Yingjie
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From ian.g.kelly at gmail.com  Thu Sep  1 09:57:00 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 07:57:00 -0600
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <85112CB3-E5C1-42F5-9F2C-EFDFB3086EB0@xs4all.nl>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
	<8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
	<20110901082427.GA18046@arxnet.hu>
	<85112CB3-E5C1-42F5-9F2C-EFDFB3086EB0@xs4all.nl>
Message-ID: <CALwzidkcoJAFRtsjTBHeu4=PD17cmu6g0sb5tqPG03XeLFJ1_g@mail.gmail.com>

On Thu, Sep 1, 2011 at 3:04 AM, Michiel Overtoom <motoom at xs4all.nl> wrote:
>
> On Sep 1, 2011, at 10:24, Heged?s Ervin wrote:
>
>> On Thu, Sep 01, 2011 at 10:00:27AM +0200, Michiel Overtoom wrote:
>>> Derive your class from object,
>>
>> why's that better than just create a simple class, without
>> derive?
>
> Amongst other things, fixes to the type system and the method resolution order.
>
> http://docs.python.org/reference/datamodel.html#new-style-and-classic-classes
> http://unspecified.wordpress.com/2010/11/18/pythons-new-classes-vs-old-classes/
> http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html
> http://www.python.org/download/releases/2.2.3/descrintro/

That is for Python 2.  For Python 3, old-style classes are gone, all
classes derive from object by default, and writing it explicitly is
merely good style for compatibility.


From dalist0 at gmail.com  Thu Sep  1 10:05:20 2011
From: dalist0 at gmail.com (Daniel)
Date: Thu, 1 Sep 2011 07:05:20 -0700 (PDT)
Subject: fun with nested loops
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>

Hi Steve,

Thanks for your comments, I appreciate any input.
> Do you think the software in the Apple iPod is "simple"? Or Microsoft
No, that's much more complicated that what I am doing.
But the iPod probably (?) doesn't get new algorithms based on a
specification discussed with non-programmers once a month.

I didn't explain enough of what I am doing. This is a fairly complex
application that has been running for a few years now,
I am just trying to improve it. The code runs a big
test machine, that runs >100000 individual tests in one run on
something like semiconductor chips.

The specification of these tests is already very complex, it has the
form of the nested loops,
for all these configurations try these steps, if they fail try them
again n times, if it still doesn't work give up
this configuration, if it works continue on to the next steps etc.
That's the form the specification is in, and it makes sense and is
very readable.
In pseudocode it looks like this, I am using @ to give loops a name:

@loop1
for c in configurations:
    @loop2
    while not_done:
        @loop3
        while step1_did_not_work:
            @loop4
            for substeps in step1 # loop 4a
                if hopeless(): continue loop1 # run next configuration
                if substepsFailed(): restart loop4 # try again
                if substepsWorked(): break loop3 # go on to next
steps, like loop4

That format is fine, everyone involved can understand it, even the
people in charge. I'd like to make this executable without
changing too much of the form. It would be possible to do this as a
FSM, but then you'd loose the line to line correspondence with the
specification, and of course some errors always creep in.

> non-CS people to be hacking the source code, they only interact with the
This is a research setting, so the person running the machine will
have to change the source from time to time if
he gets a new specification. The specifications are far to complex to
be entered into a user interface because of all the loops.

> the code by splitting it into functions appropriately, instead of the
> spaghetti code you have (apparently) written with jumps all over the place.
I wouldn't call the example above spaghetti code in the sense of old
Fortran or Basic full of gotos.
In a language that can break out of nested loops this is highly
structured code.
I am not jumping forward to labels, not jumping into functions, not
using jumps to replace loops etc.

It is like the Fortran example (just to show the syntax, has an
infinite loop), everyone can understand that right away, even
non Fortran people:

10 loop1: do I=1,3
    loop2: do J=1,4
        print *,I,J
        goto 10 ! redo loop1
        cycle loop1
        exit loop1
    enddo loop2
enddo loop1

There is no wild jumping her. The only problem is that Fortran does
not allow to restart a loop, so instead of restart loop1 you have to
do a goto 10. Otherwise you could do entirely without gotos (like in
Ruby with the redo, which is of course much much better)

> To take the most obvious, simple example: any time you have a loop that you
> might want to redo, the right solution is to put the loop inside a
> function, and then "redo the loop" becomes "call the function again".
Doesn't work, because it can only redo one level, to break out of the
next loop, I'd need exceptions anyway.
And having all of these exceptions as gotos doesn't make it more
readable.
Replacing loop4 by a function makes it possible to replace the restart
loop4 by a return, but then I still need an exception to
continue loop1 and one to break out of loop4 to indicate that we can
go on to the next step.

> I suppose that, just possibly, your application really would benefit from
> named labels to jump to. But if so, you've stumbled across something rarer
> than iridium.

Don't think so. I am doing that all of the time in other languages,
and I am convinced the named loops (not raw labels+gotos, which are
just a necessary evil) are beautiful and clean things.
They have a lot of symmetry, break is always break, not sometimes
break, sometimes return and sometimes raise breakSomeLoopExcept().
Rewriting the simple Fortran example above in Python would be much,
much uglier and more difficult to comprehend.
You always call break and continue with a label, searching for that
label will tell you right away which loop the break breaks.
I am always doing that, even if there is only one loop. break and
continue (without label) are IMO (please no flame war about that)
worse than goto, at least the goto tells you where it goes, with break/
continue you always have to scan the surroundings to find the right
loop.

I know I am not the only one who is trying to solve that problem, I
was hoping someone has come up with a hack to solve it, like this goto
Chis has come up with. I have to play with that a bit.



Dan



From ian.g.kelly at gmail.com  Thu Sep  1 10:26:53 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 08:26:53 -0600
Subject: Why do class methods always need 'self' as the first parameter?
In-Reply-To: <42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
Message-ID: <CALwzidm1P8=9u3iN5iwVTq3TcxfVs3OLiMfo6x2+t0gD=RhESQ@mail.gmail.com>

On Thu, Sep 1, 2011 at 6:45 AM, John Roth <johnroth1 at gmail.com> wrote:
> I personally consider this to be a wart. Some time ago I did an
> implementation analysis. The gist is that, if self and cls were made
> special variables that returned the current instance and class
> respectively, then the compiler could determine whether a function was
> an instance or class method. If it then marked the code object
> appropriately you could get rid of all of the wrappers and the
> attendant run-time overhead.

I don't see how you could get rid of the wrappers.  Methods would
still need to be bound, somehow, so that code like this will work:

methods = {}
for obj in objs:
    if obj.is_flagged:
        methods[obj.user_id] = obj.do_work
    else:
        methods[obj.user_id] = obj.do_other_work
# ...
methods[some_user_id]()

Without method wrappers, how does the interpreter figure out which
instance is bound to the method being called?

Cheers,
Ian


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep  1 10:57:39 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 01 Sep 2011 16:57:39 +0200
Subject: fun with nested loops
In-Reply-To: <a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
Message-ID: <j3o6h5$5ag$1@r03.glglgl.eu>

Am 01.09.2011 16:05 schrieb Daniel:

> In pseudocode it looks like this, I am using @ to give loops a name:
>
> @loop1
> for c in configurations:
>      @loop2
>      while not_done:
>          @loop3
>          while step1_did_not_work:
>              @loop4
>              for substeps in step1 # loop 4a
>                  if hopeless(): continue loop1 # run next configuration
>                  if substepsFailed(): restart loop4 # try again
>                  if substepsWorked(): break loop3 # go on to next
> steps, like loop4

let me have a try:

def loop(f):
     def wrapper(*a, **k):
         while True:
             try:
                 ret = f(*a, **k):
                 return ret
             except wrapper.restart:
                 continue # next try
             except wrapper.stop:
                 return None
             return ret
     wrapper.restart = type('restart', (Exception,), {})
     wrapper.stop = type('stop', (Exception,), {})
     return wrapper




@loop
def level1():
     for c in configurations:
         level2(c)

@loop
def level2():
     while not_done:
         level3()

@loop
def level3():
     while step1_did_not_work:
         level4()

@loop
def level4a():
     for substeps in step1
         if hopeless: raise level2.stop
         if substepsFailed: raise level4a.restart
         if substepsWorked: return ok


I don't know if I have the levels right, but that should be a way which 
works, without too many indentations.

Another approach could be a decorator which immediately runs the given 
functions, after adding the needed exception classes.


Thomas


From as at sci.fi  Thu Sep  1 11:25:30 2011
From: as at sci.fi (Anssi Saari)
Date: Thu, 01 Sep 2011 18:25:30 +0300
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <mailman.644.1314853527.27778.python-list@python.org>
Message-ID: <vg31uw0p9lg.fsf@coffee.modeemi.fi>

Sahil Tandon <sahil at FreeBSD.org> writes:

> I've been tasked with converting some programs from Perl -> Python, and
> am (as will soon be obvious) new to the language. 

If it's any help, I have usually done handling of standard input line by
line with this kind of thing:

for inputline in sys.stdin:


From mukeshtiwari.iiitm at gmail.com  Thu Sep  1 11:46:50 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Thu, 1 Sep 2011 08:46:50 -0700 (PDT)
Subject: Listing HAL devices
Message-ID: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>

Hello all
I am trying to write a python script which detects usb pen drive and
copy all the data into my home directory. After bit of searching , i
found these two links 1] http://en.wikibooks.org/wiki/Python_Programming/Dbus
and 2] http://stackoverflow.com/questions/469243/how-can-i-listen-for-usb-device-inserted-events-in-linux-in-python
. I just copied the wiki program but after running it , i got error

import dbus


class BusListener:
        def __init__( self ):
                self.bus = dbus.SystemBus()
                self.hal_obj =
self.bus.get_object('org.freedesktop.Hal' , '/org/freedesktop/Hal/
Manager' )
                print self.proxy



if __name__ == "__main__":
        obj = BusListener()

Traceback (most recent call last):
  File "Mount.py", line 13, in <module>
    obj = BusListener()
  File "Mount.py", line 7, in __init__
    self.hal_obj = self.bus.get_object('org.freedesktop.Hal' , '/org/
freedesktop/Hal/Manager' )
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 244, in
get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/pymodules/python2.7/dbus/proxies.py", line 241, in
__init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 183, in
activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 281, in
start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/pymodules/python2.7/dbus/connection.py", line 630, in
call_blocking
    message, timeout)
dbus.exceptions.DBusException:
org.freedesktop.DBus.Error.ServiceUnknown: The name
org.freedesktop.Hal was not provided by any .service files

Kindly some one please tell me why i am getting this error .
Thank you


From patentsvnc at gmail.com  Thu Sep  1 11:52:49 2011
From: patentsvnc at gmail.com (Den)
Date: Thu, 1 Sep 2011 08:52:49 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
Message-ID: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>

Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
is handled deep inside the OS, and I'm not trying to interrupt that.
But is there some way to detect that a C-A-D has been pressed?

Also, is there a corresponding key-sequence in Mac and Linux?  And how
might one detect those too?

Den


From mukeshtiwari.iiitm at gmail.com  Thu Sep  1 12:04:29 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Thu, 1 Sep 2011 09:04:29 -0700 (PDT)
Subject: Listing HAL devices
References: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>
Message-ID: <ed2c7683-17bd-480d-80ac-dc2a9fef2506@z1g2000prf.googlegroups.com>

On Sep 1, 8:46?pm, mukesh tiwari <mukeshtiwari.ii... at gmail.com> wrote:
> Hello all
> I am trying to write a python script which detects usb pen drive and
> copy all the data into my home directory. After bit of searching , i
> found these two links 1]http://en.wikibooks.org/wiki/Python_Programming/Dbus
> and 2]http://stackoverflow.com/questions/469243/how-can-i-listen-for-usb-de...
> . I just copied the wiki program but after running it , i got error
>
> import dbus
>
> class BusListener:
> ? ? ? ? def __init__( self ):
> ? ? ? ? ? ? ? ? self.bus = dbus.SystemBus()
> ? ? ? ? ? ? ? ? self.hal_obj =
> self.bus.get_object('org.freedesktop.Hal' , '/org/freedesktop/Hal/
> Manager' )
> ? ? ? ? ? ? ? ? print self.proxy
>
> if __name__ == "__main__":
> ? ? ? ? obj = BusListener()
>
> Traceback (most recent call last):
> ? File "Mount.py", line 13, in <module>
> ? ? obj = BusListener()
> ? File "Mount.py", line 7, in __init__
> ? ? self.hal_obj = self.bus.get_object('org.freedesktop.Hal' , '/org/
> freedesktop/Hal/Manager' )
> ? File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 244, in
> get_object
> ? ? follow_name_owner_changes=follow_name_owner_changes)
> ? File "/usr/lib/pymodules/python2.7/dbus/proxies.py", line 241, in
> __init__
> ? ? self._named_service = conn.activate_name_owner(bus_name)
> ? File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 183, in
> activate_name_owner
> ? ? self.start_service_by_name(bus_name)
> ? File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 281, in
> start_service_by_name
> ? ? 'su', (bus_name, flags)))
> ? File "/usr/lib/pymodules/python2.7/dbus/connection.py", line 630, in
> call_blocking
> ? ? message, timeout)
> dbus.exceptions.DBusException:
> org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.Hal was not provided by any .service files
>
> Kindly some one please tell me why i am getting this error .
> Thank you

I am using Ubuntu 11.04 .


From ansuman.python at gmail.com  Thu Sep  1 12:46:52 2011
From: ansuman.python at gmail.com (Ansuman Bebarta)
Date: Thu, 1 Sep 2011 09:46:52 -0700 (PDT)
Subject: Microphone Input
Message-ID: <3a8e8ad0-5ff8-4236-88b6-73be500e1ad3@p25g2000pri.googlegroups.com>

I want to have a microphone input in a python program on cross
platform. I don't want to use any third party module rather I want to
have a module of my own. Please guide me in this direction.


From ian.g.kelly at gmail.com  Thu Sep  1 13:19:33 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 11:19:33 -0600
Subject: Listing HAL devices
In-Reply-To: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>
References: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>
Message-ID: <CALwzidk1Cg2Dn5XHgSeG3HE27DOF+cX1pv48dco_txbPEd6uNw@mail.gmail.com>

On Thu, Sep 1, 2011 at 9:46 AM, mukesh tiwari
<mukeshtiwari.iiitm at gmail.com> wrote:
> dbus.exceptions.DBusException:
> org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.Hal was not provided by any .service files
>
> Kindly some one please tell me why i am getting this error .
> Thank you

It looks like you don't have HAL installed.  In any case, this is a
Ubuntu / DBus issue, not really a Python issue, so you might find
better support at those fora.

By the way, HAL is deprecated.  I believe current best practice is to
interface with udev directly, but I don't know exactly what that
entails.


From james.thornton at gmail.com  Thu Sep  1 13:58:54 2011
From: james.thornton at gmail.com (JT)
Date: Thu, 1 Sep 2011 10:58:54 -0700 (PDT)
Subject: Help parsing a text file
In-Reply-To: <j3glai$1mu$1@dont-email.me>
References: <j3glai$1mu$1@dont-email.me>
Message-ID: <015c1b3a-947f-4e11-8b1b-6f4ae52c31fd@glegroupsg2000goo.googlegroups.com>

On Monday, August 29, 2011 1:21:48 PM UTC-5, William Gill wrote:
> 
> I have a text file with XML like records that I need to parse.  By XML 
> like I mean records have proper opening and closing tags. but fields 
> don't have closing tags (they rely on line ends).  Not all fields appear 
> in all records, but they do adhere to a defined sequence.

lxml can parse XML and broken HTML (see http://lxml.de/parsing.html).

- James

-- 
Bulbflow: A Python framework for graph databases (http://bulbflow.com)


From nospam at domain.invalid  Thu Sep  1 14:38:09 2011
From: nospam at domain.invalid (William Gill)
Date: Thu, 01 Sep 2011 14:38:09 -0400
Subject: Help parsing a text file
In-Reply-To: <015c1b3a-947f-4e11-8b1b-6f4ae52c31fd@glegroupsg2000goo.googlegroups.com>
References: <j3glai$1mu$1@dont-email.me>
	<015c1b3a-947f-4e11-8b1b-6f4ae52c31fd@glegroupsg2000goo.googlegroups.com>
Message-ID: <j3ojeg$164$1@dont-email.me>

On 9/1/2011 1:58 PM, JT wrote:
> On Monday, August 29, 2011 1:21:48 PM UTC-5, William Gill wrote:
>>
>> I have a text file with XML like records that I need to parse.  By XML
>> like I mean records have proper opening and closing tags. but fields
>> don't have closing tags (they rely on line ends).  Not all fields appear
>> in all records, but they do adhere to a defined sequence.
>
> lxml can parse XML and broken HTML (see http://lxml.de/parsing.html).
>
> - James
>
Thanks to everyone.

Though I didn't get what I expected, it made me think more about the 
reason I need to parse these files to begin with.  So I'm going to do 
some more homework on the overall business application and work backward 
from there. Once I know how the data fits in the scheme of things, I 
will create an appropriate abstraction layer, either from scratch, or 
using one of the existing parsers mentioned, but I won't really know 
that until I have finished modeling.






From tjreedy at udel.edu  Thu Sep  1 14:40:28 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 14:40:28 -0400
Subject: fun with nested loops
In-Reply-To: <a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
Message-ID: <j3ojka$l2h$1@dough.gmane.org>

On 9/1/2011 10:05 AM, Daniel wrote:

You seems to be requesting one of the options in
http://python.org/dev/peps/pep-3136/ Labeled break and continue
(The 'Other languages' section omits Fortran.)

The rejection post is at
http://mail.python.org/pipermail/python-3000/2007-July/008663.html
I basically agree with it.

Your use case seems to be valid, extreme, and rare. You would probably 
use the proposed feature responsibly. But you are not everyone. I am not 
sure what Python-solution I would recommend. I might just stick with 
whatever you are doing that works for your group. However, I can also 
understand the desire to improve.

-- 
Terry Jan Reedy



From pavlovevidence at gmail.com  Thu Sep  1 15:02:45 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 1 Sep 2011 12:02:45 -0700 (PDT)
Subject: fun with nested loops
In-Reply-To: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
Message-ID: <7f43d4ad-fbd7-45f0-bcf5-719e19813429@glegroupsg2000goo.googlegroups.com>

On Wednesday, August 31, 2011 8:51:45 AM UTC-7, Daniel wrote:
> Dear All,
> 
> I have some complicated loops of the following form
> 
> for c in configurations: # loop 1
>     while nothing_bad_happened: # loop 2
>         while step1_did_not_work: # loop 3
>             for substeps in step1 # loop 4a
>                 # at this point, we may have to
>                 -leave loop 1
>                 -restart loop 4
>                 -skip a step in loop 4
>                 -continue on to loop 4b
> 
>         while step2_did_not_work: # loop 4b
>             for substeps in step2:
>                 # at this point, we may have to
>                 -leave loop 1
>                 -restart loop 2
>                 -restart loop 4b
>                 ...
>         ...many more loops...
> 
> 
> I don't see any way to reduce these nested loops logically, they
> describe pretty well what the software has to do.
> This is a data acquisition application, so on ever line there is
> a lot of IO that might fail or make subsequent steps useless or
> require a
> retry.
> 
> Now every step could need to break out of any of the enclosing loops.


I feel your pain.  Every language, even Python, has cases where the trade-offs made in the language design make some legitimate task very difficult.  In such cases I typically throw out the guidebook and make use of whatever shameless Perlesque thing it takes to keep things manageable.

In your example you seem like you're trying to maintain some semblance of structure and good habit; I'd it's probably no longer worth it.  Just store the level to break to in a variable, and after every loop check the variable and break if you need to break further.  Something like this, for example:

break_level = 99
while loop1:
    while loop2:
        while loop3:
            if some_condition:
                break_level = (1, 2, or 3)
                break
        if break_level < 3: break
        break_level = 99
    if break_level < 2: break
    break_level = 99


Carl Banks


From woooee at gmail.com  Thu Sep  1 15:17:37 2011
From: woooee at gmail.com (woooee)
Date: Thu, 1 Sep 2011 12:17:37 -0700 (PDT)
Subject: Text file with mixed end-of-line terminations
References: <4e5e8d71$0$2554$e4fe514c@news2.news.xs4all.nl>
Message-ID: <93d72f06-2e4d-4857-9d9a-f21473ef3267@x11g2000prb.googlegroups.com>

You can use f.read() to read the entire file's contents into a string,
providing the file isn't huge.  Then, split on "\r" and replace "\n"
when found.
A simple test:
input_data = "abc\rdef\rghi\r\njkl\r\nmno\r\n"
first_split = input_data.split("\r")
for rec in first_split:
    rec = rec.replace("\n", "")
    print rec


From aaron.hildebrandt at gmail.com  Thu Sep  1 15:54:02 2011
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Thu, 1 Sep 2011 12:54:02 -0700 (PDT)
Subject: OSX application built with py2app can't see bundled PySide module?
Message-ID: <2e0b44ea-0d71-4c30-8efe-6582cf6923bd@glegroupsg2000goo.googlegroups.com>

I'm trying to deploy a Python app on OSX that was built with PySide. py2app packages it without issue, copying and linking a lot of PySide and Qt files in the process. But then, when I try to run the built app, I get this error:

Traceback (most recent call last):
  File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 31, in <module>
    _run('dailies_v02.py')
  File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 28, in _run
    execfile(path, globals(), globals())
  File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/dailies_v02.py", line 9, in <module>
from PySide.QtCore import *
  File "PySide/__init__.pyc", line 2, in <module>
  File "PySide/private.pyc", line 2, in <module>
  File "PySide/QtCore.pyc", line 18, in <module>
  File "PySide/QtCore.pyc", line 15, in __load
ImportError: '/usr/lib/python2.6/lib-dynload/PySide/QtCore.so' not found

The weird thing is, QtCore.so IS included in the application bundle: py2app copied it to the build under Contents/Resources/lib/python2.6/lib-dynload/PySide/. Is there a reason the application isn't seeing this?


From false at pp.jaring.my  Thu Sep  1 17:12:44 2011
From: false at pp.jaring.my (Fulvio)
Date: Fri, 02 Sep 2011 05:12:44 +0800
Subject: Optparse buggy?
Message-ID: <j3osg8$fq8$1@speranza.aioe.org>

Hello,

I'm on python3.2, trying some experiment with OptionParser but no success

>>> from optparse import OptionParser as parser
>>> parser.add_option('-n','--new', dest='new')                                                                                             
Traceback (most recent call last):                                                                                                          
  File "<stdin>", line 1, in <module>                                                                                                       
  File "/usr/lib/python3.2/optparse.py", line 1001, in add_option                                                                           
    option = self.option_class(*args, **kwargs)                                                                                             
AttributeError: 'str' object has no attribute 'option_class'                                                                                
>>>                                                                                                                                     

Any futher item in the option won't make any better.
-- 
Archlinux on $(uname -a) :P



From mydevgroup at gmail.com  Thu Sep  1 17:14:23 2011
From: mydevgroup at gmail.com (George)
Date: Thu, 01 Sep 2011 22:14:23 +0100
Subject: Python thread
Message-ID: <CA85B43F.874C%mydevgroup@gmail.com>

Hi,
Why doesn't python threads show an associated PID?  On spawning python
threads using the threading module I can only see the main thread's pid on
using top or ps unix command, no  subprocesses are displayed. In otherwords
top or ps in not aware of any subprocesses created using threading module in
python. 

Whereas in Java , creating threads will result in separate pid , these
subprocesses can be listed using top or ps. Java threads get mapped to the
cores in the system.
  
Does it mean that python threads are not mapped to the core in the system.
On using multiprocessing module, separate processes are created with unique
PID. 


Any input would be great
George




From ian.g.kelly at gmail.com  Thu Sep  1 17:24:33 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 15:24:33 -0600
Subject: Optparse buggy?
In-Reply-To: <j3osg8$fq8$1@speranza.aioe.org>
References: <j3osg8$fq8$1@speranza.aioe.org>
Message-ID: <CALwzidngyoYVLMg94VJpjPMWx8GmMOEjwSFSQ2tZ5J47tuVecg@mail.gmail.com>

On Thu, Sep 1, 2011 at 3:12 PM, Fulvio <false at pp.jaring.my> wrote:
> Hello,
>
> I'm on python3.2, trying some experiment with OptionParser but no success
>
>>>> from optparse import OptionParser as parser
>>>> parser.add_option('-n','--new', dest='new')
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "/usr/lib/python3.2/optparse.py", line 1001, in add_option
> ? ?option = self.option_class(*args, **kwargs)
> AttributeError: 'str' object has no attribute 'option_class'
>>>>
>
> Any futher item in the option won't make any better.

You're trying to call the method from the OptionParser class -- you
need to instantiate it first.

from optparse import OptionParser
parser = OptionParser()
parser.add_option('-n', '--new', dest='new')
...

Cheers,
Ian


From jason.swails at gmail.com  Thu Sep  1 17:27:25 2011
From: jason.swails at gmail.com (Jason Swails)
Date: Thu, 1 Sep 2011 17:27:25 -0400
Subject: Optparse buggy?
In-Reply-To: <j3osg8$fq8$1@speranza.aioe.org>
References: <j3osg8$fq8$1@speranza.aioe.org>
Message-ID: <CAEk9e3q-OD5Rog-wkoAOsm7o7=iLwR7ALTKd4ZqyVUL72=g7DQ@mail.gmail.com>

On Thu, Sep 1, 2011 at 5:12 PM, Fulvio <false at pp.jaring.my> wrote:

> Hello,
>
> I'm on python3.2, trying some experiment with OptionParser but no success
>
> >>> from optparse import OptionParser as parser
> >>> parser.add_option('-n','--new', dest='new')
>

Here you've imported parser as an alias to the OptionParser class.  You can
only use add_option() on an instance of that class.  Try this:

from optparse import OptionParser

parser = OptionParser()
parser.add_option('-n','--new',dest='new')

However, I think argparse has replaced optparse since Python 2.7 and
higher...

HTH,
Jason
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From mydevgroup at gmail.com  Thu Sep  1 17:41:13 2011
From: mydevgroup at gmail.com (George)
Date: Thu, 01 Sep 2011 22:41:13 +0100
Subject: PythonThreading
Message-ID: <CA85BA89.88B9%mydevgroup@gmail.com>

Hi,
Why doesn't python threads show an associated PID?  On spawning python
threads using the threading module I can only see the main thread's pid on
using top or ps unix command, no  subprocesses are displayed. In otherwords
top or ps in not aware of any subprocesses created using threading module in
python.

Whereas in Java , creating threads will result in separate pid , these
subprocesses can be listed using top or ps. Java threads get mapped to the
cores in the system.

Does it mean that python threads are not mapped to the core in the system.
On using multiprocessing module, separate processes are created with unique
PID.


Any input would be great
George




From mydevgroup at gmail.com  Thu Sep  1 17:45:11 2011
From: mydevgroup at gmail.com (George Kovoor)
Date: Thu, 1 Sep 2011 22:45:11 +0100
Subject: Threads in Python
Message-ID: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>

Hi,
Why doesn't python threads show an associated PID?  On spawning python
threads using the threading module I can only see the main thread's pid on
using top or ps unix command, no  subprocesses are displayed. In otherwords
top or ps in not aware of any subprocesses created using threading module in
python.

Whereas in Java , creating threads will result in separate pid , these
subprocesses can be listed using top or ps. Java threads get mapped to the
cores in the system.

Does it mean that python threads are not mapped to the core in the system.
On using multiprocessing module, separate processes are created with unique
PID.


Any input would be great
George
-------------- next part --------------
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From tjreedy at udel.edu  Thu Sep  1 17:51:32 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 17:51:32 -0400
Subject: Optparse buggy?
In-Reply-To: <j3osg8$fq8$1@speranza.aioe.org>
References: <j3osg8$fq8$1@speranza.aioe.org>
Message-ID: <j3ouqi$2t3$1@dough.gmane.org>

On 9/1/2011 5:12 PM, Fulvio wrote:

> I'm on python3.2, trying some experiment with OptionParser but no success

Do note "The optparse module is deprecated and will not be developed 
further; development will continue with the argparse module."

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Thu Sep  1 17:54:37 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 17:54:37 -0400
Subject: Python thread
In-Reply-To: <CA85B43F.874C%mydevgroup@gmail.com>
References: <CA85B43F.874C%mydevgroup@gmail.com>
Message-ID: <j3ov0b$40l$1@dough.gmane.org>

On 9/1/2011 5:14 PM, George wrote:
> Hi,
> Why doesn't python threads show an associated PID?  On spawning python
> threads using the threading module I can only see the main thread's pid on
> using top or ps unix command, no  subprocesses are displayed. In otherwords
> top or ps in not aware of any subprocesses created using threading module in
> python.

Perhaps because threads are not subprocesses?

> Whereas in Java , creating threads will result in separate pid , these
> subprocesses can be listed using top or ps. Java threads get mapped to the
> cores in the system.
>
> Does it mean that python threads are not mapped to the core in the system.

They all run on the same core.

> On using multiprocessing module, separate processes are created with unique
> PID.

That is why multiprocessing was added.


-- 
Terry Jan Reedy



From mydevgroup at gmail.com  Thu Sep  1 18:08:01 2011
From: mydevgroup at gmail.com (George)
Date: Thu, 01 Sep 2011 23:08:01 +0100
Subject: Python thread
In-Reply-To: <j3ov0b$40l$1@dough.gmane.org>
Message-ID: <CA85C0D1.88C3%mydevgroup@gmail.com>

So what exactly does threading module do, if it doesn't create a subprocess.
Does each thread have its own stack and PC.
What advantage would a threading module provide over sequential execution.


On 01/09/2011 22:54, "Terry Reedy" <tjreedy at udel.edu> wrote:

> On 9/1/2011 5:14 PM, George wrote:
>> Hi,
>> Why doesn't python threads show an associated PID?  On spawning python
>> threads using the threading module I can only see the main thread's pid on
>> using top or ps unix command, no  subprocesses are displayed. In otherwords
>> top or ps in not aware of any subprocesses created using threading module in
>> python.
> 
> Perhaps because threads are not subprocesses?
> 
>> Whereas in Java , creating threads will result in separate pid , these
>> subprocesses can be listed using top or ps. Java threads get mapped to the
>> cores in the system.
>> 
>> Does it mean that python threads are not mapped to the core in the system.
> 
> They all run on the same core.
> 
>> On using multiprocessing module, separate processes are created with unique
>> PID.
> 
> That is why multiprocessing was added.
> 




From ramit.prasad at jpmorgan.com  Thu Sep  1 18:21:37 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 1 Sep 2011 18:21:37 -0400
Subject: Python thread
In-Reply-To: <CA85C0D1.88C3%mydevgroup@gmail.com>
References: <j3ov0b$40l$1@dough.gmane.org> <CA85C0D1.88C3%mydevgroup@gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>

>So what exactly does threading module do, if it doesn't create a subprocess.
>Does each thread have its own stack and PC.
>What advantage would a threading module provide over sequential execution.

I believe it merely simulates multiple processes through scheduling (like the CPU).

From http://docs.python.org/library/threading.html: CPython implementation detail: Due to the Global Interpreter Lock, in CPython only one thread can execute Python code at once (even though certain performance-oriented libraries might overcome this limitation). If you want your application to make better of use of the computational resources of multi-core machines, you are advised to use multiprocessing. However, threading is still an appropriate model if you want to run multiple I/O-bound tasks simultaneously.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423




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confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From me+list/python at ixokai.io  Thu Sep  1 18:27:32 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Thu, 01 Sep 2011 15:27:32 -0700
Subject: Threads in Python
In-Reply-To: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>
References: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>
Message-ID: <4E6006D4.9080106@ixokai.io>

On 9/1/11 2:45 PM, George Kovoor wrote:
> Hi,
> Why doesn't python threads show an associated PID?  On spawning python
> threads using the threading module I can only see the main thread's pid on
> using top or ps unix command, no  subprocesses are displayed. In otherwords
> top or ps in not aware of any subprocesses created using threading module in
> python.
>
> Whereas in Java , creating threads will result in separate pid , these
> subprocesses can be listed using top or ps. Java threads get mapped to the
> cores in the system.

I think you're confused about what threads and subprocesses are. They
are completely different mechanisms for concurrent code. Threads never
show up on top or ps, in any language ... or the language isn't offering
threads. I don't know Java, so I can't really comment on it much, but it
may be misusing the 'thread' word, but I somehow doubt it. I suspect
you're just mistaken about what Java is offering.

Threads are separate operating ..er, chains-of-instructions within a
single process... Notably with threads, they share the same address
space so you can easily share objects amongst threads, without any
copying and with no overhead ... Also notably with threads, this can be
dangerous, so you often end up wrapping lots of locks around those
shared objects and have to take extreme care to make sure nothing goes
haywire.

Subprocesses are different; they are a whole, separate process with its
own address space and no shared memory (unless you go out of your way to
do it manually). Heck, each subprocess can have any number of threads.
Anything you want to share between them you have to take special care to
set up and do -- multiprocessing exists to make this easier and make
subprocesses easier to use, like threads are.

They're very distinct. Threads are a lot more lightweight and start up a
lot faster, but doing multithreaded programming right with any sort of
shared objects is really, really, really hard to get right. Some say you
can't.

But, in Python, only one thread actually ever executes actual Python
code at any given time. This does not actually make threading useless as
some people claim; if you're making a lot of calls into C-code, for
instance, the lock gets released while said C-code runs and other Python
code can continue along. Its just not useful if your program is
CPU-bound and wants to take advantage of multiple cores. But there's
lots of other reasons to go concurrent.

But if you do need lots of CPU power, multiprocessing lets you chew up
multiple cores and does so /fairly/ easily. Communication between the
processes can be expensive depending on the types of objects you need to
pass back and forth, but it depends on how you're designing your app.

They're just different ways of achieving concurrency, and the two
primary ways Python provides. (Greenlets is another, available as a
third-party module; Twisted's asynch dispatching isn't really exactly
concurrency, but it does a better job then concurrency does for some
operations; someone's always working on coroutines in some fashion or
another, which is another kind of concurrency.)

Lots of different ways to go concurrent, depending on your needs.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

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From cs at zip.com.au  Thu Sep  1 18:43:01 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 2 Sep 2011 08:43:01 +1000
Subject: Threads in Python
In-Reply-To: <4E6006D4.9080106@ixokai.io>
References: <4E6006D4.9080106@ixokai.io>
Message-ID: <20110901224301.GA8878@cskk.homeip.net>

On 01Sep2011 15:27, Stephen Hansen <me+list/python at ixokai.io> wrote:
| On 9/1/11 2:45 PM, George Kovoor wrote:
| > Why doesn't python threads show an associated PID?  On spawning python
| > threads using the threading module I can only see the main thread's pid on
| > using top or ps unix command, no  subprocesses are displayed. In otherwords
| > top or ps in not aware of any subprocesses created using threading module in
| > python.
| >
| > Whereas in Java , creating threads will result in separate pid , these
| > subprocesses can be listed using top or ps. Java threads get mapped to the
| > cores in the system.
| 
| I think you're confused about what threads and subprocesses are. They
| are completely different mechanisms for concurrent code. Threads never
| show up on top or ps, in any language ... or the language isn't offering
| threads. I don't know Java, so I can't really comment on it much, but it
| may be misusing the 'thread' word, but I somehow doubt it. I suspect
| you're just mistaken about what Java is offering.

No, you're mistaken about the threading models on offer.

Some systems offer a threading model where threads can have distinct
process ids; the only real criterion is that they share the same address
space.

The advantages of separate process ids for threads include letting
the OS arrange their scheduling, delivery of signals (on UNIX systems)
to a particular thread, ability to use multiple cores. On the flipside,
threads with distinct process ids tend to be more expensive to set up
and may be more expensive in thread switching.

Java has long shipped with multiple threading implementations; IIRC
"green threads" is an "all in one process id" model that can be used on
any platform.

Some use a mix of heavyweight (threads with distinct pids) and
lightweight threads.

| But, in Python, only one thread actually ever executes actual Python
| code at any given time.

In CPython this is true. Other implementations like Jython can use
other threading models; I'd expect Jython to take a lot of advantage of
Java's native threads.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Seeing my great fault
Through darkening blue windows
I begin again
- Haiku Error Messages http://www.salonmagazine.com/21st/chal/1998/02/10chal2.html


From benjamin.kaplan at case.edu  Thu Sep  1 18:46:32 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 1 Sep 2011 18:46:32 -0400
Subject: Python thread
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>
References: <j3ov0b$40l$1@dough.gmane.org> <CA85C0D1.88C3%mydevgroup@gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAMuTYXgQy1qZrJxRywkvPMxwCHXWnLLmBKNbm+=E2je-NKwAFA@mail.gmail.com>

On Thu, Sep 1, 2011 at 6:21 PM, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>So what exactly does threading module do, if it doesn't create a subprocess.
>>Does each thread have its own stack and PC.
>>What advantage would a threading module provide over sequential execution.
>
> I believe it merely simulates multiple processes through scheduling (like the CPU).
>
> >From http://docs.python.org/library/threading.html: CPython implementation detail: Due to the Global Interpreter Lock, in CPython only one thread can execute Python code at once (even though certain performance-oriented libraries might overcome this limitation). If you want your application to make better of use of the computational resources of multi-core machines, you are advised to use multiprocessing. However, threading is still an appropriate model if you want to run multiple I/O-bound tasks simultaneously.
>
> Ramit

Threading is an OS-level construct to allow concurrency within a
single process (and address space). Threads are never supposed to be
separate processes (they aren't at the C-level, so I don't know what
Java is doing here). CPython code has a global interpreter lock which
prevents two threads from running Python code at the same time, but
they're still useful for asynchronous operations. For example, one
thread can be waiting for user input while another thread continues to
process data. Other Python implementations such as Jython and
IronPython don't have a global interpreter lock so threads can run
concurrently (and on different cores in a multi-core machine).

> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
>
>
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available at http://www.jpmorgan.com/pages/disclosures/email.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tjreedy at udel.edu  Thu Sep  1 19:02:17 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 19:02:17 -0400
Subject: Python thread
In-Reply-To: <CA85C0D1.88C3%mydevgroup@gmail.com>
References: <j3ov0b$40l$1@dough.gmane.org> <CA85C0D1.88C3%mydevgroup@gmail.com>
Message-ID: <j3p2v7$qiq$1@dough.gmane.org>

On 9/1/2011 6:08 PM, George wrote:
> So what exactly does threading module do, if it doesn't create a subprocess.
> Does each thread have its own stack and PC.
> What advantage would a threading module provide over sequential execution.

https://secure.wikimedia.org/wikipedia/en/wiki/Thread_%28computer_science%29

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Thu Sep  1 19:06:16 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 19:06:16 -0400
Subject: PythonThreading
In-Reply-To: <CA85BA89.88B9%mydevgroup@gmail.com>
References: <CA85BA89.88B9%mydevgroup@gmail.com>
Message-ID: <j3p36m$qiq$2@dough.gmane.org>

Please do not repeatedly post the same thing. Doing so, with different 
titles, will only annoy people. It takes awhile for a post to show up 
with whatever news or mail reader you are using.

-- 
Terry Jan Reedy



From lists at cheimes.de  Thu Sep  1 19:09:51 2011
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 02 Sep 2011 01:09:51 +0200
Subject: Python thread
In-Reply-To: <CAMuTYXgQy1qZrJxRywkvPMxwCHXWnLLmBKNbm+=E2je-NKwAFA@mail.gmail.com>
References: <j3ov0b$40l$1@dough.gmane.org>
	<CA85C0D1.88C3%mydevgroup@gmail.com>	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>
	<CAMuTYXgQy1qZrJxRywkvPMxwCHXWnLLmBKNbm+=E2je-NKwAFA@mail.gmail.com>
Message-ID: <j3p3bv$tbs$1@dough.gmane.org>

Am 02.09.2011 00:46, schrieb Benjamin Kaplan:
> Threading is an OS-level construct to allow concurrency within a
> single process (and address space). Threads are never supposed to be
> separate processes (they aren't at the C-level, so I don't know what
> Java is doing here). CPython code has a global interpreter lock which
> prevents two threads from running Python code at the same time, but
> they're still useful for asynchronous operations. For example, one
> thread can be waiting for user input while another thread continues to
> process data. Other Python implementations such as Jython and
> IronPython don't have a global interpreter lock so threads can run
> concurrently (and on different cores in a multi-core machine).

On Linux threading is implemented with multiple processes. A Linux
pthread is a clone of the process created with the clone(2) syscall. [1]
Each thread has a PID and an entry in the kernel's process table. Tools
like htop can show user land threads as different processes. This may
explain the confusion of the OP. He may have seen multiple Java threads
as different processes.

psutil can list all threads with PIDs. The getpid(2) syscall returns
always the PID of the main process, gettid (only available through
syscall(SYS_gettid)) returns the PID of the current thread.

Christian

[1] http://linux.die.net/man/2/clone



From nobody at nowhere.com  Thu Sep  1 20:10:14 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 02 Sep 2011 01:10:14 +0100
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <pan.2011.09.02.00.10.14.153000@nowhere.com>

On Thu, 01 Sep 2011 08:52:49 -0700, Den wrote:

> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?

Not reliably. You might infer that Ctrl-Alt-Del has been used by the way
that certain operations behave, but that's fairly error-prone.

> Also, is there a corresponding key-sequence in Mac and Linux?  And how
> might one detect those too?

I don't know about Mac. Linux has some support for Ctrl-Alt-Del on the
console, and the optional "Magic SysRq" feature. But there's no easy way
to detect these (if the sequence is recognised by the kernel, it's not
reported by the usual mechanisms).



From dalist0 at gmail.com  Thu Sep  1 20:21:33 2011
From: dalist0 at gmail.com (Daniel)
Date: Thu, 1 Sep 2011 17:21:33 -0700 (PDT)
Subject: fun with nested loops
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<7f43d4ad-fbd7-45f0-bcf5-719e19813429@glegroupsg2000goo.googlegroups.com>
Message-ID: <e04c74e8-d4cb-4aeb-9d2c-8cccd785ebcf@g9g2000yqb.googlegroups.com>

I thought a bit about Carl's and Thomas' proposals, and it gave me an
idea how this problem could be approached:
Break is relatively easy to implement with a context manager that
returns an iterable that throws an exception specific to that context
manager:

with named_loop(i for i in range(10)) as loop1:
    for i in loop1:
        with named_loop(i for i in range(10)) as loop2a:
            for j in loop2a:
                loop1._break() # this is easy
                loop1._continue() # this is difficult
                # if we _continue here, we need to do a continue right
after the with loop2a:
        if loop1.cont: continue # context manager does not create new
scope

        with named_loop(i for i in range(10)) as loop2b:
            for j in loop2b:
                loop1._break()

this throws an exception that propagates through all the context
managers till it hits the one that made loop1
at that point the exception is caught.

Now using the idea of break_levels, something like loop1._continue()
should work.
It is more difficult, because it should be caught in the last loop
before the one that is targeted,
loop1._continue throws an exception that is caught in loop2. Then
loop1 just continues with the next value.

I don't know how loop2 can learn that it is enclosed in loop1. Maybe
loop1 could add itself to a global stack on enter
and delete itself on exit, or maybe inspect could help?

The big problem is that loop1._continue breaks out of loop2a, but then
starts to execute loop2b, which we don't want.
If loop1 is _continued inside of loop2a, a continue needs to directly
follow the loop2a with block.

An alternative would be to wrap each sequence of statements in another
with statement, I think this is better:

for i in loop1:
    with sequenced_stuff():
        with named_loop(i for i in range(10)) as loop2a:
            for j in loop2a:
                loop1._continue() # this is caught in
sequenced_stuff()

        with named_loop(i for i in range(10)) as loop2b:
            for j in loop2b:
                loop1._break()


Loops can even be restarted with a small modification:
In a loop like "for i in loop1:" the __iter__ method of loop1 is
called. If __iter__ returns a smart iterator that keeps a reference to
loop1, then it can be restarted, advanced etc.
loop1.restart() would throw an exception that __exits__ all the inner
loops and gets caught in the loop just before loop1. Then it resets
the iterable that the iterator returned by __iter__ links to, i.e.
loop1 restarts.
Nice side benefit: loops can have a method peek(n) to look ahead.

Thanks for all your input,

Dan





From bkasterm at gmail.com  Thu Sep  1 20:35:10 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Thu, 01 Sep 2011 18:35:10 -0600
Subject: List comprehension timing difference.
Message-ID: <87zkinkcht.fsf@gmail.com>


In the following code I create the graph with vertices
sgb-words.txt (the file of 5 letter words from the
stanford graphbase), and an edge if two words differ 
by one letter.  The two methods I wrote seem to me to 
likely perform the same computations, the list comprehension 
is faster though (281 seconds VS 305 seconds on my dell mini).

Is the right interpretation of this timing difference
that the comprehension is performed in the lower level
C code?

As this time I have no other conjecture about the cause.

---------------------------------------------------------
import time
import copy

data = map (lambda x: x.strip(), open('sgb-words.txt').readlines())

def d (w1, w2):
    count = 0
    for idx in range(0,5):
        if w1[idx] != w2[idx]:
            count += 1
    return count

print "creating graph"
t0 = time.clock ()
graph = [[a,b] for a in data for b in data if d(a,b) ==1 and a < b]
t1 = time.clock ()
print "took " + str (t1 - t0) + " seconds."

t0 = time.clock ()
graph2 = []
for i in range (0, len(data)):
    for j in range(0,len(data)):
        if d(data[i],data[j]) == 1 and i < j:
            graph2.append ([i,j])
t1 = time.clock ()
print "took " + str (t1 - t0) + " seconds."


From steve+comp.lang.python at pearwood.info  Thu Sep  1 21:04:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 02 Sep 2011 11:04:01 +1000
Subject: fun with nested loops
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
Message-ID: <4e602b81$0$29985$c3e8da3$5496439d@news.astraweb.com>

Daniel wrote:

> That's the form the specification is in, and it makes sense and is
> very readable.
> In pseudocode it looks like this, I am using @ to give loops a name:
> 
> @loop1
> for c in configurations:
>     @loop2
>     while not_done:
>         @loop3
>         while step1_did_not_work:
>             @loop4
>             for substeps in step1 # loop 4a
>                 if hopeless(): continue loop1 # run next configuration
>                 if substepsFailed(): restart loop4 # try again
>                 if substepsWorked(): break loop3 # go on to next
> steps, like loop4
> 
> That format is fine, everyone involved can understand it, even the
> people in charge.

Well good for them, because I sure as hell don't understand it. To me,
that's exactly the sort of thing that Guido was worried about when he
rejected the idea of named labels. I'd need to sit down and trace a few
loops by hand to grasp it. I wonder how new people coming into the project
find it?

Personally, I consider two nested loops right on the boundary of my "magic
number seven, plus or minus two" short term memory[1]. I prefer to chunk
code into functions so that I can ignore details of the inner loops while
reasoning about the outer loops, and vice versa. If you feel different,
then I'm not being sarcastic when I say "good for you".

If you require a 1:1 correspondence between your code and your pseudo-code
specification, then maybe Python isn't the right language for this task.

Ruby is very Python-like, and has labelled loops. Perl and PHP less so, but
can also be quite readable with some discipline. You could also check out
Cobra -- their website is down just at the moment, so I can't check whether
it has labelled loops.

http://cobra-language.com/



[1] Not really magic, and probably more like 4?2.


-- 
Steven



From python at mrabarnett.plus.com  Thu Sep  1 21:12:47 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 02 Sep 2011 02:12:47 +0100
Subject: List comprehension timing difference.
In-Reply-To: <87zkinkcht.fsf@gmail.com>
References: <87zkinkcht.fsf@gmail.com>
Message-ID: <4E602D8F.4090408@mrabarnett.plus.com>

On 02/09/2011 01:35, Bart Kastermans wrote:
>
> In the following code I create the graph with vertices
> sgb-words.txt (the file of 5 letter words from the
> stanford graphbase), and an edge if two words differ
> by one letter.  The two methods I wrote seem to me to
> likely perform the same computations, the list comprehension
> is faster though (281 seconds VS 305 seconds on my dell mini).
>
> Is the right interpretation of this timing difference
> that the comprehension is performed in the lower level
> C code?
>
> As this time I have no other conjecture about the cause.
>
> ---------------------------------------------------------
> import time
> import copy
>
> data = map (lambda x: x.strip(), open('sgb-words.txt').readlines())
>
> def d (w1, w2):
>      count = 0
>      for idx in range(0,5):
>          if w1[idx] != w2[idx]:
>              count += 1
>      return count
>
> print "creating graph"
> t0 = time.clock ()
> graph = [[a,b] for a in data for b in data if d(a,b) ==1 and a<  b]
> t1 = time.clock ()
> print "took " + str (t1 - t0) + " seconds."
>
> t0 = time.clock ()
> graph2 = []
> for i in range (0, len(data)):
>      for j in range(0,len(data)):
>          if d(data[i],data[j]) == 1 and i<  j:
>              graph2.append ([i,j])
> t1 = time.clock ()
> print "took " + str (t1 - t0) + " seconds."

Are they actually equivalent? Does graph == graph2?

The first version (list comprehension) creates a list of pairs of
values:

     [a, b]

whereas the second version (for loops) creates a list of pairs of
indexes:

     [i, j]

The second version has subscripting ("data[i]" and "data[j]"), which
will slow it down.


From rtomek at ceti.com.pl  Thu Sep  1 21:53:07 2011
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Fri, 2 Sep 2011 03:53:07 +0200 (CEST)
Subject: slightly OT -- LaTeX
In-Reply-To: <4E60379F.4000702@stoneleaf.us>
References: <4E60379F.4000702@stoneleaf.us>
Message-ID: <Pine.LNX.4.64.1109020349250.17864@tau.ceti.pl>

On Thu, 1 Sep 2011, Ethan Furman wrote:

> I asked a question a couple weeks ago about scripting WordPerfect with Python,
> and a couple respondents suggested LaTeX was very good.  Where would I start
> if I wanted to learn about it?
> 
> ~Ethan~

1. Leslie Lamport, "LaTeX: A Document Preparation System" - I have used 
it, learning LaTeX in front of a computer, as I wrote my first document in 
it. I guess this is a very good book on the subject but I have never tried 
anything else.

2. http://www.latex-project.org/
   http://www.latex-project.org/guides/
   http://www.ctan.org/

Regards,
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From ethan at stoneleaf.us  Thu Sep  1 21:55:43 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 01 Sep 2011 18:55:43 -0700
Subject: slightly OT -- LaTeX
Message-ID: <4E60379F.4000702@stoneleaf.us>

I asked a question a couple weeks ago about scripting WordPerfect with 
Python, and a couple respondents suggested LaTeX was very good.  Where 
would I start if I wanted to learn about it?

~Ethan~


From sahil at FreeBSD.org  Thu Sep  1 22:02:54 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Thu, 01 Sep 2011 22:02:54 -0400
Subject: idiomatic analogue of Perl's: while (<>) { ... }
In-Reply-To: <4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.644.1314853527.27778.python-list@python.org>
	<4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E60394E.2080708@FreeBSD.org>

[Thanks to everyone who responded]

Steven D'Aprano wrote:
> On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:
>> %%
>> # unbuffer STDOUT
>> sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
>
> I've never bothered with unbuffered stdout, but that looks fine to me.
>
> I'm not sure if it is necessary though, because print seems to automatically
> flush the buffer after each line in my testing. Unless you're printing
> repeatedly to the same line, I'm not sure unbuffered stdout is helpful.

I found it necessary because without reopening sys.stdout with buffering 
explicitly turned off, I would have to manually flush the buffer after 
each print.  This is because the program must reply (via writing to 
STDOUT) after parsing each line read via STDIN.  If I neither disable 
buffering nor manually flush after each print, the program just hangs 
instead of printing right away.

>> # process input, line-by-line, and print responses after parsing input
>> while 1:
>>    rval = parse(raw_input())
>>    if rval == None:
>>      print('foo')
>>    else:
>>      print('bar')
>> %%
>
> "while True" is considered slightly more idiomatic (readable), but
> otherwise, that seems fine.

Ah, thanks -- I've changed '1' to 'True'.

>> This works, but while reading the documentation, I thought of using 'for
>> line in fileinput.input()' in lieu of 'while 1:' construct.  This does
>> not work when debugging the program on the command line -- the script
>> appears to just hang no matter what is typed into STDIN.  I believe this
>> is because of some internal buffering when using fileinput.  Is there a
>> recommended way to disable such buffering?  Am I taking a totally wrong
>> approach?
>
> I'm not sure anything about fileinput is exactly *recommended*, it's kinda
> discouraged on account of being a bit slow. See help(fileinput) at the
> interactive prompt.
>
> For what it's worth, the default buffersize for fileinput.input is 0, so if
> that doesn't do what you want, I don't think fileinput is the right
> solution.

Got it.  Based on your and others' response, I will stick with my 
existing approach.

-- 
Sahil Tandon <sahil at FreeBSD.org>



From ben+python at benfinney.id.au  Thu Sep  1 22:11:23 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 02 Sep 2011 12:11:23 +1000
Subject: slightly OT -- LaTeX
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <8762lbsng4.fsf@benfinney.id.au>

Ethan Furman <ethan at stoneleaf.us> writes:

> I asked a question a couple weeks ago about scripting WordPerfect with
> Python, and a couple respondents suggested LaTeX was very good.

Someone (you, or the respondents, or some combination of those) has
omitted a few steps there, and what you've said here has become a non
sequitur: I can't see the path you've taken from ?scripting WordPerfect
with Python? to ?LaTeX?.

How does this relate to Python? (If it relates only to WordPerfect or
LaTeX, you're in the wrong forum, so I assume there must be some
particular relevance to Python.)

> Where would I start if I wanted to learn about it?

About LaTeX? <URL:http://www.latex-project.org/> seems the obvious
answer.

If you want something more specific, please be more specific with the
question.

-- 
 \          ?Now Maggie, I?ll be watching you too, in case God is busy |
  `\       creating tornadoes or not existing.? ?Homer, _The Simpsons_ |
_o__)                                                                  |
Ben Finney


From false at pp.jaring.my  Thu Sep  1 22:11:55 2011
From: false at pp.jaring.my (Fulvio)
Date: Fri, 02 Sep 2011 10:11:55 +0800
Subject: Optparse buggy?
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
Message-ID: <j3pe1q$o67$1@speranza.aioe.org>

Terry Reedy wrote:

> Do note "The optparse module is deprecated and will not be developed
> further; development will continue with the argparse module."

Then,do you propose me to opt to argparse?

-- 
Archlinux on $(uname -a) :P
F


From roy at panix.com  Thu Sep  1 22:16:13 2011
From: roy at panix.com (Roy Smith)
Date: Thu, 01 Sep 2011 22:16:13 -0400
Subject: Optparse buggy?
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
Message-ID: <roy-CFA28A.22161301092011@news.panix.com>

In article <mailman.666.1314913951.27778.python-list at python.org>,
 Terry Reedy <tjreedy at udel.edu> wrote:

> Do note "The optparse module is deprecated and will not be developed 
> further; development will continue with the argparse module."

One of the unfortunate things about optparse and argparse is the names.  
I can never remember which is the new one and which is the old one.  It 
would have been a lot simpler if the new one had been named optparse2 
(in the style of unittest2 and urllib2).


From ben+python at benfinney.id.au  Thu Sep  1 22:18:19 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 02 Sep 2011 12:18:19 +1000
Subject: Optparse buggy?
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
	<j3pe1q$o67$1@speranza.aioe.org>
Message-ID: <871uvzsn4k.fsf@benfinney.id.au>

Fulvio <false at pp.jaring.my> writes:

> Terry Reedy wrote:
>
> > Do note "The optparse module is deprecated and will not be developed
> > further; development will continue with the argparse module."
>
> Then,do you propose me to opt to argparse?

Without argument, yes; though for now it is opt-in.

-- 
 \     ?We are no more free to believe whatever we want about God than |
  `\         we are free to adopt unjustified beliefs about science or |
_o__)              history [?].? ?Sam Harris, _The End of Faith_, 2004 |
Ben Finney


From askutt at gmail.com  Thu Sep  1 22:25:22 2011
From: askutt at gmail.com (Adam Skutt)
Date: Thu, 1 Sep 2011 19:25:22 -0700 (PDT)
Subject: Python thread
References: <mailman.661.1314911668.27778.python-list@python.org>
Message-ID: <cdc08977-7dfc-4282-9792-072edd140853@q2g2000vbz.googlegroups.com>

On Sep 1, 5:14?pm, George <mydevgr... at gmail.com> wrote:
> Hi,
> Why doesn't python threads show an associated PID? ?On spawning python
> threads using the threading module I can only see the main thread's pid on
> using top or ps unix command, no ?subprocesses are displayed. In otherwords
> top or ps in not aware of any subprocesses created using threading module in
> python.

You probably need to run 'ps axm' or something similar to see to
threads associated with a processes on your system.

>
> Whereas in Java , creating threads will result in separate pid , these
> subprocesses can be listed using top or ps. Java threads get mapped to the
> cores in the system.

No.  It depends on your runtime, but if Java uses native threads, it
will have the same behavior as Python here. It also doesn't mean they
get mapped to cores in the system.  All it means is the operating
system is responsible for scheduling the threads and managing their
lifecycle.

Adam


From gagsl-py2 at yahoo.com.ar  Thu Sep  1 22:26:54 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 01 Sep 2011 23:26:54 -0300
Subject: Calling Script from Command line not working
References: <CADBb1sdSMyiEKSaxPgScE_sCobpcVkFjuEJP0iFJ_KJJPFnQGg@mail.gmail.com>
Message-ID: <op.v05s24u3x6zn5v@lepton>

En Mon, 29 Aug 2011 07:40:06 -0300, Sathish S <sathish at solitontech.com>  
escribi?:

> We created a DLL using cygwin and have written a class based python  
> module
> for the same. We have created a sample script for the class based python
> module, that creates an object of the class and calls various methods in  
> the
> class. This Test script works fine while I run it from IDLE. However  
> when I
> run it from command prompt it either hangs or just returns without  
> executing
> the functions. When it returns I do not get a error trace.
>
> When I tried to findout where exactly the issue is happening. the issue
> occurs when I try to call the *cygwin_dll_init* method of the  
> cygwin1.dll .
> This cygwin1.dll is actualy a dependency to the DLL we have built. So we
> have to load this DLL and call this *cygwin_dll_init* method before  
> loading
> my DLL.
>
>
> cyg = cdll.LoadLibrary("cygwin1.dll")
> cyg.cygwin_dll_init() #hangs or returns here
> mydll=cdll.LoadLibrary("my.dll")
>mydll.func1()
>I'm trying to understand what exactly is the difference, when we call it
> IDLE and when we call it from command prompt using the python command. I
> will have to get the script working from command prompt as well.

A few comments:

* why do you initialize cygwin1.dll in Python? If it's a dependency of  
my.dll, it might be better to load and initialize it there.

* for this function prototype: void cygwin_dll_init(void);
you should declare it using:

cyg = cdll.LoadLibrary("cygwin1.dll")
cyg.restype = None
cyg.cygwin_dll_init() #hangs or returns here
...

Anyway, I don't see why a console application would fail but not inside  
IDLE.

-- 
Gabriel Genellina



From askutt at gmail.com  Thu Sep  1 22:28:58 2011
From: askutt at gmail.com (Adam Skutt)
Date: Thu, 1 Sep 2011 19:28:58 -0700 (PDT)
Subject: Python thread
References: <CA85B43F.874C%mydevgroup@gmail.com>
	<mailman.667.1314914411.27778.python-list@python.org>
Message-ID: <ab42ae84-f1a1-47a6-a131-77b0812646b0@k29g2000yqf.googlegroups.com>

On Sep 1, 5:54?pm, Terry Reedy <tjre... at udel.edu> wrote:
> > Does it mean that python threads are not mapped to the core in the system.
>
> They all run on the same core.
>

No, CPython is a native thread implementation, so they'll be scheduled
however the kernel sees fit.  Only allowing one thread to run at a
time doesn't mean they'll always run on the same core.

Adam


From dan at tombstonezero.net  Thu Sep  1 22:32:17 2011
From: dan at tombstonezero.net (Dan Sommers)
Date: Fri, 2 Sep 2011 02:32:17 +0000 (UTC)
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <mailman.644.1314853527.27778.python-list@python.org>
	<4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.02.02.32.15@tombstonezero.net>

On Thu, 01 Sep 2011 16:02:54 +1000, Steven D'Aprano wrote:

> On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:

>> # process input, line-by-line, and print responses after parsing input
>> while 1:
>>   rval = parse(raw_input())
>>   if rval == None:
>>     print('foo')
>>   else:
>>     print('bar')
>> %%

> "while True" is considered slightly more idiomatic (readable), but
> otherwise, that seems fine.

Arguably more readable, but arguably less idomatic, is to describe the
actual condition that controls the loop in a string (non-empty strings
are equivalent to True in this context):

while "there is more input":
    rval = parse(raw_input())
    if real is None:
        print('foo')
    else:
        print('bar')

(Although now that I've said that, this looks like an infinite loop
unless parse, raw_input, or print raises an exception.)

Dan



From miki.tebeka at gmail.com  Fri Sep  2 00:01:56 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 1 Sep 2011 21:01:56 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <0d3e6227-9435-4103-b810-ae3b6e58c04f@glegroupsg2000goo.googlegroups.com>

I found http://tobi.oetiker.ch/lshort/lshort.pdf very useful.


From miki.tebeka at gmail.com  Fri Sep  2 00:01:56 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 1 Sep 2011 21:01:56 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <0d3e6227-9435-4103-b810-ae3b6e58c04f@glegroupsg2000goo.googlegroups.com>

I found http://tobi.oetiker.ch/lshort/lshort.pdf very useful.


From invalid at invalid.invalid  Fri Sep  2 00:32:48 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Fri, 2 Sep 2011 04:32:48 +0000 (UTC)
Subject: Threads in Python
References: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>
	<mailman.670.1314916069.27778.python-list@python.org>
Message-ID: <j3pm9g$t6g$1@reader1.panix.com>

On 2011-09-01, Stephen Hansen <me+list/python at ixokai.io> wrote:
> On 9/1/11 2:45 PM, George Kovoor wrote:

>> Why doesn't python threads show an associated PID?  On spawning
>> python threads using the threading module I can only see the main
>> thread's pid on using top or ps unix command, no subprocesses are
>> displayed. In otherwords top or ps in not aware of any subprocesses
>> created using threading module in python.

That's because threads are displayed by top/ps in most Linux systems.

>> Whereas in Java , creating threads will result in separate pid, these
>> subprocesses can be listed using top or ps. Java threads get mapped to the
>> cores in the system.

If that's on the same system, then those aren't threads.

> I think you're confused about what threads and subprocesses are. They
> are completely different mechanisms for concurrent code. Threads never
> show up on top or ps, in any language...

That depends on your threading model.  Some versions of Linux using
LinuxThreads rather than NPTL will show each thread in top or ps.

> or the language isn't offering threads.

The difference between threads and processes isn't whether they show
up in top or ps.  For many years threads showed up in top and ps. They
were still threads.  But, you're right that on most modern,
non-embedded, Linux systems threads don't show up in top or ps.

> I don't know Java, so I can't really comment on it much, but it may
> be misusing the 'thread' word, but I somehow doubt it. I suspect
> you're just mistaken about what Java is offering.

Sure sounds like it.

-- 
Grant


From cs at zip.com.au  Fri Sep  2 01:01:59 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 2 Sep 2011 15:01:59 +1000
Subject: idiomatic analogue of Perl's: while (<>) { ... }
In-Reply-To: <4E60394E.2080708@FreeBSD.org>
References: <4E60394E.2080708@FreeBSD.org>
Message-ID: <20110902050158.GA20589@cskk.homeip.net>

On 01Sep2011 22:02, Sahil Tandon <sahil at FreeBSD.org> wrote:
| [Thanks to everyone who responded]
| 
| Steven D'Aprano wrote:
| >On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:
| >>%%
| >># unbuffer STDOUT
| >>sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
| >
| >I've never bothered with unbuffered stdout, but that looks fine to me.
| >
| >I'm not sure if it is necessary though, because print seems to automatically
| >flush the buffer after each line in my testing. Unless you're printing
| >repeatedly to the same line, I'm not sure unbuffered stdout is helpful.
| 
| I found it necessary because without reopening sys.stdout with
| buffering explicitly turned off, I would have to manually flush the
| buffer after each print.  This is because the program must reply
| (via writing to STDOUT) after parsing each line read via STDIN.  If
| I neither disable buffering nor manually flush after each print, the
| program just hangs instead of printing right away.

Yes. Steven was probably testing on a terminal. UNIX stdio buffering is
line buffered on a terminal and block buffered otherwise (except for
stderr, which is normally unbuffered regardless). So Steven saw stuff
flushed on newlines and you would see stuff flushed when you explicitly
flush or when the buffer fills (probably doesn't happen for your use
because you need a response, and never write enough to fill the buffer).

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Gentle suggestions being those which are written on rocks of less than 5lbs.
        - Tracy Nelson in comp.lang.c


From anacrolix at gmail.com  Fri Sep  2 01:33:01 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Fri, 2 Sep 2011 15:33:01 +1000
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
Message-ID: <CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>

I guess the issue here is that you can't tell if an expression is
complete without checking the indent of the following line. This is
likely not desirable.

On Thu, Sep 1, 2011 at 11:43 PM, Yingjie Lan <lanyjie at yahoo.com> wrote:
> Hi Matt,
> =======================================================
> From: Matt Joiner <anacrolix at gmail.com>
>
> The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
> already heavily used by other syntactical structures.
> =======================================================
> How about only require indentation
> to freely break lines? Here is an example:
> x = firstpart * secondpart #line breaks here
> + anotherpart #continue by indentation
> + stillanother #continue on.
> #until here, another line starts by dedentation
> y = some_expression?- another_one
> All this would be completely compatible with former code, while
> having almost free line breaking! Plus, indentation makes it pretty.
> Really hope Python can have freedom in breaking lines.
> Yingjie


From pavlovevidence at gmail.com  Fri Sep  2 01:42:08 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 1 Sep 2011 22:42:08 -0700 (PDT)
Subject: Optparse buggy?
In-Reply-To: <roy-CFA28A.22161301092011@news.panix.com>
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
	<roy-CFA28A.22161301092011@news.panix.com>
Message-ID: <058eeca4-6892-4075-abab-3ddcf6773692@glegroupsg2000goo.googlegroups.com>

On Thursday, September 1, 2011 7:16:13 PM UTC-7, Roy Smith wrote:
> In article <mailman.666.13149139... at python.org>,
>  Terry Reedy <tjr... at udel.edu> wrote:
> 
> > Do note "The optparse module is deprecated and will not be developed 
> > further; development will continue with the argparse module."
> 
> One of the unfortunate things about optparse and argparse is the names.  
> I can never remember which is the new one and which is the old one.  It 
> would have been a lot simpler if the new one had been named optparse2 
> (in the style of unittest2 and urllib2).

It's easy: "opt"parse parses only "opt"ions (-d and the like), whereas "arg"parse parses all "arg"uments.  argparse is the more recent version since it does more.  optparse2 would have been a bad name for something that parses more than options.

(In fact, although I have some minor philosophical disagreements with optparse's design decisions, the main reason I always recommended using argparse instead was that optparse didn't handle positional arguments.  optparse has all these spiffy features with type checking and defaults, but it never occurred to the optparse developers that this stuff would be useful for positional arugments, too.  They just dropped the ball there.)


Carl Banks


From gahtune at gmail.com  Fri Sep  2 02:14:12 2011
From: gahtune at gmail.com (Gabriel AHTUNE)
Date: Fri, 2 Sep 2011 14:14:12 +0800
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
Message-ID: <CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>

So can be done with this syntax:

> x = firstpart * secondpart  +  #line breaks here
> anotherpart + #continue
> stillanother #continue on.

after a "+" operator the line is clearly not finished yet.

Gabriel AHTUNE


2011/9/2 Matt Joiner <anacrolix at gmail.com>

> I guess the issue here is that you can't tell if an expression is
> complete without checking the indent of the following line. This is
> likely not desirable.
>
> On Thu, Sep 1, 2011 at 11:43 PM, Yingjie Lan <lanyjie at yahoo.com> wrote:
> > Hi Matt,
> > =======================================================
> > From: Matt Joiner <anacrolix at gmail.com>
> >
> > The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
> > already heavily used by other syntactical structures.
> > =======================================================
> > How about only require indentation
> > to freely break lines? Here is an example:
> > x = firstpart * secondpart #line breaks here
> > + anotherpart #continue by indentation
> > + stillanother #continue on.
> > #until here, another line starts by dedentation
> > y = some_expression - another_one
> > All this would be completely compatible with former code, while
> > having almost free line breaking! Plus, indentation makes it pretty.
> > Really hope Python can have freedom in breaking lines.
> > Yingjie
> _______________________________________________
> Python-ideas mailing list
> Python-ideas at python.org
> http://mail.python.org/mailman/listinfo/python-ideas
>
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From sathish at solitontech.com  Fri Sep  2 02:17:18 2011
From: sathish at solitontech.com (Sathish S)
Date: Fri, 2 Sep 2011 11:47:18 +0530
Subject: Calling Script from Command line not working
In-Reply-To: <op.v05s24u3x6zn5v@lepton>
References: <CADBb1sdSMyiEKSaxPgScE_sCobpcVkFjuEJP0iFJ_KJJPFnQGg@mail.gmail.com>
	<op.v05s24u3x6zn5v@lepton>
Message-ID: <CADBb1seMVO70EeOE83+bR2YnCj8ToWz-oe_=2oSL_kHemB6xBA@mail.gmail.com>

Hey Gabriel,
Thanks a lot for replying. I was able to run this python script from
console/command prompt using cygwin python. I'm not sure whats the
difference between these two versions of python. But it seems to be working.
Searching theough the web i found that having cygwin1.dll could be causing
this issue. So I'm trying to build my DLL using MinGW which will not create
an dependecy DLL's. But I'm stuck up with few more issue in porting few
functions to MinGW.

I'm using Python2.7 and Cygwin Python 2.6.5

*Reply to your comments:*

** why do you initialize cygwin1.dll in Python? If it's a dependency of
my.dll, it might be better to load and initialize it there.*
Yes, cygwin1.dll is actually a dependency to my.dll. hence I'm loading it
and initializing it
** for this function prototype: void cygwin_dll_init(void);*
*you should declare it using:*
I'm doing this as you said. But didn't mention it in my mail

hCyg = cdll.LoadLibrary(CygWinDLL_Name)
hCyg = CDLL(CygWinDLL_Name)
Prototype_Cyg = CFUNCTYPE(c_void_p)
Init = Prototype_Cyg (("cygwin_dll_init", hCyg))
Init.restype = c_void_p
Init()

Thanks,
Sathish


On Fri, Sep 2, 2011 at 7:56 AM, Gabriel Genellina <gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 29 Aug 2011 07:40:06 -0300, Sathish S <sathish at solitontech.com>
> escribi?:
>
>
>  We created a DLL using cygwin and have written a class based python module
>> for the same. We have created a sample script for the class based python
>> module, that creates an object of the class and calls various methods in
>> the
>> class. This Test script works fine while I run it from IDLE. However when
>> I
>> run it from command prompt it either hangs or just returns without
>> executing
>> the functions. When it returns I do not get a error trace.
>>
>> When I tried to findout where exactly the issue is happening. the issue
>> occurs when I try to call the *cygwin_dll_init* method of the cygwin1.dll
>> .
>> This cygwin1.dll is actualy a dependency to the DLL we have built. So we
>> have to load this DLL and call this *cygwin_dll_init* method before
>> loading
>> my DLL.
>>
>>
>> cyg = cdll.LoadLibrary("cygwin1.dll"**)
>> cyg.cygwin_dll_init() #hangs or returns here
>> mydll=cdll.LoadLibrary("my.**dll")
>> mydll.func1()
>> I'm trying to understand what exactly is the difference, when we call it
>> IDLE and when we call it from command prompt using the python command. I
>> will have to get the script working from command prompt as well.
>>
>
> A few comments:
>
> * why do you initialize cygwin1.dll in Python? If it's a dependency of
> my.dll, it might be better to load and initialize it there.
>
> * for this function prototype: void cygwin_dll_init(void);
> you should declare it using:
>
>
> cyg = cdll.LoadLibrary("cygwin1.dll"**)
> cyg.restype = None
>
> cyg.cygwin_dll_init() #hangs or returns here
> ...
>
> Anyway, I don't see why a console application would fail but not inside
> IDLE.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
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From greg.ewing at canterbury.ac.nz  Fri Sep  2 02:19:58 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 02 Sep 2011 18:19:58 +1200
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <pan.2011.09.02.00.10.14.153000@nowhere.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<pan.2011.09.02.00.10.14.153000@nowhere.com>
Message-ID: <9cbashF8buU1@mid.individual.net>

> On Thu, 01 Sep 2011 08:52:49 -0700, Den wrote:
> 
>>Also, is there a corresponding key-sequence in Mac and Linux?

The nearest equivalent in MacOSX is Command-Option-Escape, which
brings up the force-quit dialog. I don't know how deep down in
the system it's implemented.

It's possible to use SetSystemUIMode to put an app into a "kiosk
mode" where force-quitting is disabled, but I don't know whether
the app can intercept Command-Option-Escape in that situation and
do something else with it.

-- 
Greg


From sathish at solitontech.com  Fri Sep  2 02:21:52 2011
From: sathish at solitontech.com (Sathish S)
Date: Fri, 2 Sep 2011 11:51:52 +0530
Subject: Calling Script from Command line not working
In-Reply-To: <CADBb1seMVO70EeOE83+bR2YnCj8ToWz-oe_=2oSL_kHemB6xBA@mail.gmail.com>
References: <CADBb1sdSMyiEKSaxPgScE_sCobpcVkFjuEJP0iFJ_KJJPFnQGg@mail.gmail.com>
	<op.v05s24u3x6zn5v@lepton>
	<CADBb1seMVO70EeOE83+bR2YnCj8ToWz-oe_=2oSL_kHemB6xBA@mail.gmail.com>
Message-ID: <CADBb1sefJfBODS32C2_8X6T9WvZ4j5i5PiLsfWSaE3jHaniu5Q@mail.gmail.com>

One more thing I observed is, while running the script from IDLE it launches
a seperate process of pythonw.exe and I could see this console window poping
up. However while running it from command prompt this does not happens. I
was wondering if the command prompt way of calling the script is not able to
launch this new process, that why it could be hanging.

BTW I'm still trying to get the script running using Python 2.7 from the
command prompt.

Thanks,
Sathish


On Fri, Sep 2, 2011 at 11:47 AM, Sathish S <sathish at solitontech.com> wrote:

> Hey Gabriel,
> Thanks a lot for replying. I was able to run this python script from
> console/command prompt using cygwin python. I'm not sure whats the
> difference between these two versions of python. But it seems to be working.
> Searching theough the web i found that having cygwin1.dll could be causing
> this issue. So I'm trying to build my DLL using MinGW which will not create
> an dependecy DLL's. But I'm stuck up with few more issue in porting few
> functions to MinGW.
>
> I'm using Python2.7 and Cygwin Python 2.6.5
>
> *Reply to your comments:*
>
>
> ** why do you initialize cygwin1.dll in Python? If it's a dependency of
> my.dll, it might be better to load and initialize it there.*
> Yes, cygwin1.dll is actually a dependency to my.dll. hence I'm loading it
> and initializing it
>
> ** for this function prototype: void cygwin_dll_init(void);*
> *you should declare it using:*
> I'm doing this as you said. But didn't mention it in my mail
>
> hCyg = cdll.LoadLibrary(CygWinDLL_Name)
> hCyg = CDLL(CygWinDLL_Name)
> Prototype_Cyg = CFUNCTYPE(c_void_p)
> Init = Prototype_Cyg (("cygwin_dll_init", hCyg))
> Init.restype = c_void_p
> Init()
>
> Thanks,
> Sathish
>
>
>
> On Fri, Sep 2, 2011 at 7:56 AM, Gabriel Genellina <gagsl-py2 at yahoo.com.ar>wrote:
>
>> En Mon, 29 Aug 2011 07:40:06 -0300, Sathish S <sathish at solitontech.com>
>> escribi?:
>>
>>
>>  We created a DLL using cygwin and have written a class based python
>>> module
>>> for the same. We have created a sample script for the class based python
>>> module, that creates an object of the class and calls various methods in
>>> the
>>> class. This Test script works fine while I run it from IDLE. However when
>>> I
>>> run it from command prompt it either hangs or just returns without
>>> executing
>>> the functions. When it returns I do not get a error trace.
>>>
>>> When I tried to findout where exactly the issue is happening. the issue
>>> occurs when I try to call the *cygwin_dll_init* method of the cygwin1.dll
>>> .
>>> This cygwin1.dll is actualy a dependency to the DLL we have built. So we
>>> have to load this DLL and call this *cygwin_dll_init* method before
>>> loading
>>> my DLL.
>>>
>>>
>>> cyg = cdll.LoadLibrary("cygwin1.dll"**)
>>> cyg.cygwin_dll_init() #hangs or returns here
>>> mydll=cdll.LoadLibrary("my.**dll")
>>> mydll.func1()
>>> I'm trying to understand what exactly is the difference, when we call it
>>> IDLE and when we call it from command prompt using the python command. I
>>> will have to get the script working from command prompt as well.
>>>
>>
>> A few comments:
>>
>> * why do you initialize cygwin1.dll in Python? If it's a dependency of
>> my.dll, it might be better to load and initialize it there.
>>
>> * for this function prototype: void cygwin_dll_init(void);
>> you should declare it using:
>>
>>
>> cyg = cdll.LoadLibrary("cygwin1.dll"**)
>> cyg.restype = None
>>
>> cyg.cygwin_dll_init() #hangs or returns here
>> ...
>>
>> Anyway, I don't see why a console application would fail but not inside
>> IDLE.
>>
>> --
>> Gabriel Genellina
>>
>> --
>> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>>
>
>
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From lanyjie at yahoo.com  Fri Sep  2 02:38:01 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Thu, 1 Sep 2011 23:38:01 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
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	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
Message-ID: <1314945481.74495.YahooMailNeo@web121517.mail.ne1.yahoo.com>



Hi Gabriel,

==================================================
From: Gabriel AHTUNE <gahtune at gmail.com>
Subject: Re: [Python-ideas] allow line break at operators


So can be done with this syntax:

> x = firstpart * secondpart? +? #line breaks here
> anotherpart + #continue 
> stillanother #continue on.

after a "+" operator the line is clearly not finished yet.

Gabriel AHTUNE

==================================================

That's good to me too, which I proposed early in this thread.
Then somebody would like to have the operator in the
beginning of the next line so that it would stand out.Then still another one said that indentation is good here.
So I finally proposed line continuation with indentation.
Since this is Python, we will live with indentation.
Currently indentation in Python starts a new block,
but if you view it from the perspective of line breaking,
it also function as if the line is continued. The line

if condition: do_a(); do_b()

can be ?written as:

if condition: #line breaks
do_a(); # ';' is optional here?
do_b() # continue

Sounds a pretty natural way to allow free line breaking.


Yingjie
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From lanyjie at yahoo.com  Fri Sep  2 02:45:07 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Thu, 1 Sep 2011 23:45:07 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
Message-ID: <1314945907.94847.YahooMailNeo@web121513.mail.ne1.yahoo.com>

Yeah, that might be a challenge for the Python?interpreter, for it has to check if the next line is indented or not. But it might be worthwhile to take this trouble, so that the coder has more freedom, and the code is hopefully better to read.


________________________________
From: Matt Joiner <anacrolix at gmail.com>
To: Yingjie Lan <lanyjie at yahoo.com>
Cc: "python-list at python.org" <python-list at python.org>; python-ideas <python-ideas at python.org>
Sent: Friday, September 2, 2011 1:33 PM
Subject: Re: [Python-ideas] allow line break at operators

I guess the issue here is that you can't tell if an expression is
complete without checking the indent of the following line. This is
likely not desirable.

On Thu, Sep 1, 2011 at 11:43 PM, Yingjie Lan <lanyjie at yahoo.com> wrote:
> Hi Matt,
> =======================================================
> From: Matt Joiner <anacrolix at gmail.com>
>
> The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
> already heavily used by other syntactical structures.
> =======================================================
> How about only require indentation
> to freely break lines? Here is an example:
> x = firstpart * secondpart #line breaks here
> + anotherpart #continue by indentation
> + stillanother #continue on.
> #until here, another line starts by dedentation
> y = some_expression?- another_one
> All this would be completely compatible with former code, while
> having almost free line breaking! Plus, indentation makes it pretty.
> Really hope Python can have freedom in breaking lines.
> Yingjie
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From me+list/python at ixokai.io  Fri Sep  2 03:06:12 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Fri, 02 Sep 2011 00:06:12 -0700
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <4E608064.9030005@ixokai.io>

On 9/1/11 8:52 AM, Den wrote:
> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?

IIUC, by definition, Ctrl-Alt-Delete can't be responded to in any way.
Its the entire point of the sequence: when you type it you can be
entirely, totally, 100% certain that what happens next is the true OS
and not any app faking things.

That's why you have to hit CAD to get to the login form in some versions
of Windows. The whole point of that secure sequence is that the OS and
only the OS responds.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

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From tavares at fe.up.pt  Fri Sep  2 03:08:14 2011
From: tavares at fe.up.pt (tavares at fe.up.pt)
Date: Fri, 2 Sep 2011 00:08:14 -0700 (PDT)
Subject: CompIMAGE 2012: Call for Thematic Sessions and Papers
Message-ID: <ddaa0b56-c3a8-4576-9e70-a75c9a9f20ba@h11g2000vbc.googlegroups.com>

Dear Colleague,

We would like to call your attention to the International Symposium
CompIMAGE 2012 ? Computational Modeling of Objects Presented in
Images: Fundamentals, Methods and Applications (www.dis.uniroma1.it/
compimage2012), that will be held in Rome, Italy, in September 5-7,
2012.

MAIN TOPICS

- image processing and analysis
- image segmentation
- 2D and 3D reconstruction
- data interpolation
- registration and acquisition
- objects tracking
- scientific data visualization
- satellite data
- shape modeling
- simulation
- biometric person identification
- medical imaging
- motion and deformation analysis
- material science
- large set data visualization
- vision in robotics and automation

INVITED LECTURERS

- Lorenzo Bruzzone, University of Trento, Italy
- Jorge Marques, Instituto Superior T?cnico, Lisboa, Portugal
- Fiorella Sgallari, University of Bologna, Italy
- Bertrand Thirion, INRIA, France
- Luminita Vese, UCLA, USA

THEMATIC SESSIONS

Proposals to organize Thematic Session within CompIMAGE2012 are
welcome and should be submitted by email to:
compimage2012 at dis.uniroma1.it.

PUBLICATIONS

- The proceedings book will be published by Taylor & Francis Group and
indexed by Thomson Reuters Conference Proceedings Citation Index, IET
Inspect and Elsevier Scopus.

- A book with 20 invited works from the best ones presented in
CompIMAGE 2012 (extended versions) will be published by Springer.

- The organizers will encourage the submission of extended versions of
the accepted papers to related International Journals; in particular,
for special issues dedicated to CompIMAGE 2012.

IMPORTANT DATES

- Deadline for Thematic Sessions proposals: November 1, 2011
- Deadline for Full Paper Submission: December 31, 2011
- Authors Notification: March 16, 2012
- Final camera-ready papers: April 20, 2012
- Early Symposium registration (mandatory for Authors): April 20, 2012
- Symposium dates: September 5-7, 2012

AWARDS

"Best paper award" and "Best student paper award" are going to be
given to the author(s) of two papers presented at CompIMAGE 2012,
selected by the Organizing Committee based on the best combined marks
from the Scientific Committee and Session Chairs.

Kind regards,

Paolo Di Giamberardino
Daniela Iacoviello
Renato M. Natal Jorge
Jo?o Manuel R. S. Tavares

PS. For further details, please, visit CompIMAGE 2012 website at:
www.dis.uniroma1.it/compimage2012.


From nemjain at gmail.com  Fri Sep  2 03:12:18 2011
From: nemjain at gmail.com (nemi)
Date: Fri, 2 Sep 2011 00:12:18 -0700 (PDT)
Subject: How to daemonize a HTTPServer
References: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
	<j3nmvr$98t$1@dont-email.me>
Message-ID: <d8e93c2a-eb02-467d-9473-1f623f474067@t30g2000prm.googlegroups.com>

On Sep 1, 6:32?am, "Martin P. Hellwig" <martin.hell... at gmail.com>
wrote:
> On 01/09/2011 04:16, babbu Pehlwan wrote:
>
> > I have written a http server using BaseHTTPServer module. Now I want
> > to instantiate it through another python script. The issue here is
> > after instantiate the control doesn't come back till the server is
> > running. Please suggest.
>
> Sounds like something you could use the multiprocessing module for, but
> then again my crystal ball is a bit fuzzy today.
>
> --
> mph

Thanks dear, the issue get solved now. You are absolutely right,
actually I was daemonising the same thread. Now I have created a
seperate thread for the server.


From stephen at xemacs.org  Fri Sep  2 03:28:16 2011
From: stephen at xemacs.org (Stephen J. Turnbull)
Date: Fri, 02 Sep 2011 16:28:16 +0900
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
Message-ID: <877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>

Gabriel AHTUNE writes:
 > So can be done with this syntax:
 > 
 > > x = firstpart * secondpart  +  #line breaks here
 > > anotherpart + #continue
 > > stillanother #continue on.
 > 
 > after a "+" operator the line is clearly not finished yet.

Sure, but IIRC one design principle of Python is that the keyword that
denotes the syntax should be the first thing on the line, making it
easy to scan down the left side of the code to see the syntactic
structure.  The required indentation of the controlled suite also
helps emphasize that keyword.

Analogously, if operators are going to denote continuation, they
should come first on the line.

I just don't think this idea is going anywhere.  Explicit continuation
with backslash or implicit continuation of parenthesized expressions
is just not that heavy a price to pay.  Perhaps historically some of
these ideas could have been implemented, but now they're just going to
confuse a host of editors and code analysis tools.


From rosuav at gmail.com  Fri Sep  2 03:55:41 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 2 Sep 2011 17:55:41 +1000
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <4E608064.9030005@ixokai.io>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<4E608064.9030005@ixokai.io>
Message-ID: <CAPTjJmqb7ferhp8dg5pZqS-U1vdHJkBohzFE_2rR30=9wEYQeA@mail.gmail.com>

On Fri, Sep 2, 2011 at 5:06 PM, Stephen Hansen <me+list/python at ixokai.io> wrote:
> That's why you have to hit CAD to get to the login form in some versions
> of Windows. The whole point of that secure sequence is that the OS and
> only the OS responds.
>

Although I heard somewhere that that's more gimmick than guarantee,
and that it IS possible for an app to hook CAD - just that it's a lot
harder than building a simple window that looks like the login... but
it's pretty easy to fool a lot of people. Just look at the emails in
your spam box one day, find the ones spoofing a bank, and see what a
poor job they do. And yet they work.

ChrisA


From vinay_sajip at yahoo.co.uk  Fri Sep  2 05:56:29 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 02:56:29 -0700 (PDT)
Subject: Help me understand this logging config
References: <bdf729a3-5f68-46fb-b6ae-27dceed5af77@18g2000yqu.googlegroups.com>
	<mailman.566.1314696279.27778.python-list@python.org>
	<roy-7F52BC.08392630082011@news.panix.com>
Message-ID: <fa2db494-bd1b-40f1-bfcf-5be31c8f97a6@a31g2000vbt.googlegroups.com>

On Aug 30, 1:39 pm, Roy Smith <r... at panix.com> wrote:
> Oh, my, it turns out that django includes:
>
> # This is a copy of the Pythonlogging.config.dictconfig module,
> # reproduced with permission. It is provided here for backwards
> # compatibility for Python versions prior to 2.7.
>
> Comparing the django copy to lib/logging/config.py from Python 2.7.2,
> they're not identical.  It's likely they grabbed something earlier in
> the 2.7 series.  I'll check 2.7.0 and 2.7.1 to see.

They're not identical, but should be functionally equivalent. I'm not
able to reproduce your results: I copied the "loggers" part of your
config into a Django 1.3 project, and from a manage.py shell session:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import logging
>>> logger = logging.getLogger('djfront.auth.facebook')
>>> logger.debug('Debug')
>>> logger.info('Info')
2011-09-02 10:51:13,445 INFO     djfront.auth.facebook Info
>>>

... as expected.

Since it's Python 2.6, it should be using the dictconfig which ships
with Django 1.3.

Regards,

Vinay Sajip


From vinay_sajip at yahoo.co.uk  Fri Sep  2 05:58:29 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 09:58:29 +0000 (UTC)
Subject: Help me understand this logging config
References: <bdf729a3-5f68-46fb-b6ae-27dceed5af77@18g2000yqu.googlegroups.com>
	<mailman.566.1314696279.27778.python-list@python.org>
	<roy-7F52BC.08392630082011@news.panix.com>
Message-ID: <loom.20110902T115801-476@post.gmane.org>

On Aug 30, 1:39 pm, Roy Smith <r... at panix.com> wrote:
> Oh, my, it turns out that django includes:
> 
> # This is a copy of the Pythonlogging.config.dictconfig module,              
                     
> # reproduced with permission. It is provided here for backwards              
                     
> # compatibility for Python versions prior to 2.7.
> 
> Comparing the django copy to lib/logging/config.py from Python 2.7.2,
> they're not identical.  It's likely they grabbed something earlier in
> the 2.7 series.  I'll check 2.7.0 and 2.7.1 to see.

They're not identical, but should be functionally equivalent. I'm not able to
reproduce your results: I copied the "loggers" part of your config into a Django
1.3 project, and from a manage.py shell session:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import logging
>>> logger = logging.getLogger('djfront.auth.facebook')
>>> logger.debug('Debug')
>>> logger.info('Info')
2011-09-02 10:51:13,445 INFO     djfront.auth.facebook Info
>>> 

... as expected.

Since it's Python 2.6, it should be using the dictconfig which ships with Django
1.3.

Regards,

Vinay Sajip



From vinay_sajip at yahoo.co.uk  Fri Sep  2 06:00:30 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 03:00:30 -0700 (PDT)
Subject: Help me understand this logging config
References: <bdf729a3-5f68-46fb-b6ae-27dceed5af77@18g2000yqu.googlegroups.com>
	<mailman.566.1314696279.27778.python-list@python.org>
	<roy-7F52BC.08392630082011@news.panix.com>
Message-ID: <d4a6dc37-0165-4209-ac79-2fbdc507dcdc@er4g2000vbb.googlegroups.com>

On Aug 30, 1:39 pm, Roy Smith <r... at panix.com> wrote:
> Oh, my, it turns out that django includes:
>
> # This is a copy of the Pythonlogging.config.dictconfig module,
> # reproduced with permission. It is provided here for backwards
> # compatibility for Python versions prior to 2.7.
>
> Comparing the django copy to lib/logging/config.py from Python 2.7.2,
> they're not identical.  It's likely they grabbed something earlier in
> the 2.7 series.  I'll check 2.7.0 and 2.7.1 to see.

They're not identical, but should be functionally equivalent. I'm not
able to reproduce your results: I copied the "loggers" part of your
config into a Django 1.3 project, and from a manage.py shell session:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import logging
>>> logger = logging.getLogger('djfront.auth.facebook')
>>> logger.debug('Debug')
>>> logger.info('Info')
2011-09-02 10:51:13,445 INFO     djfront.auth.facebook Info
>>>

... as expected.

Since it's Python 2.6, it should be using the dictconfig which ships
with Django 1.3.

Regards,

Vinay Sajip


From t at jollybox.de  Fri Sep  2 06:01:34 2011
From: t at jollybox.de (Thomas Jollans)
Date: Fri, 02 Sep 2011 12:01:34 +0200
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <4E60A97E.2080506@jollybox.de>

On 01/09/11 17:52, Den wrote:
> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?
> 
> Also, is there a corresponding key-sequence in Mac and Linux?  And how
> might one detect those too?

On Linux Ctrl+Alt+Delete is typically configured to reboot the machine
when in console mode. In X11 (graphical), as far as I know, it's no
different than other keys. To catch it globally, you'd probably have to
go through the individual window manager.

As m'colleague Nobody mentions, there's also the SysRq feature, but that
always goes straight to the kernel and is, like Ctrl+Alt+Delete on
Windows, impossible to handle in userspace code.

Thomas


From fnautaNO at SPAMsolfon.nl  Fri Sep  2 08:04:55 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 14:04:55 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><6545843.yvFAXZvWTv@PointedEars.de><9c528rFi5aU1@mid.individual.net><4761603.ypaU67uLZW@PointedEars.de><9c6d4cFa54U1@mid.individual.net>
	<mailman.622.1314812583.27778.python-list@python.org>
Message-ID: <9cbvupFjr3U2@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.622.1314812583.27778.python-list at python.org...
> On Wed, 31 Aug 2011 11:27:36 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>>
>> Ofcourse I realized it was Unix/Linux. I already could tell that as the
>> packages I downloaded were tar.gz files.
>> So I unpacked them and expected to run a Python installer script from the
>> Python command line.
>> Hence my question "How do I do that", but perhaps I did not make myself
>> clear enough.
>>
> NO Python package installer runs "from the Python command line" (ie;
> from a Python interactive session prompt).
>
> Typically you run them from the OS command interpreter. If the
> installer is a .py file and the associations are correct, the Python
> interpreter will be started to process the installer script. If the
> associations aren't set, you may have to enter
>
> python installer.py
>
> at the system prompt instead of
>
> installer.py
>
>> Tried to run the Python installer script from the DOS command line but 
>> that
>> resulted in an error.
>>
> Okay -- so what was the error?
> -- 

Sorry - I didn't come back on your question. In the mean time I forgot what 
the error message was.
But I installed it the way Paul K?lle mentioned:

"You dont install from "Python GUI", use normal cmd, navigate to the
folder you downloaded PyXML and PyWebDAV and run "python setup.py
install" (python.exe has to be in your PATH)."

Fokke




From fnautaNO at SPAMsolfon.nl  Fri Sep  2 08:19:32 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 14:19:32 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
Message-ID: <9cbvupFjr3U3@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.687.1314941410.27778.python-list at python.org...
> On Thu, 1 Sep 2011 12:30:43 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>> "Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message
>> news:mailman.643.1314851358.27778.python-list at python.org...
>
>> > Next, if you'd read further and didn't take the comment as the
>> > instruction. set
>> > firstrun=1
>>
>> I did
>>
>> > to tell the server this is the first time it is being run - IT WILL
>> > create the database table (after the first start, reset the flag to 0 
>> > to
>> > speed up later runs).
>>
>> It didn't create the table. The database kept empty.
>
> Odd -- but then, I'm not running it myself, and wasn't up to reading
> all the code to see what path it takes.

It's only for experimenting with calendar software, so authorization is not 
a point.
So I forget about MySQL.

>>
>> > Later in the config file set
>> > mysql_auth=1
>> > to enable the use of MySQL, and set the admin user/password to what you
>> > plan to have it use.
>>
>> I did
>>
>> > You probably want to set
>> > daemonize=1
>> > (maybe after first run)
>>
>> I left this to 0.
>>
>> > Oh, and don't forget to set the main data directory and any
>> > port/host changes.
>>
>> I left host and port as they were. The main directory is e:\wwwroot
>>
>> > Start the server - it should connect to MySQL, create the table, and
>> > add the admin user to the table.
>>
>> I started the server with server.py (in
>> D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini
>>
> If the main directory is already in the config file, you probably
> don't need to specify it on the command line...

OK

> And... could there be
> something in the code where overriding the directory by command line
> changes where it looks for the config file? (Just guessing at this
> point).
>

Possibly.
I tried this:
server.py -n -c config.ini
Once again, the server is up and running and when I am logging in with my 
browser (10.0.0.140:8081) I can see information showing up at the command 
prompt, showing somebody is logging is, but the same error: 
"fshandler:get_data: \Webdav not found". During starting up the server 
mentioned: "pywebdav:Serving data from \Webdav".

In the config file it says:
"# main directory
directory = \Webdav"

Perhaps my Python configuration is at fault.

Fokke 




From msamogh at gmail.com  Fri Sep  2 08:25:28 2011
From: msamogh at gmail.com (Amogh M S)
Date: Fri, 2 Sep 2011 17:55:28 +0530
Subject: Python-list Digest, Vol 96, Issue 4
In-Reply-To: <mailman.66.1314871203.20590.python-list@python.org>
References: <mailman.66.1314871203.20590.python-list@python.org>
Message-ID: <CABWGKeWzCeuQ6QyjoS7JdpP0ho3-6QZXxHm=BAohUnxPQzXnSw@mail.gmail.com>

Thank you very much
And no, no, I have not been reading a book with bad font =D haha!!
The problem was that I did not inherit from Object... Since I am from a JAVA
background, I assumed that Python would inherit implicitly.
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From sjmsoft at gmail.com  Fri Sep  2 08:27:50 2011
From: sjmsoft at gmail.com (sjm)
Date: Fri, 2 Sep 2011 05:27:50 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <c287acc8-8fec-4f3d-ad64-bea090ed8eae@w28g2000yqw.googlegroups.com>

On Sep 1, 12:52?pm, Den <patents... at gmail.com> wrote:
> Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?

If you manage to write a program that can detect CTRL-ALT-DEL, please
report it as a bug in Windows!  CTRL-ALT-DEL is Windows' "secure
attention sequence" which must only be handled by the OS.

-- Steve



From msamogh at gmail.com  Fri Sep  2 08:29:17 2011
From: msamogh at gmail.com (Amogh M S)
Date: Fri, 2 Sep 2011 17:59:17 +0530
Subject: Python-list Digest, Vol 96, Issue 4
In-Reply-To: <CABWGKeWzCeuQ6QyjoS7JdpP0ho3-6QZXxHm=BAohUnxPQzXnSw@mail.gmail.com>
References: <mailman.66.1314871203.20590.python-list@python.org>
	<CABWGKeWzCeuQ6QyjoS7JdpP0ho3-6QZXxHm=BAohUnxPQzXnSw@mail.gmail.com>
Message-ID: <CABWGKeUd+r6XmtTHo-2N2NcD6jxf5BtU4BsOHN=h4csSiDH+BQ@mail.gmail.com>

Two underscores??!!! OH!!! I thank thee!
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From mail at timgolden.me.uk  Fri Sep  2 08:45:39 2011
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 02 Sep 2011 13:45:39 +0100
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <4e60ce59$0$18107$426a74cc@news.free.fr>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<4e60ce59$0$18107$426a74cc@news.free.fr>
Message-ID: <4E60CFF3.6080006@timgolden.me.uk>

>> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
>> is handled deep inside the OS, and I'm not trying to interrupt that.
>> But is there some way to detect that a C-A-D has been pressed?

Others have pointed out that this shouldn't really be possible for
reasons of security. (And I agree). However, if what you're really
after is to detect a session switch or a logon then this might
be of some use:

http://timgolden.me.uk/python/win32_how_do_i/track-session-events.html

TJG


From bex.lewis at gmail.com  Fri Sep  2 09:09:06 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Fri, 2 Sep 2011 06:09:06 -0700 (PDT)
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
Message-ID: <86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>

On Sep 2, 1:19?pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in messagenews:mailman.687.1314941410.27778.python-list at python.org...
>
>
>
>
>
>
>
>
>
> > On Thu, 1 Sep 2011 12:30:43 +0200, "Fokke Nauta"
> > <fnaut... at SPAMsolfon.nl> declaimed the following in
> > gmane.comp.python.general:
>
> >> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in message
> >>news:mailman.643.1314851358.27778.python-list at python.org...
>
> >> > Next, if you'd read further and didn't take the comment as the
> >> > instruction. set
> >> > firstrun=1
>
> >> I did
>
> >> > to tell the server this is the first time it is being run - IT WILL
> >> > create the database table (after the first start, reset the flag to 0
> >> > to
> >> > speed up later runs).
>
> >> It didn't create the table. The database kept empty.
>
> > Odd -- but then, I'm not running it myself, and wasn't up to reading
> > all the code to see what path it takes.
>
> It's only for experimenting with calendar software, so authorization is not
> a point.
> So I forget about MySQL.
>
>
>
>
>
>
>
>
>
>
>
> >> > Later in the config file set
> >> > mysql_auth=1
> >> > to enable the use of MySQL, and set the admin user/password to what you
> >> > plan to have it use.
>
> >> I did
>
> >> > You probably want to set
> >> > daemonize=1
> >> > (maybe after first run)
>
> >> I left this to 0.
>
> >> > Oh, and don't forget to set the main data directory and any
> >> > port/host changes.
>
> >> I left host and port as they were. The main directory is e:\wwwroot
>
> >> > Start the server - it should connect to MySQL, create the table, and
> >> > add the admin user to the table.
>
> >> I started the server with server.py (in
> >> D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini
>
> > If the main directory is already in the config file, you probably
> > don't need to specify it on the command line...
>
> OK
>
> > And... could there be
> > something in the code where overriding the directory by command line
> > changes where it looks for the config file? (Just guessing at this
> > point).
>
> Possibly.
> I tried this:
> server.py -n -c config.ini
> Once again, the server is up and running and when I am logging in with my
> browser (10.0.0.140:8081) I can see information showing up at the command
> prompt, showing somebody is logging is, but the same error:
> "fshandler:get_data: \Webdav not found". During starting up the server
> mentioned: "pywebdav:Serving data from \Webdav".
>
> In the config file it says:
> "# main directory
> directory = \Webdav"
>
> Perhaps my Python configuration is at fault.
>
> Fokke

Is the path supposed to be absolute? In which case you'd need to have:
directory=C:\path\to\Webdav

instead of just
directory=\Webdav


Becky Lewis


From python at bdurham.com  Fri Sep  2 09:11:13 2011
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 02 Sep 2011 09:11:13 -0400
Subject: Installing WebDAV server
In-Reply-To: <9cbvupFjr3U3@mid.individual.net>
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
Message-ID: <1314969073.6889.140258136595213@webmail.messagingengine.com>

Hi Fokke,

Disclaimer: I have no experience with the Python WebDAV package you're
using.

But a thought:

> In the config file it says:
> "# main directory
> directory = \Webdav"

Perhaps you should qualify your directory path with a drive letter?

I would try this 2 ways:

directory = E:\Webdav

And if that doesn't work:

directory = E:/Webdav

My thinking about the 2nd example is that perhaps the \W is getting
interpreted as a control character vs. "backslash" "W".

Malcolm


From alan.isaac at gmail.com  Fri Sep  2 09:12:37 2011
From: alan.isaac at gmail.com (Alan)
Date: Fri, 2 Sep 2011 06:12:37 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>

http://www.pytex.org/

hth,
Alan Isaac


From alan.isaac at gmail.com  Fri Sep  2 09:12:37 2011
From: alan.isaac at gmail.com (Alan)
Date: Fri, 2 Sep 2011 06:12:37 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>

http://www.pytex.org/

hth,
Alan Isaac


From kw at codebykevin.com  Fri Sep  2 09:21:43 2011
From: kw at codebykevin.com (Kevin Walzer)
Date: Fri, 02 Sep 2011 09:21:43 -0400
Subject: OSX application built with py2app can't see bundled PySide module?
In-Reply-To: <2e0b44ea-0d71-4c30-8efe-6582cf6923bd@glegroupsg2000goo.googlegroups.com>
References: <2e0b44ea-0d71-4c30-8efe-6582cf6923bd@glegroupsg2000goo.googlegroups.com>
Message-ID: <j3ql94$dh2$1@dont-email.me>

On 9/1/11 3:54 PM, Aaron Scott wrote:
> I'm trying to deploy a Python app on OSX that was built with PySide. py2app packages it without issue, copying and linking a lot of PySide and Qt files in the process. But then, when I try to run the built app, I get this error:
>
> Traceback (most recent call last):
>    File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 31, in<module>
>      _run('dailies_v02.py')
>    File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 28, in _run
>      execfile(path, globals(), globals())
>    File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/dailies_v02.py", line 9, in<module>
> from PySide.QtCore import *
>    File "PySide/__init__.pyc", line 2, in<module>
>    File "PySide/private.pyc", line 2, in<module>
>    File "PySide/QtCore.pyc", line 18, in<module>
>    File "PySide/QtCore.pyc", line 15, in __load
> ImportError: '/usr/lib/python2.6/lib-dynload/PySide/QtCore.so' not found
>
> The weird thing is, QtCore.so IS included in the application bundle: py2app copied it to the build under Contents/Resources/lib/python2.6/lib-dynload/PySide/. Is there a reason the application isn't seeing this?

You might want to post this question to the MacPython list--that's where 
the py2app experts are found.

-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From python at bdurham.com  Fri Sep  2 09:49:30 2011
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 02 Sep 2011 09:49:30 -0400
Subject: slightly OT -- LaTeX
In-Reply-To: <5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>
References: <mailman.677.1314927521.27778.python-list@python.org>
	<5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>
Message-ID: <1314971370.18457.140258136609677@webmail.messagingengine.com>

Hi Alan,

Thanks for sharing that link - very interesting!
http://www.pytex.org/

Malcolm (former LaTeX/TeX user from early 90's)



From bkasterm at gmail.com  Fri Sep  2 09:54:50 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Fri, 02 Sep 2011 07:54:50 -0600
Subject: List comprehension timing difference.
References: <87zkinkcht.fsf@gmail.com>
	<mailman.676.1314925972.27778.python-list@python.org>
Message-ID: <87sjofjbh1.fsf@gmail.com>

MRAB <python at mrabarnett.plus.com> writes:

> On 02/09/2011 01:35, Bart Kastermans wrote:

>> graph = [[a,b] for a in data for b in data if d(a,b) ==1 and a<  b]

>> graph2 = []
>> for i in range (0, len(data)):
>>      for j in range(0,len(data)):
>>          if d(data[i],data[j]) == 1 and i<  j:
>>              graph2.append ([i,j])

>
> Are they actually equivalent? Does graph == graph2?
>
> The first version (list comprehension) creates a list of pairs of
> values:
>
>     [a, b]
>
> whereas the second version (for loops) creates a list of pairs of
> indexes:
>
>     [i, j]
>
> The second version has subscripting ("data[i]" and "data[j]"), which
> will slow it down.

You are absolutely right.  I had changed the code from the
equivalent:

    graph2 = []
    for i in range (0, len(data)):
        for j in range(0,len(data)):
            if d(data[i],data[j]) == 1 and i < j:
                graph2.append ([data[i],data[j]])

But then also tried the equivalent

    for a in data:
        for b in data:
            if d(a,b) == 1 and a < b:
                graph2.append([a,b])

Which does away with the indexing, and is just about exactly as
fast as the list comprehension.


That'll teach me; I almost didn't ask the question thinking it might 
be silly.  And it was, but I thought it for the wrong reason.  I tell my
students there are no stupid questions, I should listen to myself
more when I do.  Thanks!


From ting at thsu.org  Fri Sep  2 10:50:24 2011
From: ting at thsu.org (ting at thsu.org)
Date: Fri, 2 Sep 2011 07:50:24 -0700 (PDT)
Subject: List comprehension timing difference.
References: <87zkinkcht.fsf@gmail.com>
	<mailman.676.1314925972.27778.python-list@python.org>
	<87sjofjbh1.fsf@gmail.com>
Message-ID: <07906043-d732-43ca-8313-bee4746eca75@fi7g2000vbb.googlegroups.com>

On Sep 2, 9:54?am, Bart Kastermans <bkast... at gmail.com> wrote:
> if d(a,b) == 1 and a < b:

It will probably be faster if you reverse the evaluation order of that
expression.

if a<b and d(a,b)==1:

That way the d() function is called less than half the time. Of course
this assumes that a<b is a faster evaluation than d(a,b), but I think
that's true for your example.
--
// T.Hsu


From roy at panix.com  Fri Sep  2 10:53:35 2011
From: roy at panix.com (Roy Smith)
Date: Fri, 2 Sep 2011 07:53:35 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
Message-ID: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>

I have a function I want to run in a thread and return a value.  It
seems like the most obvious way to do this is to have my target
function return the value, the Thread object stash that someplace, and
return it as the return value for join().

Yes, I know there's other ways for a thread to return values (pass the
target a queue, for example), but making the return value of the
target function available would have been the most convenient.  I'm
curious why threading wasn't implemented this way.


From d_vineet at yahoo.com  Fri Sep  2 11:34:25 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Fri, 2 Sep 2011 08:34:25 -0700 (PDT)
Subject: convert python List to javascript array
Message-ID: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>

Hi !
Within a web framework, I want want to pass a python sequence (list or tuple) to client-side javascript function as an array (javascript compatible)
e.g., I have this list:
L = ['spam', 'ham', 'eggs', 12, (13.63)]
What is the correct way to convert L to?javascript array format? 

1) jsonify the list and pass it to javascript
(whether json format & javascript array are similar?)

OR
2) 
>> import array
>> y = array.array(i, L)
?then return y to javascript function
But the problem with this method is, it will give an array of basic values only.

OR
3) Any other alternative?

Thanks,
Vineet
-------------- next part --------------
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From steve+comp.lang.python at pearwood.info  Fri Sep  2 11:45:22 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 03 Sep 2011 01:45:22 +1000
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
Message-ID: <4e60fa12$0$29992$c3e8da3$5496439d@news.astraweb.com>

Roy Smith wrote:

> I have a function I want to run in a thread and return a value.  It
> seems like the most obvious way to do this is to have my target
> function return the value, the Thread object stash that someplace, and
> return it as the return value for join().
> 
> Yes, I know there's other ways for a thread to return values (pass the
> target a queue, for example), but making the return value of the
> target function available would have been the most convenient.  I'm
> curious why threading wasn't implemented this way.

Because then the code launching the thread would have to block, waiting
until the thread is completed, so it will have a result to return.


-- 
Steven



From benjamin.kaplan at case.edu  Fri Sep  2 11:50:12 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 2 Sep 2011 11:50:12 -0400
Subject: convert python List to javascript array
In-Reply-To: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
Message-ID: <CAMuTYXjN1ad4zYsC4VEBMKuXLqWOoNqLJGEPQyykuaug2izASw@mail.gmail.com>

On Fri, Sep 2, 2011 at 11:34 AM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
> Hi !
> Within a web framework, I want want to pass a python sequence (list or
> tuple) to client-side javascript function as an array (javascript
> compatible)
> e.g., I have this list:
> L = ['spam', 'ham', 'eggs', 12, (13.63)]
> What is the correct way to convert L to?javascript array format?
> 1) jsonify the list and pass it to javascript
> (whether json format & javascript array are similar?)
>
> OR
> 2)
>>> import array
>>> y = array.array(i, L)
> ?then return y to javascript function
> But the problem with this method is, it will give an array of basic values
> only.
>
> OR
> 3) Any other alternative?
>
> Thanks,
> Vineet
> --

The JavaScript Object Notation (JSON) is meant exactly for this purpose.


From patentsvnc at gmail.com  Fri Sep  2 12:19:35 2011
From: patentsvnc at gmail.com (Den)
Date: Fri, 2 Sep 2011 09:19:35 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<c287acc8-8fec-4f3d-ad64-bea090ed8eae@w28g2000yqw.googlegroups.com>
Message-ID: <4310f6ad-8aab-481b-9e68-3931f67b49b6@m4g2000pri.googlegroups.com>

On Sep 2, 5:27?am, sjm <sjms... at gmail.com> wrote:
> On Sep 1, 12:52?pm, Den <patents... at gmail.com> wrote:
>
> > Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> > is handled deep inside the OS, and I'm not trying to interrupt that.
> > But is there some way to detect that a C-A-D has been pressed?
>
> If you manage to write a program that can detect CTRL-ALT-DEL, please
> report it as a bug in Windows! ?CTRL-ALT-DEL is Windows' "secure
> attention sequence" which must only be handled by the OS.
>
> -- Steve

I have already done that, in AutoHotKey ... or at least it used to
work.  AHK can detect when a window opened.  And when CAD was pressed
the ... well, I've forgotten what it was called ... but a window
opened asking if you wanted to open the task manager, or quit or log
off or what.  Then you would know that CAD was pressed.  There was
nothing you could do to stop it, but you could at least detect that it
had been pressed.

That's why I was wondering if there was a similar technique which
could be used in Python.

Den


From patentsvnc at gmail.com  Fri Sep  2 12:20:23 2011
From: patentsvnc at gmail.com (Den)
Date: Fri, 2 Sep 2011 09:20:23 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<c287acc8-8fec-4f3d-ad64-bea090ed8eae@w28g2000yqw.googlegroups.com>
Message-ID: <2ab915f4-a0cb-42ed-8d4b-5bd16a9ee9ca@x21g2000prd.googlegroups.com>

On Sep 2, 5:27?am, sjm <sjms... at gmail.com> wrote:
> On Sep 1, 12:52?pm, Den <patents... at gmail.com> wrote:
>
> > Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> > is handled deep inside the OS, and I'm not trying to interrupt that.
> > But is there some way to detect that a C-A-D has been pressed?
>
> If you manage to write a program that can detect CTRL-ALT-DEL, please
> report it as a bug in Windows! ?CTRL-ALT-DEL is Windows' "secure
> attention sequence" which must only be handled by the OS.
>
> -- Steve

I'm not trying to hook it or stop it, just detect it.

Den


From patentsvnc at gmail.com  Fri Sep  2 12:26:12 2011
From: patentsvnc at gmail.com (Den)
Date: Fri, 2 Sep 2011 09:26:12 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <d5a699af-83ae-48ca-b32c-3aedc4a96d2a@s2g2000prm.googlegroups.com>

On Sep 1, 8:52?am, Den <patents... at gmail.com> wrote:
> Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?
>
> Also, is there a corresponding key-sequence in Mac and Linux? ?And how
> might one detect those too?
>
> Den

I've been doing some more thinking on what I want.  This may be a
better explanation.  Is there a way of detecting if my program has
lost "focus" (I'm not sure the correct term)?  For example, if someone
is typing in my program, but some other program takes control (or CAD
has been pressed) I would like simply to log that.  I have no interest
in trying to hijack or interfere with anything, simply log it.

Den


From gagsl-py2 at yahoo.com.ar  Fri Sep  2 12:36:17 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 13:36:17 -0300
Subject: Handling 2.7 and 3.0 Versions of Dict
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
Message-ID: <op.v06wes1px6zn5v@lepton>

En Wed, 31 Aug 2011 22:28:09 -0300, Travis Parks <jehugaleahsa at gmail.com>  
escribi?:

> On Aug 31, 7:37 pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> Ian Kelly wrote:
>> > if sys.version_info < (3,):
>> >     getDictValues = dict.itervalues
>> > else:
>> >     getDictValues = dict.values
>>
>> > (which is basically what the OP was doing in the first place).
>>
> My problem was that I didn't understand the scoping rules. It is still
> strange to me that the getValues variable is still in scope outside
> the if/else branches.

Those if/else are at global scope. An 'if' statement does not introduce a  
new scope; so getDictValues, despite being "indented", is defined at  
global scope, and may be used anywhere in the module.

-- 
Gabriel Genellina



From usenet-nospam at seebs.net  Fri Sep  2 12:42:34 2011
From: usenet-nospam at seebs.net (Seebs)
Date: 02 Sep 2011 16:42:34 GMT
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<4e60fa12$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <slrnj621a4.ubb.usenet-nospam@guild.seebs.net>

On 2011-09-02, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> Roy Smith wrote:
>> I have a function I want to run in a thread and return a value.  It
>> seems like the most obvious way to do this is to have my target
>> function return the value, the Thread object stash that someplace, and
>> return it as the return value for join().

>> Yes, I know there's other ways for a thread to return values (pass the
>> target a queue, for example), but making the return value of the
>> target function available would have been the most convenient.  I'm
>> curious why threading wasn't implemented this way.

> Because then the code launching the thread would have to block, waiting
> until the thread is completed, so it will have a result to return.

Isn't "waiting until the thread is completed" sort of the point of join()?

-s
-- 
Copyright 2011, all wrongs reversed.  Peter Seebach / usenet-nospam at seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
I am not speaking for my employer, although they do rent some of my opinions.


From jehugaleahsa at gmail.com  Fri Sep  2 12:53:37 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 09:53:37 -0700 (PDT)
Subject: Handling 2.7 and 3.0 Versions of Dict
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
	<mailman.710.1314981394.27778.python-list@python.org>
Message-ID: <42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>

On Sep 2, 12:36?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 31 Aug 2011 22:28:09 -0300, Travis Parks <jehugalea... at gmail.com> ?
> escribi :
>
> > On Aug 31, 7:37 pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> >> Ian Kelly wrote:
> >> > if sys.version_info < (3,):
> >> > ? ? getDictValues = dict.itervalues
> >> > else:
> >> > ? ? getDictValues = dict.values
>
> >> > (which is basically what the OP was doing in the first place).
>
> > My problem was that I didn't understand the scoping rules. It is still
> > strange to me that the getValues variable is still in scope outside
> > the if/else branches.
>
> Those if/else are at global scope. An 'if' statement does not introduce a ?
> new scope; so getDictValues, despite being "indented", is defined at ?
> global scope, and may be used anywhere in the module.
>
> --
> Gabriel Genellina
>
>

Does that mean the rules would be different inside a function?


From jehugaleahsa at gmail.com  Fri Sep  2 12:59:03 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 09:59:03 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
Message-ID: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>

Hello:

I am working on an algorithms library. It provides LINQ like
functionality to Python iterators. Eventually, I plan on having
feaures that work against sequences and mappings.

I have the code up at http://code.google.com/p/py-compass.

This is my first project in Python, so I'd like some feedback. I want
to know if I am following conventions (overall style and quality of
code).

Thanks,
Travis Parks


From clp2 at rebertia.com  Fri Sep  2 13:26:15 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 2 Sep 2011 10:26:15 -0700
Subject: convert python List to javascript array
In-Reply-To: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
Message-ID: <CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>

On Fri, Sep 2, 2011 at 8:34 AM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
> Hi !
> Within a web framework, I want want to pass a python sequence (list or
> tuple) to client-side javascript function as an array (javascript
> compatible)
> e.g., I have this list:
> L = ['spam', 'ham', 'eggs', 12, (13.63)]
> What is the correct way to convert L to?javascript array format?
> 1) jsonify the list and pass it to javascript
> (whether json format & javascript array are similar?)

JSON is in fact a subset of JavaScript, and modern browsers now
include a specific API for parsing and generating it
(https://developer.mozilla.org/En/Using_native_JSON ).
Python likewise has a JSON module in the std lib:
http://docs.python.org/library/json.html

> OR
> 2)
>>> import array
>>> y = array.array(i, L)
> ?then return y to javascript function
> But the problem with this method is, it will give an array of basic values
> only.

The word "array" gets tossed around a lot by programmers. The `array`
module is not at all what you want in this case.

Cheers,
Chris
--
http://rebertia.com


From norrisd at bellsouth.net  Fri Sep  2 13:41:32 2011
From: norrisd at bellsouth.net (aMereCat)
Date: Fri, 2 Sep 2011 10:41:32 -0700 (PDT)
Subject: Tenjin and External CSS
Message-ID: <b26fd8f4-1600-4d48-89db-0f302ce9550f@t3g2000vbe.googlegroups.com>

I'm new at Python, Cherrypy and Tenjin and I can't get tenjin to
recognize external css file.  Does anyone have an example showing how
it's done?  Thanks.


From johnroth1 at gmail.com  Fri Sep  2 13:51:14 2011
From: johnroth1 at gmail.com (John Roth)
Date: Fri, 2 Sep 2011 10:51:14 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
	<mailman.658.1314887244.27778.python-list@python.org>
Message-ID: <975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>

On Sep 1, 8:26?am, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Thu, Sep 1, 2011 at 6:45 AM, John Roth <johnro... at gmail.com> wrote:
> > I personally consider this to be a wart. Some time ago I did an
> > implementation analysis. The gist is that, if self and cls were made
> > special variables that returned the current instance and class
> > respectively, then the compiler could determine whether a function was
> > an instance or class method. If it then marked the code object
> > appropriately you could get rid of all of the wrappers and the
> > attendant run-time overhead.
>
> I don't see how you could get rid of the wrappers. ?Methods would
> still need to be bound, somehow, so that code like this will work:
>
> methods = {}
> for obj in objs:
> ? ? if obj.is_flagged:
> ? ? ? ? methods[obj.user_id] = obj.do_work
> ? ? else:
> ? ? ? ? methods[obj.user_id] = obj.do_other_work
> # ...
> methods[some_user_id]()
>
> Without method wrappers, how does the interpreter figure out which
> instance is bound to the method being called?
>
> Cheers,
> Ian

Good question.

Currently the instance wrapper is created during method instantiation,
so the instance is obviously available at that point. There are two
rather obvious ways of remembering it. One is to use the invocation
stack, which has the instance. Another would be for the compiler to
create a local variable for the instance and possibly the class and
fill them in at instantiation time. Both of these require fixing the
names "self" and "cls" so the compiler knows what to do with them. The
first would require giving these two names their own bytecodes, the
second makes them simple local variables the same as the ones in the
method headers. The latter also allows them to be changed by the
method, which is probably not the world's best programming practice
although it's possible now.

John Roth




From askutt at gmail.com  Fri Sep  2 14:01:17 2011
From: askutt at gmail.com (Adam Skutt)
Date: Fri, 2 Sep 2011 11:01:17 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
Message-ID: <5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>

On Sep 2, 10:53?am, Roy Smith <r... at panix.com> wrote:
> I have a function I want to run in a thread and return a value. ?It
> seems like the most obvious way to do this is to have my target
> function return the value, the Thread object stash that someplace, and
> return it as the return value for join().
> > Yes, I know there's other ways for a thread to return values (pass the
> target a queue, for example), but making the return value of the
> target function available would have been the most convenient. ?I'm
> curious why threading wasn't implemented this way.

I assume it is because the underlying operating system APIs do not
support it.  Windows and POSIX threads only support returning an
integer when a thread exits, similar to the exit code of a process.
More importantly, there's no way to tell whether the exit code of a
thread was set by user code or by the system.  Even worse, some of
those integer values are reserved by some operating systems.  If your
thread died via an exception, it still has an error code set by the
operating system.  How would you going to distinguish those codes from
your own?

Adam


From alain at dpt-info.u-strasbg.fr  Fri Sep  2 14:23:28 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Fri, 02 Sep 2011 20:23:28 +0200
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
Message-ID: <87hb4u3isf.fsf@dpt-info.u-strasbg.fr>

Adam Skutt <askutt at gmail.com> writes:

> On Sep 2, 10:53?am, Roy Smith <r... at panix.com> wrote:
>> I have a function I want to run in a thread and return a value. ?It
>> seems like the most obvious way to do this is to have my target
>> function return the value, the Thread object stash that someplace, and
>> return it as the return value for join().
>> > Yes, I know there's other ways for a thread to return values (pass the
>> target a queue, for example), but making the return value of the
>> target function available would have been the most convenient. ?I'm
>> curious why threading wasn't implemented this way.
>
> I assume it is because the underlying operating system APIs do not
> support it.  Windows and POSIX threads only support returning an
> integer when a thread exits, similar to the exit code of a process.

Sorry, you're wrong, at least for POSIX threads:

void pthread_exit(void *value_ptr);
int pthread_join(pthread_t thread, void **value_ptr);

pthread_exit can pass anything, and that value will be retrieved with
pthread_join. Threads of a process share their address space, there is
no reason to restrict their return value to an int.

> More importantly, there's no way to tell whether the exit code of a
> thread was set by user code or by the system.  Even worse, some of
> those integer values are reserved by some operating systems.

I'm not sure what you are talking about here. Maybe you confuse threads
with processes?

Re. the original question: since you can define your own Thread
subclass, with wathever attribute you want, I guess there was no need to
use join() to communicate the result. The Thread's run() can store its
result in an attribute, and the "client" can get it from the same
attribute after a successful call to join().

-- Alain.


From Tim.Arnold at sas.com  Fri Sep  2 14:43:53 2011
From: Tim.Arnold at sas.com (Tim Arnold)
Date: Fri, 02 Sep 2011 14:43:53 -0400
Subject: sqlite3 with context manager
Message-ID: <j3r859$rnt$1@foggy.unx.sas.com>

Hi,
I'm using the 'with' context manager for a sqlite3 connection:

with sqlite3.connect(my.database,timeout=10) as conn:
             conn.execute('update config_build set datetime=?,result=?
where id=?',
                               (datetime.datetime.now(), success,
self.b['id']))

my question is what happens if the update fails? Shouldn't it throw an
exception?

I ask because apparently something went wrong yesterday and the code
never updated but I never got any warning.  I rebooted the machine and
everything is okay now, but I'd like to understand what happened.

thanks,
--Tim


From vinay_sajip at yahoo.co.uk  Fri Sep  2 14:47:33 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 11:47:33 -0700 (PDT)
Subject: ANN: A new version (0.2.8) of the Python module which wraps GnuPG has
	been released.
Message-ID: <d02fd671-a3fe-4056-a706-2bfe2b2d5e2c@a7g2000yqb.googlegroups.com>

A new version of the Python module which wraps GnuPG has been
released.

What Changed?
=============
This is a minor enhancement and bug-fix release. See the project
website ( http://code.google.com/p/python-gnupg/ ) for more
information. Summary:

Better support for status messages from GnuPG.
The fixing of some Unicode encoding problems.
Quoted some command-line arguments to gpg for increased safety.

The current version passes all tests on Windows (CPython 2.4, 2.5,
2.6, 3.1, 2.7 and Jython 2.5.1) and Ubuntu (CPython 2.4, 2.5, 2.6,
2.7, 3.0, 3.1, 3.2). On Windows, GnuPG 1.4.11 has been used for the
tests.

What Does It Do?
================
The gnupg module allows Python programs to make use of the
functionality provided by the Gnu Privacy Guard (abbreviated GPG or
GnuPG). Using this module, Python programs can encrypt and decrypt
data, digitally sign documents and verify digital signatures, manage
(generate, list and delete) encryption keys, using proven Public Key
Infrastructure (PKI) encryption technology based on OpenPGP.

This module is expected to be used with Python versions >= 2.4, as it
makes use of the subprocess module which appeared in that version of
Python. This module is a newer version derived from earlier work by
Andrew Kuchling, Richard Jones and Steve Traugott.

A test suite using unittest is included with the source distribution.

Simple usage:

>>> import gnupg
>>> gpg = gnupg.GPG(gnupghome='/path/to/keyring/directory')
>>> gpg.list_keys()
[{
  ...
  'fingerprint': 'F819EE7705497D73E3CCEE65197D5DAC68F1AAB2',
  'keyid': '197D5DAC68F1AAB2',
  'length': '1024',
  'type': 'pub',
  'uids': ['', 'Gary Gross (A test user) <gary.gr... at gamma.com>']},
 {
  ...
  'fingerprint': '37F24DD4B918CC264D4F31D60C5FEFA7A921FC4A',
  'keyid': '0C5FEFA7A921FC4A',
  'length': '1024',
  ...
  'uids': ['', 'Danny Davis (A test user) <danny.da... at delta.com>']}]
>>> encrypted = gpg.encrypt("Hello, world!", ['0C5FEFA7A921FC4A'])
>>> str(encrypted)
'-----BEGIN PGP MESSAGE-----\nVersion: GnuPG v1.4.9 (GNU/Linux)\n
\nhQIOA/6NHMDTXUwcEAf
...
-----END PGP MESSAGE-----\n'
>>> decrypted = gpg.decrypt(str(encrypted), passphrase='secret')
>>> str(decrypted)
'Hello, world!'
>>> signed = gpg.sign("Goodbye, world!", passphrase='secret')
>>> verified = gpg.verify(str(signed))
>>> print "Verified" if verified else "Not verified"
'Verified'

For more information, visit http://code.google.com/p/python-gnupg/ -
as always, your feedback is most welcome (especially bug reports,
patches and suggestions for improvement). Enjoy!

Cheers

Vinay Sajip
Red Dove Consultants Ltd.


From askutt at gmail.com  Fri Sep  2 14:53:43 2011
From: askutt at gmail.com (Adam Skutt)
Date: Fri, 2 Sep 2011 11:53:43 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
Message-ID: <bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>

On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
wrote:
> Sorry, you're wrong, at least for POSIX threads:
>
> void pthread_exit(void *value_ptr);
> int pthread_join(pthread_t thread, void **value_ptr);
>
> pthread_exit can pass anything, and that value will be retrieved with
> pthread_join.

No, it can only pass a void*, which isn't much better than passing an
int.  Passing a void* is not equivalent to passing anything, not even
in C.  Moreover, specific values are still reserved, like
PTHREAD_CANCELLED. Yes, it was strictly inappropriate for me to say
both return solely integers, but my error doesn't meaningful alter my
description of the situation.  The interface provided by the
underlying APIs is not especially usable for arbitrary data transfer.
Doubly so when we're discussing something like Python's threading
module.

> I'm not sure what you are talking about here. Maybe you confuse threads
> with processes?

Windows threads have exit codes, just like processes.  At least one
code is reserved and cannot be used by the programmer.

Adam


From gagsl-py2 at yahoo.com.ar  Fri Sep  2 15:10:41 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 16:10:41 -0300
Subject: Help required accessing dictionary
References: <54e7c93d35c11cdf72cee56a8a1c5abc@edss.co.in>
Message-ID: <op.v063j3epx6zn5v@lepton>

En Wed, 31 Aug 2011 22:46:54 -0300, <mrinalini at edss.co.in> escribi?:

>  I need to access the dictionary of the script that I am running through
>  my vc++ application by embedding python.
>  I am linking to python dynamically. I want to obtain the dictionary of
>  the script and access the variables declared in the script.
>  However, with the PyObject * that I get from the dictionary, I am not
>  able to find the type of the object. The reason being that
>  GetProcAddress to PyInt_Check returns a NULL. The same thing with
>  PyFloat_Check and so on. I think this is because they are macros and  
>  not
>  exported functions.
>
>  What can be done to be able to perform these checks without statically
>  linking to the pyhon lib ?

Just include python.h
PyInt_Check is completely implemented as a macro, it doesn't call any  
function.

/* from intobject.h */
#define PyInt_Check(op) \
		 PyType_FastSubclass((op)->ob_type, Py_TPFLAGS_INT_SUBCLASS)

/* from object.h */
#define PyType_FastSubclass(t,f)  PyType_HasFeature(t,f)
#define PyType_HasFeature(t,f)  (((t)->tp_flags & (f)) != 0)

-- 
Gabriel Genellina



From fnautaNO at SPAMsolfon.nl  Fri Sep  2 15:12:36 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 21:12:36 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net>
	<mailman.711.1314983727.27778.python-list@python.org>
Message-ID: <9cco6uFvh4U1@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.711.1314983727.27778.python-list at python.org...
> On Fri, 2 Sep 2011 14:19:32 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>
>>
>> In the config file it says:
>> "# main directory
>> directory = \Webdav"
>>
> I think that's the line that should have your e:/wwwroot
> specification
> -- 

Sorry!
It used to have.
But as it did not work, with the same error message, it could not find 
E:\wwwroot, I changed it into \Webdav.
Ofcourse, in the command line as well. Later on I left the D specification 
out in the command line.
Perhaps another drive letter might cause the problem, so in this case I kept 
it on the same partition. But I still got the same error.

Fokke 




From fnautaNO at SPAMsolfon.nl  Fri Sep  2 15:21:03 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 21:21:03 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
Message-ID: <9ccoqkF5efU1@mid.individual.net>


"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:86b084e0-09a8-4997-9e0c-4526d7851e1d at s2g2000vby.googlegroups.com...
On Sep 2, 1:19 pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in 
> messagenews:mailman.687.1314941410.27778.python-list at python.org...
>
> > On Thu, 1 Sep 2011 12:30:43 +0200, "Fokke Nauta"
> > <fnaut... at SPAMsolfon.nl> declaimed the following in
> > gmane.comp.python.general:
>
> >> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in message
> >>news:mailman.643.1314851358.27778.python-list at python.org...
>
> >> > Next, if you'd read further and didn't take the comment as the
> >> > instruction. set
> >> > firstrun=1
>
> >> I did
>
> >> > to tell the server this is the first time it is being run - IT WILL
> >> > create the database table (after the first start, reset the flag to 0
> >> > to
> >> > speed up later runs).
>
> >> It didn't create the table. The database kept empty.
>
> > Odd -- but then, I'm not running it myself, and wasn't up to reading
> > all the code to see what path it takes.
>
> It's only for experimenting with calendar software, so authorization is 
> not
> a point.
> So I forget about MySQL.
> >> > Later in the config file set
> >> > mysql_auth=1
> >> > to enable the use of MySQL, and set the admin user/password to what 
> >> > you
> >> > plan to have it use.
>
> >> I did
>
> >> > You probably want to set
> >> > daemonize=1
> >> > (maybe after first run)
>
> >> I left this to 0.
>
> >> > Oh, and don't forget to set the main data directory and any
> >> > port/host changes.
>
> >> I left host and port as they were. The main directory is e:\wwwroot
>
> >> > Start the server - it should connect to MySQL, create the table, and
> >> > add the admin user to the table.
>
> >> I started the server with server.py (in
> >> D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini
>
> > If the main directory is already in the config file, you probably
> > don't need to specify it on the command line...
>
> OK
>
> > And... could there be
> > something in the code where overriding the directory by command line
> > changes where it looks for the config file? (Just guessing at this
> > point).
>
> Possibly.
> I tried this:
> server.py -n -c config.ini
> Once again, the server is up and running and when I am logging in with my
> browser (10.0.0.140:8081) I can see information showing up at the command
> prompt, showing somebody is logging is, but the same error:
> "fshandler:get_data: \Webdav not found". During starting up the server
> mentioned: "pywebdav:Serving data from \Webdav".
>
> In the config file it says:
> "# main directory
> directory = \Webdav"
>
> Perhaps my Python configuration is at fault.
>
> Fokke

Is the path supposed to be absolute? In which case you'd need to have:
directory=C:\path\to\Webdav

instead of just
directory=\Webdav

I tried:
directory=D:\Webdav
directory=D:/Webdav

To no avail.
It didn.t make any difference.

I surely believe my WebDAV installation is at fault.

Fokke




From fnautaNO at SPAMsolfon.nl  Fri Sep  2 15:24:02 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 21:24:02 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net>
	<mailman.703.1314969082.27778.python-list@python.org>
Message-ID: <9ccoqkF5efU2@mid.individual.net>

<python at bdurham.com> wrote in message 
news:mailman.703.1314969082.27778.python-list at python.org...
> Hi Fokke,
>
> Disclaimer: I have no experience with the Python WebDAV package you're
> using.
>
> But a thought:
>
>> In the config file it says:
>> "# main directory
>> directory = \Webdav"
>
> Perhaps you should qualify your directory path with a drive letter?
>
> I would try this 2 ways:
>
> directory = E:\Webdav
>
> And if that doesn't work:
>
> directory = E:/Webdav
>
> My thinking about the 2nd example is that perhaps the \W is getting
> interpreted as a control character vs. "backslash" "W".
>

I tried:
directory=D:\Webdav
directory=D:/Webdav

To no avail.
It didn't make any difference.

I surely believe my WebDAV installation is at fault.

And D: is the same partition as where Python is, D:\Python27

Fokke





From guido at python.org  Fri Sep  2 15:30:34 2011
From: guido at python.org (Guido van Rossum)
Date: Fri, 2 Sep 2011 12:30:34 -0700
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>

On Fri, Sep 2, 2011 at 12:28 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:
> Gabriel AHTUNE writes:
> ?> So can be done with this syntax:
> ?>
> ?> > x = firstpart * secondpart ?+ ?#line breaks here
> ?> > anotherpart + #continue
> ?> > stillanother #continue on.
> ?>
> ?> after a "+" operator the line is clearly not finished yet.
>
> Sure, but IIRC one design principle of Python is that the keyword that
> denotes the syntax should be the first thing on the line, making it
> easy to scan down the left side of the code to see the syntactic
> structure. ?The required indentation of the controlled suite also
> helps emphasize that keyword.

That's true for *statements* (except assignments and calls).

> Analogously, if operators are going to denote continuation, they
> should come first on the line.

That doesn't follow. My preferred style is actually to put the binary
operator at the end of the line. This also matches the prevailing
style for breaking lines after commas (a comma can be seen as a kind
of binary operator).

> I just don't think this idea is going anywhere. ?Explicit continuation
> with backslash or implicit continuation of parenthesized expressions
> is just not that heavy a price to pay. ?Perhaps historically some of
> these ideas could have been implemented, but now they're just going to
> confuse a host of editors and code analysis tools.

Totally agreed that this isn't going to happen.

-- 
--Guido van Rossum (python.org/~guido)


From sahil at FreeBSD.org  Fri Sep  2 15:56:46 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Fri, 02 Sep 2011 15:56:46 -0400
Subject: idiomatic analogue of Perl's: while (<>) { ... }
In-Reply-To: <j3pp0q$6n4$1@dough.gmane.org>
References: <20110901045650.GA3466@magic.hamla.org>
	<j3pp0q$6n4$1@dough.gmane.org>
Message-ID: <4E6134FE.9060309@FreeBSD.org>

Dennis Lee Bieber wrote:
> On Thu, 1 Sep 2011 00:56:50 -0400, Sahil Tandon<sahil at FreeBSD.org>
>> # process input, line-by-line, and print responses after parsing input
>> while 1:
>>    rval = parse(raw_input())
>>    if rval == None:
>
> 	There is only ONE "None" object so the preferred method is
>
> 	if rval is None:

Understood; thanks for that enlightenment.

> 	Note: I don't see any exit handler/condition...

Indeed.  I excluded such things in the interest of brevity, to focus the 
discussion on my question. :)

-- 
Sahil Tandon <sahil at FreeBSD.org>



From gagsl-py2 at yahoo.com.ar  Fri Sep  2 16:06:57 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 17:06:57 -0300
Subject: Invoking profile from command line prevent my sys.path
	modification
References: <CAFEUn8YAG5P92XTHaubMuX_NFG0b28+yhFkR3yf2QxQ4u5gFpQ@mail.gmail.com>
Message-ID: <op.v0655vaux6zn5v@lepton>

En Thu, 01 Sep 2011 07:51:43 -0300, Ya?ar Arabac? <yasar11732 at gmail.com>  
escribi?:

> I am new to profile module, so I am sorry if this is an absolute beginner
> question. In order to my code to run, I need to add a directory to  
> sys.path.
> When I invole python -m profile myfile.py, my code won't work, saying  
> that
> the thing that is supposed to be in path, isn't. Code works fine without
> profiling. Profiling works if I write it into the file, but I don't  
> prefer
> doing that, if that is possible.

You may set the PYTHONPATH environment variable, just for the profiling  
session.

http://docs.python.org/install/index.html#modifying-python-s-search-path

-- 
Gabriel Genellina



From ian.g.kelly at gmail.com  Fri Sep  2 16:09:26 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 2 Sep 2011 14:09:26 -0600
Subject: Algorithms Library - Asking for Pointers
In-Reply-To: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
Message-ID: <CALwzid=og0t+JP5xgkfXEyz+s+GkVEULOqgE0gTk_Fhrcqotmw@mail.gmail.com>

On Fri, Sep 2, 2011 at 10:59 AM, Travis Parks <jehugaleahsa at gmail.com> wrote:
> Hello:
>
> I am working on an algorithms library. It provides LINQ like
> functionality to Python iterators. Eventually, I plan on having
> feaures that work against sequences and mappings.
>
> I have the code up at http://code.google.com/p/py-compass.
>
> This is my first project in Python, so I'd like some feedback. I want
> to know if I am following conventions (overall style and quality of
> code).

Sure, here are my comments.

In the "forever" and "__forever" functions, your use of the term
"generator" is confusing.  "__forever" is a generator function,
because it has a yield statement.  Its argument, called "generator",
appears to be a callable, not a generator or even necessarily a
generator function.  Also, note that __forever(lambda: value) is
functionally equivalent to the more efficient itertools.repeat(value).

The staticmethod __next(iterator) accesses the class it is defined in,
which suggests that it might be better written as a classmethod
__next(cls, iterator).

Each of the LINQ-style methods is divided into two parts: the public
method that contains the docstring and some argument checks, and a
private staticmethod that contains the implementation.  I'm not
certain what the purpose of that is.  If it's to facilitate overriding
the implementation in subclasses, then you need to change the names of
the private methods to start with only one _ character so that they
won't be mangled by the compiler.

The comments before each method that only contain the name of the
immediately following method are redundant.

aggregate: the default aggregator is unintuitive to me.  I would make
it a required field and add a separate method called sum that calls
aggregate with the operator.add aggregator.
Also, the implementation doesn't look correct.  Instead of passing in
each item to the aggregator, you're passing in the number of items
seen so far?  The LINQ Aggregate method is basically reduce, so rather
than reinvent the wheel I would suggest this:

# MISSING is a unique object solely defined to represent missing arguments.
# Unlike None we can safely assume it will never be passed as actual data.
MISSING = object()

def aggregate(self, aggregator, seed=MISSING):
    if seed is self.MISSING:
        return reduce(aggregator, self._iterable)
    else:
        return reduce(aggregator, self._iterable, seed)

Note for compatibility that in Python 3 the reduce function has been
demoted from a builtin to a member of the functools module.

any: the name of this method could cause some confusion with the "any"
builtin that does something a bit different.

compare: the loop would more DRY as a for loop:

def __compare(first, second, comparison):
    for firstval, secondval in itertools.izip_longest(first, second,
fillvalue=self.MISSING):
        if firstval is self.MISSING:
            return -1
        elif secondval is self.MISSING:
            return 1
        else:
            result = comparison(firstval, secondval)
            if result != 0:
                return result
    return 0

concatenate: again, no need to reinvent the wheel.  This should be
more efficient:

def concatenate(self, other):
    return extend(itertools.chain(self.__iterable, other))

equals: could be just "return self.compare(other, comparison) == 0"

__last: the loop could be a for loop:

        # assume we're looking at the last item and try moving to the next
        item = result.Value
        for item in iterator: pass
        return item

lastOrDefault: there's a lot of repeated logic here.  This could just be:

def lastOrDefault(self, default=None):
    try:
        return self.last()
    except ValueError:
        return default

map / forEach: .NET has to separate these into separate methods due to
static typing.  It seems a bit silly to have both of them in Python.
Also, map would be more efficient as "return itertools.imap(mapper,
self.__iterable)"

max / min: it would be more efficient to use the builtin:
def max(self, key):
    return max(self.__iterable, key=key)
If somebody really needs to pass a comparison function instead of a
key function, they can use functools.cmp_to_key.

randomSamples: a more canonical way to pass the RNG would be to pass
an instance of random.Random rather than an arbitrary function. Then
to get a random integer you can just call generator.randrange(total).
Note that for the default you can just use the random module itself,
which provides default implementations of all the Random methods.
Also, for loops:

    def __randomSamples(iterable, sampleCount, generator):
        samples = []
        iterator = iter(iterable)
        # fill up the samples with the items from the beginning of the iterable
        for i, value in zip(xrange(sampleCount), iterator):
            samples.append(value)
        # replace items if the generated number is less than the total
        total = len(samples)
        for value in iterator:
            total += 1
            index = generator.randrange(total)
            if index < len(samples):
                samples[index] = result
        return samples

__reverse: you could just "return reversed(list(iterable))"

__rotateLeft:
def __rotateLeft(iterable, shift):
    iterator = iter(iterable)
    front = list(itertools.islice(iterator, shift))
    return itertools.chain(iterator, front)

skipWhile: suggest using itertools.dropwhile
take: suggest using itertools.islice
takeWhile: suggest using itertools.takewhile
__toList: "return list(iterable)"
__toSet: "return set(iterable)"
__toTuple: "return tuple(iterable)".  Note that as currently written
this actually returns a generator, not a tuple.
__where: suggest using itertools.ifilter
__zip: suggest using a for loop over itertools.izip(first, second)

Lookup: is inconsistent.  The overridden __iter__ method returns an
iterator over the values of the groups, but all the inherited methods
are going to iterate over the keys.  Probably you want to pass
groups.values() to the superclass __init__ method.

Cheers,
Ian


From nospam at torek.net  Fri Sep  2 16:14:56 2011
From: nospam at torek.net (Chris Torek)
Date: 2 Sep 2011 20:14:56 GMT
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
Message-ID: <j3rdg00fmp@news6.newsguy.com>

>On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
>wrote:
>> Sorry, you're wrong, at least for POSIX threads:
>>
>> void pthread_exit(void *value_ptr);
>> int pthread_join(pthread_t thread, void **value_ptr);
>>
>> pthread_exit can pass anything, and that value will be retrieved with
>> pthread_join.

In article <bf50c8e1-1476-41e1-b2bc-61e329bfa5be at s12g2000yqm.googlegroups.com>
Adam Skutt  <askutt at gmail.com> wrote:
>No, it can only pass a void*, which isn't much better than passing an
>int.

It is far better than passing an int, although it leaves you with
an annoying storage-management issue, and sidesteps any reasonable
attempts at type-checking (both of which are of course "par for
the course" in C).  For instance:

    struct some_big_value {
        ... lots of stuff ...
    };
    struct some_big_value storage_management_problem[SIZE];
    ...
    void *func(void *initial_args) {
        ...
    #ifdef ONE_WAY_TO_DO_IT
        pthread_exit(&storage_management_problem[index]);
        /* NOTREACHED */
    #else /* the other way */
        return &storage_management_problem[index];
    #endif
    }
    ...
        int error;
        pthread_t threadinfo;
        pthread_attr_t attr;
        ...
        pthread_attr_init(&attr);
        /* set attributes if desired */
        error = pthread_create(&threadinfo, &attr, func, &args_to_func);
        if (error) {
            ... handle error ...
        } else {
            ...
            void *rv;
            result = pthread_join(&threadinfo, &rv);
            if (rv == PTHREAD_CANCELED) {
                ... the thread was canceled ...
            } else {
                struct some_big_value *ret = rv;
                ... work with ret->field ...
            }
        }

(Or, do dynamic allocation, and have a struct with a distinguishing
ID followed by a union of multiple possible values, or a flexible
array member, or whatever.  This means you can pass any arbitrary
data structure back, provided you can manage the storage somehow.)

>Passing a void* is not equivalent to passing anything, not even
>in C.  Moreover, specific values are still reserved, like
>PTHREAD_CANCELLED.

Some manual pages are clearer about this than others.  Here is one
that I think is not bad:

    The symbolic constant PTHREAD_CANCELED expands to a constant
    expression of type (void *), whose value matches no pointer to
    an object in memory nor the value NULL.

So, provided you use pthread_exit() "correctly" (always pass either
NULL or the address of some actual object in memory), the special
reserved value is different from all of "your" values.

(POSIX threads are certainly klunky, but not all *that* badly designed
given the constraints.)

>>Re. the original question: since you can define your own Thread
>>subclass, with wathever attribute you want, I guess there was no need to
>>use join() to communicate the result. The Thread's run() can store its
>>result in an attribute, and the "client" can get it from the same
>>attribute after a successful call to join().

For that matter, you can use the following to get what the OP asked
for.  (Change all the instance variables to __-prefixed versions
if you want them to be Mostly Private.)

import threading

class ValThread(threading.Thread):
    "like threading.Thread, but the target function's return val is captured"
    def __init__(self, group=None, target=None, name=None,
            args=(), kwargs=None, verbose=None):
        super(ValThread, self).__init__(group, None, name, None, None, verbose)
        self.value = None
        self.target = target
        self.args = args
        self.kwargs = {} if kwargs is None else kwargs

    def run(self):
        "run the thread"
        if self.target:
            self.value = self.target(*self.args, **self.kwargs)

    def join(self, timeout = None):
        "join, then return value set by target function"
        super(ValThread, self).join(timeout)
        return self.value
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From tjreedy at udel.edu  Fri Sep  2 16:22:35 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 02 Sep 2011 16:22:35 -0400
Subject: Handling 2.7 and 3.0 Versions of Dict
In-Reply-To: <42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
	<mailman.710.1314981394.27778.python-list@python.org>
	<42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>
Message-ID: <j3rdvq$hns$1@dough.gmane.org>

On 9/2/2011 12:53 PM, Travis Parks wrote:
> On Sep 2, 12:36 pm, "Gabriel Genellina"<gagsl-... at yahoo.com.ar>

>> Those if/else are at global scope. An 'if' statement does not introduce a
>> new scope; so getDictValues, despite being "indented", is defined at
>> global scope, and may be used anywhere in the module.

> Does that mean the rules would be different inside a function?

Yes. Inside a function, you would have to add
     global getDictValues
before the if statement in order for the assignments to have global effect.

-- 
Terry Jan Reedy



From gagsl-py2 at yahoo.com.ar  Fri Sep  2 16:29:59 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 17:29:59 -0300
Subject: Handling 2.7 and 3.0 Versions of Dict
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
	<mailman.710.1314981394.27778.python-list@python.org>
	<42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>
Message-ID: <op.v06679kex6zn5v@lepton>

En Fri, 02 Sep 2011 13:53:37 -0300, Travis Parks <jehugaleahsa at gmail.com>  
escribi?:

> On Sep 2, 12:36 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 31 Aug 2011 22:28:09 -0300, Travis Parks  
>> <jehugalea... at gmail.com> escribi :
>>
>> > On Aug 31, 7:37 pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> >> Ian Kelly wrote:
>> >> > if sys.version_info < (3,):
>> >> >     getDictValues = dict.itervalues
>> >> > else:
>> >> >     getDictValues = dict.values
>>
>> >> > (which is basically what the OP was doing in the first place).
>>
>> > My problem was that I didn't understand the scoping rules. It is still
>> > strange to me that the getValues variable is still in scope outside
>> > the if/else branches.
>>
>> Those if/else are at global scope. An 'if' statement does not introduce  
>> a new scope; so getDictValues, despite being "indented", is defined at  
>> global scope, and may be used anywhere in the module.
>
> Does that mean the rules would be different inside a function?

Yes: a function body *does* create a new scope, as well as the class  
statement. See
http://docs.python.org/reference/executionmodel.html

-- 
Gabriel Genellina



From ian.g.kelly at gmail.com  Fri Sep  2 16:30:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 2 Sep 2011 14:30:14 -0600
Subject: Why do class methods always need 'self' as the first parameter?
In-Reply-To: <975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
	<mailman.658.1314887244.27778.python-list@python.org>
	<975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>
Message-ID: <CALwzidmxpPUYZx3Tx5DZFHL8m_sAu4mL8t3uneepyk+ep6vOiw@mail.gmail.com>

On Fri, Sep 2, 2011 at 11:51 AM, John Roth <johnroth1 at gmail.com> wrote:
>> I don't see how you could get rid of the wrappers. ?Methods would
>> still need to be bound, somehow, so that code like this will work:
>>
>> methods = {}
>> for obj in objs:
>> ? ? if obj.is_flagged:
>> ? ? ? ? methods[obj.user_id] = obj.do_work
>> ? ? else:
>> ? ? ? ? methods[obj.user_id] = obj.do_other_work
>> # ...
>> methods[some_user_id]()
>>
>> Without method wrappers, how does the interpreter figure out which
>> instance is bound to the method being called?
>>
>> Cheers,
>> Ian
>
> Good question.
>
> Currently the instance wrapper is created during method instantiation,
> so the instance is obviously available at that point. There are two
> rather obvious ways of remembering it. One is to use the invocation
> stack, which has the instance. Another would be for the compiler to
> create a local variable for the instance and possibly the class and
> fill them in at instantiation time. Both of these require fixing the
> names "self" and "cls" so the compiler knows what to do with them. The
> first would require giving these two names their own bytecodes, the
> second makes them simple local variables the same as the ones in the
> method headers. The latter also allows them to be changed by the
> method, which is probably not the world's best programming practice
> although it's possible now.

That's not what I asked.  Both of those options are storing the
instance within a stack frame, once it's been called.  I'm asking how
you would remember the instance during the interval from the time when
the method
is accessed until when it has been called.

In the code above, the method is accessed just before it is stored in
the dictionary.  That is when the method wrapper is currently created,
and the instance is available.  It is not called until much later,
possibly not even within the same function.  How would you remember
the instance over that period without wrapping the function?

Cheers,
Ian


From steve+comp.lang.python at pearwood.info  Fri Sep  2 16:49:17 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 03 Sep 2011 06:49:17 +1000
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<4e60fa12$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<slrnj621a4.ubb.usenet-nospam@guild.seebs.net>
Message-ID: <4e61414e$0$29994$c3e8da3$5496439d@news.astraweb.com>

Seebs wrote:

> On 2011-09-02, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
[...]
>> Because then the code launching the thread would have to block, waiting
>> until the thread is completed, so it will have a result to return.
> 
> Isn't "waiting until the thread is completed" sort of the point of join()?

Doh!

I mean, well done, you have passed my little test!

<wink>



-- 
Steven



From rosuav at gmail.com  Fri Sep  2 17:47:54 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 3 Sep 2011 07:47:54 +1000
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <d5a699af-83ae-48ca-b32c-3aedc4a96d2a@s2g2000prm.googlegroups.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<d5a699af-83ae-48ca-b32c-3aedc4a96d2a@s2g2000prm.googlegroups.com>
Message-ID: <CAPTjJmovMvun9UYWCWHvDbequFN=aAWpBo8aCtB2eAWKT+LyHA@mail.gmail.com>

On Sat, Sep 3, 2011 at 2:26 AM, Den <patentsvnc at gmail.com> wrote:
> I've been doing some more thinking on what I want. ?This may be a
> better explanation. ?Is there a way of detecting if my program has
> lost "focus" (I'm not sure the correct term)? ?For example, if someone
> is typing in my program, but some other program takes control (or CAD
> has been pressed) I would like simply to log that. ?I have no interest
> in trying to hijack or interfere with anything, simply log it.

Ah, then yes most definitely! If you're writing a GUI program, a
LostFocus event is a normal thing to be able to catch.

Now, if you're writing a console program, that mightn't be so easy.
But certainly you can detect loss of focus to any window that you
control.

ChrisA


From askutt at gmail.com  Fri Sep  2 18:02:08 2011
From: askutt at gmail.com (Adam Skutt)
Date: Fri, 2 Sep 2011 15:02:08 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
	<j3rdg00fmp@news6.newsguy.com>
Message-ID: <2c0123f1-f776-45af-b39e-a802f2009e7d@y21g2000yqy.googlegroups.com>

On Sep 2, 4:14?pm, Chris Torek <nos... at torek.net> wrote:
> In article <bf50c8e1-1476-41e1-b2bc-61e329bfa... at s12g2000yqm.googlegroups.com>
> Adam Skutt ?<ask... at gmail.com> wrote:
>
> >No, it can only pass a void*, which isn't much better than passing an
> >int.
>
> It is far better than passing an int, although it leaves you with
> an annoying storage-management issue, and sidesteps any reasonable
> attempts at type-checking (both of which are of course "par for
> the course" in C).

And when written out, makes it sound distinctly worse than passing an
int :p.  And let's not kid ourselves, unless you're a C programmer, it
is distinctly worse than passing an int.  Heck, your example (snipped)
goes out of your way to unnecessarily leverage the functionality
provided by pthreads.

> Some manual pages are clearer about this than others. ?Here is one
> that I think is not bad:
>
> ? ? The symbolic constant PTHREAD_CANCELED expands to a constant
> ? ? expression of type (void *), whose value matches no pointer to
> ? ? an object in memory nor the value NULL.
>
> So, provided you use pthread_exit() "correctly" (always pass either
> NULL or the address of some actual object in memory), the special
> reserved value is different from all of "your" values.

Unfortunately, I'm not sure all implementations behave that way.  Not
that cancellation is really worth bothering with anyway, but it's a
pretty nasty corner case.

Adam


From johnroth1 at gmail.com  Fri Sep  2 18:30:35 2011
From: johnroth1 at gmail.com (John Roth)
Date: Fri, 2 Sep 2011 15:30:35 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
	<mailman.658.1314887244.27778.python-list@python.org>
	<975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>
	<mailman.721.1314995446.27778.python-list@python.org>
Message-ID: <d65b4506-f33d-4a79-87fd-4f3d74d89fa7@e34g2000prn.googlegroups.com>

On Sep 2, 2:30?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Fri, Sep 2, 2011 at 11:51 AM, John Roth <johnro... at gmail.com> wrote:
> >> I don't see how you could get rid of the wrappers. ?Methods would
> >> still need to be bound, somehow, so that code like this will work:
>
> >> methods = {}
> >> for obj in objs:
> >> ? ? if obj.is_flagged:
> >> ? ? ? ? methods[obj.user_id] = obj.do_work
> >> ? ? else:
> >> ? ? ? ? methods[obj.user_id] = obj.do_other_work
> >> # ...
> >> methods[some_user_id]()
>
> >> Without method wrappers, how does the interpreter figure out which
> >> instance is bound to the method being called?
>
> >> Cheers,
> >> Ian
>
> > Good question.
>
> > Currently the instance wrapper is created during method instantiation,
> > so the instance is obviously available at that point. There are two
> > rather obvious ways of remembering it. One is to use the invocation
> > stack, which has the instance. Another would be for the compiler to
> > create a local variable for the instance and possibly the class and
> > fill them in at instantiation time. Both of these require fixing the
> > names "self" and "cls" so the compiler knows what to do with them. The
> > first would require giving these two names their own bytecodes, the
> > second makes them simple local variables the same as the ones in the
> > method headers. The latter also allows them to be changed by the
> > method, which is probably not the world's best programming practice
> > although it's possible now.
>
> That's not what I asked. ?Both of those options are storing the
> instance within a stack frame, once it's been called. ?I'm asking how
> you would remember the instance during the interval from the time when
> the method
> is accessed until when it has been called.
>
> In the code above, the method is accessed just before it is stored in
> the dictionary. ?That is when the method wrapper is currently created,
> and the instance is available. ?It is not called until much later,
> possibly not even within the same function. ?How would you remember
> the instance over that period without wrapping the function?
>
> Cheers,
> Ian

I see what you're saying now - I didn't get your example the first
time. So the optimization of eliminating the instance wrapper is only
possible if it's retrieved via the instance and then called
immediately. That would seem to be a useful optimization if it was
possible - I wonder if PyPy is doing it since they've got that fancy
JIT, and it would seem that an immediate call after retrieving the
method is overwhelmingly more frequent than saving it for later.

I think it's still true that calling the underlying function object
through the instance wrapper requires remaking the parameter list,
which seems to be another piece of unnecessary overhead, unless
there's a fast path through the call machinery that treats the
instance specially.

It does, however, decouple the two issues so I can't claim the
optimization as a benefit. Drat.

John Roth


From jehugaleahsa at gmail.com  Fri Sep  2 18:49:03 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 15:49:03 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
Message-ID: <8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>

On Sep 2, 4:09?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Fri, Sep 2, 2011 at 10:59 AM, Travis Parks <jehugalea... at gmail.com> wrote:
> > Hello:
>
> > I am working on an algorithms library. It provides LINQ like
> > functionality to Python iterators. Eventually, I plan on having
> > feaures that work against sequences and mappings.
>
> > I have the code up athttp://code.google.com/p/py-compass.
>
> > This is my first project in Python, so I'd like some feedback. I want
> > to know if I am following conventions (overall style and quality of
> > code).
>
> Sure, here are my comments.
>
> In the "forever" and "__forever" functions, your use of the term
> "generator" is confusing. ?"__forever" is a generator function,
> because it has a yield statement. ?Its argument, called "generator",
> appears to be a callable, not a generator or even necessarily a
> generator function. ?Also, note that __forever(lambda: value) is
> functionally equivalent to the more efficient itertools.repeat(value).
>
> The staticmethod __next(iterator) accesses the class it is defined in,
> which suggests that it might be better written as a classmethod
> __next(cls, iterator).
>
> Each of the LINQ-style methods is divided into two parts: the public
> method that contains the docstring and some argument checks, and a
> private staticmethod that contains the implementation. ?I'm not
> certain what the purpose of that is. ?If it's to facilitate overriding
> the implementation in subclasses, then you need to change the names of
> the private methods to start with only one _ character so that they
> won't be mangled by the compiler.
>
> The comments before each method that only contain the name of the
> immediately following method are redundant.
>
> aggregate: the default aggregator is unintuitive to me. ?I would make
> it a required field and add a separate method called sum that calls
> aggregate with the operator.add aggregator.
> Also, the implementation doesn't look correct. ?Instead of passing in
> each item to the aggregator, you're passing in the number of items
> seen so far? ?The LINQ Aggregate method is basically reduce, so rather
> than reinvent the wheel I would suggest this:
>
> # MISSING is a unique object solely defined to represent missing arguments.
> # Unlike None we can safely assume it will never be passed as actual data.
> MISSING = object()
>
> def aggregate(self, aggregator, seed=MISSING):
> ? ? if seed is self.MISSING:
> ? ? ? ? return reduce(aggregator, self._iterable)
> ? ? else:
> ? ? ? ? return reduce(aggregator, self._iterable, seed)
>
> Note for compatibility that in Python 3 the reduce function has been
> demoted from a builtin to a member of the functools module.
>
> any: the name of this method could cause some confusion with the "any"
> builtin that does something a bit different.
>
> compare: the loop would more DRY as a for loop:
>
> def __compare(first, second, comparison):
> ? ? for firstval, secondval in itertools.izip_longest(first, second,
> fillvalue=self.MISSING):
> ? ? ? ? if firstval is self.MISSING:
> ? ? ? ? ? ? return -1
> ? ? ? ? elif secondval is self.MISSING:
> ? ? ? ? ? ? return 1
> ? ? ? ? else:
> ? ? ? ? ? ? result = comparison(firstval, secondval)
> ? ? ? ? ? ? if result != 0:
> ? ? ? ? ? ? ? ? return result
> ? ? return 0
>
> concatenate: again, no need to reinvent the wheel. ?This should be
> more efficient:
>
> def concatenate(self, other):
> ? ? return extend(itertools.chain(self.__iterable, other))
>
> equals: could be just "return self.compare(other, comparison) == 0"
>
> __last: the loop could be a for loop:
>
> ? ? ? ? # assume we're looking at the last item and try moving to the next
> ? ? ? ? item = result.Value
> ? ? ? ? for item in iterator: pass
> ? ? ? ? return item
>
> lastOrDefault: there's a lot of repeated logic here. ?This could just be:
>
> def lastOrDefault(self, default=None):
> ? ? try:
> ? ? ? ? return self.last()
> ? ? except ValueError:
> ? ? ? ? return default
>
> map / forEach: .NET has to separate these into separate methods due to
> static typing. ?It seems a bit silly to have both of them in Python.
> Also, map would be more efficient as "return itertools.imap(mapper,
> self.__iterable)"
>
> max / min: it would be more efficient to use the builtin:
> def max(self, key):
> ? ? return max(self.__iterable, key=key)
> If somebody really needs to pass a comparison function instead of a
> key function, they can use functools.cmp_to_key.
>
> randomSamples: a more canonical way to pass the RNG would be to pass
> an instance of random.Random rather than an arbitrary function. Then
> to get a random integer you can just call generator.randrange(total).
> Note that for the default you can just use the random module itself,
> which provides default implementations of all the Random methods.
> Also, for loops:
>
> ? ? def __randomSamples(iterable, sampleCount, generator):
> ? ? ? ? samples = []
> ? ? ? ? iterator = iter(iterable)
> ? ? ? ? # fill up the samples with the items from the beginning of the iterable
> ? ? ? ? for i, value in zip(xrange(sampleCount), iterator):
> ? ? ? ? ? ? samples.append(value)
> ? ? ? ? # replace items if the generated number is less than the total
> ? ? ? ? total = len(samples)
> ? ? ? ? for value in iterator:
> ? ? ? ? ? ? total += 1
> ? ? ? ? ? ? index = generator.randrange(total)
> ? ? ? ? ? ? if index < len(samples):
> ? ? ? ? ? ? ? ? samples[index] = result
> ? ? ? ? return samples
>
> __reverse: you could just "return reversed(list(iterable))"
>
> __rotateLeft:
> def __rotateLeft(iterable, shift):
> ? ? iterator = iter(iterable)
> ? ? front = list(itertools.islice(iterator, shift))
> ? ? return itertools.chain(iterator, front)
>
> skipWhile: suggest using itertools.dropwhile
> take: suggest using itertools.islice
> takeWhile: suggest using itertools.takewhile
> __toList: "return list(iterable)"
> __toSet: "return set(iterable)"
> __toTuple: "return tuple(iterable)". ?Note that as currently written
> this actually returns a generator, not a tuple.
> __where: suggest using itertools.ifilter
> __zip: suggest using a for loop over itertools.izip(first, second)
>
> Lookup: is inconsistent. ?The overridden __iter__ method returns an
> iterator over the values of the groups, but all the inherited methods
> are going to iterate over the keys. ?Probably you want to pass
> groups.values() to the superclass __init__ method.
>
> Cheers,
> Ian

Awesome tips. I appreciate the time you spent commenting on just about
every function. I really like your suggestions about using itertools
more, and for loops. I was feeling like some things were becoming way
too complicated.

I also noted the bugs you discovered. I will incorporate your
suggestions.

Thanks again!


From vinay_sajip at yahoo.co.uk  Fri Sep  2 18:59:31 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 15:59:31 -0700 (PDT)
Subject: Making `logging.basicConfig` log to *both* `sys.stderr` and
	`sys.stdout`?
References: <7f46ab8f-710c-4463-a072-fa80c49f90de@ea4g2000vbb.googlegroups.com>
Message-ID: <34939e5a-19ba-4cc5-b10b-36f8b2e42830@h9g2000vbr.googlegroups.com>

On Aug 30, 9:53?am, Michel Albert <exh... at gmail.com> wrote:


> Unfortunately this setup makes `logging.basicConfig` pretty useless.
> However, I believe that this is something that more people could
> benefit from. I also believe, that it just "makes sense" to send
> warnings (and above) to `stderr`, the rest to `stdout`.
>
> So I was thinking: "Why does `logging.basicConfig` not behave that
> way".

Because what seems entirely natural and obvious to you might not seem
so for someone else. The API in the stdlib tries to provide baseline
functionality which others can build on. For example, if you always
have a particular pattern which you use, you can always write a
utility function to set things up exactly how you like, and others who
want to set things up differently (for whatever reason) can do the
same thing, without having to come into conflict (if that's not too
strong a word) with views different from their own.

> Naturally, I was thinking of writing a patch against the python
> codebase and submit it as a suggestion. But before doing so, I would
> like to hear your thoughts on this. Does it make sense to you too or
> am I on the wrong track? Are there any downsides I am missing?

Python 2.x is closed to feature changes, and Python 2.7 and Python 3.2
already support flexible configuration using dictConfig() - see

http://docs.python.org/library/logging.config.html#logging.config.dictConfig

Also, Python 3.3 will support passing a list of handlers to
basicConfig(): see

http://plumberjack.blogspot.com/2011/04/added-functionality-for-basicconfig-in.html

which will allow you to do what you want quite easily.

Regards,

Vinay Sajip


From roy at panix.com  Fri Sep  2 19:16:29 2011
From: roy at panix.com (Roy Smith)
Date: Fri, 02 Sep 2011 19:16:29 -0400
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
Message-ID: <roy-030914.19162802092011@news.panix.com>

In article 
<5da6bf87-9412-46c4-ad32-f8337d56b2c3 at o15g2000vbe.googlegroups.com>,
 Adam Skutt <askutt at gmail.com> wrote:

> On Sep 2, 10:53?am, Roy Smith <r... at panix.com> wrote:
> > I have a function I want to run in a thread and return a value. ?It
> > seems like the most obvious way to do this is to have my target
> > function return the value, the Thread object stash that someplace, and
> > return it as the return value for join().
> > > Yes, I know there's other ways for a thread to return values (pass the
> > target a queue, for example), but making the return value of the
> > target function available would have been the most convenient. ?I'm
> > curious why threading wasn't implemented this way.
> 
> I assume it is because the underlying operating system APIs do not
> support it.  Windows and POSIX threads only support returning an
> integer when a thread exits, similar to the exit code of a process.

But the whole point of higher level languages is to hide the warts of 
the lower-level APIs they are built on top of.  Just because a POSIX 
thread can only return an int (actually, a void *) doesn't mean that 
level of detail needed to be exposed at the Python threading library 
level.

> More importantly, there's no way to tell whether the exit code of a
> thread was set by user code or by the system.  Even worse, some of
> those integer values are reserved by some operating systems.  If your
> thread died via an exception, it still has an error code set by the
> operating system.  How would you going to distinguish those codes from
> your own?

I think you're talking about processes, not threads, but in any case, 
it's a non-sequitur.  Thread.join() currently returns None, so there's 
no chance for confusion.


From greg.ewing at canterbury.ac.nz  Fri Sep  2 20:51:11 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 03 Sep 2011 12:51:11 +1200
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <mailman.697.1314951544.27778.python-list@python.org>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>	<4E608064.9030005@ixokai.io>
	<mailman.697.1314951544.27778.python-list@python.org>
Message-ID: <9cdc00Fnq3U1@mid.individual.net>

Chris Angelico wrote:

> Although I heard somewhere that that's more gimmick than guarantee,
> and that it IS possible for an app to hook CAD - just that it's a lot
> harder than building a simple window that looks like the login...

And of course it's possible that someone has snuck in
during the night and installed Linux on the machine,
with a program that fakes a Windows login screen,
with Ctrl-Alt-Delete and everything...

-- 
Greg


From nospam at torek.net  Fri Sep  2 21:04:16 2011
From: nospam at torek.net (Chris Torek)
Date: 3 Sep 2011 01:04:16 GMT
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<roy-030914.19162802092011@news.panix.com>
Message-ID: <j3rueg0kkm@news4.newsguy.com>

In article <roy-030914.19162802092011 at news.panix.com>
Roy Smith  <roy at panix.com> wrote:
>Thread.join() currently returns None, so there's 
>no chance for [return value] confusion.

Well, still some actually.  If you use my example code (posted
elsethread), you need to know:

  - that there was a target function (my default return
    value if there is none is None); and
  - that the joined thread really did finish (if you pass
    a timeout value, rather than None, and the join times
    out, the return value is again None).

Of course, if your target function always exists and never returns
None, *then* there's no chance for confusion. :-)
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From jehugaleahsa at gmail.com  Fri Sep  2 21:39:21 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 18:39:21 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
Message-ID: <18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>

On Sep 2, 6:49?pm, Travis Parks <jehugalea... at gmail.com> wrote:
> On Sep 2, 4:09?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Fri, Sep 2, 2011 at 10:59 AM, Travis Parks <jehugalea... at gmail.com> wrote:
> > > Hello:
>
> > > I am working on an algorithms library. It provides LINQ like
> > > functionality to Python iterators. Eventually, I plan on having
> > > feaures that work against sequences and mappings.
>
> > > I have the code up athttp://code.google.com/p/py-compass.
>
> > > This is my first project in Python, so I'd like some feedback. I want
> > > to know if I am following conventions (overall style and quality of
> > > code).
>
> > Sure, here are my comments.
>
> > In the "forever" and "__forever" functions, your use of the term
> > "generator" is confusing. ?"__forever" is a generator function,
> > because it has a yield statement. ?Its argument, called "generator",
> > appears to be a callable, not a generator or even necessarily a
> > generator function. ?Also, note that __forever(lambda: value) is
> > functionally equivalent to the more efficient itertools.repeat(value).
>
> > The staticmethod __next(iterator) accesses the class it is defined in,
> > which suggests that it might be better written as a classmethod
> > __next(cls, iterator).
>
> > Each of the LINQ-style methods is divided into two parts: the public
> > method that contains the docstring and some argument checks, and a
> > private staticmethod that contains the implementation. ?I'm not
> > certain what the purpose of that is. ?If it's to facilitate overriding
> > the implementation in subclasses, then you need to change the names of
> > the private methods to start with only one _ character so that they
> > won't be mangled by the compiler.
>
> > The comments before each method that only contain the name of the
> > immediately following method are redundant.
>
> > aggregate: the default aggregator is unintuitive to me. ?I would make
> > it a required field and add a separate method called sum that calls
> > aggregate with the operator.add aggregator.
> > Also, the implementation doesn't look correct. ?Instead of passing in
> > each item to the aggregator, you're passing in the number of items
> > seen so far? ?The LINQ Aggregate method is basically reduce, so rather
> > than reinvent the wheel I would suggest this:
>
> > # MISSING is a unique object solely defined to represent missing arguments.
> > # Unlike None we can safely assume it will never be passed as actual data.
> > MISSING = object()
>
> > def aggregate(self, aggregator, seed=MISSING):
> > ? ? if seed is self.MISSING:
> > ? ? ? ? return reduce(aggregator, self._iterable)
> > ? ? else:
> > ? ? ? ? return reduce(aggregator, self._iterable, seed)
>
> > Note for compatibility that in Python 3 the reduce function has been
> > demoted from a builtin to a member of the functools module.
>
> > any: the name of this method could cause some confusion with the "any"
> > builtin that does something a bit different.
>
> > compare: the loop would more DRY as a for loop:
>
> > def __compare(first, second, comparison):
> > ? ? for firstval, secondval in itertools.izip_longest(first, second,
> > fillvalue=self.MISSING):
> > ? ? ? ? if firstval is self.MISSING:
> > ? ? ? ? ? ? return -1
> > ? ? ? ? elif secondval is self.MISSING:
> > ? ? ? ? ? ? return 1
> > ? ? ? ? else:
> > ? ? ? ? ? ? result = comparison(firstval, secondval)
> > ? ? ? ? ? ? if result != 0:
> > ? ? ? ? ? ? ? ? return result
> > ? ? return 0
>
> > concatenate: again, no need to reinvent the wheel. ?This should be
> > more efficient:
>
> > def concatenate(self, other):
> > ? ? return extend(itertools.chain(self.__iterable, other))
>
> > equals: could be just "return self.compare(other, comparison) == 0"
>
> > __last: the loop could be a for loop:
>
> > ? ? ? ? # assume we're looking at the last item and try moving to the next
> > ? ? ? ? item = result.Value
> > ? ? ? ? for item in iterator: pass
> > ? ? ? ? return item
>
> > lastOrDefault: there's a lot of repeated logic here. ?This could just be:
>
> > def lastOrDefault(self, default=None):
> > ? ? try:
> > ? ? ? ? return self.last()
> > ? ? except ValueError:
> > ? ? ? ? return default
>
> > map / forEach: .NET has to separate these into separate methods due to
> > static typing. ?It seems a bit silly to have both of them in Python.
> > Also, map would be more efficient as "return itertools.imap(mapper,
> > self.__iterable)"
>
> > max / min: it would be more efficient to use the builtin:
> > def max(self, key):
> > ? ? return max(self.__iterable, key=key)
> > If somebody really needs to pass a comparison function instead of a
> > key function, they can use functools.cmp_to_key.
>
> > randomSamples: a more canonical way to pass the RNG would be to pass
> > an instance of random.Random rather than an arbitrary function. Then
> > to get a random integer you can just call generator.randrange(total).
> > Note that for the default you can just use the random module itself,
> > which provides default implementations of all the Random methods.
> > Also, for loops:
>
> > ? ? def __randomSamples(iterable, sampleCount, generator):
> > ? ? ? ? samples = []
> > ? ? ? ? iterator = iter(iterable)
> > ? ? ? ? # fill up the samples with the items from the beginning of the iterable
> > ? ? ? ? for i, value in zip(xrange(sampleCount), iterator):
> > ? ? ? ? ? ? samples.append(value)
> > ? ? ? ? # replace items if the generated number is less than the total
> > ? ? ? ? total = len(samples)
> > ? ? ? ? for value in iterator:
> > ? ? ? ? ? ? total += 1
> > ? ? ? ? ? ? index = generator.randrange(total)
> > ? ? ? ? ? ? if index < len(samples):
> > ? ? ? ? ? ? ? ? samples[index] = result
> > ? ? ? ? return samples
>
> > __reverse: you could just "return reversed(list(iterable))"
>
> > __rotateLeft:
> > def __rotateLeft(iterable, shift):
> > ? ? iterator = iter(iterable)
> > ? ? front = list(itertools.islice(iterator, shift))
> > ? ? return itertools.chain(iterator, front)
>
> > skipWhile: suggest using itertools.dropwhile
> > take: suggest using itertools.islice
> > takeWhile: suggest using itertools.takewhile
> > __toList: "return list(iterable)"
> > __toSet: "return set(iterable)"
> > __toTuple: "return tuple(iterable)". ?Note that as currently written
> > this actually returns a generator, not a tuple.
> > __where: suggest using itertools.ifilter
> > __zip: suggest using a for loop over itertools.izip(first, second)
>
> > Lookup: is inconsistent. ?The overridden __iter__ method returns an
> > iterator over the values of the groups, but all the inherited methods
> > are going to iterate over the keys. ?Probably you want to pass
> > groups.values() to the superclass __init__ method.
>
> > Cheers,
> > Ian
>
> Awesome tips. I appreciate the time you spent commenting on just about
> every function. I really like your suggestions about using itertools
> more, and for loops. I was feeling like some things were becoming way
>too complicated.
>
> I also noted the bugs you discovered. I will incorporate your
> suggestions.
>
> Thanks again!- Hide quoted text -
>
> - Show quoted text -

You commented that the itertools algorithms will perform faster than
the hand-written ones. Are these algorithms optimized internally?


From bkasterm at gmail.com  Fri Sep  2 22:15:11 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Fri, 02 Sep 2011 20:15:11 -0600
Subject: List comprehension timing difference.
References: <87zkinkcht.fsf@gmail.com>
	<mailman.676.1314925972.27778.python-list@python.org>
	<87sjofjbh1.fsf@gmail.com>
	<07906043-d732-43ca-8313-bee4746eca75@fi7g2000vbb.googlegroups.com>
Message-ID: <87bov29xsg.fsf@gmail.com>

ting at thsu.org writes:

> On Sep 2, 9:54?am, Bart Kastermans <bkast... at gmail.com> wrote:
>> if d(a,b) == 1 and a < b:
>
> It will probably be faster if you reverse the evaluation order of that
> expression.
>
> if a<b and d(a,b)==1:
>
> That way the d() function is called less than half the time. Of course
> this assumes that a<b is a faster evaluation than d(a,b), but I think
> that's true for your example.
> --
> // T.Hsu

Indeed makes quite a difference, goes from 275 seconds down to
153 seconds.


From clp2 at rebertia.com  Fri Sep  2 22:23:11 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 2 Sep 2011 19:23:11 -0700
Subject: Algorithms Library - Asking for Pointers
In-Reply-To: <18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
	<18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
Message-ID: <CAMZYqRT9UOqHDViLCXB0L0MVYjxVMN5wdaAOnQbin-VEPggP4w@mail.gmail.com>

On Fri, Sep 2, 2011 at 6:39 PM, Travis Parks <jehugaleahsa at gmail.com> wrote:
<snip>
> You commented that the itertools algorithms will perform faster than
> the hand-written ones. Are these algorithms optimized internally?

For one thing, they are written in C.

Cheers,
Chris


From lanyjie at yahoo.com  Sat Sep  3 00:18:21 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Fri, 2 Sep 2011 21:18:21 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>

Have you considered line continuation by indentation? It seems to meet the design principle. I think it is the most natural way to allow free line breaking in Python.

(Sorry, the yahoo web email interface is so weird that I don't know how to format comments between the quoted message below.)




>________________________________
>From: Stephen J. Turnbull <stephen at xemacs.org>
>To: Gabriel AHTUNE <gahtune at gmail.com>
>Cc: Matt Joiner <anacrolix at gmail.com>; "python-list at python.org" <python-list at python.org>; python-ideas <python-ideas at python.org>; Yingjie Lan <lanyjie at yahoo.com>
>Sent: Friday, September 2, 2011 3:28 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>Gabriel AHTUNE writes:
>> So can be done with this syntax:
>> 
>> > x = firstpart * secondpart? +? #line breaks here
>> > anotherpart + #continue
>> > stillanother #continue on.
>> 
>> after a "+" operator the line is clearly not finished yet.
>
>Sure, but IIRC one design principle of Python is that the keyword that
>denotes the syntax should be the first thing on the line, making it
>easy to scan down the left side of the code to see the syntactic
>structure.? The required indentation of the controlled suite also
>helps emphasize that keyword.
>
>Analogously, if operators are going to denote continuation, they
>should come first on the line.
>
>
>
>I just don't think this idea is going anywhere.? Explicit continuation
>with backslash or implicit continuation of parenthesized expressions
>is just not that heavy a price to pay.? Perhaps historically some of
>these ideas could have been implemented, but now they're just going to
>confuse a host of editors and code analysis tools.
>
>
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From nospam at torek.net  Sat Sep  3 00:35:05 2011
From: nospam at torek.net (Chris Torek)
Date: 3 Sep 2011 04:35:05 GMT
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
	<18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
Message-ID: <j3sapp01jeh@news1.newsguy.com>

In article <18fe4afd-569b-4580-a629-50f6c74829e8 at c29g2000yqd.googlegroups.com>
Travis Parks  <jehugaleahsa at gmail.com> wrote:
>[Someone] commented that the itertools algorithms will perform
>faster than the hand-written ones. Are these algorithms optimized
>internally?

They are written in C, so avoid a lot of CPython interpreter
overhead.  Mileage in Jython, etc., may vary...
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From stephen at xemacs.org  Sat Sep  3 00:38:15 2011
From: stephen at xemacs.org (Stephen J. Turnbull)
Date: Sat, 03 Sep 2011 13:38:15 +0900
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
Message-ID: <87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>

Guido van Rossum writes:
 > On Fri, Sep 2, 2011 at 12:28 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:

 > > Sure, but IIRC one design principle of Python is that the keyword that
 > > denotes the syntax should be the first thing on the line,
[...]
 > That's true for *statements* (except assignments and calls).
 > 
 > > Analogously, if operators are going to denote continuation, they
 > > should come first on the line.

 > That doesn't follow.

Agreed, it's not a logical implication.  The analogy is only an
analogy, but my eyes do work that way.

My conclusion is that we shouldn't try to encourage either style,
because people "see" continuation differently.  Legislating a style
isn't going to change that, I think.





From ian.g.kelly at gmail.com  Sat Sep  3 00:38:22 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 2 Sep 2011 22:38:22 -0600
Subject: sqlite3 with context manager
In-Reply-To: <j3r859$rnt$1@foggy.unx.sas.com>
References: <j3r859$rnt$1@foggy.unx.sas.com>
Message-ID: <CALwzidk8Yb_iqhgFoc+M4v_AeENY8jszyjWzpSQ96H4V6hzewg@mail.gmail.com>

On Fri, Sep 2, 2011 at 12:43 PM, Tim Arnold <Tim.Arnold at sas.com> wrote:
> Hi,
> I'm using the 'with' context manager for a sqlite3 connection:
>
> with sqlite3.connect(my.database,timeout=10) as conn:
> ? ? ? ? ? ?conn.execute('update config_build set datetime=?,result=?
> where id=?',
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(datetime.datetime.now(), success,
> self.b['id']))
>
> my question is what happens if the update fails? Shouldn't it throw an
> exception?

That depends on why it fails.  If you pass in an id that doesn't exist
in the database, it "successfully" updates 0 rows.  I would guess
that's what happened here.  You should check cursor.rowcount after
running the update query to make sure it actually did something.

Cheers,
Ian


From d_vineet at yahoo.com  Sat Sep  3 01:36:56 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Fri, 2 Sep 2011 22:36:56 -0700 (PDT)
Subject: json in python 2.5
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
Message-ID: <1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>

> e.g., I have this list:
> L = ['spam', 'ham', 'eggs', 12, (13.63)]
> What is the correct way to convert L to javascript array format?
> 1) jsonify the list and pass it to javascript
> (whether json format & javascript array are similar?)

JSON is in fact a subset of JavaScript, and modern browsers now
include a specific API for parsing and generating it
(https://developer.mozilla.org/En/Using_native_JSON ).
=============
@Chris, thanks for the pointer on parsing json.
=============
Python likewise has a JSON module in the std lib:
http://docs.python.org/library/json.html
========
I tried with json in std lib.
But it is included in python 2.6 onwards.
For my current proj, I need to use python 2.5.
Hence can't use json from the std lib.
Any idea on converting list to json in python 2.5?
=========

Thanks,
Vineet
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From clp2 at rebertia.com  Sat Sep  3 01:50:36 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 2 Sep 2011 22:50:36 -0700
Subject: json in python 2.5
In-Reply-To: <1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
	<1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
Message-ID: <CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>

On Fri, Sep 2, 2011 at 10:36 PM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
>> e.g., I have this list:
>> L = ['spam', 'ham', 'eggs', 12, (13.63)]
>> What is the correct way to convert L to javascript array format?
<snip>
> Python likewise has a JSON module in the std lib:
> http://docs.python.org/library/json.html
> ========
> I tried with json in std lib.
> But it is included in python 2.6 onwards.
> For my current proj, I need to use python 2.5.
> Hence can't use json from the std lib.
> Any idea on converting list to json in python 2.5?

http://pypi.python.org/pypi/simplejson/

Cheers,
Chris


From stephen at xemacs.org  Sat Sep  3 02:10:26 2011
From: stephen at xemacs.org (Stephen J. Turnbull)
Date: Sat, 03 Sep 2011 15:10:26 +0900
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
Message-ID: <87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>

Yingjie Lan writes:

 > Have you considered line continuation by indentation? It seems to
 > meet the design principle. I think it is the most natural way to
 > allow free line breaking in Python.

Briefly, yes, and I think it would need a lot of tuning and probably
complex rules.  Unlike statements, where everybody (except the judges
of the Obfuscated C Contest) agrees on a simple rule: "In a control
structure, the controlled suite should be uniformly indented one
level", line breaking and indentation of long expressions is an art,
and people have different opinions on "readability" and "beauty."
Achieving a compromise that is workable even for a few major styles is
likely to be annoying and bug-prone.

Pretty much every program I write seems to have a continued list of
data or a multi-line dictionary display as data.  It's not unusual for
me to comment the formal arguments in a function definition, or the
parent classes of a class definition.  The exception for parenthesized
objects is something I depend on for what I consider good style.  Of
course I could use explicit continuation, but in a long table that's
ugly and error-prone.

Long expressions that need to be broken across lines, on the other
hand, often indication that I haven't thought carefully enough about
that component of the program, and an extra pair of parentheses or a
terminal backslash just isn't that "heavy" or ugly in the context of
such long expressions.  For me, they're also pretty rare; many
programs I write have no explicit continuations in them at all.

YMMV, of course, but I find the compromise that Python arrived at to
be very useful, and I must suppose that it was substantially easier to
implement than "fully free" line breaking (whatever that means to you).


From pavlovevidence at gmail.com  Sat Sep  3 03:03:22 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 3 Sep 2011 00:03:22 -0700 (PDT)
Subject: sqlite3 with context manager
In-Reply-To: <j3r859$rnt$1@foggy.unx.sas.com>
References: <j3r859$rnt$1@foggy.unx.sas.com>
Message-ID: <7dbe35af-9cc7-42a8-9288-465e542b9ea6@glegroupsg2000goo.googlegroups.com>

On Friday, September 2, 2011 11:43:53 AM UTC-7, Tim Arnold wrote:
> Hi,
> I'm using the 'with' context manager for a sqlite3 connection:
> 
> with sqlite3.connect(my.database,timeout=10) as conn:
>              conn.execute('update config_build set datetime=?,result=?
> where id=?',
>                                (datetime.datetime.now(), success,
> self.b['id']))
> 
> my question is what happens if the update fails? Shouldn't it throw an
> exception?

If you look at the sqlite3 syntax documentation, you'll see it has a SQL extension that allows you to specify error semantics.  It looks something like this:

UPDATE OR IGNORE
UPDATE OR FAIL
UPDATE OR ROLLBACK

I'm not sure exactly how this interacts with pysqlite3, but using one of these might help it throw exceptions when you want it to.


Carl Banks


From nobody at nowhere.com  Sat Sep  3 03:49:49 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 03 Sep 2011 08:49:49 +0100
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<4E608064.9030005@ixokai.io>
	<mailman.697.1314951544.27778.python-list@python.org>
Message-ID: <pan.2011.09.03.07.49.49.294000@nowhere.com>

On Fri, 02 Sep 2011 17:55:41 +1000, Chris Angelico wrote:

>> That's why you have to hit CAD to get to the login form in some versions
>> of Windows. The whole point of that secure sequence is that the OS and
>> only the OS responds.
> 
> Although I heard somewhere that that's more gimmick than guarantee,
> and that it IS possible for an app to hook CAD

It's possible to configure how CAD is handled, but this requires
Administrator privilege, so it's not exploitable (i.e. it doesn't gain you
anything you can't obtain by other means).



From lanyjie at yahoo.com  Sat Sep  3 03:51:11 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 00:51:11 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>

I agree that long lines of code are not very common in many projects, though it might be the case with some heavily involved in math. For some reason, when the feature of free line breaking came about in computer languages, it is welcomed and generally well accepted. Python uses indentation for blocks, and by the same mechanism, line breaking can be?accommodated without requiring parenthesis or ending backslashes.

For the tuning, yes, people would disagree on how to split expressions/code. The continue-by-indentation would allow people to break a line in whatever way that pleases their aesthetic taste, as long as there is an indentation. Most people seems to like an indentation on the continuing lines, probably for a visual indication of a continuation line. Some general guidelines may be provided, but there is no need for other hard rules on breaking lines, except that an identifier should never be split apart.

For the implementation, I don't have much clue. At least on the parser, it needs to look beyond the linefeed to determine if a line is completed. If the indentation is defined as a single symbol, then it would only require a one-step look-ahead, and that should not be hard.

Again, my?apology?for top posting.



>________________________________
>From: Stephen J. Turnbull <stephen at xemacs.org>
>To: Yingjie Lan <lanyjie at yahoo.com>
>Cc: Gabriel AHTUNE <gahtune at gmail.com>; Matt Joiner <anacrolix at gmail.com>; "python-list at python.org" <python-list at python.org>; python-ideas <python-ideas at python.org>
>Sent: Saturday, September 3, 2011 2:10 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>Yingjie Lan writes:
>
>> Have you considered line continuation by indentation? It seems to
>> meet the design principle. I think it is the most natural way to
>> allow free line breaking in Python.
>
>Briefly, yes, and I think it would need a lot of tuning and probably
>complex rules.? Unlike statements, where everybody (except the judges
>of the Obfuscated C Contest) agrees on a simple rule: "In a control
>structure, the controlled suite should be uniformly indented one
>level", line breaking and indentation of long expressions is an art,
>and people have different opinions on "readability" and "beauty."
>Achieving a compromise that is workable even for a few major styles is
>likely to be annoying and bug-prone.
>
>Pretty much every program I write seems to have a continued list of
>data or a multi-line dictionary display as data.? It's not unusual for
>me to comment the formal arguments in a function definition, or the
>parent classes of a class definition.? The exception for parenthesized
>objects is something I depend on for what I consider good style.? Of
>course I could use explicit continuation, but in a long table that's
>ugly and error-prone.
>
>Long expressions that need to be broken across lines, on the other
>hand, often indication that I haven't thought carefully enough about
>that component of the program, and an extra pair of parentheses or a
>terminal backslash just isn't that "heavy" or ugly in the context of
>such long expressions.? For me, they're also pretty rare; many
>programs I write have no explicit continuations in them at all.
>
>YMMV, of course, but I find the compromise that Python arrived at to
>be very useful, and I must suppose that it was substantially easier to
>implement than "fully free" line breaking (whatever that means to you).
>
>
>
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From kissgoodbye5204 at yahoo.com.cn  Sat Sep  3 04:28:12 2011
From: kissgoodbye5204 at yahoo.com.cn (www.brandtrade10.com)
Date: Sat, 3 Sep 2011 01:28:12 -0700 (PDT)
Subject: Nike Air Max LeBron VIII
Message-ID: <89bd2be6-2cea-4c1a-8491-769fca930562@w22g2000prj.googlegroups.com>

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From alain at dpt-info.u-strasbg.fr  Sat Sep  3 04:33:10 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sat, 03 Sep 2011 10:33:10 +0200
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
Message-ID: <878vq62fg9.fsf@dpt-info.u-strasbg.fr>

Adam Skutt <askutt at gmail.com> writes:

> On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
> wrote:
>> Sorry, you're wrong, at least for POSIX threads:
>>
>> void pthread_exit(void *value_ptr);
>> int pthread_join(pthread_t thread, void **value_ptr);
>>
>> pthread_exit can pass anything, and that value will be retrieved with
>> pthread_join.
>
> No, it can only pass a void*, which isn't much better than passing an
> int.

We'll have to disagree. A void* simply can point to anything you want.
Since thread stacks disappear at end of thread, only dynamically
allocated memory can be used to store the result. That's why you get a
pointer. There is no restriction on that pointer provided it doesn't
point to memory that has been deallocated.

> Passing a void* is not equivalent to passing anything, not even in C.
> Moreover, specific values are still reserved, like PTHREAD_CANCELLED.

Thread cancellation is program logic (pthread_cancel), it doesn't mean
you thread crashed, it means your program decided to cancel the thread.
If you still care about the return value after having called
pthread_cancel(), 

> Yes, it was strictly inappropriate for me to say both return solely
> integers, but my error doesn't meaningful alter my description of the
> situation. The interface provided by the underlying APIs is not
> especially usable for arbitrary data transfer.

Again, I may misunderstand your wording, but there is no "data transfer"
at all, since memory is shared between threads.

> Doubly so when we're discussing something like Python's threading
> module.

The OP was clearly discussing the case where a thread has a result, and
how to get it back. POSIX threads let you do that. There are of course
tons of other ways to do the same thing. Win32 will force you to use
some other way.

>> I'm not sure what you are talking about here. Maybe you confuse threads
>> with processes?
>
> Windows threads have exit codes, just like processes.  At least one
> code is reserved and cannot be used by the programmer.

Is that STILL_ACTIVE that we are talking about? That's an artefact of
the design of GetExitCodeThread, which will return either the thread
exit code or its own error code. The python lib could easily hide this,
and use run()'s return value to store the (python) result somewhere.

-- Alain.


From d_vineet at yahoo.com  Sat Sep  3 04:58:44 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Sat, 3 Sep 2011 01:58:44 -0700 (PDT)
Subject: json: python 2.5: error in browser
In-Reply-To: <CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
	<1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
	<CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>
Message-ID: <1315040324.53959.YahooMailNeo@web160509.mail.bf1.yahoo.com>

> Any idea on converting list to json in python 2.5?
http://pypi.python.org/pypi/simplejson/
Cheers,
Chris
=============
Now I built json from simplejson.
While trying to render the same in browser, nothing is displayed.
Opera Dragonfly shows this error:--
?
Uncaught exception: SyntaxError: JSON.parse: Unable to parse value: A,B,C
Error thrown at line 3, column 0 in http://127.0.0.1:8000/mywheels/test/cat:
??? var ctg = JSON.parse(["A", "B", "C"]);
~~~~~~~~~~~~~~~~
I validated this json --? ["A", "B", "C"]?? in jsonlint.com
It is valid json.
?
Why the?method "JSON.parse" is unable to parse JSON?
?
--Vineet
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From alain at dpt-info.u-strasbg.fr  Sat Sep  3 05:00:22 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sat, 03 Sep 2011 11:00:22 +0200
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
	<878vq62fg9.fsf@dpt-info.u-strasbg.fr>
Message-ID: <874o0u2e6x.fsf@dpt-info.u-strasbg.fr>

Alain Ketterlin <alain at dpt-info.u-strasbg.fr> writes:

>> Passing a void* is not equivalent to passing anything, not even in C.
>> Moreover, specific values are still reserved, like PTHREAD_CANCELLED.
>
> Thread cancellation is program logic (pthread_cancel), it doesn't mean
> you thread crashed, it means your program decided to cancel the thread.
> If you still care about the return value after having called
> pthread_cancel(), 

Sotry, forgot to end this sentence... What I mean is:

If you still care about the return value after having called
pthread_cancel(), your program logic is unnecessarily complex, and
you should find some other way to handle this case.

-- Alain.


From clp2 at rebertia.com  Sat Sep  3 05:21:44 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 3 Sep 2011 02:21:44 -0700
Subject: json: python 2.5: error in browser
In-Reply-To: <1315040324.53959.YahooMailNeo@web160509.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
	<1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
	<CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>
	<1315040324.53959.YahooMailNeo@web160509.mail.bf1.yahoo.com>
Message-ID: <CAMZYqRQSyoa32+LDYdaifNCgRYYFq4iaLVZS-WOxQEh0uBPogw@mail.gmail.com>

On Sat, Sep 3, 2011 at 1:58 AM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
> Opera Dragonfly shows this error:--
>
> Uncaught exception: SyntaxError: JSON.parse: Unable to parse value: A,B,C
> Error thrown at line 3, column 0 in http://127.0.0.1:8000/mywheels/test/cat:
> ??? var ctg = JSON.parse(["A", "B", "C"]);
> ~~~~~~~~~~~~~~~~
> I validated this json --? ["A", "B", "C"]?? in jsonlint.com
> It is valid json.
>
> Why the?method "JSON.parse" is unable to parse JSON?

It takes a *string* containing JSON. You want:
var ctg = JSON.parse('["A", "B", "C"]');// note outer quotes!

Think about it: If you already had ["A", "B", "C"] in the first place,
then you could just do:
var ctg = ["A", "B", "C"];
And JSON would never enter into the discussion.

Your issue is akin to confusing the following two outputs:
Python 2.6.6 (r266:84292, Jan 12 2011, 13:35:00)
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 'foo' # expression resulting in the string
'foo'
>>> print 'foo' # contents of the string
foo

Regards,
Chris


From lanyjie at yahoo.com  Sat Sep  3 06:33:48 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 03:33:48 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>

Ambiguity: yes, when the last line of a suite is a continued line, it would require double dedentations to end the line and the suite. I noticed a similar case in current Python language as well:

==================================
#BEGIN CODE 1
if condition:
for i in range(5):
triangulate(i)
else: #double dedentations
for body in space:
triangulate(body)
#double dedentations again
log('triangulation done')
#END CODE 1
==================================



If lines can be continued by indentation, similar situation would rise:

==================================
#BEGIN CODE 2
if condition:
result = [sin(i) for i in range(5)]
+ [cos(i) for i in range(5)]
else:

result = [cos(i) for i in range(5)]
+ [sin(i) for i in range(5)]

log('triangulation done')
#END CODE 2
==================================


Generating text example: right, this is a case that can't be handled by standard indentation, unless we only consider full dedentation (dedentation to the exact level of the initial indentation) as the signal of ending the line. Whether to?accommodate?for such a case might be an issue of debate, but at least we can have such 'freedom' :)




>________________________________
>From: Stephen J. Turnbull <stephen at xemacs.org>
>To: Yingjie Lan <lanyjie at yahoo.com>
>Cc: Gabriel AHTUNE <gahtune at gmail.com>; Matt Joiner <anacrolix at gmail.com>; python-ideas <python-ideas at python.org>
>Sent: Saturday, September 3, 2011 5:29 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>Yingjie Lan writes:
>
>> Python uses indentation for blocks, and by the same mechanism, line
>> breaking can be?accommodated without requiring parenthesis or
>> ending backslashes.
>
>Possibly, but now you have a problem that a dedent has ambiguous
>meaning.? It might mean that you're ending a suite, or it might mean
>you're ending a continued expression.? This probably can be
>disambiguated, but I don't know how easy that will be to do perfectly,
>including in reporting ill-formed programs.
>
>> Most people seems to like an indentation on the continuing lines,
>
>Most of the time, yes, but sometimes not.? For example, in generating
>text, it's often useful to dedent substantially so you can have a
>nearly normal length line in the literal strings being concatenated.
>Or you might have a pattern like this:
>
>? ? x = long_named_variable_a
>? ? ? ? ? ? - long_named_variable_a_base
>? ? ? ? + long_named_variable_b
>? ? ? ? ? ? - long_named_variable_b_base
>
>which your parser would raise an error on, I presume.? That's not
>freedom!<wink />
>
>
>
>
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From lanyjie at yahoo.com  Sat Sep  3 06:50:30 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 03:50:30 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
Message-ID: <1315047030.94472.YahooMailNeo@web121507.mail.ne1.yahoo.com>

Oops, the generating text part of my reply is referring to your last code example. For literal texts, it is is not governed by this proposal, nor are expressions within brackets and backslash continued lines. In a word, this proposal is fully backward compatible.



>________________________________
>From: Yingjie Lan <lanyjie at yahoo.com>
>To: Stephen J. Turnbull <stephen at xemacs.org>
>Cc: python list <python-list at python.org>; Gabriel AHTUNE <gahtune at gmail.com>; python-ideas <python-ideas at python.org>; Matt Joiner <anacrolix at gmail.com>
>Sent: Saturday, September 3, 2011 6:33 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>
>Ambiguity: yes, when the last line of a suite is a continued line, it would require double dedentations to end the line and the suite. I noticed a similar case in current Python language as well:
>
>
>==================================
>#BEGIN CODE 1
>if condition:
>for i in range(5):
>triangulate(i)
>else: #double dedentations
>for body in space:
>triangulate(body)
>#double dedentations again
>log('triangulation done')
>#END CODE 1
>==================================
>
>
>
>If lines can be continued by indentation, similar situation would rise:
>
>
>==================================
>#BEGIN CODE 2
>if condition:
>result = [sin(i) for i in range(5)]
>+ [cos(i) for i in range(5)]
>else:
>
>result = [cos(i) for i in range(5)]
>+ [sin(i) for i in range(5)]
>
>
>log('triangulation done')
>#END CODE 2
>==================================
>
>
>
>Generating text example: right, this is a case that can't be handled by standard indentation, unless we only consider full dedentation (dedentation to the exact level of the initial indentation) as the signal of ending the line. Whether to?accommodate?for such a case might be an issue of debate, but at least we can have such 'freedom' :)
>
>
>
>
>
>>________________________________
>>From: Stephen J. Turnbull <stephen at xemacs.org>
>>To: Yingjie Lan <lanyjie at yahoo.com>
>>Cc: Gabriel AHTUNE <gahtune at gmail.com>; Matt Joiner <anacrolix at gmail.com>; python-ideas <python-ideas at python.org>
>>Sent: Saturday, September 3, 2011 5:29 PM
>>Subject: Re: [Python-ideas] allow line break at operators
>>
>>Yingjie Lan writes:
>>
>>> Python uses indentation for blocks, and by the same mechanism, line
>>> breaking can be?accommodated without requiring parenthesis or
>>> ending backslashes.
>>
>>Possibly, but now you have a problem that a dedent has ambiguous
>>meaning.? It might mean that you're ending a suite, or it might mean
>>you're ending a continued expression.? This probably can be
>>disambiguated, but I don't know how easy that will be to do
 perfectly,
>>including in reporting ill-formed programs.
>>
>>> Most people seems to like an indentation on the continuing lines,
>>
>>Most of the time, yes, but sometimes not.? For example, in generating
>>text, it's often useful to dedent substantially so you can have a
>>nearly normal length line in the literal strings being concatenated.
>>Or you might have a pattern like this:
>>
>>? ? x = long_named_variable_a
>>? ? ? ? ? ? - long_named_variable_a_base
>>? ? ? ? + long_named_variable_b
>>? ? ? ? ? ? - long_named_variable_b_base
>>
>>which your parser would raise an error on, I presume.? That's not
>>freedom!<wink />
>>
>>
>>
>>
>-- 
>http://mail.python.org/mailman/listinfo/python-list
>
>
>
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From pavlovevidence at gmail.com  Sat Sep  3 08:04:42 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 3 Sep 2011 05:04:42 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
In-Reply-To: <5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
Message-ID: <6a30f0e6-cd0b-4ae2-9a0a-067411bc184f@glegroupsg2000goo.googlegroups.com>

On Friday, September 2, 2011 11:01:17 AM UTC-7, Adam Skutt wrote:
> On Sep 2, 10:53?am, Roy Smith <r.... at panix.com> wrote:
> > I have a function I want to run in a thread and return a value. ?It
> > seems like the most obvious way to do this is to have my target
> > function return the value, the Thread object stash that someplace, and
> > return it as the return value for join().
> > > Yes, I know there's other ways for a thread to return values (pass the
> > target a queue, for example), but making the return value of the
> > target function available would have been the most convenient. ?I'm
> > curious why threading wasn't implemented this way.
> 
> I assume it is because the underlying operating system APIs do not
> support it.

Nope.  This could easily be implemented by storing the return value in the Thread object.

It's not done that way probably because no one thought of doing it.


Carl Bannks


From pavlovevidence at gmail.com  Sat Sep  3 08:27:51 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 3 Sep 2011 05:27:51 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
In-Reply-To: <bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
Message-ID: <7ea98c63-e045-45f2-9602-0c3b4495d141@glegroupsg2000goo.googlegroups.com>

On Friday, September 2, 2011 11:53:43 AM UTC-7, Adam Skutt wrote:
> On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
> wrote:
> > Sorry, you're wrong, at least for POSIX threads:
> >
> > void pthread_exit(void *value_ptr);
> > int pthread_join(pthread_t thread, void **value_ptr);
> >
> > pthread_exit can pass anything, and that value will be retrieved with
> > pthread_join.
> 
> No, it can only pass a void*, which isn't much better than passing an
> int.  Passing a void* is not equivalent to passing anything, not even
> in C.  Moreover, specific values are still reserved, like
> PTHREAD_CANCELLED. Yes, it was strictly inappropriate for me to say
> both return solely integers, but my error doesn't meaningful alter my
> description of the situation.  The interface provided by the
> underlying APIs is not especially usable for arbitrary data transfer.

I'm sorry, but your claim is flat out wrong.  It's very common in C programming to use a void* to give a programmer ability to pass arbitrary data through some third-party code.

The Python API itself uses void* in this way in several different places.  For instance, ake a look at the Capsule API (http://docs.python.org/c-api/capsule.html).  You'll notice it uses a void* to let a user pass in opaque data.  Another case is when declaring properties in C: it's common to define a single get or set function, and only vary some piece of data for the different properties.  The API provides a void* so that the extension writer can pass arbitrary data to the get and set functions.


Carl Banks


From benjamin at schollnick.net  Sat Sep  3 10:11:17 2011
From: benjamin at schollnick.net (Benjamin Schollnick)
Date: Sat, 3 Sep 2011 10:11:17 -0400
Subject: Need advice on Web / Database framework...
Message-ID: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>

Folks,

I need some advice on a python web & database framework to use...?

I have handcrafted a sqllite3 python script, that is a basic web application, interfacing with a sqlite3 database...

But I am concerned at the thought of handcrafting a administration interface, and so forth.

Are there any recommendations on a python toolkit / framework that could help deal with the realities of this?
The main issue is hand crafting all the forms and html web pages...  

I have done a little cheetah templating...  So that might be a partial solution, but I'm concerned with someone trying to craft a malicious payload in the fields, and so forth...  

I have thought about an out of the box solution, for example, using a wordpress install for the front-end, but I haven't been able to think of a good way to bridge this gap.

Would Zope be a good solution possibly?  Any suggestions would be appreciated...

		- Ben

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From mukeshtiwari.iiitm at gmail.com  Sat Sep  3 10:40:03 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Sat, 3 Sep 2011 07:40:03 -0700 (PDT)
Subject: Reading pen drive data
Message-ID: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>

Hello all
I am trying to write a python script which can mount a pen drive and
read the data from pen drive. I am using pyudev [
http://packages.python.org/pyudev/api/index.html ] and wrote a small
python code

import pyudev, sys
if __name__ =="__main__":
        context = pyudev.Context()
        devices = context.list_devices(subsystem        ="usb")
        for device in devices :
                print device

which prints

Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')

My problem is,  how to know  out of these usb which one to read . The
other solution I got is whenever I insert the pen drive , my system
mounts  it in /media  directory so I can read the /media directory  to
check if its empty or not but this does not seems promising to me
because it may be possible that my system is not able to mount the pen
drive so I have to manually do it .  Kindly some one please tell me
how to solve this problem.


From noreply at domain.invalid  Sat Sep  3 12:15:12 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 12:15:12 -0400
Subject: Functions vs OOP
Message-ID: <j3tjov$c30$1@dont-email.me>

During some recent research, and re-familiarization with Python, I came 
across documentation that suggests that programming using functions, and 
programming using objects were somehow opposing techniques.

It seems to me that they are complimentary.  It makes sense to create 
objects and have some functions that take those objects as arguments. 
Are they suggesting that any function that takes an object as an 
argument should always be a method of that object?  Conversely I can see 
creating functions that take raw input (e.g. strings) and return it in a 
format compatible with an object's constructor, rather than have objects 
accept any conceivable format for its constructor.

Am I missing something, or am I taking things too literally?


From mukeshtiwari.iiitm at gmail.com  Sat Sep  3 12:21:57 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Sat, 3 Sep 2011 09:21:57 -0700 (PDT)
Subject: Reading pen drive data
References: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>
Message-ID: <4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>

On Sep 3, 7:40?pm, mukesh tiwari <mukeshtiwari.ii... at gmail.com> wrote:
> Hello all
> I am trying to write a python script which can mount a pen drive and
> read the data from pen drive. I am using pyudev [http://packages.python.org/pyudev/api/index.html] and wrote a small
> python code
>
> import pyudev, sys
> if __name__ =="__main__":
> ? ? ? ? context = pyudev.Context()
> ? ? ? ? devices = context.list_devices(subsystem ? ? ? ?="usb")
> ? ? ? ? for device in devices :
> ? ? ? ? ? ? ? ? print device
>
> which prints
>
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')
>
> My problem is, ?how to know ?out of these usb which one to read . The
> other solution I got is whenever I insert the pen drive , my system
> mounts ?it in /media ?directory so I can read the /media directory ?to
> check if its empty or not but this does not seems promising to me
> because it may be possible that my system is not able to mount the pen
> drive so I have to manually do it . ?Kindly some one please tell me
> how to solve this problem.

I got this link and its working fine [ http://packages.python.org/pyudev/api/monitor.html
]
>>> context = pyudev.Context()
>>> monitor = pyudev.Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> for action, device in monitor:
...     print('{0}: {1}'.format(action, device))

but when I am trying to execute code [ http://packages.python.org/pyudev/api/toolkit.html
]

import pyudev, sys

context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem='usb')
observer = QUDevMonitorObserver(monitor)
def device_connected(device):
     print('{0!r} added'.format(device))
observer.deviceAdded.connect(device_connected)
monitor.start()

I am getting
Traceback (most recent call last):
  File "Mount.py", line 7, in <module>
    observer = QUDevMonitorObserver(monitor)
NameError: name 'QUDevMonitorObserver' is not defined

Could any one please tell me how to avoid this error .
Thank you


From steve+comp.lang.python at pearwood.info  Sat Sep  3 12:25:43 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 04 Sep 2011 02:25:43 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>

William Gill wrote:

> During some recent research, and re-familiarization with Python, I came
> across documentation that suggests that programming using functions, and
> programming using objects were somehow opposing techniques.
> 
> It seems to me that they are complimentary.  It makes sense to create
> objects and have some functions that take those objects as arguments.

Python is a mixed paradigm language, with object, functional and imperative
paradigms.


> Are they suggesting that any function that takes an object as an
> argument should always be a method of that object?

Yes.

http://steve-yegge.blogspot.com/2006/03/execution-in-kingdom-of-nouns.html

[...]
> Am I missing something, or am I taking things too literally?

No, it is the OO purists who are missing something.



-- 
Steven



From python at mrabarnett.plus.com  Sat Sep  3 12:29:11 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 03 Sep 2011 17:29:11 +0100
Subject: Functions vs OOP
In-Reply-To: <j3tjov$c30$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <4E6255D7.2070005@mrabarnett.plus.com>

On 03/09/2011 17:15, William Gill wrote:
> During some recent research, and re-familiarization with Python, I
> came across documentation that suggests that programming using
> functions, and programming using objects were somehow opposing
> techniques.
>
> It seems to me that they are complimentary.

I think you mean "complementary". :-)

> It makes sense to create objects and have some functions that take
> those objects as arguments. Are they suggesting that any function
> that takes an object as an argument should always be a method of that
> object? Conversely I can see creating functions that take raw input
> (e.g. strings) and return it in a format compatible with an object's
> constructor, rather than have objects accept any conceivable format
> for its constructor.
>
> Am I missing something, or am I taking things too literally?

I think that it's all about "state".

In functional programming, there's no state; a function's result
depends solely on its arguments, so it will always return the same
result for the same given arguments.

In OOP, on the other hand, an object often has a state; a method may
return a different result each time it's called, even for the same
given arguments.


From me+list/python at ixokai.io  Sat Sep  3 12:50:25 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Sat, 03 Sep 2011 09:50:25 -0700
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
Message-ID: <4E625AD1.6060103@ixokai.io>

On 9/3/11 3:33 AM, Yingjie Lan wrote:
> but at least we can have such 'freedom' :)

Freedom is not and never has been, IMHO, a virtue or goal or even desire
in Python. Where it occurs, it is at best a happy coincidence, and even
if that happy coincidence happens often, it is not a design feature, IMHO.

Simplicity and readability are virtues in Python. Freedom is even
declared a vice to be avoided by the Zen, that holy document which
defines all things Pythonic in clear and unambiguously absolute terms*.

Looking over this whole thread at the various examples -- they add
complication (a vice!). Complication to the parser, complication to the
language itself and worse, understanding of code (as your head has to
parse things too), all for what?

So you don't have to use parens, which quite explicitly (another
virtue!) do the job, to wrap around a long expression? Escaping newlines
is arguably a bit on the ugly side (a vice!), so maybe the proposal has
a little weight there, but since you can just avoid that by using
parens, that's pretty much nullified. (Since it is also a virtue to
offer only the Dutch way of doing things -- at least without hiding the
alternatives in modules with a little bit of shame -- and this is
clearly a case of the Dutch liking limited use of grouping parens).

There just isn't even vaguely enough justification based on
Python-virtues (readability, simplicity, explicitness, things like that)
to even kind of make it worth the complication.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

* Obvious exaggeration :P

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From roy at panix.com  Sat Sep  3 12:51:03 2011
From: roy at panix.com (Roy Smith)
Date: Sat, 03 Sep 2011 12:51:03 -0400
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
	<j3rdg00fmp@news6.newsguy.com>
Message-ID: <roy-A4ECCE.12510303092011@news.panix.com>

In article <j3rdg00fmp at news6.newsguy.com>,
 Chris Torek <nospam at torek.net> wrote:

> For that matter, you can use the following to get what the OP asked
> for.  (Change all the instance variables to __-prefixed versions
> if you want them to be Mostly Private.)
> 
> import threading
> 
> class ValThread(threading.Thread):
>     "like threading.Thread, but the target function's return val is captured"
>     def __init__(self, group=None, target=None, name=None,
>             args=(), kwargs=None, verbose=None):
>         super(ValThread, self).__init__(group, None, name, None, None, 
>         verbose)
>         self.value = None
>         self.target = target
>         self.args = args
>         self.kwargs = {} if kwargs is None else kwargs
> 
>     def run(self):
>         "run the thread"
>         if self.target:
>             self.value = self.target(*self.args, **self.kwargs)
> 
>     def join(self, timeout = None):
>         "join, then return value set by target function"
>         super(ValThread, self).join(timeout)
>         return self.value

Yeah, that's pretty much what I had in mind.  I'm inclined to write up a 
PEP proposing that this become the standard behavior of 
threading.Thread.  It seems useful, and I can't see any way it would 
break any existing code.


From roy at panix.com  Sat Sep  3 12:59:59 2011
From: roy at panix.com (Roy Smith)
Date: Sat, 03 Sep 2011 12:59:59 -0400
Subject: [Python-ideas] allow line break at operators
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<mailman.688.1314941609.27778.python-list@python.org>
Message-ID: <roy-8F9B92.12595803092011@news.panix.com>

In article <mailman.688.1314941609.27778.python-list at python.org>,
 Matt Joiner <anacrolix at gmail.com> wrote:

> I guess the issue here is that you can't tell if an expression is
> complete without checking the indent of the following line. This is
> likely not desirable.

I wrote a weird bug the other day.  I had a function that returned a 
4-tuple and wanted to unpack it, so I wrote:

    var1,
    var2,
    var3,
    var4 = my_function()

which isn't a syntax error, but also isn't what I meant.  Depending on 
whether var[123] have pre-existing values, this doesn't even produce a 
run-time error.  Emacs encouraged me in this crime by merrily 
auto-indenting the code the way I expected :-)


From malaclypse2 at gmail.com  Sat Sep  3 13:08:26 2011
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Sat, 3 Sep 2011 13:08:26 -0400
Subject: Reading pen drive data
In-Reply-To: <4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
References: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>
	<4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
Message-ID: <CADwdpyYuu8cXSokzh_U_W20zmZF5fiWb1fv-eT7Q3nFN=4mdvg@mail.gmail.com>

On Sat, Sep 3, 2011 at 12:21 PM, mukesh tiwari <mukeshtiwari.iiitm at gmail.com
> wrote:

> I am getting
> Traceback (most recent call last):
>  File "Mount.py", line 7, in <module>
>    observer = QUDevMonitorObserver(monitor)
> NameError: name 'QUDevMonitorObserver' is not defined
>
> Could any one please tell me how to avoid this error .
>

It looks to me like that should be pyudev.QUDevMonitorObserver, shouldn't
it?

-- 
Jerry
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From python at mrabarnett.plus.com  Sat Sep  3 13:16:01 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 03 Sep 2011 18:16:01 +0100
Subject: Reading pen drive data
In-Reply-To: <4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
References: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>
	<4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
Message-ID: <4E6260D1.4010905@mrabarnett.plus.com>

On 03/09/2011 17:21, mukesh tiwari wrote:
> On Sep 3, 7:40 pm, mukesh tiwari<mukeshtiwari.ii... at gmail.com>  wrote:
>> Hello all
>> I am trying to write a python script which can mount a pen drive and
>> read the data from pen drive. I am using pyudev [http://packages.python.org/pyudev/api/index.html] and wrote a small
>> python code
>>
>> import pyudev, sys
>> if __name__ =="__main__":
>>          context = pyudev.Context()
>>          devices = context.list_devices(subsystem        ="usb")
>>          for device in devices :
>>                  print device
>>
>> which prints
>>
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')
>>
>> My problem is,  how to know  out of these usb which one to read . The
>> other solution I got is whenever I insert the pen drive , my system
>> mounts  it in /media  directory so I can read the /media directory  to
>> check if its empty or not but this does not seems promising to me
>> because it may be possible that my system is not able to mount the pen
>> drive so I have to manually do it .  Kindly some one please tell me
>> how to solve this problem.
>
> I got this link and its working fine [ http://packages.python.org/pyudev/api/monitor.html
> ]
>>>> context = pyudev.Context()
>>>> monitor = pyudev.Monitor.from_netlink(context)
>>>> monitor.filter_by(subsystem='input')
>>>> for action, device in monitor:
> ...     print('{0}: {1}'.format(action, device))
>
> but when I am trying to execute code [ http://packages.python.org/pyudev/api/toolkit.html
> ]
>
> import pyudev, sys
>
> context = pyudev.Context()
> monitor = pyudev.Monitor.from_netlink(context)
> monitor.filter_by(subsystem='usb')
> observer = QUDevMonitorObserver(monitor)
> def device_connected(device):
>       print('{0!r} added'.format(device))
> observer.deviceAdded.connect(device_connected)
> monitor.start()
>
> I am getting
> Traceback (most recent call last):
>    File "Mount.py", line 7, in<module>
>      observer = QUDevMonitorObserver(monitor)
> NameError: name 'QUDevMonitorObserver' is not defined
>
> Could any one please tell me how to avoid this error .
> Thank you

I think you need to import it from pyudev.pyqt4.


From d_vineet at yahoo.com  Sat Sep  3 13:23:17 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Sat, 3 Sep 2011 10:23:17 -0700 (PDT)
Subject: framework suggestions for Ben
Message-ID: <1315070597.66606.YahooMailNeo@web160520.mail.bf1.yahoo.com>

>Folks,
>I need some advice on a python web & database framework to use...?
>I have handcrafted a sqllite3 python script, that is a basic web application, interfacing with a >sqlite3 database...

It depends on whether you want to develop?desktop apps or browser-based apps.
I will suggest 2 frameworks with their urls.
I will not enumerate the features?here,?because their?websites?contain loads of advocacy about them.
?
=========
For desktop apps, my STRONG advise to you is DABO.
http://dabodev.com/
It is developed by the experts in data-centric business apps.
It contains the features which I haven't seen in any other framework except MS VFP & cursor adapter?(if at all you are familiar with them).
========
For browser based apps, I found web2py very simple yet powerful.
http://web2py.com/
?
It requires no installation (not even python).
Everything works out of the box.
No dependencies.
=========
?
Hope this helps.
:)
Vineet
......
>- Ben
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From mithrandi at mithrandi.net  Sat Sep  3 13:26:22 2011
From: mithrandi at mithrandi.net (Tristan Seligmann)
Date: Sat, 3 Sep 2011 19:26:22 +0200
Subject: [ANN] Pyflakes 0.5.0
Message-ID: <CAMcKhMQy_fnb13Co0s6y+LKgsizeMJTUFqGaPQocaUT0N=VgGQ@mail.gmail.com>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

It is my unexpected pleasure to announce the release of Pyflakes
0.5.0, the first release in several years, and available now from
PyPI[1].

Highlights of this release include the use of the built-in AST instead
of the compiler module, and support for various new syntax constructs
in Python 2.7. Note that development of Pyflakes (as well as the other
divmod.org projects) has moved to Launchpad[2] since the last release.

[1] http://pypi.python.org/packages/source/p/pyflakes/pyflakes-0.5.0.tar.gz#md5=568dab27c42e5822787aa8a603898672

[2] https://launchpad.net/pyflakes
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From milleja46 at gmail.com  Sat Sep  3 13:54:15 2011
From: milleja46 at gmail.com (Joshua Miller)
Date: Sat, 3 Sep 2011 13:54:15 -0400
Subject: IDLE from python 3.2 constantly crashes
Message-ID: <CAKoEMEfVjUuCBEOfCvQUSh4kZ=KMMYqQBvsfZqNKg1cOgJgQ0A@mail.gmail.com>

Ok i've been using IDLE on my home computer and everytime i try and
open a file that i saved to my hdd instead of my flashdrive(because
it's a school project) by accident, it opens for a second and i try to
do something else like open another file and it crashes. Is there
anyway to remedy this error?

By the way i'm running python 3.2 on windows 7 if it makes a difference


From nagle at animats.com  Sat Sep  3 14:10:06 2011
From: nagle at animats.com (John Nagle)
Date: Sat, 03 Sep 2011 11:10:06 -0700
Subject: SSL module needs issuer information
Message-ID: <4e626d97$0$1665$742ec2ed@news.sonic.net>

   The SSL module still doesn't return much information from the
certificate.  SSLSocket.getpeercert only returns a few basic items
about the certificate subject.  You can't retrieve issuer information,
and you can't get the extensions needed to check if a cert is an EV cert.

   With the latest flaps about phony cert issuers, it's worth
having issuer info available.  It was available in the old M2Crypto
module, but not in the current Python SSL module.

				John Nagle


From ian.g.kelly at gmail.com  Sat Sep  3 14:50:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 3 Sep 2011 12:50:14 -0600
Subject: Functions vs OOP
In-Reply-To: <j3tjov$c30$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <CALwzid=kbZYux0k3vs7y6zr9FRu2GBDJ=1-cm8=4BgYNcYpRUQ@mail.gmail.com>

On Sat, Sep 3, 2011 at 10:15 AM, William Gill <noreply at domain.invalid> wrote:
> During some recent research, and re-familiarization with Python, I came
> across documentation that suggests that programming using functions, and
> programming using objects were somehow opposing techniques.
>
> It seems to me that they are complimentary. ?It makes sense to create
> objects and have some functions that take those objects as arguments. Are
> they suggesting that any function that takes an object as an argument should
> always be a method of that object? ?Conversely I can see creating functions
> that take raw input (e.g. strings) and return it in a format compatible with
> an object's constructor, rather than have objects accept any conceivable
> format for its constructor.
>
> Am I missing something, or am I taking things too literally?

I think you may be confusing "functional programming" and "programming
using functions".  These are not the same thing.

Functional programming is about using functions in the *mathematical*
sense.  A mathematical function maps one value (or tuple of values) to
another value.  The mapped value never varies; if it did, it would be
a different function.  So functional programming eschews the use of
functions where the results depend on any internal or external state
beyond the values of the passed-in arguments, such as the variable
state of the object the method is being called on.

Functional programming and OOP are not entirely opposed -- for
example, string methods in Python such as str.upper are perfectly
functional, since strings are immutable.  Many functional languages
such as Common LISP also have powerful OOP facilities.  Still,
functional programming does not fit well with the traditional OOP
model of objects passing messages to other objects, which generally
implies statefulness.

Cheers,
Ian


From paul at subsignal.org  Sat Sep  3 14:59:27 2011
From: paul at subsignal.org (=?ISO-8859-1?Q?Paul_K=F6lle?=)
Date: Sat, 03 Sep 2011 20:59:27 +0200
Subject: Need advice on Web / Database framework...
In-Reply-To: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
References: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
Message-ID: <j3ttet$fpn$1@dough.gmane.org>

Hi,

Am 03.09.2011 16:11, schrieb Benjamin Schollnick:
> Folks,
>
> I need some advice on a python web&  database framework to use...?
Hardest question ever ;)

>
> I have handcrafted a sqllite3 python script, that is a basic web
> application, interfacing with a sqlite3 database...
>
> But I am concerned at the thought of handcrafting a administration
> interface, and so forth.
If you are not familiar with the various pitfalls of web security I'd 
recomment a framework which has all the layers already integrated. Take 
a look at http://www.web2py.com, I think it's quite powerful and has 
good documentation.
If you want to get your hands dirty you can compose your own "framework" 
cherrypy+sqlalchemy+cheetah might be a good combination.

hth
  Paul



From tjreedy at udel.edu  Sat Sep  3 15:01:31 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:01:31 -0400
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
Message-ID: <j3ttjr$gta$1@dough.gmane.org>

On 9/3/2011 3:51 AM, Yingjie Lan wrote:
> I agree that long lines of code are not very common in many projects,
> though it might be the case with some heavily involved in math. For some
> reason, when the feature of free line breaking came about in computer
> languages, it is welcomed and generally well accepted.

Every language with blocks needs some mechanism to indicate the 
beginning and ending of blocks and of statements within blocks. If 
visible fences ('begin/end' or '{}') and statement terminators (';') are 
used, then '\n' can be treated as merely a space, as it is in C, for 
instance.

> Python uses indentation for blocks,

and it uses unescaped '\n' (with two escapement options) to terminate 
statements. This is fundamental to Python's design and goes along with 
significant indents.

 > and by the same mechanism, line breaking can be
> accommodated without requiring parenthesis or ending backslashes.

You need proof for your claim that indentation can be used for both jobs 
in the form of a grammar that works with Python's parser. I am dubious 
that you can do that with an indents *after* the newline.

Even if you could, it would be confusing for human readers. There would 
then be three ways to escape newline, with one doing double duty. And 
for what? Merely to avoid using either of the two methods already available.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep  3 15:15:28 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:15:28 -0400
Subject: Functions vs OOP
In-Reply-To: <4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j3tue0$m0i$1@dough.gmane.org>

On 9/3/2011 12:25 PM, Steven D'Aprano wrote:
> William Gill wrote:
>
>> During some recent research, and re-familiarization with Python, I came
>> across documentation

Ours, or someone else's?

>> that suggests that programming using functions, and
>> programming using objects were somehow opposing techniques.
>>
>> It seems to me that they are complimentary.  It makes sense to create
>> objects and have some functions that take those objects as arguments.
>
> Python is a mixed paradigm language, with object, functional and imperative
> paradigms.
>
>> Are they suggesting that any function that takes an object as an
>> argument should always be a method of that object?

Or of the class of the object.

> Yes.
> http://steve-yegge.blogspot.com/2006/03/execution-in-kingdom-of-nouns.html

Since in Python, everything is an object, that would mean that every 
function has to be a method, which would mean creating classes just to 
have a class to attach functions to. How awful. (Oh, right, I believe I 
just described Java.)

>> Am I missing something, or am I taking things too literally?
>
> No, it is the OO purists who are missing something.

Yes, Python.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep  3 15:20:52 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:20:52 -0400
Subject: IDLE from python 3.2 constantly crashes
In-Reply-To: <CAKoEMEfVjUuCBEOfCvQUSh4kZ=KMMYqQBvsfZqNKg1cOgJgQ0A@mail.gmail.com>
References: <CAKoEMEfVjUuCBEOfCvQUSh4kZ=KMMYqQBvsfZqNKg1cOgJgQ0A@mail.gmail.com>
Message-ID: <j3tuo4$o09$1@dough.gmane.org>

On 9/3/2011 1:54 PM, Joshua Miller wrote:
> Ok i've been using IDLE on my home computer and everytime i try and
> open a file that i saved to my hdd instead of my flashdrive(because
> it's a school project) by accident, it opens for a second and i try to
> do something else like open another file and it crashes. Is there
> anyway to remedy this error?
>
> By the way i'm running python 3.2 on windows 7 if it makes a difference

Since I and others am using the same (3.2 on Win 7) quite successfully, 
it is hard to know what the problem is with your setup. Start with more 
details of exactly what you do and what 'it crashes' means.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep  3 15:23:13 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:23:13 -0400
Subject: SSL module needs issuer information
In-Reply-To: <4e626d97$0$1665$742ec2ed@news.sonic.net>
References: <4e626d97$0$1665$742ec2ed@news.sonic.net>
Message-ID: <j3tush$o09$2@dough.gmane.org>

On 9/3/2011 2:10 PM, John Nagle wrote:
> The SSL module still doesn't return much information from the
> certificate. SSLSocket.getpeercert only returns a few basic items
> about the certificate subject. You can't retrieve issuer information,
> and you can't get the extensions needed to check if a cert is an EV cert.
>
> With the latest flaps about phony cert issuers, it's worth
> having issuer info available. It was available in the old M2Crypto
> module, but not in the current Python SSL module.

Check the tracker to see if there is an issue about this already. If 
not, open one with a specific feature request.

-- 
Terry Jan Reedy



From noreply at domain.invalid  Sat Sep  3 17:09:03 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:09:03 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.736.1315067353.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.736.1315067353.27778.python-list@python.org>
Message-ID: <j3u4vv$5ho$1@dont-email.me>

On 9/3/2011 12:29 PM, MRAB wrote:
> I think you mean "complementary". :-)
How polite of you to point out my spelling deficiency.  I guess 
shouldn't be watching football while typing (I'm sure the beer didn't 
help either).

> I think that it's all about "state".
>
> In functional programming, there's no state; a function's result
> depends solely on its arguments, so it will always return the same
> result for the same given arguments.
>
> In OOP, on the other hand, an object often has a state; a method may
> return a different result each time it's called, even for the same
> given arguments.

I think you mean "it [sic, a function] will "return the same result for 
the same given values..."

     x=1
     y= myFn(x)

will return the same result as

     y= myFn(1)

A method may use an attribute as an implicit argument, and that 
attribute's value change, just like the value of x (above) may change. 
It may or may not return anything (it may just modify an attribute).

The question wasn't about encapsulation, it was about programming 
paradigms, and if they conflict.

As was pointed out elsewhere, I may have just confused "functional 
programming" with "programming using functions".




From noreply at domain.invalid  Sat Sep  3 17:13:06 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:13:06 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.743.1315075846.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
Message-ID: <j3u57g$742$1@dont-email.me>

On 9/3/2011 2:50 PM, Ian Kelly wrote:

> I think you may be confusing "functional programming" and "programming
> using functions".  These are not the same thing.
>

I think you may be right, Ian.  It didn't make much sense




From noreply at domain.invalid  Sat Sep  3 17:34:05 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:34:05 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.746.1315077390.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
Message-ID: <j3u6es$e6i$1@dont-email.me>

On 9/3/2011 3:15 PM, Terry Reedy wrote:
>> William Gill wrote:
>>
>>> During some recent research, and re-familiarization with Python, I came
>>> across documentation
>
> Ours, or someone else's?

Python.

>
> Since in Python, everything is an object, that would mean that every
> function has to be a method, which would mean creating classes just to
> have a class to attach functions to. How awful.

Exactly why I asked, but I realize the the mistake was mine.  I think 
they were talking about "functional programming" not "using functions in 
an OO program."



From ben+python at benfinney.id.au  Sat Sep  3 17:39:30 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 04 Sep 2011 07:39:30 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
Message-ID: <87bov1qp9p.fsf@benfinney.id.au>

William Gill <noreply at domain.invalid> writes:

> On 9/3/2011 3:15 PM, Terry Reedy wrote:
> >> William Gill wrote:
> >>
> >>> During some recent research, and re-familiarization with Python, I
> >>> came across documentation
> >
> > Ours, or someone else's?
>
> Python.

Can you show exactly where in the Python documentation you found the
passage which confused you?

-- 
 \           ?If you're a cowboy and you're dragging a guy behind your |
  `\      horse, I bet it would really make you mad if you looked back |
_o__)                and the guy was reading a magazine.? ?Jack Handey |
Ben Finney


From nospam at domain.invalid  Sat Sep  3 17:58:01 2011
From: nospam at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:58:01 -0400
Subject: Functions vs OOP
In-Reply-To: <87bov1qp9p.fsf@benfinney.id.au>
References: <j3tjov$c30$1@dont-email.me>	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>	<mailman.746.1315077390.27778.python-list@python.org>	<j3u6es$e6i$1@dont-email.me>
	<87bov1qp9p.fsf@benfinney.id.au>
Message-ID: <j3u7tc$kcq$1@dont-email.me>

On 9/3/2011 5:39 PM, Ben Finney wrote:
> William Gill<noreply at domain.invalid>  writes:
>
>> On 9/3/2011 3:15 PM, Terry Reedy wrote:
>>>> William Gill wrote:
>>>>
>>>>> During some recent research, and re-familiarization with Python, I
>>>>> came across documentation
>>>
>>> Ours, or someone else's?
>>
>> Python.
>
> Can you show exactly where in the Python documentation you found the
> passage which confused you?
>
Sorry, no.  I tried to locate the exact reference again, and couldn't 
remember where I read it (short term memory problems).


From bkasterm at gmail.com  Sat Sep  3 18:15:18 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Sat, 03 Sep 2011 16:15:18 -0600
Subject: Tkinter label height to fit content
Message-ID: <87mxelgtmx.fsf@gmail.com>


I have a label into which I am going to put content of different
sizes. I would like to know how high I need to make the label so that I
can size the window so it can stay the same for the different content
sizes. I have a strategy, but it seems more complicated then it should
be.

I want to set a label to a given width and wraplength:

l = Label(root)
l['width'] = 30
l['wraplength'] = 244
l['text'] = "testing this"

Now I want to query the label to find how many lines are
used. l['height'] stays at 0, so the best I have been able to come up
with is to use l.winfo_height() and convert the height given in pixels
to the number of lines used. Nothing in dir(l) seems to give me the
information directly, but this strategy is fragile to font changes and
other changes.

Any suggestions?


From PointedEars at web.de  Sat Sep  3 18:58:15 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Sun, 04 Sep 2011 00:58:15 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
	<6545843.yvFAXZvWTv@PointedEars.de>
	<9c528rFi5aU1@mid.individual.net>
	<4761603.ypaU67uLZW@PointedEars.de>
	<9c6d4cFa54U1@mid.individual.net>
Message-ID: <109595831.VCN276Cjj6@PointedEars.de>

Fokke Nauta wrote:

> "Thomas 'PointedEars' Lahn" [?]:
>> Fokke Nauta wrote:
>>> "Thomas 'PointedEars' Lahn" [?] wrote:
>>>> The Python shell executes Python code.  The above obviously is not
>>>> Python
>>>> code, but *system* shell commands.  So let the *system* command shell
>>>> execute them (as indicated by the `$' prompt, which is customary for a
>>>> sh-based UNIX/Linux shell prompt).
>>> I know. I worked with SCO Unix and various sorts of Linux.
>>> But never with Python, so I hadn't got a clue about the prompt.
>> Come on, with that experience you see a `$' and those commands and don't
>> realize it is (ba)sh?
> 
> Ofcourse I realized it was Unix/Linux. I already could tell that as the
> packages I downloaded were tar.gz files.

For *Windows*?

> So I unpacked them and expected to run a Python installer script from the
> Python command line.

Again, given all that experience you claim to have, how come it did not 
occur to you that the `$' was meant to be a *command* *shell* prompt?  Other 
OSes have command shells, too, you know; they are just named and run 
differently.

> Tried to run the Python installer script from the DOS command line but
> that resulted in an error.

"There was an error" is no error report at all.
 
>>>> However, you appear to have found the *UNIX/Linux* README (and the
>>>> corresponding version?) of that server: the second command is usually
>>>> how you would run a program as daemon on Unices (run through an init
>>>> script), while on Windows NT (like XP) you would have a setup program
>>>> install a service for you (maybe to execute that command when the
>>>> service is started).  Look for the Windows version.
>>> There is no other Windows version except the packages I mentioned,
>>> PyWebDAV and PyXML. The only Windows thing I got was the Python
>>> interpreter itself.
>> Has it not occurred to you to STFW for "easy_install" first?
> 
> What do you mean by STFW?

Search The F****ing Web.

> I wasn't aware that easy_install was a utility. Downloaded and installed
> the Windows version and run easy_install pywebdav.
> It downloaded something, installed something and finished something.
> But, once again, don't know how to proceed.

RTFM.

>>>>> And there is no easy_install script in the PyXML-0.8.4
>>>>> directory, only a setup.py and ez_setup.py script. I guess the latter
>>>>> is
>>>>> the one to use. But how?
>>>> RTFM.
>>> Which fucking manual?
>> That of the server, on Windows-related information.  Or that of
>> easy_install.  Or Python.  Whichever comes first.
> 
> It's my own server and I didn't write a manual for it.

No, the people providing it for you obviously did, but you do not seem to 
care to read it.

> In the manual of Easy_install it says how to install packaged etc and I
> did sucessfully.
> There is no furter information as how to proceed.

Either you are lying, or you are really forgetful, or you are simply not 
smart enough for this.  You yourself told me/us before what the next step 
is:

>>>>> How do I proceed next?
>>>> Look for the Windows version.  If there is none, get easy_install and
>>>> use
>>>> it as described.
> 
> I did and it worked. What's next?

Start the now-installed server, for goodness' sake!

Observing this, be reminded that playing stupid does not work with me:

<http://catb.org/~esr/faqs/smart-questions.html>

And please get rid of that attribution novel and trim your quotes to the 
relevant minimum.  I am asking you the last time here.  If you cannot find 
it within you to think about your readers when you post, you are not worth 
my attention or (free) time.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From lanyjie at yahoo.com  Sat Sep  3 19:22:57 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 16:22:57 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <j3ttjr$gta$1@dough.gmane.org>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<j3ttjr$gta$1@dough.gmane.org>
Message-ID: <1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>

>?Every language with blocks needs some mechanism to indicate the beginning and ending of blocks and of statements within blocks. If visible fences ('begin/end' or '{}') and statement terminators (';') are used, then '\n' can be treated as merely a space, as it is in C, for instance.?

>?and it uses unescaped '\n' (with two escapement options) to terminate statements. This is fundamental to Python's design and goes along with significant indents.

Agreed.?Currently indentation in Python starts a new block,?but if you view it from the perspective of line breaking,?it also functions as if the line is continued. The line of code below

if condition: do_a(); do_b()

can be ?written as:

if condition: #line breaks
do_a(); # ';' is optional here?
do_b() # continue

That indentation can be also employed for line breaking is quite evident to me. During the open email correspondence with Stephen, it seems to be a tenable point.?

>?There would then be three ways to escape newline, with one doing double duty. And for what? Merely to avoid using either of the two methods already available.

I believe the other two ways are not as good as this new way. As the proposal is fully backward compatible, people may choose whatever way they prefer.?


>________________________________
>From: Terry Reedy <tjreedy at udel.edu>
>To: python-list at python.org
>Cc: python-ideas at python.org
>Sent: Sunday, September 4, 2011 3:01 AM
>Subject: Re: [Python-ideas] allow line break at operators
>
>On 9/3/2011 3:51 AM, Yingjie Lan wrote:
>> I agree that long lines of code are not very common in many projects,
>> though it might be the case with some heavily involved in math. For some
>> reason, when the feature of free line breaking came about in computer
>> languages, it is welcomed and generally well accepted.
>
>Every language with blocks needs some mechanism to indicate the beginning and ending of blocks and of statements within blocks. If visible fences ('begin/end' or '{}') and statement terminators (';') are used, then '\n' can be treated as merely a space, as it is in C, for instance.
>
>> Python uses indentation for blocks,
>
>and it uses unescaped '\n' (with two escapement options) to terminate statements. This is fundamental to Python's design and goes along with significant indents.
>
>> and by the same mechanism, line breaking can be
>> accommodated without requiring parenthesis or ending backslashes.
>
>You need proof for your claim that indentation can be used for both jobs in the form of a grammar that works with Python's parser. I am dubious that you can do that with an indents *after* the newline.
>
>Even if you could, it would be confusing for human readers. There would then be three ways to escape newline, with one doing double duty. And for what? Merely to avoid using either of the two methods already available.
>
>-- Terry Jan Reedy
>
>-- http://mail.python.org/mailman/listinfo/python-list
>
>
>
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From gelonida at gmail.com  Sat Sep  3 20:15:32 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 04 Sep 2011 02:15:32 +0200
Subject: SSL module needs issuer information
In-Reply-To: <4e626d97$0$1665$742ec2ed@news.sonic.net>
References: <4e626d97$0$1665$742ec2ed@news.sonic.net>
Message-ID: <j3ufv5$k1t$1@dough.gmane.org>

Hi John,

On 09/03/2011 08:10 PM, John Nagle wrote:
>   The SSL module still doesn't return much information from the
> certificate.  SSLSocket.getpeercert only returns a few basic items
> about the certificate subject.  You can't retrieve issuer information,
> and you can't get the extensions needed to check if a cert is an EV cert.
> 
>   With the latest flaps about phony cert issuers, it's worth
> having issuer info available.  It was available in the old M2Crypto
> module, but not in the current Python SSL module.

Your phrasing 'old M2Crypto' disturbs me slightly.

I am using Python 2.6. Is M2Crypto also obsolete for python 2.6?

Is there any serious alternative if I want to verify the server
certificate in a safe way (and if I want to send a client certificate)??


I am in search for a set of libraries, which allows me to:

- verify the server certificate (ideally via a custom call back, which
can inspect the certificate data and then decide whether the certificate
shall be accepted or not)
	
- send a client certificate

- use https with a cookie jar (ideally even persistent, but session
cookies are enough)

- do XMLRPC calls (but send cookies in the headers)

Would m2crypto be the right choice?




From gelonida at gmail.com  Sat Sep  3 20:18:34 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 04 Sep 2011 02:18:34 +0200
Subject: Need advice on Web / Database framework...
In-Reply-To: <j3ttet$fpn$1@dough.gmane.org>
References: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
	<j3ttet$fpn$1@dough.gmane.org>
Message-ID: <j3ug4q$k1t$2@dough.gmane.org>

Hi Paul,

On 09/03/2011 08:59 PM, Paul K?lle wrote:
> Am 03.09.2011 16:11, schrieb Benjamin Schollnick:
>> Folks,
>>
>> I need some advice on a python web&  database framework to use...?
> Hardest question ever ;)
. . .
>> But I am concerned at the thought of handcrafting a administration
>> interface, and so forth.
> If you are not familiar with the various pitfalls of web security I'd
> recomment a framework which has all the layers already integrated. Take
> a look at http://www.web2py.com, I think it's quite powerful and has
> good documentation.
> If you want to get your hands dirty you can compose your own "framework"
> cherrypy+sqlalchemy+cheetah might be a good combination.
> 

How does web2py compare to django? I just started playing with django,
but don't know web2py




From rantingrick at gmail.com  Sat Sep  3 21:15:52 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 3 Sep 2011 18:15:52 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
Message-ID: <69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>

On Sep 3, 5:15?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> Any suggestions?

Yeah, have you considered using the "linespace()" method of tk.Font
objects to calculate the height? Although i must say it "feels" as if
your doing something you should not need to do, however i cannot be
sure without knowing more about this GUI. Sounds a lot like trying to
put socks on a rooster.

http://infohost.nmt.edu/tcc/help/pubs/tkinter/std-attrs.html#fonts


From tjreedy at udel.edu  Sat Sep  3 21:51:37 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 21:51:37 -0400
Subject: Functions vs OOP
In-Reply-To: <j3u6es$e6i$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
Message-ID: <j3ulkp$e3o$1@dough.gmane.org>

On 9/3/2011 5:34 PM, William Gill wrote:
> On 9/3/2011 3:15 PM, Terry Reedy wrote:
>>> William Gill wrote:
>>>
>>>> During some recent research, and re-familiarization with Python, I came
>>>> across documentation
>>
>> Ours, or someone else's?
>
> Python.
>
>>
>> Since in Python, everything is an object, that would mean that every
>> function has to be a method, which would mean creating classes just to
>> have a class to attach functions to. How awful.
>
> Exactly why I asked, but I realize the the mistake was mine. I think
> they were talking about "functional programming" not "using functions in
> an OO program."

It is possible that our doc was less than crystal clear. We are 
constantly improving it where we can see fixable faults. If you run 
across whatever it was and it still seems a bit muddy, post something again.

-- 
Terry Jan Reedy



From python at mrabarnett.plus.com  Sat Sep  3 22:04:54 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 04 Sep 2011 03:04:54 +0100
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<j3ttjr$gta$1@dough.gmane.org>
	<1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>
Message-ID: <4E62DCC6.8000906@mrabarnett.plus.com>

On 04/09/2011 00:22, Yingjie Lan wrote:
>>  Every language with blocks needs some mechanism to indicate the
> beginning and ending of blocks and of statements within blocks. If
> visible fences ('begin/end' or '{}') and statement terminators (';') are
> used, then '\n' can be treated as merely a space, as it is in C, for
> instance.
>>  and it uses unescaped '\n' (with two escapement options) to terminate
> statements. This is fundamental to Python's design and goes along with
> significant indents.
>
> Agreed. Currently indentation in Python starts a new block, but if you
> view it from the perspective of line breaking, it also functions as if
> the line is continued. The line of code below
>
> if condition: do_a(); do_b()
>
> can be written as:
>
> if condition: #line breaks
> do_a(); # ';' is optional here
> do_b() # continue
>
> That indentation can be also employed for line breaking is quite evident
> to me. During the open email correspondence with Stephen, it seems to be
> a tenable point.
>
>  > There would then be three ways to escape newline, with one doing
> double duty. And for what? Merely to avoid using either of the two
> methods already available.
>
> I believe the other two ways are not as good as this new way. As the
> proposal is fully backward compatible, people may choose whatever way
> they prefer.
>
I think that the rules would be:

If a line ends with a colon and the next line is indented, then it's
the start of a block, and the following lines which belong to that
block have the same indent.

If a line doesn't end with a colon but the next line is indented, then
it's the start of a continuation, and the following lines which belong
to that continuation have the same indent.

In both cases there could be blocks nested in blocks and possibly
continuations nested in continuations, as well as blocks nested in
continuations and continuations nested in blocks.

I'm not sure what the effect would be if you had mis-indented lines.
For example, if a line was accidentally indented after a comment, then
it would be treated as part of the comment. It's in cases like those
that syntax colouring would be helpful. It would be a good idea to use
an editor which could indicate in some way when a line is a
continuation.

>     ------------------------------------------------------------------------
>     *From:* Terry Reedy <tjreedy at udel.edu>
>     *To:* python-list at python.org
>     *Cc:* python-ideas at python.org
>     *Sent:* Sunday, September 4, 2011 3:01 AM
>     *Subject:* Re: [Python-ideas] allow line break at operators
>
>     On 9/3/2011 3:51 AM, Yingjie Lan wrote:
>      > I agree that long lines of code are not very common in many projects,
>      > though it might be the case with some heavily involved in math.
>     For some
>      > reason, when the feature of free line breaking came about in computer
>      > languages, it is welcomed and generally well accepted.
>
>     Every language with blocks needs some mechanism to indicate the
>     beginning and ending of blocks and of statements within blocks. If
>     visible fences ('begin/end' or '{}') and statement terminators (';')
>     are used, then '\n' can be treated as merely a space, as it is in C,
>     for instance.
>
>      > Python uses indentation for blocks,
>
>     and it uses unescaped '\n' (with two escapement options) to
>     terminate statements. This is fundamental to Python's design and
>     goes along with significant indents.
>
>      > and by the same mechanism, line breaking can be
>      > accommodated without requiring parenthesis or ending backslashes.
>
>     You need proof for your claim that indentation can be used for both
>     jobs in the form of a grammar that works with Python's parser. I am
>     dubious that you can do that with an indents *after* the newline.
>
>     Even if you could, it would be confusing for human readers. There
>     would then be three ways to escape newline, with one doing double
>     duty. And for what? Merely to avoid using either of the two methods
>     already available.
>



From noreply at domain.invalid  Sat Sep  3 22:18:19 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 22:18:19 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.752.1315101158.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
	<mailman.752.1315101158.27778.python-list@python.org>
Message-ID: <j3un3p$edj$1@dont-email.me>

On 9/3/2011 9:51 PM, Terry Reedy wrote:
>
> It is possible that our doc was less than crystal clear. We are
> constantly improving it where we can see fixable faults. If you run
> across whatever it was and it still seems a bit muddy, post something
> again.
>
Will do.

Thanks.


From shilparani9030 at gmail.com  Sat Sep  3 23:14:29 2011
From: shilparani9030 at gmail.com (SHILPA)
Date: Sat, 3 Sep 2011 20:14:29 -0700 (PDT)
Subject: KATRINA KAIF RARE PHOTOS
Message-ID: <66624c9c-94ca-44a1-a6f1-fc67871b334b@r40g2000prf.googlegroups.com>

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From jehugaleahsa at gmail.com  Sat Sep  3 23:35:24 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Sat, 3 Sep 2011 20:35:24 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
	<18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
	<j3sapp01jeh@news1.newsguy.com>
Message-ID: <112f5d1d-fbf7-44da-a0dd-cbbeb3a59c6d@dq7g2000vbb.googlegroups.com>

On Sep 3, 12:35?am, Chris Torek <nos... at torek.net> wrote:
> In article <18fe4afd-569b-4580-a629-50f6c7482... at c29g2000yqd.googlegroups.com>
> Travis Parks ?<jehugalea... at gmail.com> wrote:
>
> >[Someone] commented that the itertools algorithms will perform
> >faster than the hand-written ones. Are these algorithms optimized
> >internally?
>
> They are written in C, so avoid a lot of CPython interpreter
> overhead. ?Mileage in Jython, etc., may vary...
> --
> In-Real-Life: Chris Torek, Wind River Systems
> Intel require I note that my opinions are not those of WRS or Intel
> Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W) ?+1 801 277 2603
> email: gmail (figure it out) ? ? ?http://web.torek.net/torek/index.html

I thought I would point out that many of the itertools functions
change between 2.x and 3.x versions. Since 2.7 is supposed to be the
last 2.x language, I suppose I will wait until 3.2 becomes the norm
before I incorporate some of these changes. In the mean time, I will
starting working on algorithms that work against Sequences.

I think a really important lesson is that Python really doesn't need
an algorithms library, like many others do. A lot of the common
algorithms are supported by the syntax itself. All my library did was
allow for easier function composition.


From d_vineet at yahoo.com  Sun Sep  4 01:03:08 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Sat, 3 Sep 2011 22:03:08 -0700 (PDT)
Subject: my suggestions for framework
Message-ID: <1315112588.16268.YahooMailNeo@web160517.mail.bf1.yahoo.com>

> recomment a framework which has all the layers already integrated. Take
> a look at http://www.web2py.com, I think it's quite powerful and has
> good documentation.
> If you want to get your hands dirty you can compose your own "framework"
> cherrypy+sqlalchemy+cheetah might be a good combination.
> 

How does web2py compare to django? I just started playing with django,
but don't know web2py

----

IMHO, django is suitable for CMS kind of apps.
AFAIK, originally it was written for a newspaper website, subsequently it has grown over the time.
I have tried turbogears(TG), django & web2py.

TG is like picking all good eggs from different open source projects. It integrates sqlalchemy, genshi, cheetah, pylons, for sql abstraction layer, templating system, web server respectively.
One can choose other options also, if desired.
-1 for TG is its complexity and not-so-good docs, too many dependencies.
?
django has very good docs & active community.
It is better in terms of simplicity & dependency?as compared to TG.
?
web2py is vastly flexible, no dependencies, no installation required, just plug & play, very good community & docs.
Honestly, I did not find any -1 for web2py.
?
Of course, one has to form his/her own opinion.
On stackoverflow.com, there are plenty of threads which compare the python frameworks.
?
:-)
---Vineet
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From tinnews at isbd.co.uk  Sun Sep  4 04:13:49 2011
From: tinnews at isbd.co.uk (tinnews at isbd.co.uk)
Date: Sun, 4 Sep 2011 09:13:49 +0100
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
Message-ID: <tiobj8-sng.ln1@chris.zbmc.eu>

Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Sat, Sep 3, 2011 at 10:15 AM, William Gill <noreply at domain.invalid> wrote:
> > During some recent research, and re-familiarization with Python, I came
> > across documentation that suggests that programming using functions, and
> > programming using objects were somehow opposing techniques.
> >
> > It seems to me that they are complimentary. ?It makes sense to create
> > objects and have some functions that take those objects as arguments. Are
> > they suggesting that any function that takes an object as an argument should
> > always be a method of that object? ?Conversely I can see creating functions
> > that take raw input (e.g. strings) and return it in a format compatible with
> > an object's constructor, rather than have objects accept any conceivable
> > format for its constructor.
> >
> > Am I missing something, or am I taking things too literally?
> 
> I think you may be confusing "functional programming" and "programming
> using functions".  These are not the same thing.
> 
> Functional programming is about using functions in the *mathematical*
> sense.  A mathematical function maps one value (or tuple of values) to
> another value.  The mapped value never varies; if it did, it would be
> a different function.  So functional programming eschews the use of
> functions where the results depend on any internal or external state
> beyond the values of the passed-in arguments, such as the variable
> state of the object the method is being called on.
> 
I think there may be another issue here.  If someone says "functional
programming" to me then I would generally assume that they *do* mean
"programming using functions".  While your distinction of the two may
be strictly correct I don't think it's the generally accepted meaning.

-- 
Chris Green


From fnautaNO at SPAMsolfon.nl  Sun Sep  4 04:59:41 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Sun, 4 Sep 2011 10:59:41 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
	<6545843.yvFAXZvWTv@PointedEars.de>
	<9c528rFi5aU1@mid.individual.net>
	<4761603.ypaU67uLZW@PointedEars.de>
	<9c6d4cFa54U1@mid.individual.net>
	<109595831.VCN276Cjj6@PointedEars.de>
Message-ID: <9cgsvvFdhuU1@mid.individual.net>


"Thomas 'PointedEars' Lahn" <PointedEars at web.de> wrote in message 
news:109595831.VCN276Cjj6 at PointedEars.de...

<cut>

If you don't have anything better to contribute, please stop answering.

Es gen?gt schon.

Fokke 




From adam.jorgensen.za at gmail.com  Sun Sep  4 05:05:32 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Sun, 4 Sep 2011 11:05:32 +0200
Subject: Functions vs OOP
In-Reply-To: <j3un3p$edj$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
	<mailman.752.1315101158.27778.python-list@python.org>
	<j3un3p$edj$1@dont-email.me>
Message-ID: <CAMX1Rom9Y9xy+SGe6Sjm_r56t1DUM1PssCb1pWJ3TL8wvuKcyQ@mail.gmail.com>

Progranming with functions vs Progranming with objects sounds like C vs. C++
more than functional programming vs. OO programming

On 4 September 2011 04:18, William Gill <noreply at domain.invalid> wrote:

> On 9/3/2011 9:51 PM, Terry Reedy wrote:
>
>>
>> It is possible that our doc was less than crystal clear. We are
>> constantly improving it where we can see fixable faults. If you run
>> across whatever it was and it still seems a bit muddy, post something
>> again.
>>
>>  Will do.
>
> Thanks.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
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From lanyjie at yahoo.com  Sun Sep  4 05:58:08 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sun, 4 Sep 2011 02:58:08 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <4E62DCC6.8000906@mrabarnett.plus.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<j3ttjr$gta$1@dough.gmane.org>
	<1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<4E62DCC6.8000906@mrabarnett.plus.com>
Message-ID: <1315130288.86666.YahooMailNeo@web121515.mail.ne1.yahoo.com>


>
Thanks, I think that's the rule described in its full glory. Currently I am not ?quite sure of the use case for continuation nested in continuation -- it seems to be still a single continuation, but it allows for some additional freedom in formatting the continued line. Do you have other use cases for that?


For the case of mis-indentation, as demonstrated in your scenario,?I think it is better that the rule is not applied to a comment?continued onto the next line. The effect of a '#' only carries to the end of a line, if one would like the next line to be a comment, just use another '#'. It remains to consider a mis-indentation that only involves code lines. However, that is not a new problem, so we should not worry (it is like a sunken cost).?

Sorry for top posting. It seems yahoo web email is not designed with such a use case in mind.


>________________________________
>From: MRAB <python at mrabarnett.plus.com>
>To: python-list at python.org
>Sent: Sunday, September 4, 2011 10:04 AM
>Subject: Re: [Python-ideas] allow line break at operators
>
>On 04/09/2011 00:22, Yingjie Lan wrote:
>>>? Every language with blocks needs some mechanism to indicate the
>> beginning and ending of blocks and of statements within blocks. If
>> visible fences ('begin/end' or '{}') and statement terminators (';') are
>> used, then '\n' can be treated as merely a space, as it is in C, for
>> instance.
>>>? and it uses unescaped '\n' (with two escapement options) to terminate
>> statements. This is fundamental to Python's design and goes along with
>> significant indents.
>>
>> Agreed. Currently indentation in Python starts a new block, but if you
>> view it from the perspective of line breaking, it also functions as if
>> the line is continued. The line of code below
>>
>> if condition: do_a(); do_b()
>>
>> can be written as:
>>
>> if condition: #line breaks
>> do_a(); # ';' is optional here
>> do_b() # continue
>>
>> That indentation can be also employed for line breaking is quite evident
>> to me. During the open email correspondence with Stephen, it seems to be
>> a tenable point.
>>
>>? > There would then be three ways to escape newline, with one doing
>> double duty. And for what? Merely to avoid using either of the two
>> methods already available.
>>
>> I believe the other two ways are not as good as this new way. As the
>> proposal is fully backward compatible, people may choose whatever way
>> they prefer.
>>
>I think that the rules would be:
>
>If a line ends with a colon and the next line is indented, then it's
>the start of a block, and the following lines which belong to that
>block have the same indent.
>
>If a line doesn't end with a colon but the next line is indented, then
>it's the start of a continuation, and the following lines which belong
>to that continuation have the same indent.
>
>In both cases there could be blocks nested in blocks and possibly
>continuations nested in continuations, as well as blocks nested in
>continuations and continuations nested in blocks.
>
>I'm not sure what the effect would be if you had mis-indented lines.
>For example, if a line was accidentally indented after a comment, then
>it would be treated as part of the comment. It's in cases like those
>that syntax colouring would be helpful. It would be a good idea to use
>an editor which could indicate in some way when a line is a
>continuation.
>
>>? ?  ------------------------------------------------------------------------
>>? ?  *From:* Terry Reedy <tjreedy at udel.edu>
>>? ?  *To:* python-list at python.org
>>? ?  *Cc:* python-ideas at python.org
>>? ?  *Sent:* Sunday, September 4, 2011 3:01 AM
>>? ?  *Subject:* Re: [Python-ideas] allow line break at operators
>>
>>? ?  On 9/3/2011 3:51 AM, Yingjie Lan wrote:
>>? ? ? > I agree that long lines of code are not very common in many projects,
>>? ? ? > though it might be the case with some heavily involved in math.
>>? ?  For some
>>? ? ? > reason, when the feature of free line breaking came about in computer
>>? ? ? > languages, it is welcomed and generally well accepted.
>>
>>? ?  Every language with blocks needs some mechanism to indicate the
>>? ?  beginning and ending of blocks and of statements within blocks. If
>>? ?  visible fences ('begin/end' or '{}') and statement terminators (';')
>>? ?  are used, then '\n' can be treated as merely a space, as it is in C,
>>? ?  for instance.
>>
>>? ? ? > Python uses indentation for blocks,
>>
>>? ?  and it uses unescaped '\n' (with two escapement options) to
>>? ?  terminate statements. This is fundamental to Python's design and
>>? ?  goes along with significant indents.
>>
>>? ? ? > and by the same mechanism, line breaking can be
>>? ? ? > accommodated without requiring parenthesis or ending backslashes.
>>
>>? ?  You need proof for your claim that indentation can be used for both
>>? ?  jobs in the form of a grammar that works with Python's parser. I am
>>? ?  dubious that you can do that with an indents *after* the newline.
>>
>>? ?  Even if you could, it would be confusing for human readers. There
>>? ?  would then be three ways to escape newline, with one doing double
>>? ?  duty. And for what? Merely to avoid using either of the two methods
>>? ?  already available.
>>
>
>-- 
>http://mail.python.org/mailman/listinfo/python-list
>
>
>
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From alexandru at bastilla.coruscant.org.invalid  Sun Sep  4 06:07:26 2011
From: alexandru at bastilla.coruscant.org.invalid (Alexandru Lazar)
Date: Sun, 4 Sep 2011 10:07:26 +0000 (UTC)
Subject: Need advice on Web / Database framework...
References: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
	<j3ttet$fpn$1@dough.gmane.org>
	<mailman.751.1315095608.27778.python-list@python.org>
Message-ID: <j3viku$c7v$1@dont-email.me>

> How does web2py compare to django? I just started playing with django,
> but don't know web2py

I haven't used Django, but I did use web2py for a project that fell on my
head just before leaving my old workplace. I just wanted it to end quickly
so I took web2py as a shortcut.

It's a great framework -- there seems to be an abstraction layer for
anything, so you can write a fairly pythonic web app with it. The app I
had to write was fairly trivial to be sure, and I barely had to write
any code at all.

What I didn't quite like about it was the documentation, that felt rather
sketchy. There's the Official Web2py Book, but that has more of a tutorial
structure. The API reference feels a tad sketchy and I sometimes had to
guess my way around. But there's a good chance that this is just my bad
impression, as I am not a web developer.

Alex


From steve+comp.lang.python at pearwood.info  Sun Sep  4 07:18:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 04 Sep 2011 21:18:53 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
	<tiobj8-sng.ln1@chris.zbmc.eu>
Message-ID: <4e635e9e$0$29984$c3e8da3$5496439d@news.astraweb.com>

tinnews at isbd.co.uk wrote:

> I think there may be another issue here.  If someone says "functional
> programming" to me then I would generally assume that they *do* mean
> "programming using functions".  

Strictly speaking you are correct, "functional programming" does
mean "programming using functions", the usual name for which is "procedural
programming". But it means more than that: functions in the sense of
mathematical functions, not merely sub-routines.

http://en.wikipedia.org/wiki/Functional_programming

Merely using functions is not the same as functional programming.

> While your distinction of the two may 
> be strictly correct I don't think it's the generally accepted meaning.

On the contrary, "functional programming" specifically refers to languages
derived from, based on, or at least inspired by, the ideas of Alonzo
Church's lambda calculus. It should be understood as somewhat in opposition
to the idea of imperative programming, where the programmer gives
instructions for changing program state.

http://en.wikipedia.org/wiki/Programming_paradigm

In practice, there are degrees of purity: strictly speaking, a purely
functional language would be impractical, because it would have no I/O and
therefore not be very useful. But generally, functional programming
implies:

- all coding is done using functions
- functions are first-class data values
- higher-order functions are used (functions which take functions as
arguments)
- no global variables
- all data is immutable (cannot be modified)
- functions should always return the same result each time they are called
with the same arguments (so-called "referential transparency")
- computations should be performed lazily as needed
- no side-effects other than those caused by hardware limitations (e.g.
there is only a finite amount of memory available), usually with an
exemption made for I/O
- use of recursion instead of imperative features such as iteration (for
loops, while loops, etc.)


Pure functional programming languages enforce those conventions as design
features, rather than just leaving it up to the coder to apply them as a
convention. Impure functional languages, such as Python, don't enforce all
(or even any) of those conditions, although they may provide certain
functional features.



-- 
Steven



From rustompmody at gmail.com  Sun Sep  4 09:13:58 2011
From: rustompmody at gmail.com (rusi)
Date: Sun, 4 Sep 2011 06:13:58 -0700 (PDT)
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>

On Sep 3, 9:15?pm, William Gill <nore... at domain.invalid> wrote:
> During some recent research, and re-familiarization with Python, I came
> across documentation that suggests that programming using functions, and
> programming using objects were somehow opposing techniques.

Staying with (for the moment) the suggestion that OO-P and F-P are
complementary, I believe it is worthwhile to distinguish syntactic OO-
P vs F-P from semantic OO-P vs F-P.

Syntactically: f(x) is functional x.f() is object oriented.
Semantically if f's return value depends only on x ie does not depend
on state it is functional (in the math sense) -- the jargon is that f
is referentially transparent.

Referential opaqueness is usually such a source of problems that it
turns out good to contain the problem somewhat -- hence the wish for
encapsulation.

One can find in the python library itself all 4 combinations:
syntactically and semantically OO : sort
syntactically and semantically FP: sorted
syntactically OO semantically FP: join


From erik.williamson at gmail.com  Sun Sep  4 10:22:07 2011
From: erik.williamson at gmail.com (Erik)
Date: Sun, 4 Sep 2011 07:22:07 -0700 (PDT)
Subject: Can't use subprocess.Popen() after os.chroot() - why?
Message-ID: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>

Hi All,

I'm trying to do the following: 

import os
from subprocess import Popen, PIPE

os.chroot("/tmp/my_chroot")
p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
stdout_val, stderr_val = p.communicate()
print stdout_val

but the Popen call is dying with the following exception:

Traceback (most recent call last):
  File "./test.py", line 7, in <module>
    p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
  File "/home/erik/lib/python2.7/subprocess.py", line 679, in __init__
  File "/home/erik/lib/python2.7/subprocess.py", line 1224, in _execute_child
  File "/home/erik/lib/python2.7/pickle.py", line 1382, in loads
  File "/home/erik/lib/python2.7/pickle.py", line 858, in load
  File "/home/erik/lib/python2.7/pickle.py", line 971, in load_string
LookupError: unknown encoding: string-escape

Am I missing something here? does the chroot environment need to be populated with more than just the date executable in this case? I can't seem to find any examples of this & would appreciate any insight.  

Thanks,
Erik.


From ron3200 at gmail.com  Sun Sep  4 11:22:32 2011
From: ron3200 at gmail.com (ron3200)
Date: Sun, 04 Sep 2011 10:22:32 -0500
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
	<87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315149752.24283.18.camel@Gutsy>

On Sat, 2011-09-03 at 13:38 +0900, Stephen J. Turnbull wrote:
> Guido van Rossum writes:
>  > On Fri, Sep 2, 2011 at 12:28 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:
> 
>  > > Sure, but IIRC one design principle of Python is that the keyword that
>  > > denotes the syntax should be the first thing on the line,
> [...]
>  > That's true for *statements* (except assignments and calls).
>  > 
>  > > Analogously, if operators are going to denote continuation, they
>  > > should come first on the line.
> 
>  > That doesn't follow.
> 
> Agreed, it's not a logical implication.  The analogy is only an
> analogy, but my eyes do work that way.
> 
> My conclusion is that we shouldn't try to encourage either style,
> because people "see" continuation differently.  Legislating a style
> isn't going to change that, I think.

I like to start continued lines with an operator as well.   I also think
it helps me keep it in my head a bit easier when I do that. 

I think this is one of those areas where computers and people differ,
but it may also depend on the persons native language as to what works
better for them.

Ron





From alain at dpt-info.u-strasbg.fr  Sun Sep  4 11:25:48 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sun, 04 Sep 2011 17:25:48 +0200
Subject: Can't use subprocess.Popen() after os.chroot() - why?
References: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>
Message-ID: <87zkikz5vn.fsf@dpt-info.u-strasbg.fr>

Erik <erik.williamson at gmail.com> writes:

> import os
> from subprocess import Popen, PIPE
>
> os.chroot("/tmp/my_chroot")
> p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
> stdout_val, stderr_val = p.communicate()
> print stdout_val
>
> but the Popen call is dying with the following exception:
>
> Traceback (most recent call last):
>   File "./test.py", line 7, in <module>
>     p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
>   File "/home/erik/lib/python2.7/subprocess.py", line 679, in __init__
>   File "/home/erik/lib/python2.7/subprocess.py", line 1224, in _execute_child
>   File "/home/erik/lib/python2.7/pickle.py", line 1382, in loads
>   File "/home/erik/lib/python2.7/pickle.py", line 858, in load
>   File "/home/erik/lib/python2.7/pickle.py", line 971, in load_string
> LookupError: unknown encoding: string-escape
>
> Am I missing something here? does the chroot environment need to be
> populated with more than just the date executable in this case?

Yes, because /bin/date is probably dynamically linked: you need the libs
as well. (Try first with a statically linked executable, e.g.,
/bin/busybox, and everything should be ok).

I agree the message is strange. For some reason, subprocess is calling
pickle.loads, which calls rep.decode("string-escape"), which probably
needs to access some file and fails because of the chroot().

I woud advise to use the chroot command instead of chrooting your python
process, if that's possible for you.

-- Alain.


From rantingrick at gmail.com  Sun Sep  4 12:37:00 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 09:37:00 -0700 (PDT)
Subject: allow line break at operators
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
	<mailman.737.1315068637.27778.python-list@python.org>
Message-ID: <b7d647f1-901b-4ab9-8fe1-eab1a3dae140@u6g2000yqa.googlegroups.com>

On Sep 3, 11:50?am, Stephen Hansen <me+list/pyt... at ixokai.io> wrote:

> Freedom is not and never has been, IMHO, a virtue or goal or even desire
> in Python.

Exactly!

> Where it occurs, it is at best a happy coincidence,

Exactly!

> and even
> if that happy coincidence happens often, it is not a design feature, IMHO.

Exactly! Actually i believe Python allows TOO many freedoms and
indulges TOO many excesses to the detriment of our code bases. Take
the fact that both tabs AND spaces are legal in Python source. We
should have choose one over the other!



From hansmu at xs4all.nl  Sun Sep  4 13:36:28 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Sun, 04 Sep 2011 19:36:28 +0200
Subject: Can't use subprocess.Popen() after os.chroot() - why?
In-Reply-To: <87zkikz5vn.fsf@dpt-info.u-strasbg.fr>
References: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>
	<87zkikz5vn.fsf@dpt-info.u-strasbg.fr>
Message-ID: <4e63b71c$0$2421$e4fe514c@news2.news.xs4all.nl>

On 4/09/11 17:25:48, Alain Ketterlin wrote:
> Erik<erik.williamson at gmail.com>  writes:
>
>> import os
>> from subprocess import Popen, PIPE
>>
>> os.chroot("/tmp/my_chroot")
>> p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
>> stdout_val, stderr_val = p.communicate()
>> print stdout_val
>>
>> but the Popen call is dying with the following exception:
>>
>> Traceback (most recent call last):
>>    File "./test.py", line 7, in<module>
>>      p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
>>    File "/home/erik/lib/python2.7/subprocess.py", line 679, in __init__
>>    File "/home/erik/lib/python2.7/subprocess.py", line 1224, in _execute_child
>>    File "/home/erik/lib/python2.7/pickle.py", line 1382, in loads
>>    File "/home/erik/lib/python2.7/pickle.py", line 858, in load
>>    File "/home/erik/lib/python2.7/pickle.py", line 971, in load_string
>> LookupError: unknown encoding: string-escape
>>
>> Am I missing something here? does the chroot environment need to be
>> populated with more than just the date executable in this case?
>
> Yes, because /bin/date is probably dynamically linked: you need the libs
> as well. (Try first with a statically linked executable, e.g.,
> /bin/busybox, and everything should be ok).

/bin/date also needs timezone information from either /etc/localtime
or /usr/share/zoneinfo/ (depends on whether the environment variable
TZ is set).

It may need other data files as well (e.g. for localization).

> I agree the message is strange. For some reason, subprocess is calling
> pickle.loads, which calls rep.decode("string-escape"), which probably
> needs to access some file and fails because of the chroot().

The child process tries to exec /bin/date and fails.  The child process
then pickles the resulting exception and sends it to the parent via
a pipe that the parent has created for this purpose.  The parent then
tries to unpickle the exception and fails to find the string-escape
decoder in its usual place, due to the chroot.

If you fix that, then the parent process will be able to re-raise the
exception from the child process (which may or may not confuse you).

> I woud advise to use the chroot command instead of chrooting your python
> process, if that's possible for you.

You'll find you need to copy a lot of dynamic libraries and several
data files to your chroot box, before the normal commands in /bin work.

Keep in mind that the more features you copy to the chroot jail, the
easier it becomes to escape from it.

Hope this helps,

-- HansM


From rantingrick at gmail.com  Sun Sep  4 14:08:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 11:08:36 -0700 (PDT)
Subject: allow line break at operators
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
	<87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>
	<mailman.760.1315156946.27778.python-list@python.org>
Message-ID: <af2323a6-f3cc-4a71-a704-466e40c44b8f@l7g2000vbz.googlegroups.com>

On Sep 4, 10:22?am, ron3200 <ron3... at gmail.com> wrote:

> I think this is one of those areas where computers and people differ,
> but it may also depend on the persons native language as to what works
> better for them.

Yes but what works better for "them" is not always a better way of
doing things! People do foolish things all the time just from pure
habit. A foolish consistency is a foolish consistency my friend. I
mean, look at the folks who popped their cherry writing Basic code;
talk about dysfunctional!


From tjreedy at udel.edu  Sun Sep  4 14:32:07 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 04 Sep 2011 14:32:07 -0400
Subject: Functions vs OOP
In-Reply-To: <tiobj8-sng.ln1@chris.zbmc.eu>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
	<tiobj8-sng.ln1@chris.zbmc.eu>
Message-ID: <j40g8p$33o$1@dough.gmane.org>

On 9/4/2011 4:13 AM, tinnews at isbd.co.uk wrote:
> Ian Kelly<ian.g.kelly at gmail.com>  wrote:

>> Functional programming is about using functions in the *mathematical*
>> sense.  A mathematical function maps one value (or tuple of values) to
>> another value.  The mapped value never varies; if it did, it would be
>> a different function.  So functional programming eschews the use of
>> functions where the results depend on any internal or external state
>> beyond the values of the passed-in arguments, such as the variable
>> state of the object the method is being called on.
>>
> I think there may be another issue here.  If someone says "functional
> programming" to me then I would generally assume that they *do* mean
> "programming using functions".  While your distinction of the two may
> be strictly correct I don't think it's the generally accepted meaning.

The distintion drawn by Ian *is* generally accepted in computer science. See
https://secure.wikimedia.org/wikipedia/en/wiki/Functional_programming
For instance, programming is C is imperative programming with functions 
but it generally is not 'functional programming' in the sense referred 
to by Ian and the Wikipedia article. Given that our docs are written by 
people who do understand the technical distinction, you are probably 
wrong to assume otherwise.

However, as I said to William, it is possible that our docs could be 
improved so as to not depend on all readers having prior knowledge of 
the intended meaning of 'functional programming'. As the use of Python 
has expanded, so has the variety of backgrounds of Python programmers.

-- 
Terry Jan Reedy



From PointedEars at web.de  Sun Sep  4 14:35:02 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Sun, 04 Sep 2011 20:35:02 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
	<6545843.yvFAXZvWTv@PointedEars.de>
	<9c528rFi5aU1@mid.individual.net>
	<4761603.ypaU67uLZW@PointedEars.de>
	<9c6d4cFa54U1@mid.individual.net>
	<109595831.VCN276Cjj6@PointedEars.de>
	<9cgsvvFdhuU1@mid.individual.net>
Message-ID: <1536106.qVoOGUtdWV@PointedEars.de>

Fokke Nauta wrote:

> "Thomas 'PointedEars' Lahn" <PointedEars at web.de> wrote in message
> news:109595831.VCN276Cjj6 at PointedEars.de...
> 
> <cut>
> 
> If you don't have anything better to contribute, please stop answering.
> 
> Es gen?gt schon.

I should have expected as much from an address munger.

*plonk*

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From bkasterm at gmail.com  Sun Sep  4 15:39:49 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Sun, 04 Sep 2011 13:39:49 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
Message-ID: <87obz0w0ze.fsf@gmail.com>

rantingrick <rantingrick at gmail.com> writes:

> On Sep 3, 5:15?pm, Bart Kastermans <bkast... at gmail.com> wrote:
>
>> Any suggestions?
>
> Yeah, have you considered using the "linespace()" method of tk.Font
> objects to calculate the height? Although i must say it "feels" as if
> your doing something you should not need to do, however i cannot be
> sure without knowing more about this GUI. Sounds a lot like trying to
> put socks on a rooster.
>
> http://infohost.nmt.edu/tcc/help/pubs/tkinter/std-attrs.html#fonts

Thx.  That function should allow for a bit of robustness.

I get bits of information over RSS, these are of varying length.  I
want to show 10 at a time, and scroll through them.  Now when I
scroll the window grows and shrinks depending on their size, I want
to right from the start make it high enough to contain even the
biggest that will have to be shown.  So the question is determining
the height parameter for the labels ahead of time.  My strategy has
been to put all in labels and then try to get the information from
the label of how high it needs to be made at a certain width.


From nospam at domain.invalid  Sun Sep  4 15:43:31 2011
From: nospam at domain.invalid (William Gill)
Date: Sun, 04 Sep 2011 15:43:31 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.761.1315161191.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>	<mailman.743.1315075846.27778.python-list@python.org>	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
Message-ID: <j40kd8$du4$1@dont-email.me>

On 9/4/2011 2:32 PM, Terry Reedy wrote:
> On 9/4/2011 4:13 AM, tinnews at isbd.co.uk wrote:
>> Ian Kelly<ian.g.kelly at gmail.com> wrote:
>
>>> Functional programming is about using functions in the *mathematical*
>>> sense. A mathematical function maps one value (or tuple of values) to
>>> another value. The mapped value never varies; if it did, it would be
>>> a different function. So functional programming eschews the use of
>>> functions where the results depend on any internal or external state
>>> beyond the values of the passed-in arguments, such as the variable
>>> state of the object the method is being called on.
>>>
>> I think there may be another issue here. If someone says "functional
>> programming" to me then I would generally assume that they *do* mean
>> "programming using functions". While your distinction of the two may
>> be strictly correct I don't think it's the generally accepted meaning.
>
> The distintion drawn by Ian *is* generally accepted in computer science.
> See
> https://secure.wikimedia.org/wikipedia/en/wiki/Functional_programming
> For instance, programming is C is imperative programming with functions
> but it generally is not 'functional programming' in the sense referred
> to by Ian and the Wikipedia article. Given that our docs are written by
> people who do understand the technical distinction, you are probably
> wrong to assume otherwise.
>
> However, as I said to William, it is possible that our docs could be
> improved so as to not depend on all readers having prior knowledge of
> the intended meaning of 'functional programming'. As the use of Python
> has expanded, so has the variety of backgrounds of Python programmers.
>
Since I am the one who opened this can of worms, and since I believe I 
have relocated the document that I misinterpreted,  I feel compelled to 
jump in here.

The source of my error is "Functional Programming HOWTO 
(/python-3.1.3-docs-html/howto/functional.html)"

Having arrived at this page indirectly (searching for and skimming other 
information regarding functions and methods) I was only half paying 
attention.  As a result I made the same mistake Chris did.

As a point of reference, I would not call myself a programmer, and any 
formal exposure was many, many years ago.  I am familiar with the 
concepts of procedural, declarative, and object-oriented programming, 
but not functional.  At least not in this context.

Having done a little more digging I now understand the difference. 
"Functional programming" is the proper terminology, and had I come 
across it from another direction, or with a more deliberate focus I 
probably wouldn't have made the initial mistake.

If you read the material with even a nominal understanding of the 
functional paradigm (functional relationships in a mathematical sense, 
not functions in the procedural sense), it is clear.  If you read it 
without consciously recognizing this difference, the material does 
nothing to alert you to the initial error.






From georg at python.org  Sun Sep  4 16:21:50 2011
From: georg at python.org (Georg Brandl)
Date: Sun, 04 Sep 2011 22:21:50 +0200
Subject: [RELEASED] Python 3.2.2
Message-ID: <4E63DDDE.2040108@python.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On behalf of the Python development team, I'm happy to announce the
Python 3.2.2 maintenance release.

Python 3.2.2 mainly fixes `a regression <http://bugs.python.org/12576>`_ in the
``urllib.request`` module that prevented opening many HTTP resources correctly
with Python 3.2.1.

Python 3.2 is a continuation of the efforts to improve and stabilize the
Python 3.x line.  Since the final release of Python 2.7, the 2.x line
will only receive bugfixes, and new features are developed for 3.x only.

Since PEP 3003, the Moratorium on Language Changes, is in effect, there
are no changes in Python's syntax and built-in types in Python 3.2.
Development efforts concentrated on the standard library and support for
porting code to Python 3.  Highlights are:

* numerous improvements to the unittest module
* PEP 3147, support for .pyc repository directories
* PEP 3149, support for version tagged dynamic libraries
* PEP 3148, a new futures library for concurrent programming
* PEP 384, a stable ABI for extension modules
* PEP 391, dictionary-based logging configuration
* an overhauled GIL implementation that reduces contention
* an extended email package that handles bytes messages
* a much improved ssl module with support for SSL contexts and certificate
  hostname matching
* a sysconfig module to access configuration information
* additions to the shutil module, among them archive file support
* many enhancements to configparser, among them mapping protocol support
* improvements to pdb, the Python debugger
* countless fixes regarding bytes/string issues; among them full support
  for a bytes environment (filenames, environment variables)
* many consistency and behavior fixes for numeric operations

For a more extensive list of changes in 3.2, see

    http://docs.python.org/3.2/whatsnew/3.2.html

To download Python 3.2 visit:

    http://www.python.org/download/releases/3.2/

Please consider trying Python 3.2 with your code and reporting any bugs
you may notice to:

    http://bugs.python.org/


Enjoy!

- --
Georg Brandl, Release Manager
georg at python.org
(on behalf of the entire python-dev team and 3.2's contributors)
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.18 (GNU/Linux)

iEYEARECAAYFAk5j3d4ACgkQN9GcIYhpnLA2BACeLZ8nSdVOoxlJw4DnbM42neeA
fwAAoKTHetXsVxrEfvCWSorUhoJ083kZ
=5Wm1
-----END PGP SIGNATURE-----


From rantingrick at gmail.com  Sun Sep  4 17:10:59 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 14:10:59 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
Message-ID: <8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>

On Sep 4, 2:39?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> I get bits of information over RSS, these are of varying length. ?I
> want to show 10 at a time, and scroll through them. ?Now when I
> scroll the window grows and shrinks depending on their size, I want
> to right from the start make it high enough to contain even the
> biggest that will have to be shown. ?So the question is determining
> the height parameter for the labels ahead of time. ?My strategy has
> been to put all in labels and then try to get the information from
> the label of how high it needs to be made at a certain width.

I see. However i might opt instead for a text widget with columns of
wrapped text. You could use the textwrap.py module to help (although
you'll have to work around it's shortcomings for paragraphs and such).
In any event it's difficult to offer good advice without seeing the
code directly.




From rantingrick at gmail.com  Sun Sep  4 17:15:07 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 14:15:07 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
Message-ID: <d9f70fa4-da45-445c-b976-824c92ea8de0@s12g2000yqm.googlegroups.com>

On Sep 4, 2:39?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> Thx. ?That function should allow for a bit of robustness.

Correction. The function is actually "tkFont.metrics(arg)" which takes
"linespace" as an optional argument.


From exarkun at twistedmatrix.com  Sun Sep  4 17:26:01 2011
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sun, 04 Sep 2011 21:26:01 -0000
Subject: pyOpenSSL 0.13 release
Message-ID: <20110904212601.1808.1179874796.divmod.xquotient.244@localhost.localdomain>

Hello all,

I'm happy to announce the release of pyOpenSSL 0.13.  With this release, 
pyOpenSSL now supports OpenSSL 1.0.  Additionally, pyOpenSSL now works 
with PyPy.

Apart from those two major developments, the following interesting 
changes have been made since the last release:

  * (S)erver (N)ame (I)ndication is now supported.
  * There are now APIs with which the underlying OpenSSL version can be 
queried.
  * The peer's certificate chain for a connection can now be inspected.
  * New methods have been added to PKey and X509 objects exposing more 
OpenSSL functionality.

Release files are available on PyPI.  The latest development version and 
the issue tracker can be found on Launchpad.

Jean-Paul


From steve+comp.lang.python at pearwood.info  Sun Sep  4 19:41:42 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 05 Sep 2011 09:41:42 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>	<mailman.743.1315075846.27778.python-list@python.org>	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
	<j40kd8$du4$1@dont-email.me>
Message-ID: <4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>

William Gill wrote:

> The source of my error is "Functional Programming HOWTO
> (/python-3.1.3-docs-html/howto/functional.html)"

For those who don't have access to William's local file system, I expect
he's looking at this:

http://docs.python.org/release/3.1.3/howto/functional.html

or the most recent version:

http://docs.python.org/dev/howto/functional.html


[...]
> If you read the material with even a nominal understanding of the
> functional paradigm (functional relationships in a mathematical sense,
> not functions in the procedural sense), it is clear.  If you read it
> without consciously recognizing this difference, the material does
> nothing to alert you to the initial error.

What about the entire "Introduction" section, which starts with this
statement?

"This section explains the basic concept of functional programming"

If you would like to suggest improvements, please do so.




-- 
Steven



From nospam at domain.invalid  Sun Sep  4 20:46:19 2011
From: nospam at domain.invalid (William Gill)
Date: Sun, 04 Sep 2011 20:46:19 -0400
Subject: Functions vs OOP
In-Reply-To: <4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>	<mailman.743.1315075846.27778.python-list@python.org>	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
	<j40kd8$du4$1@dont-email.me>
	<4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j41651$bck$1@dont-email.me>

On 9/4/2011 7:41 PM, Steven D'Aprano wrote:
> William Gill wrote:
>
>> The source of my error is "Functional Programming HOWTO
>> (/python-3.1.3-docs-html/howto/functional.html)"
>
> For those who don't have access to William's local file system, I expect
> he's looking at this:
>
> http://docs.python.org/release/3.1.3/howto/functional.html
>
> or the most recent version:
>
> http://docs.python.org/dev/howto/functional.html

I didn't expect anyone to access my file system so I trimmed the path, 
but left enough for an industrious soul like yourself to figure it out. 
  You did, so it seems I was correct, or do you think "functional.html" 
would have been sufficient? ;-)

>
> [...]
>> If you read the material with even a nominal understanding of the
>> functional paradigm (functional relationships in a mathematical sense,
>> not functions in the procedural sense), it is clear.  If you read it
>> without consciously recognizing this difference, the material does
>> nothing to alert you to the initial error.
>
> What about the entire "Introduction" section, which starts with this
> statement?
>
> "This section explains the basic concept of functional programming"

Which clears up the misunderstanding, how?  Unless the target audience 
is people who already understands "the basic concept of functional 
programming."  That seems like a circular reference.

The article is introducing a concept.  To assume any familiarity with 
that concept as a basis, is not an introduction.

As previously stated; I was already familiar with the concepts of 
procedural, declarative, and object-oriented programming, but not 
functional programming.  Nothing I read (I'll be honest; scanned) did 
anything to contradict my incorrect point of reference.

> If you would like to suggest improvements, please do so.

How about a caveat stating something like "NOTE: functional as in 
mathematical functions, not to be confused with functions/procedures."




From rosuav at gmail.com  Sun Sep  4 20:59:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 5 Sep 2011 10:59:59 +1000
Subject: Functions vs OOP
In-Reply-To: <4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
	<j40kd8$du4$1@dont-email.me>
	<4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmq7y6J-F82HuwXDy-eZwK20Pz7aQqSMO50m8K6K_=wu-A@mail.gmail.com>

On Mon, Sep 5, 2011 at 9:41 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> http://docs.python.org/dev/howto/functional.html
>
> What about the entire "Introduction" section, which starts with this
> statement?
>
> "This section explains the basic concept of functional programming"
>
> If you would like to suggest improvements, please do so.

Well, it does invite you to skip that whole section :)

Since you asked, though, the copyeditor in me does want to suggest one
small tweak:

Second paragraph after the bullet list ends "Avoiding side effects
means not using data structures that get updated as a program runs;
every function?s output must only depend on its input." - I'd word it
as "must depend only on". Pretty immaterial, but the formal style
prefers correctness.

Somewhat more significant: Under "Modularity", may be of value to add
a paragraph about parallelism.

With functional code, it's easy for an interpreter to ascertain which
functions depend on each other (because one's return value is
another's input). Independent functions can be run in parallel without
affecting the result; the interpreter can therefore divide a complex
task across multiple CPUs without any work from the programmer.

Like I said, it's just "since you asked". :) The above paragraph is
hereby given out as public domain, use it (edit it, whatever) under
whatever license the Python docs require.

ChrisA


From simoncropper at fossworkflowguides.com  Mon Sep  5 01:18:30 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 15:18:30 +1000
Subject: Hello, and request for help with 'dynamic grids'
Message-ID: <4E645BA6.4070500@fossworkflowguides.com>

Hi,

I am a applications developer - originally from Windows using primarily 
Visual Foxpro, although I am familiar with a variety of other xbase 
derivatives. I now use Linux / Ubuntu, and have been actively teaching 
myself Python with the view to migrate most of my applications to 
sqlite-based database.

I am looking for the ability to create dynamic grids in a window but 
can't for the life of me find how to do this.

Here is the functionality that I desire...
1. Have a dialog appear that allows me to select a database, e.g. 
sqlite3 database.
2. Select table in the database and have all the records appear in a 
grid. Fields represented as column, width and order adjustable, rows 
representing records. Each cell can be edited directly.
3. I would like to create filters on this grid based on attributes in 
the table. So if the table is a list of names, filter and show only 
those people with a particular first name. For people familiar with 
xbase languages it equivalent to browsing a table and applying a filter.
4. Once the record is identified I would like to select the record or 
hit enter to have the data sent to the keyboard buffer or put into the 
clipboard.

I have found most of these elements available. I can create dialogs, I 
can connect to a database, I can extract data from the tables using SQL 
but I can't find how to easily get these lists into a grid -- it appears 
to me you need to allocate list record 1 to grid row 1, list record 2 to 
grid row 2, etc and manage how many rows are displayed and 'page' 
through the table.

Am I missing something? I presume that you could just supply a list or 
array selected using SQL from a table and just pass this data to a grid 
and have it manage all the basics like if the window is resized the 
number of rows and columns are adjusted accordingly, buffering records, etc.

My investigations have generally found that windows/forms/data entry 
screen can be created for a specific table or view, but these are 
hard-wired during development. Is there anyway of rapidly defining the 
grid during runtime so any table can be viewed?

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From krille012 at gmail.com  Mon Sep  5 02:47:42 2011
From: krille012 at gmail.com (=?ISO-8859-1?Q?Kristofer_Tengstr=F6m?=)
Date: Sun, 4 Sep 2011 23:47:42 -0700 (PDT)
Subject: Need help with simple OOP Python question
Message-ID: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>

Hi, I'm having trouble creating objects that in turn can have custom
objects as variables. The code looks like this:

---------------------------------------------

class A:
    sub = dict()
    def sub_add(self, cls):
        obj = cls()
        self.sub[obj.id] = obj

class B(A):
    id = 'inst'

base = A()
base.sub_add(B)
base.sub['inst'].sub_add(B)

print # prints a blank line
print base.sub['inst']
print base.sub['inst'].sub['inst']

----------------------------------------------

Now, what I get from this is the following:
<__main__.B instance at 0x01FC20A8>
<__main__.B instance at 0x01FC20A8>
Why is this? What I want is for them to be two separate objects, but
it seems like they are the same one. I've tried very hard to get this
to work, but as I've been unsuccessful I would really appreciate some
comments on this. I'm sure it's something really easy that I just
haven't thought of.

Python version is 2.6.5 (I'm using Panda3D to create a 2?D game).


From me+list/python at ixokai.io  Mon Sep  5 03:07:45 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Mon, 05 Sep 2011 00:07:45 -0700
Subject: Need help with simple OOP Python question
In-Reply-To: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <4E647541.7080304@ixokai.io>

On 9/4/11 11:47 PM, Kristofer Tengstr?m wrote:
> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables. The code looks like this:
> 
> ---------------------------------------------
> 
> class A:
>     sub = dict()

You are sharing this single "sub" dictionary with all instances of your
A class.

If you want to define instance-specific attributes, define them in the
__init__ method, like so:

class A:
    def __init__(self):
        self.sub = dict()

    def sub_add(self, cls):
        obj = cls()
        self.sub[obj.id] = obj

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

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From __peter__ at web.de  Mon Sep  5 03:10:14 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 05 Sep 2011 09:10:14 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <j41skh$mv7$1@dough.gmane.org>

Kristofer Tengstr?m wrote:

> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables. The code looks like this:
> 
> ---------------------------------------------
> 
> class A:
>     sub = dict()

Putting it into the class like this means sub is shared by all instances.

>     def sub_add(self, cls):
>         obj = cls()
>         self.sub[obj.id] = obj
> 
> class B(A):
>     id = 'inst'
> 
> base = A()
> base.sub_add(B)
> base.sub['inst'].sub_add(B)
> 
> print # prints a blank line
> print base.sub['inst']
> print base.sub['inst'].sub['inst']
> 
> ----------------------------------------------
> 
> Now, what I get from this is the following:
> <__main__.B instance at 0x01FC20A8>
> <__main__.B instance at 0x01FC20A8>
> Why is this? What I want is for them to be two separate objects, but
> it seems like they are the same one. I've tried very hard to get this
> to work, but as I've been unsuccessful I would really appreciate some
> comments on this. I'm sure it's something really easy that I just
> haven't thought of.

Your class A needs an initialiser:

class A:
    def __init__(self):
        self.sub = {} # one dict per instance
    # ...



From steve+comp.lang.python at pearwood.info  Mon Sep  5 03:19:12 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 05 Sep 2011 17:19:12 +1000
Subject: Hello, and request for help with 'dynamic grids'
References: <mailman.765.1315202654.27778.python-list@python.org>
Message-ID: <4e6477f0$0$29981$c3e8da3$5496439d@news.astraweb.com>

On Mon, 5 Sep 2011 03:18 pm Simon Cropper wrote:

> I am looking for the ability to create dynamic grids in a window but
> can't for the life of me find how to do this.

What GUI toolkit are you using?


-- 
Steven



From ben+python at benfinney.id.au  Mon Sep  5 03:26:51 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 05 Sep 2011 17:26:51 +1000
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <87sjobo3es.fsf@benfinney.id.au>

Kristofer Tengstr?m <krille012 at gmail.com> writes:

> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables.

That terminology is rather confused.

I think what you want is to have instances with their own attributes.

> class A:
>     sub = dict()

This binds a single object (a new empty dict) to the class attribute
?sub?. Every instance of class ?A? will share the same attribute, and
hence that same dict.

>     def sub_add(self, cls):

This defines a function which will be bound to the class attribute
?sub_add?. It will, when later called as a method, receive the instance
as the first parameter, bound to the local name ?self?.

>         obj = cls()
>         self.sub[obj.id] = obj

Here, ?self? will be an instance of the ?A? class. Each instance has no
?sub? attribute, so Python will find the class attribute ?A.sub?, shared
by all ?A? instances. You're then modifying that class attribute ?A.sub?.

[?]

> Now, what I get from this is the following:
> <__main__.B instance at 0x01FC20A8>
> <__main__.B instance at 0x01FC20A8>
> Why is this?

I hope the above explains it.

> What I want is for them to be two separate objects, but it seems like
> they are the same one.

Yes. Anything you talk about in the class definition scope cannot know
about any instance of that class, since the instances don't exist yet.

Instead, instance attributes need to be bound to a particular instance,
which means you need to have a reference to the instance; that's what
?self? is for. The class initialiser is a method named ?__init__?, and
is called on each newly-created instance before that instance is
returned from the constructor.

I advise you to work through the Python tutorial, beginning to end,
which will give you a good grounding in these and other fundamental
Python topics <URL:http://docs.python.org/tutorial/>. Work through each
example, understand it by experimenting, and then proceed to the next,
until you've done the lot.

-- 
 \         ?If history and science have taught us anything, it is that |
  `\     passion and desire are not the same as truth.? ?E. O. Wilson, |
_o__)                                              _Consilience_, 1998 |
Ben Finney


From bex.lewis at gmail.com  Mon Sep  5 05:01:05 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Mon, 5 Sep 2011 02:01:05 -0700 (PDT)
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
Message-ID: <a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>

>
> > Possibly.
> > I tried this:
> > server.py -n -c config.ini
> > Once again, the server is up and running and when I am logging in with my
> > browser (10.0.0.140:8081) I can see information showing up at the command
> > prompt, showing somebody is logging is, but the same error:
> > "fshandler:get_data: \Webdav not found". During starting up the server
> > mentioned: "pywebdav:Serving data from \Webdav".
>
> > In the config file it says:
> > "# main directory
> > directory = \Webdav"
>
> > Perhaps my Python configuration is at fault.
>
> > Fokke
>
> Is the path supposed to be absolute? In which case you'd need to have:
> directory=C:\path\to\Webdav
>
> instead of just
> directory=\Webdav
>
> I tried:
> directory=D:\Webdav
> directory=D:/Webdav
>
> To no avail.
> It didn.t make any difference.
>
> I surely believe my WebDAV installation is at fault.
>
> Fokke

Interestingly, looking at the code that returns the
"fshandler:get_data: \Webdav not found" message, it looks like it
tests that the path given exists and then tries an os.path.isfile,
then an os.path.isdir. If both fail you get the message that you see.
This might be a bit of a shot in the dark but could you try the path
with and without a trailing '/' or '\'? I don't currently have a
windows box available to test on and figure out why it would be
detected as existing but not test true for either a file or directory.

Becky Lewis


From hnsri49 at gmail.com  Mon Sep  5 05:34:22 2011
From: hnsri49 at gmail.com (srinivas hn)
Date: Mon, 5 Sep 2011 15:04:22 +0530
Subject: Need help with simple OOP Python question
In-Reply-To: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <CAG5_3td1a_CB9p0EUXZLM8_ZZ3ie57aHvH1Kjn3apKvB2t0ouw@mail.gmail.com>

Hi,
You are getting same object because you are overriding the dictionary
update.
Its printing the proper value with the last updated instance of B.

If you want to see the two different instances of class B give print
self.sub inside the sub_add method in class A.

CHEERS
CNA
9986229891


On Mon, Sep 5, 2011 at 12:17 PM, Kristofer Tengstr?m <krille012 at gmail.com>wrote:

> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables. The code looks like this:
>
> ---------------------------------------------
>
> class A:
>    sub = dict()
>    def sub_add(self, cls):
>        obj = cls()
>        self.sub[obj.id] = obj
>
> class B(A):
>    id = 'inst'
>
> base = A()
> base.sub_add(B)
> base.sub['inst'].sub_add(B)
>
> print # prints a blank line
> print base.sub['inst']
> print base.sub['inst'].sub['inst']
>
> ----------------------------------------------
>
> Now, what I get from this is the following:
> <__main__.B instance at 0x01FC20A8>
> <__main__.B instance at 0x01FC20A8>
> Why is this? What I want is for them to be two separate objects, but
> it seems like they are the same one. I've tried very hard to get this
> to work, but as I've been unsuccessful I would really appreciate some
> comments on this. I'm sure it's something really easy that I just
> haven't thought of.
>
> Python version is 2.6.5 (I'm using Panda3D to create a 2?D game).
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From simoncropper at fossworkflowguides.com  Mon Sep  5 06:07:05 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 20:07:05 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4e6477f0$0$29981$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.765.1315202654.27778.python-list@python.org>
	<4e6477f0$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E649F49.5050103@fossworkflowguides.com>

On 05/09/11 17:19, Steven D'Aprano wrote:
> On Mon, 5 Sep 2011 03:18 pm Simon Cropper wrote:
>
>> I am looking for the ability to create dynamic grids in a window but
>> can't for the life of me find how to do this.
>
> What GUI toolkit are you using?
>
>

I have looked at wxGlade, Boa Constructor, wxFormBuilder, tkinder, I 
have also looked through the Python website many times looking for 
commands that would allow me to create a GUI from scratch.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From t at jollybox.de  Mon Sep  5 06:40:07 2011
From: t at jollybox.de (Thomas Jollans)
Date: Mon, 05 Sep 2011 12:40:07 +0200
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4E645BA6.4070500@fossworkflowguides.com>
References: <4E645BA6.4070500@fossworkflowguides.com>
Message-ID: <4E64A707.9090006@jollybox.de>

On 05/09/11 07:18, Simon Cropper wrote:
> I am looking for the ability to create dynamic grids in a window but
> can't for the life of me find how to do this.

It depends on which windowing toolkit you're planning to use. If you use
PyGTK, you'd want a TreeView widget to display the list. Fill a
ListStore instance with your data and give that to the TreeView. You can
implement filtering and sorting on top of that using TreeModelFilter and
TreeModelSort.

LibreOffice and OpenOffice have database management components (I
haven't used them, I assume they're somewhat similar to MS Access) - and
they can be scripted using Python. Depending on what you're doing, and
what you're planning to do in the future (re learning investment), that
might be worth looking into.

Thomas


From simoncropper at fossworkflowguides.com  Mon Sep  5 06:52:40 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 20:52:40 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4E64A707.9090006@jollybox.de>
References: <4E645BA6.4070500@fossworkflowguides.com>
	<4E64A707.9090006@jollybox.de>
Message-ID: <4E64A9F8.3000501@fossworkflowguides.com>

On 05/09/11 20:40, Thomas Jollans wrote:
> It depends on which windowing toolkit you're planning to use. If you use
> PyGTK, you'd want a TreeView widget to display the list. Fill a
> ListStore instance with your data and give that to the TreeView. You can
> implement filtering and sorting on top of that using TreeModelFilter and
> TreeModelSort.

I have look at most. I have no preference.

Are you able to point me to some resource material explaining how this 
can be done - e.g. a tutorial or manual?

> LibreOffice and OpenOffice have database management components (I
> haven't used them, I assume they're somewhat similar to MS Access) - and
> they can be scripted using Python. Depending on what you're doing, and
> what you're planning to do in the future (re learning investment), that
> might be worth looking into.

'Base' is of no value in this regard. It is not really designed for this 
and there is a raging debate at the moment whether it will be maintained 
in the future. It also fails in that it requires predefined connections 
and forms to be established. It would not be possible to dynamically 
link to a table in a database (I have established ODBC links to a SQLite 
database, but the driver is an un-maintained draft). I also believe that 
the 'base' component in libreoffice/openoffice is a java implementation 
not python.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From krille012 at gmail.com  Mon Sep  5 09:15:40 2011
From: krille012 at gmail.com (=?ISO-8859-1?Q?Kristofer_Tengstr=F6m?=)
Date: Mon, 5 Sep 2011 06:15:40 -0700 (PDT)
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
Message-ID: <93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>

Thanks everyone, moving the declaration to the class's __init__ method
did the trick. Now there's just one little problem left. I'm trying to
create a list that holds the parents for each instance in the
hierarchy. This is what my code looks like now:

-----------------------------------------

class A:
    def __init__(self, parents=None):
        self.sub = dict()
        if parents:
            self.parents = parents
        else:
            self.parents = []
    def sub_add(self, cls):
        hierarchy = self.parents
        hierarchy.append(self)
        obj = cls(hierarchy)
        self.sub[obj.id] = obj

class B(A):
    id = 'inst'

base = A()
base.sub_add(B)
base.sub['inst'].sub_add(B)

print
print vars(base)
print
print vars(base.sub['inst'])
print
print vars(base.sub['inst'].sub['inst'])

---------------------------------------------

The output from this program is the following:

{'parents': [<__main__.A instance at 0x02179468>, <__main__.B instance
at 0x021794B8>], 'sub': {'inst': <__main__.B instance at 0x021794B8>}}

{'parents': [<__main__.A instance at 0x02179468>, <__main__.B instance
at 0x021794B8>], 'sub': {'inst': <__main__.B instance at 0x021794E0>}}

{'parents': [<__main__.A instance at 0x02179468>, <__main__.B instance
at 0x021794B8>], 'sub': {}}

As you can see, the problem looks similar to the one before: All the
instances have an identical parent list. However, I don't understand
why as self.parents is declared in the __init__ method. Any ideas?
What I want is for the first instance to have an empty list, the
second to have one element in the list and the third to have two
parent elements.


From python at bdurham.com  Mon Sep  5 09:23:51 2011
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 05 Sep 2011 09:23:51 -0400
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4E645BA6.4070500@fossworkflowguides.com>
References: <4E645BA6.4070500@fossworkflowguides.com>
Message-ID: <1315229031.32028.140258137504765@webmail.messagingengine.com>

Hi Simon,

> I am a applications developer - originally from Windows using primarily 
Visual Foxpro, although I am familiar with a variety of other xbase 
derivatives. 

Check out dabodev.com. Dabo is a Python framework created by former VFP
developers.

Highly recommended.

Malcolm


From simoncropper at fossworkflowguides.com  Mon Sep  5 09:33:31 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 23:33:31 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <1315229031.32028.140258137504765@webmail.messagingengine.com>
References: <4E645BA6.4070500@fossworkflowguides.com>
	<1315229031.32028.140258137504765@webmail.messagingengine.com>
Message-ID: <4E64CFAB.70804@fossworkflowguides.com>

On 05/09/11 23:23, python at bdurham.com wrote:
> Check out dabodev.com. Dabo is a Python framework created by former VFP
> developers.
>

Dabo is a great product. Spoke extensively with Ed Leafe and Paul 
McNett. Unfortunately the framework is not 'dynamic'. If you have an 
fixed database and tables it can quite quickly create a basic data entry 
setup and menu. Looks great when it runs. The problem is creating the 
window and grid on the fly.

I want a program that can be used to open any database and 'data mine' 
and extract table content. Dabo allows RAD for an established relational 
databases not unknown ones.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From piet at vanoostrum.org  Mon Sep  5 10:15:01 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Mon, 05 Sep 2011 16:15:01 +0200
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<4e5e5628$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<j3m4pg01enu@news4.newsguy.com>
Message-ID: <m2wrdnf53u.fsf@cochabamba.vanoostrum.org>

Chris Torek <nospam at torek.net> writes:

[snip]
> Instead, we have a syntax where you, the programmer, write out the
> name of the local variable that binds to the first parameter.  This
> means the first parameter is visible.  Except, it is only visible
> at the function definition -- when you have the instance and call
> the instance or class method:
>
>     black_knight = K()
>     black_knight.meth1('a', 1)
>     black_knight.meth2(2)
>
> the first parameters (black_knight, and black_knight.__class__,
> respectively) are magic, and invisible.
>
> Thus, Python is using the "explicit is better than implicit" rule
> in the definition, but not at the call site.  I have no problem with
> this.  Sometimes I think implicit is better than explicit.  In this
> case, there is no need to distinguish, at the calls to meth1() and
> meth2(), as to whether they are "class" or "instance" methods.  At
> the *calls* they would just be distractions.

It *is* explicit also at the call site. It only is written at the left of the dot rather than at the right of the parenthesis. And that is necessary to locate which definition of the method applies. It would be silly to repeat this information after the parenthesis. Not only silly, it would be stupid as it would be a source of errors, and an example of DRY.
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From piet at vanoostrum.org  Mon Sep  5 10:23:24 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Mon, 05 Sep 2011 16:23:24 +0200
Subject: Closures and Partial Function Application
References: <9cd48486-acd9-4888-9677-0e54fd1eedfd@k15g2000yqd.googlegroups.com>
Message-ID: <m2sjobf4pv.fsf@cochabamba.vanoostrum.org>

Travis Parks <jehugaleahsa at gmail.com> writes:

> I also like partial function application. What is the easiest way of
> achieving this in Python? Would it look something like this:
>
> def foo(x, y):
>     return x + y
>
> xFoo = lambda y: foo(10, y)

from functools import partial
xfoo = partial(foo, 10)
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From wuwei23 at gmail.com  Mon Sep  5 10:40:15 2011
From: wuwei23 at gmail.com (alex23)
Date: Mon, 5 Sep 2011 07:40:15 -0700 (PDT)
Subject: Hello, and request for help with 'dynamic grids'
References: <mailman.765.1315202654.27778.python-list@python.org>
Message-ID: <624f5caf-e3c1-4a88-9861-606f7e2705e8@x14g2000prn.googlegroups.com>

On Sep 5, 3:18?pm, Simon Cropper <simoncrop... at fossworkflowguides.com>
wrote:
> My investigations have generally found that windows/forms/data entry
> screen can be created for a specific table or view, but these are
> hard-wired during development. Is there anyway of rapidly defining the
> grid during runtime so any table can be viewed?

The commercial product Resolver One provides a grid/spreadsheet style
interface with Python scripting capabilities. I'm not sure of its
current licensing status but I believe it used to be free if used on
open source projects.

http://www.resolversystems.com/products/resolver-one/

Each spreadsheet itself is Python code; I think it should be quite do-
able to take something with introspective SQL capabilities like
SQLAlchemy and have it title columns and fill them with the correct
fields accordingly.

Hope this helps.




From __peter__ at web.de  Mon Sep  5 10:43:02 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 05 Sep 2011 16:43:02 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
Message-ID: <j42n5g$qm5$1@solani.org>

Kristofer Tengstr?m wrote:

> Thanks everyone, moving the declaration to the class's __init__ method
> did the trick. Now there's just one little problem left. I'm trying to
> create a list that holds the parents for each instance in the
> hierarchy. This is what my code looks like now:
> 
> -----------------------------------------
> 
> class A:
>     def __init__(self, parents=None):
>         self.sub = dict()
>         if parents:

You should explicitly test for None here; otherwise in a call like

ancestors = []
a = A(anchestors)

the list passed as an argument will not be used, which makes fore confusing 
behaviour.

>             self.parents = parents
>         else:
>             self.parents = []
>     def sub_add(self, cls):
>         hierarchy = self.parents
>         hierarchy.append(self)

Here you are adding self to the parents (that should be called ancestors) 
and pass it on to cls(...). Then -- because it's non-empty -- it will be 
used by the child, too, and you end up with a single parents list.

>         obj = cls(hierarchy)
>         self.sub[obj.id] = obj

While the minimal fix is to pass a copy

def sub_add(self, cls):
    obj = cls(self.parents + [self])
    self.sub[obj.id] = obj

I suggest that you modify your node class to keep track only of the direct 
parent instead of all ancestors. That makes the implementation more robust 
when you move a node to another parent.



From fnautaNO at SPAMsolfon.nl  Mon Sep  5 10:51:00 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Mon, 5 Sep 2011 16:51:00 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
Message-ID: <9ck5upFlpnU1@mid.individual.net>

"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:a7cd34d7-ed2b-4449-8edc-a6a45b59ecde at hb5g2000vbb.googlegroups.com...
> >
>> > Possibly.
>> > I tried this:
>> > server.py -n -c config.ini
>> > Once again, the server is up and running and when I am logging in with 
>> > my
>> > browser (10.0.0.140:8081) I can see information showing up at the 
>> > command
>> > prompt, showing somebody is logging is, but the same error:
>> > "fshandler:get_data: \Webdav not found". During starting up the server
>> > mentioned: "pywebdav:Serving data from \Webdav".
>>
>> > In the config file it says:
>> > "# main directory
>> > directory = \Webdav"
>>
>> > Perhaps my Python configuration is at fault.
>>
>> > Fokke
>>
>> Is the path supposed to be absolute? In which case you'd need to have:
>> directory=C:\path\to\Webdav
>>
>> instead of just
>> directory=\Webdav
>>
>> I tried:
>> directory=D:\Webdav
>> directory=D:/Webdav
>>
>> To no avail.
>> It didn.t make any difference.
>>
>> I surely believe my WebDAV installation is at fault.
>>
>> Fokke
>
> Interestingly, looking at the code that returns the
> "fshandler:get_data: \Webdav not found" message, it looks like it
> tests that the path given exists and then tries an os.path.isfile,
> then an os.path.isdir. If both fail you get the message that you see.
> This might be a bit of a shot in the dark but could you try the path
> with and without a trailing '/' or '\'? I don't currently have a
> windows box available to test on and figure out why it would be
> detected as existing but not test true for either a file or directory.
>

Hi Becky,

I tried it straight away:
directory=D:\Webdav\
directory=D:/Webdav/

Didn't work, in both cases the same error "fshandler:get_data: \Webdav not 
found".

I have the opinion that my WebDAV installation is at fault. The database is 
not created either.
To have set up Python, I used python-2.7.2.msi.
To install WebDAV, I used PyWebDAV-0.9.4.1 and PyXML-0.8.4 packages, both 
Unix/Linux.
To install the, I used
"
>> You dont install from "Python GUI", use normal cmd, navigate to the 
>> folder
>> you downloaded PyXML and PyWebDAV and run "python setup.py install"
>> (python.exe has to be in your PATH). Then you have to find the
>> startup-script "davserver". Find your python installation directory and
>> look into<Install dir>/Tools/Scripts, in my computer this is
>> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
>> site-packages folder i.e. E:\python27\Lib/site-packages. You might have 
>> to
>> look for "davserver" there..."

Shall I re?nstall the whole lot? Would it make a difference if in that case 
I would use ActivePython-2.7.2.5-win32-x86.msi instead of python-2.7.2.msi?

Fokke







From joncle at googlemail.com  Mon Sep  5 10:59:31 2011
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 5 Sep 2011 07:59:31 -0700 (PDT)
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
	<j42n5g$qm5$1@solani.org>
Message-ID: <9bda87ee-ac0a-4b8f-b9a9-aa0cefd1bd04@k9g2000vbd.googlegroups.com>

On Sep 5, 3:43?pm, Peter Otten <__pete... at web.de> wrote:
> Kristofer Tengstr?m wrote:
> > Thanks everyone, moving the declaration to the class's __init__ method
> > did the trick. Now there's just one little problem left. I'm trying to
> > create a list that holds the parents for each instance in the
> > hierarchy. This is what my code looks like now:
>
> > -----------------------------------------
>
> > class A:
> > ? ? def __init__(self, parents=None):
> > ? ? ? ? self.sub = dict()
> > ? ? ? ? if parents:
>
> You should explicitly test for None here; otherwise in a call like
>
> ancestors = []
> a = A(anchestors)
>
> the list passed as an argument will not be used, which makes fore confusing
> behaviour.
>
> > ? ? ? ? ? ? self.parents = parents
> > ? ? ? ? else:
> > ? ? ? ? ? ? self.parents = []
> > ? ? def sub_add(self, cls):
> > ? ? ? ? hierarchy = self.parents
> > ? ? ? ? hierarchy.append(self)
>
> Here you are adding self to the parents (that should be called ancestors)
> and pass it on to cls(...). Then -- because it's non-empty -- it will be
> used by the child, too, and you end up with a single parents list.
>
> > ? ? ? ? obj = cls(hierarchy)
> > ? ? ? ? self.sub[obj.id] = obj
>
> While the minimal fix is to pass a copy
>
> def sub_add(self, cls):
> ? ? obj = cls(self.parents + [self])
> ? ? self.sub[obj.id] = obj
>
> I suggest that you modify your node class to keep track only of the direct
> parent instead of all ancestors. That makes the implementation more robust
> when you move a node to another parent.

I may not be understanding the OP correctly, but going by what you've
put here, I might be tempted to take this kind of stuff out of the
class's and using a graph library (such as networkx) - that way if
traversal is necessary, it might be a lot easier. But once again, I
must say I'm not 100% sure what the OP wants to achieve...

Jon.


From mdekauwe at gmail.com  Mon Sep  5 11:06:10 2011
From: mdekauwe at gmail.com (Martin De Kauwe)
Date: Mon, 5 Sep 2011 08:06:10 -0700 (PDT)
Subject: Best way to print a module?
Message-ID: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>

Hi,

If I wanted to print an entire module, skipping the attributes
starting with "__" is there an *optimal* way? Currently I am doing
something like this. Note I am just using sys here to make the point

import sys

data = []
for attr in sys.__dict__.keys():
    if not attr.startswith('__') and not attr.endswith('__'):
        attr_val = getattr(sys, attr)
        data.append((attr, attr_val))
data.sort()
for i in data:
    print "%s = %s" % (i[0], i[1])

Clearly this would be quicker if I didn't store it and sort the
output, i.e.

for attr in sys.__dict__.keys():
    if not attr.startswith('__') and not attr.endswith('__'):
        attr_val = getattr(sys, attr)
        print "%s = %s" % (attr, attr_val)

Anyway if there is a better way it would be useful to hear it...

Many thanks,

Martin


From wolftracks at invalid.com  Mon Sep  5 11:15:24 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 05 Sep 2011 08:15:24 -0700
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
Message-ID: <j42p3q$poq$1@dont-email.me>

See Subject.


From rosuav at gmail.com  Mon Sep  5 11:24:19 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 6 Sep 2011 01:24:19 +1000
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <j42p3q$poq$1@dont-email.me>
References: <j42p3q$poq$1@dont-email.me>
Message-ID: <CAPTjJmpBEf=MOh3dXPePkUonJqt5FjBc+67K3sf_OvVLy_7nKQ@mail.gmail.com>

On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson <wolftracks at invalid.com> wrote:
> See Subject.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

To what extent "familiar"? I have it installed on several computers,
but only because it comes with Open Wat C/C++.

With something off-topic like this, it might be better to have a real
email address, so the responses can be off-list.

ChrisA


From __peter__ at web.de  Mon Sep  5 11:28:43 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 05 Sep 2011 17:28:43 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
	<j42n5g$qm5$1@solani.org>
	<9bda87ee-ac0a-4b8f-b9a9-aa0cefd1bd04@k9g2000vbd.googlegroups.com>
Message-ID: <j42pr5$v2l$1@dough.gmane.org>

Jon Clements wrote:

> I
> must say I'm not 100% sure what the OP wants to achieve...

Learn Python? 

;)



From wolftracks at invalid.com  Mon Sep  5 12:15:20 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 05 Sep 2011 09:15:20 -0700
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <mailman.775.1315236269.27778.python-list@python.org>
References: <j42p3q$poq$1@dont-email.me>
	<mailman.775.1315236269.27778.python-list@python.org>
Message-ID: <j42sk7$lnj$1@dont-email.me>

On 9/5/2011 8:24 AM, Chris Angelico wrote:
> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>  wrote:
>> See Subject.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
> To what extent "familiar"? I have it installed on several computers,
> but only because it comes with Open Wat C/C++.
>
> With something off-topic like this, it might be better to have a real
> email address, so the responses can be off-list.
>
> ChrisA

sierra_mtnview @ sbcglobal.net
Here's the story.

As far as I can tell F77 1.8 is not available.  I've Googled quite a bit 
for it.  My source for 1.9 is 
<http://www.openwatcom.org/index.php/Download>. It gives me: 
open-watcom-f77-win32-1.9.exe.

When I install, there are only choices: Custom, which presumably will 
ask a lot of questions, and some one shot do-it without any 
intervention.  I took the latter.

..., XP, and no Win7? I use Win7. Trouble??

Something is amiss with my install. I downloaded 1.9. I did not use any 
customization.

  I can bring up the IDE easily. Using it is a different matter. The 
only Getting Started in F77 manual I can find is shown as v1.8.  If 1.9 
is needed, I can't find it. If I use the 1.8 manual, then the contents 
don't match up with what I find in the F77 IDE.  For example, the manual 
talks about a Kitchen project on page 15.  Not found anywhere in the 
install folder.



From dannagle at verizon.net  Mon Sep  5 12:22:51 2011
From: dannagle at verizon.net (Dan Nagle)
Date: Mon, 5 Sep 2011 12:22:51 -0400
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
References: <j42p3q$poq$1@dont-email.me> <j42sk7$lnj$1@dont-email.me>
Message-ID: <j42t0r$oht$1@dont-email.me>

Hello,

On 2011-09-05 16:15:20 +0000, W. eWatson said:

> On 9/5/2011 8:24 AM, Chris Angelico wrote:
>> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>  wrote:
>>> See Subject.

<snip>

>>> To what extent "familiar"? I have it installed on several computers,
>> but only because it comes with Open Wat C/C++.
>> 
>> With something off-topic like this,

<snip>

>> sierra_mtnview @ sbcglobal.net
> Here's the story.
> 
> As far as I can tell F77 1.8 is not available.  I've Googled quite a 
> bit for it.  My source for 1.9 is 
> <http://www.openwatcom.org/index.php/Download>. It gives me: 
> open-watcom-f77-win32-1.9.exe.

On Usenet, comp.lang.fortran might be the best source of help for this.
There's a good chance one of the regulars there can answer you
within one or two posts.  (I'll not cross-post, you can choose for yourself.)

HTH

-- 
Cheers!

Dan Nagle



From k.sahithi2862 at gmail.com  Mon Sep  5 12:23:00 2011
From: k.sahithi2862 at gmail.com (SAHITHI)
Date: Mon, 5 Sep 2011 09:23:00 -0700 (PDT)
Subject: FOR FAST UPDATES IN TELUGU FILM INDUSTRY
Message-ID: <9da5ae2b-4615-4bb6-bcd6-8b6ef68962bf@p37g2000prp.googlegroups.com>

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From rantingrick at gmail.com  Mon Sep  5 12:30:19 2011
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 5 Sep 2011 09:30:19 -0700 (PDT)
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
Message-ID: <0460d27a-ce73-40f5-a31a-6772eacb7784@l7g2000vbz.googlegroups.com>

On Sep 5, 10:06?am, Martin De Kauwe <mdeka... at gmail.com> wrote:
> Hi,
>
> If I wanted to print an entire module, skipping the attributes
> starting with "__" is there an *optimal* way? Currently I am doing
> something like this. Note I am just using sys here to make the point
>
> import sys
>
> data = []
> for attr in sys.__dict__.keys():
> ? ? if not attr.startswith('__') and not attr.endswith('__'):
> ? ? ? ? attr_val = getattr(sys, attr)
> ? ? ? ? data.append((attr, attr_val))
> data.sort()
> for i in data:
> ? ? print "%s = %s" % (i[0], i[1])
>
> Clearly this would be quicker if I didn't store it and sort the
> output, i.e.
>
> for attr in sys.__dict__.keys():
> ? ? if not attr.startswith('__') and not attr.endswith('__'):
> ? ? ? ? attr_val = getattr(sys, attr)
> ? ? ? ? print "%s = %s" % (attr, attr_val)
>
> Anyway if there is a better way it would be useful to hear it...
>
> Many thanks,
>
> Martin

Martin, have you considered that your custom function is just re-
inventing the built-in dir() function? I would suggest using a list
comprehension against the dir() function with a predicate to remove
anything that startswith '_'. Here's some Ruby code to solve the
problem. I'll let you figure out the Python equivalent.

rb> ['_hello', '__goodbye__', 'whatsup'].select{|x| x[0].chr != '_'}
["whatsup"]



From cjw at ncf.ca  Mon Sep  5 12:36:59 2011
From: cjw at ncf.ca (Colin J. Williams)
Date: Mon, 05 Sep 2011 12:36:59 -0400
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <j42t0r$oht$1@dont-email.me>
References: <j42p3q$poq$1@dont-email.me> <j42sk7$lnj$1@dont-email.me>
	<j42t0r$oht$1@dont-email.me>
Message-ID: <j42trk$rh9$1@dough.gmane.org>

On 05-Sep-11 12:22 PM, Dan Nagle wrote:
> Hello,
>
> On 2011-09-05 16:15:20 +0000, W. eWatson said:
>
>> On 9/5/2011 8:24 AM, Chris Angelico wrote:
>>> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>
>>> wrote:
>>>> See Subject.
>
> <snip>
>
>>>> To what extent "familiar"? I have it installed on several computers,
>>> but only because it comes with Open Wat C/C++.
>>>
>>> With something off-topic like this,
>
> <snip>
>
>>> sierra_mtnview @ sbcglobal.net
>> Here's the story.
>>
>> As far as I can tell F77 1.8 is not available. I've Googled quite a
>> bit for it. My source for 1.9 is
>> <http://www.openwatcom.org/index.php/Download>. It gives me:
>> open-watcom-f77-win32-1.9.exe.
>
> On Usenet, comp.lang.fortran might be the best source of help for this.
> There's a good chance one of the regulars there can answer you
> within one or two posts. (I'll not cross-post, you can choose for
> yourself.)
>
> HTH
>

You might get in touch with someone at Waterloo University, which is 
located in Kitchener/Waterloo.

This could have come from the 60's or 70's.

Good luck.

Colin W.



From tjreedy at udel.edu  Mon Sep  5 13:38:08 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 13:38:08 -0400
Subject: Need help with simple OOP Python question
In-Reply-To: <93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
Message-ID: <j431fj$fh5$1@dough.gmane.org>

On 9/5/2011 9:15 AM, Kristofer Tengstr?m wrote:
> Thanks everyone, moving the declaration to the class's __init__ method
> did the trick. Now there's just one little problem left. I'm trying to
> create a list that holds the parents for each instance in the
> hierarchy. This is what my code looks like now:
>
> -----------------------------------------
>
> class A:
>      def __init__(self, parents=None):
>          self.sub = dict()
>          if parents:
>              self.parents = parents
>          else:
>              self.parents = []
>      def sub_add(self, cls):
>          hierarchy = self.parents
>          hierarchy.append(self)
>          obj = cls(hierarchy)
>          self.sub[obj.id] = obj

Indexing objects by their internal id is usually useless. Considier 
whether you should be using sets rather than dicts.

-- 
Terry Jan Reedy




From noreply at domain.invalid  Mon Sep  5 13:45:25 2011
From: noreply at domain.invalid (William Gill)
Date: Mon, 05 Sep 2011 13:45:25 -0400
Subject: Functions vs OOP
In-Reply-To: <d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
References: <j3tjov$c30$1@dont-email.me>
	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
Message-ID: <j431q1$rrl$1@dont-email.me>

On 9/4/2011 9:13 AM, rusi wrote:
> On Sep 3, 9:15 pm, William Gill<nore... at domain.invalid>  wrote:
>> During some recent research, and re-familiarization with Python, I came
>> across documentation that suggests that programming using functions, and
>> programming using objects were somehow opposing techniques.
>
> Staying with (for the moment) the suggestion that OO-P and F-P are
> complementary, I believe it is worthwhile to distinguish syntactic OO-
> P vs F-P from semantic OO-P vs F-P.
>
> Syntactically: f(x) is functional x.f() is object oriented.
> Semantically if f's return value depends only on x ie does not depend
> on state it is functional (in the math sense) -- the jargon is that f
> is referentially transparent.

Not to split hairs, but syntactically f(x) is a function in many 
programming paradigms.

As I understand it functional programming places specific requirements 
on functions, i.e.referential transparency.  So f(x) may or may not be 
"functional".

x.f() is also a function, but it is a member of the object x, is 
referred to as a 'method' of x, and uses the syntactical "dot" notation 
object"dot"function for identification.

> Referential opaqueness is usually such a source of problems that it
> turns out good to contain the problem somewhat -- hence the wish for
> encapsulation.
>
> One can find in the python library itself all 4 combinations:
> syntactically and semantically OO : sort
> syntactically and semantically FP: sorted
> syntactically OO semantically FP: join



From nospam at domain.invalid  Mon Sep  5 14:58:29 2011
From: nospam at domain.invalid (William Gill)
Date: Mon, 05 Sep 2011 14:58:29 -0400
Subject: Functions vs OOP
In-Reply-To: <4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4364s$ia6$1@dont-email.me>

On 9/3/2011 12:25 PM, Steven D'Aprano wrote:
> William Gill wrote:
>
>> Are they suggesting that any function that takes an object as an
>> argument should always be a method of that object?
>
> Yes.

I can think of times when a special application, such as a converter, 
would take an object as an argument, but the somewhat unique nature of 
the application wouldn't justify changing the class to make the behavior 
into a method.

I could extend the underlying class to include the new behavior 
(method), but that would mean existing instances of the base class would 
need conversion to the new class, requiring yet another method.

Seems to me, that would be POOP (Puristic Object Oriented Programming) ;-)



From jeanmichel at sequans.com  Mon Sep  5 15:04:37 2011
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 05 Sep 2011 21:04:37 +0200
Subject: Functions vs OOP
In-Reply-To: <j431q1$rrl$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
	<j431q1$rrl$1@dont-email.me>
Message-ID: <4E651D45.4020602@sequans.com>

William Gill wrote:
>
> Not to split hairs, but syntactically f(x) is a function in many 
> programming paradigms.
>
> As I understand it functional programming places specific requirements 
> on functions, i.e.referential transparency.  So f(x) may or may not be 
> "functional".
>
> x.f() is also a function, but it is a member of the object x, is 
> referred to as a 'method' of x, and uses the syntactical "dot" 
> notation object"dot"function for identification.
>

Functional programming is not about writing a programm with functions 
(google it for more info). This may cause some confusion.

Your original post was about functions vs methods, which are identical 
except some syntax detail. FYI, in python x.f() is equivalent to f(x). 
In an OOP world one will  prefer the x.f() form.


JM





From timr at probo.com  Mon Sep  5 16:07:15 2011
From: timr at probo.com (Tim Roberts)
Date: Mon, 05 Sep 2011 13:07:15 -0700
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
Message-ID: <traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>

Martin De Kauwe <mdekauwe at gmail.com> wrote:
>
>If I wanted to print an entire module, skipping the attributes
>starting with "__" is there an *optimal* way? 

Your question is somewhat ambiguous.  When I read "print an entire module",
I assumed you were asking for a way to print the source code, perhaps with
syntax coloring.

Surely there is no reason to have an "optimal" method of doing this -- this
is never going to be in an inner loop.  If you have a method that works,
there is little justification to optimize...
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From jredgrave at capisco.com  Mon Sep  5 16:38:18 2011
From: jredgrave at capisco.com (Jon Redgrave)
Date: Mon, 5 Sep 2011 13:38:18 -0700 (PDT)
Subject: One line command line filter
Message-ID: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>

It seems unreasonably hard to write simple one-line unix command line
filters in python:

eg: ls | python -c "<something>  print x.upper()"

to get at sys.stdin or similar needs an import, which makes a
subsequent for-loop illegal.
python -c "import sys; for x in sys.stdin(): print x" <<- SyntaxError

Am I missing something obvious?

The best I've come up with is to use sitecustomize.py to add to
__builtin__
def stdin():
  import sys
  for x in sys.stdin():
    if not x: return
    yield x.strip()
import __builtin__
__builtin__.stdin = stdin

This allows
ls | python -c "for x in stdin(): print x.upper()"

Is there a better solution - if not is this worth a PEP?


From t at jollybox.de  Mon Sep  5 16:47:23 2011
From: t at jollybox.de (Thomas Jollans)
Date: Mon, 05 Sep 2011 22:47:23 +0200
Subject: One line command line filter
In-Reply-To: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <4E65355B.8040503@jollybox.de>

On 05/09/11 22:38, Jon Redgrave wrote:
> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
> 
> eg: ls | python -c "<something>  print x.upper()"
> 
> to get at sys.stdin or similar needs an import, which makes a
> subsequent for-loop illegal.
> python -c "import sys; for x in sys.stdin(): print x" <<- SyntaxError
> 
> Am I missing something obvious?

ls | python -c "for line in __import__('sys').stdin: print (line.upper())"


From jredgrave at capisco.com  Mon Sep  5 17:32:08 2011
From: jredgrave at capisco.com (Jon Redgrave)
Date: Mon, 5 Sep 2011 14:32:08 -0700 (PDT)
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.781.1315255602.27778.python-list@python.org>
Message-ID: <39f1dbdb-9e25-43b8-b293-395ccfc76e50@p10g2000yqi.googlegroups.com>

> > Am I missing something obvious?
>
> ls | python -c "for line in __import__('sys').stdin: print (line.upper())"

Ah, so I am missing something - it is possible - but 'obvious'?
Do people think it should be more accessible


From pythonfiddle at gmail.com  Mon Sep  5 18:00:36 2011
From: pythonfiddle at gmail.com (Python Fiddle Admin)
Date: Mon, 5 Sep 2011 15:00:36 -0700 (PDT)
Subject: Running Python Demo on the Web?
Message-ID: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>

Python has been ported to the web browser at pythonfiddle.com. Python
Fiddle can import snippets of code that you are reading on a web page
and run them in the browser. It supports a few popular libraries.

Another common usage is to post code on the site to allow other people
to play around with it. Also, it can be used to demonstrate a working
program.


From tjreedy at udel.edu  Mon Sep  5 18:21:56 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 18:21:56 -0400
Subject: One line command line filter
In-Reply-To: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <j43i3p$s67$1@dough.gmane.org>

On 9/5/2011 4:38 PM, Jon Redgrave wrote:
> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
>
> eg: ls | python -c "<something>   print x.upper()"
>
> to get at sys.stdin or similar needs an import, which makes a
> subsequent for-loop illegal.
> python -c "import sys; for x in sys.stdin(): print x"<<- SyntaxError
>
> Am I missing something obvious?

The doc says "-c <command>
Execute the Python code in command. command can be one or more 
statements separated by newlines,"

However, I have no idea how to put newlines into a command-line string. 
Changing '; ' to '\n' does not work, at least not in Windows. The '\n' 
is passed on to Python as 2 chars, and the '\' is seen as the 
line-continuation char and the 'n' as illegal following it. Will a *nix 
shell 'cook' the string and convert '\n' to a literal newline before 
passing it to Python?

For *nix, I would expect the <<EOF mechanism to work. Have you tried that?

That said, Python is designed for named multiple-statement programs,
just as it is designed for named multiple-statement functions. Or it is 
designed for interactive work.

The following works:
dir | python -c "while True: print(input())"

except that it finishes with an error traceback:
Traceback (most recent call last):
   File "<string>", line 1, in <module>
EOFError: EOF when reading a line

Perhaps tolerable if Python is at the end of the pipe, not otherwise.

 > Is there a better solution - if not is this worth a PEP?

PEPs have to propose a concrete solution, preferably with some previous 
discussion. I take is that your proposal would be to add another builtin 
means to access stdin.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep  5 18:55:36 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 18:55:36 -0400
Subject: Functions vs OOP
In-Reply-To: <j431q1$rrl$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
	<j431q1$rrl$1@dont-email.me>
Message-ID: <j43k2r$72g$1@dough.gmane.org>

On 9/5/2011 1:45 PM, William Gill wrote:
> On 9/4/2011 9:13 AM, rusi wrote:
>> On Sep 3, 9:15 pm, William Gill<nore... at domain.invalid> wrote:
>>> During some recent research, and re-familiarization with Python, I came
>>> across documentation that suggests that programming using functions, and
>>> programming using objects were somehow opposing techniques.
>>
>> Staying with (for the moment) the suggestion that OO-P and F-P are
>> complementary, I believe it is worthwhile to distinguish syntactic OO-
>> P vs F-P from semantic OO-P vs F-P.
>>
>> Syntactically: f(x) is functional x.f() is object oriented.
>> Semantically if f's return value depends only on x ie does not depend
>> on state it is functional (in the math sense) -- the jargon is that f
>> is referentially transparent.
>
> Not to split hairs, but syntactically f(x) is a function in many
> programming paradigms.
>
> As I understand it functional programming places specific requirements
> on functions, i.e.referential transparency. So f(x) may or may not be
> "functional".

In Python, it may be a parameterized procedure. Some languages separate 
functions and procedures (also called subroutines). Python does not. 
(Or you could say that it makes procedures into functions with 
side-effects by returning None by default).

> x.f() is also a function, but it is a member of the object x, is
> referred to as a 'method' of x, and uses the syntactical "dot" notation
> object"dot"function for identification.
>
>> Referential opaqueness is usually such a source of problems that it
>> turns out good to contain the problem somewhat -- hence the wish for
>> encapsulation.
>>
>> One can find in the python library itself all 4 combinations:
>> syntactically and semantically OO : sort
>> syntactically and semantically FP: sorted
>> syntactically OO semantically FP: join
>


-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep  5 19:02:04 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 19:02:04 -0400
Subject: One line command line filter
In-Reply-To: <39f1dbdb-9e25-43b8-b293-395ccfc76e50@p10g2000yqi.googlegroups.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.781.1315255602.27778.python-list@python.org>
	<39f1dbdb-9e25-43b8-b293-395ccfc76e50@p10g2000yqi.googlegroups.com>
Message-ID: <j43kf0$90e$1@dough.gmane.org>

On 9/5/2011 5:32 PM, Jon Redgrave wrote:
>>> Am I missing something obvious?
>>
>> ls | python -c "for line in __import__('sys').stdin: print (line.upper())"
>
> Ah, so I am missing something - it is possible - but 'obvious'?
> Do people think it should be more accessible

__import__ is well-documented and is listed in the index of the builtin 
functions chapter. "Direct use of __import__() is rare, except in cases 
where you want to import a module whose name is only known at runtime." 
could be explanded to include "or where you want to import as part of an 
expression"

Every Python programmer should peruse that chapter to learn what is 
available for possible future use.

-- 
Terry Jan Reedy



From mdekauwe at gmail.com  Mon Sep  5 19:02:41 2011
From: mdekauwe at gmail.com (Martin De Kauwe)
Date: Mon, 5 Sep 2011 16:02:41 -0700 (PDT)
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
	<traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>
Message-ID: <9c0733c8-875b-425a-9021-5f22bf75d1a6@m4g2000pri.googlegroups.com>

Hi,

Tim yes I had a feeling my posting might be read as ambiguous! Sorry I
was trying to quickly think of a good example. Essentially I have a
set of .ini parameter files which I read into my program using
configobj, I then replace the default module parameters if the user
file is different (in my program). When it comes to writing the data
back out I need to potentially loop over 5 module files and I need to
ignore the superfluous information. My guess is that the way I am
doing it might be a little on the slow side, hence the posting. Like
you said it might be that the way I am doing it is "fine", I just
wanted to see if there was a better way that is all.

Rantingrick I did actually try the dir() to start with, I can't
remember why I changed back. I will try your suggestion and see
(thanks)

So instead of sys as per my example my module more realistically looks
like this:

params.py

apples = 12.0
cats = 14.0
dogs = 1.3

so my fuller example then

import sys
sys.path.append("/Users/mdekauwe/Desktop/")
import params

#params.py contains
#apples = 12.0
#cats = 14.0
#dogs = 1.3

fname = "test.asc"
try:
    ofile = open(fname, 'w')
except IOError:
    raise IOError("Can't open %s file for write" % fname)

data = []
for attr in params.__dict__.keys():
    if not attr.startswith('__') and not attr.endswith('__'):
        attr_val = getattr(params, attr)
        data.append((attr, attr_val))

data.sort()
try:
    ofile.write("[params]\n")
    for i in data:
        ofile.write("%s = %s\n" % (i[0], i[1]))
except IOError:
    raise IOError("Error writing params files, params section")


etc, etc
thanks



From simoncropper at fossworkflowguides.com  Mon Sep  5 19:09:17 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Tue, 06 Sep 2011 09:09:17 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <624f5caf-e3c1-4a88-9861-606f7e2705e8@x14g2000prn.googlegroups.com>
References: <mailman.765.1315202654.27778.python-list@python.org>
	<624f5caf-e3c1-4a88-9861-606f7e2705e8@x14g2000prn.googlegroups.com>
Message-ID: <4E65569D.9000603@fossworkflowguides.com>

On 06/09/11 00:40, alex23 wrote:
> On Sep 5, 3:18 pm, Simon Cropper<simoncrop... at fossworkflowguides.com>
> wrote:
>> My investigations have generally found that windows/forms/data entry
>> screen can be created for a specific table or view, but these are
>> hard-wired during development. Is there anyway of rapidly defining the
>> grid during runtime so any table can be viewed?
>
> The commercial product Resolver One provides a grid/spreadsheet style
> interface with Python scripting capabilities. I'm not sure of its
> current licensing status but I believe it used to be free if used on
> open source projects.
>
> http://www.resolversystems.com/products/resolver-one/
>
> Each spreadsheet itself is Python code; I think it should be quite do-
> able to take something with introspective SQL capabilities like
> SQLAlchemy and have it title columns and fill them with the correct
> fields accordingly.
>
> Hope this helps.
>
>

Alex,

The Resolver Package looks good. Not exactly open source though. I 
equate it to a proprietary package that can at times be used for free by 
select groups.

The product creates spreadsheets with python code in the background 
(instead of say VBA in Excel or Basic in Calc).

Access to a database still needs to be hard-wired, so it does not act as 
a 'dynamic' viewer. The product works pretty much like Excel and Calc in 
this manner.

Sheets can be shared, although the Resolver Exchange website does not 
clarify the licence under which samples are released (GPL, CC, etc), so 
it is debatable how any of this could reliably be used in creation of 
derivatives.

 From what I can glean from this page...

      http://www.resolversystems.com/opensource/

      ... Resolver will allow you to use the package if you are an open 
source project to create spreadsheets that can be redistributed. For 
people to use these sheets they need to download the viewer or purchase 
the package.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From steve+comp.lang.python at pearwood.info  Mon Sep  5 19:18:37 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 09:18:37 +1000
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.782.1315261387.27778.python-list@python.org>
Message-ID: <4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>

Terry Reedy wrote:

> The doc says "-c <command>
> Execute the Python code in command. command can be one or more
> statements separated by newlines,"
> 
> However, I have no idea how to put newlines into a command-line string.

I imagine that it depends on the shell you are using, but bash on Linux
makes it simple: double quotes "..." are like Python's triple-quoted
strings in that they can include newlines.

[steve at sylar python]$ ls f*.py | python -c "import sys
> print sys.stdin.read()"
factorial.py
fetchqm.py
fib.py
fileutils.py
findsingle.py
fixascii.py
fix.py
frange.py
frequencies.py


Other shells may be different.


-- 
Steven



From mdekauwe at gmail.com  Mon Sep  5 19:20:42 2011
From: mdekauwe at gmail.com (Martin De Kauwe)
Date: Mon, 5 Sep 2011 16:20:42 -0700 (PDT)
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
	<traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>
	<9c0733c8-875b-425a-9021-5f22bf75d1a6@m4g2000pri.googlegroups.com>
Message-ID: <5de6e076-f25a-4a44-ba9b-2c99ff006565@e20g2000prn.googlegroups.com>

Trying to follow the suggestion this would be the alternate
implementation.

import sys
sys.path.append("/Users/mdekauwe/Desktop/")
import params

#params.py contains
#apples = 12.0
#cats = 14.0
#dogs = 1.3

fname = "test.asc"
try:
    ofile = open(fname, 'w')
except IOError:
    raise IOError("Can't open %s file for write" % fname)

attributes = [attr for attr in dir(params) if not
attr.startswith('__')]
attributes.sort()

try:
    ofile.write("[params]\n")
    for i in attributes:
        ofile.write("%s = %s\n" % (i, getattr(params, i)))
except IOError:
    raise IOError("Error writing params files, params section")

Is that a better version? I honestly don't know.

thanks


From steve+comp.lang.python at pearwood.info  Mon Sep  5 19:29:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 09:29:00 +1000
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <4e655b3e$0$29982$c3e8da3$5496439d@news.astraweb.com>

Jon Redgrave wrote:

> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
> 
> eg: ls | python -c "<something>  print x.upper()"

Python is neither bash nor Perl. It is not intended to compete in the "quick
and dirty one-liner commands" stakes.

However, you might like to consider ipython, which is intended as a complete
Python shell, not just an interactive interpreter.

http://ipython.org/


[...]
> The best I've come up with is to use sitecustomize.py to add to
> __builtin__

If you're a system administrator who wants to replace bash one-liners at the
command line with Python one-liners, sure, why not?

If you build up a useful collection of sys admin tools or recipes, you might
like to consider sharing them. Perhaps if Python was used more by sys
admins, there might be less resistance to making it easier to compete with
bash one-liners.


-- 
Steven



From steve+comp.lang.python at pearwood.info  Mon Sep  5 19:46:16 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 09:46:16 +1000
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
	<traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>
Message-ID: <4e655f4a$0$29965$c3e8da3$5496439d@news.astraweb.com>

Tim Roberts wrote:

> Martin De Kauwe <mdekauwe at gmail.com> wrote:
>>
>>If I wanted to print an entire module, skipping the attributes
>>starting with "__" is there an *optimal* way?
> 
> Your question is somewhat ambiguous.  When I read "print an entire
> module", I assumed you were asking for a way to print the source code,
> perhaps with syntax coloring.
> 
> Surely there is no reason to have an "optimal" method of doing this --
> this is never going to be in an inner loop.

Regardless of an inner loop or not, the time required for IO (reading the
file from disk, writing it to a printer) will be much larger than the time
required to skip dunder (double-underscore) objects.

> If you have a method that works, 
> there is little justification to optimize...

Pretty much.

HOWEVER, having agreed with you in general, in this specific case it is
obvious to me from context that the OP doesn't want to print the source
code of the module, but the module's names and their values.

I'd try a couple of approaches:

- use dir() or vars() to get the module's names, then loop and print each
one;

- make a shallow copy of the module __dict__, less dunder names, and pass it
to the prettyprint module for printing.



-- 
Steven



From nospam at domain.invalid  Mon Sep  5 20:30:47 2011
From: nospam at domain.invalid (William Gill)
Date: Mon, 05 Sep 2011 20:30:47 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.780.1315249547.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>	<j431q1$rrl$1@dont-email.me>
	<mailman.780.1315249547.27778.python-list@python.org>
Message-ID: <j43pju$s3j$1@dont-email.me>

On 9/5/2011 3:04 PM, Jean-Michel Pichavant wrote:
> William Gill wrote:
>>
>> Not to split hairs, but syntactically f(x) is a function in many
>> programming paradigms.
>>
>> As I understand it functional programming places specific requirements
>> on functions, i.e.referential transparency. So f(x) may or may not be
>> "functional".
>>
>> x.f() is also a function, but it is a member of the object x, is
>> referred to as a 'method' of x, and uses the syntactical "dot"
>> notation object"dot"function for identification.
>>
>
> Functional programming is not about writing a programm with functions
> <snip>. This may cause some confusion.

It can, and it did.  That was the impression I (incorrectly) got from 
the documentation.  Which didn't make sense to me.


> (google it for more info).

I can, and I did.  That, and the answers I got in this ng are how I 
corrected my misconception.

>
> Your original post was about functions vs methods, which are identical
> except some syntax detail. FYI, in python x.f() is equivalent to f(x).
> In an OOP world one will prefer the x.f() form.
>
No, my original post was about how (based on the aforementioned 
misconception) the documentation seemed to suggest that OOP should never 
have free standing functions, only methods.



From nospam at torek.net  Mon Sep  5 21:10:40 2011
From: nospam at torek.net (Chris Torek)
Date: 6 Sep 2011 01:10:40 GMT
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<4e5e5628$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<j3m4pg01enu@news4.newsguy.com>
	<m2wrdnf53u.fsf@cochabamba.vanoostrum.org>
Message-ID: <j43rug02nqb@news1.newsguy.com>

>Chris Torek <nospam at torek.net> writes:
>[snip]
>> when you have [an] instance and call [an] instance or class method:

[note: I have changed the names very slightly here, and removed
additional arguments, on purpose]

>>     black_knight = K()
>>     black_knight.spam()
>>     black_knight.eggs()
>>
>> the first parameters ... are magic, and invisible.
>>
>> Thus, Python is using the "explicit is better than implicit" rule
>> in the definition, but not at the call site. ...

In article <m2wrdnf53u.fsf at cochabamba.vanoostrum.org>
Piet van Oostrum  <piet at vanoostrum.org> wrote:
>It *is* explicit also at the call site. It only is written at the left
>of the dot rather than at the right of the parenthesis.

It cannot possibly be explicit.  The first parameter to one of the
method functions is black_knight, but the first parameter to the
other method is black_knight.__class__.

Which one is which?  Is spam() the instance method and eggs() the
class method, or is spam() the class method and eggs the instance
method?  (One does not, and should not, have to *care*, which is
kind of the point here. :-) )

>And that is necessary to locate which definition of the method
>applies.

By "that" I assume you mean the name "black_knight" here.  But the
name is not required to make the call; see the last line of the
following code fragment:

    funclist = []
    ...
    black_knight = K()
    funclist.append(black_knight.spam)
    funclist.append(black_knight.eggs)
    ...
    # At this point, let's say len(funclist) > 2,
    # and some number of funclist[i] entries are ordinary
    # functions that have no special first parameter.
    random.choice(funclist)()

>It would be silly to repeat this information after the parenthesis.
>Not only silly, it would be stupid as it would be a source of errors,
>and an example of DRY.

Indeed.  But I believe the above is a demonstration of how the
"self" or "cls" parameter is in fact implicit, not explicit.

(I am using python 2.x, and doing this in the interpreter:

    random.choice(funclist)

-- without the parentheses to call the function -- produces:

    <bound method K.[name omitted] of <__main__.K object at 0x249f50>>
    <bound method type.[name omitted] of <class '__main__.K'>>
    <function ordinary at 0x682b0>

The first is the instance method, whose name I am still keeping
secret; the second is the class method; and the third is the ordinary
function I added to the list.  The actual functions print their
own name and their parameters if any, and one can see that the
class and instance methods get one parameter, and the ordinary
function gets none.)
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From tjreedy at udel.edu  Mon Sep  5 21:25:44 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 21:25:44 -0400
Subject: One line command line filter
In-Reply-To: <4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.782.1315261387.27778.python-list@python.org>
	<4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j43ssc$nee$1@dough.gmane.org>

On 9/5/2011 7:18 PM, Steven D'Aprano wrote:
> Terry Reedy wrote:
>
>> The doc says "-c<command>
>> Execute the Python code in command. command can be one or more
>> statements separated by newlines,"
>>
>> However, I have no idea how to put newlines into a command-line string.
>
> I imagine that it depends on the shell you are using, but bash on Linux
> makes it simple: double quotes "..." are like Python's triple-quoted
> strings in that they can include newlines.
>
> [steve at sylar python]$ ls f*.py | python -c "import sys
>> print sys.stdin.read()"
> factorial.py
> fetchqm.py

I was guessing that whoever wrote the doc could do something like that. 
As far as I know, there is no way to escape a newline with Windows 
cmd.exe. (Someone please tell me if I am wrong!) An "unmatched" quote is 
either ignored or matched by the newline!

C:\Programs\Python32> python -c "print('haha')
haha

-- 
Terry Jan Reedy



From jabba.laci at gmail.com  Mon Sep  5 21:36:46 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Mon, 5 Sep 2011 21:36:46 -0400
Subject: download pages using a cookies.txt file
Message-ID: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>

Hi,

I would like to download a page that requires authentication with
cookies. I've already figured out how to do it with wget (blog post
here: http://bit.ly/pp25LP). In short:
(1) extract cookies from Firefox's cookies.sqlite and store them in a text file
(2) wget --cookies=on --load-cookies=cookies.txt
--keep-session-cookies "http://..."

My question is: how to do it from Python? If possible, I want to avoid
making external calls to wget.

Thanks,

Laszlo


From sahil at FreeBSD.org  Mon Sep  5 21:45:02 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Mon, 5 Sep 2011 21:45:02 -0400
Subject: download pages using a cookies.txt file
In-Reply-To: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
References: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
Message-ID: <20110906014502.GE254@magic.hamla.org>

On Mon, 2011-09-05 at 21:36:46 -0400, Jabba Laci wrote:

> I would like to download a page that requires authentication with
> cookies. I've already figured out how to do it with wget (blog post
> here: http://bit.ly/pp25LP). In short:
> (1) extract cookies from Firefox's cookies.sqlite and store them in a text file
> (2) wget --cookies=on --load-cookies=cookies.txt
> --keep-session-cookies "http://..."
> 
> My question is: how to do it from Python? If possible, I want to avoid
> making external calls to wget.

Have you already explored the cookielib (known as http.cookiejar in
Python 3.0) module?

-- 
Sahil Tandon <sahil at FreeBSD.org>


From clp2 at rebertia.com  Mon Sep  5 22:19:17 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 5 Sep 2011 19:19:17 -0700
Subject: download pages using a cookies.txt file
In-Reply-To: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
References: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
Message-ID: <CAMZYqRTEnda-nidjk+uckAOCCx1e8q_kv2GN=8E9WxzSw10Uxg@mail.gmail.com>

On Mon, Sep 5, 2011 at 6:36 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> I would like to download a page that requires authentication with
> cookies. I've already figured out how to do it with wget (blog post
> here: http://bit.ly/pp25LP). In short:
> (1) extract cookies from Firefox's cookies.sqlite and store them in a text file
> (2) wget --cookies=on --load-cookies=cookies.txt
> --keep-session-cookies "http://..."
>
> My question is: how to do it from Python?

http://docs.python.org/library/cookielib.html#cookielib.MozillaCookieJar

Cheers,
Chris


From rantingrick at gmail.com  Mon Sep  5 23:58:30 2011
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 5 Sep 2011 20:58:30 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
Message-ID: <90128a68-1a3c-433a-8cf8-efa3b130d7ea@hb5g2000vbb.googlegroups.com>

On Aug 31, 9:35?am, "T. Goodchild" <tgoodch... at gmail.com> wrote:
> I?m new to Python, and I love it. ?The philosophy of the language (and
> of the community as a whole) is beautiful to me.

Welcome aboard mate!

> But one of the things that bugs me

Oh here we go! :-)

>  is the requirement that all class
> methods have 'self' as their first parameter. ?On a gut level, to me
> this seems to be at odds with Python?s dedication to simplicity.

It will will seem odd at first. I too hated typing all those "selfs"
all the time. But believe me my new friend in no time those selfs will
roll of your fingers with great ease. You'll forget how much you hate
them and find much more to complain about.

Like for instance: I really lament the missing redundancy of Explicit
Lexical Scoping in python. For me global variables should have to be
qualified.

> For example, consider Python?s indent-sensitive syntax. ?
> [...]
> and the result was a significantly improved
> signal-to-noise ratio in the readability of Python code.

Yes, forced indention is my favorite aspect of Python!

> So why is 'self' necessary on class methods?

It could be that Guido has a exaggerated self importance and just
liked the sound of all those selfs whist reading source code. However
i believe the real reason is really readability! It takes a while to
understand this aspect because the natural human response is to be
lazy (for instance i could have used "used to" in the previous
sentence if i was slothful). We are all inherently lazy beings who
need structure to keep us from spiraling out of control into the abyss
of selfishness.

GvR: Computer Scientist and Behavioral psychologist.


From steve+comp.lang.python at pearwood.info  Tue Sep  6 00:31:25 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 14:31:25 +1000
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<4e5e5628$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<j3m4pg01enu@news4.newsguy.com>
	<m2wrdnf53u.fsf@cochabamba.vanoostrum.org>
	<j43rug02nqb@news1.newsguy.com>
Message-ID: <4e65a21e$0$29969$c3e8da3$5496439d@news.astraweb.com>

On Tue, 6 Sep 2011 11:10 am Chris Torek wrote:

>>>     black_knight = K()
>>>     black_knight.spam()
>>>     black_knight.eggs()
>>>
>>> the first parameters ... are magic, and invisible.
>>>
>>> Thus, Python is using the "explicit is better than implicit" rule
>>> in the definition, but not at the call site. ...
> 
> In article <m2wrdnf53u.fsf at cochabamba.vanoostrum.org>
> Piet van Oostrum  <piet at vanoostrum.org> wrote:
>>It *is* explicit also at the call site. It only is written at the left
>>of the dot rather than at the right of the parenthesis.
> 
> It cannot possibly be explicit.  The first parameter to one of the
> method functions is black_knight, but the first parameter to the
> other method is black_knight.__class__.


I think you are expecting more explicitness than actually required. There
are degrees of explicitness:

- The current President of the United States is a black man.

- On 6th September 2011, the duly constituted President of the United 
  States of America is a black man.

- On 6th September 2011, the duly constituted government official with 
  the title of President of the nation known as the United States of 
  America is an individual member of the species Homo sapiens with XY
  chromosomes and of recent African ancestry.

As opposed to implicit:

- He is a black guy.


There is no requirement for every last gory detail to be overtly specified
in full. I quote from WordNet:

explicit
     adj 1: precisely and clearly expressed or readily observable;
            leaving nothing to implication; "explicit
            instructions"; "she made her wishes explicit";
            "explicit sexual scenes" [syn: expressed] [ant: implicit]
     2: in accordance with fact or the primary meaning of a term
        [syn: denotative]

Note the second definition in particular: in accordance with the primary
meaning of a term: the primary meaning of "class method" is that it
receives the class rather than the instance as first argument.

The "explicit is better than implicit" Zen should, in my opinion, be best
understood as a recommendation that code should, in general, avoid getting
input from context. In general, functions should avoid trying to decide 
which behaviour is wanted according to context or the environment:

def func(x):
    if running_in_a_terminal():
        print "The answer is", (x+1)/2
    else:
        printer = find_a_printer()
        if printer is not None:
            printer.send((x+1)/2, header="func(%r)"%x, footer="Page 1")
        else:
            # Try sending email to the current user, the default user,
            # postmaster or root in that order.
            msg = make_email("The answer is", (x+1)/2)
            for user in [get_current_user(), DEFAULT_USER, 
                         "root at localhost.localdomain", ...]:
                result = send_mail(msg, to=user)
                if result == 0: break
             else:
                # Fall back on beeping the speakers in Morse code
                ... 

(what if I want to beep the speakers from the terminal?), but not as a
prohibition against code like this:

def factorial(x):
    # Return the factorial of the integer part of x.
    n = int(x)
    if n <= 1: return 1
    return n*factorial(n-1)


There's no need to require the user to explicitly call int(x) before calling
factorial just to satisfy the Zen.

A function is free to process arguments as required, even to throw out
information (e.g. float -> int, instance -> class). What it shouldn't do is
*add* information implied by context (or at least, it should be very
cautious in doing so, and document it carefully, and preferably allow the
caller to easily override such implied data).


> Which one is which?  Is spam() the instance method and eggs() the
> class method, or is spam() the class method and eggs the instance
> method?  (One does not, and should not, have to *care*, which is
> kind of the point here. :-) )

You can't tell just from the syntax used to call them:

function(arg)
bound_method(arg)
builtin_function_or_method(arg)
callable_instance(arg)
type(arg)

all use the same syntax. There is no requirement that you should be able to
tell *everything* about a line of code just from the syntax used. If you
want to know whether black_knight.spam is an instance method or a class
method, or something else, use introspection to find out.

> By "that" I assume you mean the name "black_knight" here.  But the
> name is not required to make the call; see the last line of the
> following code fragment:
> 
>     funclist = []
>     ...
>     black_knight = K()
>     funclist.append(black_knight.spam)
>     funclist.append(black_knight.eggs)
>     ...
>     # At this point, let's say len(funclist) > 2,
>     # and some number of funclist[i] entries are ordinary
>     # functions that have no special first parameter.
>     random.choice(funclist)()

Irrelevant. The instance used for the bound method is explicitly specified
when you create it. But there's no requirement that you need to explicitly
specify the instance every single time you *use* the bound method. The
instance is part of the bound method, it isn't implied by context or
history or guessed from the environment.

Contrast what Python actually does with a hypothetical language where bound
methods' instances are implicitly assigned according to the most recent
instance created:

black_knight = Knight()
funclist.append(spam)  # refers to black_knight.spam
white_knight = Knight()
funclist.append(spam)  # refers to white_knight.spam
baldrick = Knave()
funclist.append(eggs)  # oops, Knaves don't have an eggs attribute



-- 
Steven



From haoxinfenshou98 at yahoo.com.cn  Tue Sep  6 01:51:43 2011
From: haoxinfenshou98 at yahoo.com.cn (shoestrade)
Date: Mon, 5 Sep 2011 22:51:43 -0700 (PDT)
Subject: When it comes to the Air Force
Message-ID: <ada66ba6-2af8-4f4e-b370-357e0a4103e7@a10g2000prn.googlegroups.com>

When it comes to the Air Force 1 {1}{/1}a lot of you might imagine
that it would be quite hard to continue improving and innovating on
the design of it, but leave it to Nike to surprise you at just about
every turn. Those of you that know Nike?s reputation know that they
always have new tricks hidden up their sleeves to keep t?
We well know that the Nike Air Force 1{2}{/2} is one of the most
versatile models that we have seen hosting a custom program called the
Nike Bespoke. Since the last pair of Nike Harajuku customs plus a
couple more designs done by different individuals, the AF1 has been
off the scene. Yet no worries because it ishttp://www.jordanshoesoutletnet.com/


From xyzhtml at 163.com  Tue Sep  6 01:57:31 2011
From: xyzhtml at 163.com (xyz)
Date: Tue, 6 Sep 2011 13:57:31 +0800
Subject: Floating point multiplication in python
Message-ID: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>

hi all:

As we know ,  1.1 * 1.1 is 1.21 . 
But in python ,I got following :

>>> 1.1 * 1.1
1.2100000000000002

why python get wrong result? Who can tell me  where's the 0.0000000000000002 from?


From clp2 at rebertia.com  Tue Sep  6 02:18:30 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 5 Sep 2011 23:18:30 -0700
Subject: Floating point multiplication in python
In-Reply-To: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
References: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
Message-ID: <CAMZYqRT5a+A-cqaTefQ5fBRr+gBMYcr4pWkUsi-q9ii9oNwO4Q@mail.gmail.com>

On Mon, Sep 5, 2011 at 10:57 PM, xyz <xyzhtml at 163.com> wrote:
> hi all:
>
> As we know , ?1.1 * 1.1 is 1.21 .
> But in python ,I got following :
>
>>>> 1.1 * 1.1
> 1.2100000000000002
>
> why python get wrong result?

It's not Python's fault per se, rather it's the inherent nature of
binary floating-point arithmetic. Try the equivalent in most other
languages and you'll get the same "error".
Please read http://docs.python.org/tutorial/floatingpoint.html

Cheers,
Chris


From jwiegley at gmail.com  Tue Sep  6 02:51:17 2011
From: jwiegley at gmail.com (John Wiegley)
Date: Tue, 06 Sep 2011 01:51:17 -0500
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <m24o0q410a.fsf@gmail.com>

>>>>> Jon Redgrave <jredgrave at capisco.com> writes:

> It seems unreasonably hard to write simple one-line unix command line
> filters in python:

> eg: ls | python -c "<something> print x.upper()"

[...]

> Is there a better solution - if not is this worth a PEP?

Have you looked at PyP (http://code.google.com/p/pyp)?

John


From gherron at islandtraining.com  Tue Sep  6 03:00:39 2011
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 06 Sep 2011 00:00:39 -0700
Subject: Floating point multiplication in python
In-Reply-To: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
References: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
Message-ID: <4E65C517.2080601@islandtraining.com>

On 09/05/2011 10:57 PM, xyz wrote:
> hi all:
>
> As we know ,  1.1 * 1.1 is 1.21 .
> But in python ,I got following :
>
>>>> 1.1 * 1.1
> 1.2100000000000002
>
> why python get wrong result? Who can tell me  where's the 0.0000000000000002 from?

It's not a python error    It's the nature of floating point arithmetic 
to be inaccurate on *ANY* computer.    Python just allows you to see the 
inaccuracies.

(But try:
   print 1.1*1.1
and see that the print statement does hide the roundoff error from you.)

Read this for more info:
     
http://pyfaq.infogami.com/why-are-floating-point-calculations-so-inaccurate



From steve+comp.lang.python at pearwood.info  Tue Sep  6 03:11:10 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 17:11:10 +1000
Subject: Floating point multiplication in python
References: <mailman.790.1315289581.27778.python-list@python.org>
Message-ID: <4e65c78f$0$29974$c3e8da3$5496439d@news.astraweb.com>

On Tue, 6 Sep 2011 03:57 pm xyz wrote:

> hi all:
> 
> As we know ,  1.1 * 1.1 is 1.21 .
> But in python ,I got following :
> 
>>>> 1.1 * 1.1
> 1.2100000000000002


The problem is that 1.1 is a *decimal* number, but computers use *binary*,
and it is impossible to express 1.1 exactly as a binary number. So when you
type 1.1 into nearly all computer languages, what you are actually getting
is a tiny bit more than 1.1:

>>> repr(1.1)
'1.1000000000000001'


which is the closest number to 1.1 that is possible using a C double
floating point number.

Normally you don't see it, because Python truncates the result when
printing:

>>> str(1.1)
'1.1'

but the difference is there.


-- 
Steven



From pierre.quentel at gmail.com  Tue Sep  6 03:18:16 2011
From: pierre.quentel at gmail.com (Pierre Quentel)
Date: Tue, 6 Sep 2011 00:18:16 -0700 (PDT)
Subject: Relative seeks on string IO
Message-ID: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>

Hi,

I am wondering why relative seeks fail on string IO in Python 3.2

Example :

    from io import StringIO
    txt = StringIO('Favourite Worst Nightmare')
    txt.seek(8) # no problem with absolute seek

but

    txt.seek(2,1) # 2 characters from current position

raises "IOError: Can't do nonzero cur-relative seeks" (tested with
Python3.2.2 on WindowsXP)

A seek relative to the end of the string IO raises the same IOError

However, it is not difficult to simulate a class that performs
relative seeks on strings :

====================
class FakeIO:

    def __init__(self,value):
        self.value = value
        self.pos = 0

    def read(self,nb=None):
        if nb is None:
            return self.value[self.pos:]
        else:
            return self.value[self.pos:self.pos+nb]

    def seek(self,offset,whence=0):
        if whence==0:
            self.pos = offset
        elif whence==1: # relative to current position
            self.pos += offset
        elif whence==2: # relative to end of string
            self.pos = len(self.value)+offset

txt = FakeIO('Favourite Worst Nightmare')
txt.seek(8)
txt.seek(2,1)
txt.seek(-8,2)
=====================

Is there any reason why relative seeks on string IO are not allowed in
Python3.2, or is it a bug that could be fixed in a next version ?

- Pierre


From __peter__ at web.de  Tue Sep  6 03:53:07 2011
From: __peter__ at web.de (Peter Otten)
Date: Tue, 06 Sep 2011 09:53:07 +0200
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <j44jh3$uo$1@solani.org>

Jon Redgrave wrote:

> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
> 
> eg: ls | python -c "<something>  print x.upper()"
> 
> to get at sys.stdin or similar needs an import, which makes a
> subsequent for-loop illegal.
> python -c "import sys; for x in sys.stdin(): print x" <<- SyntaxError
> 
> Am I missing something obvious?
> 
> The best I've come up with is to use sitecustomize.py to add to
> __builtin__
> def stdin():
>   import sys
>   for x in sys.stdin():
>     if not x: return
>     yield x.strip()
> import __builtin__
> __builtin__.stdin = stdin
> 
> This allows
> ls | python -c "for x in stdin(): print x.upper()"
> 
> Is there a better solution - if not is this worth a PEP?

$ touch alpha beta gamma omega
$ ls | python -c 'import sys; sys.stdout.writelines(s.upper() for s in 
sys.stdin if s.startswith(("a", "o")))'
ALPHA
OMEGA

If you are doing this a lot, why don't you write a helper script and invoke 
that? 

$ ls | pyfilter.py -f '"m" in line' -s 'lines = (line + line[::-1] for line 
in map(str.strip, lines))' -s'import re' -p 're.compile(r"(([a-
z])\2)").sub(lambda m: m.group(1).upper(), line)'
alphAAhpla
betAAteb
gaMMAAMMag
omegAAgemo

This relies on the convention that a single line of input is accessible as 
"line" and the complete input is called "lines". Of course the same can be 
done with python -c ..., -- and it is even more readable:

$ ls | python -c 'import re, sys
for line in sys.stdin:
>     line = line.strip()
>     line = line + line[::-1]
>     print re.compile(r"(([a-z])\2)").sub(lambda m: m.group(1).upper(), 
line)
> '
alphAAhpla
betAAteb
gaMMAAMMag
omegAAgemo

> Is there a better solution - if not is this worth a PEP?

The python interpreter could accept multiple -c arguments, but to see how 
this will be received a post on python-ideas should be sufficient.

For the sake of completeness here's the script I used to produce the example 
above:

$ cat pyfilter.py
#!/usr/bin/env python
import sys

def main():
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-s", "--setup",
        action="append", default=[],
        dest="setups", metavar="SETUP")
    parser.add_argument(
        "-f", "--filter",
        action="append", default=[],
        dest="filters", metavar="FILTER")
    parser.add_argument("-p", "--print", dest="format")

    args = parser.parse_args()
    lines = sys.stdin
    for setup in args.setups:
        exec setup
    for line in lines:
        line = line.rstrip("\n")
        for filter in args.filters:
            if not eval(filter):
                continue
        if args.format:
            line = eval(args.format)
        try:
            print line
        except IOError as e:
            if e.errno == 32: # broken pipe
                break
            raise
if __name__ == "__main__":
    main()


From 1248283536 at qq.com  Tue Sep  6 04:18:41 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 6 Sep 2011 16:18:41 +0800
Subject: strang thing:
Message-ID: <tencent_05A7597541D14E995173354F@qq.com>

i found stange thing that i can't solve
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()      
    for row in csv.reader(file):
                print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]

it's ok,
when i  add    (date,open,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
change the code into 
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()      
    for row in csv.reader(file):
            (date,open,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
            print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]


the wrong  output is :
    file = open(filename,'r')
TypeError: 'str' object is not callable

i don't know why??
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From rosuav at gmail.com  Tue Sep  6 04:22:37 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 6 Sep 2011 18:22:37 +1000
Subject: strang thing:
In-Reply-To: <tencent_05A7597541D14E995173354F@qq.com>
References: <tencent_05A7597541D14E995173354F@qq.com>
Message-ID: <CAPTjJmrJATNFPenVFpyhi0arPMzRMGXCw0dquRgyMfibaVibNw@mail.gmail.com>

2011/9/6 ???? <1248283536 at qq.com>:
> ??? file = open(filename,'r')

> when i? add??? (date,open,high,low,close,vol,adjclose) = (row[0], row[1],

You're assigning to the name "open", which is shadowing the built-in
of the same name. The second time through the loop, you're not calling
the usual open() function, you're trying to call your string. That's
what your error is telling you.

Hope that helps!

ChrisA


From wolfgang at rohdewald.de  Tue Sep  6 04:24:59 2011
From: wolfgang at rohdewald.de (Wolfgang Rohdewald)
Date: Tue, 6 Sep 2011 10:24:59 +0200
Subject: strang thing:
In-Reply-To: <tencent_05A7597541D14E995173354F@qq.com>
References: <tencent_05A7597541D14E995173354F@qq.com>
Message-ID: <201109061024.59596.wolfgang@rohdewald.de>

On Dienstag 06 September 2011, ???? wrote:
>             (date,open,high,low,close,vol,adjclose) = (row[0],
> row[1], row[2], row[3],row[4], row[5], row[6]) print  
> row[0], row[1], row[2], row[3],row[4], row[5], row[6]
> 
> 
> the wrong  output is :
>     file = open(filename,'r')
> TypeError: 'str' object is not callable

you reassigned "open" to be a string

-- 
Wolfgang


From duncan.booth at invalid.invalid  Tue Sep  6 04:30:53 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 6 Sep 2011 08:30:53 GMT
Subject: Floating point multiplication in python
References: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
	<mailman.792.1315292754.27778.python-list@python.org>
Message-ID: <Xns9F5860481F813duncanbooth@127.0.0.1>

Gary Herron <gherron at islandtraining.com> wrote:

> (But try:
>    print 1.1*1.1
> and see that the print statement does hide the roundoff error from you.)

That varies according to the version of Python you are using. On my system:

Python 2.7 (r27:82525, Jul  4 2010, 09:01:59) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> print(1.1*1.1)
1.21
>>> ^Z


C:\Python27>cd \python32

C:\Python32>python
Python 3.2.1 (default, Jul 10 2011, 21:51:15) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> print(1.1*1.1)
1.2100000000000002

-- 
Duncan Booth http://kupuguy.blogspot.com


From k.sahithi2862 at gmail.com  Tue Sep  6 05:20:38 2011
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Subject: SOUTH INDIAN HOT ACTRESS
Message-ID: <f78b9353-7cca-4227-b5e7-0a742a766070@x21g2000prd.googlegroups.com>

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From sinisa.segvic at fer.hr  Tue Sep  6 05:59:07 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Tue, 6 Sep 2011 02:59:07 -0700 (PDT)
Subject: Portable locale usage
Message-ID: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>

Hi,

I am musing on how to write portable Python3 code which would
take advantage of the standard locale module.

For instance, it would be very nice if we could say something like:

# does not work!
myISOCountryCode='hr'
locale.setlocale(locale.LC_ALL, (myISOCountryCode,
locale.getpreferredencoding()))

Up to now, I have found ways to set locale on Linux and Windows:

import locale
locale.setlocale(locale.LC_ALL, 'hr_HR.utf8')      # works on linux
locale.setlocale(locale.LC_ALL, 'hrv_HRV.1250') # works on windows

I have noticed that locale defines a dictionary locale.locale_alias,
and that it contains the following promising keys: 'hr_hr',
'hrvatski', 'hr'.
Unfortunately, both on Windows and Linux all these keys
are bound to the same outdated string 'hr_HR.ISO8859-2'.

My questions are the following:

1. Is there a way for writing portable Python code dealing with
locales
    (as sketched in the beginning)?

2. If not, is there anything wrong with that idea?

3. What is the status of locale.locale_alias (official documentation
does not mention it)?


Cheers,

Sinisa

http://www.zemris.fer.hr/~ssegvic/index_en.html


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Tue Sep  6 06:14:57 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Tue, 06 Sep 2011 12:14:57 +0200
Subject: Floating point multiplication in python
In-Reply-To: <mailman.790.1315289581.27778.python-list@python.org>
References: <mailman.790.1315289581.27778.python-list@python.org>
Message-ID: <j44rre$e4c$1@r03.glglgl.eu>

Am 06.09.2011 07:57 schrieb xyz:
> hi all:
>
> As we know ,  1.1 * 1.1 is 1.21 .
> But in python ,I got following :
>
>>>> 1.1 * 1.1
> 1.2100000000000002
>
> why python get wrong result? Who can tell me  where's the 0.0000000000000002 from?

1.1 does not fit in a binary floating point number. It is approximated - 
in binary! - as 1.000110011001100110011 ... (periodically).

Note that, while in the decimal system we normally use, only numbers 
which have other components in the denominator than 2 or 5 are 
periodically, in the binary systems only components with 2 are allowed 
in order not to be periodically.

Example: 3.453 is not periodically, because it is 3453/100 and 100 has 
only the factors 2 and 5, each twice.

1/3 = .3333333... is periodically, because it has the factor 3. The same 
applies to 1/6, which has 2 and 3 as factors. The latter destroys the 
non-periodical behaviour.

As said, in the dual system, only the 2 is allowed.

.5 (10) = 2** -1 = .1 (2).
.25 (10) = 2 ** -2 = .01 (2).
.75 (10) = their sum = .11 (2).

But .1 (1/10) is more complicated, -2 would be as well.

As the IEEE floating point representation is limited, there is a slight 
error value which makes the stored value differ from the intended one.

Look here:



>>> x=(1,0,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1)
>>> a=0
>>> for n,i in enumerate(x): a += i*2**-n; print a, a-1.1, i*2**-n, a-olda
...
1 -0.1 1 1
1.0 -0.1 0.0 0.0
1.0 -0.1 0.0 0.0
1.0 -0.1 0.0 0.0
1.0625 -0.0375 0.0625 0.0625
1.09375 -0.00625 0.03125 0.03125
1.09375 -0.00625 0.0 0.0
1.09375 -0.00625 0.0 0.0
1.09765625 -0.00234375 0.00390625 0.00390625
1.099609375 -0.000390625 0.001953125 0.001953125
1.099609375 -0.000390625 0.0 0.0
1.099609375 -0.000390625 0.0 0.0
1.09985351562 -0.000146484375 0.000244140625 0.000244140625
1.09997558594 -2.44140625001e-05 0.0001220703125 0.0001220703125
1.09997558594 -2.44140625001e-05 0.0 0.0
1.09997558594 -2.44140625001e-05 0.0 0.0
1.09999084473 -9.15527343759e-06 1.52587890625e-05 1.52587890625e-05
1.09999847412 -1.52587890634e-06 7.62939453125e-06 7.62939453125e-06
1.09999847412 -1.52587890634e-06 0.0 0.0
1.09999847412 -1.52587890634e-06 0.0 0.0
1.0999994278 -5.72204589933e-07 9.53674316406e-07 9.53674316406e-07
1.09999990463 -9.53674317294e-08 4.76837158203e-07 4.76837158203e-07
1.09999990463 -9.53674317294e-08 0.0 0.0
1.09999990463 -9.53674317294e-08 0.0 0.0
1.09999996424 -3.57627869541e-08 5.96046447754e-08 5.96046447754e-08
1.09999999404 -5.96046456636e-09 2.98023223877e-08 2.98023223877e-08
1.09999999404 -5.96046456636e-09 0.0 0.0
1.09999999404 -5.96046456636e-09 0.0 0.0
1.09999999776 -2.23517426789e-09 3.72529029846e-09 3.72529029846e-09
1.09999999963 -3.72529118664e-10 1.86264514923e-09 1.86264514923e-09
1.09999999963 -3.72529118664e-10 0.0 0.0
1.09999999963 -3.72529118664e-10 0.0 0.0
1.09999999986 -1.3969847501e-10 2.32830643654e-10 2.32830643654e-10
1.09999999998 -2.32831531832e-11 1.16415321827e-10 1.16415321827e-10
1.09999999998 -2.32831531832e-11 0.0 0.0
1.09999999998 -2.32831531832e-11 0.0 0.0
1.09999999999 -8.73123795486e-12 1.45519152284e-11 1.45519152284e-11
1.1 -1.45528034068e-12 7.27595761418e-12 7.27595761418e-12
1.1 -1.45528034068e-12 0.0 0.0
1.1 -1.45528034068e-12 0.0 0.0
1.1 -5.45785638906e-13 9.09494701773e-13 9.09494701773e-13
1.1 -9.10382880193e-14 4.54747350886e-13 4.54747350886e-13
1.1 -9.10382880193e-14 0.0 0.0
1.1 -9.10382880193e-14 0.0 0.0
1.1 -3.41948691585e-14 5.68434188608e-14 5.68434188608e-14
1.1 -5.77315972805e-15 2.84217094304e-14 2.84217094304e-14
1.1 -5.77315972805e-15 0.0 0.0
1.1 -5.77315972805e-15 0.0 0.0
1.1 -2.22044604925e-15 3.5527136788e-15 3.5527136788e-15
1.1 -4.4408920985e-16 1.7763568394e-15 1.7763568394e-15
1.1 -4.4408920985e-16 0.0 0.0
1.1 -4.4408920985e-16 0.0 0.0
1.1 -2.22044604925e-16 2.22044604925e-16 2.22044604925e-16
1.1 0.0 1.11022302463e-16 2.22044604925e-16
1.1 0.0 0.0 0.0
1.1 0.0 0.0 0.0
1.1 0.0 1.38777878078e-17 0.0
1.1 0.0 6.93889390391e-18 0.0

So here we have reached the point where the maximum precision is reached 
- a doesn't change anymore, although it should. The error is about 1E-16.

Now if you multiply two values with an error, the error also propagates 
into the result - PLUs the result can have its own error source - in the 
same order of magnitude.

(a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e 
or (2*a + e) * e.


From donstockbauer at hotmail.com  Tue Sep  6 06:46:38 2011
From: donstockbauer at hotmail.com (Don Stockbauer)
Date: Tue, 6 Sep 2011 03:46:38 -0700 (PDT)
Subject: When it comes to the Air Force
References: <ada66ba6-2af8-4f4e-b370-357e0a4103e7@a10g2000prn.googlegroups.com>
Message-ID: <a437e6a1-14c0-4c9b-91e6-bc2f655dba74@d2g2000vby.googlegroups.com>

On Sep 6, 12:51?am, shoestrade <haoxinfensho... at yahoo.com.cn> wrote:
> When it comes to the Air Force 1 {1}{/1}a lot of you might imagine
> that it would be quite hard to continue improving and innovating on
> the design of it, but leave it to Nike to surprise you at just about
> every turn. Those of you that know Nike?s reputation know that they
> always have new tricks hidden up their sleeves to keep t?
> We well know that the Nike Air Force 1{2}{/2} is one of the most
> versatile models that we have seen hosting a custom program called the
> Nike Bespoke. Since the last pair of Nike Harajuku customs plus a
> couple more designs done by different individuals, the AF1 has been
> off the scene. Yet no worries because it ishttp://www.jordanshoesoutletnet.com/

But how does the Air Force relate to Skynet?????


From hansmu at xs4all.nl  Tue Sep  6 07:15:10 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Tue, 06 Sep 2011 13:15:10 +0200
Subject: One line command line filter
In-Reply-To: <4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.782.1315261387.27778.python-list@python.org>
	<4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e6600be$0$2480$e4fe514c@news2.news.xs4all.nl>

On 6/09/11 01:18:37, Steven D'Aprano wrote:
> Terry Reedy wrote:
>
>> The doc says "-c<command>
>> Execute the Python code in command. command can be one or more
>> statements separated by newlines,"
>>
>> However, I have no idea how to put newlines into a command-line string.
>
> I imagine that it depends on the shell you are using, but bash on Linux
> makes it simple: double quotes "..." are like Python's triple-quoted
> strings in that they can include newlines.

Single quotes in bash are more similar to triple quotes in Python, in
that some shell syntax is recognized within double quoted string, but
not within single quoted strings:

$ python -c 'import sys
print `sys.version`'
'2.7.1 (r271:86882M, Nov 30 2010, 10:35:34) \n[GCC 4.2.1 (Apple Inc. 
build 5664)]'

$ python -c "import sys
 > print `sys.copyright`"
-bash: sys.copyright: command not found

When using single quotes, the `` are passed to Python, which interprets
them as a call to repr().  With double quotes, the shell interprets ``
as a sub-command.

> Other shells may be different.

Most *nix shells are similar to bash. The ones that are different
are csh and tcsh: they require a backslash before each newline:

$ tcsh
% ls f*.py | python -c 'import sys \
? print sys.stdin.read()'
filecmp.py
fileinput.py
fnmatch.py
formatter.py
fpformat.py
fractions.py
ftplib.py
functools.py
%

Sometimes you need two backslashes, one for csh and one for Python:

% python -c 'print "spam spam spam spam spam spam spam spam " \\
? "spam spam spam spam spam"'
spam spam spam spam spam spam spam spam spam spam spam spam spam
%

Hope this helps,

-- HansM






From t at jollybox.de  Tue Sep  6 07:16:50 2011
From: t at jollybox.de (Thomas Jollans)
Date: Tue, 06 Sep 2011 13:16:50 +0200
Subject: Portable locale usage
In-Reply-To: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
Message-ID: <4E660122.3000507@jollybox.de>

On 06/09/11 11:59, ssegvic wrote:
> Hi,
> 
> I am musing on how to write portable Python3 code which would
> take advantage of the standard locale module.
> 
> For instance, it would be very nice if we could say something like:
> 
> # does not work!
Doesn't it?

> myISOCountryCode='hr'

This is a language code. (there also happens to be a country code 'hr',
but you're referring to the Croatian language, 'hr')

> locale.setlocale(locale.LC_ALL, (myISOCountryCode,
> locale.getpreferredencoding()))

As far as I can tell, this does work. Can you show us a traceback?

> Up to now, I have found ways to set locale on Linux and Windows:
> 
> import locale
> locale.setlocale(locale.LC_ALL, 'hr_HR.utf8')      # works on linux
> locale.setlocale(locale.LC_ALL, 'hrv_HRV.1250') # works on windows
> 
> I have noticed that locale defines a dictionary locale.locale_alias,
> and that it contains the following promising keys: 'hr_hr',
> 'hrvatski', 'hr'.
> Unfortunately, both on Windows and Linux all these keys
> are bound to the same outdated string 'hr_HR.ISO8859-2'.

It looks like you don't actually care about the encoding: in your first
example, you use the default system encoding, which you do not control,
and in your second example, you're using two different encodings on the
two platforms. So why do you care whether or not the default uses ISO
8859-2 ?

> My questions are the following:
> 
> 1. Is there a way for writing portable Python code dealing with
> locales
>     (as sketched in the beginning)?
> 
> 2. If not, is there anything wrong with that idea?

As I said, I believe the above code should work. It works on my Linux
system.

What are you attempting to achieve with this setting of the locale,
without even setting the encoding? Doesn't it make more sense to simply
use the user's usual locale, and interact with them on their own terms?

> 3. What is the status of locale.locale_alias (official documentation
> does not mention it)?

I don't know, but I'd assume it's not considered part of the public API,
and you that shouldn't assume that it'll exist in future versions of Python.

Thomas


From bex.lewis at gmail.com  Tue Sep  6 07:46:20 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 6 Sep 2011 04:46:20 -0700 (PDT)
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
Message-ID: <f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>

On Sep 5, 3:51 pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
>
> Hi Becky,
>
> I tried it straight away:
> directory=D:\Webdav\
> directory=D:/Webdav/
>
> Didn't work, in both cases the same error "fshandler:get_data: \Webdav not
> found".
>
> I have the opinion that my WebDAV installation is at fault. The database is
> not created either.
> To have set up Python, I used python-2.7.2.msi.
> To install WebDAV, I used PyWebDAV-0.9.4.1 and PyXML-0.8.4 packages, both
> Unix/Linux.
> To install the, I used
> "
>
> >> You dont install from "Python GUI", use normal cmd, navigate to the
> >> folder
> >> you downloaded PyXML and PyWebDAV and run "python setup.py install"
> >> (python.exe has to be in your PATH). Then you have to find the
> >> startup-script "davserver". Find your python installation directory and
> >> look into<Install dir>/Tools/Scripts, in my computer this is
> >> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
> >> site-packages folder i.e. E:\python27\Lib/site-packages. You might have
> >> to
> >> look for "davserver" there..."
>
> Shall I re?nstall the whole lot? Would it make a difference if in that case
> I would use ActivePython-2.7.2.5-win32-x86.msi instead of python-2.7.2.msi?
>
> Fokke

You could try that but I'd imagine you'll end up with the same issue.
My best guess is that something is preventing os.path.isdir from
detecting the path as a directory under windows. I can't reproduce it
on my Linux system but may have a working windows installation later.
If I were you I'd fire up a python shell (execute python and get the
>>> prompt), import os.path and manually try os.path.isdir(path_name)
to try and find out what the actualy problem is.


From santosh.dumbre at gmail.com  Tue Sep  6 07:58:04 2011
From: santosh.dumbre at gmail.com (Santosh Dumbre)
Date: Tue, 6 Sep 2011 17:28:04 +0530
Subject: Beginner's query - What is scope of Python for Embedded
	Programming(C, C++) ?
Message-ID: <CAFr9_YS=DwbSgthL+mv2s=EkvGdKpP2AOQztHDZMWVNG5aunaw@mail.gmail.com>

Hi,

Please consider a beginner's query -

I am 9 -years experienced in C++.
Currently working in Automation domain.

Will Python help me to work in Automation/Embedded domain ?

Your advice is highly appreciated.

Please reply.

Thanks a lot,
Santosh.
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From bex.lewis at gmail.com  Tue Sep  6 08:01:33 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 6 Sep 2011 05:01:33 -0700 (PDT)
Subject: Running Python Demo on the Web?
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
Message-ID: <d002da6b-606a-4e17-a2e8-041fd7215ea1@y21g2000yqy.googlegroups.com>

On Sep 5, 11:00?pm, Python Fiddle Admin <pythonfid... at gmail.com>
wrote:
> Python has been ported to the web browser at pythonfiddle.com. Python
> Fiddle can import snippets of code that you are reading on a web page
> and run them in the browser. It supports a few popular libraries.
>
> Another common usage is to post code on the site to allow other people
> to play around with it. Also, it can be used to demonstrate a working
> program.

Looks interesting but you don't appear to have support for most (any?)
of the python core libs. Are you planning on adding more libraries?


From cjw at ncf.ca  Tue Sep  6 08:10:16 2011
From: cjw at ncf.ca (Colin J. Williams)
Date: Tue, 06 Sep 2011 08:10:16 -0400
Subject: Running Python Demo on the Web?
In-Reply-To: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
Message-ID: <j452jm$n8v$1@dough.gmane.org>

On 05-Sep-11 18:00 PM, Python Fiddle Admin wrote:
> Python has been ported to the web browser at pythonfiddle.com. Python
> Fiddle can import snippets of code that you are reading on a web page
> and run them in the browser. It supports a few popular libraries.
>
> Another common usage is to post code on the site to allow other people
> to play around with it. Also, it can be used to demonstrate a working
> program.
A neat idea.

import brian
dir(brian)

Responds "scipy not available"

Colin W.



From zdoor at xs4all.nl  Tue Sep  6 08:42:39 2011
From: zdoor at xs4all.nl (Alex van der Spek)
Date: Tue, 6 Sep 2011 08:42:39 -0400
Subject: HDF5 tree walker
Message-ID: <4e661540$0$2439$e4fe514c@news2.news.xs4all.nl>

Is there an equivalent to os.path.walk() for HDF5 file trees accessed 
through h5py?

Thanks!
Alex van der Spek 




From dreyemi at gmail.com  Tue Sep  6 09:02:24 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 6 Sep 2011 14:02:24 +0100
Subject: Python marks an instance of my class undefined
Message-ID: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>

Is there anything I need to do to create an instance of a class?

I have this simple code(The class is in a package core.fleet):

class Fleet(object):
    def __init__(self):
        """ no-arg constructor """
    def fleet_file_upload(self, filename, type=None):
        if type == 'user':
            return 'photos/%Y/%m/%d'
        return 'images'

    def fleet_get_fleet(self):
        """ Get all fleet """
        return db.db_get_fleet()

    def fleet_get_fleet_type(self):
        """ Get fleet by type or category """

For Python shell, I did this:

>>> import core.fleet
>>> f = Fleet()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
NameError: name 'Fleet' is not defined

What am I doing wrong?


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From vlastimil.brom at gmail.com  Tue Sep  6 09:13:17 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 6 Sep 2011 15:13:17 +0200
Subject: Portable locale usage
In-Reply-To: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
Message-ID: <CAHzaPEPLDYh4v0apnUSJnAtPw1ZUDd9uZL3+v6PS3aKuXJjzSA@mail.gmail.com>

2011/9/6 ssegvic <sinisa.segvic at fer.hr>:
> Hi,
>
> I am musing on how to write portable Python3 code which would
> take advantage of the standard locale module.
>
> For instance, it would be very nice if we could say something like:
>
> # does not work!
> myISOCountryCode='hr'
> locale.setlocale(locale.LC_ALL, (myISOCountryCode,
> locale.getpreferredencoding()))
>
> Up to now, I have found ways to set locale on Linux and Windows:
>
> import locale
> locale.setlocale(locale.LC_ALL, 'hr_HR.utf8') ? ? ?# works on linux
> locale.setlocale(locale.LC_ALL, 'hrv_HRV.1250') # works on windows
>
> I have noticed that locale defines a dictionary locale.locale_alias,
> and that it contains the following promising keys: 'hr_hr',
> 'hrvatski', 'hr'.
> Unfortunately, both on Windows and Linux all these keys
> are bound to the same outdated string 'hr_HR.ISO8859-2'.
>
> My questions are the following:
>
> 1. Is there a way for writing portable Python code dealing with
> locales
> ? ?(as sketched in the beginning)?
>
> 2. If not, is there anything wrong with that idea?
>
> 3. What is the status of locale.locale_alias (official documentation
> does not mention it)?
>
>
> Cheers,
>
> Sinisa
>
> http://www.zemris.fer.hr/~ssegvic/index_en.html
> --
> http://mail.python.org/mailman/listinfo/python-list
>

There may be some differences btween OSes end the versions, but using
python 2.7 and 3.2 on Win XP and Win7 (Czech)
I get the following results for setlocale:

>>> locale.setlocale(locale.LC_ALL,'Croatian')
'Croatian_Croatia.1250'
>>> locale.getlocale()
('Croatian_Croatia', '1250')
>>> locale.getpreferredencoding(do_setlocale=False)
'cp1250'
>>>

However, "hr" is not recognised on this systems:

>>> locale.setlocale(locale.LC_ALL, "hr")
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "locale.pyc", line 531, in setlocale
Error: unsupported locale setting
>>>

regards,
   vbr


From wxjmfauth at gmail.com  Tue Sep  6 09:37:51 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 6 Sep 2011 06:37:51 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
Message-ID: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>

This is just an attempt to put the
http://groups.google.com/group/comp.lang.python/browse_thread/thread/a008af1ac2968833#
discussion at a correct level.

With Python 2.7 a new float number representation (the David Gay's
algorithm)
has been introduced. If this is well honored in Python 2.7, it
seems to me, there are some missmatches in the Py3 series.

>>> sys.version
'2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit
(Intel)]'
>>> 0.1
0.10000000000000001
>>> print 0.1
0.1
>>> 1.1 * 1.1
1.2100000000000002
>>> print 1.1 * 1.1
1.21
>>> print repr(1.1 * 1.1)
1.2100000000000002
>>>


>>> sys.version
2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
>>>
>>> 0.1
0.1
>>> print 0.1
0.1
>>> 1.1 * 1.1
1.21
>>> print 1.1 * 1.1
1.21
>>> print repr(1.1 * 1.1)
1.2100000000000002
>>>


>>> sys.version
'3.1.4 (default, Jun 12 2011, 15:05:44) [MSC v.1500 32 bit (Intel)]'
>>> 0.1
0.1
>>> print(0.1)
0.1
>>> 1.1 * 1.1
1.2100000000000002
>>> print(1.1 * 1.1)
1.21
>>> print(repr(1.1 * 1.1))
1.2100000000000002
>>> '{:g}'.format(1.1 * 1.1)
'1.21'



>>> sys.version
'3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)]'
>>> 0.1
0.1
>>> print(0.1)
0.1
>>> 1.1 * 1.1
1.2100000000000002
>>> print (1.1 * 1.1)
1.2100000000000002
>>> print(repr((1.1 * 1.1)))
1.2100000000000002
>>>
>>> '{:g}'.format(1.1 * 1.1)
'1.21'
>>>

jmf


From dreyemi at gmail.com  Tue Sep  6 09:42:54 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 6 Sep 2011 14:42:54 +0100
Subject: Python marks an instance of my class undefined
In-Reply-To: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
Message-ID: <CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>

I was able to get this solved by calling class like this:

>>> from core.fleet import Fleet
>>> f = Fleet()

Thanks to a thread from the list titled "TypeError: 'module' object is not
callable"

On Tue, Sep 6, 2011 at 2:02 PM, Kayode Odeyemi <dreyemi at gmail.com> wrote:

> Is there anything I need to do to create an instance of a class?
>
> I have this simple code(The class is in a package core.fleet):
>
> class Fleet(object):
>     def __init__(self):
>         """ no-arg constructor """
>     def fleet_file_upload(self, filename, type=None):
>         if type == 'user':
>             return 'photos/%Y/%m/%d'
>         return 'images'
>
>     def fleet_get_fleet(self):
>         """ Get all fleet """
>         return db.db_get_fleet()
>
>      def fleet_get_fleet_type(self):
>         """ Get fleet by type or category """
>
> For Python shell, I did this:
>
> >>> import core.fleet
> >>> f = Fleet()
> Traceback (most recent call last):
>   File "<console>", line 1, in <module>
> NameError: name 'Fleet' is not defined
>
> What am I doing wrong?
>
>
> --
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>
>


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From gandalf at shopzeus.com  Tue Sep  6 10:18:32 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 06 Sep 2011 16:18:32 +0200
Subject: Python marks an instance of my class undefined
In-Reply-To: <CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
	<CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
Message-ID: <4E662BB8.6050102@shopzeus.com>

On 2011-09-06 15:42, Kayode Odeyemi wrote:
> I was able to get this solved by calling class like this:
>
> >>> from core.fleet import Fleet
> >>> f = Fleet()
>
> Thanks to a thread from the list titled "TypeError: 'module' object is 
> not callable"
Or you can also do this:

import core.fleet # import module core.fleet under the name core.fleet
f = core.fleet.Fleet()

Please note that the import statement imports the module with the given 
name.

So for example

import x.y.z

will import the name "x.y.z". Anything that is in module "z" will be 
available through its module, that is "x.y.z".
Whenever you use "import <name>", you have to access module contents 
through "<name>".

You can change the name:

import core.fleet as c # import module core.fleet under the name c
f = c.Fleet()



From dreyemi at gmail.com  Tue Sep  6 10:32:19 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 6 Sep 2011 15:32:19 +0100
Subject: Python marks an instance of my class undefined
In-Reply-To: <4E662BB8.6050102@shopzeus.com>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
	<CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
	<4E662BB8.6050102@shopzeus.com>
Message-ID: <CAPbrmCtmwvTY1hrtphn3uj07h_XAxPubSEOVQzgjijjfT0o+eA@mail.gmail.com>

On Tue, Sep 6, 2011 at 3:18 PM, Laszlo Nagy <gandalf at shopzeus.com> wrote:

> On 2011-09-06 15:42, Kayode Odeyemi wrote:
>
>> I was able to get this solved by calling class like this:
>>
>> >>> from core.fleet import Fleet
>> >>> f = Fleet()
>>
>> Thanks to a thread from the list titled "TypeError: 'module' object is not
>> callable"
>>
> Or you can also do this:
>
> import core.fleet # import module core.fleet under the name core.fleet
> f = core.fleet.Fleet()
>
> Please note that the import statement imports the module with the given
> name.
>
> So for example
>
> import x.y.z
>
> will import the name "x.y.z". Anything that is in module "z" will be
> available through its module, that is "x.y.z".
> Whenever you use "import <name>", you have to access module contents
> through "<name>".
>
> You can change the name:
>
> import core.fleet as c # import module core.fleet under the name c
> f = c.Fleet()
>
>
That is, import [package-name] .[class-name]

If using from, that can take the form of [package-name].[pymodule] import
[pymodule] or [class-name]

I just got to understand it.

Thanks. This explanation really simplifies it further.

Can I do:

from [pymodule] import [class-name], assuming the pymodule as a class
instance?



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From fnautaNO at SPAMsolfon.nl  Tue Sep  6 10:46:17 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Tue, 6 Sep 2011 16:46:17 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
	<f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>
Message-ID: <9cmq1vFk6fU1@mid.individual.net>

"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:f5b9ec16-de9a-4365-81a8-860dc27a985e at d25g2000yqh.googlegroups.com...
On Sep 5, 3:51 pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
>
> Hi Becky,
>
> I tried it straight away:
> directory=D:\Webdav\
> directory=D:/Webdav/
>
> Didn't work, in both cases the same error "fshandler:get_data: \Webdav not
> found".
>
> I have the opinion that my WebDAV installation is at fault. The database 
> is
> not created either.
> To have set up Python, I used python-2.7.2.msi.
> To install WebDAV, I used PyWebDAV-0.9.4.1 and PyXML-0.8.4 packages, both
> Unix/Linux.
> To install the, I used
> "
>
> >> You dont install from "Python GUI", use normal cmd, navigate to the
> >> folder
> >> you downloaded PyXML and PyWebDAV and run "python setup.py install"
> >> (python.exe has to be in your PATH). Then you have to find the
> >> startup-script "davserver". Find your python installation directory and
> >> look into<Install dir>/Tools/Scripts, in my computer this is
> >> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
> >> site-packages folder i.e. E:\python27\Lib/site-packages. You might have
> >> to
> >> look for "davserver" there..."
>
> Shall I re?nstall the whole lot? Would it make a difference if in that 
> case
> I would use ActivePython-2.7.2.5-win32-x86.msi instead of 
> python-2.7.2.msi?
>
> Fokke

You could try that but I'd imagine you'll end up with the same issue.
My best guess is that something is preventing os.path.isdir from
detecting the path as a directory under windows. I can't reproduce it
on my Linux system but may have a working windows installation later.
If I were you I'd fire up a python shell (execute python and get the
>>> prompt), import os.path and manually try os.path.isdir(path_name)
to try and find out what the actualy problem is.

I'm not familiar with Python, but I entered "import os.path " (nothing 
happened) and "os.path.isdir(path_name)
" in the shell. I guess what I did was not correct.
Underneath I copied what showed up in the shell.

-------------------------------------------
Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on 
win32
Type "copyright", "credits" or "license()" for more information.
>>> import os.path
>>> os.path.isdir(path_name)

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    os.path.isdir(path_name)
NameError: name 'path_name' is not defined
>>>
-------------------------------------------

Fokke 




From sinisa.segvic at fer.hr  Tue Sep  6 10:46:46 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Tue, 6 Sep 2011 07:46:46 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
Message-ID: <6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>

On 6 ruj, 13:16, Thomas Jollans <t... at jollybox.de> wrote:
> > locale.setlocale(locale.LC_ALL, (myISOCountryCode,
> > locale.getpreferredencoding()))
>
> As far as I can tell, this does work. Can you show us a traceback?

Sorry, I was imprecise.

I wanted to say that the above snippet
does not work both on Windows and Linux.

This is what I get on Windows:

>>> import sys
>>> sys.version
'3.2 (r32:88445, Feb 20 2011, 21:29:02) [MSC v.1500 32 bit (Intel)]'
>>> myISOCountryCode='hr'
>>> locale.setlocale(locale.LC_ALL, (myISOCountryCode, locale.getpreferredencoding()))
Traceback (most recent call last):
  File "<pyshell#113>", line 1, in <module>
    locale.setlocale(locale.LC_ALL, (myISOCountryCode,
locale.getpreferredencoding()))
  File "C:\apps\Python32\lib\locale.py", line 538, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

The snippet actually works on Linux, as you note.

> It looks like you don't actually care about the encoding: in your first
> example, you use the default system encoding, which you do not control,
> and in your second example, you're using two different encodings on the
> two platforms.

That's true.

That's because currently I care most about
lists of strings being sorted properly (see below).

Nevertheless, it *appears* to me that, in the Unicode era,
the locales could well be decoupled from particular encodings.
But this is another topic.

> So why do you care whether or not the default uses ISO 8859-2 ?

It's not that I care about encoding,
it's that Windows throws locale.Error at me :-)

> > My questions are the following:
>
> > 1. Is there a way for writing portable Python code dealing with
> > locales
> > ? ? (as sketched in the beginning)?
>
> > 2. If not, is there anything wrong with that idea?
>
> As I said, I believe the above code should work. It works on my Linux
> system.
>
> What are you attempting to achieve with this setting of the locale,
> without even setting the encoding? Doesn't it make more sense to simply
> use the user's usual locale, and interact with them on their own terms?

For the moment, I only wish to properly sort a Croatian text file
both on Windows and Linux (I am a cautious guy, I like reachable
goals).
When the locale is properly set, sorting works like a charm
with mylist.sort(key=locale.strxfrm).

My current solution to the portability problem is:

import locale
try:
  locale.setlocale(locale.LC_ALL, 'hr_HR.utf8')      # linux
except locale.Error:
  locale.setlocale(locale.LC_ALL, 'Croatian_Croatia.1250')    #
windows

Thanks for your feedback!

Sinisa


From hansmu at xs4all.nl  Tue Sep  6 11:12:59 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Tue, 06 Sep 2011 17:12:59 +0200
Subject: Python marks an instance of my class undefined
In-Reply-To: <mailman.802.1315318727.27778.python-list@python.org>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
	<CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
	<mailman.802.1315318727.27778.python-list@python.org>
Message-ID: <4e66387b$0$2499$e4fe514c@news2.news.xs4all.nl>

On 6/09/11 16:18:32, Laszlo Nagy wrote:
> On 2011-09-06 15:42, Kayode Odeyemi wrote:
>> I was able to get this solved by calling class like this:
>>
>> >>> from core.fleet import Fleet
>> >>> f = Fleet()
>>
>> Thanks to a thread from the list titled "TypeError: 'module' object is
>> not callable"
> Or you can also do this:
>
> import core.fleet # import module core.fleet under the name core.fleet
> f = core.fleet.Fleet()
>
> Please note that the import statement imports the module with the given
> name.
>
> So for example
>
> import x.y.z
>
> will import the name "x.y.z". Anything that is in module "z" will be
> available through its module, that is "x.y.z".
> Whenever you use "import <name>", you have to access module contents
> through "<name>".
>
> You can change the name:
>
> import core.fleet as c # import module core.fleet under the name c
> f = c.Fleet()

An import statement always imports a module, but Python also has the
from...import statement to import one item from a module:

from core.fleet import Fleet
f = Fleet()

The convention is to use the name "Fleet" (with an initial capital)
for the class and "fleet" (all lower case) for the module.  This
makes it easier to not confuse the class and the module.

Hope this helps,

-- HansM







From sinisa.segvic at fer.hr  Tue Sep  6 11:31:59 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Tue, 6 Sep 2011 08:31:59 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.800.1315314806.27778.python-list@python.org>
Message-ID: <13b9a70f-9e40-43a3-8198-0d84c8484fb8@z18g2000yqb.googlegroups.com>

On 6 ruj, 15:13, Vlastimil Brom <vlastimil.b... at gmail.com> wrote:

> There may be some differences btween OSes end the versions, but using
> python 2.7 and 3.2 on Win XP and Win7 (Czech)
> I get the following results for setlocale:
>
> >>> locale.setlocale(locale.LC_ALL,'Croatian')
>
> 'Croatian_Croatia.1250'>>> locale.getlocale()
>
> ('Croatian_Croatia', '1250')
>
> >>> locale.getpreferredencoding(do_setlocale=False)
> 'cp1250'
>
> However, "hr" is not recognised on this systems:
>
> >>> locale.setlocale(locale.LC_ALL, "hr")
>
> Traceback (most recent call last):
> ? File "<input>", line 1, in <module>
> ? File "locale.pyc", line 531, in setlocale
> Error: unsupported locale setting

Thanks for your feedback!


So this works only on Linux (in concordance with the documentation):

locale.setlocale(locale.LC_ALL, ('croatian',
locale.getpreferredencoding()))

And this works only on Windows (incomplete locale spec probably filled
in by Windows API):

locale.setlocale(locale.LC_ALL, 'croatian')


Obviously, there is a misunderstanding between Python
which uses standard (IANA) language codes
and Windows which, as usual, have their own ways :-(


One possible solution would be to change
locale.locale_alias on Windows so that
it honors the custom Windows conventions:
 'hr' -> 'Croatian_Croatia.1250'
   instead of
 'hr' -> 'hr_HR.ISO8859-2'

In addition, locale.getpreferredencoding()
should probably be changed in order to return
valid Windows encodings ('1250' instead of 'cp1250').

Cheers,

Sinisa


From t at jollybox.de  Tue Sep  6 11:53:37 2011
From: t at jollybox.de (Thomas Jollans)
Date: Tue, 06 Sep 2011 17:53:37 +0200
Subject: Portable locale usage
In-Reply-To: <6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
Message-ID: <4E664201.1010806@jollybox.de>

On 06/09/11 16:46, ssegvic wrote:
> For the moment, I only wish to properly sort a Croatian text file
> both on Windows and Linux (I am a cautious guy, I like reachable
> goals).
> When the locale is properly set, sorting works like a charm
> with mylist.sort(key=locale.strxfrm).

The problem with that is of course that a Croatian locale has to be
installed. Many Linux systems don't have locales that aren't used.


From PointedEars at web.de  Tue Sep  6 12:07:42 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Tue, 06 Sep 2011 18:07:42 +0200
Subject: Floating point multiplication in python
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu>
Message-ID: <2204592.egLE2XKegd@PointedEars.de>

Thomas Rachel wrote:

> Now if you multiply two values with an error, the error also propagates
> into the result - PLUs the result can have its own error source - in the
> same order of magnitude.
> 
> (a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e
> or (2*a + e) * e.

Your explanation about floating-point precision, which I already knew about 
but have only scanned here ? so it might be flawed as well ?, 
notwithstanding, it is not clear to me at all what you are trying to prove 
there.

Computers (well, perhaps outside of mathematical software) do NOT compute an 
equation as humans would do, so the binomial theorem does NOT apply.  In an 
algorithm of the real implementation,

  (a + e) * (a + e)

would be computed as follows:

  b := a + e
  c := b * b
    or
  c := b + ? + b

[add the value of `b' to the value of `b' (b?1) times, since binary logic 
does not support multiplication]

IOW, the error does propagate into the result indeed, but not as you 
described.  Indeed, thanks to rounding on assignment and multiplication
(i. e., setting register values or IEEE-754 floating-point mantissa and 
exponent), the error will be different, probably greater than you compute 
here.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From josepharmbruster at gmail.com  Tue Sep  6 12:17:19 2011
From: josepharmbruster at gmail.com (Joseph Armbruster)
Date: Tue, 6 Sep 2011 12:17:19 -0400
Subject: PEP 20 - Silly Question?
Message-ID: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>

I have used Python for some time and ran a windows build-bot for a bit.
 This morning, I told a fellow developer "There should be only one obvious
way to do it." and then I proceeded to forward him to the Zen of Python and
sent him a link to:
http://www.python.org/dev/peps/pep-0020/

I noticed that it says only 19 of 20 have been written down.  Which one was
not written down?

Thank You,
Joseph Armbruster
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From ericsnowcurrently at gmail.com  Tue Sep  6 12:26:05 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Tue, 6 Sep 2011 10:26:05 -0600
Subject: PEP 20 - Silly Question?
In-Reply-To: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
Message-ID: <CALFfu7D-rtSLhP0Q5Un5wgM2GqQqi2K5kqmuQZb-ytL_iHFojQ@mail.gmail.com>

On Tue, Sep 6, 2011 at 10:17 AM, Joseph Armbruster
<josepharmbruster at gmail.com> wrote:
> I have used Python for some time and ran a windows build-bot for a bit.
> ?This morning, I told a fellow developer "There should be only one obvious
> way to do it." and then I proceeded to forward him to the Zen of Python and
> sent him a link to:
> http://www.python.org/dev/peps/pep-0020/
> I noticed that it says only 19 of 20 have been written down. ?Which one was
> not written down?

I'm not sure there ever was a 20th.  Apparently Tim Peters was going
to leave the last one for Guido to fill in:

http://mail.python.org/pipermail/python-list/1999-June/616160.html

(from http://www.wefearchange.org/2010/06/import-this-and-zen-of-python.html)

-eric

> Thank You,
> Joseph Armbruster
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From schesis at gmail.com  Tue Sep  6 12:27:27 2011
From: schesis at gmail.com (Zero Piraeus)
Date: Tue, 6 Sep 2011 12:27:27 -0400
Subject: PEP 20 - Silly Question?
In-Reply-To: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
Message-ID: <CANaSqUdA4o6e+jJ3RFOyye0KcALpSZD_HQ_cobi9XnqLvu=auQ@mail.gmail.com>

:

On 6 September 2011 12:17, Joseph Armbruster <josepharmbruster at gmail.com> wrote:
> I noticed that it says only 19 of 20 have been written down. ?Which one was
> not written down?

The last one.

 -[]z.


From __peter__ at web.de  Tue Sep  6 12:54:42 2011
From: __peter__ at web.de (Peter Otten)
Date: Tue, 06 Sep 2011 18:54:42 +0200
Subject: PEP 20 - Silly Question?
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
Message-ID: <j45j8h$m5o$1@dough.gmane.org>

Joseph Armbruster wrote:

> I have used Python for some time and ran a windows build-bot for a bit.
>  This morning, I told a fellow developer "There should be only one obvious
> way to do it." and then I proceeded to forward him to the Zen of Python
> and sent him a link to:
> http://www.python.org/dev/peps/pep-0020/
> 
> I noticed that it says only 19 of 20 have been written down.  Which one
> was not written down?

Whoever offers a $1 billion sponsorship to the PSF gets to decide that one.
Expect something like "Keep your baby real dry with black whole diapers".



From Tim.Arnold at sas.com  Tue Sep  6 13:18:07 2011
From: Tim.Arnold at sas.com (Tim Arnold)
Date: Tue, 06 Sep 2011 13:18:07 -0400
Subject: sqlite3 with context manager
In-Reply-To: <7dbe35af-9cc7-42a8-9288-465e542b9ea6@glegroupsg2000goo.googlegroups.com>
References: <j3r859$rnt$1@foggy.unx.sas.com>
	<7dbe35af-9cc7-42a8-9288-465e542b9ea6@glegroupsg2000goo.googlegroups.com>
Message-ID: <j45kkf$b7o$1@foggy.unx.sas.com>

On 9/3/2011 3:03 AM, Carl Banks wrote:
> On Friday, September 2, 2011 11:43:53 AM UTC-7, Tim Arnold wrote:
>> Hi,
>> I'm using the 'with' context manager for a sqlite3 connection:
>>
>> with sqlite3.connect(my.database,timeout=10) as conn:
>>               conn.execute('update config_build set datetime=?,result=?
>> where id=?',
>>                                 (datetime.datetime.now(), success,
>> self.b['id']))
>>
>> my question is what happens if the update fails? Shouldn't it throw an
>> exception?
>
> If you look at the sqlite3 syntax documentation, you'll see it has a SQL extension that allows you to specify error semantics.  It looks something like this:
>
> UPDATE OR IGNORE
> UPDATE OR FAIL
> UPDATE OR ROLLBACK
>
> I'm not sure exactly how this interacts with pysqlite3, but using one of these might help it throw exceptions when you want it to.
>
>
> Carl Banks

I see now. You can use 'update or fail' if you have the extensions built 
in: http://docs.python.org/library/sqlite3.html#f1

example of use, line 76:
http://projects.developer.nokia.com/TECwidget/browser/data/montreal/updsqlite.py?rev=7ca2ebd301ed1eff0e2c28283470db060b872cd6

For my case, however, I'll follow Ian's advice and check on the rowcount 
after the update.

thanks for the explanation and advice,
--Tim


From xnews2 at fredp.lautre.net  Tue Sep  6 14:27:41 2011
From: xnews2 at fredp.lautre.net (Fred Pacquier)
Date: 06 Sep 2011 18:27:41 GMT
Subject: Advice on how to get started with 2D-plotting ?
Message-ID: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>

Hi,

I'm a Python long-timer, but I've never had to use tools like Matplotlib & 
others before.

Now, for my work, I would need to learn the basics fast, for a one-time 
quick-n-dirty job.

This involves a graphic comparison of RFC1918 IP subnets allocation across 
several networks.

The idea is to draw parallel lines, with segments (subnets) coloured green, 
yellow or red depending on the conflicts between the networks.

What would be the simplest/fastest way of getting this done ?
(the graphic parts, the IP stuff I know how to handle)

Alternately, if someone knows of a ready-made and accessible tool that does 
just that, I'm all ears :-)

TIA,
fp


From fnautaNO at SPAMsolfon.nl  Tue Sep  6 15:26:12 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Tue, 6 Sep 2011 21:26:12 +0200
Subject: Installing WebDAV server
References: <mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net>
	<mailman.809.1315328739.27778.python-list@python.org>
Message-ID: <9cnaekF5nfU1@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.809.1315328739.27778.python-list at python.org...
> On Tue, 6 Sep 2011 16:46:17 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>
>> -------------------------------------------
>> Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] 
>> on
>> win32
>> Type "copyright", "credits" or "license()" for more information.
>> >>> import os.path
>> >>> os.path.isdir(path_name)
>>
>> Traceback (most recent call last):
>>   File "<pyshell#1>", line 1, in <module>
>>     os.path.isdir(path_name)
>> NameError: name 'path_name' is not defined
>> >>>
>> -------------------------------------------
>>
> "path_name" is a placeholder -- you're supposed to put in the exact
> string(s) you have been trying in the configuration file (wrap the
> string in quotes).
>
>>>> import os.path
>>>> os.path.isdir("e:\webdav")
> False
>>>> os.mkdir("e:\webdav")
>>>> os.path.isdir("e:\webdav")
> True
>>>> os.path.isdir("e:\webdav\\")
> Traceback (  File "<interactive input>", line 1
>    os.path.isdir("e:\webdav\")
>                              ^
> SyntaxError: EOL while scanning single-quoted string
>>>> os.path.isdir("e:\webdav\\")
> True
>>>> os.path.isdir("e:\webdav/")
> True
>>>> os.path.isdir("e:/webdav/")
> True
>>>> os.path.isdir("e:/webdav")
> True
>>>> os.rmdir("e:/webdav")
>>>> os.path.isdir("e:\webdav")
> False
>>>>
>
> Note that Python itself (and the C-runtime) doesn't care if the
> separator is \ or / or even mixed; it is just the Windows command line
> that uses \ for separator and / for options. (Python, however, uses \ as
> an escape and \" is treated first, hence the need for \\" to escape the
> \ itself)

Thanks, this is clear.

This is my Python shell:

Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on 
win32
Type "copyright", "credits" or "license()" for more information.
>>> import os.path
>>> os.path.isdir("d:\webdav")
True
>>>

So Python recognizes the directory d:\webdav

This is the command shell:

D:\Python27\WebDAV\PyWebDAV\DAVServer>server.py -n -c config.ini

INFO:pywebdav:Starting up PyWebDAV server <version 0.9.4-dev>
INFO:pywebdav:chunked_http_response feature ON
INFO:pywebdav:http_request_use_iterator feature OFF
INFO:pywebdav :http_response_use_iterator feature OFF
INFO:fshandler:Initialized with D:/Webdav-http://10.0.0.140:8081/
WARNING:pywebdav:Authentication disabled!
INFO:pywebdav:Serving data from D:/Webdav
Listening on 10.0.0.140 <8081>

(here I try to login the WebDAV server with the local IE browser)

INFO:fshandler :get_data: D:\Webdav not found
server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0; 
Windows N
T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -
server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0; 
Windows N
T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -

So - I'm a bit lost now. Thinking seriously that my webdav installation is 
at fault.

Fokke





From bkasterm at gmail.com  Tue Sep  6 16:15:03 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Tue, 06 Sep 2011 14:15:03 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
Message-ID: <87obyx4ed4.fsf@gmail.com>


I build on the suggestion by rantingrick, but took it in a bit
different direction.

I now have working code that performs reasonable.  The reason for
the class lines (as opposed to just a function) is b/c font.measure
appears not that fast.  So I want to remember between different
calls to lines.count where the cutoff was, and then start looking
from there.  This one step of "optimization" was enough to make it
run reasonable on my system.

There are one important thing skipped, Tkinter.Label takes whitespace
into account.  This code does not yet.  Also I just hacked this
together as an example solution to work further from.

import Tkinter as Tk
import tkFont
import random
import sys

def genstr (j):
    rno = random.randint(4,50)
    ret_val = str(j) + ":"
    for i in range (0, rno):
        ret_val += "hello" + str(i)
    return ret_val

def gendata (lh):
    ret_val = []
    for i in range(0,lh):
        ret_val.append (genstr (i))
    return ret_val

data = gendata (100)

root = Tk.Tk()
font = tkFont.Font(family='times', size=13)

class lines:
    def __init__ (self):
        self.lastct = 1   # remember where the cutoff was last work from there

    def count (self, text, cutoff = 400):
        global font
        no_lines = 1
        start_idx = 0
        idx = self.lastct

        while True:
            if idx > len (text):
                idx = len (text)

            # shrink from guessed value
            while font.measure (text[start_idx:idx - 1]) > cutoff:
                if idx <= start_idx:
                    print "error"
                    sys.exit ()
                else:
                    idx -= 1
                    self.lastct = idx - start_idx # adjust since was too big

            # increase from guessed value (note: if first shrunk then done)
            while (idx < len (text)
                   and font.measure (text[start_idx:idx]) < cutoff):
                idx += 1
                self.lastct = idx - start_idx     # adjust since was too small

            # next line has been determined
            print "*" + text[start_idx:idx-1] + "*"
            if idx == len(text) and font.measure (text[start_idx:]) < cutoff:
                return no_lines
            elif idx == len(text):
                return no_lines + 1
            else:
                no_lines += 1
                start_idx = idx - 1
                idx = start_idx + self.lastct

lin = lines()

# for testing speed compute for all data
for i in range(0,len(data)):
    lin.count(data[i], 450)

# show only first 10
for i in range(0,min(len(data),10)):
    l = Tk.Label(root)
    l.pack()
    l['text'] = data[i]
    print i
    no = lin.count (data[i], 450)
    print "computed lines", no
    l['width'] = 50
    l['justify'] = Tk.LEFT
    l['anchor'] = 'w'
    l['wraplength'] = 450
    l['padx']=10
    l['pady'] = 5
    l['height'] = no
    l['font'] = font
    if i % 2 == 0:
        l['background'] = 'grey80'
    else:
        l['background'] = 'grey70'

root.mainloop()


From tjreedy at udel.edu  Tue Sep  6 16:49:19 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 06 Sep 2011 16:49:19 -0400
Subject: Relative seeks on string IO
In-Reply-To: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>
References: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>
Message-ID: <j46124$ujd$1@dough.gmane.org>

On 9/6/2011 3:18 AM, Pierre Quentel wrote:

> I am wondering why relative seeks fail on string IO in Python 3.2

Good question.

>      from io import StringIO
>      txt = StringIO('Favourite Worst Nightmare')
>      txt.seek(8) # no problem with absolute seek

Please post code without non-code indents, like so:

from io import StringIO
txt = StringIO('Favourite Worst Nightmare')
txt.seek(8,0) # no problem with absolute seek
txt.seek(0,1) #  0 characters from current position ok, and useless
txt.seek(-2,2) # end-relative gives error message for cur-relative

so someone can copy and paste without deleting indents.
I verified with 3.2.2 on Win7. I am curious what 2.7 and 3.1 do.

What system are you using? Does it have a narrow or wide unicode build? 
(IE, what is the value of sys.maxunicode?)

>      txt.seek(2,1) # 2 characters from current position
>
> raises "IOError: Can't do nonzero cur-relative seeks" (tested with
> Python3.2.2 on WindowsXP)
>
> A seek relative to the end of the string IO raises the same IOError

> Is there any reason why relative seeks on string IO are not allowed in
> Python3.2, or is it a bug that could be fixed in a next version ?

Since StringIO seeks by fixed-size code units (depending on the build), 
making seeking from the current position and end trivial, I consider 
this a behavior bug. At minimum, it is a doc bug. I opened
http://bugs.python.org/issue12922

As noted there, I suspect the limitation in inherited from TextIOBase. 
But I challenge that it should be.

I was somewhat surprised that seeking (from the start) is not limited to 
the existing text. Seeking past the end fills in with nulls. (They are 
typically a nuisance though.)

from io import StringIO
txt = StringIO('0123456789')
txt.seek(15,0) # no problem with absolute seek
txt.write('xxx')
s  = txt.getvalue()
print(ord(s[12]))
# 0
-- 
Terry Jan Reedy



From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Tue Sep  6 16:58:09 2011
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Tue, 6 Sep 2011 20:58:09 +0000 (UTC)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
Message-ID: <j461h0$nl2$1@speranza.aioe.org>

Thomas Jollans <t at jollybox.de> wrote:
 
> It looks like you don't actually care about the encoding: in your first
> example, you use the default system encoding, which you do not control,
> and in your second example, you're using two different encodings on the
> two platforms. So why do you care whether or not the default uses ISO
> 8859-2 ?
>

Maybe because using 8859-2 locale, (unicode) strings not representable in the
encodings will be sorted - how? 

I would care, I prefer not to have undefined behaviour.

-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From rantingrick at gmail.com  Tue Sep  6 16:59:41 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 13:59:41 -0700 (PDT)
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <27d7b2a8-1a24-4066-b603-13c935c42af1@fd21g2000vbb.googlegroups.com>

On Sep 6, 1:27?pm, Fred Pacquier <xne... at fredp.lautre.net> wrote:
> I'm a Python long-timer, but I've never had to use tools like Matplotlib &
> others before.
>
> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.

##################
## START SCRIPT ##
##################
#
# Easy_as.py
#
import Tkinter as tk
# Create a main window and a canvas.
app = tk.Tk()
can = tk.Canvas(
    app,
    width=500,
    height=500,
    #bd=1,
    #relief=tk.SOLID,
    )
can.pack(
    fill=tk.BOTH,
    expand=True,
    padx=5,
    pady=5,
    )
# Create some gridlines on the canvas.
W,H = 500, 500
row, col = 0,0
for _ in range(10):
    can.create_line(0, row, W, row, fill='red')
    print 0, row, W, row
    can.create_line(col, 0, col, H, fill='green')
    row += 50
    col += 50
can.create_line(
    0,500,300,300,
    350,200,400,450,
    fill='magenta',
    width=5,
    )
# Start the event loop.
app.mainloop()
################
## END SCRIPT ##
################

Any questions?


From rantingrick at gmail.com  Tue Sep  6 17:23:50 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 14:23:50 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
Message-ID: <8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>

Hmm, i can replace all that code with this...

#
# Easy_as.py
#
import Tkinter as tk
from ScrolledText import ScrolledText
import tkFont
import random
# Create some puesdo data.
data = [
    '{0}.{1}'.format(x, 'blah'*random.randint(4, 50))
    for x in range(100)
    ]
##print data
# Create the main window and a scrolled text widget.
root = tk.Tk()
font = tkFont.Font(family='times', size=13)
textbox = ScrolledText(
    root,
    width=60,
    height=20,
    font=('Times', 10),
    wrap=tk.WORD,
    )
textbox.pack(
    fill=tk.BOTH,
    expand=True,
    padx=5,
    pady=5,
    )
textbox.insert(1.0, '\n\n'.join(data))
# Start the event loop.
root.mainloop()
#
# End
#


From jabba.laci at gmail.com  Tue Sep  6 17:25:32 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Tue, 6 Sep 2011 17:25:32 -0400
Subject: import os or import os.path
Message-ID: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>

Hi,

If I want to use the 'os.path' module, it's enought to import 'os':

import os
if os.path.isfile('/usr/bin/bash'):
    print 'got it'

In other source codes I noticed that people write 'import os.path' in
this case. Which is better practice?

Thanks,

Laszlo


From rantingrick at gmail.com  Tue Sep  6 17:37:57 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 14:37:57 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
Message-ID: <d7f1b720-941c-4c29-92cc-94c1daa3e512@t3g2000vbe.googlegroups.com>

Or if you prefer the alternating background approach...


##################
# Easy_as.py
##################
import Tkinter as tk
from ScrolledText import ScrolledText
import tkFont
import random
END = 'end'
INSERT = 'insert'
#
# Create some puesdo data.
data = [
    '{0}.{1}'.format(x, 'blah'*random.randint(4, 50))
    for x in range(100)
    ]
##print data
#
# Create the main window and a scrolled text widget.
root = tk.Tk()
font = tkFont.Font(family='times', size=13)
textbox = ScrolledText(
    root,
    width=60,
    height=20,
    font=('Times', 10),
    wrap=tk.WORD,
    )
textbox.pack(
    fill=tk.BOTH,
    expand=True,
    padx=5,
    pady=5,
    )
#
# Add a tag to the very end of the widget and
# configure the tag only once!
textbox.tag_add('one', END)
textbox.tag_config('one', background='gray')
#
# Iterate over the lines stuffing them into the textbox.
idata = iter(data)
sidx = 1.0
while True:
    try:
        textbox.insert(END, idata.next()+"\n")
        textbox.tag_add('one', sidx, INSERT)
        textbox.insert(END, idata.next()+"\n")
        print sidx, textbox.index(END)
        sidx = textbox.index(INSERT)
    except StopIteration:
        break
#
# Start the event loop.
root.mainloop()
##################
# End
##################



From ian.g.kelly at gmail.com  Tue Sep  6 17:47:57 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Tue, 6 Sep 2011 15:47:57 -0600
Subject: import os or import os.path
In-Reply-To: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
References: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
Message-ID: <CALwzidnhfOPVPPzBqpc8P6WqwEE=QFmRufrnxf=vA2tnbThAJA@mail.gmail.com>

On Tue, Sep 6, 2011 at 3:25 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> If I want to use the 'os.path' module, it's enought to import 'os':
>
> import os
> if os.path.isfile('/usr/bin/bash'):
> ? ?print 'got it'
>
> In other source codes I noticed that people write 'import os.path' in
> this case. Which is better practice?

"import os.path" is better practice.  There is no guarantee in general
that the os module will automatically import os.path, and in future
versions or different implementations it might not.

Cheers,
Ian


From neubyr at gmail.com  Tue Sep  6 17:52:52 2011
From: neubyr at gmail.com (neubyr)
Date: Tue, 6 Sep 2011 16:52:52 -0500
Subject: MIMEText encode error - Python 2.6.6
Message-ID: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>

I am trying to write a program which can email file's content using
smtplib. I am getting following error while using Python 2.6.6
version.

{{{
File "./killed_jobs.py", line 88, in sendmail
   msg = MIMEText(ipfile.read, 'plain')
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/mime/text.py",
line 30, in __init__
   self.set_payload(_text, _charset)
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
line 224, in set_payload
   self.set_charset(charset)
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
line 266, in set_charset
   cte(self)
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/encoders.py",
line 73, in encode_7or8bit
   orig.encode('ascii')
AttributeError: 'builtin_function_or_method' object has no attribute 'encode'

}}}


I am referring to email examples on the doc site
http://docs.python.org/release/2.6.6/library/email-examples.html#email-examples
. Following is the msg object part in my code:

{{{
...
...
def sendmail(inputfile):
        ipfile = open(inputfile, 'r')
        msg = MIMEText(ipfile.read, 'plain')
        ipfile.close()

...
...
}}}

I have tried setting subtype and chartype separately as mentioned here
- http://docs.python.org/release/2.6.6/library/email.mime.html, but
the error remains same. Any help on what might be wrong here?

thanks,
neuby.r


From bkasterm at gmail.com  Tue Sep  6 18:00:51 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Tue, 06 Sep 2011 16:00:51 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
Message-ID: <87k49l49gs.fsf@gmail.com>

rantingrick <rantingrick at gmail.com> writes:

> Hmm, i can replace all that code with this...

Because I stupidly forgot to repeat the original problem I had, and my
code doesn't show it (and doesn't show the correct use of the function I
wrote).  The code shows that I now know how to compute the number of
lines and item will have; in the actual program I am developing I will
take the max of these numbers and make all items that height.

This means the code I should have shown is as follows (here I first
compute the maximum height needed for any item, and then show all items
using this height).  Also in the actual program there will be scrolling
options to change the item shown by the different labels.

import Tkinter as Tk
import tkFont
import random
import sys

def genstr (j):
    rno = random.randint(4,50)
    ret_val = str(j) + ":"
    for i in range (0, rno):
        ret_val += "hello" + str(i)
    return ret_val

def gendata (lh):
    ret_val = []
    for i in range(0,lh):
        ret_val.append (genstr (i))
    return ret_val

data = gendata (100)

root = Tk.Tk()
font = tkFont.Font(family='times', size=13)

class lines:
    def __init__ (self):
        self.lastct = 1   # remember where the cutoff was last work from there

    def count (self, text, cutoff = 400):
        global font
        no_lines = 1
        start_idx = 0
        idx = self.lastct

        while True:
            if idx > len (text):
                idx = len (text)

            # shrink from guessed value
            while font.measure (text[start_idx:idx - 1]) > cutoff:
                if idx <= start_idx:
                    print "error"
                    sys.exit ()
                else:
                    idx -= 1
                    self.lastct = idx - start_idx # adjust since was too big

            # increase from guessed value (note: if first shrunk then done)
            while (idx < len (text)
                   and font.measure (text[start_idx:idx]) < cutoff):
                idx += 1
                self.lastct = idx - start_idx     # adjust since was too small

            # next line has been determined
            print "*" + text[start_idx:idx-1] + "*"
            if idx == len(text) and font.measure (text[start_idx:]) < cutoff:
                return no_lines
            elif idx == len(text):
                return no_lines + 1
            else:
                no_lines += 1
                start_idx = idx - 1
                idx = start_idx + self.lastct

lin = lines()

max_ht = 0
for i in range(0,len(data)):
    ct = lin.count(data[i], 450)
    if ct > max_ht:
        max_ht = ct

for i in range(0,min(len(data),5)):
    l = Tk.Label(root)
    l.pack()
    l['text'] = data[i]
    l['width'] = 50
    l['justify'] = Tk.LEFT
    l['anchor'] = 'w'
    l['wraplength'] = 450
    l['padx']=10
    l['pady'] = 5
    l['height'] = max_ht
    l['font'] = font
    if i % 2 == 0:
        l['background'] = 'grey80'
    else:
        l['background'] = 'grey70'

root.mainloop()



>
> #
> # Easy_as.py
> #
> import Tkinter as tk
> from ScrolledText import ScrolledText
> import tkFont
> import random
> # Create some puesdo data.
> data = [
>     '{0}.{1}'.format(x, 'blah'*random.randint(4, 50))
>     for x in range(100)
>     ]
> ##print data
> # Create the main window and a scrolled text widget.
> root = tk.Tk()
> font = tkFont.Font(family='times', size=13)
> textbox = ScrolledText(
>     root,
>     width=60,
>     height=20,
>     font=('Times', 10),
>     wrap=tk.WORD,
>     )
> textbox.pack(
>     fill=tk.BOTH,
>     expand=True,
>     padx=5,
>     pady=5,
>     )
> textbox.insert(1.0, '\n\n'.join(data))
> # Start the event loop.
> root.mainloop()
> #
> # End
> #


From python at mrabarnett.plus.com  Tue Sep  6 18:05:20 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 06 Sep 2011 23:05:20 +0100
Subject: MIMEText encode error - Python 2.6.6
In-Reply-To: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>
References: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>
Message-ID: <4E669920.3010704@mrabarnett.plus.com>

On 06/09/2011 22:52, neubyr wrote:
> I am trying to write a program which can email file's content using
> smtplib. I am getting following error while using Python 2.6.6
> version.
>
> {{{
> File "./killed_jobs.py", line 88, in sendmail
>     msg = MIMEText(ipfile.read, 'plain')
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/mime/text.py",
> line 30, in __init__
>     self.set_payload(_text, _charset)
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
> line 224, in set_payload
>     self.set_charset(charset)
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
> line 266, in set_charset
>     cte(self)
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/encoders.py",
> line 73, in encode_7or8bit
>     orig.encode('ascii')
> AttributeError: 'builtin_function_or_method' object has no attribute 'encode'
>
> }}}
>
>
> I am referring to email examples on the doc site
> http://docs.python.org/release/2.6.6/library/email-examples.html#email-examples
> . Following is the msg object part in my code:
>
> {{{
> ...
> ...
> def sendmail(inputfile):
>          ipfile = open(inputfile, 'r')
>          msg = MIMEText(ipfile.read, 'plain')
>          ipfile.close()
>
> ...
> ...
> }}}
>
> I have tried setting subtype and chartype separately as mentioned here
> - http://docs.python.org/release/2.6.6/library/email.mime.html, but
> the error remains same. Any help on what might be wrong here?
>
The docs say:

     MIMEText(_text[, _subtype[, _charset]])

     ... _text is the string for the payload ...

You're passing ipfile.read, which is the read method of the file. You
should be passing the string returned by calling ipfile.read, ie
ipfile.read().


From rantingrick at gmail.com  Tue Sep  6 18:40:08 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 15:40:08 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
	<87k49l49gs.fsf@gmail.com>
Message-ID: <af467c29-d1c5-4a42-b1ec-91e0afba6819@d25g2000yqh.googlegroups.com>

On Sep 6, 5:00?pm, Bart Kastermans <bkast... at gmail.com> wrote:
> rantingrick <rantingr... at gmail.com> writes:
> > Hmm, i can replace all that code with this...
>
> Because I stupidly forgot to repeat the original problem I had, and my
> code doesn't show it (and doesn't show the correct use of the function I
> wrote).

Oh NOW i see! This new code you posted is like night and day compared
to the original </sarcasm> :o)

Anyway, i did not read the code to find the difference because i want
to know why you insist on using multiple labels for this when a
scrolled text will suffice. Are you trying to create some sort of
textual "animation frames" that you can flip through on demand? If not
i would use the scrolled text (and even the scrolled text can "feel"
like animation frames whist scrolling).

Take your input data and replace ALL single newlines with null strings
(thereby preserving paragraphs) and let the textbox control the line
wrapping. The benefits are enormous using my way; your way is limited
and requires re-inventing the wheel. Tell me WHY the textbox approach
is not a viable solution and THEN i'll listen to you.

Until then; you can lead a horse to water...



From rantingrick at gmail.com  Tue Sep  6 18:43:58 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 15:43:58 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
	<87k49l49gs.fsf@gmail.com>
	<af467c29-d1c5-4a42-b1ec-91e0afba6819@d25g2000yqh.googlegroups.com>
Message-ID: <700374dd-49ff-4f0a-8c22-198bff6b7b42@k15g2000yqd.googlegroups.com>

On Sep 6, 5:40?pm, rantingrick <rantingr... at gmail.com> wrote:
> On Sep 6, 5:00?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> Take your input data and replace ALL single newlines with null strings

CORRECTION: Take your input data and replace ALL single newlines with
A SINGLE SPACE


From bkasterm at gmail.com  Tue Sep  6 20:33:32 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Tue, 06 Sep 2011 18:33:32 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
	<87k49l49gs.fsf@gmail.com>
	<af467c29-d1c5-4a42-b1ec-91e0afba6819@d25g2000yqh.googlegroups.com>
Message-ID: <8762l5jin7.fsf@gmail.com>

rantingrick <rantingrick at gmail.com> writes:

> On Sep 6, 5:00?pm, Bart Kastermans <bkast... at gmail.com> wrote:
>> rantingrick <rantingr... at gmail.com> writes:
>> > Hmm, i can replace all that code with this...
>>
>> Because I stupidly forgot to repeat the original problem I had, and my
>> code doesn't show it (and doesn't show the correct use of the function I
>> wrote).
>
> Oh NOW i see! This new code you posted is like night and day compared
> to the original </sarcasm> :o)

Quite, I should know better (I deal with students thinking what is in
their mind should be clear to me all the time):


##############################################
# run through all the data we have, compute the maximum height
max_ht = 0
for i in range(0,len(data)):
    # lin.count is the line counting function
    ct = lin.count(data[i], 450)
    if ct > max_ht:
        max_ht = ct

for i in range(0,min(len(data),5)):
    # l is the Tkinter.Label with all formatting applied and data[i]
    # set for text
    l['height'] = max_ht    # use this maximum height for all Labels.

###############################################

Thinking on this some more, the first computation should surely be

max_ht = max (map (lambda x: lin.count(x, 450), data))


The second one could then be

labels = map (label_prepare_pack, data[:5])

where label_prepare_pack prepares (sets all attributes and data), packs,
and returns the new label.  The first (for max_ht) is a clear
improvement to me, the second (for labels) uses too many side-effects to
be very appealing to me.

> Anyway, i did not read the code to find the difference because i want
> to know why you insist on using multiple labels for this when a
> scrolled text will suffice. Are you trying to create some sort of
> textual "animation frames" that you can flip through on demand?

I don't follow precisely, but I am indeed looking to flip through all of
data while showing only 5 or 10 at a time.  The problem I wanted to
solve was that my window kept changing size while doing this.

> If not
> i would use the scrolled text (and even the scrolled text can "feel"
> like animation frames whist scrolling).
>
> Take your input data and replace ALL single newlines with null strings
> (thereby preserving paragraphs) and let the textbox control the line
> wrapping. The benefits are enormous using my way; your way is limited
> and requires re-inventing the wheel. Tell me WHY the textbox approach
> is not a viable solution and THEN i'll listen to you.

The reason I thought this, was that I didn't realize I could bind
actions to tags (to get different actions for different bits of text).
Now that I do know this I could use code like my lin.count to get the
maximum height still (to get a constant location for the i-th item as
the items are changed; more importantly to get a constant height for the
whole list of items), and then use tags to bind the corresponding
actions.

> Until then; you can lead a horse to water...

I certainly appreciate your trying.  I might not see the fresh stream
yet, but I do see liquid (possibly a shallow muddy pool, but big
progress from the dry sandy dunes before).  I will keep both approaches
in mind as I further develop.

Again, thanks for the help, greatly appreciated.


From ben+python at benfinney.id.au  Tue Sep  6 20:36:05 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 07 Sep 2011 10:36:05 +1000
Subject: PEP 20 - Silly Question?
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
Message-ID: <877h5lnq8a.fsf@benfinney.id.au>

Zero Piraeus <schesis at gmail.com> writes:

> On 6 September 2011 12:17, Joseph Armbruster <josepharmbruster at gmail.com> wrote:
> > I noticed that it says only 19 of 20 have been written down. ?Which
> > one was not written down?
>
> The last one.

I always thought it was the first one. Or the 6.25th one, I forget.

-- 
 \        ?When in doubt tell the truth. It will confound your enemies |
  `\   and astound your friends.? ?Mark Twain, _Following the Equator_ |
_o__)                                                                  |
Ben Finney


From nobody at nowhere.com  Tue Sep  6 21:01:11 2011
From: nobody at nowhere.com (Nobody)
Date: Wed, 07 Sep 2011 02:01:11 +0100
Subject: Can't use subprocess.Popen() after os.chroot() - why?
References: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>
Message-ID: <pan.2011.09.07.01.01.11.196000@nowhere.com>

On Sun, 04 Sep 2011 07:22:07 -0700, Erik wrote:

> I'm trying to do the following: 

> os.chroot("/tmp/my_chroot")
> p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)

> but the Popen call is dying with the following exception:

> LookupError: unknown encoding: string-escape
> 
> Am I missing something here? does the chroot environment need to be
> populated with more than just the date executable in this case?

Yes. It also needs to include any parts of the Python run-time which
Python will try to load while executing subsequent code. In this case, the
module which implements the string-escape encoding.

But fixing that will probably show up yet more files which need to exist
within the pseudo-root. E.g. any shared libraries which the executable
needs (probably at least libc), and any data files which those libraries
need (in the case of /bin/date, it may need /etc/timezone; many programs
may require locale data if you aren't in the "C" locale, and so on).

Whether from Python or from C, chroot() requires a good understanding of
the low-level details of your operating system. If you don't know how to
build a minimal Linux distribution from scratch, you're going to have to
learn many of those details in order to use chroot().

For any non-trivial chroot() usage, it's often easier to install a small
newlib+busybox-based Linux distribution under the pseudo-root than to try
to re-use files from and existing (presumably glibc+coreutils-based)
desktop/server distribution.



From skippy.hammond at gmail.com  Tue Sep  6 21:11:55 2011
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 07 Sep 2011 11:11:55 +1000
Subject: import os or import os.path
In-Reply-To: <CALwzidnhfOPVPPzBqpc8P6WqwEE=QFmRufrnxf=vA2tnbThAJA@mail.gmail.com>
References: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
	<CALwzidnhfOPVPPzBqpc8P6WqwEE=QFmRufrnxf=vA2tnbThAJA@mail.gmail.com>
Message-ID: <4E66C4DB.7080008@gmail.com>

On 7/09/2011 7:47 AM, Ian Kelly wrote:
> On Tue, Sep 6, 2011 at 3:25 PM, Jabba Laci<jabba.laci at gmail.com>  wrote:
>> Hi,
>>
>> If I want to use the 'os.path' module, it's enought to import 'os':
>>
>> import os
>> if os.path.isfile('/usr/bin/bash'):
>>     print 'got it'
>>
>> In other source codes I noticed that people write 'import os.path' in
>> this case. Which is better practice?
>
> "import os.path" is better practice.  There is no guarantee in general
> that the os module will automatically import os.path, and in future
> versions or different implementations it might not.

That's probably a matter of opinion - eg, 
http://docs.python.org/tutorial/interpreter.html has an example of 
importing the os module then accessing os.path.

Personally I think directly importing os.path is a waste of precious 
keystrokes ;)

Cheers,

Mark.


From python at mrabarnett.plus.com  Tue Sep  6 21:25:56 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 07 Sep 2011 02:25:56 +0100
Subject: PEP 20 - Silly Question?
In-Reply-To: <877h5lnq8a.fsf@benfinney.id.au>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
	<877h5lnq8a.fsf@benfinney.id.au>
Message-ID: <4E66C824.6010008@mrabarnett.plus.com>

On 07/09/2011 01:36, Ben Finney wrote:
> Zero Piraeus<schesis at gmail.com>  writes:
>
>> On 6 September 2011 12:17, Joseph Armbruster<josepharmbruster at gmail.com>  wrote:
>>> I noticed that it says only 19 of 20 have been written down.  Which
>>> one was not written down?
>>
>> The last one.
>
> I always thought it was the first one. Or the 6.25th one, I forget.
>
Or the zeroth one.


From milleja46 at gmail.com  Tue Sep  6 21:31:52 2011
From: milleja46 at gmail.com (Joshua Miller)
Date: Tue, 6 Sep 2011 21:31:52 -0400
Subject: PEP 20 - Silly Question?
In-Reply-To: <4E66C824.6010008@mrabarnett.plus.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
	<877h5lnq8a.fsf@benfinney.id.au>
	<4E66C824.6010008@mrabarnett.plus.com>
Message-ID: <CAKoEMEe9AFUkvn5W8GTHJs_bRO-e0dO9KJfC5HXRGyMad+PtvA@mail.gmail.com>

You sure it wasn't the invisible one? you know the one in the white
text that blends into the background?

On Tue, Sep 6, 2011 at 9:25 PM, MRAB <python at mrabarnett.plus.com> wrote:
> On 07/09/2011 01:36, Ben Finney wrote:
>>
>> Zero Piraeus<schesis at gmail.com> ?writes:
>>
>>> On 6 September 2011 12:17, Joseph Armbruster<josepharmbruster at gmail.com>
>>> ?wrote:
>>>>
>>>> I noticed that it says only 19 of 20 have been written down. ?Which
>>>> one was not written down?
>>>
>>> The last one.
>>
>> I always thought it was the first one. Or the 6.25th one, I forget.
>>
> Or the zeroth one.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tyler at tysdomain.com  Tue Sep  6 22:19:37 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Tue, 06 Sep 2011 20:19:37 -0600
Subject: Looking for open-source Python projects to help out with
Message-ID: <4E66D4B9.9050402@tysdomain.com>

Hello:
I've got a bit of time on my hands, so I'm curious what sorts of 
projects there are that people needs help with. I'd like to choose 
something that doesn't have a ton of red tape, but is stable, which is 
why I ask here instead of just Googling open source projects. My main 
interests lie in accessibility, Utilities and security.

-- 

Take care,
~Ty
Web: http://tds-solutions.net

Sent from my toaster.



From wolftracks at invalid.com  Tue Sep  6 22:43:23 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Tue, 06 Sep 2011 19:43:23 -0700
Subject: strange thing:
In-Reply-To: <mailman.794.1315297360.27778.python-list@python.org>
References: <tencent_05A7597541D14E995173354F@qq.com>
	<mailman.794.1315297360.27778.python-list@python.org>
Message-ID: <j46lpr$fb7$1@dont-email.me>

CA, Did you respond to my off-NG msg about FORTRAN? Perhaps it's caught 
in my spam on the net.


From rosuav at gmail.com  Tue Sep  6 22:48:21 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 7 Sep 2011 12:48:21 +1000
Subject: strange thing:
In-Reply-To: <j46lpr$fb7$1@dont-email.me>
References: <tencent_05A7597541D14E995173354F@qq.com>
	<mailman.794.1315297360.27778.python-list@python.org>
	<j46lpr$fb7$1@dont-email.me>
Message-ID: <CAPTjJmozE4SqUBKXg1TK9XQKQazqyX_fv2NkeMQ=uv-iYmnAsA@mail.gmail.com>

On Wed, Sep 7, 2011 at 12:43 PM, W. eWatson <wolftracks at invalid.com> wrote:
> CA, Did you respond to my off-NG msg about FORTRAN? Perhaps it's caught in
> my spam on the net.

No, I didn't; as someone else pointed out, you'll get better results
asking on a dedicated Fortran list.

ChrisA


From goon12 at gmail.com  Tue Sep  6 23:49:34 2011
From: goon12 at gmail.com (Joe Riopel)
Date: Tue, 6 Sep 2011 23:49:34 -0400
Subject: import os or import os.path
In-Reply-To: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
References: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
Message-ID: <CAHMX9+7khj4x0qe7H2ahO+2iPVPJRDs5ydXfd2XTDMPSyFYz7g@mail.gmail.com>

On Tue, Sep 6, 2011 at 5:25 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> If I want to use the 'os.path' module, it's enought to import 'os':
>
> import os
> if os.path.isfile('/usr/bin/bash'):
> ? ?print 'got it'
>
> In other source codes I noticed that people write 'import os.path' in
> this case. Which is better practice?

I just followed what the help said:

""
DESCRIPTION
    Instead of importing this module directly, import os and refer to
    this module as os.path.
""


From casevh at gmail.com  Tue Sep  6 23:58:29 2011
From: casevh at gmail.com (casevh)
Date: Tue, 6 Sep 2011 20:58:29 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
Message-ID: <6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>

On Sep 6, 6:37?am, jmfauth <wxjmfa... at gmail.com> wrote:
> This is just an attempt to put thehttp://groups.google.com/group/comp.lang.python/browse_thread/thread/...
> discussion at a correct level.
>
> With Python 2.7 a new float number representation (the David Gay's
> algorithm)
> has been introduced. If this is well honored in Python 2.7, it
> seems to me, there are some missmatches in the Py3 series.
>
> >>> sys.version
>
> '2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit
> (Intel)]'
>
> >>> 0.1
> 0.10000000000000001
> >>> print 0.1
> 0.1
> >>> 1.1 * 1.1
> 1.2100000000000002
> >>> print 1.1 * 1.1
> 1.21
> >>> print repr(1.1 * 1.1)
> 1.2100000000000002
>
> >>> sys.version
>
> 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
>
>
>
> >>> 0.1
> 0.1
> >>> print 0.1
> 0.1
> >>> 1.1 * 1.1
> 1.21
> >>> print 1.1 * 1.1
> 1.21
> >>> print repr(1.1 * 1.1)
> 1.2100000000000002
>

I tried this with the same version of Python and I get:

>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>> 1.1 * 1.1
1.2100000000000002
>>> print 1.1 * 1.1
1.21
>>> print repr(1.1 * 1.1)
1.2100000000000002
>>>

> >>> sys.version
>
> '3.1.4 (default, Jun 12 2011, 15:05:44) [MSC v.1500 32 bit (Intel)]'>>> 0.1
> 0.1
> >>> print(0.1)
> 0.1
> >>> 1.1 * 1.1
> 1.2100000000000002
> >>> print(1.1 * 1.1)
> 1.21
> >>> print(repr(1.1 * 1.1))
> 1.2100000000000002
> >>> '{:g}'.format(1.1 * 1.1)
>
> '1.21'
>
> >>> sys.version
>
> '3.2.2 (default, Sep ?4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)]'
>
> >>> 0.1
> 0.1
> >>> print(0.1)
> 0.1
> >>> 1.1 * 1.1
> 1.2100000000000002
> >>> print (1.1 * 1.1)
> 1.2100000000000002
> >>> print(repr((1.1 * 1.1)))
> 1.2100000000000002
>
> >>> '{:g}'.format(1.1 * 1.1)
> '1.21'
>

I get same results as you do for Python 3.1.4 and 3.2.2. IIRC, Python
3.2 changed (for floats) __str__ to call __repr__. That should explain
the difference between 3.1.4 and 3.2.2

Also note that 1.1 * 1.1 is not the same as 1.21.

>>> (1.1 * 1.1).as_integer_ratio()
(5449355549118301, 4503599627370496)
>>> (1.21).as_integer_ratio()
(1362338887279575, 1125899906842624)

This doesn't explain why 2.7.2 displayed a different result on your
computer. What do you get for as_integer_ratio() for (1.1 * 1.1) and
(1.21)?

casevh


> jmf



From steve+comp.lang.python at pearwood.info  Wed Sep  7 00:51:13 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 07 Sep 2011 14:51:13 +1000
Subject: Floating point multiplication in python
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu> <2204592.egLE2XKegd@PointedEars.de>
Message-ID: <4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>

On Wed, 7 Sep 2011 02:07 am Thomas 'PointedEars' Lahn wrote:

> Thomas Rachel wrote:
> 
>> Now if you multiply two values with an error, the error also propagates
>> into the result - PLUs the result can have its own error source - in the
>> same order of magnitude.
>> 
>> (a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e
>> or (2*a + e) * e.
> 
> Your explanation about floating-point precision, which I already knew
> about but have only scanned here ? so it might be flawed as well ?,
> notwithstanding, it is not clear to me at all what you are trying to prove
> there.
> 
> Computers (well, perhaps outside of mathematical software) do NOT compute
> an equation as humans would do, so the binomial theorem does NOT apply. 

I think you have misunderstood. The binomial theorem always applies. Any
time you multiply two numbers, both numbers can always be re-written as a
sum of two numbers:

10*5 = (6+4)*(2+3)

So a perfect square can always be re-written in the form where the binomial
theorem applies:

5*5 = (2+3)*(2+3)
25 = 2*2 + 2*3 + 3*2 + 3*3
25 = 4 + 6 + 6 + 9
25 = 25

The binomial theorem is not a part of the algorithm for performing
multiplication. It is part of the analysis of the errors that occur during
multiplication. The actual mechanics of how bits are flipped is irrelevant.

Any floating point number x should be considered as equal to (a+e), where a
is the number actually wanted by the user, and e the error term forced upon
the user by the use of binary floats. (If you're lucky, e=0.) Generally,
both a and e are unknown, but of course their sum is known -- it's just the
float x.

So given a float x, when you square it you get this:

Exact values: a*a = a**2

Float values: x*x = (a+e)(a+e)
                  = a**2 + 2*a*e + e**2

So the error term has increased from e to (2*a*e+e**2). It is usual to
assume that e**2 is small enough that it underflows to zero, so we have the
error term e increasing to 2*a*e as a fairly simple estimate of the new
error.


> In an algorithm of the real implementation,
> 
>   (a + e) * (a + e)
> 
> would be computed as follows:
> 
>   b := a + e
>   c := b * b
>     or
>   c := b + ? + b
> 
> [add the value of `b' to the value of `b' (b?1) times, since binary logic
> does not support multiplication]

What you probably mean to say is that binary hardware usually implements
multiplication via repeated addition.

http://en.wikipedia.org/wiki/Binary_multiplier

If you don't mean that, I can't imagine what you are trying to say.
Multiplication of numbers exists in any base, binary no less than decimal.


> IOW, the error does propagate into the result indeed, but not as you
> described.  Indeed, thanks to rounding on assignment and multiplication
> (i. e., setting register values or IEEE-754 floating-point mantissa and
> exponent), the error will be different, probably greater than you compute
> here.

There may be other sources of error, particularly when multiplying two
numbers of greatly different magnitudes, but that doesn't invalidate Thomas
Rachel's point (which is only an estimate, of course).

We can see how much error is actually there by using exact arithmetic:

Error in float 1.1:

>>> from fractions import Fraction as F
>>> >>> a = F(11, 10) 
>>> x = F.from_float(1.1)
>>> e = x - a
>>> print e
1/11258999068426240

Error in float 1.1*1.1:

>>> b = F(11, 10)**2
>>> y = F.from_float(1.1**2)
>>> f = y - b
>>> print f
21/112589990684262400

which is slightly more than double e above, and slightly less than our
estimate of 2*a*e = 11/56294995342131200

So we can conclude that, at least for 1.1**2, Python floats are more
accurate than we would expect from a simple application of the binomial
theorem. (For implementations using IEEE doubles.)


-- 
Steven



From wolftracks at invalid.com  Wed Sep  7 01:08:11 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Tue, 06 Sep 2011 22:08:11 -0700
Subject: strange thing:
In-Reply-To: <mailman.819.1315363703.27778.python-list@python.org>
References: <tencent_05A7597541D14E995173354F@qq.com>
	<mailman.794.1315297360.27778.python-list@python.org>
	<j46lpr$fb7$1@dont-email.me>
	<mailman.819.1315363703.27778.python-list@python.org>
Message-ID: <j46u9a$k0e$2@dont-email.me>

On 9/6/2011 7:48 PM, Chris Angelico wrote:
> On Wed, Sep 7, 2011 at 12:43 PM, W. eWatson<wolftracks at invalid.com>  wrote:
>> CA, Did you respond to my off-NG msg about FORTRAN? Perhaps it's caught in
>> my spam on the net.
>
> No, I didn't; as someone else pointed out, you'll get better results
> asking on a dedicated Fortran list.
>
> ChrisA
OK.


From cmpython at gmail.com  Wed Sep  7 01:56:10 2011
From: cmpython at gmail.com (CM)
Date: Tue, 6 Sep 2011 22:56:10 -0700 (PDT)
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <d0497b85-3c1f-41c9-92bf-788562815712@z18g2000yqb.googlegroups.com>

> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>
> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)

AFAIK, probably Matplotlib.  I'm not sure what
quite to imagine for your plot but below is code
that makes an attempt at (maybe) something like
you are describing, shown here:

http://www.flickr.com/photos/67254913 at N07/6123112552/in/photostream#/

There are smarter ways to do this in matplotlib, but
this is pretty quick and dirty.  I'm just plotting
lines over-top other lines.  The pic I put is the
plot as a .png, which matplotlib makes if you want,
but you can also view it in a frame that matplotlib
generates and then pan/zoom/etc...


from pylab import *

x = [1,2,3,4,5,6,7,8]
y = [2 for num in x]

#plot the parallel lines themselves in green
for num in range(6):
    y = [num for item in x]
    plot(x,y,color='g',lw='4')

#plot any conflict sections in red or yellow
#some hard data to give the idea:
x2 = [3,4]
y2 = [2 for num in x2]
x3 = [5,6,7]
y3 = [4 for num in x3]
x4 = [2,3]
y4 = [3 for num in x4]

#plot these three colored parts over the green lines
plot(x2,y2,color='r',lw='12')
plot(x3,y3,color='yellow',lw='12')
plot(x4,y4,color='r',lw='12')

pos = arange(6)
yticks(pos, ('net1', 'net2', 'net3', 'net4', 'net5', 'net6'))

show()

#-------------------------

Che


From cmpython at gmail.com  Wed Sep  7 02:00:58 2011
From: cmpython at gmail.com (CM)
Date: Tue, 6 Sep 2011 23:00:58 -0700 (PDT)
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <ee54313f-9875-4029-9ae0-02e807c1adf9@fe21g2000vbb.googlegroups.com>

On Sep 6, 2:27?pm, Fred Pacquier <xne... at fredp.lautre.net> wrote:
> Hi,
>
> I'm a Python long-timer, but I've never had to use tools like Matplotlib &
> others before.
>
> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>
> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)


> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>
> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)

One fairly simple way is with Matplotlib.  Not sure
what quite to imagine for your plot but below is code
that makes an attempt at (maybe) something like
you are describing, shown here:

http://www.flickr.com/photos/67254913 at N07/6123112552/in/photostream#/

There are fancier ways to do this in Matplotlib, but
this is pretty quick and dirty--I'm just plotting
lines over-top other lines.  The pic I put is the
plot as a .png, which matplotlib makes if you want,
but you can also view it in a frame that matplotlib
generates and then pan/zoom/etc... This is using the
pylab module, but you could also embed your plots in
a GUI if you prefer.


from pylab import *

#plot the parallel lines in green
x = [1,2,3,4,5,6,7,8]
y = [2 for num in x]
for num in range(6):
    y = [num for item in x]
    plot(x,y,color='g',lw='4')

#plot any conflict sections in red or yellow
#...some data to give the idea:
x2 = [3,4]
y2 = [2 for num in x2]
x3 = [5,6,7]
y3 = [4 for num in x3]
x4 = [2,3]
y4 = [3 for num in x4]

#plot three colored parts over the green lines
plot(x2,y2,color='r',lw='12')
plot(x3,y3,color='yellow',lw='12')
plot(x4,y4,color='r',lw='12')

#change y labels to meaningful labels
pos = arange(6)
yticks(pos, ('net1', 'net2', 'net3', 'net4', 'net5', 'net6'))

show()

#-------------------------

Che


From wxjmfauth at gmail.com  Wed Sep  7 02:32:07 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 6 Sep 2011 23:32:07 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
	<6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>
Message-ID: <6091df75-58e4-4316-8f3c-957b53c24490@dq7g2000vbb.googlegroups.com>

On 7 sep, 05:58, casevh <cas... at gmail.com> wrote:

> ...

>
> Also note that 1.1 * 1.1 is not the same as 1.21.
>
> >>> (1.1 * 1.1).as_integer_ratio()
>
> (5449355549118301, 4503599627370496)>>> (1.21).as_integer_ratio()
>
> (1362338887279575, 1125899906842624)
>
> This doesn't explain why 2.7.2 displayed a different result on your
> computer. What do you get for as_integer_ratio() for (1.1 * 1.1) and
> (1.21)?
>


Sure. I just picked up these numbers/expressions by chance. They
came to my mind following the previous discussion.

Sticking with the latest versions:


>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>> (1.1 * 1.1).as_integer_ratio()
(5449355549118301L, 4503599627370496L)
>>> (1.21).as_integer_ratio()
(1362338887279575L, 1125899906842624L)
>>>



>>> sys.version
'3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)]'
>>> (1.1 * 1.1).as_integer_ratio()
(5449355549118301, 4503599627370496)
>>> (1.21).as_integer_ratio()
(1362338887279575, 1125899906842624)
>>>


Has "long" not disappeared 2.7?
I have not the skill to dive into the machinery. I have
only some theroretical understanding and I'm a little bit
confused and have to face "there something strange
somewhere".

Test on Windows 7, 32 bits.


jmf



From mdickinson at enthought.com  Wed Sep  7 02:56:42 2011
From: mdickinson at enthought.com (Mark Dickinson)
Date: Tue, 6 Sep 2011 23:56:42 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
	<6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>
Message-ID: <6aec0187-2fa1-49ae-b2c0-fb0a10ec443c@br5g2000vbb.googlegroups.com>

On Sep 7, 4:58?am, casevh <cas... at gmail.com> wrote:
> IIRC, Python
> 3.2 changed (for floats) __str__ to call __repr__.

Yes, exactly:  str and repr of a float are identical in Python 3.2 +

I'm also puzzled by the

2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
[...]
>>> 1.1 * 1.1
1.21

in jmf's message.  Cut-and-paste typo?

--
Mark


From pierre.quentel at gmail.com  Wed Sep  7 03:00:24 2011
From: pierre.quentel at gmail.com (Pierre Quentel)
Date: Wed, 7 Sep 2011 00:00:24 -0700 (PDT)
Subject: Relative seeks on string IO
References: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>
	<mailman.810.1315342227.27778.python-list@python.org>
Message-ID: <30c6f7f0-b846-47a9-be49-e234a8bb8c16@e9g2000yqb.googlegroups.com>

>
> Please post code without non-code indents, like so:
>
Sorry about that. After the line "Example :" I indented the next
block, out of habit ;-)
>
> What system are you using? Does it have a narrow or wide unicode build?
> (IE, what is the value of sys.maxunicode?)
>
I use Windows XP Pro, version 2002, SP3. sys.maxunicode is 65535

I have the same behaviour with 3.1.1 and with 2.7

I don't understand why variable sized code units would cause problems.
On text file objects, read(nb) reads nb characters, regardless of the
number of bytes used to encode them, and tell() returns a position in
the text stream just after the next (unicode) character read

As for SringIO, a wrapper around file objects simulates a correct
behaviour for relative seeks :

====================
txt = "abcdef"
txt += "????? ??? ??????"
txt += "?????"
txt += "endof file"

out = open("test.txt","w",encoding="utf-8")
out.write(txt)
out.close()

fobj = open("test.txt",encoding="utf-8")
fobj.seek(3)
try:
    fobj.seek(2,1)
except IOError:
    print('raises IOError')

class _file:

    def __init__(self,file_obj):
        self.file_obj = file_obj

    def read(self,nb=None):
        if nb is None:
            return self.file_obj.read()
        else:
            return self.file_obj.read(nb)

    def seek(self,offset,whence=0):
        if whence==0:
            self.file_obj.seek(offset)
        else:
            if whence==2:
                # read till EOF
                while True:
                    buf = self.file_obj.read()
                    if not buf:
                        break
            self.file_obj.seek(self.file_obj.tell()+offset)

fobj = _file(open("test.txt",encoding="utf-8"))
fobj.seek(3)
fobj.seek(2,1)
fobj.seek(-5,2)
print(fobj.read(3))
==========================

- Pierre


From herbert.weinhandl at oeaw.ac.at  Wed Sep  7 03:14:57 2011
From: herbert.weinhandl at oeaw.ac.at (Weinhandl Herbert)
Date: Wed, 07 Sep 2011 09:14:57 +0200
Subject: Advice on how to get started with 2D-plotting ?
In-Reply-To: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <4e6719f1$0$38260$3b214f66@aconews.univie.ac.at>

Am 06.09.2011 20:27, schrieb Fred Pacquier:
> Hi,
>
> I'm a Python long-timer, but I've never had to use tools like Matplotlib&
> others before.
>
> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>

maybe networkx
   http://pypi.python.org/pypi/networkx/1.5
   http://networkx.lanl.gov/
is a better solution for your problem
or
http://pypi.python.org/pypi/graphcanvas/4.0.0

> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)
>
> Alternately, if someone knows of a ready-made and accessible tool that does
> just that, I'm all ears :-)
>
> TIA,
> fp

hth

Herbert


From Shambhu.Rajak at kpitcummins.com  Wed Sep  7 03:25:28 2011
From: Shambhu.Rajak at kpitcummins.com (Shambhu Rajak)
Date: Wed, 7 Sep 2011 07:25:28 +0000
Subject: Prequisites required to learn Django frame work
Message-ID: <408F64D89899604FB24015E64E10490C02F3F1@KCHJEXMB02.kpit.com>

Hi,
I have been doing python development since last year, I think I should learn the famous Django frame work.

Can any one suggest what are the perquisite required to setup django on my local home machine.
Please suggest something that does not require a separate server, as this is a personal interest of mine.

Thanks,
Shambhu

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From alec.taylor6 at gmail.com  Wed Sep  7 03:39:51 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 7 Sep 2011 17:39:51 +1000
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <4E66D4B9.9050402@tysdomain.com>
References: <4E66D4B9.9050402@tysdomain.com>
Message-ID: <CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>

Hi Tyler,

I'm currently working on building a new kind of social-network for
Users-Groups, Game-Clans & Student-Groups.

Building it using DJango with Pinax.

Detailed Feature-Set (planned):
? Event management
? Conference management (including ticketing with payment-gateway integration)
? Video+Audio Conferencing of event, with online interaction
possibilitiy (great for webinars)
? Join/create/delete/list groups
? Sitewide calendar
? Sitewide feed from non-private groups
? SSO integration (facebook, twitter & linkedin)
? Wall (+feed) for each group
? Listing of who's in which group
? PM group members

I will probably be releasing it under the New BSD license, although
I'm happy to consider others given a good argument.

Interested?

On Wed, Sep 7, 2011 at 12:19 PM, Littlefield, Tyler <tyler at tysdomain.com> wrote:
> Hello:
> I've got a bit of time on my hands, so I'm curious what sorts of projects
> there are that people needs help with. I'd like to choose something that
> doesn't have a ton of red tape, but is stable, which is why I ask here
> instead of just Googling open source projects. My main interests lie in
> accessibility, Utilities and security.
>
> --
>
> Take care,
> ~Ty
> Web: http://tds-solutions.net
>
> Sent from my toaster.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From wxjmfauth at gmail.com  Wed Sep  7 04:21:20 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Wed, 7 Sep 2011 01:21:20 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
	<6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>
	<6aec0187-2fa1-49ae-b2c0-fb0a10ec443c@br5g2000vbb.googlegroups.com>
Message-ID: <a371591e-f61d-42f2-92dc-ec670a8d78ee@l7g2000vbz.googlegroups.com>

On 7 sep, 08:56, Mark Dickinson <mdickin... at enthought.com> wrote:
> On Sep 7, 4:58?am, casevh <cas... at gmail.com> wrote:
>
> > IIRC, Python
> > 3.2 changed (for floats) __str__ to call __repr__.
>
> Yes, exactly: ?str and repr of a float are identical in Python 3.2 +
>
> I'm also puzzled by the
>
> 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
> [...]>>> 1.1 * 1.1
>
> 1.21
>
> in jmf's message. ?Cut-and-paste typo?
>
> --
> Mark


No. But, it's *my* mistake. I'm using a modified sys.displayhook which
uses a print statement (mainly for language reason). If forgot to
reset to the initial/default state for these tests when working
with too many opened interactive interpreters.
Sorry for the noise.


>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>>
>>> 1.1 * 1.1
1.21
>>> '?l?phant'
?l?phant
>>>
>>> sys.displayhook = sys.__displayhook__
>>> 1.1 * 1.1
1.2100000000000002
>>> '?l?phant'
'\xe9l\xe9phant'
>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>>

jmf


From fayaz.yusuf.khan at gmail.com  Wed Sep  7 04:32:48 2011
From: fayaz.yusuf.khan at gmail.com (Fayaz Yusuf Khan)
Date: Wed, 7 Sep 2011 14:02:48 +0530
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>
References: <4E66D4B9.9050402@tysdomain.com>
	<CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>
Message-ID: <201109071403.00915.fayaz@dexetra.com>

On Wednesday, September 07, 2011 01:09:51 PM Alec Taylor wrote:
> Hi Tyler,
> 
> I'm currently working on building a new kind of social-network for
> Users-Groups, Game-Clans & Student-Groups.
> 
> Building it using DJango with Pinax.
> 
> Detailed Feature-Set (planned):
> ? Event management
> ? Conference management (including ticketing with payment-gateway
> integration) ? Video+Audio Conferencing of event, with online interaction
> possibilitiy (great for webinars)
> ? Join/create/delete/list groups
> ? Sitewide calendar
> ? Sitewide feed from non-private groups
> ? SSO integration (facebook, twitter & linkedin)
> ? Wall (+feed) for each group
> ? Listing of who's in which group
> ? PM group members
> 
> I will probably be releasing it under the New BSD license, although
> I'm happy to consider others given a good argument.
> 
> Interested?
The project page and mailing list?

-- 
Fayaz Yusuf Khan
Cloud developer and designer
Dexetra SS, Kochi, India
fayaz.yusuf.khan_AT_gmail_DOT_com
fayaz_AT_dexetra_DOT_com
+91-9746-830-823
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From gelonida at gmail.com  Wed Sep  7 04:57:53 2011
From: gelonida at gmail.com (Gelonida N)
Date: Wed, 07 Sep 2011 10:57:53 +0200
Subject: Floating point multiplication in python
In-Reply-To: <4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.790.1315289581.27778.python-list@python.org>	<j44rre$e4c$1@r03.glglgl.eu>
	<2204592.egLE2XKegd@PointedEars.de>
	<4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j47bmi$65c$1@dough.gmane.org>

On 09/07/2011 06:51 AM, Steven D'Aprano wrote:
11258999068426240
> 
> Error in float 1.1*1.1:
> 
>>>> b = F(11, 10)**2
>>>> y = F.from_float(1.1**2)
>>>> f = y - b
>>>> print f
> 21/112589990684262400
> 
> which is slightly more than double e above, and slightly less than our
> estimate of 2*a*e = 11/56294995342131200
> 
> So we can conclude that, at least for 1.1**2, Python floats are more
> accurate than we would expect from a simple application of the binomial
> theorem. (For implementations using IEEE doubles.)


The reason why the error is different from the 2*a*e is, that we
encounter two problems.

first problem is, that x = a + e
e exists because a float does have a limited number (let's call it N) of
digits and a has an infinite amount of non zero digits in the binary format.


second problem is, that the result of the multiplication is not

(a+e) * (a+e) but a 'rounded' version of it, because the floating point
representation of the result would require about 2*N digits, whereas
only N digits will be stored in the result.

depending on the rounding which happened (up or down) the error will be
bigger or smaller than the estimated one.



From gelonida at gmail.com  Wed Sep  7 05:06:25 2011
From: gelonida at gmail.com (Gelonida N)
Date: Wed, 07 Sep 2011 11:06:25 +0200
Subject: Prequisites required to learn Django frame work
In-Reply-To: <408F64D89899604FB24015E64E10490C02F3F1@KCHJEXMB02.kpit.com>
References: <408F64D89899604FB24015E64E10490C02F3F1@KCHJEXMB02.kpit.com>
Message-ID: <j47c6i$9fg$1@dough.gmane.org>

Hi Shambhu,

On 09/07/2011 09:25 AM, Shambhu Rajak wrote:
> Hi,
> 
> I have been doing python development since last year, I think I should
> learn the famous Django frame work.
> 
>  
> 
> Can any one suggest what are the perquisite required to setup django on
> my local home machine.
> 

Just easyinstall django
This is enough for learning and midsize home grown projects not
requiring a very secure setup.

Django comes with a built in server, which is good enough for learning.
However It should not be used for deployment.

As database engine you can use sqlite3, which is also good enough for
learning.


My above mentioned setup will be working under windows and under linux.


If you want to have something with a better performance, then you have
two things to look at.

Change the data base engine to mysql or postgres.
  mysql / postgres should be installable under Windows

Use a real web server (apache / nginx with uwsgi plugins)
As an intermediate step you could instead of installing a 'real' web
server you could also use a python twisted server





From alec.taylor6 at gmail.com  Wed Sep  7 05:09:53 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 7 Sep 2011 19:09:53 +1000
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <201109071403.00915.fayaz@dexetra.com>
References: <4E66D4B9.9050402@tysdomain.com>
	<CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>
	<201109071403.00915.fayaz@dexetra.com>
Message-ID: <CAO+9iGckxCACkpCjwu-wMDfb32+wZ1463rUsBPqu2UOYy2NmiA@mail.gmail.com>

The project page is: http://SamuelMarks.GitHub.com/groupHub

/me is thinking a rename to "groupSwitch", thoughts?

The project is currently in planning stage. All help is appreciated.

On Wed, Sep 7, 2011 at 6:32 PM, Fayaz Yusuf Khan
<fayaz.yusuf.khan at gmail.com> wrote:
> On Wednesday, September 07, 2011 01:09:51 PM Alec Taylor wrote:
>> Hi Tyler,
>>
>> I'm currently working on building a new kind of social-network for
>> Users-Groups, Game-Clans & Student-Groups.
>>
>> Building it using DJango with Pinax.
>>
>> Detailed Feature-Set (planned):
>> ? Event management
>> ? Conference management (including ticketing with payment-gateway
>> integration) ? Video+Audio Conferencing of event, with online interaction
>> possibilitiy (great for webinars)
>> ? Join/create/delete/list groups
>> ? Sitewide calendar
>> ? Sitewide feed from non-private groups
>> ? SSO integration (facebook, twitter & linkedin)
>> ? Wall (+feed) for each group
>> ? Listing of who's in which group
>> ? PM group members
>>
>> I will probably be releasing it under the New BSD license, although
>> I'm happy to consider others given a good argument.
>>
>> Interested?
> The project page and mailing list?
>
> --
> Fayaz Yusuf Khan
> Cloud developer and designer
> Dexetra SS, Kochi, India
> fayaz.yusuf.khan_AT_gmail_DOT_com
> fayaz_AT_dexetra_DOT_com
> +91-9746-830-823
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From fnautaNO at SPAMsolfon.nl  Wed Sep  7 05:17:03 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Wed, 7 Sep 2011 11:17:03 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
Message-ID: <9cor4gFk15U1@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.823.1315377607.27778.python-list at python.org...
> On Tue, 6 Sep 2011 21:26:12 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>

<cut>

>> (here I try to login the WebDAV server with the local IE browser)
>>
>> INFO:fshandler :get_data: D:\Webdav not found
>
> At this point my best suggestion is to study the source code of
> fshandler to see what it is doing at this moment in time (offhand, is
> there any content IN the directory to be "served"?)

There is a file indeed, in d:\Webdav

>> server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0;
>> Windows N
>> T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -
>> server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0;
>> Windows N
>> T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -
>>
> That almost looks like something is trying to retrieve a default
> page for 404 (not found) page.
>
> To save you some time:
>
> -=-=-=-
>        if os.path.exists(path):
>            if os.path.isfile(path):
>                file_size = os.path.getsize(path)
>                if range == None:
> ## REST SNIPPED
>            else:
>                # also raise an error for collections
>                # don't know what should happen then..
>                log.info('get_data: %s not found' % path)

I have seen this part. Do I need to alter it?

> Note that at this point in the system, it is looking for a FILE, not
> a directory.
> -- 

I have re-installed Python and the setuptool, and tried the Python version 
of Active, but it did not make a difference.
So now I use the "old" Python 2.7 again. Used easy_install to install 
PyWebDAV. I now run davserver.exe from the Script directory. Still the same 
problem.
What I found, however, was that if I specify the directory from the command 
line (like davserver -D d:\Webdav -n) there is no error message as 
"INFO:fshandler :get_data: D:\Webdav not found". The browser shows still the 
404 error.
The error "INFO:fshandler :get_data: D:\Webdav not found" only occurs when I 
specify the "-c config.ini" in the command line.

I didn't expect it to be this so tricky. It looked easy to set up an 
experimental webdav server.

Fokke




From tjreedy at udel.edu  Wed Sep  7 05:37:32 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 07 Sep 2011 05:37:32 -0400
Subject: Floating point multiplication in python
In-Reply-To: <4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu> <2204592.egLE2XKegd@PointedEars.de>
	<4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j47e2h$km6$1@dough.gmane.org>

On 9/7/2011 12:51 AM, Steven D'Aprano wrote:

> So given a float x, when you square it you get this:
>
> Exact values: a*a = a**2
>
> Float values: x*x = (a+e)(a+e)
>                    = a**2 + 2*a*e + e**2
>
> So the error term has increased from e to (2*a*e+e**2). It is usual to
> assume that e**2 is small enough that it underflows to zero, so we have the
> error term e increasing to 2*a*e as a fairly simple estimate of the new
> error.

And the relative error, which is what is often important, increases from 
e/a to 2e/a.

-- 
Terry Jan Reedy



From bex.lewis at gmail.com  Wed Sep  7 06:31:35 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Wed, 7 Sep 2011 03:31:35 -0700 (PDT)
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
Message-ID: <d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>

> I have re-installed Python and the setuptool, and tried the Python version
> of Active, but it did not make a difference.
> So now I use the "old" Python 2.7 again. Used easy_install to install
> PyWebDAV. I now run davserver.exe from the Script directory. Still the same
> problem.
> What I found, however, was that if I specify the directory from the command
> line (like davserver -D d:\Webdav -n) there is no error message as
> "INFO:fshandler :get_data: D:\Webdav not found". The browser shows still the
> 404 error.
> The error "INFO:fshandler :get_data: D:\Webdav not found" only occurs when I
> specify the "-c config.ini" in the command line.
>
> I didn't expect it to be this so tricky. It looked easy to set up an
> experimental webdav server.
>
> Fokke

How are you trying to access the webdav server? I've been hacking on
the server for several days now (unrelated reasons) and have found
that it's a little unforgiving when it comes to configuration errors.
You need to be accessing the webdav server via the correct port (I
think it's 8008 by default). If you're not doing this and something
else is running on port 80 (which is where a webdav client will go to
by default) then this would explain the 404 errors.


From sinisa.segvic at fer.hr  Wed Sep  7 06:39:14 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Wed, 7 Sep 2011 03:39:14 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
	<mailman.804.1315324373.27778.python-list@python.org>
Message-ID: <2ecebe91-9d4d-4ce9-8e0a-2efbaf026273@l4g2000vbv.googlegroups.com>

On 6 ruj, 17:53, Thomas Jollans <t... at jollybox.de> wrote:
> On 06/09/11 16:46, ssegvic wrote:
>
> > For the moment, I only wish to properly sort a Croatian text file
> > both on Windows and Linux (I am a cautious guy, I like reachable
> > goals).
> > When the locale is properly set, sorting works like a charm
> > with mylist.sort(key=locale.strxfrm).
>
> The problem with that is of course that a Croatian locale has to be
> installed. Many Linux systems don't have locales that aren't used.

It appears we did not understand each other completely.

Python locales on Linux work as advertised,
I have no problems with locales on Linux whatsoever
(yes, the Croatian locale had to be manually installed).

On the other hand, it appears that
Python locales on Windows do not work as advertised.
Consider for instance my initial example:
  locale.setlocale(locale.LC_ALL, ('hr',
locale.getpreferredencoding()))
The code above does not work on Windows even though the fine manual
says:
http://docs.python.org/py3k/library/locale.html
'''
locale.setlocale(category, locale=None)
  ...
  If (the locale) is a tuple, it is converted to a string using the
locale aliasing engine.
  ...
'''
I do not believe my troubles could be solved by installing anything,
since the OS support for Croatian apperas to be present:
  locale.setlocale(locale.LC_ALL, 'Croatian_Croatia.1250')

To conclude, it seems to me that the Windows implementation
of the locale aliasing engine has some space for improvement.

All further comments shall be greatly appreciated :-)

Cheers,

Sinisa


From sinisa.segvic at fer.hr  Wed Sep  7 07:02:18 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Wed, 7 Sep 2011 04:02:18 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<j461h0$nl2$1@speranza.aioe.org>
Message-ID: <6b6671a8-8e92-4ace-a1ed-63e900246000@gz5g2000vbb.googlegroups.com>

On 6 ruj, 22:58, garabik-news-2005... at kassiopeia.juls.savba.sk wrote:
> Thomas Jollans <t... at jollybox.de> wrote:
> > It looks like you don't actually care about the encoding: in your first
> > example, you use the default system encoding, which you do not control,
> > and in your second example, you're using two different encodings on the
> > two platforms. So why do you care whether or not the default uses ISO
> > 8859-2 ?
>
> Maybe because using 8859-2 locale, (unicode) strings not representable in the
> encodings will be sorted - how?

Exactly.

Additionally, fonts supporting 8859-2 are scarce.
My favourite fonts were never available in 8859-2.

Sinisa


From sinisa.segvic at fer.hr  Wed Sep  7 07:17:52 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Wed, 7 Sep 2011 04:17:52 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
	<mailman.804.1315324373.27778.python-list@python.org>
Message-ID: <16cabd28-d195-4689-9a28-374671a030ba@gz5g2000vbb.googlegroups.com>

On 6 ruj, 17:53, Thomas Jollans <t... at jollybox.de> wrote:
> On 06/09/11 16:46, ssegvic wrote:
>
> > For the moment, I only wish to properly sort a Croatian text file
> > both on Windows and Linux (I am a cautious guy, I like reachable
> > goals).
> > When the locale is properly set, sorting works like a charm
> > with mylist.sort(key=locale.strxfrm).
>
> The problem with that is of course that a Croatian locale has to be
> installed. Many Linux systems don't have locales that aren't used.

I already concluded that on Linux there are no problems whatsoever
(the Croatian locale was kindly installed by the distribution setup).

Since my initial snippet does not work on Windows, I would conclude
that the locale aliasing engine on Windows should be improved.

Any opposing views will be appreciated :-)

For convenience, I repeat the snippet here:
import locale
locale.setlocale(locale.LC_ALL, ('hr', locale.getpreferredencoding()))

Cheers,

Sinisa


From mohammedimran107 at gmail.com  Wed Sep  7 08:49:57 2011
From: mohammedimran107 at gmail.com (mohammed imran)
Date: Wed, 7 Sep 2011 05:49:57 -0700 (PDT)
Subject: mohammedimran
Message-ID: <7d838612-c5a0-43d7-b852-4a84c35b183f@l4g2000vbz.googlegroups.com>

 http://123maza.com/65/fun564/


From t at jollybox.de  Wed Sep  7 09:15:53 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 07 Sep 2011 15:15:53 +0200
Subject: Portable locale usage
In-Reply-To: <2ecebe91-9d4d-4ce9-8e0a-2efbaf026273@l4g2000vbv.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
	<mailman.804.1315324373.27778.python-list@python.org>
	<2ecebe91-9d4d-4ce9-8e0a-2efbaf026273@l4g2000vbv.googlegroups.com>
Message-ID: <4E676E89.4010506@jollybox.de>

On 07/09/11 12:39, ssegvic wrote:
> On 6 ruj, 17:53, Thomas Jollans <t... at jollybox.de> wrote:
>> On 06/09/11 16:46, ssegvic wrote:
>>
>>> For the moment, I only wish to properly sort a Croatian text file
>>> both on Windows and Linux (I am a cautious guy, I like reachable
>>> goals).
>>> When the locale is properly set, sorting works like a charm
>>> with mylist.sort(key=locale.strxfrm).
>>
>> The problem with that is of course that a Croatian locale has to be
>> installed. Many Linux systems don't have locales that aren't used.
> 
> It appears we did not understand each other completely.

Yes we did. I was just pointing out that your code wouldn't be portable
to systems that don't have that specific locale.


From mohammedimran107 at gmail.com  Wed Sep  7 09:27:22 2011
From: mohammedimran107 at gmail.com (mohammed imran)
Date: Wed, 7 Sep 2011 06:27:22 -0700 (PDT)
Subject: mohammedimran
Message-ID: <43cb58c7-1b7b-4e61-a53a-7eb5603396ff@et6g2000vbb.googlegroups.com>

 http://123maza.com/65/fun564/


From t at jollybox.de  Wed Sep  7 09:45:30 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 07 Sep 2011 15:45:30 +0200
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <4E66D4B9.9050402@tysdomain.com>
References: <4E66D4B9.9050402@tysdomain.com>
Message-ID: <4E67757A.6070701@jollybox.de>

On 07/09/11 04:19, Littlefield, Tyler wrote:
> Hello:
> I've got a bit of time on my hands, so I'm curious what sorts of
> projects there are that people needs help with. I'd like to choose
> something that doesn't have a ton of red tape, but is stable, which is
> why I ask here instead of just Googling open source projects. My main
> interests lie in accessibility, Utilities and security.
> 

How about Python itself? Much of the standard library is written in
Python, and there are almost certainly bugs that need fixing.



From fnautaNO at SPAMsolfon.nl  Wed Sep  7 09:52:20 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Wed, 7 Sep 2011 15:52:20 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
	<d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>
Message-ID: <9cpbddFtidU1@mid.individual.net>

"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f at c29g2000yqd.googlegroups.com...
>> I have re-installed Python and the setuptool, and tried the Python 
>> version
>> of Active, but it did not make a difference.
>> So now I use the "old" Python 2.7 again. Used easy_install to install
>> PyWebDAV. I now run davserver.exe from the Script directory. Still the 
>> same
>> problem.
>> What I found, however, was that if I specify the directory from the 
>> command
>> line (like davserver -D d:\Webdav -n) there is no error message as
>> "INFO:fshandler :get_data: D:\Webdav not found". The browser shows still 
>> the
>> 404 error.
>> The error "INFO:fshandler :get_data: D:\Webdav not found" only occurs 
>> when I
>> specify the "-c config.ini" in the command line.
>>
>> I didn't expect it to be this so tricky. It looked easy to set up an
>> experimental webdav server.
>>
>> Fokke
>
> How are you trying to access the webdav server?

By IE 8 and Firefox, on the same system as well as on another system. 
Firefox doesn't show the 404 error but shows a blank screen.
I bound the davserver to the local adress of the system where it's on 
(10.0.0.140).
The port was 8081 but I changed it to 8008 as you said it's the default. No 
difference.

> I've been hacking on
> the server for several days now (unrelated reasons) and have found
> that it's a little unforgiving when it comes to configuration errors.
> You need to be accessing the webdav server via the correct port (I
> think it's 8008 by default). If you're not doing this and something
> else is running on port 80 (which is where a webdav client will go to
> by default) then this would explain the 404 errors.

I certainly use the correct IP address and port number.

Underneath is my command shell.
The 1st time I specified the config file (davserver.ini), the 2nd time I 
specified on the command line.
Here I logged in with Firefox from system XXX (replaced the name by XXX).

(Here I started the server with the the config file (davserver.ini)
D:Python27\Scripts>davserver -m -c davserver.ini
INFO:pywebdav:Starting up PyWebDAV server <version 0.9.4-dev>
INFO:pywebdav:chunked_http_response feature ON
INFO:pywebdav:http_request_use_iterator feature OFF
INFO:pywebdav:http_response_use_iterator feature OFF
INFO:DAVServer.fshandler:Initialized with d:\webdav-http://10.0.0.140:8081/
WARNING:pywebdav:Authentication disabled!
INFO:pywebdav:Serving data from d:\webdav
Listening on 10.0.0.140 <8081>

(browser logging in)

INFO:DAVServer.fshandler:get_data: d:\webdav not found
XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -

^C
D:\Python27\Scripts>INFO:pywebdav:Killed by user

(Here I started the server with command line options)
davserver -D d:\webdav -H 10.0.0.140 -P 8081 -n
WARNING:pywebdav:Authentication disabled!
Listening on 10.0.0.140 <8081>
XXX --- [07/Sep/2011 11:58:49] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
XXX --- [07/Sep/2011 11:58:54] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -

^C
D:\Python27\Scripts>INFO:pywebdav:Killed by user 




From d_vineet at yahoo.com  Wed Sep  7 09:58:26 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Wed, 7 Sep 2011 06:58:26 -0700 (PDT)
Subject: web2py
In-Reply-To: <mailman.3905.1315386400.27777.python-list@python.org>
References: <mailman.3905.1315386400.27777.python-list@python.org>
Message-ID: <1315403906.49408.YahooMailNeo@web160511.mail.bf1.yahoo.com>

>>>------------------------------------------
Hi,
I have been doing python development since last year, I think I should learn the famous Django frame work.
Can any one suggest what are the perquisite required to setup django on my local home machine.
Please suggest something that does not require a separate server, as this is a personal interest of mine. 
Thanks,
Shambhu
I'm currently working on building a new kind of social-network for
Users-Groups, Game-Clans & Student-Groups.
Building it using DJango with Pinax.
Detailed Feature-Set (planned):
? Event management
? Conference management (including ticketing with payment-gateway integration)
? Video+Audio Conferencing of event, with online interaction
possibilitiy (great for webinars)
? Join/create/delete/list groups
? Sitewide calendar
? Sitewide feed from non-private groups
? SSO integration (facebook, twitter & linkedin)
? Wall (+feed) for each group
? Listing of who's in which group
? PM group members
>>>------------------------------------------

I don't want to undermine django. It is a good framework.
But still, my advise would be to go for 'web2py'.
http://web2py.com/
It is simple yet powerful. Full stack MVC framework.
Low learning curve; simple syntax.
Good docs & community.
Everything works out of the box (including web-server, DAL, sqlite, etc)
No dependencies; plug&play.
etc. etc.
---Vineet
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From gandalf at shopzeus.com  Wed Sep  7 10:51:20 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Wed, 07 Sep 2011 16:51:20 +0200
Subject: Portable locale usage
In-Reply-To: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
Message-ID: <4E6784E8.2040206@shopzeus.com>


> 1. Is there a way for writing portable Python code dealing with
> locales
>      (as sketched in the beginning)?
I usually do this at the top of my main program, before importing other 
modules:

import locale
locale.setlocale(locale.LC_ALL, '')


This is absolutely portable. The above snippet works for different 
operating systems with different default encodings. You can always setup 
some environment variable before starting up the program if you really 
have to. And yes, that setting will be OS dependent, but your program 
will still be portable.

I have no access to Croatian Windows, but I bet that the above code 
would set the locale to the correct thing on both Linux and Windows.

It would be a bad idea to set the locale from anywhere else than your 
main program anyway. There are also some notes in the docs about this ( 
http://docs.python.org/library/locale.html#locale.setlocale ):

> setlocale() 
> <http://docs.python.org/library/locale.html#locale.setlocale> is not 
> thread-safe on most systems. Applications typically start with a call of
>
> import  locale
> locale.setlocale(locale.LC_ALL,  '')
>
> This sets the locale for all categories to the user's default setting 
> (typically specified in the *LANG* environment variable). If the 
> locale is not changed thereafter, using multithreading should not 
> cause problems.
>

Why are you trying to force a specific locale to your program anyway?

   L


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From ericsnowcurrently at gmail.com  Wed Sep  7 11:12:20 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Wed, 7 Sep 2011 09:12:20 -0600
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <4E66D4B9.9050402@tysdomain.com>
References: <4E66D4B9.9050402@tysdomain.com>
Message-ID: <CALFfu7DeQKRBq-Ta3OBpG9nXF23WWeKwPBCne+_sUPR_bJKSiw@mail.gmail.com>

On Tue, Sep 6, 2011 at 8:19 PM, Littlefield, Tyler <tyler at tysdomain.com> wrote:
> Hello:
> I've got a bit of time on my hands, so I'm curious what sorts of projects
> there are that people needs help with. I'd like to choose something that
> doesn't have a ton of red tape, but is stable, which is why I ask here
> instead of just Googling open source projects. My main interests lie in
> accessibility, Utilities and security.

An interesting one that I haven't had time to help on yet is the
"extensions for unittest" project:

https://code.google.com/p/unittest-ext/issues/list

Basically it's adding an extensions framework to the stdlib unittest
module.  I'm sure Michael Foord wouldn't mind the help.  Like I said,
a very interesting project, though not directly related to
accessibility or security.

-eric

>
> --
>
> Take care,
> ~Ty
> Web: http://tds-solutions.net
>
> Sent from my toaster.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From bclark76 at gmail.com  Wed Sep  7 11:56:32 2011
From: bclark76 at gmail.com (bclark76)
Date: Wed, 7 Sep 2011 08:56:32 -0700 (PDT)
Subject: How to structure packages
Message-ID: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>

I'm learning python, and was playing with structuring packages.

Basically I want to have a package called mypackage that defines a
number of classes and functions.


so I create:

mypackage
    __init__.py
    myfunc.py
    MyClass.py


my __init__.py is blank.

my MyClass.py looks like:

import blah

class MyClass(blahblah):
    blah
    blah
    blah


then I have a run.py that looks like

from mypackage import MyClass


x = MyClass()


This doesn't work because MyClass is mypackage.MyClass.MyClass.
There's this MyClass module 'in the way'.


I'm trying to follow the rule that every file defines only one class.
I could define MyClass in __init__.py, but then what if I wanted to
define more classes in the mypackage package? My one class per file
rule goes out the window.

Is this rule wrongheaded, or is there another way to do this?


Thanks.



From alec.taylor6 at gmail.com  Wed Sep  7 12:09:41 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 8 Sep 2011 02:09:41 +1000
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <CALFfu7DeQKRBq-Ta3OBpG9nXF23WWeKwPBCne+_sUPR_bJKSiw@mail.gmail.com>
References: <4E66D4B9.9050402@tysdomain.com>
	<CALFfu7DeQKRBq-Ta3OBpG9nXF23WWeKwPBCne+_sUPR_bJKSiw@mail.gmail.com>
Message-ID: <CAO+9iGdaezjnO+V7Pgvw4CRdybqkPQJGSX3t-L8NpbN1s_7Wqw@mail.gmail.com>

Accessibility?

Hmm, you could look at
http://groups.google.com/group/django-users/browse_thread/thread/44a4dbf8771e0f4f
(https://groups.google.com/forum/#!topic/django-users/RKTb-HceD08)

On Thu, Sep 8, 2011 at 1:12 AM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
> On Tue, Sep 6, 2011 at 8:19 PM, Littlefield, Tyler <tyler at tysdomain.com> wrote:
>> Hello:
>> I've got a bit of time on my hands, so I'm curious what sorts of projects
>> there are that people needs help with. I'd like to choose something that
>> doesn't have a ton of red tape, but is stable, which is why I ask here
>> instead of just Googling open source projects. My main interests lie in
>> accessibility, Utilities and security.
>
> An interesting one that I haven't had time to help on yet is the
> "extensions for unittest" project:
>
> https://code.google.com/p/unittest-ext/issues/list
>
> Basically it's adding an extensions framework to the stdlib unittest
> module. ?I'm sure Michael Foord wouldn't mind the help. ?Like I said,
> a very interesting project, though not directly related to
> accessibility or security.
>
> -eric
>
>>
>> --
>>
>> Take care,
>> ~Ty
>> Web: http://tds-solutions.net
>>
>> Sent from my toaster.
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From gordon at panix.com  Wed Sep  7 12:11:11 2011
From: gordon at panix.com (John Gordon)
Date: Wed, 7 Sep 2011 16:11:11 +0000 (UTC)
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <j4852v$q77$1@reader1.panix.com>

In <2a4f542c-a8c1-46c7-9899-a3fad0940cf6 at x11g2000yqc.googlegroups.com> bclark76 <bclark76 at gmail.com> writes:

> mypackage
>     __init__.py
>     myfunc.py
>     MyClass.py

> from mypackage import MyClass

Try this instead:

  from mypackage.MyClass import MyClass

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From rafadurancastaneda at gmail.com  Wed Sep  7 13:18:43 2011
From: rafadurancastaneda at gmail.com (=?ISO-8859-1?Q?Rafael_Dur=E1n_Casta=F1eda?=)
Date: Wed, 07 Sep 2011 19:18:43 +0200
Subject: How to structure packages
In-Reply-To: <j4852v$q77$1@reader1.panix.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<j4852v$q77$1@reader1.panix.com>
Message-ID: <4E67A773.6070304@gmail.com>

Check python pep8: http://www.python.org/dev/peps/pep-0008/

And you will see than you shouldn't named modules as you did, so you 
should do something like:

mypackage
     __init__.py
     mymodule
     ...

mypackage.mymodule.MyClass

On 07/09/11 18:11, John Gordon wrote:
> In<2a4f542c-a8c1-46c7-9899-a3fad0940cf6 at x11g2000yqc.googlegroups.com>  bclark76<bclark76 at gmail.com>  writes:
>
>> mypackage
>>      __init__.py
>>      myfunc.py
>>      MyClass.py
>> from mypackage import MyClass
> Try this instead:
>
>    from mypackage.MyClass import MyClass
>



From __peter__ at web.de  Wed Sep  7 13:30:34 2011
From: __peter__ at web.de (Peter Otten)
Date: Wed, 07 Sep 2011 19:30:34 +0200
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <j489np$4c6$1@dough.gmane.org>

bclark76 wrote:

> I'm learning python, and was playing with structuring packages.

If you are coming from Jave you have to unlearn a thing or two.
 
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.

> I'm trying to follow the rule that every file defines only one class.
> I could define MyClass in __init__.py, but then what if I wanted to
> define more classes in the mypackage package? My one class per file
> rule goes out the window.
> 
> Is this rule wrongheaded, 

Yes. 

> or is there another way to do this?

I recommend that you always start out with a module. Once that becomes 
unwieldy you can convert it into a package. Let's assume that

mystuff.py

contains a MyClass that you want to move into a separate file. You get the 
following files:

mystuff
    __init__.py
    descriptivename.py # MyClass here

Note that all filenames are lowercase. If you add the line

from .descriptivename import MyClass

to __init__.py you can continue to import and use MyClass with the statement

from mystuff import MyClass
m = MyClass()

or

import mystuff
m = mystuff.MyClass()

The disadvantage is of course that mystuff.descriptivename will always be 
imported, even if you don't need the part of the mystuff package defined 
there.

You may also have a look into unittest as an example of a module that was 
recently converted into a package. Classes and functions are grouped into 
submodules by their functionality rather than employing Java's mechanical 
one-class-per-file pattern.




From rantingrick at gmail.com  Wed Sep  7 13:56:53 2011
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 7 Sep 2011 10:56:53 -0700 (PDT)
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <d670a1ae-747c-4e89-9833-698b2ef30fc9@q8g2000yqe.googlegroups.com>

On Sep 7, 10:56?am, bclark76 <bclar... at gmail.com> wrote:
> I'm learning python, and was playing with structuring packages.
>
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.
>
> so I create:
>
> mypackage
> ? ? __init__.py
> ? ? myfunc.py
> ? ? MyClass.py

Don't tell me you create a module called myfunc.py??? Stuff that
function in __init__! Also don't name modules MyClass either. Both the
spelling and grammar is incorrect. ALL modules use lowercase (and only
integrate underscores in the most dire of need!)

geom
   __init__.py
   vector3d.py
   point3d.py
   transformation.py

from geom.transformation import Transformation
from geom.vector3d import Vector3d
from geom.point3d import Point3d

or alternatively:

geom
   __init__.py
       from __vector3d import Vector3d
       from __point3d import Point3d
       from __transformation import Transformation
   __vector3d.py
   __point3d.py
   __transformation.py

from geom import Transformation
from geom import Vector3d
from geom import Point3d

Although this method can be brittle due to the fact that one buggy
module can break all the imported code in the __init__ module. I
usually opt for specifying the module in the import path.


From tyler at tysdomain.com  Wed Sep  7 14:11:23 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Wed, 07 Sep 2011 12:11:23 -0600
Subject: How to structure packages
In-Reply-To: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <4E67B3CB.8020600@tysdomain.com>

On 9/7/2011 9:56 AM, bclark76 wrote:
> I'm learning python, and was playing with structuring packages.
>
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.
>
>
> so I create:
>
> mypackage
>      __init__.py
>      myfunc.py
>      MyClass.py
>
>
> my __init__.py is blank.
>
> my MyClass.py looks like:
>
> import blah
>
> class MyClass(blahblah):
>      blah
>      blah
>      blah
>
>
> then I have a run.py that looks like
>
> from mypackage import MyClass
>
>
> x = MyClass()
>
>
> This doesn't work because MyClass is mypackage.MyClass.MyClass.
> There's this MyClass module 'in the way'.
>
You can use the __init__.py to promote that class up. so:
from myclass import myclass
So that means that myclass will just be in mypackage.myclass, and thus 
your from mypackage import myclass would work perfectly. I'm not sure if 
this is how you're supposed to do it, but it works.

> I'm trying to follow the rule that every file defines only one class.
> I could define MyClass in __init__.py, but then what if I wanted to
> define more classes in the mypackage package? My one class per file
> rule goes out the window.
>
> Is this rule wrongheaded, or is there another way to do this?
>
>
> Thanks.
>


-- 

Take care,
Ty
Web: http://tds-solutions.net

Sent from my toaster.



From emile at fenx.com  Wed Sep  7 14:21:22 2011
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 07 Sep 2011 11:21:22 -0700
Subject: PEP 20 - Silly Question?
In-Reply-To: <CAKoEMEe9AFUkvn5W8GTHJs_bRO-e0dO9KJfC5HXRGyMad+PtvA@mail.gmail.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
	<877h5lnq8a.fsf@benfinney.id.au>
	<4E66C824.6010008@mrabarnett.plus.com>
	<CAKoEMEe9AFUkvn5W8GTHJs_bRO-e0dO9KJfC5HXRGyMad+PtvA@mail.gmail.com>
Message-ID: <j48cjd$pc5$1@dough.gmane.org>

On 9/6/2011 6:31 PM Joshua Miller said...
> You sure it wasn't the invisible one? you know the one in the white
> text that blends into the background?

Aah!  So _that's_ significant whitespace!

:)

Emile




From xnews2 at fredp.lautre.net  Wed Sep  7 14:24:29 2011
From: xnews2 at fredp.lautre.net (Fred Pacquier)
Date: 07 Sep 2011 18:24:29 GMT
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
	<4e6719f1$0$38260$3b214f66@aconews.univie.ac.at>
Message-ID: <Xns9F59CF99ADCBFPaCmAnRDLM@212.27.60.39>

Wow, what an impressive turnout !

Thanks a lot, rantingrick, CM and Herbert, for the fast answers, useful 
tips and especially the sample code !

Beats starting from a blank page, with a big stick, and will certainly set 
me on my way much faster...

networkx does seem a bit over the top for my simple goal, but both the Tk 
(I always forget Tk !) and Matplotlib approaches seem to fit the KISS 
principle just fine... on to the tinkering now :-)

Again, thanks to all !
fp


From ssegvic at zemris.fer.hr  Wed Sep  7 14:33:57 2011
From: ssegvic at zemris.fer.hr (=?utf-8?Q?Sini=C5=A1a_=C5=A0egvi=C4=87?=)
Date: Wed, 7 Sep 2011 20:33:57 +0200 (CEST)
Subject: Portable locale usage
In-Reply-To: <4E6784E8.2040206@shopzeus.com>
Message-ID: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>

> From: "Laszlo Nagy" <gandalf at shopzeus.com>
> To: "ssegvic" <sinisa.segvic at fer.hr>, python-list at python.org
> Sent: Wednesday, September 7, 2011 4:51:20 PM
> Subject: Re: Portable locale usage
> > 1. Is there a way for writing portable Python code dealing with
> > locales (as sketched in the beginning)?
> I usually do this at the top of my main program, before importing
> other modules:
> 
> import locale
> locale.setlocale(locale.LC_ALL, '')

I have set the system-wide locale to Croatian (Croatia) 
on my development system as instructed by:
http://windows.microsoft.com/en-US/windows-vista/Change-the-system-locale

Nevertheless, your proposal produces: 
('English_United States','1252')

Note that I would very much like 
to avoid changing the system locale
(this requires Administrator password and system restart).

Setting the locale for my program only would be interesting,
but AFAIK this can not be done on Windows (?).

> Why are you trying to force a specific locale to your program anyway?

Because I wish to be able to correctly sort Croatian names.

I expect that most of my Windows users will not care 
to configure their computers with the national locale 
(and besides, that does not seem to work, anyway).

Cheers,

Sinisa


From jenn.duerr at gmail.com  Wed Sep  7 15:33:03 2011
From: jenn.duerr at gmail.com (noydb)
Date: Wed, 7 Sep 2011 12:33:03 -0700 (PDT)
Subject: Adding a ranking based on two fields
References: <9b98790e-f482-48f9-93e9-80b32f6b4583@g31g2000yqh.googlegroups.com>
	<mailman.425.1314305617.27778.python-list@python.org>
Message-ID: <0fa8fa0d-51e7-4185-aa37-3bbf358f396b@a12g2000yqi.googlegroups.com>

On Aug 25, 4:53?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Aug 25, 2011 at 1:38 PM, noydb <jenn.du... at gmail.com> wrote:
> > Hello All,
>
> > Looking for some advice/ideas on how to implement arankingto a
> > 'scores' field I have. ?So this scores field has values ranging from
> > 1.00-4. ?There is also a count field. ?I want to add a rank field such
> > that all the records have a uniqueranking, 1 through the number of
> > records (thousands). ?The rank isbasedon the score first, the count
> > second. ?So, a record with a score of 4 and a count of 385 is ranked
> > higher than a record with a score of 4 and a count of 213 AND higher
> > than record with a score of 3.25 with a count of 4640.
>
> > My thought was to add the unique score values to a list and loop thru
> > the list... sort records with score=listItem, addranking... not quite
> > sure how to do this!
>
> things = getListOfYourThings()
> things.sort(reverse=True, key=lambda item: (item.score, item.count))
> for i, thing in enumerate(things):
> ? ? thing.rank = i + 1
>
> Cheers,
> Chris
> --http://rebertia.com

Thanks for this!

Someone passed this along, too - helpful
http://wiki.python.org/moin/HowTo/Sorting


From neubyr at gmail.com  Wed Sep  7 15:58:05 2011
From: neubyr at gmail.com (neubyr)
Date: Wed, 7 Sep 2011 14:58:05 -0500
Subject: MIMEText encode error - Python 2.6.6
In-Reply-To: <4E669920.3010704@mrabarnett.plus.com>
References: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>
	<4E669920.3010704@mrabarnett.plus.com>
Message-ID: <CALFxCvzBAPbX+A5_urAOOKZfWz1dHVVrc3UrAwXKxC24WeAg7A@mail.gmail.com>

On Tue, Sep 6, 2011 at 5:05 PM, MRAB <python at mrabarnett.plus.com> wrote:
> On 06/09/2011 22:52, neubyr wrote:
>>
>> I am trying to write a program which can email file's content using
>> smtplib. I am getting following error while using Python 2.6.6
>> version.
>>
>> {{{
>> File "./killed_jobs.py", line 88, in sendmail
>> ? ?msg = MIMEText(ipfile.read, 'plain')
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/mime/text.py",
>> line 30, in __init__
>> ? ?self.set_payload(_text, _charset)
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
>> line 224, in set_payload
>> ? ?self.set_charset(charset)
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
>> line 266, in set_charset
>> ? ?cte(self)
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/encoders.py",
>> line 73, in encode_7or8bit
>> ? ?orig.encode('ascii')
>> AttributeError: 'builtin_function_or_method' object has no attribute
>> 'encode'
>>
>> }}}
>>
>>
>> I am referring to email examples on the doc site
>>
>> http://docs.python.org/release/2.6.6/library/email-examples.html#email-examples
>> . Following is the msg object part in my code:
>>
>> {{{
>> ...
>> ...
>> def sendmail(inputfile):
>> ? ? ? ? ipfile = open(inputfile, 'r')
>> ? ? ? ? msg = MIMEText(ipfile.read, 'plain')
>> ? ? ? ? ipfile.close()
>>
>> ...
>> ...
>> }}}
>>
>> I have tried setting subtype and chartype separately as mentioned here
>> - http://docs.python.org/release/2.6.6/library/email.mime.html, but
>> the error remains same. Any help on what might be wrong here?
>>
> The docs say:
>
> ? ?MIMEText(_text[, _subtype[, _charset]])
>
> ? ?... _text is the string for the payload ...
>
> You're passing ipfile.read, which is the read method of the file. You
> should be passing the string returned by calling ipfile.read, ie
> ipfile.read().
> --
>

thanks got pointing that..

--


From t at jollybox.de  Wed Sep  7 17:14:26 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 07 Sep 2011 23:14:26 +0200
Subject: Portable locale usage
In-Reply-To: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
References: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
Message-ID: <4E67DEB2.5060003@jollybox.de>

On 07/09/11 20:33, Sini?a ?egvi? wrote:
> I expect that most of my Windows users will not care 
> to configure their computers with the national locale 
> (and besides, that does not seem to work, anyway).

Are, on Windows, the default system region/language setting, and the
locale, distinct? (And, if so, why?!)


From anikom15 at gmail.com  Wed Sep  7 17:35:25 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 7 Sep 2011 14:35:25 -0700
Subject: How to structure packages
In-Reply-To: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <20110907213525.GA6955@Smoke>

First of all MyClass.py should be renamed to myclass.py.  Module names
should be lowercase.  Secondly, put this in __init__.py:

    from .myclass import MyClass

and there you go.

On Wed, Sep 07, 2011 at 08:56:32AM -0700, bclark76 wrote:
> I'm learning python, and was playing with structuring packages.
> 
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.
> 
> 
> so I create:
> 
> mypackage
>     __init__.py
>     myfunc.py
>     MyClass.py
> 
> 
> my __init__.py is blank.
> 
> my MyClass.py looks like:
> 
> import blah
> 
> class MyClass(blahblah):
>     blah
>     blah
>     blah
> 
> 
> then I have a run.py that looks like
> 
> from mypackage import MyClass
> 
> 
> x = MyClass()
> 
> 
> This doesn't work because MyClass is mypackage.MyClass.MyClass.
> There's this MyClass module 'in the way'.
> 
> 
> I'm trying to follow the rule that every file defines only one class.
> I could define MyClass in __init__.py, but then what if I wanted to
> define more classes in the mypackage package? My one class per file
> rule goes out the window.
> 
> Is this rule wrongheaded, or is there another way to do this?
> 
> 
> Thanks.
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list


From laurent.payot at gmail.com  Wed Sep  7 17:35:41 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 14:35:41 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
Message-ID: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>

Hi there,

What is the simplest way to check that you are at the beginning or at the end of an iterable? I'm using enumerate with Python 3.2 (see below) but I'm wondering if there would be a better way.


l = ['a', 'b', 'a', 'c']

for pos, i in enumerate(l):
    if pos == 0:
        print("head =", i)
    else:
        print(i)


I know that Python is not exactly a functional language but wouldn't something like "ishead()" or "istail()" be useful?



From cs at zip.com.au  Wed Sep  7 18:48:24 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Thu, 8 Sep 2011 08:48:24 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
Message-ID: <20110907224824.GA29885@cskk.homeip.net>

On 07Sep2011 14:35, Laurent <laurent.payot at gmail.com> wrote:
| What is the simplest way to check that you are at the beginning or at
| the end of an iterable? I'm using enumerate with Python 3.2 (see below)
| but I'm wondering if there would be a better way.
| 
| l = ['a', 'b', 'a', 'c']
| 
| for pos, i in enumerate(l):
|     if pos == 0:
|         print("head =", i)
|     else:
|         print(i)
| 
| I know that Python is not exactly a functional language but wouldn't
| something like "ishead()" or "istail()" be useful?

There are a few reasons these do not exist out of the box (quite aside
from how easy it is to do on the occasions you actually want it).
Tackling ishead and istail in turn...

The "ishead()" would need to be a top level function (like "len()")
because if it were an iterator method, every iterator would need to have
it implemented; currently the number of methods needed to roll your own
iterator is just two (iter and next). ishead() could be done as a top
level function, though it would need the storage cost of an additional
state value to every iterator (i.e. a "first" boolean or equivalent). So
you'd be proposing more memory cost and possibly a retrospective code
change for all the existing planetwide code, for a minor convenient. As
you note, enumerate gets you a pos value, and it is easy enough to write
a for loop like this:

  first = True
  for i in iterable_thing:
    if first:
      print "head =", i
    else:
      print i
    first = False

Your istail() is much worse.

A generator would need to do lookahead to answer istail() in the general
case. Consider iterating over the lines in a file, or better still the
lines coming from a pipeline. Or iteraing over packets received on a
network connection. You can't answer "istail()" there until you have
seen the next line/packet (or EOF/connection close). And that may be an
arbitrary amount of time in the future. You're going to stall your whole
program for such a question?

You can do this easily enough for yourself as an itertools-like thing:
write a wrapper generator that answers ishead() and istail() for
arbitrary iterators. Completely untested example code:

  class BoundSensitiveIterator(object):
    def __init__(self, subiter):
      self.sofar = 0
      self.subiter = subiter
      self.pending = ()
    def iter(self):
      return self
    def next(self):
      self.sofar += 1
      if self.pending is None:
        raise StopIteration
      if self.pending:
        nxt = self.pending[0]
        self.pending = ()
        return nxt
      return self.subiter.next()
    def ishead(self):
      # maybe <= 1, depending on what you want it to mean
      return self.sofar == 1
    def istail(self):
      if self.pending is None:
        return True
      if self.pending:
        return False
      try:
        nxt = self.subiter.next()
      except StopIteration:
        self.pending = None
        return True
      else:
        self.pending = (nxt,)
        return False

  I = BoundSensitiveIterator(other_iterable)
  for n in I:
    print n, "ishead =", I.ishead(), "istail =", I.istail()

You can see it adds some performance and storage overhead, and of course
may stall if you every ask istail() of an "on demand" iterable.

About the only time I do this is my personal "the()" convenience
function:

  def the(list, context=None):
    ''' Returns the first element of an iterable, but requires there to be
        exactly one.
    '''
    icontext="expected exactly one value"
    if context is not None:
      icontext=icontext+" for "+context

    first=True
    for elem in list:
      if first:
        it=elem
        first=False
      else:
        raise IndexError, "%s: got more than one element (%s, %s, ...)" \
                          % (icontext, it, elem)

    if first:
      raise IndexError, "%s: got no elements" % icontext
      
    return it

Which I use as a definite article in places where an iterable _should_
yield exactly one result (eg SQL SELECTs that _ought_ to get exactly
one hit). I can see I wrote that a long time ago - it could do with some
style fixes. And a code scan shows it sees little use:-)

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Electronic cardboard blurs the line between printed objects and the virtual
world.  - overhead by WIRED at the Intelligent Printing conference Oct2006


From piet at vanoostrum.org  Wed Sep  7 18:52:20 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 00:52:20 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
	<f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>
	<9cmq1vFk6fU1@mid.individual.net>
	<mailman.809.1315328739.27778.python-list@python.org>
	<9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
	<d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>
	<9cpbddFtidU1@mid.individual.net>
Message-ID: <m2zkigartn.fsf@cochabamba.vanoostrum.org>

"Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:


> INFO:DAVServer.fshandler:get_data: d:\webdav not found
> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1> 
> Gecko/
> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
> Gecko/
> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>
>From the log it looks like you are trying to access the server with the
url:

http://localhost:8008/ or something similar. 

This won't work as you would try to access the root of your webdav
directory in this way (i.e. D:/webdav). The webdav server can only serve
files, not directories, so you would have to access
http://localhost:8008/somefile.txt where somefile.txt is a file in
D:/webdav.

This only applies to acces using a browser. If you access the server
through a webdav-aware client (for example the Finder on Mac OS X, or
probably the Windows Explorer) it can serve the contents of the directory.
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From martin.rixham at gmail.com  Wed Sep  7 18:57:04 2011
From: martin.rixham at gmail.com (Martin Rixham)
Date: Wed, 7 Sep 2011 23:57:04 +0100
Subject: I am confused by
Message-ID: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>

Hi all
I would appreciate some help understanding something. Basically I am
confused by the following:

>>> a = [[0, 0], [0, 0]]
>>> b = list(a)
>>> b[0][0] = 1
>>> a
[[1, 0], [0, 0]]

I expected the last line to be

[[0, 0], [0, 0]]

I hope that's clear enough.

Martin
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From piet at vanoostrum.org  Wed Sep  7 19:01:07 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 01:01:07 +0200
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<j3lnlf$8eu$1@dough.gmane.org>
	<mailman.619.1314810786.27778.python-list@python.org>
Message-ID: <m2vct4arf0.fsf@cochabamba.vanoostrum.org>

"Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:

> It seems to me that if I add a function to the list of class attributes it will automatically wrap with "self" but adding it to the object directly will not wrap the function as a method. Can somebody explain why? I would have thought that any function added to an object would be a method (unless decorated as a class method). 

The special magic to transform a function into a method is only applied
for functions found as attributes of the class, not for instance
attributes. It is a matter of design.

> Hmm, or does the decoration just tell Python not to turn an object's function into a method? I.e. Is the decorator basically just the syntactic sugar for doing the above?

The classmethod decorator transforms the method (or actually the
function) into a different kind of object (a class method). 
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From laurent.payot at gmail.com  Wed Sep  7 19:22:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 16:22:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.849.1315435715.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
Message-ID: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>

I totally understand the performance issue that an hypothetical "istail" would bring, even if I think it would just be the programmer's responsibility not to use it when it's not certain that an end can be detected. 
But I don't see why *adding* something like "ishead" would be so bad (at worse by using a boolean somewhere as you mentioned).

Anyway I was just asking if there is something better than enumerate. So the answer is no? The fact that I have to create a tuple with an incrementing integer for something as simple as checking that I'm at the head just sounds awfully unpythonic to me.


From laurent.payot at gmail.com  Wed Sep  7 19:22:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 16:22:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.849.1315435715.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
Message-ID: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>

I totally understand the performance issue that an hypothetical "istail" would bring, even if I think it would just be the programmer's responsibility not to use it when it's not certain that an end can be detected. 
But I don't see why *adding* something like "ishead" would be so bad (at worse by using a boolean somewhere as you mentioned).

Anyway I was just asking if there is something better than enumerate. So the answer is no? The fact that I have to create a tuple with an incrementing integer for something as simple as checking that I'm at the head just sounds awfully unpythonic to me.


From fnautaNO at SPAMsolfon.nl  Wed Sep  7 19:28:03 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Thu, 8 Sep 2011 01:28:03 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net><mailman.823.1315377607.27778.python-list@python.org><9cor4gFk15U1@mid.individual.net><d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com><9cpbddFtidU1@mid.individual.net>
	<m2zkigartn.fsf@cochabamba.vanoostrum.org>
Message-ID: <9cqdb0Fpn4U1@mid.individual.net>

"Piet van Oostrum" <piet at vanoostrum.org> wrote in message 
news:m2zkigartn.fsf at cochabamba.vanoostrum.org...
> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>
>
>> INFO:DAVServer.fshandler:get_data: d:\webdav not found
>> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1>
>> Gecko/
>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1>
>> Gecko/
>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>
> From the log it looks like you are trying to access the server with the
> url:
>
> http://localhost:8008/ or something similar.

Yes, I do.

> This won't work as you would try to access the root of your webdav
> directory in this way (i.e. D:/webdav). The webdav server can only serve
> files, not directories, so you would have to access
> http://localhost:8008/somefile.txt where somefile.txt is a file in
> D:/webdav.

OK, thanks. I am not familiar to WebDAV.
I tried. Got something different (at least something happened):
"Setuptools version 0.6c9 or greater has been installed.
(Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"

Wasn't able to find ez_setup.py yet.

> This only applies to acces using a browser. If you access the server
> through a webdav-aware client (for example the Finder on Mac OS X, or
> probably the Windows Explorer) it can serve the contents of the directory.
> -- 

Thanks. I am just trying to use a calendar with a webdav server. I don't 
have any experience with that.
Simply using my browser to try it out.

Fokke 




From gherron at digipen.edu  Wed Sep  7 19:31:37 2011
From: gherron at digipen.edu (Gary Herron)
Date: Wed, 07 Sep 2011 16:31:37 -0700
Subject: I am confused by
In-Reply-To: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
References: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
Message-ID: <4E67FED9.7050609@digipen.edu>

On 09/07/2011 03:57 PM, Martin Rixham wrote:
> Hi all
> I would appreciate some help understanding something. Basically I am 
> confused by the following:
>
> >>> a = [[0, 0], [0, 0]]
> >>> b = list(a)
> >>> b[0][0] = 1
> >>> a
> [[1, 0], [0, 0]]
>
> I expected the last line to be
>
> [[0, 0], [0, 0]]
>
> I hope that's clear enough.
>
> Martin

You were expecting the assignment to "b" to create a copy of the 
original list, and it does, but the copy is only one level deep.

So a and b are different lists, but a[i] and b[i] are the same objects 
for each i.

There is a "deepcopy" in the library which may do what you expect.

Gary Herron


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From python at mrabarnett.plus.com  Wed Sep  7 19:39:02 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 00:39:02 +0100
Subject: I am confused by
In-Reply-To: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
References: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
Message-ID: <4E680096.1020001@mrabarnett.plus.com>

On 07/09/2011 23:57, Martin Rixham wrote:
> Hi all
> I would appreciate some help understanding something. Basically I am
> confused by the following:
>
>  >>> a = [[0, 0], [0, 0]]
>  >>> b = list(a)
>  >>> b[0][0] = 1
>  >>> a
> [[1, 0], [0, 0]]
>
> I expected the last line to be
>
> [[0, 0], [0, 0]]
>
> I hope that's clear enough.
>
What you were expecting is called a "deep copy".

You should remember that a list doesn't contain objects themselves, but
only _references_ to objects.

"list" will copy the list itself (a "shallow copy"), including the
references which are in it, but it won't copy the _actual_ objects to
which they refer.

Try using the "deepcopy" function from the "copy" module:

 >>> from copy import deepcopy
 >>> a = [[0, 0], [0, 0]]
 >>> b = deepcopy(a)
 >>> b[0][0] = 1
 >>> a
[[0, 0], [0, 0]]


From python.list at tim.thechases.com  Wed Sep  7 20:01:33 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 07 Sep 2011 19:01:33 -0500
Subject: Best way to check that you are at the beginning (the end) of
	an iterable?
In-Reply-To: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>	<mailman.849.1315435715.27778.python-list@python.org>
	<d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
Message-ID: <4E6805DD.60607@tim.thechases.com>

On 09/07/11 18:22, Laurent wrote:
> Anyway I was just asking if there is something better than
> enumerate. So the answer is no? The fact that I have to create
> a tuple with an incrementing integer for something as simple
> as checking that I'm at the head just sounds awfully
> unpythonic to me.

I've made various generators that are roughly (modulo 
edge-condition & error checking) something like

  def with_prev(it):
    prev = None
    for i in it:
      yield prev, i
      i = prev

  def with_next(it):
    prev = it.next()
    for i in it:
      yield prev, i
      prev = i
    yield prev, None

which can then be used something like your original

   for cur, next in with_next(iterable):
     if next is None:
       do_something_with_last(cur)
     else:
       do_regular_stuff_with_non_last(cur)

   for prev, cur in with_prev(iterable):
     if prev is None:
       do_something_with_first(cur)
     else:
       do_something_with_others(cur)

If your iterable can return None, you could create a custom 
object to signal the non-condition:

   NO_ITEM = object()

and then use NO_ITEM in place of "None" in the above code.

-tkc




From cs at zip.com.au  Wed Sep  7 20:23:14 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Thu, 8 Sep 2011 10:23:14 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
Message-ID: <20110908002314.GA15766@cskk.homeip.net>

On 07Sep2011 16:22, Laurent <laurent.payot at gmail.com> wrote:
| I totally understand the performance issue that an hypothetical
| "istail" would bring, even if I think it would just be the programmer's
| responsibility not to use it when it's not certain that an end can
| be detected.

The trouble with these things is that their presence leads to stallable
code, often in libraries. Let the programmer write code dependent on
istail() without thinking of the stall case (or even the gratuitous
execution case, as in a generator with side effects in calling .next())
and have that buried in a utilities function.

Facilities like feof() in C and eof in Pascal already lead to lots of
code that runs happily with flat files and behaves badly in interactive
or piped input. It is _so_ easy to adopt a style like:

  while not eof(filehandle):
    line = filehandle.nextline()
    ...

that is it often thought that having offered the eof() function is a
design error. (Of course in the example above the usual python idiom
would win out from existing habit, but there are plenty of other
situations where is would just be _easy_ to rely of istail() in whatever
form.)

| But I don't see why *adding* something like "ishead" would be so bad
| (at worse by using a boolean somewhere as you mentioned).

It is not awful, but as remarked:
  - extra storage cost to _every_ iterable, for a rarely used facility
  - extra runtime cost to maintain the state
  - _retroactive_ burden on _every_ iterator implementation presently
    existing; every iterator sudden needs to implement and offer this
    extra facility to be generate purpose use
  - it is easy to provide the facility on the rare occasions when it is
    needed

Personally, I think point 3 above is the killer and 1 and 2 are serious
counter arguments.

| Anyway I was just asking if there is something better than enumerate. So
| the answer is no? The fact that I have to create a tuple with an
| incrementing integer for something as simple as checking that I'm at
| the head just sounds awfully unpythonic to me.

You can just use a boolean if you like. I have plent of loops like:

  first = true
  for i in iterable:
    if first:
      blah ...
    ...
    first = False

Cheap and easy. Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Bye and bye, God caught his eye, - Epitaph for a waiter by David McCord


From miki.tebeka at gmail.com  Wed Sep  7 20:24:53 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Wed, 7 Sep 2011 17:24:53 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
Message-ID: <7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>

I guess enumerate is the best way to check for first argument. Note that if someone passes you the iterator as argument you have now way of checking if the consumed items from it.

istail can be implemented using itertools.chain, see https://gist.github.com/1202260


From steve+comp.lang.python at pearwood.info  Wed Sep  7 20:24:58 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 08 Sep 2011 10:24:58 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
Message-ID: <4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>

Laurent wrote:

> Hi there,
> 
> What is the simplest way to check that you are at the beginning or at the
> end of an iterable?


I don't think this question is meaningful. There are basically two
fundamental types of iterables, sequences and iterators.

Sequences have random access and a length, so if the "start" and "end" of
the sequence is important to you, just use indexing:

beginning = sequence[0]
end = sequence[-1]
for i, x in enumerate(sequence):
    if i == 0: print("at the beginning")
    elif i == len(sequence)-1: print("at the end")
    print(x)


Iterators don't have random access, and in general they don't have a
beginning or an end. There may not be any internal sequence to speak of:
the iterator might be getting data from a hardware device that provides
values continuously, or some other series of values without a well-defined
beginning or end. Example:

def time():
    from time import asctime
    while True:
        yield asctime()

it = time()

What would it even mean to say that I am at the beginning or end of it?

Iterators have no memory, so in one sense you are *always* at the beginning
of the iterator: next() always returns the next item, and the previous item
is lost forever. So the answer to the question "Am I at the beginning of an
iterator?" is always "You are now".

For sequences, the question is best handled differently. For iterators, the
question doesn't make sense in general. If you need an iterator that can
report its internal state, write your own:

import random, time
class MyIter(object):
    def __init__(self):
        self.start = True
        self.end = False
    def __next__(self):
        if self.start:
            self.start = False
        if self.end:
            raise StopIteration
        if random.random() < 0.01:
            self.end = True
        return time.asctime()
    def __iter__(self):
        return self



-- 
Steven



From steve+comp.lang.python at pearwood.info  Wed Sep  7 20:29:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 08 Sep 2011 10:29:26 +1000
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
Message-ID: <4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>

Peter Otten wrote:

> Classes and functions are grouped into
> submodules by their functionality rather than employing Java's mechanical
> one-class-per-file pattern.

Surely it's an anti-pattern?

I suppose "one class per file" might be useful for those using an editor
with no search functionality. Other than that, is there any justification
for this rule? Any Java fans want to defend this?

If "one class per file", why not "one method per class" too? Why is the
second rule any more silly than the first?



-- 
Steven



From cdchong at stanford.edu  Wed Sep  7 20:37:51 2011
From: cdchong at stanford.edu (Christophe Chong)
Date: Wed, 7 Sep 2011 17:37:51 -0700
Subject: Floating point multiplication in python
In-Reply-To: <j44rre$e4c$1@r03.glglgl.eu>
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu>
Message-ID: <CAFS6CezHfHvGveDDc+8y03VGQxDo0W7Z7K8RMRaMEyzWrj7txA@mail.gmail.com>

And then we learned in class what happens when you're calculating "0.1" with
different precision in the industry.

http://www.ima.umn.edu/~arnold/disasters/patriot.html

Beware.

On Tue, Sep 6, 2011 at 3:14 AM, Thomas Rachel <
nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de> wrote:

> Am 06.09.2011 07:57 schrieb xyz:
>
>> hi all:
>>
>> As we know ,  1.1 * 1.1 is 1.21 .
>> But in python ,I got following :
>>
>>  1.1 * 1.1
>>>>>
>>>> 1.2100000000000002
>>
>> why python get wrong result? Who can tell me  where's the
>> 0.0000000000000002 from?
>>
>
> 1.1 does not fit in a binary floating point number. It is approximated - in
> binary! - as 1.000110011001100110011 ... (periodically).
>
> Note that, while in the decimal system we normally use, only numbers which
> have other components in the denominator than 2 or 5 are periodically, in
> the binary systems only components with 2 are allowed in order not to be
> periodically.
>
> Example: 3.453 is not periodically, because it is 3453/100 and 100 has only
> the factors 2 and 5, each twice.
>
> 1/3 = .3333333... is periodically, because it has the factor 3. The same
> applies to 1/6, which has 2 and 3 as factors. The latter destroys the
> non-periodical behaviour.
>
> As said, in the dual system, only the 2 is allowed.
>
> .5 (10) = 2** -1 = .1 (2).
> .25 (10) = 2 ** -2 = .01 (2).
> .75 (10) = their sum = .11 (2).
>
> But .1 (1/10) is more complicated, -2 would be as well.
>
> As the IEEE floating point representation is limited, there is a slight
> error value which makes the stored value differ from the intended one.
>
> Look here:
>
>
>
>  x=(1,0,0,0,1,1,0,0,1,1,0,0,1,**1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,**
>>>> 1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,**0,1,1,0,0,1,1,0,0,1,1,0,0,1,1)
>>>> a=0
>>>> for n,i in enumerate(x): a += i*2**-n; print a, a-1.1, i*2**-n, a-olda
>>>>
>>> ...
> 1 -0.1 1 1
> 1.0 -0.1 0.0 0.0
> 1.0 -0.1 0.0 0.0
> 1.0 -0.1 0.0 0.0
> 1.0625 -0.0375 0.0625 0.0625
> 1.09375 -0.00625 0.03125 0.03125
> 1.09375 -0.00625 0.0 0.0
> 1.09375 -0.00625 0.0 0.0
> 1.09765625 -0.00234375 0.00390625 0.00390625
> 1.099609375 -0.000390625 0.001953125 0.001953125
> 1.099609375 -0.000390625 0.0 0.0
> 1.099609375 -0.000390625 0.0 0.0
> 1.09985351562 -0.000146484375 0.000244140625 0.000244140625
> 1.09997558594 -2.44140625001e-05 0.0001220703125 0.0001220703125
> 1.09997558594 -2.44140625001e-05 0.0 0.0
> 1.09997558594 -2.44140625001e-05 0.0 0.0
> 1.09999084473 -9.15527343759e-06 1.52587890625e-05 1.52587890625e-05
> 1.09999847412 -1.52587890634e-06 7.62939453125e-06 7.62939453125e-06
> 1.09999847412 -1.52587890634e-06 0.0 0.0
> 1.09999847412 -1.52587890634e-06 0.0 0.0
> 1.0999994278 -5.72204589933e-07 9.53674316406e-07 9.53674316406e-07
> 1.09999990463 -9.53674317294e-08 4.76837158203e-07 4.76837158203e-07
> 1.09999990463 -9.53674317294e-08 0.0 0.0
> 1.09999990463 -9.53674317294e-08 0.0 0.0
> 1.09999996424 -3.57627869541e-08 5.96046447754e-08 5.96046447754e-08
> 1.09999999404 -5.96046456636e-09 2.98023223877e-08 2.98023223877e-08
> 1.09999999404 -5.96046456636e-09 0.0 0.0
> 1.09999999404 -5.96046456636e-09 0.0 0.0
> 1.09999999776 -2.23517426789e-09 3.72529029846e-09 3.72529029846e-09
> 1.09999999963 -3.72529118664e-10 1.86264514923e-09 1.86264514923e-09
> 1.09999999963 -3.72529118664e-10 0.0 0.0
> 1.09999999963 -3.72529118664e-10 0.0 0.0
> 1.09999999986 -1.3969847501e-10 2.32830643654e-10 2.32830643654e-10
> 1.09999999998 -2.32831531832e-11 1.16415321827e-10 1.16415321827e-10
> 1.09999999998 -2.32831531832e-11 0.0 0.0
> 1.09999999998 -2.32831531832e-11 0.0 0.0
> 1.09999999999 -8.73123795486e-12 1.45519152284e-11 1.45519152284e-11
> 1.1 -1.45528034068e-12 7.27595761418e-12 7.27595761418e-12
> 1.1 -1.45528034068e-12 0.0 0.0
> 1.1 -1.45528034068e-12 0.0 0.0
> 1.1 -5.45785638906e-13 9.09494701773e-13 9.09494701773e-13
> 1.1 -9.10382880193e-14 4.54747350886e-13 4.54747350886e-13
> 1.1 -9.10382880193e-14 0.0 0.0
> 1.1 -9.10382880193e-14 0.0 0.0
> 1.1 -3.41948691585e-14 5.68434188608e-14 5.68434188608e-14
> 1.1 -5.77315972805e-15 2.84217094304e-14 2.84217094304e-14
> 1.1 -5.77315972805e-15 0.0 0.0
> 1.1 -5.77315972805e-15 0.0 0.0
> 1.1 -2.22044604925e-15 3.5527136788e-15 3.5527136788e-15
> 1.1 -4.4408920985e-16 1.7763568394e-15 1.7763568394e-15
> 1.1 -4.4408920985e-16 0.0 0.0
> 1.1 -4.4408920985e-16 0.0 0.0
> 1.1 -2.22044604925e-16 2.22044604925e-16 2.22044604925e-16
> 1.1 0.0 1.11022302463e-16 2.22044604925e-16
> 1.1 0.0 0.0 0.0
> 1.1 0.0 0.0 0.0
> 1.1 0.0 1.38777878078e-17 0.0
> 1.1 0.0 6.93889390391e-18 0.0
>
> So here we have reached the point where the maximum precision is reached -
> a doesn't change anymore, although it should. The error is about 1E-16.
>
> Now if you multiply two values with an error, the error also propagates
> into the result - PLUs the result can have its own error source - in the
> same order of magnitude.
>
> (a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e or
> (2*a + e) * e.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>



-- 
Christophe Chong
Department of Economics
Stanford University
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From laurent.payot at gmail.com  Wed Sep  7 20:53:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 17:53:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.854.1315441399.27778.python-list@python.org>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.854.1315441399.27778.python-list@python.org>
Message-ID: <c717ba23-1cdb-447d-9c1a-dd2d306b8bcb@glegroupsg2000goo.googlegroups.com>

Yes of course the use of a boolean variable is obvious but I'm mixing python code with html using Mako templates. In Mako for code readability reasons I try to stick to simple "for" and "if" constructions, and I try to avoid variables declarations inside the html, that's all.  Thanks anyway.


From laurent.payot at gmail.com  Wed Sep  7 20:53:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 17:53:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.854.1315441399.27778.python-list@python.org>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.854.1315441399.27778.python-list@python.org>
Message-ID: <c717ba23-1cdb-447d-9c1a-dd2d306b8bcb@glegroupsg2000goo.googlegroups.com>

Yes of course the use of a boolean variable is obvious but I'm mixing python code with html using Mako templates. In Mako for code readability reasons I try to stick to simple "for" and "if" constructions, and I try to avoid variables declarations inside the html, that's all.  Thanks anyway.


From laurent.payot at gmail.com  Wed Sep  7 21:05:17 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:05:17 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <ecf00f75-5686-427d-abf7-e97cdaa115d0@glegroupsg2000goo.googlegroups.com>


> I don't think this question is meaningful. There are basically two
> fundamental types of iterables, sequences and iterators.
> 
> Sequences have random access and a length, so if the "start" and "end" of
> the sequence is important to you, just use indexing:
> 
> beginning = sequence[0]
> end = sequence[-1]
> for i, x in enumerate(sequence):
>     if i == 0: print("at the beginning")
>     elif i == len(sequence)-1: print("at the end")
>     print(x)
> 
> 
> Iterators don't have random access, and in general they don't have a
> beginning or an end. There may not be any internal sequence to speak of:
> the iterator might be getting data from a hardware device that provides
> values continuously, or some other series of values without a well-defined
> beginning or end. 

Maybe I should have said "best way to check that you didn't start the iteration process yet" but you see what I mean.

Well I guess I have to unlearn my bad lisp/scheme habits...



From laurent.payot at gmail.com  Wed Sep  7 21:06:53 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:06:53 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
Message-ID: <ff37a8cf-2fdf-4e87-bbb1-ce70dd419ac3@glegroupsg2000goo.googlegroups.com>

Yes, I was just hoping for something already included that I wouldn't know (i'm new to Python).


From tjreedy at udel.edu  Wed Sep  7 21:06:56 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 07 Sep 2011 21:06:56 -0400
Subject: Best way to check that you are at the beginning (the end) of
	an iterable?
In-Reply-To: <20110908002314.GA15766@cskk.homeip.net>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<20110908002314.GA15766@cskk.homeip.net>
Message-ID: <j494h6$ppq$1@dough.gmane.org>

On 9/7/2011 8:23 PM, Cameron Simpson wrote:
> On 07Sep2011 16:22, Laurent<laurent.payot at gmail.com>  wrote:
> | I totally understand the performance issue that an hypothetical
> | "istail" would bring, even if I think it would just be the programmer's
> | responsibility not to use it when it's not certain that an end can
> | be detected.
>
> The trouble with these things is that their presence leads to stallable
> code, often in libraries. Let the programmer write code dependent on
> istail() without thinking of the stall case (or even the gratuitous
> execution case, as in a generator with side effects in calling .next())
> and have that buried in a utilities function.
>
> Facilities like feof() in C and eof in Pascal already lead to lots of
> code that runs happily with flat files and behaves badly in interactive
> or piped input. It is _so_ easy to adopt a style like:
>
>    while not eof(filehandle):
>      line = filehandle.nextline()
>      ...
>
> that is it often thought that having offered the eof() function is a
> design error. (Of course in the example above the usual python idiom
> would win out from existing habit, but there are plenty of other
> situations where is would just be _easy_ to rely of istail() in whatever
> form.)
>
> | But I don't see why *adding* something like "ishead" would be so bad
> | (at worse by using a boolean somewhere as you mentioned).
>
> It is not awful, but as remarked:
>    - extra storage cost to _every_ iterable, for a rarely used facility
>    - extra runtime cost to maintain the state
>    - _retroactive_ burden on _every_ iterator implementation presently
>      existing; every iterator sudden needs to implement and offer this
>      extra facility to be generate purpose use
>    - it is easy to provide the facility on the rare occasions when it is
>      needed
>
> Personally, I think point 3 above is the killer and 1 and 2 are serious
> counter arguments.

The iterator protocol is intentionally as simple as sensibly possible.

> | Anyway I was just asking if there is something better than enumerate. So
> | the answer is no? The fact that I have to create a tuple with an
> | incrementing integer for something as simple as checking that I'm at
> | the head just sounds awfully unpythonic to me.
>
> You can just use a boolean if you like. I have plent of loops like:
>
>    first = true
>    for i in iterable:
>      if first:
>        blah ...
>      ...
>      first = False
>
> Cheap and easy. Cheers,

Or grab and process the first item separately from the rest.

it = iter(iterable)
try:
   first = next(it)
   <process first item>
except StopIteration:
   raise ValueError("Empty iterable not allowed")
for i in it:
   <process non-first item>

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Wed Sep  7 21:08:11 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 07 Sep 2011 21:08:11 -0400
Subject: Best way to check that you are at the beginning (the end) of
	an iterable?
In-Reply-To: <4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j494jh$ppq$2@dough.gmane.org>

On 9/7/2011 8:24 PM, Steven D'Aprano wrote:

> I don't think this question is meaningful. There are basically two
> fundamental types of iterables, sequences and iterators.

And non-sequence iterables like set and dict.

> Sequences have random access and a length, so if the "start" and "end" of
> the sequence is important to you, just use indexing:
>
> beginning = sequence[0]
> end = sequence[-1]
> for i, x in enumerate(sequence):
>      if i == 0: print("at the beginning")
>      elif i == len(sequence)-1: print("at the end")
>      print(x)

And finite non-sequences can be turned into sequences with list(iterable).

-- 
Terry Jan Reedy



From laurent.payot at gmail.com  Wed Sep  7 21:08:51 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:08:51 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.857.1315443772.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
	<d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.857.1315443772.27778.python-list@python.org>
Message-ID: <e0009de6-de88-407e-be89-2b82d229fb7f@glegroupsg2000goo.googlegroups.com>

Interesting. I will check that yield functionality out. Thanks.


From laurent.payot at gmail.com  Wed Sep  7 21:08:51 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:08:51 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.857.1315443772.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
	<d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.857.1315443772.27778.python-list@python.org>
Message-ID: <e0009de6-de88-407e-be89-2b82d229fb7f@glegroupsg2000goo.googlegroups.com>

Interesting. I will check that yield functionality out. Thanks.


From jenn.duerr at gmail.com  Wed Sep  7 21:32:21 2011
From: jenn.duerr at gmail.com (noydb)
Date: Wed, 7 Sep 2011 18:32:21 -0700 (PDT)
Subject: how to make fxn argument work with setting a field value
Message-ID: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>

What do I need to do to line 14 code below to get it to recognize the
field name and not the argument name?

I get this error with below code at line 13, the print row.rankFld
line
>RuntimeError: Row: Field rankFld does not exist
A field called rankFld does not, should not exist.  rankFld is
"RANKa" (in this first iteration), which does exist (gets added in
line 6, verified).
Line 14 fails too, if 13 is commented out.


##
import arcpy

fc = r"C:\test\scratch.gdb\sort_test1"

def rank(inFC, outFC, scoreFld, popFld, rankFld):
    arcpy.AddField_management(inFC, rankFld, "LONG")
    arcpy.management.Sort(inFC, outFC, [[scoreFld, "DESCENDING"],
[popFld, "DESCENDING"]])
    i = 0
    print rankFld # >RANKa
    rows = arcpy.UpdateCursor(fc)
    for row in rows:
        i = i + 1
        print row.rankFld
        row.rankFld = i ## line 14
        rows.updateRow(row)

    return sortedFC
#

out1 = r"C:\test\scratch.gdb\rankfxn6"
out2 = r"C:\test\scratch.gdb\rankfxn7"

rank(fc, out1, "SCOREa", "COUNT1", "RANKa")
rank(out1, out2, "SCOREb", "COUNT2", "RANKb")
##


From laurent.payot at gmail.com  Wed Sep  7 21:40:23 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:40:23 -0700 (PDT)
Subject: Running Python Demo on the Web?
In-Reply-To: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
Message-ID: <d1496b92-b010-4499-9687-b13b9b6b52ac@glegroupsg2000goo.googlegroups.com>

Neat. But I can see some "print(x)" and some "print x". What is the Python version?


From python at mrabarnett.plus.com  Wed Sep  7 22:11:07 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 03:11:07 +0100
Subject: how to make fxn argument work with setting a field value
In-Reply-To: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
References: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
Message-ID: <4E68243B.7060104@mrabarnett.plus.com>

On 08/09/2011 02:32, noydb wrote:
> What do I need to do to line 14 code below to get it to recognize the
> field name and not the argument name?
>
> I get this error with below code at line 13, the print row.rankFld
> line
>> RuntimeError: Row: Field rankFld does not exist
> A field called rankFld does not, should not exist.  rankFld is
> "RANKa" (in this first iteration), which does exist (gets added in
> line 6, verified).
> Line 14 fails too, if 13 is commented out.
>
>
> ##
> import arcpy
>
> fc = r"C:\test\scratch.gdb\sort_test1"
>
> def rank(inFC, outFC, scoreFld, popFld, rankFld):
>      arcpy.AddField_management(inFC, rankFld, "LONG")
>      arcpy.management.Sort(inFC, outFC, [[scoreFld, "DESCENDING"],
> [popFld, "DESCENDING"]])
>      i = 0
>      print rankFld #>RANKa
>      rows = arcpy.UpdateCursor(fc)
>      for row in rows:
>          i = i + 1
>          print row.rankFld
>          row.rankFld = i ## line 14
>          rows.updateRow(row)
>
>      return sortedFC
> #
>
> out1 = r"C:\test\scratch.gdb\rankfxn6"
> out2 = r"C:\test\scratch.gdb\rankfxn7"
>
> rank(fc, out1, "SCOREa", "COUNT1", "RANKa")
> rank(out1, out2, "SCOREb", "COUNT2", "RANKb")
> ##
The documentation mentions "getValue" and "setValue":

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002z0000001q000000


From clp2 at rebertia.com  Wed Sep  7 22:27:09 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 7 Sep 2011 19:27:09 -0700
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
Message-ID: <CAMZYqRTo0hj80xk031b+VboyC2PO-evB1BTP4yvBn76NN5E1JQ@mail.gmail.com>

On Wed, Sep 7, 2011 at 5:24 PM, Miki Tebeka <miki.tebeka at gmail.com> wrote:
> I guess enumerate is the best way to check for first argument. Note that if someone passes you the iterator as argument you have now way of checking if the consumed items from it.
>
> istail can be implemented using itertools.chain, see https://gist.github.com/1202260

For the archives, if Gist ever goes down:

from itertools import chain

def istail(it):
    '''Check if iterator has one more element. Return True/False and
    iterator.'''
    try:
        i = next(it)
    except StopIteration:
        return False, it

    try:
        j = next(it)
        return False, chain([i, j], it)
    except StopIteration:
        return True, chain([i], it)


t, it = istail(iter([]))
print t, list(it)
t, it = istail(iter([1]))
print t, list(it)
t, it = istail(iter([1, 2]))
print t, list(it)


From rosuav at gmail.com  Wed Sep  7 22:39:16 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 8 Sep 2011 12:39:16 +1000
Subject: How to structure packages
In-Reply-To: <4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmqF6+frkE9-TO_Gc6qOcNzWbRXEDWvFqN0Op8diNP12uQ@mail.gmail.com>

On Thu, Sep 8, 2011 at 10:29 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Peter Otten wrote:
>
>> Classes and functions are grouped into
>> submodules by their functionality rather than employing Java's mechanical
>> one-class-per-file pattern.
>
> Surely it's an anti-pattern?

I don't think that's true; Java merely enforces one _public_ class per
source file. A file can have non-public classes, although one .class
file has only one class in it (so javac will sometimes make multiple
object files from one source file). I'm not wholly sure of the
significance of public classes, though, and whether or not it's
possible to do your logical grouping and just let them be non-public.

BTW, I am not a Java fan, and I don't have any defense prepared. I
haven't actually written any serious Java code for a number of years.
Used to use it back when IBM reckoned that Java would be the big thing
that sells OS/2.

ChrisA


From sahil at FreeBSD.org  Thu Sep  8 00:00:20 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Thu, 8 Sep 2011 00:00:20 -0400
Subject: Running Python Demo on the Web?
In-Reply-To: <d1496b92-b010-4499-9687-b13b9b6b52ac@glegroupsg2000goo.googlegroups.com>
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
	<d1496b92-b010-4499-9687-b13b9b6b52ac@glegroupsg2000goo.googlegroups.com>
Message-ID: <20110908040019.GH3046@magic.hamla.org>

On Wed, 2011-09-07 at 18:40:23 -0700, Laurent wrote:

> Neat. But I can see some "print(x)" and some "print x". What is the
> Python version?

See:

 http://docs.python.org/release/3.2.2/whatsnew/3.0.html#print-is-a-function
 http://www.python.org/dev/peps/pep-3105/

-- 
Sahil Tandon <sahil at FreeBSD.org>


From 1248283536 at qq.com  Thu Sep  8 00:24:15 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 8 Sep 2011 12:24:15 +0800
Subject: my  multi-download program can't finish
Message-ID: <tencent_0BE9496E443609034B36FE07@qq.com>

here is the program,

# basic structure,omit something
import Queue
 import httplib2
 import threading
 jobs = Queue.Queue()
name=something   #omit ,it is a web list to download
 for  x  in  name:
   jobs.put(x)
 
 def download():
     while not jobs.empty():
             try:
                 url = jobs.get()
                 hx = httplib2.Http()
                 resp, content = hx.request(url, headers=headers)
                 jobs.task_done()
             except:
                 print  "wrong" , url          
           
 if __name__ == '__main__':
    
     for i in range(10):
           threading.Thread(target=download).start()   
     jobs.join()

when it run ,it can download someting ,
it is strang:there is wrong output ,some web can't get,but  the program can't stop,it stay ,run ,can't fininsh,
i don't know why?
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From 1248283536 at qq.com  Thu Sep  8 00:50:52 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 8 Sep 2011 12:50:52 +0800
Subject: multi-down in threading module
Message-ID: <tencent_3D0134CB52460D7C4E91609E@qq.com>

i want to download data in  multiprocess ,i know the threading structure,but i can't finish it,
would you mind to revise it ?
any advice appreciated.
[code]
import urllib
import threading
URL = "http://download.finance.yahoo.com/d/quotes.csv?s=%s&f=sl1t1v&e=.csv"
symbols = ('GGP', 'JPM', 'AIG', 'AMZN','GGP', 'JPM', 'AIG', 'AMZN')
url =[ URL % '+'.join(sym)  for sym in symbols]

num=rang(3)  

def  down(url):
    print urllib.urlopen(url).read()
  
  
for i in num:   #these code  i can't finish 
    t=threading.Thread(target=down,args=  )
    threads.append(t)
  
  
for i in nmu:
    threads[i].start()
  

for i in num:
     threads[i].join()

[/code]
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From steve+comp.lang.python at pearwood.info  Thu Sep  8 01:08:38 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 08 Sep 2011 15:08:38 +1000
Subject: my  multi-download program can't finish
References: <mailman.865.1315455870.27778.python-list@python.org>
Message-ID: <4e684dd8$0$29970$c3e8da3$5496439d@news.astraweb.com>

On Thu, 8 Sep 2011 02:24 pm ???? wrote:

[...]
>              try:
>                  url = jobs.get()
>                  hx = httplib2.Http()
>                  resp, content = hx.request(url, headers=headers)
>                  jobs.task_done()
>              except:
>                  print  "wrong" , url

> when it run ,it can download someting ,
> it is strang:there is wrong output ,some web can't get,but  the program
> can't stop,it stay ,run ,can't fininsh, i don't know why?

If you read the helpful error messages that Python provides, instead of
hiding them and printing a useless message "wrong", you might find out why
the failures are happening.

Get rid of the try...except and see what exceptions you get. Then you will
be in a better situation to decide which exceptions should be caught, and
which are bugs that need to be fixed, and which should be allowed through.



-- 
Steven



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Message-ID: <1bceb162-850e-4ab8-bfe1-dc7658b8c7bc@r40g2000prf.googlegroups.com>


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From 1248283536 at qq.com  Thu Sep  8 03:46:55 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 8 Sep 2011 15:46:55 +0800
Subject: =?gbk?B?u9i4tKO6IG15ICBtdWx0aS1kb3dubG9hZCBwcm9n?=
	=?gbk?B?cmFtIGNhbid0IGZpbmlzaA==?=
Message-ID: <tencent_77B2FC0E3EB3B6C3184DE940@qq.com>

sometimes,the output is:
error: [Errno 104] Connection reset by peer 
------------------ ???? ------------------
???: "Steven D'Aprano"<steve+comp.lang.python at pearwood.info>;
????: 2011?9?8?(???) ??1:08
???: "python-list"<python-list at python.org>; 

??: Re: my  multi-download program can't finish

 
On Thu, 8 Sep 2011 02:24 pm ???? wrote:

[...]
>              try:
>                  url = jobs.get()
>                  hx = httplib2.Http()
>                  resp, content = hx.request(url, headers=headers)
>                  jobs.task_done()
>              except:
>                  print  "wrong" , url

> when it run ,it can download someting ,
> it is strang:there is wrong output ,some web can't get,but  the program
> can't stop,it stay ,run ,can't fininsh, i don't know why?

If you read the helpful error messages that Python provides, instead of
hiding them and printing a useless message "wrong", you might find out why
the failures are happening.

Get rid of the try...except and see what exceptions you get. Then you will
be in a better situation to decide which exceptions should be caught, and
which are bugs that need to be fixed, and which should be allowed through.



-- 
Steven

-- 
http://mail.python.org/mailman/listinfo/python-list
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From jenn.duerr at gmail.com  Thu Sep  8 03:59:41 2011
From: jenn.duerr at gmail.com (noydb)
Date: Thu, 8 Sep 2011 00:59:41 -0700 (PDT)
Subject: how to make fxn argument work with setting a field value
References: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
	<mailman.861.1315447873.27778.python-list@python.org>
Message-ID: <c95f57a0-1c55-45ea-9123-cb252e8657ae@i21g2000yqd.googlegroups.com>

> The documentation mentions "getValue" and "setValue":
>
> http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002z00...- Hide quoted text -
>
> - Show quoted text -

I have tried row.setValue(rankFld) = i for line 14.  Get syntax error
- cant assign to function call


From gandalf at shopzeus.com  Thu Sep  8 04:41:22 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 08 Sep 2011 10:41:22 +0200
Subject: Portable locale usage
In-Reply-To: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
References: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
Message-ID: <4E687FB2.9020908@shopzeus.com>


> I have set the system-wide locale to Croatian (Croatia)
> on my development system as instructed by:
> http://windows.microsoft.com/en-US/windows-vista/Change-the-system-locale
>
> Nevertheless, your proposal produces:
> ('English_United States','1252')
This is what I see on my Hungarian Windows:


C:\Users\User>python
Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit 
(AMD64)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import locale
 >>> locale.setlocale(locale.LC_ALL, '')
'Hungarian_Hungary.1250'
 >>> locale.getlocale()
('Hungarian_Hungary', '1250')
 >>>

So I'm 100% sure that the problem is with your system locale settings, 
not Python.

> Note that I would very much like
> to avoid changing the system locale
> (this requires Administrator password and system restart).
All right. But you understand, that Croatian ISO8859-2 is not supported 
on windows? So you will not be able to sort names with that under a 
windows system? (And it is not a limitation of Python.)
>> Why are you trying to force a specific locale to your program anyway?
> Because I wish to be able to correctly sort Croatian names.
Well, all right. If you want to sort Croatian names from a program that 
runs on an English (or whatever) system, then you will have to check the 
platform and use a locale that is supported by the platform. (But again, 
this is not Python's limitation. Python doesn't know what encodings are 
supported, in advance, and you cannot use a locale that is not supported...)
> I expect that most of my Windows users will not care
> to configure their computers with the national locale
> (and besides, that does not seem to work, anyway).
Croatian users will most likely use a Croatian Windows, out of the box. 
And on those systems, using locale.setlocale(locale.LC_ALL, '') will 
work perfectly. I'm not sure why it doesn't work on an English Windows 
with locale changed... I'm not a big fan of Windows, but I remember once 
I had to install a language pack for Windows before I could use a 
localized program. This might be what you need?

Best,

    Laszlo



From dan at tombstonezero.net  Thu Sep  8 05:51:58 2011
From: dan at tombstonezero.net (Dan Sommers)
Date: Thu, 8 Sep 2011 09:51:58 +0000 (UTC)
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.08.09.51.58@tombstonezero.net>

On Thu, 08 Sep 2011 10:29:26 +1000, Steven D'Aprano wrote:

> I suppose "one class per file" might be useful for those using an editor
> with no search functionality. Other than that, is there any
> justification for this rule? Any Java fans want to defend this?

Back in the dark ages known as the 1980s, we had a one-C-function-per-
file rule on a project with tens of thousands of C functions.  The big 
benefit was that we always knew which source file contained which 
function.  Computers could search a directory tree much more quickly than 
that much source code.  (The exception was the so-called Information 
Cluster, a collection of functions surrounding a data store, the 
predecessor to the modern day object-with-state and/or closure).

Not a Java fan'ly yours,
Dan



From egbertum at xs4all.nl  Thu Sep  8 05:55:02 2011
From: egbertum at xs4all.nl (egbert)
Date: Thu, 8 Sep 2011 11:55:02 +0200
Subject: DRY and class variables
Message-ID: <20110908095502.GA3637@xs4all.nl>

My classes correspond to sql tables.
In these classes I want to have several class variables
that refer to data that are common to all instances.

The assignment statements for the class variables are the same
in all classes, except that of these instructions needs the name
of the class itself. That name is used to read a file with meta-data.

So what I have now is something like this (simplified):

class TableOne(object):
    m = Metadata('TableOne')
    m.do_something()
    def __init__(self):
        etc

class TableTwo(object):
    m = Metadata('TableTwo')
    m.do_something()
    def __init__(self):
        etc

I have tried:
- to eliminate the class name argument, but in this phase of the
  object creation __class__ and __name__ are not available
- to move the two statements to a superclass, but the class variables
  come in the superclass namespace, not in the subclass namespace.

Any ideas ?
e
-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From tartley at tartley.com  Thu Sep  8 06:22:05 2011
From: tartley at tartley.com (Jonathan Hartley)
Date: Thu, 8 Sep 2011 03:22:05 -0700 (PDT)
Subject: How to structure packages
In-Reply-To: <4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <f25f8cd3-d70a-474d-b569-a99222c8f5f0@glegroupsg2000goo.googlegroups.com>

On Thursday, September 8, 2011 1:29:26 AM UTC+1, Steven D&#39;Aprano wrote:
> Steven D'Aprano wrote:
> 
> Other than that, is there any justification
> for this rule? Any Java fans want to defend this?
>
> If "one class per file", why not "one method per class" too? Why is the
> second rule any more silly than the first?


Hey. I'm not a Java fan but I'll give it a go.

One method per class is not a good idea because a class is a bunch of code that forms a coherent conceptual bundle of functionality. Often, to provide such a bundle, it requires more than one method. To split these methods across several classes would be splitting up a single coherent entity, which makes it harder to understand the purpose and identity of the entity, and more fiddly to delineate the boundary between one such entity and the next.

On the other hand, IMHO one class per file is often a good idea. Since a class is a single coherent bundle, then the natural way to split a program into files is often to divide it into these same coherent bundles. Sometimes you have two or more classes that are conceptually very tightly coupled, and it makes sense to gather them up into a single file. However, for me, this is the exception rather than the rule, so in the general case, I usually end up with code that has one class per file. It's only a rule-of-thumb though, and should be broken whenever it seems appropriate.


From t at jollybox.de  Thu Sep  8 06:22:33 2011
From: t at jollybox.de (Thomas Jollans)
Date: Thu, 08 Sep 2011 12:22:33 +0200
Subject: DRY and class variables
In-Reply-To: <20110908095502.GA3637@xs4all.nl>
References: <20110908095502.GA3637@xs4all.nl>
Message-ID: <4E689769.3050701@jollybox.de>

On 08/09/11 11:55, egbert wrote:
> My classes correspond to sql tables.
> In these classes I want to have several class variables
> that refer to data that are common to all instances.
> 
> The assignment statements for the class variables are the same
> in all classes, except that of these instructions needs the name
> of the class itself. That name is used to read a file with meta-data.
> 
> So what I have now is something like this (simplified):
> 
> class TableOne(object):
>     m = Metadata('TableOne')
>     m.do_something()
>     def __init__(self):
>         etc
> 
> class TableTwo(object):
>     m = Metadata('TableTwo')
>     m.do_something()
>     def __init__(self):
>         etc
> 
> I have tried:
> - to eliminate the class name argument, but in this phase of the
>   object creation __class__ and __name__ are not available
> - to move the two statements to a superclass, but the class variables
>   come in the superclass namespace, not in the subclass namespace.
> 
> Any ideas ?

You should be able to do this with a metaclass (almost certainly
overkill), or with a class decorator (Python 2.6+):

def with_metadata (cls):
    cls.m = Metadata (cls.__name__)
    cls.m.do_something ()
    return cls

@with_metadata
class TableOne:
   # foo
   pass



From adam.jorgensen.za at gmail.com  Thu Sep  8 06:30:21 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Thu, 8 Sep 2011 12:30:21 +0200
Subject: [Python-ideas] relaxing keyword usage restrictions
In-Reply-To: <j48nkf$7eq$1@dough.gmane.org>
References: <CANWsHyfzh0Ng_YnJWdH5W3PA6AmnWa7MNGJrPSyk6O=t_bhyPg@mail.gmail.com>
	<e0f505b7-af03-4e43-8303-ec14802f7958@email.android.com>
	<CADiSq7djjn1vPWXjmAffRyi6gGxq=iNUf10RtLZY0PgRwEptwA@mail.gmail.com>
	<20110906164103.772ed18b@resist.wooz.org>
	<CADiSq7dmq7F6Gv0pd2444mjfQs1yG6f24LjWW78aWy9iPxdZGQ@mail.gmail.com>
	<20110906183346.2bcdfbf8@resist.wooz.org>
	<CADiSq7eDu2JL=3Gt_VY3aQ9g4+aWH1pCtc_BVun5W3OVcj43BA@mail.gmail.com>
	<20110906215717.62adf161@resist.wooz.org>
	<CADiSq7dU3m0QP2Pd+HYt0P936XSbAPfMkY_oLYSXFvYsvuFmmQ@mail.gmail.com>
	<j48nkf$7eq$1@dough.gmane.org>
Message-ID: <CAMX1RonN09xm+XAOo+HH5YGkoc-8N4sQrkvjUMux7y7Xbc0LQA@mail.gmail.com>

About the only keyword I can think of this being even slightly useful for
would be class and even then I think that clazz is a pretty acceptable
substitute.
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From piet at vanoostrum.org  Thu Sep  8 06:53:45 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 12:53:45 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
	<mailman.779.1315244354.27778.python-list@python.org>
Message-ID: <m2r53rb8zq.fsf@cochabamba.vanoostrum.org>

Terry Reedy <tjreedy at udel.edu> writes:

> Indexing objects by their internal id is usually useless. 

obj.id is not the internal id. 
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From piet at vanoostrum.org  Thu Sep  8 07:01:10 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 13:01:10 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
	<f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>
	<9cmq1vFk6fU1@mid.individual.net>
	<mailman.809.1315328739.27778.python-list@python.org>
	<9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
	<d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>
	<9cpbddFtidU1@mid.individual.net>
	<m2zkigartn.fsf@cochabamba.vanoostrum.org>
	<9cqdb0Fpn4U1@mid.individual.net>
Message-ID: <m2mxefb8nd.fsf@cochabamba.vanoostrum.org>

"Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:

> "Piet van Oostrum" <piet at vanoostrum.org> wrote in message 
> news:m2zkigartn.fsf at cochabamba.vanoostrum.org...
>> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>>
>>
>>> INFO:DAVServer.fshandler:get_data: d:\webdav not found
>>> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1>
>>> Gecko/
>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1>
>>> Gecko/
>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>>
>> From the log it looks like you are trying to access the server with the
>> url:
>>
>> http://localhost:8008/ or something similar.
>
> Yes, I do.
>
>> This won't work as you would try to access the root of your webdav
>> directory in this way (i.e. D:/webdav). The webdav server can only serve
>> files, not directories, so you would have to access
>> http://localhost:8008/somefile.txt where somefile.txt is a file in
>> D:/webdav.
>
> OK, thanks. I am not familiar to WebDAV.
> I tried. Got something different (at least something happened):
> "Setuptools version 0.6c9 or greater has been installed.
> (Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"
>
> Wasn't able to find ez_setup.py yet.
>
Google for it and install.

But I don't understand. You already had WebDav installed, so why do you
need ez_setup.py?

>> This only applies to acces using a browser. If you access the server
>> through a webdav-aware client (for example the Finder on Mac OS X, or
>> probably the Windows Explorer) it can serve the contents of the directory.
>> -- 
>
> Thanks. I am just trying to use a calendar with a webdav server. I don't 
> have any experience with that.
> Simply using my browser to try it out.

Did you try the calendar with the WebDav server running?
Dit you put a file in D:\webdav and try to get it with the browser?

-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From rosuav at gmail.com  Thu Sep  8 08:12:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 8 Sep 2011 22:12:59 +1000
Subject: lfun and such
In-Reply-To: <4E68B08D.2090800@dirix.nu>
References: <4E68AC0D.6010007@dirix.nu>
	<4E68B08D.2090800@dirix.nu>
Message-ID: <CAPTjJmowps81-7fEVBOqHy8N8RB+CCSfdA+2b6sV_yHWbYtpJg@mail.gmail.com>

On Thu, Sep 8, 2011 at 10:09 PM, Marc Dirix <marc at dirix.nu> wrote:
> scratch that.
>
> Silly me.
>

Heh. I'm curious now as to what was wrong, but am glad it's all
working! I just switched back from my test run where I made a minimal
class implementing `[]() and `[]=() to see if there was something
weirdly wrong.

ChrisA


From simoncropper at fossworkflowguides.com  Thu Sep  8 08:26:31 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Thu, 08 Sep 2011 22:26:31 +1000
Subject: Create an index from a webpage
Message-ID: <4E68B477.9020703@fossworkflowguides.com>

Hi,

I am getting dizzy on google.

I am after a way of pointing a python routine to my website and have it 
create a tree, represented as a hierarchical HTML list in a webpage, of 
all the pages in that website (recursive list of internal links to HTML 
documents; ignore images, etc.).

It is essentially a contents page or sitemap for the site.

Interestingly, despite trying quite a few keyword combinations, I was 
unable to find such a script.

Anyone have any ideas?

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From PointedEars at web.de  Thu Sep  8 08:38:53 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Thu, 08 Sep 2011 14:38:53 +0200
Subject: Create an index from a webpage
References: <mailman.874.1315484806.27778.python-list@python.org>
Message-ID: <1537032.qVoOGUtdWV@PointedEars.de>

Simon Cropper wrote:

> I am after a way of pointing a python routine to my website and have it
> create a tree, represented as a hierarchical HTML list in a webpage, of
> all the pages in that website (recursive list of internal links to HTML
> documents; ignore images, etc.).
> 
> It is essentially a contents page or sitemap for the site.

<http://lmgtfy.com/?q=python+sitemap>

If all else fails, use markup parsers like 

- <http://www.crummy.com/software/BeautifulSoup/>
- <http://lxml.de/>

and write it yourself.  It is not hard to do.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From fnautaNO at SPAMiae.nl  Thu Sep  8 09:57:48 2011
From: fnautaNO at SPAMiae.nl (Fokke Nauta)
Date: Thu, 8 Sep 2011 15:57:48 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net><mailman.823.1315377607.27778.python-list@python.org><9cor4gFk15U1@mid.individual.net><d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com><9cpbddFtidU1@mid.individual.net><m2zkigartn.fsf@cochabamba.vanoostrum.org><9cqdb0Fpn4U1@mid.individual.net>
	<m2mxefb8nd.fsf@cochabamba.vanoostrum.org>
Message-ID: <9crvuvFpt2U1@mid.individual.net>

"Piet van Oostrum" <piet at vanoostrum.org> wrote in message 
news:m2mxefb8nd.fsf at cochabamba.vanoostrum.org...
> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>
>> "Piet van Oostrum" <piet at vanoostrum.org> wrote in message
>> news:m2zkigartn.fsf at cochabamba.vanoostrum.org...
>>> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>>>
>>>
>>>> INFO:DAVServer.fshandler:get_data: d:\webdav not found
>>>> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1>
>>>> Gecko/
>>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>>> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1>
>>>> Gecko/
>>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>>>
>>> From the log it looks like you are trying to access the server with the
>>> url:
>>>
>>> http://localhost:8008/ or something similar.
>>
>> Yes, I do.
>>
>>> This won't work as you would try to access the root of your webdav
>>> directory in this way (i.e. D:/webdav). The webdav server can only serve
>>> files, not directories, so you would have to access
>>> http://localhost:8008/somefile.txt where somefile.txt is a file in
>>> D:/webdav.
>>
>> OK, thanks. I am not familiar to WebDAV.
>> I tried. Got something different (at least something happened):
>> "Setuptools version 0.6c9 or greater has been installed.
>> (Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"
>>
>> Wasn't able to find ez_setup.py yet.
>>
> Google for it and install.

I did.

> But I don't understand. You already had WebDav installed, so why do you
> need ez_setup.py?

Well, that was my mistake. I entered in the browser 
http://10.0.0.140:8081/a.txt (one of the textfiles in the directory 
d:\webdav on the server) and got the message:
"Setuptools version 0.6c9 or greater has been installed.
(Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"

At first I thought this came from the webdav server. That's why I searched 
for the ez_setup.py script. Once it was there, I ran it.
It took me some time before I realized it was the actual content of the 
document a.txt on the webdav server what I saw. So it worked! Different that 
I expected, but it works.

>>> This only applies to acces using a browser. If you access the server
>>> through a webdav-aware client (for example the Finder on Mac OS X, or
>>> probably the Windows Explorer) it can serve the contents of the 
>>> directory.
>>> -- 
>>
>> Thanks. I am just trying to use a calendar with a webdav server. I don't
>> have any experience with that.
>> Simply using my browser to try it out.
>
> Did you try the calendar with the WebDav server running?

Not yet. The next step is the calendar.

> Dit you put a file in D:\webdav and try to get it with the browser?

Yes, and that worked! I am able to see the contents of text files.
In my unfamiliarity with WebDAV I expected to open the directory and see the 
files in there.

Many thanks for your help.

Fokke




From fnautaNO at SPAMiae.nl  Thu Sep  8 10:10:37 2011
From: fnautaNO at SPAMiae.nl (Fokke Nauta)
Date: Thu, 8 Sep 2011 16:10:37 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
Message-ID: <9cs0mvFoaU1@mid.individual.net>

"Fokke Nauta" <fnautaNO at SPAMsolfon.nl> wrote in message 
news:9c4trjFcfmU1 at mid.individual.net...
> Hi all,
>
> I am completely new to Python, but I'm confronted with a problem I can't 
> solve.
> This is my question:
>
> I'm running a PC with XP Pro32, which acts as a file server/print 
> server/FTP server and web server. The web server is facilitated by the 
> Aprelium Abyss X2 server, and has Perl and PHP support on http and https. 
> It all works fine.
> To do some research with some calender systems and to share the Outlook 
> calendar I need a WebDAV server. After googling I found the Python WebDAV 
> server.
> I installed Python 3.2.1 and extracted the packages PyWebDAV and PyXML. 
> Now I have a working Python app and 2 directories called PyWebDAV-0.9.4.1 
> and PyXML-0.8.4. In the PyWebDAV README it says:
>
> Installation and setup of server can be as easy as follows:
>
> $ easy_install PyWebDAV
> $ davserver -D /tmp -n -J
>
> But of course it doesn't work like that. When I start up Python GUI I see 
> the ">>>" prompt instead of the "$" prompt. But where do I place the two 
> directories? And there is no easy_install script in the PyXML-0.8.4 
> directory, only a setup.py and ez_setup.py script. I guess the latter is 
> the one to use. But how?
>
> How do I proceed next?
>
> Any help will be appreciated.
> Thanks in advance.
>
> With regards,
> Fokke Nauta
>

I have my webdav server up and running.

Many thanks for all who contributed to solving this problem.

With regards,
Fokke Nauta 




From wolftracks at invalid.com  Thu Sep  8 10:10:54 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Thu, 08 Sep 2011 07:10:54 -0700
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <mailman.778.1315240645.27778.python-list@python.org>
References: <j42p3q$poq$1@dont-email.me> <j42sk7$lnj$1@dont-email.me>
	<j42t0r$oht$1@dont-email.me>
	<mailman.778.1315240645.27778.python-list@python.org>
Message-ID: <j4aifj$4c2$1@dont-email.me>

On 9/5/2011 9:36 AM, Colin J. Williams wrote:
> On 05-Sep-11 12:22 PM, Dan Nagle wrote:
>> Hello,
>>
>> On 2011-09-05 16:15:20 +0000, W. eWatson said:
>>
>>> On 9/5/2011 8:24 AM, Chris Angelico wrote:
>>>> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>
>>>> wrote:
>>>>> See Subject.
>>
>> <snip>
>>
>>>>> To what extent "familiar"? I have it installed on several computers,
>>>> but only because it comes with Open Wat C/C++.
>>>>
>>>> With something off-topic like this,
>>
>> <snip>
>>
>>>> sierra_mtnview @ sbcglobal.net
>>> Here's the story.
>>>
>>> As far as I can tell F77 1.8 is not available. I've Googled quite a
>>> bit for it. My source for 1.9 is
>>> <http://www.openwatcom.org/index.php/Download>. It gives me:
>>> open-watcom-f77-win32-1.9.exe.
>>
>> On Usenet, comp.lang.fortran might be the best source of help for this.
>> There's a good chance one of the regulars there can answer you
>> within one or two posts. (I'll not cross-post, you can choose for
>> yourself.)
>>
>> HTH
>>
>
> You might get in touch with someone at Waterloo University, which is
> located in Kitchener/Waterloo.
>
> This could have come from the 60's or 70's.
>
> Good luck.
>
> Colin W.
>
Left a message on Tuesday. No return call. I'm starting to make progress 
on this.


From 1248283536 at qq.com  Thu Sep  8 10:12:19 2011
From: 1248283536 at qq.com (=?utf-8?B?YWxpYXM=?=)
Date: Thu, 8 Sep 2011 22:12:19 +0800
Subject: wrap  the queue  to  multiprocess  download
Message-ID: <tencent_4166F0FA34A3622828C18134@qq.com>

here is my part of program,you can see main structure,i want to wrap it in class ,
class   webdata(object):
    def  __init__(self,arg):
        jobs = Queue.Queue()
        for  x  in  name:
            jobs.put(self.url)
                
    
          
    def download(self):
        while not self.jobs.empty():
            url = self.jobs.get()
            hx = httplib2.Http()
            resp, content = hx.request(url, headers=headers).read()
            self.jobs.task_done()


    def  myrun(self):
        for i in range(30):
              threading.Thread(target=self.download).start()
        self.jobs.join()
    
if  __name__=="__main__":

    s=webdata('quote')
    s.myrun()

when it run ,the output is  :
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/pengtao/workspace/try.py", line 75, in download
    resp, content = hx.request(url, headers=headers).read()
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1288, in request
    (scheme, authority, request_uri, defrag_uri) = urlnorm(uri)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 201, in urlnorm
    (scheme, authority, path, query, fragment) = parse_uri(uri)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 197, in parse_uri
    groups = URI.match(uri).groups()
TypeError: expected string or buffer


when i use the same  structrue, don't   wrap it ,it can run .
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From nospam at torek.net  Thu Sep  8 10:21:23 2011
From: nospam at torek.net (Chris Torek)
Date: 8 Sep 2011 14:21:23 GMT
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.854.1315441399.27778.python-list@python.org>
Message-ID: <j4aj1302fg0@news3.newsguy.com>

In article <mailman.854.1315441399.27778.python-list at python.org>
Cameron Simpson  <cs at zip.com.au> wrote:
>Facilities like feof() in C and eof in Pascal already lead to lots of
>code that runs happily with flat files and behaves badly in interactive
>or piped input. It is _so_ easy to adopt a style like:
>
>  while not eof(filehandle):
>    line = filehandle.nextline()
>    ...

Minor but important point here: eof() in Pascal is predictive (uses
a "crystal ball" to peer into the future to see whether EOF is is
about to occur -- which really means, reads ahead, causing that
interactivity problem you mentioned), but feof() in C is "post-dictive".
The feof(stream) function returns a false value if the stream has
not yet encountered an EOF, but your very next attempt to read from
it may (or may not) immediately encounter that EOF.

Thus, feof() in C is sort of (but not really) useless.  (The actual
use cases are to distinguish between "EOF" and "error" after a
failed read from a stream -- since C lacks exceptions, getc() just
returns EOF to indicate "failed to get a character due to end of
file or error" -- or in some more obscure cases, such as the
nonstandard getw(), to distinguish between a valid -1 value and
having encountered an EOF.  The companion ferror() function tells
you whether an earlier EOF value was due to an error.)
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From rosuav at gmail.com  Thu Sep  8 10:26:03 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 00:26:03 +1000
Subject: wrap the queue to multiprocess download
In-Reply-To: <tencent_4166F0FA34A3622828C18134@qq.com>
References: <tencent_4166F0FA34A3622828C18134@qq.com>
Message-ID: <CAPTjJmoBuuzhb7s6WPeiSVKUWwpVO5LoYaJJLp21x8n6E9Jc=Q@mail.gmail.com>

On Fri, Sep 9, 2011 at 12:12 AM, alias <1248283536 at qq.com> wrote:
> ??? def? __init__(self,arg):
> ??????? for? x? in? name:
>
> ??? s=webdata('quote')

What you're doing here is iterating over the letters in the string
'quote'. It's adding one job for each letter. Is that your intention?

ChrisA


From python at mrabarnett.plus.com  Thu Sep  8 11:06:11 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 16:06:11 +0100
Subject: how to make fxn argument work with setting a field value
In-Reply-To: <c95f57a0-1c55-45ea-9123-cb252e8657ae@i21g2000yqd.googlegroups.com>
References: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
	<mailman.861.1315447873.27778.python-list@python.org>
	<c95f57a0-1c55-45ea-9123-cb252e8657ae@i21g2000yqd.googlegroups.com>
Message-ID: <4E68D9E3.8060403@mrabarnett.plus.com>

On 08/09/2011 08:59, noydb wrote:
>> The documentation mentions "getValue" and "setValue":
>>
>> http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002z00...- Hide quoted text -
>>
>> - Show quoted text -
>
> I have tried row.setValue(rankFld) = i for line 14.  Get syntax error
> - cant assign to function call

Of course you can't assign to a function call!

It's:

     row.setValue(rankFld, value)

and:

     value = row.getValue(rankFld)


From steve+comp.lang.python at pearwood.info  Thu Sep  8 11:11:28 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 01:11:28 +1000
Subject: Create an index from a webpage
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
Message-ID: <4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>

Thomas 'PointedEars' Lahn wrote:

> <http://lmgtfy.com/?q=python+sitemap>

[climbs up on the soapbox and begins rant]

Please don't use lmgtfy. The joke, such as it is, stopped being funny about
three years ago. It's just annoying, and besides, it doesn't even work
without Javascript. Kids today have no respect, get off my lawn, grump
grump grump...

It's no harder to put the search terms into a google URL, which still gets
the point across without being a dick about it:

www.google.com/search?q=python+sitemap

[ends rant, climbs back down off soapbox]

Or better still, use a search engine that doesn't track and bubble your
searches:

https://duckduckgo.com/html/?q=python+sitemap

You can even LMDDGTFY if you insist.

http://lmddgtfy.com/


Completely-undermining-my-own-message-ly y'rs, 


-- 
Steven



From python at mrabarnett.plus.com  Thu Sep  8 11:25:53 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 16:25:53 +0100
Subject: my  multi-download program can't finish
In-Reply-To: <tencent_0BE9496E443609034B36FE07@qq.com>
References: <tencent_0BE9496E443609034B36FE07@qq.com>
Message-ID: <4E68DE81.5060809@mrabarnett.plus.com>

On 08/09/2011 05:24, ???? wrote:
> here is the program,
>
> # basic structure,omit something
> import Queue
> import httplib2
> import threading
> jobs = Queue.Queue()
> name=something   #omit ,it is a web list to download
> for  x  in  name:
>   jobs.put(x)
>
> def download():
>     while not jobs.empty():
>             try:
>                 url = jobs.get()
>                 hx = httplib2.Http()
>                 resp, content = hx.request(url, headers=headers)
>                 jobs.task_done()
>             except:
>                 print  "wrong" , url
>
> if __name__ == '__main__':
>
>     for i in range(10):
>           threading.Thread(target=download).start()
>     jobs.join()
>
> when it run ,it can download someting ,
> it is strang:there is wrong output ,some web can't get,but  the 
> program can't stop,it stay ,run ,can't fininsh,
> i don't know why?
>
The line:

jobs.join()

will wait until every job has been marked as done by:

jobs.task_done()

In function "download", if there's an exception, it will go to the 
exception handler and print a message, but there's no:

jobs.task_done()

there to tell the queue that the job has been done.

You need to tell it when a job has been processed. It doesn't care 
whether a job succeeded or failed, only whether it has been processed.


From ssegvic at zemris.fer.hr  Thu Sep  8 11:39:42 2011
From: ssegvic at zemris.fer.hr (=?utf-8?Q?Sini=C5=A1a_=C5=A0egvi=C4=87?=)
Date: Thu, 8 Sep 2011 17:39:42 +0200 (CEST)
Subject: Portable locale usage
In-Reply-To: <4E687FB2.9020908@shopzeus.com>
Message-ID: <1468943535.28842.1315496382655.JavaMail.root@mail.zemris.fer.hr>

> From: "Laszlo Nagy" <gandalf at shopzeus.com>
> To: "Sini?a ?egvi?" <ssegvic at zemris.fer.hr>, python-list at python.org
> Sent: Thursday, September 8, 2011 10:41:22 AM
> Subject: Re: Portable locale usage
> > I have set the system-wide locale to Croatian (Croatia)
> > on my development system as instructed by:
> > http://windows.microsoft.com/en-US/windows-vista/Change-the-system-locale
> >
> > Nevertheless, your proposal produces:
> > ('English_United States','1252')
> This is what I see on my Hungarian Windows:
> 
> 
> C:\Users\User>python
> Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit
> (AMD64)] on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import locale
> >>> locale.setlocale(locale.LC_ALL, '')
> 'Hungarian_Hungary.1250'
> >>> locale.getlocale()
> ('Hungarian_Hungary', '1250')
> >>>
> 
> So I'm 100% sure that the problem is with your system locale settings,
> not Python.

I've just found out how to set the user locale on Windows.

One has to go to Control panel -> Regional and language options,
then select the tab named Formats, and finally 
set the box Current format to the desired language, 
which is in my case Croatian (Croatia).

The whole tab says nothing about locales, I found this by try and test.
This recipe is not affected by the system locale (which I was setting before)!

Now locale.setlocale(locale.LC_ALL, '') sets the Croatian locale.

> > I expect that most of my Windows users will not care
> > to configure their computers with the national locale
> > (and besides, that does not seem to work, anyway).
> Croatian users will most likely use a Croatian Windows, out of the
> box.
> And on those systems, using locale.setlocale(locale.LC_ALL, '') will
> work perfectly. 

Yes it's true, you were right, I was setting 
the Croatian language at the wrong place
(I am not a Windows fan neither, I normally work on Linux).

However, I am not completely happy with this.
OK, no need for system restart, but still,
it would be nice if Python program could
manage around this by itself, 
of course, provided that the required locale is installed.

> > Note that I would very much like
> > to avoid changing the system locale
> > (this requires Administrator password and system restart).
> All right. But you understand, that Croatian ISO8859-2 is not
> supported on windows? 

Yes I do understand that.

I have commented that the Python's locale aliasing engine
should not propose iso8859-2 on Windows systems,
exactly for the reason you mention.


> >> Why are you trying to force a specific locale to your program
> >> anyway?
> > Because I wish to be able to correctly sort Croatian names.
> Well, all right. If you want to sort Croatian names from a program that
> runs on an English (or whatever) system, then you will have to check the
> platform and use a locale that is supported by the platform. (But again,
> this is not Python's limitation. Python doesn't know what encodings are
> supported, in advance, and you cannot use a locale that is not supported...)

I fully agree.

I commented that, if a proper locale is installed,
the following should work on any system:

locale.setlocale(locale.LC_ALL, ('hr', locale.getpreferredencoding())) 

Currently the above does not work on Windows,
and that is because the locale_alias for 'hr'
is bound to 'hr_HR.ISO8859-2'.
Check the source: .../Python-3.2.2/Lib/locale.py, line 537

I was arguing that, on a Windows system, 
the locale_alias for 'hr' should be bound 
to 'Croatian_Croatia.1250'.

Cheers,

Sinisa


From ericsnowcurrently at gmail.com  Thu Sep  8 12:44:04 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Thu, 8 Sep 2011 10:44:04 -0600
Subject: DRY and class variables
In-Reply-To: <20110908095502.GA3637@xs4all.nl>
References: <20110908095502.GA3637@xs4all.nl>
Message-ID: <CALFfu7DTu_BuHJiHxOxT2RkqbXp0nrqw62JZN5cu7zrHUizE9A@mail.gmail.com>

On Thu, Sep 8, 2011 at 3:55 AM, egbert <egbertum at xs4all.nl> wrote:
> My classes correspond to sql tables.
> In these classes I want to have several class variables
> that refer to data that are common to all instances.
>
> The assignment statements for the class variables are the same
> in all classes, except that of these instructions needs the name
> of the class itself. That name is used to read a file with meta-data.
>
> So what I have now is something like this (simplified):
>
> class TableOne(object):
> ? ?m = Metadata('TableOne')
> ? ?m.do_something()
> ? ?def __init__(self):
> ? ? ? ?etc
>
> class TableTwo(object):
> ? ?m = Metadata('TableTwo')
> ? ?m.do_something()
> ? ?def __init__(self):
> ? ? ? ?etc
>
> I have tried:
> - to eliminate the class name argument, but in this phase of the
> ?object creation __class__ and __name__ are not available
> - to move the two statements to a superclass, but the class variables
> ?come in the superclass namespace, not in the subclass namespace.
>
> Any ideas ?

Definitely an interesting problem I've run into before.  Here are two solutions:

1. in Python 3, use the metaclass __prepare__()  (see
http://code.activestate.com/recipes/577813/);
2. in Python 2 or 3, use a descriptor to defer creating your Metadata
objects until after the class object is available (see
http://code.activestate.com/recipes/577745/).

HTH

-eric

> e
> --
> Egbert Bouwman - Keizersgracht 197 II - 1016 DS ?Amsterdam - 020 6257991
> ========================================================================
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tavares at fe.up.pt  Thu Sep  8 15:29:57 2011
From: tavares at fe.up.pt (tavares at fe.up.pt)
Date: Thu, 8 Sep 2011 12:29:57 -0700 (PDT)
Subject: =?windows-1252?Q?Symposium_=93Experimental_and_Computational_Bio=2DImag?=
	=?windows-1252?Q?ing_and_Visualization=94_within_ICEM15_=96_Announce_=26_Call_f?=
	=?windows-1252?Q?or_Papers?=
Message-ID: <839676a0-6525-4d74-8232-205ca9100001@cd4g2000vbb.googlegroups.com>

Dear Colleague,

Within the 15th International Conference on Experimental Mechanics
(ICEM15), to be held in Faculty of Engineering, University of Porto,
Porto, Portugal, in July 22-27, 2012, (www.fe.up.pt/clme/icem15/
index.htm), we are organizing a Symposium on ?Experimental and
Computational Bio-Imaging and Visualization?.
The main goal of the Symposium ?Experimental and Computational Bio-
Imaging and Visualization? is to bring together researchers,
developers and clinicians involved in the related fields of Bio-
Imaging and Visualization, including Biomechanics, Experimental
Biomechanics, Image Processing and Analysis, Medical Imaging,
Mechanobiology, Tissues Engineering, Scientific Visualization and
Software and Hardware Development, in order to set the major lines of
development for the near future and establish a bridge between them.

INSTRUCTIONS & SUBMISSION:

- For instructions and submission, please access to the conference
website at:
www.fe.up.pt/clme/icem15/index.htm;
- Please, note that, when submitting your work, you should indicate
the Symposium ?Experimental and Computational Bio-Imaging and
Visualization?.

IMPORTANT DATES:

- Submission of abstracts: 30 November, 2011;
- Notification of acceptance: 13 January, 2012;
- Submission of full-papers: 16 March, 2012.

Kind regards,

Jo?o Manuel R. S. Tavares (University of Porto, Portugal,
tavares at fe.up.pt)
Yongjie Zhang (Carnegie Mellon University, USA,
jessicaz at andrew.cmu.edu)
(Symposium organizers)


From georgeryoung at gmail.com  Thu Sep  8 15:51:17 2011
From: georgeryoung at gmail.com (gry)
Date: Thu, 8 Sep 2011 12:51:17 -0700 (PDT)
Subject: replace random matches of regexp
Message-ID: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>

[Python 2.7]
I have a body of text (~1MB) that I need to modify.   I need to look
for matches of a regular expression and replace a random selection of
those matches with a new string.  There may be several matches on any
line, and a random selection of them should be replaced.  The
probability of replacement should be adjustable.  Performance is not
an issue.  E.g: if I have:

SELECT max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
(PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON (ceil(0.46)
=sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I) =
sqrt((0.02 + PUBLIC_TT_1.F))) OR

I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
only with probability 0.7.  I looked and looked for some computed
thing in re's that I could stick and expression, but could not find
such(for good reasons, I know).
Any ideas how to do this?  I would go for simple, even if it's wildly
inefficient, though elegance is always admired...


From python at mrabarnett.plus.com  Thu Sep  8 16:12:34 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 21:12:34 +0100
Subject: replace random matches of regexp
In-Reply-To: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <4E6921B2.2010300@mrabarnett.plus.com>

On 08/09/2011 20:51, gry wrote:
> [Python 2.7]
> I have a body of text (~1MB) that I need to modify.   I need to look
> for matches of a regular expression and replace a random selection of
> those matches with a new string.  There may be several matches on any
> line, and a random selection of them should be replaced.  The
> probability of replacement should be adjustable.  Performance is not
> an issue.  E.g: if I have:
>
> SELECT max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
> PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
> PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
> (PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON (ceil(0.46)
> =sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I) =
> sqrt((0.02 + PUBLIC_TT_1.F))) OR
>
> I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
> only with probability 0.7.  I looked and looked for some computed
> thing in re's that I could stick and expression, but could not find
> such(for good reasons, I know).
> Any ideas how to do this?  I would go for simple, even if it's wildly
> inefficient, though elegance is always admired...

re.sub can accept a function as the replacement. It'll call the
function when it finds a match, and the string returned by that
function will be the replacement.

You could write a function which returns either the original substring
which was found or a different substring.


From ndparker at gmail.com  Thu Sep  8 16:18:00 2011
From: ndparker at gmail.com (=?UTF-8?B?QW5kcsOp?= Malo)
Date: Thu, 08 Sep 2011 22:18:00 +0200
Subject: replace random matches of regexp
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <10875052.MZNQO6iqsQ@news.perlig.de>

* gry wrote:

> I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
> only with probability 0.7.  I looked and looked for some computed
> thing in re's that I could stick and expression, but could not find
> such(for good reasons, I know).
> Any ideas how to do this?  I would go for simple, even if it's wildly
> inefficient, though elegance is always admired...

You can run a re.sub() with a function as replacement value. This function
then either returns the replacement or the original match based on a
weighted random value.

nd
-- 
"Umfassendes Werk (auch fuer Umsteiger vom Apache 1.3)"
                                          -- aus einer Rezension

<http://pub.perlig.de/books.html#apache2>


From __peter__ at web.de  Thu Sep  8 16:43:15 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 08 Sep 2011 22:43:15 +0200
Subject: replace random matches of regexp
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <j4b9cs$ebv$1@dough.gmane.org>

gry wrote:

> [Python 2.7]
> I have a body of text (~1MB) that I need to modify.   I need to look
> for matches of a regular expression and replace a random selection of
> those matches with a new string.  There may be several matches on any
> line, and a random selection of them should be replaced.  The
> probability of replacement should be adjustable.  Performance is not
> an issue.  E.g: if I have:
> 
> SELECT max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
> PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
> PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
> (PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON (ceil(0.46)
> =sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I) =
> sqrt((0.02 + PUBLIC_TT_1.F))) OR
> 
> I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
> only with probability 0.7.  I looked and looked for some computed
> thing in re's that I could stick and expression, but could not find
> such(for good reasons, I know).
> Any ideas how to do this?  I would go for simple, even if it's wildly
> inefficient, though elegance is always admired...

def make_sub(text, probability):
    def sub(match):
        if random.random() < probability:
            return text + match.group(1)
        return match.group(1)
    return sub

print re.compile("(max|min|cos|sqrt|ceil)").sub(make_sub(r"public.", .7), 
sample)

or even

def make_sub(text, probability):
    def sub(match):
        if random.random() < probability:
            def group_sub(m):
                return match.group(int(m.group(1)))
            return re.compile(r"[\\](\d+)").sub(group_sub, text)
        return match.group(0)
    return sub

print re.compile("(max|min|cos|sqrt|ceil)").sub(make_sub(r"public.\1", .7), 
sample)




From egbertum at xs4all.nl  Thu Sep  8 16:53:35 2011
From: egbertum at xs4all.nl (egbert)
Date: Thu, 8 Sep 2011 22:53:35 +0200
Subject: DRY and class variables
In-Reply-To: <4E689769.3050701@jollybox.de>
References: <20110908095502.GA3637@xs4all.nl>
 <4E689769.3050701@jollybox.de>
Message-ID: <20110908205335.GA18306@xs4all.nl>

On Thu, Sep 08, 2011 at 12:22:33PM +0200, Thomas Jollans wrote:
> You should be able to do this with a metaclass (almost certainly
> overkill), or with a class decorator (Python 2.6+):
> 
> def with_metadata (cls):
>     cls.m = Metadata (cls.__name__)
>     cls.m.do_something ()
>     return cls
> 
> @with_metadata
> class TableOne:
>    # foo
>    pass
Overnight I have become a decorator fan.
I can postpone the study of metaclasses.
Thanks.
e
-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From georgeryoung at gmail.com  Thu Sep  8 17:19:29 2011
From: georgeryoung at gmail.com (gry)
Date: Thu, 8 Sep 2011 14:19:29 -0700 (PDT)
Subject: replace random matches of regexp
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <cf1590ab-2085-4739-816c-63ce1afd2ce2@h14g2000yqi.googlegroups.com>

On Sep 8, 3:51?pm, gry <georgeryo... at gmail.com> wrote:
To elaborate(always give example of desired output...) I would hope to
get something like:

SELECT public.max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
(PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON
(public.ceil(0.46)
=public.sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I)
=
public.sqrt((0.02 + PUBLIC_TT_1.F))) OR

notice the 'ceil' on the third line did not get changed.


From paul.hermeneutic at gmail.com  Thu Sep  8 18:29:39 2011
From: paul.hermeneutic at gmail.com (Paul Watson)
Date: Thu, 08 Sep 2011 16:29:39 -0600
Subject: Django or web2py
Message-ID: <9cstuhFnm0U1@mid.individual.net>

I have read some of the talk around these two frameworks.

Would you say that web2py is more geared toward the enterprise?

Which one do you believe will be on Python 3 more quickly?


From cs at zip.com.au  Thu Sep  8 18:39:44 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 9 Sep 2011 08:39:44 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <j4aj1302fg0@news3.newsguy.com>
References: <j4aj1302fg0@news3.newsguy.com>
Message-ID: <20110908223944.GA28756@cskk.homeip.net>

On 08Sep2011 14:21, Chris Torek <nospam at torek.net> wrote:
| In article <mailman.854.1315441399.27778.python-list at python.org>
| Cameron Simpson  <cs at zip.com.au> wrote:
| >Facilities like feof() in C and eof in Pascal already lead to lots of
| >code that runs happily with flat files and behaves badly in interactive
| >or piped input. It is _so_ easy to adopt a style like:
| >
| >  while not eof(filehandle):
| >    line = filehandle.nextline()
| >    ...
| 
| Minor but important point here: eof() in Pascal is predictive (uses
| a "crystal ball" to peer into the future to see whether EOF is is
| about to occur -- which really means, reads ahead, causing that
| interactivity problem you mentioned), but feof() in C is "post-dictive".
| The feof(stream) function returns a false value if the stream has
| not yet encountered an EOF, but your very next attempt to read from
| it may (or may not) immediately encounter that EOF.

Thanks. I had forgotten this nuance. Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

                          "Where am I?"
                        "In the Village."
                       "What do you want?"
                         "Information."
                    "Whose side are you on?"
"That would be telling. We want information. Information. Information!"
                       "You won't get it!"
                 "By hook or by crook, we will."
                         "Who are you?"
                       "The new number 2."
                       "Who is number 1?"
                       "You are number 6."
              "I am not a number, I am a free man!"
                           [Laughter]


From abhishek.vit at gmail.com  Thu Sep  8 18:49:51 2011
From: abhishek.vit at gmail.com (Abhishek Pratap)
Date: Thu, 8 Sep 2011 15:49:51 -0700
Subject: Processing a file using multithreads
Message-ID: <CAJbA1KCJ4484icWmThLYUewWk6BGf=HZemVtfeOdOva7=c3YyA@mail.gmail.com>

Hi Guys

My experience with python is 2 days and I am looking for a slick way
to use multi-threading to process a file. Here is what I would like to
do which is somewhat similar to MapReduce in concept.

# test case

1. My input file is 10 GB.
2. I want to open 10 file handles each handling 1 GB of the file
3. Each file handle is processed in by an individual thread using the
same function ( so total 10 cores are assumed to be available on the
machine)
4. There will be 10 different output files
5. once the 10 jobs are complete a reduce kind of function will
combine the output.

Could you give some ideas ?

So given a file I would like to read it in #N chunks through #N file
handles and process each of them separately.

Best,
-Abhi


From simoncropper at fossworkflowguides.com  Thu Sep  8 19:40:42 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 09:40:42 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E69527A.20608@fossworkflowguides.com>

On 09/09/11 01:11, Steven D'Aprano wrote:
> [SNIP]
> It's no harder to put the search terms into a google URL, which still gets
> the point across without being a dick about it:
 > [SNIP]

[RANT]

OK I was not going to say anything but...

1. Being told to google-it when I explicitly stated in my initial post 
that I had been doing this and had not been able to find anything is 
just plain rude. It is unconstructive and irritating.

2. I presume that python-list is a mail list for python users - 
beginners, intermediate and advanced. If it is not then tell me and I 
will go somewhere else.

3. Some searches, particularly for common terms throw millions of hits. 
'Python' returns 147,000,000 results on google, 'Sitemap' returns 
1,410,000,000 results. Even 'Python AND Sitemap' still returns 5,020 
results. Working through these links takes you round and round with no 
clear solutions. Asking for help on the primary python mail list -- 
after conducting a preliminary investigation for tools, libraries, code 
snippets seemed legitimate.

4. AND YES, I could write a program but why recreate code when there is 
a strong likelihood that code already exists. One of the advantages of 
python is that a lot of code is redistributed under licences that 
promote reuse. So why reinvent the wheel when their is a library full of 
code. Sometimes you just need help finding the door.

4. If someone is willing to help me, rather than lecture me (or poke me 
to see if they get a response), I would appreciate it.

[END RANT]

For people that are willing to help. My original request was...

I am after a way of pointing a python routine to my website and have it
create a tree, represented as a hierarchical HTML list in a webpage, of
all the pages in that website (recursive list of internal links to HTML
documents; ignore images, etc.).

In subsequent notes to Thomas 'PointedEars'...

I pointed to an example of the desired output here 
http://lxml.de/sitemap.html

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From cs at zip.com.au  Thu Sep  8 20:03:34 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 9 Sep 2011 10:03:34 +1000
Subject: killing a script
In-Reply-To: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110909000334.GA9300@cskk.homeip.net>

On 30Aug2011 14:13, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
| On Tue, 30 Aug 2011 08:53 am Arnaud Delobelle wrote:
| >> Yes, but if I am not mistaken, that will require me to put a line or
| >> two after each os.system call. That's almost like whack-a-mole at the
| >> code level rather than the Control-C level. OK, not a huge deal for
| >> one script, but I was hoping for something simpler. I was hoping I
| >> could put one line at the top of the script and be done with it.
| > 
| > Write a function!  That's what they're for after all :)
| 
| I'm not sure that this is actually as simple as that, especially using
| os.system.
| 
| As I understand it, the scenario is this:
| 
| The main script looks something like this:
| 
| for x in whatever:
|     os.system('something.py x')
| 
| Each time through the loop, a new Python process is started. Each process
| runs in the foreground, capturing standard input, and so hitting Ctrl-C
| kills *that* process, not the main script. Unless, by chance, the Ctrl-C
| happens after the system call returns, but before the next one starts, it
| is completely invisible to the parent process (the main script). Wrapping
| os.system in a function does nothing to fix that.

Presuming you're talking about UNIX, this is not correct.

Ctrl-C at the terminal delivers SIGINT to _every_ process in the controlling
process group for the terminal. It also has _nothing_ to do with the standard
input.

When you run a script, yea even a Python script, thus:

  myscript ...

then job control capable shells (all of them, these days) put the python
process running "myscript" in its own process group as the leader
(being, initially, the only process in the group). If myscript forks
other processes, as happens in os.system(), they are _also_ in that
process group. _ALL_ of them receive the SIGINT from your Ctrl-C.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

DRM: the functionality of refusing to function. - Richard Stallman


From greg.ewing at canterbury.ac.nz  Thu Sep  8 20:03:45 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 09 Sep 2011 12:03:45 +1200
Subject: Processing a file using multithreads
In-Reply-To: <mailman.885.1315522214.27778.python-list@python.org>
References: <mailman.885.1315522214.27778.python-list@python.org>
Message-ID: <9ct3f4FuvnU1@mid.individual.net>

Abhishek Pratap wrote:

> 3. Each file handle is processed in by an individual thread using the
> same function ( so total 10 cores are assumed to be available on the
> machine)

Are you expecting the processing to be CPU bound or
I/O bound?

If it's I/O bound, multiple cores won't help you, and
neither will threading, because it's the disk doing the
work, not the CPU.

If it's CPU bound, multiple threads in one Python process
won't help, because of the GIL. You'll have to fork
multiple OS processes in order to get Python code running
in parallel on different cores.

-- 
Greg


From rhodri at wildebst.demon.co.uk  Thu Sep  8 20:32:42 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 09 Sep 2011 01:32:42 +0100
Subject: Create an index from a webpage [RANT, DNFTT]
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
Message-ID: <op.v1imgsvpa8ncjz@gnudebst>

On Fri, 09 Sep 2011 00:40:42 +0100, Simon Cropper  
<simoncropper at fossworkflowguides.com> wrote:

> On 09/09/11 01:11, Steven D'Aprano wrote:
>> [SNIP]
>> It's no harder to put the search terms into a google URL, which still  
>> gets
>> the point across without being a dick about it:
>  > [SNIP]
>
> [RANT]
>
> OK I was not going to say anything but...

Ahem.  You should expect a certain amount of ribbing after admitting that  
your Google-fu is weak.  So is mine, but hey.

> 4. If someone is willing to help me, rather than lecture me (or poke me  
> to see if they get a response), I would appreciate it.

The Google Python Sitemap Generator  
(http://www.smart-it-consulting.com/article.htm?node=166&page=128, fourth  
offering when you google "map a website with Python") looks like a  
promising start.  At least it produces something in XML -- filtering that  
and turning it into HTML should be fairly straightforward.


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


From nobody at nowhere.com  Thu Sep  8 20:45:42 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 09 Sep 2011 01:45:42 +0100
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.09.00.45.41.959000@nowhere.com>

On Thu, 08 Sep 2011 10:29:26 +1000, Steven D'Aprano wrote:

> I suppose "one class per file" might be useful for those using an editor
> with no search functionality. Other than that, is there any justification
> for this rule? Any Java fans want to defend this?

Not a Java fan, but:

The Java compiler also acts as a "make" program. If it doesn't find
a .class file for a needed class, it will search for the corresponding
.java file and compile that. So to compile a complex program, you only
need to compile the top-level file (e.g. HelloWorld.java), and it will
compile everything which is required. No Makefile is needed, as the
relationship between classes, object files and source files is fixed.



From prachar at gmail.com  Thu Sep  8 21:09:31 2011
From: prachar at gmail.com (papu)
Date: Thu, 8 Sep 2011 18:09:31 -0700 (PDT)
Subject: Python: Deleting specific words from a file.
Message-ID: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>

Hello, I have a data file (un-structed messy file) from which I have
to scrub specific list of words (delete words).

Here is what I am doing but with no result:

infile = "messy_data_file.txt"
outfile = "cleaned_file.txt"

delete_list = ["word_1","word_2"....,"word_n"]
new_file = []
fin=open(infile,"")
fout = open(outfile,"w+")
for line in fin:
    for word in delete_list:
        line.replace(word, "")
    fout.write(line)
fin.close()
fout.close()

I have put the code above in a file. When I execute it, I dont see the
result file. I am not sure what the error is. Please let me know what
I am doing wrong.


From python at mrabarnett.plus.com  Thu Sep  8 21:31:23 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 09 Sep 2011 02:31:23 +0100
Subject: Python: Deleting specific words from a file.
In-Reply-To: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
Message-ID: <4E696C6B.7080609@mrabarnett.plus.com>

On 09/09/2011 02:09, papu wrote:
> Hello, I have a data file (un-structed messy file) from which I have
> to scrub specific list of words (delete words).
>
> Here is what I am doing but with no result:
>
> infile = "messy_data_file.txt"
> outfile = "cleaned_file.txt"
>
> delete_list = ["word_1","word_2"....,"word_n"]
> new_file = []
> fin=open(infile,"")
> fout = open(outfile,"w+")
> for line in fin:
>      for word in delete_list:
>          line.replace(word, "")
>      fout.write(line)
> fin.close()
> fout.close()
>
> I have put the code above in a file. When I execute it, I dont see the
> result file. I am not sure what the error is. Please let me know what
> I am doing wrong.

The .replace method _returns_ its result.

Strings are immutable, they can't be changed in-place.


From davea at ieee.org  Thu Sep  8 21:34:16 2011
From: davea at ieee.org (Dave Angel)
Date: Thu, 08 Sep 2011 21:34:16 -0400
Subject: Processing a file using multithreads
In-Reply-To: <CAJbA1KCJ4484icWmThLYUewWk6BGf=HZemVtfeOdOva7=c3YyA@mail.gmail.com>
References: <CAJbA1KCJ4484icWmThLYUewWk6BGf=HZemVtfeOdOva7=c3YyA@mail.gmail.com>
Message-ID: <4E696D18.807@ieee.org>

On 01/-10/-28163 02:59 PM, Abhishek Pratap wrote:
> Hi Guys
>
> My experience with python is 2 days and I am looking for a slick way
> to use multi-threading to process a file. Here is what I would like to
> do which is somewhat similar to MapReduce in concept.
>
> # test case
>
> 1. My input file is 10 GB.
> 2. I want to open 10 file handles each handling 1 GB of the file
> 3. Each file handle is processed in by an individual thread using the
> same function ( so total 10 cores are assumed to be available on the
> machine)
> 4. There will be 10 different output files
> 5. once the 10 jobs are complete a reduce kind of function will
> combine the output.
>
> Could you give some ideas ?
>
> So given a file I would like to read it in #N chunks through #N file
> handles and process each of them separately.
>
> Best,
> -Abhi
>
You should probably forget threads, and simply do them as 10 separate 
processes, all launched by a single parent.  Since they don't share any 
state, there's no need to get the inefficiency of threads.

DaveA


From rosuav at gmail.com  Thu Sep  8 21:37:44 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 11:37:44 +1000
Subject: How to structure packages
In-Reply-To: <pan.2011.09.09.00.45.41.959000@nowhere.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
Message-ID: <CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>

On Fri, Sep 9, 2011 at 10:45 AM, Nobody <nobody at nowhere.com> wrote:
> The Java compiler also acts as a "make" program. If it doesn't find
> a .class file for a needed class, it will search for the corresponding
> .java file and compile that. So to compile a complex program, you only
> need to compile the top-level file (e.g. HelloWorld.java), and it will
> compile everything which is required. No Makefile is needed, as the
> relationship between classes, object files and source files is fixed.
>

If that's the entire benefit, then I think this is a rather hefty
price to pay for the elimination of a makefile. Oh wow, I can type
"javac MyClass.java" and it picks up all the others! If you're
dividing a project into multiple files already, is it that hard to
have one more that defines the relationships between the others?

Chris Angelico


From simoncropper at fossworkflowguides.com  Thu Sep  8 22:09:58 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 12:09:58 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <op.v1imgsvpa8ncjz@gnudebst>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>
	<op.v1imgsvpa8ncjz@gnudebst>
Message-ID: <4E697576.5030301@fossworkflowguides.com>

On 09/09/11 10:32, Rhodri James wrote:
> On Fri, 09 Sep 2011 00:40:42 +0100, Simon Cropper
>
> Ahem. You should expect a certain amount of ribbing after admitting that
> your Google-fu is weak. So is mine, but hey.

I did not admit anything. I consider my ability to find this quite good 
actually. Others assumed that my "Google-fu is weak".

>
>> 4. If someone is willing to help me, rather than lecture me (or poke
>> me to see if they get a response), I would appreciate it.
>
> The Google Python Sitemap Generator
> (http://www.smart-it-consulting.com/article.htm?node=166&page=128,
> fourth offering when you google "map a website with Python") looks like
> a promising start. At least it produces something in XML -- filtering
> that and turning it into HTML should be fairly straightforward.
>

I saw this in my original search. My conclusions were..

1. The last update was in 2005. That is 6 years ago. In that time we 
have had numerous upgrades to HTML, Logs, etc.
2. The script expects to run on the webserver. I don't have the ability 
to run python on my webserver.
3. There are also a number of dead-links and redirects to Google 
Webmaster Central / Tools, which then request you submit a sitemap (as I 
alluded we get into a circular confusing cross-referencing situation)
4. The ultimate product - if you can get the package to work - would be 
a XML file you would need to massage to extract what you needed.

To me this seems like overkill.

I assume you could import the parent html file, scrap all the links on 
the same domain, dump these to a hierarchical list and represent this in 
HTML using BeautifulSoup or something similar. Certainly doable but 
considering the shear commonality of this task I don't understand why a 
simple script does not already exist - hence my original request for 
assistance.

It would appear from the feedback so far this 'forum' is not the most 
appropriate to ask this question. Consequently, I will take your advice 
and keep looking... and if I don't find something within a reasonable 
time frame, just write something myself.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From steve+comp.lang.python at pearwood.info  Thu Sep  8 22:14:55 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 12:14:55 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
Message-ID: <4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>

Simon Cropper wrote:

> 1. Being told to google-it when I explicitly stated in my initial post
> that I had been doing this and had not been able to find anything is
> just plain rude. It is unconstructive and irritating.

Why so you did. Even though I wasn't the one who told you to google it, I'll
apologise too because I was thinking the same thing. Sorry about that.


> 3. Some searches, particularly for common terms throw millions of hits.
> 'Python' returns 147,000,000 results on google, 'Sitemap' returns
> 1,410,000,000 results. Even 'Python AND Sitemap' still returns 5,020
> results. 

How about "python generate a site map"? The very first link on DuckDuckGo is
this:

http://www.conversationmarketing.com/2010/08/python-sitemap-crawler-1.htm

Despite the domain, there is actual Python code on the page. Unfortunately
it looks like crappy code with broken formatting and a mix of <\br> tags,
but it's a start.

Searching for "site map" on PyPI returns a page full of hits:

http://pypi.python.org/pypi?%3Aaction=search&term=site+map&submit=search

Most of them seem to rely on a framework like Django etc, but you might find
something useful.


> 4. AND YES, I could write a program but why recreate code when there is
> a strong likelihood that code already exists.

"Strong" likelihood? Given how hard it is to find an appropriate sitemap
generator written in Python, I'd say there is a strong likelihood that one
that meets your needs and is publicly available under an appropriate
licence is vanishingly small.

If you do decide to write your own, please consider uploading it to PyPI
under a FOSS licence.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep  8 22:16:12 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 12:16:12 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>
	<op.v1imgsvpa8ncjz@gnudebst>
	<mailman.891.1315534207.27778.python-list@python.org>
Message-ID: <4e6976ec$0$29987$c3e8da3$5496439d@news.astraweb.com>

Simon Cropper wrote:

> Certainly doable but
> considering the shear commonality of this task I don't understand why a
> simple script does not already exist

Perhaps it isn't as common or as simple as you believe.



-- 
Steven



From simoncropper at fossworkflowguides.com  Thu Sep  8 22:43:58 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 12:43:58 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>
	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E697D6E.4010101@fossworkflowguides.com>

On 09/09/11 12:14, Steven D'Aprano wrote:
> If you do decide to write your own, please consider uploading it to PyPI
> under a FOSS licence.

At present I am definitely getting the impression that my assumption 
that something like this' must out there', is wrong.

I am following people's links and suggestions (as well as my own; I have 
spent 1-2 hours looking) but have not found anything that is able to be 
used with only minor adjustments.

I have found a XML-Sitemaps Generator at http://www.xml-sitemaps.com,
this page allows you to create the XML files that can be uploaded to 
google. But as stated I don't actually want what people now call 
'sitemaps' I want a automatically updated 'index / contents page' to my 
website. For example, if I add a tutorial or update any of my links I 
want the 'global contents page' to be updated when the python script is run.

I am now considering how I might address this requirement. If I create a 
python script I will post it on PyPI. As with all my work it will be 
released under the GPLv3 licence.

Thanks for your help.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From chinakr at gmail.com  Thu Sep  8 22:47:04 2011
From: chinakr at gmail.com (chinakr)
Date: Thu, 8 Sep 2011 19:47:04 -0700 (PDT)
Subject: Using web2py and deck.js to make HTML5 presentation
Message-ID: <b2332141-dc07-47ec-8eb0-6f2431f499fb@x14g2000prn.googlegroups.com>

web2py is one of the most popular Web Frameworks. web2py has MVC
architecture, offering us excellent development efficiency and
extensibility. web2py is very suitable for Web application
development.

deck.js is a JavaScript library for making HTML5 presentation. It
supports keyboard navigation, themes switching and extensions. With
deck.js, making HTML5 presentation becomes easy, beautiful and
convinient.

SEO Brief Guide is a HTML5 presentation developing with web2py and
deck.js, wich is free and open source.

Demo?
http://openclass.vstudy.cn/seo/training

Source code?
http://vstudy.htexam.net/soft/download/web2py.app.openclass.w2p


From rosuav at gmail.com  Thu Sep  8 22:59:09 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 12:59:09 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4E697D6E.4010101@fossworkflowguides.com>
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<4E697D6E.4010101@fossworkflowguides.com>
Message-ID: <CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>

On Fri, Sep 9, 2011 at 12:43 PM, Simon Cropper
<simoncropper at fossworkflowguides.com> wrote:
> At present I am definitely getting the impression that my assumption that
> something like this' must out there', is wrong.
>
> I have found a XML-Sitemaps Generator at http://www.xml-sitemaps.com,
> this page allows you to create the XML files that can be uploaded to google.
> But as stated I don't actually want what people now call 'sitemaps' I want a
> automatically updated 'index / contents page' to my website. For example, if
> I add a tutorial or update any of my links I want the 'global contents page'
> to be updated when the python script is run.

What you're looking at may be closer to autogenerated documentation
than to a classic site map. There are a variety of tools that generate
HTML pages on the basis of *certain information found in* all the
files in a directory (as opposed to the entire content of those
files). What you're trying to do may be sufficiently specific that it
doesn't already exist, but it might be worth having a quick look at
autodoc/doxygen - at least for some ideas.

Chris Angelico


From gordon at panix.com  Thu Sep  8 23:16:13 2011
From: gordon at panix.com (John Gordon)
Date: Fri, 9 Sep 2011 03:16:13 +0000 (UTC)
Subject: Python: Deleting specific words from a file.
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
Message-ID: <j4c0ds$sv0$1@reader1.panix.com>

In <30f9b718-bb3c-4c92-8a03-0f760c993939 at a12g2000yqi.googlegroups.com> papu <prachar at gmail.com> writes:

> Hello, I have a data file (un-structed messy file) from which I have
> to scrub specific list of words (delete words).

> Here is what I am doing but with no result:

> infile = "messy_data_file.txt"
> outfile = "cleaned_file.txt"

> delete_list = ["word_1","word_2"....,"word_n"]
> new_file = []

What does new_file do?  I don't see it used anywhere.

> fin=open(infile,"")

There should be an "r" inside those quotes.  In fact this is an error
and it will stop your program from running.

> fout = open(outfile,"w+")

What is the "+" supposed to do?

> for line in fin:
>     for word in delete_list:
>         line.replace(word, "")

replace() returns the modified string; it does not alter the existing
string.

Do this instead:

  line = line.replace(word, "")

>     fout.write(line)
> fin.close()
> fout.close()

> I have put the code above in a file. When I execute it, I dont see the
> result file. I am not sure what the error is. Please let me know what
> I am doing wrong.

When you say you don't see the result file, do you mean it doesn't get
created at all?

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From jack.bates at gmail.com  Thu Sep  8 23:18:54 2011
From: jack.bates at gmail.com (Jack Bates)
Date: Thu, 8 Sep 2011 20:18:54 -0700
Subject: buffer() as argument to ctypes function which expects c_void_p?
Message-ID: <CAAuurfLUHpWvXk_yt9NxNzhZr-TUxjsqNSD2OmQs5DMSiXwY8w@mail.gmail.com>

How do you pass a Python buffer() value as an argument to a ctypes
function, which expects a c_void_p argument? I keep getting TypeError:

ctypes.ArgumentError: argument 2: <type 'exceptions.TypeError'>: wrong type


From simoncropper at fossworkflowguides.com  Thu Sep  8 23:20:01 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 13:20:01 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>	<4E697D6E.4010101@fossworkflowguides.com>
	<CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>
Message-ID: <4E6985E1.9050009@fossworkflowguides.com>

On 09/09/11 12:59, Chris Angelico wrote:
> On Fri, Sep 9, 2011 at 12:43 PM, Simon Cropper
> <simoncropper at fossworkflowguides.com>  wrote:
>> At present I am definitely getting the impression that my assumption that
>> something like this' must out there', is wrong.
>>
>> I have found a XML-Sitemaps Generator at http://www.xml-sitemaps.com,
>> this page allows you to create the XML files that can be uploaded to google.
>> But as stated I don't actually want what people now call 'sitemaps' I want a
>> automatically updated 'index / contents page' to my website. For example, if
>> I add a tutorial or update any of my links I want the 'global contents page'
>> to be updated when the python script is run.
>
> What you're looking at may be closer to autogenerated documentation
> than to a classic site map. There are a variety of tools that generate
> HTML pages on the basis of *certain information found in* all the
> files in a directory (as opposed to the entire content of those
> files). What you're trying to do may be sufficiently specific that it
> doesn't already exist, but it might be worth having a quick look at
> autodoc/doxygen - at least for some ideas.
>
> Chris Angelico

Chris,

You assessment is correct. Working through the PyPI I am having better 
luck with using different terms than the old-term 'sitemap'.

I have found a link to funnelweb which uses the transmogrify library 
(yeah, as if I would have typed this term into google!) that is 
described as "Crawl and parse static sites and import to Plone".

http://pypi.python.org/pypi/funnelweb/1.0

As funnelweb is modular, using a variety of the transmogrify tools, 
maybe I could modify this to create a 'non-plone' version.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From rosuav at gmail.com  Thu Sep  8 23:46:25 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 13:46:25 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4E6985E1.9050009@fossworkflowguides.com>
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<4E697D6E.4010101@fossworkflowguides.com>
	<CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>
	<4E6985E1.9050009@fossworkflowguides.com>
Message-ID: <CAPTjJmoQrgUDv1O7nMxeixx+0mrPX9zrYhtaLSe_jVUG_9LjJg@mail.gmail.com>

On Fri, Sep 9, 2011 at 1:20 PM, Simon Cropper
<simoncropper at fossworkflowguides.com> wrote:
> Chris,
>
> You assessment is correct. Working through the PyPI I am having better luck
> with using different terms than the old-term 'sitemap'.
>
> I have found a link to funnelweb which uses the transmogrify library (yeah,
> as if I would have typed this term into google!) that is described as "Crawl
> and parse static sites and import to Plone".
>

And once again, python-list has turned a rant into a useful,
informative, and productive thread :)

ChrisA


From aspineux at gmail.com  Fri Sep  9 00:44:34 2011
From: aspineux at gmail.com (aspineux)
Date: Thu, 8 Sep 2011 21:44:34 -0700 (PDT)
Subject: Processing a file using multithreads
References: <mailman.885.1315522214.27778.python-list@python.org>
Message-ID: <c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>

On Sep 9, 12:49?am, Abhishek Pratap <abhishek.... at gmail.com> wrote:
> Hi Guys
>
> My experience with python is 2 days and I am looking for a slick way
> to use multi-threading to process a file. Here is what I would like to
> do which is somewhat similar to MapReduce in concept.
>
> # test case
>
> 1. My input file is 10 GB.
> 2. I want to open 10 file handles each handling 1 GB of the file
> 3. Each file handle is processed in by an individual thread using the
> same function ( so total 10 cores are assumed to be available on the
> machine)
> 4. There will be 10 different output files
> 5. once the 10 jobs are complete a reduce kind of function will
> combine the output.
>
> Could you give some ideas ?

You can use "multiprocessing" module instead of thread to bypass the
GIL limitation.

First cut your file in 10 "equal" parts. If it is line based search
for the first line
close to the cut. Be sure to have "start" and "end" for each parts,
start is the address of the
first character of the first line and end is one line too much (==
start of the next block)

Then use this function to handle each part .

def handle(filename, start, end)
  f=open(filename)
  f.seek(start)
  for l in f:
    start+=len(l)
    if start>=end:
      break
    # handle line l here
    print l

Do it first in a single process/thread to be sure this is ok (easier
to debug) then split in multi processes


>
> So given a file I would like to read it in #N chunks through #N file
> handles and process each of them separately.
>
> Best,
> -Abhi



From vineet.deodhar at gmail.com  Fri Sep  9 00:52:26 2011
From: vineet.deodhar at gmail.com (Vineet)
Date: Thu, 8 Sep 2011 21:52:26 -0700 (PDT)
Subject: Django or web2py
References: <9cstuhFnm0U1@mid.individual.net>
Message-ID: <72da7d9b-ca04-4597-8670-22a954481e40@b9g2000prd.googlegroups.com>

On Sep 9, 3:29?am, Paul Watson <paul.hermeneu... at gmail.com> wrote:
> I have read some of the talk around these two frameworks.
>
> Would you say that web2py is more geared toward the enterprise?
>
> Which one do you believe will be on Python 3 more quickly?

Both Django & web2py are good frameworks.
I have tried both of them + others & then chosen a hybrid of web2py +
DABO bizobj for my work.
(DABO is a desktop app framework; so I have chosen only the BizObj
layer from it, which can do its job in any other python web or desktop
framework).

Typically, my apps are data-centric business apps.
web2py wins in simplycity yet powerfullness, no install, no
dependencies, good docs & community, low learning curve, etc.

DABO BizObj excels in managing the business logic aspect (including
managing multiple tables insert/update/delete, rollback, before
insert, after save, ... the list is quite long)

http://web2py.com
www.web2pyclices.com
http://thewinecellarbook.com/daboDocTestAlt/dabo.lib.datanav.Bizobj.Bizobj.html
http://dabodev.com/

Also, there are threads in stackoverflow.com which discuss in-depth
the +1 & -1 for these frameworks.
Contributors to these threads include the lead developers including
Massimo himself.

Hope this helps.

---Vineet


From jialiuonlineshoe04 at 163.com  Fri Sep  9 01:29:03 2011
From: jialiuonlineshoe04 at 163.com (amy)
Date: Thu, 8 Sep 2011 22:29:03 -0700 (PDT)
Subject: wholesale all brand(UGGBOOTS, SHOES, CLOTHES, HANDBAG, WATCH, JEANS,
	JERSEY, T-SHIRT, SHIRTS, HOODY, EYEGLASS, CAP, SHAWL, WALLT)
	and so on.
Message-ID: <111713be-0e9f-404f-ac46-1b7747c90f94@f31g2000prj.googlegroups.com>

wholesale all brand shoes(NIKE,ADIDAS,LV,GUCCI,CHANEL,PRADA,POLO,UGG
BOOTS,D&G,DIOR )and so on.
paypal payment wholesale all brand clothing(T-
SHIRT,JEANS,JERSEY,HOODIES,JACKETS,HARDY,SWEATER,SHIRTS )and so on .
http://www.24hour-buy.com/
paypal payment all brand
watch(ROLEX,OMEGA,CHANEL,LV,CARTIER,IWC,GUCCI,RADO )and so on.
paypal payment all brand
handbag(LV,GUCCI,CHANEL,PRADA,POLO,COACH,FENDI,CHLOE,BUBERRY,JUICY)
and so on.
paypal payment brand CAP,SHAWL,BELT,WALLET,UNDER WEAR)and so on.

More detail land,address:  http://www.24hour-buy.com/


From wildeskraut at googlemail.com  Fri Sep  9 01:47:34 2011
From: wildeskraut at googlemail.com (Oliver)
Date: Thu, 8 Sep 2011 22:47:34 -0700 (PDT)
Subject: TypeError: object.__init__() takes no parameters
Message-ID: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>

Hello together,

let me be honest with you, I am a poor programmer who can only do
Perl.
I tried to code a program in Perl, but found that another guy already
finished this job in Python.
Unlucky for me, this guy is now CEO of a company, not really
interested in supporting his old code.

If I want to run shapes.py I receive this error message:

=== error message ===

C:\Documents and Settings\mhg\Desktop\palcalc>shapes.py
EE...
======================================================================
ERROR: test_fits (__main__.containerTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
265, in test_fits
    cont = Container()
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
90, in __init__
    super(Container, self).__init__(xsize, ysize)
TypeError: object.__init__() takes no parameters

======================================================================
ERROR: test_place_bin (__main__.containerTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
257, in test_place_bin
    cont = Container()
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
90, in __init__
    super(Container, self).__init__(xsize, ysize)
TypeError: object.__init__() takes no parameters

----------------------------------------------------------------------
Ran 5 tests in 0.032s

FAILED (errors=2)

=== end of error message ===

Snippets of source code:

Line 264 - 268

def test_fits(self):
        cont = Container()
        cont.place_bin(0, 0, 210, 280)
        self.assertEqual(False, cont.fits(Rectangle(0, 210, 280,
420)))
        self.assertEqual(True, cont.fits(Rectangle(0, 280, 280, 490)))

Line 87 - 93

class Container(object):
    """Container to store  a number of non-overlapping rectangles."""
    def __init__(self, xsize=1200, ysize=800):
        super(Container, self).__init__(xsize, ysize)
        self.rect = Rectangle(0, 0, xsize, ysize)
        self.boxes = []
        self.last_placement_strategy = 0

Line 254 - 262

class containerTests(unittest.TestCase):
    """Tests for container objects."""
    def test_place_bin(self):
        cont = Container()
        cont.place_bin(0, 0, 40, 40)
        self.failUnlessRaises(RuntimeError, cont.place_bin, 0, 0, 40,
40)
        cont = Container()
        cont.place_bin(0, 0, 210, 280)
        self.failUnlessRaises(RuntimeError, cont.place_bin, 0, 210,
280, 420)

I think this is the main function:

if __name__ == '__main__':
    unittest.main()

I do not know if I posted what you need to help me, it just would ease
my life a lot. If you need more information please let me know - if
you want you can even be unfriendly to me :)


From tjreedy at udel.edu  Fri Sep  9 02:04:15 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 09 Sep 2011 02:04:15 -0400
Subject: Python: Deleting specific words from a file.
In-Reply-To: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
Message-ID: <j4caan$bra$1@dough.gmane.org>

On 9/8/2011 9:09 PM, papu wrote:
> Hello, I have a data file (un-structed messy file) from which I have
> to scrub specific list of words (delete words).
>
> Here is what I am doing but with no result:
>
> infile = "messy_data_file.txt"
> outfile = "cleaned_file.txt"
>
> delete_list = ["word_1","word_2"....,"word_n"]
> new_file = []
> fin=open(infile,"")
> fout = open(outfile,"w+")
> for line in fin:
>      for word in delete_list:
>          line.replace(word, "")
>      fout.write(line)
> fin.close()
> fout.close()

If you have very many words (and you will need all possible forms of 
each word if you do exact matches), The following (untested and 
incomplete) should run faster.

delete_set = {"word_1","word_2"....,"word_n"}
...
for line in fin:
     for word in line.split()
         if word not in delete_set:
             fout.write(word) # also write space and nl.


Depending on what your file is like, you might be better with 
re.split('(\W+)', line). An example from the manual:
 >>> re.split('(\W+)', '...words, words...')
['', '...', 'words', ', ', 'words', '...', '']

so all non-word separator sequences are preserved and written back out 
(as they will not match delete set).

-- 
Terry Jan Reedy



From mimohammedimran41 at gmail.com  Fri Sep  9 02:20:06 2011
From: mimohammedimran41 at gmail.com (mohammed imran)
Date: Thu, 8 Sep 2011 23:20:06 -0700 (PDT)
Subject: reshma
Message-ID: <fe310c0a-f17f-40f5-8628-446593906db3@e20g2000prn.googlegroups.com>

http://123maza.com/65/fun564/


From ben+python at benfinney.id.au  Fri Sep  9 02:44:37 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 09 Sep 2011 16:44:37 +1000
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
Message-ID: <87sjo6mcyy.fsf@benfinney.id.au>

Oliver <wildeskraut at googlemail.com> writes:

> let me be honest with you, I am a poor programmer who can only do
> Perl.

I strongly suspect you could do more than that.

Welcome to the Python discussion forum.

> I tried to code a program in Perl, but found that another guy already
> finished this job in Python. Unlucky for me, this guy is now CEO of a
> company, not really interested in supporting his old code.

Then he can hardly complain if someone else re-writes it in their
language of choice, can he? :-)

> C:\Documents and Settings\mhg\Desktop\palcalc>shapes.py
> EE...

This, and the rest of your output, is from the call to ?unittest.main?,
Python's standard-library module for unit testing.

>   File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
> 90, in __init__
>     super(Container, self).__init__(xsize, ysize)
> TypeError: object.__init__() takes no parameters

The ?super(Container, self)? call asks for a ?super? object representing
the (next) superclass of the type of ?self?.

In this case, as the error message indicates, the next superclass type
is ?object? ? the base type of all objects. Also as the error message
indicates, the initialiser for ?object? doesn't accept the parameters
being passed.

> class Container(object):
>     """Container to store  a number of non-overlapping rectangles."""
>     def __init__(self, xsize=1200, ysize=800):
>         super(Container, self).__init__(xsize, ysize)
>         self.rect = Rectangle(0, 0, xsize, ysize)
>         self.boxes = []
>         self.last_placement_strategy = 0

So, there's no sense in calling the superclass's ?__init__? method with
parameters which won't be accepted because of the function signature.


The next thing to do is to ask about the design of these classes (what
is the intention of this initialiser?). But you say you're entirely new
to it, and that the designer has no interest in it. What are your
options for getting their interest and participating in this thread?

-- 
 \     ?I cannot conceive that anybody will require multiplications at |
  `\   the rate of 40,000 or even 4,000 per hour ?? ?F. H. Wales, 1936 |
_o__)                                                                  |
Ben Finney


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Fri Sep  9 02:57:31 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Fri, 09 Sep 2011 08:57:31 +0200
Subject: TypeError: object.__init__() takes no parameters
In-Reply-To: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
Message-ID: <j4cdda$f61$1@r03.glglgl.eu>

Am 09.09.2011 07:47 schrieb Oliver:
> class Container(object):
>      """Container to store  a number of non-overlapping rectangles."""
>      def __init__(self, xsize=1200, ysize=800):
>          super(Container, self).__init__(xsize, ysize)

And this is the nonsense: Container derives from object and tries to 
call its superclass's constructor with 2 parameters - which won't work.

Write this as super(Container, self).__init__().

HTH,

Thomas


From nmarais at ska.ac.za  Fri Sep  9 03:00:21 2011
From: nmarais at ska.ac.za (Neilen Marais)
Date: Fri, 9 Sep 2011 00:00:21 -0700 (PDT)
Subject: Unittesting SocketServer.StreamRequestHandler subclasses
Message-ID: <a1b69a64-439f-4d7c-8df1-d60a7ab481d9@u26g2000yqu.googlegroups.com>

Hi,

Is there a recommended way for writing unittests of
SocketServer.StreamRequestHandler subclasses? I've tried making a
server stub class and a connection stub class with a recv() method
that immediately raises socket.error(errno.ECONNRESET, ).

This works OK, but it means that whatever unittests I run always
happens after the handler's handle() method has already been called.
Is there a way to avoid this?

Thanks
Neilen


From vineet.deodhar at gmail.com  Fri Sep  9 03:47:37 2011
From: vineet.deodhar at gmail.com (Vineet)
Date: Fri, 9 Sep 2011 00:47:37 -0700 (PDT)
Subject: Django or web2py
References: <9cstuhFnm0U1@mid.individual.net>
Message-ID: <203ea707-5a86-436e-816b-9f91d5971d82@y8g2000prd.googlegroups.com>

On Sep 9, 3:29?am, Paul Watson <paul.hermeneu... at gmail.com> wrote:
> I have read some of the talk around these two frameworks.
>
> Would you say that web2py is more geared toward the enterprise?
>
> Which one do you believe will be on Python 3 more quickly?

Both Django & web2py are good frameworks.
I have tried both of them + others & then chosen a hybrid of web2py +
DABO bizobj for my work.
(DABO is a desktop app framework; so I have chosen only the BizObj
layer from it, which can do its job in any other python web or desktop
framework).

Typically, my apps are data-centric business apps.
web2py wins in simplicity, flexibility, no install, no dependencies,
good docs & community, low learning curve, etc.

DABO BizObj excels in managing the business logic aspect.
With DABO bizobj layer, apart from the business logic, managing
multiple tables insert/update/delete, rollback, before-insert, after-
save, etc. is very handy... the list is quite long)
(I know you will say that every framework has got its own DAL. It's
true. But most of them are designed for basic database functions.)

Some useful links---
http://web2py.com
www.web2pyclices.com
http://thewinecellarbook.com/daboDocTestAlt/dabo.lib.datanav.Bizobj.B...
http://dabodev.com/

Also, there are threads in stackoverflow.com which discuss in-depth
the +1 & -1 for these frameworks.
Contributors to these threads include the lead developers including
Massimo himself.

Hope this helps.

---Vineet


From steve+comp.lang.python at pearwood.info  Fri Sep  9 04:33:48 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 18:33:48 +1000
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
Message-ID: <4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>

Thomas Rachel wrote:

> Am 09.09.2011 07:47 schrieb Oliver:
>> class Container(object):
>> """Container to store ?a number of non-overlapping rectangles."""
>> def __init__(self, xsize=1200, ysize=800):
>> super(Container, self).__init__(xsize, ysize)
> 
> And this is the nonsense: Container derives from object and tries to
> call its superclass's constructor with 2 parameters - which won't work.

Not nonsense. Merely a backward-incompatible change:


[steve at sylar ~]$ python2.2
Python 2.2.3 (#1, Aug 12 2010, 01:08:27)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> object("two", "parameters")
<object object at 0x92a43e8>


In Python 2.2, the default object constructor accepts, and ignores, any
parameters. In Python 2.3 on up, that becomes an error.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Fri Sep  9 05:07:24 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 19:07:24 +1000
Subject: killing a script
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
	<mailman.887.1315526624.27778.python-list@python.org>
Message-ID: <4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>

Cameron Simpson wrote:

> On 30Aug2011 14:13, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
> | On Tue, 30 Aug 2011 08:53 am Arnaud Delobelle wrote:
> | >> Yes, but if I am not mistaken, that will require me to put a line or
> | >> two after each os.system call. That's almost like whack-a-mole at the
> | >> code level rather than the Control-C level. OK, not a huge deal for
> | >> one script, but I was hoping for something simpler. I was hoping I
> | >> could put one line at the top of the script and be done with it.
> | > 
> | > Write a function!  That's what they're for after all :)
> | 
> | I'm not sure that this is actually as simple as that, especially using
> | os.system.
> | 
> | As I understand it, the scenario is this:
> | 
> | The main script looks something like this:
> | 
> | for x in whatever:
> |     os.system('something.py x')
> | 
> | Each time through the loop, a new Python process is started. Each
> | process runs in the foreground, capturing standard input, and so hitting
> | Ctrl-C kills *that* process, not the main script. Unless, by chance, the
> | Ctrl-C happens after the system call returns, but before the next one
> | starts, it is completely invisible to the parent process (the main
> | script). Wrapping os.system in a function does nothing to fix that.
> 
> Presuming you're talking about UNIX, this is not correct.
> 
> Ctrl-C at the terminal delivers SIGINT to _every_ process in the
> controlling process group for the terminal. It also has _nothing_ to do
> with the standard input.

There may be something to what you say, but the behaviour experienced by the
Original Poster still needs explaining. See below.

> When you run a script, yea even a Python script, thus:
> 
>   myscript ...
> 
> then job control capable shells (all of them, these days) put the python
> process running "myscript" in its own process group as the leader
> (being, initially, the only process in the group). If myscript forks
> other processes, as happens in os.system(), they are _also_ in that
> process group. _ALL_ of them receive the SIGINT from your Ctrl-C.


I can replicate to OP's problem with these two simple Python scripts:

[steve at sylar ~]$ cat script.py
#!/usr/bin/python
print "inside script.py"
print "type Ctrl-C to exit"
while True:
    pass

[steve at sylar ~]$ cat test.py
import os
print "calling script.py with os.system"
for i in range(3):
    os.system('./script.py')


And now run them:

[steve at sylar ~]$ python test.py
calling script.py with os.system
inside script.py
type Ctrl-C to exit
Traceback (most recent call last):
  File "./script.py", line 4, in <module>
    while True:
KeyboardInterrupt
inside script.py
type Ctrl-C to exit
Traceback (most recent call last):
  File "./script.py", line 5, in <module>
    pass
KeyboardInterrupt
inside script.py
type Ctrl-C to exit
Traceback (most recent call last):
  File "./script.py", line 4, in <module>
    while True:
KeyboardInterrupt


Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
script.py. While script.py is running, it receives the Ctrl-C, the calling
process does not.



-- 
Steven



From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Fri Sep  9 05:11:06 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Fri, 09 Sep 2011 11:11:06 +0200
Subject: TypeError: object.__init__() takes no parameters
In-Reply-To: <4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
	<4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4cl7r$k72$1@r03.glglgl.eu>

Am 09.09.2011 10:33 schrieb Steven D'Aprano:

> Not nonsense. Merely a backward-incompatible change:

[1]


> In Python 2.2, the default object constructor accepts, and ignores, any
> parameters. In Python 2.3 on up, that becomes an error.

Thanks, I wasn't aware of that. My first contact with Python was with 2.3...

Thomas

[1] Another example why backward-incompatible change are bad. Why was it 
necessary in this case? :-(


From vineet.deodhar at gmail.com  Fri Sep  9 05:39:31 2011
From: vineet.deodhar at gmail.com (Vineet)
Date: Fri, 9 Sep 2011 02:39:31 -0700 (PDT)
Subject: Django or web2py
References: <9cstuhFnm0U1@mid.individual.net>
	<203ea707-5a86-436e-816b-9f91d5971d82@y8g2000prd.googlegroups.com>
Message-ID: <be8e001d-46c8-4454-b11c-c3fe932dd8e2@v16g2000prb.googlegroups.com>

On Sep 9, 12:47?pm, Vineet <vineet.deod... at gmail.com> wrote:
> On Sep 9, 3:29?am, Paul Watson <paul.hermeneu... at gmail.com> wrote:
>
> > I have read some of the talk around these two frameworks.
>
> > Would you say that web2py is more geared toward the enterprise?
>
> > Which one do you believe will be on Python 3 more quickly?
>
> Both Django & web2py are good frameworks.
> I have tried both of them + others & then chosen a hybrid of web2py +
> DABO bizobj for my work.
> (DABO is a desktop app framework; so I have chosen only the BizObj
> layer from it, which can do its job in any other python web or desktop
> framework).
>
> Typically, my apps are data-centric business apps.
> web2py wins in simplicity, flexibility, no install, no dependencies,
> good docs & community, low learning curve, etc.
>
> DABO BizObj excels in managing the business logic aspect.
> With DABO bizobj layer, apart from the business logic, managing
> multiple tables insert/update/delete, rollback, before-insert, after-
> save, etc. is very handy... the list is quite long)
> (I know you will say that every framework has got its own DAL. It's
> true. But most of them are designed for basic database functions.)
>
> Some useful links---http://web2py.comwww.web2pyclices.comhttp://thewinecellarbook.com/daboDocTestAlt/dabo.lib.datanav.Bizobj.B...http://dabodev.com/
>
> Also, there are threads in stackoverflow.com which discuss in-depth
> the +1 & -1 for these frameworks.
> Contributors to these threads include the lead developers including
> Massimo himself.
>
> Hope this helps.
>
> ---Vineet

Re. your point about porting from py2 to py3, the following thread
makes it clear.
http://groups.google.com/group/web2py/browse_thread/thread/5fcd0e97452e9ab8/d38f99b959778cfb?lnk=gst&q=python+3#d38f99b959778cfb

---Vineet


From gandalf at shopzeus.com  Fri Sep  9 05:39:52 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 09 Sep 2011 11:39:52 +0200
Subject: Portable locale usage
In-Reply-To: <1468943535.28842.1315496382655.JavaMail.root@mail.zemris.fer.hr>
References: <1468943535.28842.1315496382655.JavaMail.root@mail.zemris.fer.hr>
Message-ID: <4E69DEE8.9050803@shopzeus.com>


>>>> Why are you trying to force a specific locale to your program
>>>> anyway?
>>> Because I wish to be able to correctly sort Croatian names.
>> Well, all right. If you want to sort Croatian names from a program that
>> runs on an English (or whatever) system, then you will have to check the
>> platform and use a locale that is supported by the platform. (But again,
>> this is not Python's limitation. Python doesn't know what encodings are
>> supported, in advance, and you cannot use a locale that is not supported...)
> I fully agree.
>
> I commented that, if a proper locale is installed,
> the following should work on any system:
>
> locale.setlocale(locale.LC_ALL, ('hr', locale.getpreferredencoding()))
>
> Currently the above does not work on Windows,
> and that is because the locale_alias for 'hr'
> is bound to 'hr_HR.ISO8859-2'.
> Check the source: .../Python-3.2.2/Lib/locale.py, line 537
>
> I was arguing that, on a Windows system,
> the locale_alias for 'hr' should be bound
> to 'Croatian_Croatia.1250'.

Looks like you have found a bug! :-) Why don't you post a bug report?

   L



From duncan.booth at invalid.invalid  Fri Sep  9 05:49:33 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 9 Sep 2011 09:49:33 GMT
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
Message-ID: <Xns9F5B6D522BDAFduncanbooth@127.0.0.1>

Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915
@spamschutz.glglgl.de> wrote:

> Am 09.09.2011 07:47 schrieb Oliver:
>> class Container(object):
>>      """Container to store  a number of non-overlapping rectangles."""
>>      def __init__(self, xsize=1200, ysize=800):
>>          super(Container, self).__init__(xsize, ysize)
> 
> And this is the nonsense: Container derives from object and tries to 
> call its superclass's constructor with 2 parameters - which won't work.
> 
> Write this as super(Container, self).__init__().
> 
It isn't nonsense, just poor and outdated practice. You might subclass 
Container with something that puts another base class into the mro between 
Container and object and in that case calling super(Container, self).
__init__() would be wrong.

object.__init__() used to accept and silently ignore any parameters. This 
meant you could safely pass any constructor parameters along in case there 
was an intervening base class that wanted them. However that was changed 
(presumably after this code was written) and now you have to be a bit more 
careful with your initialisation parameters.

This would be better in general, though if there is actually any code 
depending on xsize,ysize being passed up to a base class it will still need 
changing at the call site:

    def __init__(self, xsize=1200, ysize=800, *args, **kw):
          super(Container, self).__init__(*args, **kw)

That way any xsize and ysize arguments are removed but any additional 
arguments for other base classes are passed through.

-- 
Duncan Booth http://kupuguy.blogspot.com


From hansmu at xs4all.nl  Fri Sep  9 06:13:45 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Fri, 09 Sep 2011 12:13:45 +0200
Subject: killing a script
In-Reply-To: <4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
	<mailman.887.1315526624.27778.python-list@python.org>
	<4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e69e6da$0$2551$e4fe514c@news2.news.xs4all.nl>

On 9/09/11 11:07:24, Steven D'Aprano wrote:
> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
> script.py. While script.py is running, it receives the Ctrl-C, the calling
> process does not.

You misinterpret what you are seeing: the calling process *does* receive
the ctrl-C, it just chooses to ignore it.

This is documented behaviour of os.system.  It you don't want this, then
use the subprocess module, which does not behave this way.

-- HansM



From duncan.booth at invalid.invalid  Fri Sep  9 06:29:47 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 9 Sep 2011 10:29:47 GMT
Subject: Create an index from a webpage [RANT, DNFTT]
References: <op.v1imgsvpa8ncjz@gnudebst>
	<mailman.891.1315534207.27778.python-list@python.org>
Message-ID: <Xns9F5B73D529CD0duncanbooth@127.0.0.1>

Simon Cropper <simoncropper at fossworkflowguides.com> wrote:

> Certainly doable but 
> considering the shear commonality of this task I don't understand why a 
> simple script does not already exist - hence my original request for 
> assistance.

I think you may have underestimated the complexity of the task in general.

To do it for a remote website you need to specify what you consider to be a 
unique page. Here are some questions:

Is case significant for URLs (technically it always is, but IIS sites tend 
to ignore it and to contain links with random permutations of case)?

Are there any query parameters that make two pages distinct? Or any 
parameters that you should ignore? Is the order of parameters significant? 
I recently came across a site that not only had multiple links to identical 
pages with the query parameters in different order but also used a non-
standard % to separate parameters instead of &: it's not so easy getting 
crawlers to handle that mess.

Even after ignoring query parameters are there a finite number of pages to 
the site?
For example, Apache has a spelling correction module that can effectively 
allow any number of spurious subfolders: I've seen a site where 
"/folder1/index.html" had a link to "folder2/index.html" and 
"/folder2/index.html" linked to "folder1/index.html". Apache helpfully 
accepted /folder2/folder1/ as equivalent to /folder1/ and therefore by 
extension also accepted /folder2/folder1/folder2/folder1/...
Zope is also good at creating infinite folder structures.

If you want to spider a remote site then there are plenty of off the shelf 
spidering packages, e.g. httrack. They have a lot of configuration options 
to try to handle the above gotchas.

Your case is probably a lot simpler, but that's just a few reasons why it 
isn't actually a trivial task. Building a list by scanning a bunch of 
folders with html files is comparatively easy which is why that is almost 
always the preferred solution if possible.

-- 
Duncan Booth http://kupuguy.blogspot.com


From __peter__ at web.de  Fri Sep  9 07:04:57 2011
From: __peter__ at web.de (Peter Otten)
Date: Fri, 09 Sep 2011 13:04:57 +0200
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
Message-ID: <j4crsg$5jf$1@solani.org>

Cameron Simpson wrote:

> About the only time I do this is my personal "the()" convenience
> function:
> 
>   def the(list, context=None):
>     ''' Returns the first element of an iterable, but requires there to be
>         exactly one.
>     '''
>     icontext="expected exactly one value"
>     if context is not None:
>       icontext=icontext+" for "+context
> 
>     first=True
>     for elem in list:
>       if first:
>         it=elem
>         first=False
>       else:
>         raise IndexError, "%s: got more than one element (%s, %s, ...)" \
>                           % (icontext, it, elem)
> 
>     if first:
>       raise IndexError, "%s: got no elements" % icontext
>       
>     return it
> 
> Which I use as a definite article in places where an iterable should
> yield exactly one result (eg SQL SELECTs that ought to get exactly
> one hit). I can see I wrote that a long time ago - it could do with some
> style fixes. And a code scan shows it sees little use:-)

A lightweight alternative to that is unpacking:

>>> [x] = ""
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: need more than 0 values to unpack
>>> [x] = "a"
>>> [x] = "ab"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: too many values to unpack



From rosuav at gmail.com  Fri Sep  9 07:30:03 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 21:30:03 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <j4crsg$5jf$1@solani.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
	<j4crsg$5jf$1@solani.org>
Message-ID: <CAPTjJmrU2gxqkbdd-73-gr4crz0MmTwR6FxxP+7FkRUT1CUtjQ@mail.gmail.com>

On Fri, Sep 9, 2011 at 9:04 PM, Peter Otten <__peter__ at web.de> wrote:
>>>> [x] = ""
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ValueError: need more than 0 values to unpack
>>>> [x] = "a"
>>>> [x] = "ab"
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ValueError: too many values to unpack
>

Hey look, it's a new operator - the "assign-sole-result-of-iterable" operator!

x ,= "a"

:)

ChrisA


From esthar777 at gmail.com  Fri Sep  9 07:51:04 2011
From: esthar777 at gmail.com (ESTHU ESHU)
Date: Fri, 9 Sep 2011 04:51:04 -0700 (PDT)
Subject: plz see this
Message-ID: <3285b468-2ddf-4c65-9a1e-357da713b0d6@y8g2000prd.googlegroups.com>

http://123maza.com/65/clock747/


From kandrjoshi at gmail.com  Fri Sep  9 08:07:03 2011
From: kandrjoshi at gmail.com (kaustubh joshi)
Date: Fri, 9 Sep 2011 14:07:03 +0200
Subject: what's the command for (cd ..) in python
Message-ID: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>

Hello friends,
                         How do we carry out the command "*cd ..*" in
python?

My problem is :
I have a set of folders say m=1,2,3,4. In each of these folders, I have
subfolders with common name say m_5,m_6,m_7,m_8. In each of these subfolder,
there is a file which I have edit.
                                          1
         2                                    3
       4
                                         |
          |                                      |
            |

------------------------------------------------------------------------------------------------------------------------------------------
                                  1_5, 1_6, 1_7, 1_8               2_5 ,2_6,
2_7, 2_8           3_5, 3_6, 3_7, 3_8          4_5, 4_6, 4_7, 4_8

That is how I designed it

When I run my script, it follows the route 1 ---> 1_5-----> do the edit job
in the file. Now it need to change the  subfolder from 1_5 to 1_6, which is
not happening.

I created the folders using variable like m for folder taking values 1,2,3,4
and m_n for subfolders with n=5,6,7,8.

I am trying with os.chdir(path), but stuck with how to use m_n in it.

What I am missing at the moment is something that do the job "cd .." does.

Any help


Karan
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From steve+comp.lang.python at pearwood.info  Fri Sep  9 08:16:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 22:16:00 +1000
Subject: killing a script
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
	<mailman.887.1315526624.27778.python-list@python.org>
	<4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<4e69e6da$0$2551$e4fe514c@news2.news.xs4all.nl>
Message-ID: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>

Hans Mulder wrote:

> On 9/09/11 11:07:24, Steven D'Aprano wrote:
>> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
>> script.py. While script.py is running, it receives the Ctrl-C, the
>> calling process does not.
> 
> You misinterpret what you are seeing: the calling process *does* receive
> the ctrl-C, it just chooses to ignore it. 
>
> This is documented behaviour of os.system. 

Documented where? Neither the on-line documentation nor the function
docstring mentions anything about it that I can see:

http://docs.python.org/py3k/library/os.html#os.system

>>> help(os.system)
Help on built-in function system in module posix:

system(...)
    system(command) -> exit_status

    Execute the command (a string) in a subshell.




-- 
Steven



From vlastimil.brom at gmail.com  Fri Sep  9 08:34:59 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 9 Sep 2011 14:34:59 +0200
Subject: what's the command for (cd ..) in python
In-Reply-To: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
References: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
Message-ID: <CAHzaPEOvp_Ly8Gu9-VPfCQ51VLrZDQXTTHO3B=PUt3mORAtPsQ@mail.gmail.com>

2011/9/9 kaustubh joshi <kandrjoshi at gmail.com>:
> Hello friends,
> ???????????????????????? How do we carry out the command "cd .." in python?
>
> My problem is :
> I have a set of folders say m=1,2,3,4. In each of these folders, I have
> subfolders with common name say m_5,m_6,m_7,m_8. In each of these subfolder,
> there is a file which I have edit.
> ????????????????????????????????????????? 1
> ? ? ? ?? 2?????????? ? ? ? ? ? ? ? ? ? ? ? ?? 3
> ? ? ?? 4
> ???????????????????????????????????????? |
> ? ? ? ? ? |????????????? ? ? ? ? ? ? ? ? ? ? ? ? |
> ? ? ? ? ??? |
>
> ------------------------------------------------------------------------------------------------------------------------------------------
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1_5, 1_6, 1_7, 1_8?????????????? 2_5 ,2_6,
> 2_7, 2_8?????????? 3_5, 3_6, 3_7, 3_8????????? 4_5, 4_6, 4_7, 4_8
>
> That is how I designed it
>
> When I run my script, it follows the route 1 ---> 1_5-----> do the edit job
> in the file. Now it need to change the? subfolder from 1_5 to 1_6, which is
> not happening.
>
> I created the folders using variable like m for folder taking values 1,2,3,4
> and m_n for subfolders with n=5,6,7,8.
>
> I am trying with os.chdir(path), but stuck with how to use m_n in it.
>
> What I am missing at the moment is something that do the job "cd .." does.
>
> Any help
>
>
> Karan
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
Hi,
Would maybe adjusting the path like this work?

>>> my_path = "c://d/e/f/g/"
>>> os.path.abspath(my_path + os.pardir)
'c:\\d\\e\\f'
>>>

hth,
  vbr


From steve+comp.lang.python at pearwood.info  Fri Sep  9 09:03:10 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 23:03:10 +1000
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
Message-ID: <4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>

kaustubh joshi wrote:

> Hello friends,
>                          How do we carry out the command "*cd ..*" in
> python?

import os
os.chdir('..')

But think carefully before doing this. Some functions may be confused if you
change directories while they are running. You may be better off staying in
the same directory, and adjusting the path names to the files as you work
with them.



-- 
Steven



From roy at panix.com  Fri Sep  9 09:19:07 2011
From: roy at panix.com (Roy Smith)
Date: Fri, 09 Sep 2011 09:19:07 -0400
Subject: Processing a file using multithreads
References: <mailman.885.1315522214.27778.python-list@python.org>
	<c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>
Message-ID: <roy-77E2CD.09190709092011@news.panix.com>

In article 
<c6cbd486-7e5e-4d26-93b9-088d48a25dea at g9g2000yqb.googlegroups.com>,
 aspineux <aspineux at gmail.com> wrote:

> On Sep 9, 12:49?am, Abhishek Pratap <abhishek.... at gmail.com> wrote:
> > 1. My input file is 10 GB.
> > 2. I want to open 10 file handles each handling 1 GB of the file
> > 3. Each file handle is processed in by an individual thread using the
> > same function ( so total 10 cores are assumed to be available on the
> > machine)
> > 4. There will be 10 different output files
> > 5. once the 10 jobs are complete a reduce kind of function will
> > combine the output.
> >
> > Could you give some ideas ?
> 
> You can use "multiprocessing" module instead of thread to bypass the
> GIL limitation.

I agree with this.

> First cut your file in 10 "equal" parts. If it is line based search 
> for the first line close to the cut. Be sure to have "start" and 
> "end" for each parts, start is the address of the first character of 
> the first line and end is one line too much (== start of the next 
> block)

How much of the total time will be I/O and how much actual processing?  
Unless your processing is trivial, the I/O time will be relatively 
small.  In that case, you might do well to just use the unix 
command-line "split" utility to split the file into pieces first, then 
process the pieces in parallel.  Why waste effort getting the 
file-splitting-at-line-boundaries logic correct when somebody has done 
it for you?


From duncan.booth at invalid.invalid  Fri Sep  9 09:20:54 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 9 Sep 2011 13:20:54 GMT
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
	<4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <Xns9F5B906CD9148duncanbooth@127.0.0.1>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> Thomas Rachel wrote:
> 
>> Am 09.09.2011 07:47 schrieb Oliver:
>>> class Container(object):
>>> """Container to store ??a number of non-overlapping rectangles."""
>>> def __init__(self, xsize=1200, ysize=800):
>>> super(Container, self).__init__(xsize, ysize)
>> 
>> And this is the nonsense: Container derives from object and tries to
>> call its superclass's constructor with 2 parameters - which won't work.
> 
> Not nonsense. Merely a backward-incompatible change:
> 
> 
> [steve at sylar ~]$ python2.2
> Python 2.2.3 (#1, Aug 12 2010, 01:08:27)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> object("two", "parameters")
><object object at 0x92a43e8>
> 
> 
> In Python 2.2, the default object constructor accepts, and ignores, any
> parameters. In Python 2.3 on up, that becomes an error.
> 
More recently than that. It only became an error in 2.6:

[dbooth at localhost ~]$ python2.5 -c "object().__init__(42)"
[dbooth at localhost ~]$ python2.6 -c "object().__init__(42)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
TypeError: object.__init__() takes no parameters


-- 
Duncan Booth http://kupuguy.blogspot.com


From steve+comp.lang.python at pearwood.info  Fri Sep  9 09:41:37 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 23:41:37 +1000
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
	<4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
	<Xns9F5B906CD9148duncanbooth@127.0.0.1>
Message-ID: <4e6a1791$0$29984$c3e8da3$5496439d@news.astraweb.com>

Duncan Booth wrote:

> Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

>> In Python 2.2, the default object constructor accepts, and ignores, any
>> parameters. In Python 2.3 on up, that becomes an error.
>> 
> More recently than that. It only became an error in 2.6:

For __init__, sure, but it was an error for __new__ back in 2.3. Sorry for
not being more clear.



-- 
Steven



From dribnairb at gmail.com  Fri Sep  9 10:29:06 2011
From: dribnairb at gmail.com (Brian)
Date: Fri, 9 Sep 2011 07:29:06 -0700 (PDT)
Subject: Python and Outlook-style rules
Message-ID: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>

I'm about to create a system which will need to allow hundreds of
users to create and maintain their own rules in a similar fashion to
MS Outlook rules. ie.
Each rule consists of one or more user configurable conditions and if/
when the conditions are met then one or more user configurable actions
will be applied.

The conditions will be things like "a specified key in a dictionary is
in a specified list of values" (where the user can choose the key and
the values), or "a specific record is in the specified
database" (where the user chooses the primary key of the record and
the database table to look in).

The actions will be things like "send an email to address" (where the
user chooses the address and the email template to use).

The user will do their configuration in a browser. Also, I need to be
able to continue to add new conditions and actions to the system over
time.

Is there a python module (preferably free/open source) which already
does (some of) this? I can write the back-end logic easily enough
(although I'd rather not re-invent the wheel) but I'd particularly
like to find a widget or similar which will make the front-end look
nice and be cross-browser compatible.



From dreyemi at gmail.com  Fri Sep  9 11:57:38 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Fri, 9 Sep 2011 16:57:38 +0100
Subject: How to structure packages
In-Reply-To: <CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>
Message-ID: <CAPbrmCsR+godv91Huw53Mk8t+R6-Xwr4PGNdWiCjRS+Qp4c9TA@mail.gmail.com>

You might want to have a look at this:
http://www.ccs.neu.edu/home/matthias/htdc.html

On Fri, Sep 9, 2011 at 2:37 AM, Chris Angelico <rosuav at gmail.com> wrote:

> On Fri, Sep 9, 2011 at 10:45 AM, Nobody <nobody at nowhere.com> wrote:
> > The Java compiler also acts as a "make" program. If it doesn't find
> > a .class file for a needed class, it will search for the corresponding
> > .java file and compile that. So to compile a complex program, you only
> > need to compile the top-level file (e.g. HelloWorld.java), and it will
> > compile everything which is required. No Makefile is needed, as the
> > relationship between classes, object files and source files is fixed.
> >
>
> If that's the entire benefit, then I think this is a rather hefty
> price to pay for the elimination of a makefile. Oh wow, I can type
> "javac MyClass.java" and it picks up all the others! If you're
> dividing a project into multiple files already, is it that hard to
> have one more that defines the relationships between the others?
>
> Chris Angelico
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From alec.taylor6 at gmail.com  Fri Sep  9 12:19:48 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 10 Sep 2011 02:19:48 +1000
Subject: Python and Outlook-style rules
In-Reply-To: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>
References: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>
Message-ID: <CAO+9iGcEY-XFmR8hsVYegJ9pg1bcs7d=6z7WP6+DgLRpJQr74w@mail.gmail.com>

Something like this?

http://stackoverflow.com/questions/387606/using-user-input-to-find-information-in-a-mysql-database

On Sat, Sep 10, 2011 at 12:29 AM, Brian <dribnairb at gmail.com> wrote:
> I'm about to create a system which will need to allow hundreds of
> users to create and maintain their own rules in a similar fashion to
> MS Outlook rules. ie.
> Each rule consists of one or more user configurable conditions and if/
> when the conditions are met then one or more user configurable actions
> will be applied.
>
> The conditions will be things like "a specified key in a dictionary is
> in a specified list of values" (where the user can choose the key and
> the values), or "a specific record is in the specified
> database" (where the user chooses the primary key of the record and
> the database table to look in).
>
> The actions will be things like "send an email to address" (where the
> user chooses the address and the email template to use).
>
> The user will do their configuration in a browser. Also, I need to be
> able to continue to add new conditions and actions to the system over
> time.
>
> Is there a python module (preferably free/open source) which already
> does (some of) this? I can write the back-end logic easily enough
> (although I'd rather not re-invent the wheel) but I'd particularly
> like to find a widget or similar which will make the front-end look
> nice and be cross-browser compatible.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From alec.taylor6 at gmail.com  Fri Sep  9 12:38:25 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 10 Sep 2011 02:38:25 +1000
Subject: How to structure packages
In-Reply-To: <CAO+9iGdepoaiz0ycvwkAB4C_LhGSL1OpcvHX1r6zvndoS74CSQ@mail.gmail.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>
	<CAPbrmCsR+godv91Huw53Mk8t+R6-Xwr4PGNdWiCjRS+Qp4c9TA@mail.gmail.com>
	<CAO+9iGdepoaiz0ycvwkAB4C_LhGSL1OpcvHX1r6zvndoS74CSQ@mail.gmail.com>
Message-ID: <CAO+9iGe1CnekpWm0byw5P5Tmmf1gzD0Uew=DJEZ+z8gsZNV0aQ@mail.gmail.com>

Kayode: Are the number of pages in that tutorial planned?

:P

> On Sat, Sep 10, 2011 at 1:57 AM, Kayode Odeyemi <dreyemi at gmail.com> wrote:
>> You might want to have a look at this:
>> http://www.ccs.neu.edu/home/matthias/htdc.html
>>
>> On Fri, Sep 9, 2011 at 2:37 AM, Chris Angelico <rosuav at gmail.com> wrote:
>>>
>>> On Fri, Sep 9, 2011 at 10:45 AM, Nobody <nobody at nowhere.com> wrote:
>>> > The Java compiler also acts as a "make" program. If it doesn't find
>>> > a .class file for a needed class, it will search for the corresponding
>>> > .java file and compile that. So to compile a complex program, you only
>>> > need to compile the top-level file (e.g. HelloWorld.java), and it will
>>> > compile everything which is required. No Makefile is needed, as the
>>> > relationship between classes, object files and source files is fixed.
>>> >
>>>
>>> If that's the entire benefit, then I think this is a rather hefty
>>> price to pay for the elimination of a makefile. Oh wow, I can type
>>> "javac MyClass.java" and it picks up all the others! If you're
>>> dividing a project into multiple files already, is it that hard to
>>> have one more that defines the relationships between the others?
>>>
>>> Chris Angelico
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>
>> --
>> Odeyemi 'Kayode O.
>> http://www.sinati.com. t: @charyorde
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>


From abhishek.vit at gmail.com  Fri Sep  9 13:07:41 2011
From: abhishek.vit at gmail.com (Abhishek Pratap)
Date: Fri, 9 Sep 2011 10:07:41 -0700
Subject: Processing a file using multithreads
In-Reply-To: <roy-77E2CD.09190709092011@news.panix.com>
References: <mailman.885.1315522214.27778.python-list@python.org>
	<c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>
	<roy-77E2CD.09190709092011@news.panix.com>
Message-ID: <CAJbA1KCRKy+0mtnH=psbjiuCqj=9idMy=wi_gHJLrJQ_YC-EYw@mail.gmail.com>

Hi All

@Roy : split in unix sounds good but will it be as efficient as
opening 10 different file handles on a file.  I haven't tried it so
just wondering if you have any experience with it.

Thanks for your input. Also I was not aware of the python's GIL limitation.

My application is not I/O bound as far as I can understand it. Each
line is read and then processed independently of each other. May be
this might sound I/O intensive as #N files will be read but I think if
I have 10 processes running under a parent then it might not be a
bottle neck.

Best,
-Abhi


On Fri, Sep 9, 2011 at 6:19 AM, Roy Smith <roy at panix.com> wrote:
> In article
> <c6cbd486-7e5e-4d26-93b9-088d48a25dea at g9g2000yqb.googlegroups.com>,
> ?aspineux <aspineux at gmail.com> wrote:
>
>> On Sep 9, 12:49?am, Abhishek Pratap <abhishek.... at gmail.com> wrote:
>> > 1. My input file is 10 GB.
>> > 2. I want to open 10 file handles each handling 1 GB of the file
>> > 3. Each file handle is processed in by an individual thread using the
>> > same function ( so total 10 cores are assumed to be available on the
>> > machine)
>> > 4. There will be 10 different output files
>> > 5. once the 10 jobs are complete a reduce kind of function will
>> > combine the output.
>> >
>> > Could you give some ideas ?
>>
>> You can use "multiprocessing" module instead of thread to bypass the
>> GIL limitation.
>
> I agree with this.
>
>> First cut your file in 10 "equal" parts. If it is line based search
>> for the first line close to the cut. Be sure to have "start" and
>> "end" for each parts, start is the address of the first character of
>> the first line and end is one line too much (== start of the next
>> block)
>
> How much of the total time will be I/O and how much actual processing?
> Unless your processing is trivial, the I/O time will be relatively
> small. ?In that case, you might do well to just use the unix
> command-line "split" utility to split the file into pieces first, then
> process the pieces in parallel. ?Why waste effort getting the
> file-splitting-at-line-boundaries logic correct when somebody has done
> it for you?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From tjreedy at udel.edu  Fri Sep  9 13:31:21 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 09 Sep 2011 13:31:21 -0400
Subject: TypeError: object.__init__() takes no parameters
In-Reply-To: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
Message-ID: <j4dij1$4ok$1@dough.gmane.org>

On 9/9/2011 1:47 AM, Oliver wrote:

> If I want to run shapes.py I receive this error message:

Others have explained why code that ran once now does not.

> class Container(object):
>      """Container to store  a number of non-overlapping rectangles."""
>      def __init__(self, xsize=1200, ysize=800):
>          super(Container, self).__init__(xsize, ysize)

Remove this line and the error will go away. It *never* did anything.

>          self.rect = Rectangle(0, 0, xsize, ysize)
>          self.boxes = []
>          self.last_placement_strategy = 0

-- 
Terry Jan Reedy



From dreadpiratejeff at gmail.com  Fri Sep  9 13:32:19 2011
From: dreadpiratejeff at gmail.com (J)
Date: Fri, 9 Sep 2011 13:32:19 -0400
Subject: A bit of a boggle about subprocess.poll() and the codes it receives
	from a process
Message-ID: <CAFB6qZuFNbK80QO6=kdzLZY2RV1w=q35wTzQdxZxJN33iYPg-w@mail.gmail.com>

Hi,

I need a bit of help sorting this out...

I have a memory test script that is a bit of compiled C.  The test itself
can only ever return a 0 or 1 exit code, this is explicitly coded and there
are no other options.

I also have a wrapper test script that calls the C program that should also
only return 0 or 1 on completion.

The problem i'm encountering, however, involves the return code when
subprocess.poll() is called against the running memory test process.  The
current code in my wrapper program looks like this:

def run_processes(self, number, command):
        passed = True
        pipe = []
        for i in range(number):
            pipe.append(self._command(command))
            print "Started: process %u pid %u: %s" % (i, pipe[i].pid,
command)
        sys.stdout.flush()
        waiting = True
        while waiting:
            waiting = False
            for i in range(number):
                if pipe[i]:
                    line = pipe[i].communicate()[0]
                    if line and len(line) > 1:
                        print "process %u pid %u: %s" % (i, pipe[i].pid,
line)
                        sys.stdout.flush()
                    if pipe[i].poll() == -1:
                        waiting = True
                    else:
                        return_value = pipe[i].poll()
                        if return_value != 0:
                            print "Error: process  %u pid %u retuned %u" %
(i, pipe[i].pid, return_value)
                            passed = False
                        print "process %u pid %u returned success" % (i,
pipe[i].pid)
                        pipe[i] = None
        sys.stdout.flush()
        return passed

So what happens here is that in the waiting loop, if pipe[i].poll returns a
-1, we keep waiting, and then if it returns anything OTHER than -1, we exit
and return the return code.

BUT, I'm getting, in some cases, a return code of 127, which is impossible
to get from the memory test program.

The output from this bit of code looks like this in a failing situation:
Error: process 0 pid 2187 retuned 127
process 0 pid 2187 returned success
Error: process 1 pid 2188 retuned 127
process 1 pid 2188 returned success

I'm thinking that I'm hitting some sort of race here where the kernel is
reporting -1 while the process is running, then returns 127 or some other
status when the process is being killed and then finally 0 or 1 after the
process has completely closed out.  I "think" that the poll picks up this
intermediate exit status and immediately exits the loop, instead of waiting
for a 0 or 1.

I've got a modified version that I'm getting someone to test for me now that
changes

 if pipe[i].poll() == -1:
     waiting = True

to this

if pipe[i].poll() not in [0,1]:
    waiting = True

So my real question is: am I on the right track here, and am I correct in my
guess that the kernel is reporting different status codes to
subprocess.poll() during the shutdown of the polled process?
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From tjreedy at udel.edu  Fri Sep  9 13:35:37 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 09 Sep 2011 13:35:37 -0400
Subject: what's the command for (cd ..) in python
In-Reply-To: <4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4dir2$6l8$1@dough.gmane.org>

On 9/9/2011 9:03 AM, Steven D'Aprano wrote:
> kaustubh joshi wrote:
>
>> Hello friends,
>>                           How do we carry out the command "*cd ..*" in
>> python?
>
> import os
> os.chdir('..')
>
> But think carefully before doing this. Some functions may be confused if you
> change directories while they are running. You may be better off staying in
> the same directory, and adjusting the path names to the files as you work
> with them.

Or, use it once at the top of the main module, with an absolute path, to 
make sure you start at a known place where you want to start.

-- 
Terry Jan Reedy



From ray at aarden.us  Fri Sep  9 16:04:30 2011
From: ray at aarden.us (ray)
Date: Fri, 9 Sep 2011 13:04:30 -0700 (PDT)
Subject: Installing 2.6 on Win 7
Message-ID: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>

I have not found binaries for this install.  The page
http://www.python.org/download/windows/
takes me to
http://www.python.org/download/releases/
which goes to
http://www.python.org/download/releases/2.6.7/
Here are Gzip and Bzip tar balls.  The readme files describe linux
builds and the content seems to match.

Are there win binaries or source files?

ray


From brian.curtin at gmail.com  Fri Sep  9 16:14:43 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Fri, 9 Sep 2011 15:14:43 -0500
Subject: Installing 2.6 on Win 7
In-Reply-To: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
References: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
Message-ID: <CAD+XWwpaejEhz8fgJXp+4UMGop9DU=Nw1qyzHi5YEac=P5-hpA@mail.gmail.com>

On Fri, Sep 9, 2011 at 15:04, ray <ray at aarden.us> wrote:
>
> I have not found binaries for this install. ?The page
> http://www.python.org/download/windows/
> takes me to
> http://www.python.org/download/releases/
> which goes to
> http://www.python.org/download/releases/2.6.7/
> Here are Gzip and Bzip tar balls. ?The readme files describe linux
> builds and the content seems to match.
>
> Are there win binaries or source files?

As stated at the top of that page...
"""Python 2.6.7?is a security-fix only source release for Python
2.6.6, fixing several reported security issues. Python 2.6.7 was
released on June 3, 2011."""

If you work backwards, http://www.python.org/download/releases/2.6.6/
is the last version binaries were created for.


From benjamin.kaplan at case.edu  Fri Sep  9 16:17:00 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 9 Sep 2011 16:17:00 -0400
Subject: Installing 2.6 on Win 7
In-Reply-To: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
References: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
Message-ID: <CAMuTYXgd-42Yaa__iv9PBPjdoPFyvfqRAU++bKh85J=koKhO6Q@mail.gmail.com>

On Sep 9, 2011 4:07 PM, "ray" <ray at aarden.us> wrote:
>
> I have not found binaries for this install.  The page
> http://www.python.org/download/windows/
> takes me to
> http://www.python.org/download/releases/
> which goes to
> http://www.python.org/download/releases/2.6.7/
> Here are Gzip and Bzip tar balls.  The readme files describe linux
> builds and the content seems to match.
>
> Are there win binaries or source files?
>
> ray
> --

There is no such thing as the windows source vs. the Linux source. Just
different build files, both of which are in those folders. Since 2.6 is in
security-fix only mode, python.org doesn't provide binaries. You may be able
to find binaries from ActiveState if you don't want to build it yourself.
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From tyler at tysdomain.com  Fri Sep  9 17:00:32 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Fri, 09 Sep 2011 15:00:32 -0600
Subject: what's the command for (cd ..) in python
In-Reply-To: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
References: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
Message-ID: <4E6A7E70.1070807@tysdomain.com>

On 9/9/2011 6:07 AM, kaustubh joshi wrote:
> Hello friends,
>                          How do we carry out the command "*cd ..*" in 
> python?
>
os.chdir, like so:
 >>> os.getcwd()
'/home/tyler'
 >>> os.chdir("../")
 >>> os.getcwd()
'/home'
So you could do something like: os.chdir("../foo")

> My problem is :
> I have a set of folders say m=1,2,3,4. In each of these folders, I 
> have subfolders with common name say m_5,m_6,m_7,m_8. In each of these 
> subfolder, there is a file which I have edit.
>                                           1                            
>                2                                    3                  
>                    4
>                                          |                            
>                 |                                      |              
>                         |
>                                      
> ------------------------------------------------------------------------------------------------------------------------------------------
>                                   1_5, 1_6, 1_7, 1_8               2_5 
> ,2_6, 2_7, 2_8           3_5, 3_6, 3_7, 3_8          4_5, 4_6, 4_7, 4_8
>
> That is how I designed it
>
> When I run my script, it follows the route 1 ---> 1_5-----> do the 
> edit job in the file. Now it need to change the  subfolder from 1_5 to 
> 1_6, which is not happening.
>
> I created the folders using variable like m for folder taking values 
> 1,2,3,4 and m_n for subfolders with n=5,6,7,8.
>
> I am trying with os.chdir(path), but stuck with how to use m_n in it.
>
> What I am missing at the moment is something that do the job "cd .." does.
>
> Any help
>
>
> Karan
>
>
>


-- 

Take care,
Ty
Web: http://tds-solutions.net

Sent from my toaster.

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From tyler at tysdomain.com  Fri Sep  9 17:07:07 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Fri, 09 Sep 2011 15:07:07 -0600
Subject: Installing 2.6 on Win 7
In-Reply-To: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
References: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
Message-ID: <4E6A7FFB.90309@tysdomain.com>

On 9/9/2011 2:04 PM, ray wrote:
> I have not found binaries for this install.  The page
> http://www.python.org/download/windows/
> takes me to
> http://www.python.org/download/releases/
> which goes to
> http://www.python.org/download/releases/2.6.7/
> Here are Gzip and Bzip tar balls.  The readme files describe linux
> builds and the content seems to match.
>
> Are there win binaries or source files?
>
http://www.python.org/getit/releases/2.6.6/
has a release for windows x86 and x64

> ray


-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From stefan-usenet at bytereef.org  Fri Sep  9 17:41:18 2011
From: stefan-usenet at bytereef.org (Stefan Krah)
Date: Fri, 9 Sep 2011 23:41:18 +0200
Subject: try... except with unknown error types
In-Reply-To: <j3m7fe0284i@news3.newsguy.com>
References: <mailman.230.1313780957.27778.python-list@python.org>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.286.1313956388.27778.python-list@python.org>
	<j3m7fe0284i@news3.newsguy.com>
Message-ID: <20110909214118.GA32405@sleipnir.bytereef.org>

Chris Torek <nospam at torek.net> wrote:
> (I have also never been sure whether something is going to raise
> an IOError or an OSError for various OS-related read or write
> operation failures -- such as exceeding a resource limit, for
> instance -- so most places that do I/O operations on OS files, I
> catch both.  Still, it sure would be nice to have a static analysis
> tool that could answer questions about potential exceptions. :-) )

There is an effort to fix this:

http://www.python.org/dev/peps/pep-3151/


And an implementation ...

http://hg.python.org/features/pep-3151/


... together with a feature request:

http://bugs.python.org/issue12555


I think the whole concept makes a lot of sense and is really worth
taking a look at.


Stefan Krah




From cs at zip.com.au  Fri Sep  9 18:29:02 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 10 Sep 2011 08:29:02 +1000
Subject: killing a script
In-Reply-To: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110909222902.GA25985@cskk.homeip.net>

On 09Sep2011 22:16, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
| Hans Mulder wrote:
| > On 9/09/11 11:07:24, Steven D'Aprano wrote:
| >> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
| >> script.py. While script.py is running, it receives the Ctrl-C, the
| >> calling process does not.
| > 
| > You misinterpret what you are seeing: the calling process *does* receive
| > the ctrl-C, it just chooses to ignore it. 
| >
| > This is documented behaviour of os.system. 
| 
| Documented where? Neither the on-line documentation nor the function
| docstring mentions anything about it that I can see:
| 
| http://docs.python.org/py3k/library/os.html#os.system

My copy of the 2.7 docs says:

  This is implemented by calling the Standard C function system(), and
  has the same limitations.

and sure enough, "man 3 system" says:

  The system() function hands the argument command to the command
  interpreter sh(1).  The calling process waits for the shell to finish
  executing the command, ignoring SIGINT and SIGQUIT, and blocking
  SIGCHLD.

os.system() is very convenient for simple stuff, but one size does not
fit all. Continuing with the Python docs for os.system:

  On Unix, the return value is the exit status of the process encoded in
  the format specified for wait().

and it is easy to inspect that value for "the subprocess died from a
signal". Not inspecting the exit status correctly will always be an
opportunity for incorrect app behaviour.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Mac OS X. Because making Unix user-friendly is easier than debugging Windows.
- Mike Dawson, Macintosh Systems Administrator and Consultation.
  mdawson at mac.com http://herowars.onestop.net


From Phillip.M.Feldman at gmail.com  Fri Sep  9 19:45:44 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Fri, 9 Sep 2011 16:45:44 -0700 (PDT)
Subject: can't generate iterator from list
Message-ID: <32435519.post@talk.nabble.com>


It is supposed to be possible to generate a list representation of any
iterator that produces a sequence of finite length, but this doesn't always
work. Here's a case where it does work:

Input:

from itertools import combinations
list(combinations(range(4),2))

Output:

[(0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (2, 3)]

When I define my own classes that produce iterators, conversion to a list
works for some of these classes but not for others. Here's a case where it
doesn't work:

In:  list(balls_in_numbered_boxes(2, [3,3,3]))

Out:

[array([0, 0, 1]),
 array([0, 0, 1]),
 array([0, 0, 1]),
 array([0, 0, 1]),
 array([0, 0, 1])]

Note that if I apply the `next` method to the object, the output is correct:

In [5]: x=balls_in_numbered_boxes(3,[3,3,3])

In [6]: x.next()
Out[6]: array([3, 0, 0])

In [7]: x.next()
Out[7]: array([2, 1, 0])

In [8]: x.next()
Out[8]: array([1, 2, 0])

In [9]: x.next()
Out[9]: array([0, 3, 0])

In [10]: x.next()
Out[10]: array([0, 2, 1])

In [11]: x.next()
Out[11]: array([0, 1, 2])

In [12]: x.next()
Out[12]: array([0, 0, 3])

In [13]: x.next()
---------------------------------------------------------------------------
StopIteration                             Traceback (most recent call last)

Code is attached (see below). Any suggestions as to what's going wrong will
be appreciated.

class balls_in_numbered_boxes(object):
   """
   OVERVIEW

   This class generates an iterator that produces all distinct distributions
of
   indistinguishable balls among numbered boxes with specified capacity
limits.
   (This is a generalization of the most common formulation of the problem,
   where each box is sufficiently large to accommodate all of the balls, and
is
   an important example of a class of combinatorics problems called 'weak
   composition' problems).


   CONSTRUCTOR INPUTS

   n: the number of balls

   limits: This argument is a list of length 1 or greater.  The length of
the
   list corresponds to the number of boxes.  `limits[i]` is a positive
integer
   that specifies the maximum capacity of the ith box.  If `limits[i]`
equals
   `n` (or greater), then the ith box can accommodate all `n` balls and thus
   effectively has unlimited capacity.
   """

   def __init__(self, n=None, limits=None):
      if n < 0 or not isinstance(n,int):
         raise BadInput("The number of balls n must be a non-negative
integer.")

      if not isinstance(limits,list) or len(limits)<1:
         raise BadInput("`limits` must be a non-empty list.")
      for limit in limits:
         if not isinstance(limit,int) or limit<1:
            raise BadInput("Items in `limits` must be positive integers.")

      # Copy constructor inputs to object attributes.  We make a `deepcopy`
of
      # `limits` to protect against the possibility of the calling program
      # modifying it before all calls to the `next` method have been
completed.
      self.n= n
      self.limits= deepcopy(limits)
      self.distribution= None


   def __iter__(self):
      return self


   def next(self):

      # If `self.distribution` is `None`, this is the initial call to
`next`,
      # in which case we generate the initial distribution by assigning as
many
      # balls as possible to the first box, as many balls that remain to the
      # next box, and so on.
      if self.distribution is None:
         self.distribution= zeros(len(self.limits), dtype='i4')

         balls= self.n

         for box in xrange(len(self.limits)):

            # Store as many balls as possible in the current box:
            self.distribution[box]= min(balls,self.limits[box])
            balls-= self.distribution[box]
            if balls == 0: break

         else:

            # We fell through the above loop, which means that it was
impossible
            # to distribute all of the balls:
            raise BadInput("The total capacity of the boxes is less than the
"
              "number of balls to be distributed.")

         # Make first box the "current" box, i.e., the box from which a ball
         # will be moved when the `next` method is invoked:
         self.box= 0

         return self.distribution

      # `self.distribution` is not `None`, which means that this is not the
      # initial invocation of `next`.  We create the next distribution by
moving
      # one ball to the right, unless this is impossible.

      self.distribution[self.box]-= 1

      for box in xrange(self.box+1,len(self.limits)):

         # If this box is full, advance to the next one:
         if self.distribution[box] == self.limits[box]: continue
         self.distribution[box]+= 1
         break

      else:

         # We fell through the above loop, which means that it was
impossible
         # to find a new home for the ball that we were trying to move.
         raise StopIteration

      # If the current box--the box from which we have been removing balls--
is
      # empty, advance to the next box:
      if self.distribution[self.box] == 0: self.box+= 1

      return self.distribution
-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32435519.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From Phillip.M.Feldman at gmail.com  Fri Sep  9 20:00:39 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Fri, 9 Sep 2011 17:00:39 -0700 (PDT)
Subject: can't generate list from iterator
In-Reply-To: <32435519.post@talk.nabble.com>
References: <32435519.post@talk.nabble.com>
Message-ID: <32435569.post@talk.nabble.com>


The title should have been "can't generate list from iterator".
-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32435569.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From miki.tebeka at gmail.com  Fri Sep  9 20:07:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 9 Sep 2011 17:07:54 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <mailman.920.1315612886.27778.python-list@python.org>
References: <mailman.920.1315612886.27778.python-list@python.org>
Message-ID: <1fcf2318-7b76-425b-a100-57d3cd5f8e0f@glegroupsg2000goo.googlegroups.com>

1. Can you post the code somewhere where it's indented properly? (http://paste.pocoo.org/)
2. In the list example you call balls_in_numbered_boxes(2, [3,3,3]) but in the interactive example you call balls_in_numbered_boxes(3,[3,3,3])


From miki.tebeka at gmail.com  Fri Sep  9 20:07:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 9 Sep 2011 17:07:54 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <mailman.920.1315612886.27778.python-list@python.org>
References: <mailman.920.1315612886.27778.python-list@python.org>
Message-ID: <1fcf2318-7b76-425b-a100-57d3cd5f8e0f@glegroupsg2000goo.googlegroups.com>

1. Can you post the code somewhere where it's indented properly? (http://paste.pocoo.org/)
2. In the list example you call balls_in_numbered_boxes(2, [3,3,3]) but in the interactive example you call balls_in_numbered_boxes(3,[3,3,3])


From matthew.a.hess at gmail.com  Fri Sep  9 20:19:38 2011
From: matthew.a.hess at gmail.com (matt)
Date: Fri, 9 Sep 2011 17:19:38 -0700 (PDT)
Subject: IOError 35 when trying to read the result of call to urllib2.urlopen
Message-ID: <ca4e297e-2fd9-4881-b89d-9c0f6ab59009@a10g2000prn.googlegroups.com>

I'm using urllib2's urlopen function to post to a service which should
return a rather lengthy JSON object as the body of its response.
Here's the code:

{{{
ctype, body = encode_multipart(fields, files)
url = 'http://someservice:8080/path/to/resource'
headers = {'Content-Type': ctype, 'Content-Length': str(len(body))}
req = urllib2.Request(url, body, headers)
resp = urllib2.urlopen(req)

resp_body = resp.read()
}}}

When I try to look at "resp_body" I get this error:

IOError: [Errno 35] Resource temporarily unavailable

I posted to the same URI using curl and it worked fine, so I don't
think it has to do with the server.

Any thoughts?


From steve+comp.lang.python at pearwood.info  Fri Sep  9 20:55:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 10:55:53 +1000
Subject: can't generate list from iterator [was: can't generate iterator
	from list]
References: <mailman.920.1315612886.27778.python-list@python.org>
Message-ID: <4e6ab59a$0$30002$c3e8da3$5496439d@news.astraweb.com>

Dr. Phillip M. Feldman wrote:

> 
> It is supposed to be possible to generate a list representation of any
> iterator that produces a sequence of finite length, but this doesn't
> always work. Here's a case where it does work:
> 
> Input:
> 
> from itertools import combinations
> list(combinations(range(4),2))
> 
> Output:
> 
> [(0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (2, 3)]
> 
> When I define my own classes that produce iterators, conversion to a list
> works for some of these classes but not for others. Here's a case where it
> doesn't work:
> 
> In:  list(balls_in_numbered_boxes(2, [3,3,3]))
> 
> Out:
> 
> [array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1])]


But it does work -- it generates a list, exactly as expected.

The problem is not that you can't generate a list. The problem is that the
list you generate is not what you expect.

What you have here is a list containing the same array, repeated three
times. When you print the permutations one at a time, you don't notice, but
by collecting them all at once, you see clearly that they are the same
array object. Try this:

combos = list(balls_in_numbered_boxes(2, [3,3,3]))
[id(a) for a in combos]


I expect you will see something like [123456, 123456, 123456].


The simplest fix is to fix the next() method so that it returns a copy of
self.distribution instead of the array itself.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Fri Sep  9 21:02:08 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 11:02:08 +1000
Subject: IOError 35 when trying to read the result of call to
	urllib2.urlopen
References: <ca4e297e-2fd9-4881-b89d-9c0f6ab59009@a10g2000prn.googlegroups.com>
Message-ID: <4e6ab711$0$29975$c3e8da3$5496439d@news.astraweb.com>

matt wrote:

> When I try to look at "resp_body" I get this error:
> 
> IOError: [Errno 35] Resource temporarily unavailable
> 
> I posted to the same URI using curl and it worked fine, so I don't
> think it has to do with the server.

Are your Python code and curl both using the same proxy? It may be that one
is going direct and the other is using a proxy.

Or perhaps the destination is just flaky, and the resource genuinely is
temporarily unavailable. Or it doesn't like your useragent string and is
lying.


-- 
Steven



From ray at aarden.us  Fri Sep  9 21:21:58 2011
From: ray at aarden.us (ray at aarden.us)
Date: Fri, 09 Sep 2011 18:21:58 -0700
Subject: Installing 2.6 on Win 7
Message-ID: <20110909182158.1753ead7c2b35a7d15c5b99498690bcc.e87438b7a8.wbe@email11.secureserver.net>

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From steve+comp.lang.python at pearwood.info  Fri Sep  9 21:25:40 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 11:25:40 +1000
Subject: killing a script
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
	<mailman.917.1315607348.27778.python-list@python.org>
Message-ID: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>

Cameron Simpson wrote:

> On 09Sep2011 22:16, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
> | Hans Mulder wrote:
> | > On 9/09/11 11:07:24, Steven D'Aprano wrote:
> | >> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation
> | >> of script.py. While script.py is running, it receives the Ctrl-C, the
> | >> calling process does not.
> | > 
> | > You misinterpret what you are seeing: the calling process *does*
> | > receive the ctrl-C, it just chooses to ignore it.
> | >
> | > This is documented behaviour of os.system.
> | 
> | Documented where? Neither the on-line documentation nor the function
> | docstring mentions anything about it that I can see:
> | 
> | http://docs.python.org/py3k/library/os.html#os.system
> 
> My copy of the 2.7 docs says:
> 
>   This is implemented by calling the Standard C function system(), and
>   has the same limitations.
> 
> and sure enough, "man 3 system" says:

I don't consider having to look up documentation for a function in a
completely different language (in this case, C) as "documented behaviour of
os.system". 

Does the C standard define the behaviour of system(), or is that
implementation dependent? It sounds to me that the Python developers are
implicitly refusing responsibility for the detailed behaviour of os.system
by noting that it depends on the C function. What do Jython, PyPy and
IronPython do?

Perhaps the docs for os.system should explicitly note that the behaviour is
implementation dependent, rather than just hint at it. Either that or
explicitly state what os.system does.


> os.system() is very convenient for simple stuff, but one size does not
> fit all. 

I never said it does. Back in my first comment on this thread, I said

"Possibly using the subprocess module may help."


> Continuing with the Python docs for os.system: 
> 
>   On Unix, the return value is the exit status of the process encoded in
>   the format specified for wait().
> 
> and it is easy to inspect that value for "the subprocess died from a
> signal". Not inspecting the exit status correctly will always be an
> opportunity for incorrect app behaviour.

Except that the subprocess can catch the KeyboardInterrupt before exiting,
and there's no guarantee that it will return an appropriate error code.

You're right though, os.system is good for simple stuff and not much more.


-- 
Steven



From rosuav at gmail.com  Fri Sep  9 21:37:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 10 Sep 2011 11:37:53 +1000
Subject: killing a script
In-Reply-To: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
	<mailman.917.1315607348.27778.python-list@python.org>
	<4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmojXCbmo6Q5ZuxC1urOUybu6xrfxq995A6NpKzwPvuNfQ@mail.gmail.com>

On Sat, Sep 10, 2011 at 11:25 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
>> ? This is implemented by calling the Standard C function system(), and
>> ? has the same limitations.
>>
>> and sure enough, "man 3 system" says:
>
> I don't consider having to look up documentation for a function in a
> completely different language (in this case, C) as "documented behaviour of
> os.system".
>

The Python docs chain to the C docs. It'd be nice to have a link
somewhere, but that's platform-dependent - the online docs could link
to an online man page, but local docs can't, etc. It's fairly normal
for high level languages to expose a lot of C API functions, with all
the concerns and features given. Not a lot of point bloating the
Python docs with every little detail, imho.

ChrisA


From tyler at tysdomain.com  Fri Sep  9 23:54:40 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Fri, 09 Sep 2011 21:54:40 -0600
Subject: using python in web applications
Message-ID: <4E6ADF80.7010607@tysdomain.com>

Hello all:
I'm curious if there are some good solutions for using Python in web 
applications.

I'm not feeling particularly masochistic, so I do not want to develop 
this project in PHP; essentially I'm looking to build a web-based MMO. I 
know that you can use nginx with Python with servers like Flask, but I'm 
not really sure how well all of those work. Since this will be a game, I 
can expect quite a few users; I've already got quite a lot of interest. 
I don't much care for PHP, but the thing that can be said for it is it's 
pretty quick. How does Python compare? Are there some solutions (I was 
told about PyPy today) that would be quicker that I could still use for 
the web app? I'm also curious what databases are suggested? I've always 
done most of my work in MYSql, but from what I understand postgresql is 
becoming more popular to.

Thanks all for the input,

-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From ben+python at benfinney.id.au  Sat Sep 10 00:19:22 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 10 Sep 2011 14:19:22 +1000
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <87mxedm3lh.fsf@benfinney.id.au>

"Littlefield, Tyler" <tyler at tysdomain.com> writes:

> I'm curious if there are some good solutions for using Python in web
> applications.

Start with:

<URL:http://docs.python.org/howto/webservers.html#frameworks>
<URL:http://wiki.python.org/moin/WebFrameworks>

and try your criteria against what you find there.

-- 
 \     ?As scarce as truth is, the supply has always been in excess of |
  `\                                       the demand.? ?Josh Billings |
_o__)                                                                  |
Ben Finney


From timr at probo.com  Sat Sep 10 01:43:19 2011
From: timr at probo.com (Tim Roberts)
Date: Fri, 09 Sep 2011 22:43:19 -0700
Subject: Processing a file using multithreads
References: <mailman.885.1315522214.27778.python-list@python.org>
	<c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>
	<roy-77E2CD.09190709092011@news.panix.com>
	<mailman.908.1315588083.27778.python-list@python.org>
Message-ID: <n4ul67tv8aaktl2mqednke7bbdvmodvncu@4ax.com>

Abhishek Pratap <abhishek.vit at gmail.com> wrote:
>
>My application is not I/O bound as far as I can understand it. Each
>line is read and then processed independently of each other. May be
>this might sound I/O intensive as #N files will be read but I think if
>I have 10 processes running under a parent then it might not be a
>bottle neck.

Your conclusion doesn't follow from your premise.  If you are only doing a
little bit of processing on each line, then you almost certainly WILL be
I/O bound.  You will spend most of your time waiting for the disk to
deliver more data.  In that case, multithreading is not a win.  The threads
will all compete with each other for the disk.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From zak.mc.kraken at libero.it  Sat Sep 10 02:23:51 2011
From: zak.mc.kraken at libero.it (Vito 'ZeD' De Tullio)
Date: Sat, 10 Sep 2011 08:23:51 +0200
Subject: FYI
Message-ID: <j4evpn$9pb$1@dough.gmane.org>


http://scummos.blogspot.com/2011/09/kdev-python-argument-type-guessing.html

I'm not used to big ide/rad for python... but I think this work is 
excellent!

Are there alternatives (pydev? others?) capable of this sort of thinks (I 
mean "guessing the type" and method autocomplete)

-- 
By ZeD



From __peter__ at web.de  Sat Sep 10 03:05:43 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 09:05:43 +0200
Subject: can't generate iterator from list
References: <32435519.post@talk.nabble.com>
Message-ID: <j4f27q$nkd$1@dough.gmane.org>

Dr. Phillip M. Feldman wrote:

> 
> It is supposed to be possible to generate a list representation of any
> iterator that produces a sequence of finite length, but this doesn't
> always work. Here's a case where it does work:
> 
> Input:
> 
> from itertools import combinations
> list(combinations(range(4),2))
> 
> Output:
> 
> [(0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (2, 3)]
> 
> When I define my own classes that produce iterators, conversion to a list
> works for some of these classes but not for others. Here's a case where it
> doesn't work:
> 
> In:  list(balls_in_numbered_boxes(2, [3,3,3]))
> 
> Out:
> 
> [array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1])]

[snip code where excessive commenting does more bad than good]

The problem is that you return the same mutable object on every next() call. 
Here's a simplified example:

>>> def g(items):
...     x = [None]
...     for item in items:
...             x[0] = item
...             yield x
...
>>> list(g("abc"))
[['c'], ['c'], ['c']]

When you invoke it using next() you are fooled into thinking that it works 
as desired:

>>> it = g("abc")
>>> a = next(it)
>>> a
['a']
>>> b = next(it)
>>> b
['b']

but only until you look back at the previous item:

>>> a
['b']

Once you understand what is going on the fix is easy -- don't reuse the 
mutable object:

>>> def g(items):
...     for item in items:
...             yield [item]
...
>>> list(g("abc"))
[['a'], ['b'], ['c']]




From hetchkay at gmail.com  Sat Sep 10 03:19:42 2011
From: hetchkay at gmail.com (hetchkay)
Date: Sat, 10 Sep 2011 00:19:42 -0700 (PDT)
Subject: Applying a function recursively
Message-ID: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>

Hi,
I want to apply a "convert" function on an object as follows:
If the object is of MyType type, invoke the passed in function.
If the object is a dictionary, apply on the keys and values of the
dictionary recursively.
If the object is a set, list or tuple, apply on each element
recursively.
Else, leave the object as is.

I wrote the following code:
def convert(obj, func):
   if isinstance(obj, MyType):
      return func(obj)
   elif isinstance(obj, dict):
      return dict((convert(key, func), convert(value, func)) for key,
value in obj.iteritems())
   elif isinstance(obj, (list, tuple, set)):
      return obj.__class__(convert(x, func) for x in obj)
   else:
      return obj

Is there a better way to do this?
Is there any way I can make this code faster?

Regards,
Krishnan


From clp2 at rebertia.com  Sat Sep 10 03:40:51 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 10 Sep 2011 00:40:51 -0700
Subject: Applying a function recursively
In-Reply-To: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
Message-ID: <CAMZYqRRiD9QeUqu709=DhRQ5BNiv0qGRMDzHoXF-=56UDSG7Uw@mail.gmail.com>

On Sat, Sep 10, 2011 at 12:19 AM, hetchkay <hetchkay at gmail.com> wrote:
> Hi,
> I want to apply a "convert" function on an object as follows:
> If the object is of MyType type, invoke the passed in function.
> If the object is a dictionary, apply on the keys and values of the
> dictionary recursively.
> If the object is a set, list or tuple, apply on each element
> recursively.
> Else, leave the object as is.
>
> I wrote the following code:
> def convert(obj, func):
> ? if isinstance(obj, MyType):
> ? ? ?return func(obj)
> ? elif isinstance(obj, dict):
> ? ? ?return dict((convert(key, func), convert(value, func)) for key,
> value in obj.iteritems())
> ? elif isinstance(obj, (list, tuple, set)):
> ? ? ?return obj.__class__(convert(x, func) for x in obj)
> ? else:
> ? ? ?return obj
>
> Is there a better way to do this?

None comes to mind.

> Is there any way I can make this code faster?

Possibly, but it involves ignoring subclasses, and may not actually be
faster in your particular case (it comes down to additional function
calls vs. cost of if-elif-else chain). It would be along the lines of:

def convert_mytype(obj, func):
    return func(obj)

def convert_dict(obj, func):
    return dict((convert(key, func), convert(value, func)) for key,
value in obj.iteritems())

def dont_convert(obj, func):
    return obj

TYPE2FUNC = {MyType : convert_mytype, dict : convert_dict, ... }

def convert(obj, func):
    return TYPE2FUNC.get(type(obj), dont_convert)(obj, func)


As they say though, premature optimization is the root of all evil.

Cheers,
Chris
--
http://rebertia.com


From ben+python at benfinney.id.au  Sat Sep 10 04:13:18 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 10 Sep 2011 18:13:18 +1000
Subject: Applying a function recursively
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
Message-ID: <87ipp0n7c1.fsf@benfinney.id.au>

hetchkay <hetchkay at gmail.com> writes:

> Hi,
> I want to apply a "convert" function on an object as follows:
> If the object is of MyType type, invoke the passed in function.
> If the object is a dictionary, apply on the keys and values of the
> dictionary recursively.
> If the object is a set, list or tuple, apply on each element
> recursively.
> Else, leave the object as is.

That smells like a bad design. Why are you using the same function for
al of those different behaviours?

That's not merely rhetorical; the design isn't absolutely wrong. But
it's wrong often enough that you need to have a compelling reason to
make such a complex behaviour in a single function.

I suspect, if you can be explicit about the goal you're aiming for with
this code, a better design can be found that doesn't require all those
polymorphism-breaking type checks.

-- 
 \      ?An expert is a man who has made all the mistakes which can be |
  `\                         made in a very narrow field.? ?Niels Bohr |
_o__)                                                                  |
Ben Finney


From cs at zip.com.au  Sat Sep 10 04:49:38 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 10 Sep 2011 18:49:38 +1000
Subject: killing a script
In-Reply-To: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
References: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110910084938.GA14021@cskk.homeip.net>

On 10Sep2011 11:25, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
| Cameron Simpson wrote:
| > My copy of the 2.7 docs says:
| >   This is implemented by calling the Standard C function system(), and
| >   has the same limitations.
| > and sure enough, "man 3 system" says:
| 
| I don't consider having to look up documentation for a function in a
| completely different language (in this case, C) as "documented behaviour of
| os.system". 

You're kidding, surely? A wrapper function for a system supplied function
should recite everything about the wrapped function's behaviour (including
the system dependent stuff) in the wrapper doco?

| Does the C standard define the behaviour of system(), or is that
| implementation dependent?

The standard specifies the core behaviour - the behaviour guarrenteed to
be present everywhere. Plenty of stuff has platform dependent minor
nuances. As long as portable code relies only on the standard behaviour
everybody wins.

| It sounds to me that the Python developers are
| implicitly refusing responsibility for the detailed behaviour of os.system
| by noting that it depends on the C function.

Of course they are, and they are right to do so. But noting that it
calls the standard function does guarrentee various things about what it
does.

| What do Jython, PyPy and
| IronPython do?
| 
| Perhaps the docs for os.system should explicitly note that the behaviour is
| implementation dependent, rather than just hint at it. Either that or
| explicitly state what os.system does.

I find it hard to understand how anyone can read this text:

  This is implemented by calling the Standard C function system(), and
  has the same limitations

and not imagine it to be dependent on the specification for system().

| > Continuing with the Python docs for os.system: 
| > 
| >   On Unix, the return value is the exit status of the process encoded in
| >   the format specified for wait().
| > 
| > and it is easy to inspect that value for "the subprocess died from a
| > signal". Not inspecting the exit status correctly will always be an
| > opportunity for incorrect app behaviour.
| 
| Except that the subprocess can catch the KeyboardInterrupt before exiting,

This is very true, though such programs usually have a special reason to
do so - the default aborting behaviour is often sufficient.

| and there's no guarantee that it will return an appropriate error code.

Of course. However, the subprocess should still exit with a nonzero exit
status (unless it it written badly). If the caller considers success of
the called program to be important, it should probably be aborting if
the returned value is nonzero anyway.

But yeah, people should probably be reaching for subprocess if they want
to notice SIGINT specially.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

But pessimism IS realism!       - D.L.Bahr


From kushal.kumaran+python at gmail.com  Sat Sep 10 05:19:08 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Sat, 10 Sep 2011 14:49:08 +0530
Subject: A bit of a boggle about subprocess.poll() and the codes it
	receives from a process
In-Reply-To: <CAFB6qZuFNbK80QO6=kdzLZY2RV1w=q35wTzQdxZxJN33iYPg-w@mail.gmail.com>
References: <CAFB6qZuFNbK80QO6=kdzLZY2RV1w=q35wTzQdxZxJN33iYPg-w@mail.gmail.com>
Message-ID: <CAH8GtdM4_kKC4N4zbZ=6ugK_o7e76uPL9ieYg3gA0+vJ_1Wk7g@mail.gmail.com>

On Fri, Sep 9, 2011 at 11:02 PM, J <dreadpiratejeff at gmail.com> wrote:
> Hi,
> I need a bit of help sorting this out...
> I have a memory test script that is a bit of compiled C. ?The test itself
> can only ever return a 0 or 1 exit code, this is explicitly coded and there
> are no other options.
> I also have a wrapper test script that calls the C program that should also
> only return 0 or 1 on completion.
> The problem i'm encountering, however, involves the return code when
> subprocess.poll() is called against the running memory test process. ?The
> current code in my wrapper program looks like this:
> def run_processes(self, number, command):
> ? ? ? ? passed = True
> ? ? ? ? pipe = []
> ? ? ? ? for i in range(number):
> ? ? ? ? ? ? pipe.append(self._command(command))
> ? ? ? ? ? ? print "Started: process %u pid %u: %s" % (i, pipe[i].pid,
> command)
> ? ? ? ? sys.stdout.flush()
> ? ? ? ? waiting = True
> ? ? ? ? while waiting:
> ? ? ? ? ? ? waiting = False
> ? ? ? ? ? ? for i in range(number):
> ? ? ? ? ? ? ? ? if pipe[i]:
> ? ? ? ? ? ? ? ? ? ? line = pipe[i].communicate()[0]
> ? ? ? ? ? ? ? ? ? ? if line and len(line) > 1:
> ? ? ? ? ? ? ? ? ? ? ? ? print "process %u pid %u: %s" % (i, pipe[i].pid,
> line)
> ? ? ? ? ? ? ? ? ? ? ? ? sys.stdout.flush()
> ? ? ? ? ? ? ? ? ? ? if pipe[i].poll() == -1:
> ? ? ? ? ? ? ? ? ? ? ? ? waiting = True
> ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? return_value = pipe[i].poll()
> ? ? ? ? ? ? ? ? ? ? ? ? if return_value != 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? print "Error: process ?%u pid %u retuned %u" %
> (i, pipe[i].pid, return_value)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? passed = False
> ? ? ? ? ? ? ? ? ? ? ? ? print "process %u pid %u returned success" % (i,
> pipe[i].pid)
> ? ? ? ? ? ? ? ? ? ? ? ? pipe[i] = None
> ? ? ? ? sys.stdout.flush()
> ? ? ? ? return passed
> So what happens here is that in the waiting loop, if pipe[i].poll returns a
> -1, we keep waiting, and then if it returns anything OTHER than -1, we exit
> and return the return code.

Does self._command return a subprocess.Popen object?  The
documentation at
http://docs.python.org/library/subprocess.html#subprocess.Popen.poll
says that the poll method sets and returns the returncode attribute.
returncode is expected to be None until the process terminates, and a
negative value indicates that the subprocess has been terminated
because of a signal.  If poll() returns -1, it means that the process
has been terminated by signal number 1 (probably SIGHUP).

> BUT, I'm getting, in some cases, a return code of 127, which is impossible
> to get from the memory test program.
> The output from this bit of code looks like this in a failing situation:
> Error: process 0 pid 2187 retuned 127
> process 0 pid 2187 returned success
> Error: process 1 pid 2188 retuned 127
> process 1 pid 2188 returned success
> I'm thinking that I'm hitting some sort of race here where the kernel is
> reporting -1 while the process is running, then returns 127 or some other
> status when the process is being killed and then finally 0 or 1 after the
> process has completely closed out. ?I "think" that the poll picks up this
> intermediate exit status and immediately exits the loop, instead of waiting
> for a 0 or 1.
> I've got a modified version that I'm getting someone to test for me now that
> changes
> ?if pipe[i].poll() == -1:
> ? ? ?waiting = True
> to this
> if pipe[i].poll() not in [0,1]:
> ? ? waiting = True
> So my real question is: am I on the right track here, and am I correct in my
> guess that the kernel is reporting different status codes to
> subprocess.poll() during the shutdown of the polled process?
>

I'm unaware of any such race condition.  It is more likely that the
program you are running can return such error codes.  Perhaps you
should examine its stderr output.

It's unclear what you're trying to do here.  If you'd just like to
wait until all the started processes are finished, you should use the
wait() method instead of the poll() method.  You should also note that
the communicate() method already waits for the process to complete, so
further calls to poll() and wait() are superfluous.  Normally, after
communicate() returns, you would simply check pipe[i].returncode and
be on your way.

-- 
regards,
kushal


From nobody at nowhere.com  Sat Sep 10 05:33:03 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 10 Sep 2011 10:33:03 +0100
Subject: try... except with unknown error types
References: <mailman.230.1313780957.27778.python-list@python.org>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.286.1313956388.27778.python-list@python.org>
	<j3m7fe0284i@news3.newsguy.com>
Message-ID: <pan.2011.09.10.09.33.03.485000@nowhere.com>

On Wed, 31 Aug 2011 21:01:34 +0000, Chris Torek wrote:

> Still, it sure would be nice to have a static analysis
> tool that could answer questions about potential exceptions. :-) )

That's an impossibility in a dynamic language.

If you call f.read() where f was passed in as a parameter, the exceptions
which f.read() may throw depend upon exactly what f is; there's no
guarantee that it will actually be a built-in file object, only that it
will have a .read() method (otherwise you will get an AttributeError).

Even if f was returned from open(), there's no guarantee that
__builtins__.open() won't have been replaced by the time of the call.



From nobody at nowhere.com  Sat Sep 10 05:47:29 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 10 Sep 2011 10:47:29 +0100
Subject: killing a script
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
	<mailman.917.1315607348.27778.python-list@python.org>
	<4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.10.09.47.28.932000@nowhere.com>

On Sat, 10 Sep 2011 11:25:40 +1000, Steven D'Aprano wrote:

>> and sure enough, "man 3 system" says:
> 
> I don't consider having to look up documentation for a function in a
> completely different language (in this case, C) as "documented behaviour of
> os.system". 

Well, tough luck. os.system() is a wrapper around the platform's system().
The authors of the Python documentation cannot possibly know what that
function will do on all platforms, even less so once you factor in the
user's ability to replace that function via platform-specific means.

> Does the C standard define the behaviour of system(), or is that
> implementation dependent?

The C99 standard says:

       7.20.4.5  The system function

       Synopsis

       [#1]

               #include <stdlib.h>
               int system(const char *string);

       Description

       [#2] If string  is  a  null  pointer,  the  system  function
       determines  whether  the  host  environment  has  a  command
       processor. If string is  not  a  null  pointer,  the  system
       function  passes  the  string  pointed  to by string to that
       command processor to be  executed  in  a  manner  which  the
       implementation  shall  document;  this  might then cause the
       program calling system to behave in a non-conforming  manner
       or to terminate.

       Returns

       [#3]  If the argument is a null pointer, the system function
       returns nonzero only if a command  processor  is  available.
       If  the  argument  is  not  a  null  pointer, and the system
       function does return, it returns  an  implementation-defined
       value.

It doesn't require a platform to even have a command interpreter, let
alone specify its behaviour. On Unix, system() is defined to use /bin/sh,
which ought to be some kind of Bourne shell; but even then, it might be a
minimal shell such as dash or something with many extensions such as bash.
On Windows, it uses the interpreter specified by the COMSPEC environment
variable, or cmd.exe (NT-based) or command.com (DOS-based) if COMSPEC
isn't set (in either case, PATH is used).

> It sounds to me that the Python developers are
> implicitly refusing responsibility for the detailed behaviour of os.system
> by noting that it depends on the C function.

Indeed. Which is the correct thing to do. Practically every function in
the os module does likewise.

> What do Jython, PyPy and IronPython do?
 
I don't know, but I would expect them to use libc's system() function,
except for Jython which might use java.lang.Runtime.exec().




From nobody at nowhere.com  Sat Sep 10 06:11:37 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 10 Sep 2011 11:11:37 +0100
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<mailman.890.1315532266.27778.python-list@python.org>
Message-ID: <pan.2011.09.10.10.11.37.104000@nowhere.com>

On Fri, 09 Sep 2011 11:37:44 +1000, Chris Angelico wrote:

>> The Java compiler also acts as a "make" program. If it doesn't find
>> a .class file for a needed class, it will search for the corresponding
>> .java file and compile that. So to compile a complex program, you only
>> need to compile the top-level file (e.g. HelloWorld.java), and it will
>> compile everything which is required. No Makefile is needed, as the
>> relationship between classes, object files and source files is fixed.
>>
> 
> If that's the entire benefit, then I think this is a rather hefty
> price to pay for the elimination of a makefile.

It also eliminates the need for TAGS files, browser database (PDB) files,
etc. Once you know the class name, all of the filenames follow from that.

I suspect that the one-to-one correspondence between classes and .class
files is mostly technical (e.g. Java's security model). The one-to-one
correspondence between class files and source files could probably be
relaxed, but at the expense of complicating the IDE and toolchain.

I never saw it as a problem, given that Java is fundamentally class-based:
there are no global variables or functions, only classes.



From __peter__ at web.de  Sat Sep 10 06:17:23 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 12:17:23 +0200
Subject: try... except with unknown error types
References: <mailman.230.1313780957.27778.python-list@python.org>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.286.1313956388.27778.python-list@python.org>
	<j3m7fe0284i@news3.newsguy.com>
Message-ID: <j4fdf5$l0s$4@dough.gmane.org>

Chris Torek wrote:

> >>> import socket
> >>> isinstance(socket.error, IOError)
> False

Here you test if the socket.error *class* is an instance of IOError; this 
would print True if IOError were socket.error's metaclass. However:

>>> isinstance(socket.error(), IOError)
True

or more directly:

>>> issubclass(socket.error, IOError)
True
>>> issubclass(socket.error, EnvironmentError)
True

This is a relatively recent change:

$ python2.5 -c'from socket import error; print issubclass(error, IOError), 
issubclass(error, EnvironmentError)'
False False
$ python2.6 -c'from socket import error; print issubclass(error, IOError), 
issubclass(error, EnvironmentError)'
True True



From rosuav at gmail.com  Sat Sep 10 06:29:57 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 10 Sep 2011 20:29:57 +1000
Subject: How to structure packages
In-Reply-To: <pan.2011.09.10.10.11.37.104000@nowhere.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<mailman.890.1315532266.27778.python-list@python.org>
	<pan.2011.09.10.10.11.37.104000@nowhere.com>
Message-ID: <CAPTjJmoQCZ7RVtN-kU0YvXOrjqAc=6=KLCj+Db16SAnnENRdHg@mail.gmail.com>

On Sat, Sep 10, 2011 at 8:11 PM, Nobody <nobody at nowhere.com> wrote:
> I suspect that the one-to-one correspondence between classes and .class
> files is mostly technical (e.g. Java's security model). The one-to-one
> correspondence between class files and source files could probably be
> relaxed, but at the expense of complicating the IDE and toolchain.

One class per object file isn't a problem - you can always .jar your
classes if the proliferation of small files bothers you, and then it's
just a different way of indexing the mound of code.

One class per source file complicates the human's view in order to
simplify the tools'. Not sure that's really worthwhile.

> I never saw it as a problem, given that Java is fundamentally class-based:
> there are no global variables or functions, only classes.

Yeah... of course you can easily simulate globals with static members
in a dedicated class, but it's slower. THIS, though, is where Java's
security model comes in - you can assign security X to Globals1.class
and security Y to Globals2.class, rather than trying to juggle
security issues in a monolithic "globals" namespace. IMHO it's not
worth the hassle, though. I'd rather just have globals.

ChrisA


From wm at localhost.localdomain  Sat Sep 10 06:32:40 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Sat, 10 Sep 2011 12:32:40 +0200
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <eeimd1h6ntq0$.dlg@localhost.localdomain>

On Fri, 09 Sep 2011 23:03:10 +1000, Steven D'Aprano wrote:
> But think carefully before doing this. Some functions may be confused if you
> change directories while they are running. You may be better off staying in
> the same directory, and adjusting the path names to the files as you work
> with them.

Curious.
Do you mean multi-threaded environment or even in single thread?
If the latter is the case, I'd say those functions make 
very nasty assumptions. Who are they, anyways? ;)

Br.
Waldek


From mark.dufour at gmail.com  Sat Sep 10 07:08:43 2011
From: mark.dufour at gmail.com (Mark Dufour)
Date: Sat, 10 Sep 2011 13:08:43 +0200
Subject: [ANN] Shed Skin 0.9
Message-ID: <CA+m65S00vX2ni-xZxVQO3_iY6bXW7S=A3zpi6+bkWmmvSDwdYQ@mail.gmail.com>

Hi all,

I have just released version 0.9 of Shed Skin, a (restricted-)Python to C++
compiler.

Please see my blog for the full announcement:

http://shed-skin.blogspot.com

The Shed Skin homepage is located here:

http://shedskin.googlecode.com


Thanks!
Mark Dufour.
-- 
http://www.youtube.com/watch?v=E6LsfnBmdnk
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From steve+comp.lang.python at pearwood.info  Sat Sep 10 07:11:32 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 21:11:32 +1000
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<eeimd1h6ntq0$.dlg@localhost.localdomain>
Message-ID: <4e6b45e6$0$29970$c3e8da3$5496439d@news.astraweb.com>

Waldek M. wrote:

> On Fri, 09 Sep 2011 23:03:10 +1000, Steven D'Aprano wrote:
>> But think carefully before doing this. Some functions may be confused if
>> you change directories while they are running. You may be better off
>> staying in the same directory, and adjusting the path names to the files
>> as you work with them.
> 
> Curious.
> Do you mean multi-threaded environment or even in single thread?
> If the latter is the case, I'd say those functions make
> very nasty assumptions. Who are they, anyways? ;)

The main one that comes to mind is os.walk, which has this to say:

    Caution:  if you pass a relative pathname for top, don't change the
    current working directory between resumptions of walk.  walk never
    changes the current directory, and assumes that the client doesn't
    either.

Seems like a reasonable assumption to me.

-- 
Steven



From laddosingh at gmail.com  Sat Sep 10 07:20:17 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sat, 10 Sep 2011 04:20:17 -0700 (PDT)
Subject: Doctest failing
Message-ID: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>

Hi guys.

I'm strugglin with some homework stuff and am hoping you can help me
out here.

This is the code:

small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')

def book_title(title):
    """ Takes a string and returns a title-case string.
    All words EXCEPT for small words are made title case
    unless the string starts with a preposition, in which
    case the word is correctly capitalized.
    >>> book_title('DIVE Into python')
    'Dive into Python'
    >>> book_title('the great gatsby')
    'The Great Gatsby'
    >>> book_title('the WORKS OF AleXANDer dumas')
    'The Works of Alexander Dumas'
    """
    new_title = []
    title_split = title.strip().lower().split()
    for word in title_split:
        if title_split[0] in small_words:
            new_title.append(word.title())
        elif word in small_words:
            new_title.append(word.lower())
        else:
            new_title.append(word.title())
    return(' '.join(new_title))

def _test():
    import doctest, refactory
    return doctest.testmod(refactory)
if __name__ == "__main__":
    _test()

All tests are failing even though I am getting the correct output on
the first two tests. And the last test still gives me "Of" instead of
"of"

Any help is appreciated.

Rgds

T


From mwilson at the-wire.com  Sat Sep 10 07:43:38 2011
From: mwilson at the-wire.com (Mel)
Date: Sat, 10 Sep 2011 07:43:38 -0400
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <j4fihi$5ao$1@speranza.aioe.org>

Tigerstyle wrote:

> Hi guys.
> 
> I'm strugglin with some homework stuff and am hoping you can help me
> out here.
> 
> This is the code:
> 
> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> 
> def book_title(title):
>     """ Takes a string and returns a title-case string.
>     All words EXCEPT for small words are made title case
>     unless the string starts with a preposition, in which
>     case the word is correctly capitalized.
>     >>> book_title('DIVE Into python')
>     'Dive into Python'
>     >>> book_title('the great gatsby')
>     'The Great Gatsby'
>     >>> book_title('the WORKS OF AleXANDer dumas')
>     'The Works of Alexander Dumas'
>     """
>     new_title = []
>     title_split = title.strip().lower().split()
>     for word in title_split:
>         if title_split[0] in small_words:
>             new_title.append(word.title())
>         elif word in small_words:
>             new_title.append(word.lower())
>         else:
>             new_title.append(word.title())
>     return(' '.join(new_title))
> 
> def _test():
>     import doctest, refactory
>     return doctest.testmod(refactory)
> if __name__ == "__main__":
>     _test()
> 
> All tests are failing even though I am getting the correct output on
> the first two tests. And the last test still gives me "Of" instead of
> "of"
> 
> Any help is appreciated.

I don't know about doctest -- I suspect it wants a structured docstring to 
specify the tests -- but this

        if title_split[0] in small_words:
            new_title.append(word.title())

can't be what you want.

	Mel.



From __peter__ at web.de  Sat Sep 10 07:47:04 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 13:47:04 +0200
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <j4fin9$ibm$2@dough.gmane.org>

Tigerstyle wrote:

> I'm strugglin with some homework stuff and am hoping you can help me
> out here.
> 
> This is the code:
> 
> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')

>     new_title = []
>     title_split = title.strip().lower().split()
>     for word in title_split:
>         if title_split[0] in small_words:
>             new_title.append(word.title())
>         elif word in small_words:
>             new_title.append(word.lower())
>         else:
>             new_title.append(word.title())

The logic of the for-loop is flawed; the expression 

title_split[0] in small_words

will always evaluate to True if the first word is a "small word", even when 
the loop is already past the first word. You can work around that with a 
flag along these lines

first = True
for word in title_split:
    if first:
        # special treatment for the first word
        first = False
    else:
        # put checks for all words but the first here
    new_title.append(fixed_word) # assuming you have stored the titlecased
                                 # or lowercased word in the fixed_word
                                 # variable



From t at jollybox.de  Sat Sep 10 07:50:14 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sat, 10 Sep 2011 13:50:14 +0200
Subject: Doctest failing
In-Reply-To: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <4E6B4EF6.6050200@jollybox.de>

On 10/09/11 13:20, Tigerstyle wrote:
> Hi guys.
> 
> I'm strugglin with some homework stuff and am hoping you can help me
> out here.
>
> All tests are failing even though I am getting the correct output on
> the first two tests. And the last test still gives me "Of" instead of
> "of"

Cannot reproduce. I only get the one, expected, failure.

% python -m doctest books.py
**********************************************************************
File "books.py", line 12, in books.book_title
Failed example:
    book_title('the WORKS OF AleXANDer dumas')
Expected:
    'The Works of Alexander Dumas'
Got:
    'The Works Of Alexander Dumas'
**********************************************************************
1 items had failures:
   1 of   3 in books.book_title
***Test Failed*** 1 failures.

>
> def _test():
>     import doctest, refactory
>     return doctest.testmod(refactory)
> if __name__ == "__main__":
>     _test()
>

What is this "refactory"? Are you testing the right code? What is the
output of your test - does it make sense for the module?

Thomas


From dreyemi at gmail.com  Sat Sep 10 07:58:35 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sat, 10 Sep 2011 12:58:35 +0100
Subject: test if a subclass inherits a superclass method
Message-ID: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>

Hello,

I'm testing Python's class abstractness and inheritance. Since interface
doesn't exist, I will
like to test how to have access to a superclass method from a subclass
without necessary
invoking or overriding the superclass method in its subclass.

>>> class Equipment(object):
...     def fault():
...             return "fault"
...
>>> Equipment().__class__
<class '__main__.Equipment'>
>>> class Vehicle(Equipment):
...      # Find out here if Vehicle has access to fault

I want to know whether Vehicle has access to Equipment's fault() method.
Just want to know if it's there(that a vehicle can also develop a fault).

I know I can override it, but I want to know if I can use it directly
without overriding it.
-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From dreyemi at gmail.com  Sat Sep 10 08:05:08 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sat, 10 Sep 2011 13:05:08 +0100
Subject: test if a subclass inherits a superclass method
In-Reply-To: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
References: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
Message-ID: <CAPbrmCtFwcOrOCEjuyyAqK9iEkN5hXovcmMSOaBtd3GtOLkHhg@mail.gmail.com>

On Sat, Sep 10, 2011 at 12:58 PM, Kayode Odeyemi <dreyemi at gmail.com> wrote:

> Hello,
>
> I'm testing Python's class abstractness and inheritance. Since interface
> doesn't exist, I will
> like to test how to have access to a superclass method from a subclass
> without necessary
> invoking or overriding the superclass method in its subclass.
>
> >>> class Equipment(object):
> ...     def fault():
> ...             return "fault"
> ...
> >>> Equipment().__class__
> <class '__main__.Equipment'>
> >>> class Vehicle(Equipment):
> ...      # Find out here if Vehicle has access to fault
>
> I want to know whether Vehicle has access to Equipment's fault() method.
> Just want to know if it's there(that a vehicle can also develop a fault).
>
> I know I can override it, but I want to know if I can use it directly
> without overriding it.
>

OK! I figured it out like this:

>>> v = Vehicle()
>>> dir(v)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__',
'__getattribut
e__', '__hash__', '__init__', '__module__', '__new__', '__reduce__',
'__reduce_e
x__', '__repr__', '__setattr__', '__sizeof__', '__str__',
'__subclasshook__', '_
_weakref__', 'fault']

Cool stuff.

-- 
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>
>


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From alister.ware at ntlworld.com  Sat Sep 10 08:24:25 2011
From: alister.ware at ntlworld.com (Alister Ware)
Date: Sat, 10 Sep 2011 12:24:25 GMT
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <ZFIaq.3398$GZ.577@newsfe03.ams2>

On Sat, 10 Sep 2011 04:20:17 -0700, Tigerstyle wrote:

> Hi guys.
> 
> I'm strugglin with some homework stuff and am hoping you can help me out
> here.
> 
> This is the code:
> 
> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> 
> def book_title(title):
>     """ Takes a string and returns a title-case string. All words EXCEPT
>     for small words are made title case unless the string starts with a
>     preposition, in which case the word is correctly capitalized.
>     >>> book_title('DIVE Into python')
>     'Dive into Python'
>     >>> book_title('the great gatsby')
>     'The Great Gatsby'
>     >>> book_title('the WORKS OF AleXANDer dumas')
>     'The Works of Alexander Dumas'
>     """
>     new_title = []
>     title_split = title.strip().lower().split()
>     for word in title_split:
>         if title_split[0] in small_words:
>             new_title.append(word.title())
>         elif word in small_words:
>             new_title.append(word.lower())
>         else:
>             new_title.append(word.title())
>     return(' '.join(new_title))
> 
> def _test():
>     import doctest, refactory return doctest.testmod(refactory)
> if __name__ == "__main__":
>     _test()
> 
> All tests are failing even though I am getting the correct output on the
> first two tests. And the last test still gives me "Of" instead of "of"
> 
> Any help is appreciated.
> 
> Rgds
> 
> T

Ignoring the docttests my process would be to process each word & then 
manually capitalize he 1st word, .I would als0 use a comprehension as 
makes for cleaner code:-

small_words=('into','the','a','of','at','in','for','on')

def capitalize(word):
    if word in small_words:
        return word
    else:
        return word.title()

def set_title(phrase):
    result=[ capitalize(x.lower()) for x in phrase.split(' ') ]
    result[0]=result[0].title()
    return " ".join(result)


print set_title('the works of alexander dumas')


-- 
... I don't like FRANK SINATRA or his CHILDREN.


From hetchkay at gmail.com  Sat Sep 10 09:28:49 2011
From: hetchkay at gmail.com (hetchkay)
Date: Sat, 10 Sep 2011 06:28:49 -0700 (PDT)
Subject: Applying a function recursively
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
	<87ipp0n7c1.fsf@benfinney.id.au>
Message-ID: <4ee53496-ebec-4ee5-be0c-de344ac586c8@y39g2000prd.googlegroups.com>

>
> I suspect, if you can be explicit about the goal you're aiming for with
> this code, a better design can be found that doesn't require all those
> polymorphism-breaking type checks.
>
It is difficult to explain what I am trying to do, but let me try. I
am mapping data from one hierarchy into another. The mapping rules are
quite complex. I developed a system such that the rules could be
defined as "expressions" of the source hierarchy i.e a particular
entry in the target hierarchy could be represented as an expression of
entries in the source hierarchy. Suppose a point is stored in x, y
coordinates in the source hierarchy, and in polar coordinates in the
target hierarchy, I could write (forget for the moment what sourcePt
is):
pointMapping = {
  sourcePt.key : dict(
     radius = Sqrt(sourcePt.value['x']**2 + sourcePt.value['y']**2),
     angle = Atan(sourcePt.value['y']/sourcePt.value['x']),
   ),
}
The above dictionary is delay-evaluated. sourcePt is an instance of a
class that facilitates the delayed evaluation. Sqrt, Atan etc. are
wrappers to the math functions to facilitate delayed evaluation. When
I encounter a point object, I could 'evaluate' the above mapping for
the point object to get the target dictonary.
The actual requirements are much more involved than this. The
motivation of the design was to enable application developers (who are
not experts in python) to be able to write the mappings. The mappings
also need to be readable.
You could consider this to be some sort of DSL. However, because of
the number of rules involved, I am trying to be as close to Python
expressions as possible. If the target setting is to be a tuple, for
example, I want to be able to write the tuple directly as "( expr1,
expr2 )", rather than, say, "Tuple(expr1, expr2)".
There is also a requirement to validate the mapping on load so that
run-time errors are minimized.
The system we are developing is quite reusable and we have been able
to use it for three different mappings so far. At this point, I am
trying to profile the code and noticed that a non-trivial amount of
time is being spent in the particular function I mentioned in this
thread.

Regards,
Krishnan


From wm at localhost.localdomain  Sat Sep 10 09:57:16 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Sat, 10 Sep 2011 15:57:16 +0200
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<eeimd1h6ntq0$.dlg@localhost.localdomain>
	<4e6b45e6$0$29970$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <5yll66t4xv3j.dlg@localhost.localdomain>

On Sat, 10 Sep 2011 21:11:32 +1000, Steven D'Aprano wrote:
> The main one that comes to mind is os.walk, which has this to say:
> 
>     Caution:  if you pass a relative pathname for top, don't change the
>     current working directory between resumptions of walk.  walk never
>     changes the current directory, and assumes that the client doesn't
>     either.
> 
> Seems like a reasonable assumption to me.

Oh, that kind of functions.
Yes, that *is* surely reasonable, just as mixing chdir/mkdir/remove
and whatever else that affects the directory structure is not a good idea,
or at least something to be done carefully.
I just wouldn't think to give it some special credit.

Thanks
Waldek


From tyler at tysdomain.com  Sat Sep 10 10:04:24 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 08:04:24 -0600
Subject: How to structure packages
In-Reply-To: <pan.2011.09.10.10.11.37.104000@nowhere.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>	<mailman.842.1315416661.27778.python-list@python.org>	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>	<pan.2011.09.09.00.45.41.959000@nowhere.com>	<mailman.890.1315532266.27778.python-list@python.org>
	<pan.2011.09.10.10.11.37.104000@nowhere.com>
Message-ID: <4E6B6E68.9010908@tysdomain.com>

On 9/10/2011 4:11 AM, Nobody wrote:
> On Fri, 09 Sep 2011 11:37:44 +1000, Chris Angelico wrote:
>
>>> The Java compiler also acts as a "make" program. If it doesn't find
>>> a .class file for a needed class, it will search for the corresponding
>>> .java file and compile that. So to compile a complex program, you only
>>> need to compile the top-level file (e.g. HelloWorld.java), and it will
>>> compile everything which is required. No Makefile is needed, as the
>>> relationship between classes, object files and source files is fixed.
>>>
>> If that's the entire benefit, then I think this is a rather hefty
>> price to pay for the elimination of a makefile.
> It also eliminates the need for TAGS files, browser database (PDB) files,
> etc. Once you know the class name, all of the filenames follow from that.
>
> I suspect that the one-to-one correspondence between classes and .class
> files is mostly technical (e.g. Java's security model). The one-to-one
> correspondence between class files and source files could probably be
> relaxed, but at the expense of complicating the IDE and toolchain.
>
> I never saw it as a problem, given that Java is fundamentally class-based:
> there are no global variables or functions, only classes.
>
Sure there are no global variables, but having one class per file is one 
of the big things I hate about Java. Sure it keeps things organized, but 
that's a bit to much for me.



-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From tyler at tysdomain.com  Sat Sep 10 10:08:28 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 08:08:28 -0600
Subject: test if a subclass inherits a superclass method
In-Reply-To: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
References: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
Message-ID: <4E6B6F5C.8000304@tysdomain.com>

On 9/10/2011 5:58 AM, Kayode Odeyemi wrote:
> Hello,
>
> I'm testing Python's class abstractness and inheritance. Since 
> interface doesn't exist, I will
> like to test how to have access to a superclass method from a subclass 
> without necessary
> invoking or overriding the superclass method in its subclass.
>
> >>> class Equipment(object):
> ...     def fault():
> ...             return "fault"
> ...
> >>> Equipment().__class__
> <class '__main__.Equipment'>
> >>> class Vehicle(Equipment):
> ...      # Find out here if Vehicle has access to fault
>
> I want to know whether Vehicle has access to Equipment's fault() method.
> Just want to know if it's there(that a vehicle can also develop a fault).
>
> I know I can override it, but I want to know if I can use it directly 
> without overriding it.

Perhaps this helps:
http://stackoverflow.com/questions/610883/how-to-know-if-an-object-has-an-attribute-in-python

> -- 
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>


-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.

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From roy at panix.com  Sat Sep 10 10:12:32 2011
From: roy at panix.com (Roy Smith)
Date: Sat, 10 Sep 2011 10:12:32 -0400
Subject: Applying a function recursively
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
	<87ipp0n7c1.fsf@benfinney.id.au>
	<4ee53496-ebec-4ee5-be0c-de344ac586c8@y39g2000prd.googlegroups.com>
Message-ID: <roy-B68F2A.10123210092011@news.panix.com>

In article 
<4ee53496-ebec-4ee5-be0c-de344ac586c8 at y39g2000prd.googlegroups.com>,
 hetchkay <hetchkay at gmail.com> wrote:

[complicated description elided]
> You could consider this to be some sort of DSL. However, because of
> the number of rules involved, I am trying to be as close to Python
> expressions as possible. If the target setting is to be a tuple, for
> example, I want to be able to write the tuple directly as "( expr1,
> expr2 )", rather than, say, "Tuple(expr1, expr2)".
> There is also a requirement to validate the mapping on load so that
> run-time errors are minimized.

I assume by DSL you mean Domain Specific Language?  Having worked with a 
number of DSLs, my emphatic recommendation is DON'T DO IT!

What you will end up with is a language which is almost, but not quite, 
like some other existing language.  That means the people who use it 
will need to learn something new.  If you make it "as close to Python as 
possible", all that will happen is people will assume it's Python, and 
constantly be surprised when things don't work the same way.

Whatever features of "real Python" you left out, people will invariably 
be clamoring for.  Eventually, you will be forced to duct-tape them into 
the language.  You will end up bogged down forever in language 
maintenance, adding features, fixing bugs, writing documentation, 
providing tech support, etc.

Think of all the ecosystem stuff which grows up around a real language.  
Debuggers.  Profilers.  Language-aware editors (or plugins to emacs, 
eclipse, etc).  Add-in libraries to do a zillion things you never 
thought you would want to do.  Hoards of really smart and enthusiastic 
people on mailing lists, newsgroups, Stack Overflow, etc willing to help 
out with problems.  Books.  Professional training courses.  You will end 
up with replicating all that, or doing without.

It sounds like what you really want to do is just use Python as your 
scripting language.  The lazy evaluation features you desire can be 
handled by writing some library code.


From wentlv at gmail.com  Sat Sep 10 11:41:20 2011
From: wentlv at gmail.com (crow)
Date: Sat, 10 Sep 2011 08:41:20 -0700 (PDT)
Subject: Is there anyway to use urllib2 to download a file from http server?
Message-ID: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>

As the title.

Or is there other module that can handle this task?

Many thanks in advance


From stefan_ml at behnel.de  Sat Sep 10 11:53:12 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 10 Sep 2011 17:53:12 +0200
Subject: Is there anyway to use urllib2 to download a file from http
	server?
In-Reply-To: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
References: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
Message-ID: <j4g158$7ss$1@dough.gmane.org>

crow, 10.09.2011 17:41:
> As the title.
>
> Or is there other module that can handle this task?

Did you notice that is has documentation?

http://docs.python.org/library/urllib2.html#examples

Stefan



From rosuav at gmail.com  Sat Sep 10 11:56:32 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 11 Sep 2011 01:56:32 +1000
Subject: Doctest failing
In-Reply-To: <ZFIaq.3398$GZ.577@newsfe03.ams2>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
Message-ID: <CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>

On Sat, Sep 10, 2011 at 10:24 PM, Alister Ware
<alister.ware at ntlworld.com> wrote:
> Ignoring the docttests my process would be to process each word & then
> manually capitalize he 1st word, .I would als0 use a comprehension as
> makes for cleaner code:-
>
> def capitalize(word):
> ? ?if word in small_words:
> ? ? ? ?return word
> ? ?else:
> ? ? ? ?return word.title()

And I'd do this with a lambda, but that's just me. Of course, if your
logic is more complicated, it makes more sense to keep it in a named
function, but a single conditional call can fit nicely into a lambda.

ChrisA


From tjreedy at udel.edu  Sat Sep 10 13:34:19 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 13:34:19 -0400
Subject: [ANN] Shed Skin 0.9
In-Reply-To: <CA+m65S00vX2ni-xZxVQO3_iY6bXW7S=A3zpi6+bkWmmvSDwdYQ@mail.gmail.com>
References: <CA+m65S00vX2ni-xZxVQO3_iY6bXW7S=A3zpi6+bkWmmvSDwdYQ@mail.gmail.com>
Message-ID: <j4g74l$c8u$1@dough.gmane.org>

On 9/10/2011 7:08 AM, Mark Dufour wrote:
> Hi all,
>
> I have just released version 0.9 of Shed Skin, a (restricted-)Python to
> C++ compiler.

That should say "Python2.(4-6) to C++ compiler".

I do not want to pick on Mark, who I think is doing great work, but I 
find it annoying when third-party developers use the generic 'Python' to 
refer to undisclosed older versions of Python.

> Please see my blog for the full announcement:
>
> http://shed-skin.blogspot.com <http://shed-skin.blogspot.com/>

While Mark never reveals this crucial information anywhere on this page,

> The Shed Skin homepage is located here:
>
> http://shedskin.googlecode.com <http://shedskin.googlecode.com/>

he does specify versions in the first sentence of this page. That is 
much better than some other projects.

-- 
Terry Jan Reedy



From abhijeet.manohar at gmail.com  Sat Sep 10 13:37:12 2011
From: abhijeet.manohar at gmail.com (Abhijeet Mahagaonkar)
Date: Sat, 10 Sep 2011 23:07:12 +0530
Subject: Is there anyway to use urllib2 to download a file from http
	server?
In-Reply-To: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
References: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
Message-ID: <CAB7bTqrRnGu=chxrj2PW-QX9Gn9-xta3au=U8daJ1G6p8=_9Zw@mail.gmail.com>

I guess urlretrieve() would do the job

-AB

On Sat, Sep 10, 2011 at 9:11 PM, crow <wentlv at gmail.com> wrote:

> As the title.
>
> Or is there other module that can handle this task?
>
> Many thanks in advance
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tjreedy at udel.edu  Sat Sep 10 13:59:02 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 13:59:02 -0400
Subject: Doctest failing
In-Reply-To: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <j4g8j0$kbf$1@dough.gmane.org>

On 9/10/2011 7:20 AM, Tigerstyle wrote:
> Hi guys.
>
> I'm strugglin with some homework stuff and am hoping you can help me
> out here.

We appreciate you saying so instead of hiding that this is homework.

> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>
> def book_title(title):
>      """ Takes a string and returns a title-case string.
>      All words EXCEPT for small words are made title case
>      unless the string starts with a preposition, in which
>      case the word is correctly capitalized.
>      >>>  book_title('DIVE Into python')
>      'Dive into Python'
>      >>>  book_title('the great gatsby')
>      'The Great Gatsby'
>      >>>  book_title('the WORKS OF AleXANDer dumas')
>      'The Works of Alexander Dumas'
>      """
>      new_title = []
>      title_split = title.strip().lower().split()

>      for word in title_split:
>          if title_split[0] in small_words:
>              new_title.append(word.title())
>          elif word in small_words:
>              new_title.append(word.lower())
>          else:
>              new_title.append(word.title())

The key issue is that you want to treat the first word one way (.title 
it) and the rest differently (conditionally .title or not) . So 
immediately separate the first from the rest and then process each. 
There are at least three ways to do the split. Perhaps I should stop 
with this hint, and certainly you should think a bit before reading 
further, but here is what I consider to be the most elegant 3.2 code.
.
,
,
,
.
.
.
     first, *rest = title.strip().lower().split()
     new_title = [first.title()]
     for word in rest:
         if word not in small_words:
             word = word.title()
         new_title.append(word)

>      return(' '.join(new_title))

doctest.testmod() now passes (there is no 'refactory' here)

> def _test():
>      import doctest, refactory
>      return doctest.testmod(refactory)
> if __name__ == "__main__":
>      _test()

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep 10 15:36:42 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 15:36:42 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
Message-ID: <j4gea4$m3b$1@dough.gmane.org>

Python's iterator protocol for an iterator 'items' allows combinations 
of explicit "next(items)" calls with the implicit calls of a "for item 
in items:" loop. There are at least three situations in which this can 
be useful. (While the code posted here is not testable, being incomplete 
or having pseudocode lines, I have tested full examples of each idiom 
with 3.2.)


1. Process first item of an iterable separately.

A traditional solution is a flag variable that is tested for each item.

first = True
<other setup>
for item in iterable:
   if first:
     <process first>
     first = False
   else:
     <process non-first>

(I have seen code like this posted on this list several times, including 
today.)

Better, to me, is to remove the first item *before* the loop.

items = iter(iterable)
<set up with next(items)
for item in items:
   <process non-first>

Sometimes <other setup> and <process first> can be combined in <setup 
with next(items)>. For instance, "result = []" followed by 
"result.append(process_first(item))" becomes "result = 
[process_first(item)]".

The statement containing the explicit next(items) call can optionally be 
wrapped to explicitly handle the case of an empty iterable in whatever 
manner is desired.

try:
     <set up with next(items)>
except StopIteration:
     raise ValueError("iterable cannot be empty")


For an iterable known to have a small number of items, the first item 
can be removed, with only a small copying penalty, with a simple assignment.

first, *rest = iterable

The older and harder to write version of this requires the iterable to 
be a sequence?

first, rest = seq[0], seq[1:]


2. Process the last item of an iterable differently. As far as I know, 
this cannot be done for a generic iterable with a flag. It requires a 
look ahead.

items = iter(iterable)
current = next(items)
for item in items:
   <process non-last current>
   current = item
<process last current>

To treat both first and last differently, pull off the first before 
binding 'current'. Wrap next() calls as desired.


3. Process the items of an iterable in pairs.

items = iter(iterable)
for first in items:
     second = next(items)
     <process first and second>

This time, StopIteration is raised for an odd number of items. Catch and 
process as desired. One possibility is to raise ValueError("Iterable 
must have an even number of items").

A useful example of just sometimes pairing is iterating a (unicode) 
string by code points ('characters') rather than by code units. This 
requires combining the surrogate pairs used for supplementary characters 
when the units are 16 bits.

chars = iter(string)
for char in chars:
     if is_first_surrogate(char):
         char += next(chars)
     yield char

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep 10 15:36:47 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 15:36:47 -0400
Subject: Doctest failing
In-Reply-To: <j4fin9$ibm$2@dough.gmane.org>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4fin9$ibm$2@dough.gmane.org>
Message-ID: <j4gea8$m3b$2@dough.gmane.org>

On 9/10/2011 7:47 AM, Peter Otten wrote:

> You can work around that with a
> flag along these lines
>
> first = True
> for word in title_split:
>      if first:
>          # special treatment for the first word
>          first = False
>      else:
>          # put checks for all words but the first here
>      new_title.append(fixed_word) # assuming you have stored the titlecased
>                                   # or lowercased word in the fixed_word
>                                   # variable

An alternative to a flag and testing every item is to remove and process 
the first item *before* the loop. See my response on this thread or my 
new thread
Idioms combining 'next(items)' and 'for item in items:'

-- 
Terry Jan Reedy



From Phillip.M.Feldman at gmail.com  Sat Sep 10 15:57:21 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 10 Sep 2011 12:57:21 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <j4f27q$nkd$1@dough.gmane.org>
References: <32435519.post@talk.nabble.com> <j4f27q$nkd$1@dough.gmane.org>
Message-ID: <32439307.post@talk.nabble.com>


Very nice explanation!  I've circumvented the problem by returning a
`deepcopy` of the list.  I've also added an acknowledgment.  The revised
code is attached.

I'd like to see both balls in numbered boxes (this code) and balls in
unnumbered (indistinguishable) boxes in Python's `itertools` module, but
don't know whom to contact about this.  Also, I haven't yet worked out a
good algorithm for balls in unnumbered boxes.  Any suggestions will be
appreciated.

Phillip http://old.nabble.com/file/p32439307/balls_in_numbered_boxes.py
balls_in_numbered_boxes.py 
-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32439307.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From pgiri at yahoo.com  Sat Sep 10 16:05:36 2011
From: pgiri at yahoo.com (Giridhar Pemmasani)
Date: Sat, 10 Sep 2011 13:05:36 -0700 (PDT)
Subject: [ANN] dispy: distribute computations and execute in parallel 
Message-ID: <1315685136.93773.YahooMailNeo@web160614.mail.bf1.yahoo.com>

Hello,

I would like to announce dispy (http://dispy.sf.net) that can
distribute and parallelize computations among computing nodes over
network (yes, yet another implementation of parallelization). This is
useful for problems in SIMD paradigm where a computation can be
executed with multiple data simultaneously. Salient features of dispy
are:

?* Computations (Python functions or standalone programs) and its
? ?dependencies (files, Python functions, classes, modules) are
? ?distributed automatically as and when needed.

?* Computation nodes can be anywhere on the network. For security,
? ?either simple hash based authentication or SSL encryption can be
? ?used.

?* A computation may specify which nodes are allowed to execute it
? ?(for now, using simple patterns of IP addresses).

?* After each execution is finished, the results of execution, output,
? ?errors and exception trace are made available for further
? ?processing.

?* Nodes may become available dynamically: dispy will schedule jobs
? ?whenever a node is available and computations can use that node. If
? ?a node fails while executing scheduled jobs, those jobs may be
? ?resubmitted to other nodes if computations allow it.

?* dispy can be used in a single process to use all the nodes
? ?exclusively (simpler to use) or in multiple processes sharing the
? ?nodes.

Currently dispy works with Python 2.7 and has been tested with nodes
running Linux and OS X.

Thanks,
Giri
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From Phillip.M.Feldman at gmail.com  Sat Sep 10 16:32:49 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 10 Sep 2011 13:32:49 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <32439307.post@talk.nabble.com>
References: <32435519.post@talk.nabble.com> <j4f27q$nkd$1@dough.gmane.org>
	<32439307.post@talk.nabble.com>
Message-ID: <32439439.post@talk.nabble.com>


I just realized that there is a defect in my algorithm, so I will try to code
this using a recursive algorithm instead.

-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32439439.html
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From gelonida at gmail.com  Sat Sep 10 16:43:39 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sat, 10 Sep 2011 22:43:39 +0200
Subject: optionparse: how to add a line break to the help text
Message-ID: <j4gi5r$gjc$1@dough.gmane.org>

I'm having a small question about optionparse.

Normaly optionparser will format the help text according to the
console's width.

I just wondered if there is any way to insert a line breakk into an
options help text.

Example:

from optparse import OptionParser

parser = OptionParser()
parser.add_option("-f", action="store",
    help="This option is really really complicated"
         " and I'd like to write"
         " a few paragrpahs to explain how it works."
         "\nHowever the line breaks are stripped off"
         " and it's thus difficult to structure the help text")

args = ['-h']
parser.parse_args(args)

Is there any trick to force a new paragraph/ line break before the word
'However'?


Thanks in advance for suggestions.




From __peter__ at web.de  Sat Sep 10 16:49:13 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 22:49:13 +0200
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4fin9$ibm$2@dough.gmane.org> <j4gea8$m3b$2@dough.gmane.org>
Message-ID: <j4gifq$ihg$1@dough.gmane.org>

Terry Reedy wrote:

> On 9/10/2011 7:47 AM, Peter Otten wrote:
> 
>> You can work around that with a
>> flag along these lines
>>
>> first = True
>> for word in title_split:
>>      if first:
>>          # special treatment for the first word
>>          first = False
>>      else:
>>          # put checks for all words but the first here
>>      new_title.append(fixed_word) # assuming you have stored the
>>      titlecased
>>                                   # or lowercased word in the fixed_word
>>                                   # variable
> 
> An alternative to a flag and testing every item is to remove and process
> the first item *before* the loop. See my response on this thread or my
> new thread
> Idioms combining 'next(items)' and 'for item in items:'

I reckoned the approach with the flag the most beginner-friendly because you 
don't have to think too hard about the corner-cases, namely

>>> book_title("")
''

When I use the "process first item before the loop" approach I usually end 
up with a helper generator

def _words(words, small_words={w.title(): w for w in small_words}):
    yield next(words)
    for word in words:
        yield small_words[word] if word in small_words else word

def book_title(s):
    return " ".join(_words(iter(s.title().split())))

and the nagging thought that I'm making it more complex than need be.




From tyler at tysdomain.com  Sat Sep 10 16:53:26 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 14:53:26 -0600
Subject: using python in web applications
In-Reply-To: <87mxedm3lh.fsf@benfinney.id.au>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<87mxedm3lh.fsf@benfinney.id.au>
Message-ID: <4E6BCE46.3020002@tysdomain.com>

On 9/9/2011 10:19 PM, Ben Finney wrote:
> "Littlefield, Tyler"<tyler at tysdomain.com>  writes:
>
>> I'm curious if there are some good solutions for using Python in web
>> applications.
> Start with:
>
> <URL:http://docs.python.org/howto/webservers.html#frameworks>
> <URL:http://wiki.python.org/moin/WebFrameworks>
>

Awesome, will do, thanks.

> and try your criteria against what you find there.
>


-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From matthew.a.hess at gmail.com  Sat Sep 10 17:44:01 2011
From: matthew.a.hess at gmail.com (matt)
Date: Sat, 10 Sep 2011 14:44:01 -0700 (PDT)
Subject: IOError 35 when trying to read the result of call to
	urllib2.urlopen
References: <ca4e297e-2fd9-4881-b89d-9c0f6ab59009@a10g2000prn.googlegroups.com>
	<4e6ab711$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <0a79dcd3-92e6-4102-b202-dbb33fce634f@e34g2000prn.googlegroups.com>

On Sep 9, 6:02?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> matt wrote:
> > When I try to look at "resp_body" I get this error:
>
> > IOError: [Errno 35] Resource temporarily unavailable
>
> > I posted to the same URI using curl and it worked fine, so I don't
> > think it has to do with the server.
>
> Are your Python code and curl both using the same proxy? It may be that one
> is going direct and the other is using a proxy.
>
> Or perhaps the destination is just flaky, and the resource genuinely is
> temporarily unavailable. Or it doesn't like your useragent string and is
> lying.
>
> --
> Steven

No proxy.  It's all local over the loopback interface (probably should
have mentioned that).  The service I'm POSTing to is a Python web app
with CherryPy as the framework.  Also, because of some dependency
issues I'm using Python 2.6.


From rafadurancastaneda at gmail.com  Sat Sep 10 18:16:42 2011
From: rafadurancastaneda at gmail.com (=?ISO-8859-1?Q?Rafael_Dur=E1n_Casta=F1eda?=)
Date: Sun, 11 Sep 2011 00:16:42 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <j4gi5r$gjc$1@dough.gmane.org>
References: <j4gi5r$gjc$1@dough.gmane.org>
Message-ID: <4E6BE1CA.9030608@gmail.com>

On 10/09/11 22:43, Gelonida N wrote:
> I'm having a small question about optionparse.
>
> Normaly optionparser will format the help text according to the
> console's width.
>
> I just wondered if there is any way to insert a line breakk into an
> options help text.
>
> Example:
>
> from optparse import OptionParser
>
> parser = OptionParser()
> parser.add_option("-f", action="store",
>      help="This option is really really complicated"
>           " and I'd like to write"
>           " a few paragrpahs to explain how it works."
>           "\nHowever the line breaks are stripped off"
>           " and it's thus difficult to structure the help text")
>
> args = ['-h']
> parser.parse_args(args)
>
> Is there any trick to force a new paragraph/ line break before the word
> 'However'?
>
>
> Thanks in advance for suggestions.
>
>
You can use """ for multiple line texts:
 >>> text = \
... """fsdfsfsdfsdf
...     sfsdfsfsdf
... sdfsdf  s
...
... """
 >>> text
'fsdfsfsdfsdf\n    sfsdfsfsdf\nsdfsdf  s\n\n'




From dribnairb at gmail.com  Sat Sep 10 18:50:09 2011
From: dribnairb at gmail.com (Brian)
Date: Sat, 10 Sep 2011 15:50:09 -0700 (PDT)
Subject: Python and Outlook-style rules
References: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>
	<mailman.906.1315585191.27778.python-list@python.org>
Message-ID: <3a160e5e-0dbe-47e3-9dba-901003041bd4@d12g2000vba.googlegroups.com>

On Sep 9, 5:19?pm, Alec Taylor <alec.tayl... at gmail.com> wrote:
> Something like this?
>
> http://stackoverflow.com/questions/387606/using-user-input-to-find-in...
>

Actually, I'm looking for a framework or something similar - something
more like this, only for python:
http://www.codeproject.com/KB/macros/RulesWizard.aspx


From laurent.payot at gmail.com  Sat Sep 10 19:35:28 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 16:35:28 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>

[troll]
For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
[/troll]

"Eve Online", a well known MMORPG was developped with stackless python : http://highscalability.com/eve-online-architecture

You mentioned nginx so I can tell you I personally use Linux + nginx + mongodb (pymongo) + Python 3 version of cherrypy (with Mako templates) and it's working fine after some tuning.


From laurent.payot at gmail.com  Sat Sep 10 19:35:28 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 16:35:28 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>

[troll]
For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
[/troll]

"Eve Online", a well known MMORPG was developped with stackless python : http://highscalability.com/eve-online-architecture

You mentioned nginx so I can tell you I personally use Linux + nginx + mongodb (pymongo) + Python 3 version of cherrypy (with Mako templates) and it's working fine after some tuning.


From robert.kern at gmail.com  Sat Sep 10 19:44:02 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 10 Sep 2011 18:44:02 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <4E6BE1CA.9030608@gmail.com>
References: <j4gi5r$gjc$1@dough.gmane.org> <4E6BE1CA.9030608@gmail.com>
Message-ID: <j4gso2$i3g$1@dough.gmane.org>

On 9/10/11 5:16 PM, Rafael Dur?n Casta?eda wrote:
> On 10/09/11 22:43, Gelonida N wrote:
>> I'm having a small question about optionparse.
>>
>> Normaly optionparser will format the help text according to the
>> console's width.
>>
>> I just wondered if there is any way to insert a line breakk into an
>> options help text.
>>
>> Example:
>>
>> from optparse import OptionParser
>>
>> parser = OptionParser()
>> parser.add_option("-f", action="store",
>> help="This option is really really complicated"
>> " and I'd like to write"
>> " a few paragrpahs to explain how it works."
>> "\nHowever the line breaks are stripped off"
>> " and it's thus difficult to structure the help text")
>>
>> args = ['-h']
>> parser.parse_args(args)
>>
>> Is there any trick to force a new paragraph/ line break before the word
>> 'However'?
>>
>>
>> Thanks in advance for suggestions.
>>
>>
> You can use """ for multiple line texts:
>  >>> text = \
> ... """fsdfsfsdfsdf
> ... sfsdfsfsdf
> ... sdfsdf s
> ...
> ... """
>  >>> text
> 'fsdfsfsdfsdf\n sfsdfsfsdf\nsdfsdf s\n\n'

That's not the problem. OptionParser removes all of the original newlines that 
are in the given text when it formats the text for display. I don't think there 
is a simple workaround.

-- 
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 cs at zip.com.au  Sat Sep 10 19:50:46 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sun, 11 Sep 2011 09:50:46 +1000
Subject: what's the command for (cd ..) in python
In-Reply-To: <5yll66t4xv3j.dlg@localhost.localdomain>
References: <5yll66t4xv3j.dlg@localhost.localdomain>
Message-ID: <20110910235046.GA12648@cskk.homeip.net>

On 10Sep2011 15:57, Waldek M. <wm at localhost.localdomain> wrote:
| On Sat, 10 Sep 2011 21:11:32 +1000, Steven D'Aprano wrote:
| > The main one that comes to mind is os.walk, which has this to say:
| > 
| >     Caution:  if you pass a relative pathname for top, don't change the
| >     current working directory between resumptions of walk.  walk never
| >     changes the current directory, and assumes that the client doesn't
| >     either.
| > 
| > Seems like a reasonable assumption to me.
| 
| Oh, that kind of functions.
| Yes, that *is* surely reasonable, just as mixing chdir/mkdir/remove
| and whatever else that affects the directory structure is not a good idea,
| or at least something to be done carefully.
| I just wouldn't think to give it some special credit.

It's like umask and friends - they affect a program-wide implicit state.
Umask affects default new file permissions, chdir affects starting point
for relative pathnames, etc. All implicit.

The usual biggie with chdir is that of course your program may have been
handed relative file pathnames on the command line. They need resolving
_before_ any chdiring happens, if chdiring is going to happen.

For this kind of reason chdir, umask et al are generally best used in
top level logic only rather than inside library functions.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

It's hard to believe that something as rational as the metric system was
invented by the French. - Henry O. Farad <lrc at netcom.COM>


From gelonida at gmail.com  Sat Sep 10 20:05:13 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 02:05:13 +0200
Subject: import packet.module without importing packet.__init__ ?
Message-ID: <j4gtvq$vqq$1@dough.gmane.org>

Hi,

I am little shaky with how exactly python imports packages / modules etc.

Is it possible to import a module from a packet without importing its
__init__.py ?


Full example:
==============

# application.py ---------------------
print "starting application"
import mypacket.module1

# mypacket.__init__.py ---------------------
print "importing __init__"


# mypacket.module1.py ---------------------
print "importing module1"



The output, that I get with python 2.6 is
$ python application.py
> starting application
> importing __init__
> importing module1

Under certain circumstances I'd like to avoid the implicit import
of __init__.py

Due to other constrains of my project I am obliged to have a
non empty __init__.py






From Phillip.M.Feldman at gmail.com  Sat Sep 10 20:43:39 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 10 Sep 2011 17:43:39 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
Message-ID: <32440187.post@talk.nabble.com>


I've written a recursive class that creates an iterator to solve a general
formulation of the combinatorics problem known as "balls in numbered boxes"
(also known as "indistinguishable balls in distinguishable boxes").  The
code has been extensively tested and appears to work, but isn't terribly
elegant.  Any suggestions about how to improve it will be appreciated.

Also, I'd like to get this functionality into the Python's `itertools`
module (the present set of combinatorics functions in `itertools` does not
include "balls in boxes").  Does anyone know whom I should contact about
this?

Phillip

http://old.nabble.com/file/p32440187/balls_in_numbered_boxes.py
balls_in_numbered_boxes.py 
-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32440187.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From tyler at tysdomain.com  Sat Sep 10 20:50:21 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 18:50:21 -0600
Subject: using python in web applications
In-Reply-To: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
Message-ID: <4E6C05CD.3010905@tysdomain.com>

On 9/10/2011 5:35 PM, Laurent wrote:
> [troll]
> For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
> [/troll]
>
I replied to that one off list I guess, but I figured Django was way 
more overhead than I wanted, doesn't really fit with solving the speed 
issue.

> "Eve Online", a well known MMORPG was developped with stackless python : http://highscalability.com/eve-online-architecture
>
> You mentioned nginx so I can tell you I personally use Linux + nginx + mongodb (pymongo) + Python 3 version of cherrypy (with Mako templates) and it's working fine after some tuning.

Awesome, thanks. I'm new to this, so some of that flew over my head, but 
I'll take a look at all of them. I'm not sure of the relevance of 
stackless in this case; I was looking into PyPy, but I'm not really sure 
whether that can be connected with nginx. I guess I could just write the 
web server in Python and use it from that point.

-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From steve+comp.lang.python at pearwood.info  Sat Sep 10 20:56:42 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 10:56:42 +1000
Subject: import packet.module without importing packet.__init__ ?
References: <mailman.958.1315699526.27778.python-list@python.org>
Message-ID: <4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>

Gelonida N wrote:


> Is it possible to import a module from a packet without importing its
> __init__.py ?

Untested, but I think so. But you shouldn't. The solution (if it does work,
as I said I haven't tested it) is a hack.

Suppose you have a library like this:

modules/
+-- spam.py
+-- ham.py
+-- package/
    +-- __init__.py
    +-- cheese.py

The directory "modules" is in your Python path, so you can "import spam"
or "import package". The trick is to add "modules/package" to the Python
path so that "import cheese" will find cheese.py directly.

You can do that by manipulating sys.path, or by setting the environment
variable PYTHONPATH.

Another hack would be to add a hard link to the top level:

modules/
+-- spam.py
+-- ham.py
+-- cheese.py <------------+
+-- package/               |
    +-- __init__.py        |
    +-- cheese.py <--------+


This is not a copy, it is a hard link: the same file appears in literally
two places. (But note that not all file systems support hard linking.) Soft
links or shortcuts might also work. Now you can "import cheese".

But generally, you should design your package so that it doesn't matter
whether or not __init__.py is imported first. I see three reasnable
situations:

(1) package.cheese should rely on package, in which case it requires
package.__init__ to be imported first. (Sometimes I put code common to the
entire package in __init__.py.)

(2) Just don't worry about the fact that package.__init__ gets imported
first. Do you have any idea how many modules get imported when Python
starts up? What's one more?

(3) If cheese.py truly is independent of package, then it shouldn't be part
of package. Just make it a stand alone module outside the package
directory, and be done. (Your installer can still treat cheese.py as a
dependency of package, and ensure that they are both installed.)



-- 
Steven



From rhodri at wildebst.demon.co.uk  Sat Sep 10 21:12:26 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 11 Sep 2011 02:12:26 +0100
Subject: optionparse: how to add a line break to the help text
References: <j4gi5r$gjc$1@dough.gmane.org>
	<mailman.952.1315693006.27778.python-list@python.org>
Message-ID: <op.v1mdm0oba8ncjz@gnudebst>

On Sat, 10 Sep 2011 23:16:42 +0100, Rafael Dur?n Casta?eda  
<rafadurancastaneda at gmail.com> wrote:

> On 10/09/11 22:43, Gelonida N wrote:
>> I'm having a small question about optionparse.
>>
>> Normaly optionparser will format the help text according to the
>> console's width.
>>
>> I just wondered if there is any way to insert a line breakk into an
>> options help text.
>>
>> Example:
>>
>> from optparse import OptionParser
>>
>> parser = OptionParser()
>> parser.add_option("-f", action="store",
>>      help="This option is really really complicated"
>>           " and I'd like to write"
>>           " a few paragrpahs to explain how it works."
>>           "\nHowever the line breaks are stripped off"
>>           " and it's thus difficult to structure the help text")
>>
>> args = ['-h']
>> parser.parse_args(args)
>>
>> Is there any trick to force a new paragraph/ line break before the word
>> 'However'?
>>
>>
>> Thanks in advance for suggestions.
>>
>>
> You can use """ for multiple line texts:
>  >>> text = \
> ... """fsdfsfsdfsdf
> ...     sfsdfsfsdf
> ... sdfsdf  s
> ...
> ... """
>  >>> text
> 'fsdfsfsdfsdf\n    sfsdfsfsdf\nsdfsdf  s\n\n'

Unfortunately the help text is formatted using textwrap, which presumes  
that the entire text is a single paragraph.  To get paragraphs in the help  
text, you'll need to write an IndentedHelpFormatter subclass that splits  
the text on "\n\n", textwraps the split string individually, then re-joins  
them.  _format_text() and format_option() look like the methods that would  
need replacing.

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


From gelonida at gmail.com  Sat Sep 10 21:54:57 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 03:54:57 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <op.v1mdm0oba8ncjz@gnudebst>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>
	<op.v1mdm0oba8ncjz@gnudebst>
Message-ID: <j4h4dh$60n$1@dough.gmane.org>

Hi James,

On 09/11/2011 03:12 AM, Rhodri James wrote:
> On Sat, 10 Sep 2011 23:16:42 +0100, Rafael Dur?n Casta?eda
> <rafadurancastaneda at gmail.com> wrote:
> 
>> On 10/09/11 22:43, Gelonida N wrote:
>>>
>>> from optparse import OptionParser
>>>
>>> parser = OptionParser()
>>> parser.add_option("-f", action="store",
>>>      help="This option is really really complicated"
>>>           " and I'd like to write"
>>>           " a few paragrpahs to explain how it works."
>>>           "\nHowever the line breaks are stripped off"
>>>           " and it's thus difficult to structure the help text")
>>>
>>> args = ['-h']
>>> parser.parse_args(args)
>>>
>>> Is there any trick to force a new paragraph/ line break before the word
>>> 'However'?
>>

> 
> Unfortunately the help text is formatted using textwrap, which presumes
> that the entire text is a single paragraph.  To get paragraphs in the
> help text, you'll need to write an IndentedHelpFormatter subclass that
> splits the text on "\n\n", textwraps the split string individually, then
> re-joins them.  _format_text() and format_option() look like the methods
> that would need replacing.
> 

Thanks a lot. Good to know, that there are options, though a little more
complicated than expected.

I'll live withou tthe line break for the time being and will deep dive
lateron, when I really want to insist on pragraphs within a help section.

I like the idea of '\n\n' as paragraph markes.
Long term this could probably even become an enhancement for  optparse
(with an explicit option to enable it in order to break no existing code)




From python.list at tim.thechases.com  Sat Sep 10 22:08:45 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sat, 10 Sep 2011 21:08:45 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <j4h4dh$60n$1@dough.gmane.org>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>
	<j4h4dh$60n$1@dough.gmane.org>
Message-ID: <4E6C182D.60905@tim.thechases.com>

On 09/10/11 20:54, Gelonida N wrote:
>> Unfortunately the help text is formatted using textwrap, which presumes
>> that the entire text is a single paragraph.  To get paragraphs in the
>> help text, you'll need to write an IndentedHelpFormatter subclass that
>> splits the text on "\n\n", textwraps the split string individually, then
>> re-joins them.  _format_text() and format_option() look like the methods
>> that would need replacing.
>
> Thanks a lot. Good to know, that there are options, though a little more
> complicated than expected.

Just in case you want it:

http://bytes.com/topic/python/answers/734066-how-output-newline-carriage-return-optparse

it's come up several times and several years ago I hacked 
together exactly the solution Rhodri mentions.

-tkc




From ting at thsu.org  Sat Sep 10 22:12:37 2011
From: ting at thsu.org (ting at thsu.org)
Date: Sat, 10 Sep 2011 19:12:37 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.933.1315655225.27778.python-list@python.org>
Message-ID: <bc13c81c-11f3-485b-ae17-f31ed6828be3@et6g2000vbb.googlegroups.com>

On Sep 10, 7:47?am, Peter Otten <__pete... at web.de> wrote:
> Tigerstyle wrote:
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> > This is the code:
>
> > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> > ? ? new_title = []
> > ? ? title_split = title.strip().lower().split()
> > ? ? for word in title_split:
> > ? ? ? ? if title_split[0] in small_words:
> > ? ? ? ? ? ? new_title.append(word.title())
> > ? ? ? ? elif word in small_words:
> > ? ? ? ? ? ? new_title.append(word.lower())
> > ? ? ? ? else:
> > ? ? ? ? ? ? new_title.append(word.title())
>
> The logic of the for-loop is flawed; the expression
>
> title_split[0] in small_words
>
> will always evaluate to True if the first word is a "small word", even when
> the loop is already past the first word. You can work around that with a
> flag along these lines
>
> first = True
> for word in title_split:
> ? ? if first:
> ? ? ? ? # special treatment for the first word
> ? ? ? ? first = False
> ? ? else:
> ? ? ? ? # put checks for all words but the first here
> ? ? new_title.append(fixed_word) # assuming you have stored the titlecased
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# or lowercased word in the fixed_word
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# variable

Another way to tackle this is to just capitalize the entire sentence
before returning it.

new_title = []
title_split = title.strip().lower().split()
for word in title_split:
  if word in small_words:
    new_title.append(word.lower())
  else:
    new_title.append(word.title())
return(''.join(new_title).capitalize())

However, I'm only helping with your homework, because I want to point
out that doctest comments should be *readable*. Don't just throw them
in, take the extra 10-15 seconds to make them easier on the eyes. In
the workplace, months will pass before you review this code again, so
you want to make it easier for an older version of yourself to
remember it.

And it takes very little effort to make it readable. Here's your
doctest string, reformatted with just a tiny bit more whitespace. I
even cut out a sentence.

def book_title(title):
  """
  All words EXCEPT for small words are made title case
  unless the string starts with a preposition, in which
  case the word is correctly capitalized.

  >>> book_title('DIVE Into python')
  'Dive into Python'
  >>> book_title('the great gatsby')
  'The Great Gatsby'
  >>> book_title('the WORKS OF AleXANDer dumas')
  'The Works of Alexander Dumas'
  """
--
// T.Hsu


From clp2 at rebertia.com  Sat Sep 10 22:18:47 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 10 Sep 2011 19:18:47 -0700
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <32440187.post@talk.nabble.com>
References: <32440187.post@talk.nabble.com>
Message-ID: <CAMZYqRSLbPz85KpEUH0QWiP=Jf-mUwjy8BGgOsj_mvFsFme_0g@mail.gmail.com>

On Sat, Sep 10, 2011 at 5:43 PM, Dr. Phillip M. Feldman
<Phillip.M.Feldman at gmail.com> wrote:
> I've written a recursive class that creates an iterator to solve a general
> formulation of the combinatorics problem known as "balls in numbered boxes"
> (also known as "indistinguishable balls in distinguishable boxes"). ?The
> code has been extensively tested and appears to work, but isn't terribly
> elegant. ?Any suggestions about how to improve it will be appreciated.

Significantly refactored (but untested) version:
https://gist.github.com/1209079

Cheers,
Chris
--
http://rebertia.com


From gelonida at gmail.com  Sat Sep 10 23:07:28 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 05:07:28 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <4E6C182D.60905@tim.thechases.com>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>	<j4h4dh$60n$1@dough.gmane.org>
	<4E6C182D.60905@tim.thechases.com>
Message-ID: <j4h8lh$qui$1@dough.gmane.org>

Hi Tim,


Thanks a lot!!!



On 09/11/2011 04:08 AM, Tim Chase wrote:
> On 09/10/11 20:54, Gelonida N wrote:
>>> Unfortunately the help text is formatted using textwrap, which presumes
>>> that the entire text is a single paragraph.  To get paragraphs in the
>>> help text, you'll need to write an IndentedHelpFormatter subclass that
>>> splits the text on "\n\n", textwraps the split string individually, then
>>> re-joins them.  _format_text() and format_option() look like the methods
>>> that would need replacing.
> 
> Just in case you want it:
> 
> http://bytes.com/topic/python/answers/734066-how-output-newline-carriage-return-optparse
> 

It works (of course ;-) ) like a charm.
Good to know, that I'm not the only one who want's to structure the help
text a little nicer.

> 
> it's come up several times and several years ago I hacked together
> exactly the solution Rhodri mentions.

Considering, that you posted the snippet in 2007 and this is very
probably a reocurring problem for any slighty more complicated help text
it is really a pity, that it did not become of part of the standard
optparse library :-(


Thanks again.




From jabba.laci at gmail.com  Sat Sep 10 23:20:26 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Sat, 10 Sep 2011 23:20:26 -0400
Subject: download pages using a cookies.txt file
In-Reply-To: <CAMZYqRTEnda-nidjk+uckAOCCx1e8q_kv2GN=8E9WxzSw10Uxg@mail.gmail.com>
References: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
	<CAMZYqRTEnda-nidjk+uckAOCCx1e8q_kv2GN=8E9WxzSw10Uxg@mail.gmail.com>
Message-ID: <CAOuJsMksi5iB6NVXWczWBOU1vNUuUHor+8==VjedyrrCDjJ3yA@mail.gmail.com>

Hi,

Thanks, I could put together the pieces and here is my solution:

(1) get_cookies_in_cookiejar function to extract cookies and put them
in a cookiejar:
https://github.com/jabbalaci/jabbapylib/blob/master/jabbapylib/web/export_firefox_cookies.py

(2) download page using urllib2 and passing the cookiejar:
https://github.com/jabbalaci/jabbapylib/blob/master/jabbapylib/web/web.py
See the bottom with get_page_with_cookies_using_cookiejar(url).

Laszlo


On Mon, Sep 5, 2011 at 22:19, Chris Rebert <clp2 at rebertia.com> wrote:
> On Mon, Sep 5, 2011 at 6:36 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
>> Hi,
>>
>> I would like to download a page that requires authentication with
>> cookies. I've already figured out how to do it with wget (blog post
>> here: http://bit.ly/pp25LP). In short:
>> (1) extract cookies from Firefox's cookies.sqlite and store them in a text file
>> (2) wget --cookies=on --load-cookies=cookies.txt
>> --keep-session-cookies "http://..."
>>
>> My question is: how to do it from Python?
>
> http://docs.python.org/library/cookielib.html#cookielib.MozillaCookieJar
>
> Cheers,
> Chris
>


From laurent.payot at gmail.com  Sat Sep 10 23:21:46 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 20:21:46 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <3c8c4056-aa89-4a7c-a22c-44baf97a02c1@glegroupsg2000goo.googlegroups.com>

Well PyPy is just an implementation of Python among many others (but limited to version 2.7). It is not a web server. If you want to make PyPy interact with a web server (such as nginx) you have to use a special protocol such as WSGI or Fast-CGI. For best performances you can for instance use uWSGI that integrates well with nginx but for this you have to recompile nginx. As you see it's a bit complex, you should read the wikis. May the Force be with you.


From laurent.payot at gmail.com  Sat Sep 10 23:21:46 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 20:21:46 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <3c8c4056-aa89-4a7c-a22c-44baf97a02c1@glegroupsg2000goo.googlegroups.com>

Well PyPy is just an implementation of Python among many others (but limited to version 2.7). It is not a web server. If you want to make PyPy interact with a web server (such as nginx) you have to use a special protocol such as WSGI or Fast-CGI. For best performances you can for instance use uWSGI that integrates well with nginx but for this you have to recompile nginx. As you see it's a bit complex, you should read the wikis. May the Force be with you.


From gelonida at gmail.com  Sat Sep 10 23:39:05 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 05:39:05 +0200
Subject: import packet.module without importing packet.__init__ ?
In-Reply-To: <4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.958.1315699526.27778.python-list@python.org>
	<4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4hagq$3jf$1@dough.gmane.org>

Hi Steven,

Thanks for your answer.

On 09/11/2011 02:56 AM, Steven D'Aprano wrote:
> Gelonida N wrote: 
>> Is it possible to import a module from a packet without importing its
>> __init__.py ?
> 
> Untested, but I think so. But you shouldn't. The solution (if it does work,
> as I said I haven't tested it) is a hack.
> 
> Suppose you have a library like this:
. . .
. . .
> The directory "modules" is in your Python path, so you can "import spam"
> or "import package". The trick is to add "modules/package" to the Python
> path so that "import cheese" will find cheese.py directly.
> 

Yes it's a hack, but good to know it exists. Just in case.

> Another hack would be to add a hard link to the top level:
> 

As you said: Hard links would be a little annoying on some file systems.

> 
> But generally, you should design your package so that it doesn't matter
> whether or not __init__.py is imported first. I see three reasnable
> situations:
> 
> (1) package.cheese should rely on package, in which case it requires
> package.__init__ to be imported first. (Sometimes I put code common to the
> entire package in __init__.py.)
> 
> (2) Just don't worry about the fact that package.__init__ gets imported
> first. Do you have any idea how many modules get imported when Python
> starts up? What's one more?
> 
> (3) If cheese.py truly is independent of package, then it shouldn't be part
> of package. Just make it a stand alone module outside the package
> directory, and be done. (Your installer can still treat cheese.py as a
> dependency of package, and ensure that they are both installed.)
> 


There's still something, that I am philosophycally missing.

Wy do I have to import the entire tree if I'm just interested in a leave.

this is not always desired.

let's imagine

kitchen.__init__
kitchen.knives
kitchen.pans
kitchen.pots


or alternatively
os
os.path
os.wheteverelse

Let's assume, that  kitchen/__init__.py is importing the sub modules
knives, pans and pots

then I understand of course, that the next lines would import the entire
kitchen

> import kitchen # will import all activities
> kitchen.pots.boil(egg)


But if I know that I just want to boil some eggs I would really
appreciate if I could just say

> from kitchen.pot import boil
> boil(eggs)
without having the side effect of getting pans and knives also loaded
into memory.

Moving pots out into a separate package doesn't really feel right.
I agree, that a 10 level deep package tree is not really desirable, but
having every package flat on the top level doesn't sound that good either.

So it seems, that developers of huge packages shouldn't really do a lot
in __init__.py.

Otherwise any user would always 'suck in' the entiry package with all
its sub modules.




To give more details about why I asked this question:

The real setup looks a little different and there are some issues, that
I am having:

One package in question is a huge django application.

Within the package is one module defining some constants and tiny
functions, which I would like to reuse from some command line tools,
which should start quickly without loading any of the django specific
modules. (the startup penalty and the memory overhead would be noticable)

I am using rpc4django, which expects, that __init__.py of the django
application exports some all rpc functions
which will basically import 95% of the django application and the entire
django frame work (none of which were required by my command tool,
support utility for this application)


I could of course create a separate package just for this tiny sub
module, but somehow it doesn't feel right to me.


The second issue is a little more complicated. basically I end up having
circular dependencies.

as I have two applications that  send a few customs django signals forth
an back.

If I wouldn't import __init__.py or if I moved the declaration of the
signals into a third package then circular dependencies would disappear.


So it seems, that if I can't avoid loading __init__.py in
a nice way I have to create  one or two tiny packages outside of my
django application,
or change the python path  as you proposed (increases of course name
space clashes)

or to find a way for rpc4django of loading / locating the rpc functions
without putting them  in __init__.py change the rpc functions such, that
they will only import the other sub modules when being called the first
time (proxies / delayed imports, . . .)





From rosuav at gmail.com  Sat Sep 10 23:53:44 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 11 Sep 2011 13:53:44 +1000
Subject: using python in web applications
In-Reply-To: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
Message-ID: <CAPTjJmrjJ26ofVrz6QFmvE7VkSpTjDdKEjmsLipExrouqHEYJg@mail.gmail.com>

On Sun, Sep 11, 2011 at 9:35 AM, Laurent <laurent.payot at gmail.com> wrote:
> [troll]
> For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
> [/troll]

I have been trolled. :)

For any sort of web-based real-time game, here's two things to avoid:

1) Snoopability and modifiability of crucial data. Everything should
be stored on the server, so that if anyone fiddles, all they do is
break their own client so it has to reload from the server.
2) Massive waste of resources due to unnecessary frameworks/facilities.

I play a lot of Flash games, and right now I'm playing one that has
coped poorly with a miniature slashdotting. A spike in popularity
resulted in a spike in server lag. I fired up a little packet sniffer,
and discovered that every time you do anything in the game, the client
makes a new POST request to its server. Why?! It's not that hard to
hold a socket connection open!

In another context, a similar issue - not a problem as yet (that I
know of), but would be if the system were to be slashdotted. A server
whose sole purpose is to handle script-instigated requests (using HTTP
POST for its transport) sends back a Set-Cookie header with a session
id. This implies that the server is holding session data for all these
clients that are never going to send that cookie back. The server
appears to be IIS with ASP scripts, so presumably stateful sessions
are enabled by default, so it's costing memory and processing to hold,
then discard, all those useless (and probably empty) session state
tags. And presumably many MANY other servers have the same thing.

What's YOUR framework doing that you don't need, and how much is it costing you?

Yeah, I was trolled bad. :)

ChrisA


From bluegene8210 at gmail.com  Sat Sep 10 23:54:01 2011
From: bluegene8210 at gmail.com (=?GB2312?B?wLbJq7v50vI=?=)
Date: Sat, 10 Sep 2011 20:54:01 -0700 (PDT)
Subject: Deadlock problem using multiprocessing
Message-ID: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>

This is my first touch on the multiprocessing module, and I admit not
having a deep understanding of parallel programming, forgive me if
there's any obvious error. This is my test code:

# deadlock.py

import multiprocessing

class MPTask:
	def __init__(self):
		self._tseq= range(10)	# task sequence
		self._pool= multiprocessing.Pool(2)	# process pool
	def _exe(self, num):
		return num**2
	def run(self):
		result= self._pool.map_async(self._exe, self._tseq)
		return result.get()

result= MPTask().run()
print(result)

And seemingly it creates a deadlock, I have to manually kill the
processes in the system monitor, yet it would be OK if the _exe()
function was defined outside the MPTask class:

# no_deadlock.py
import multiprocessing

def _exe(num):
	return num**2

class MPTask:
	def __init__(self):
		self._tseq= range(10)	# task sequence
		self._pool= multiprocessing.Pool(2)	# process pool
	def run(self):
		result= self._pool.map_async(_exe, self._tseq)
		return result.get()

result= MPTask().run()
print(result)

This would give the correct answer without any deadlock. My questions:

1. Why is this, where did the deadlock come from?

2. Besides, is there any material I can refer to about how to avoid
deadlocks when using multiple processes in the program?

Thanks!



From ian.g.kelly at gmail.com  Sun Sep 11 00:01:02 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 10 Sep 2011 22:01:02 -0600
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4gea4$m3b$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
Message-ID: <CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>

On Sat, Sep 10, 2011 at 1:36 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> The statement containing the explicit next(items) call can optionally be
> wrapped to explicitly handle the case of an empty iterable in whatever
> manner is desired.
>
> try:
> ? ?<set up with next(items)>
> except StopIteration:
> ? ?raise ValueError("iterable cannot be empty")

The only time that's optional is when you're writing an iterator and
the try-except would end up looking like this:

try:
    # do stuff with next(items)
except StopIteration:
    raise StopIteration

And even then, it's probably a good idea to clearly document that
you're allowing a StopIteration from one iterator to propagate up as a
StopIteration for another.

Apart from that case, whenever you call next() you should always be
prepared to catch a StopIteration.  Letting a StopIteration propagate
up the stack to parts unknown is bad juju because it's a flow control
exception, not an error-signaling exception.  If it happens to
propagate up to another for loop, then it will break out of the for
loop, and the exception will simply be swallowed.

Cheers,
Ian


From 1248283536 at qq.com  Sun Sep 11 00:46:43 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Sun, 11 Sep 2011 12:46:43 +0800
Subject: convert  time
Message-ID: <tencent_3E32FF310B29A4E4732AB698@qq.com>

how can i convert "Dec 11" into  2011-12?
-------------- next part --------------
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From steve+comp.lang.python at pearwood.info  Sun Sep 11 00:51:18 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 14:51:18 +1000
Subject: import packet.module without importing packet.__init__ ?
References: <mailman.958.1315699526.27778.python-list@python.org>
	<4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>
	<mailman.967.1315712363.27778.python-list@python.org>
Message-ID: <4e6c3e47$0$29999$c3e8da3$5496439d@news.astraweb.com>

Gelonida N wrote:


> There's still something, that I am philosophycally missing.
> 
> Wy do I have to import the entire tree if I'm just interested in a leave.

You don't. Python just imports the branches leading to the leaf, not the
entire tree.

[...]
> But if I know that I just want to boil some eggs I would really
> appreciate if I could just say
> 
>> from kitchen.pot import boil
>> boil(eggs)
> without having the side effect of getting pans and knives also loaded
> into memory.

In your example, you stated that kitchen explicitly imports kitchen.pans and
kitchen.knives. So in that case, take it up with the designer of the
kitchen package -- it was his decision to import them, just like he
imported re and math and httplib. (For example.) 

If kitchen is your package, then it is your choice: if you want to have
control over when sub-packages get imported, then don't automatically
import them in __init__.py. If you want them to be automatically imported,
like os and os.path, then automatically import them. If you don't, don't.

But note that you cannot expect to import kitchen.pot without importing
kitchen first.


> One package in question is a huge django application.
> 
> Within the package is one module defining some constants and tiny
> functions, which I would like to reuse from some command line tools,
> which should start quickly without loading any of the django specific
> modules. (the startup penalty and the memory overhead would be noticable)
> 
> I am using rpc4django, which expects, that __init__.py of the django
> application exports some all rpc functions
> which will basically import 95% of the django application and the entire
> django frame work (none of which were required by my command tool,
> support utility for this application)
> 
> 
> I could of course create a separate package just for this tiny sub
> module, but somehow it doesn't feel right to me.

Why should it be a package? Just make it a stand-alone module.

Or use path manipulation from your command line tool to import it on its
own. It might be somewhat of a hack, but if need to do it, do so.

Or do something like this:

my_app/
+--  __init__.py  # lightweight, nearly empty
+--  cmd_tools.py
+--  module1.py
+--  module2.py
+--  rpc/
     +-- __init__.py  # huge, imports my_app.module1, my_app.module2, etc.


then point rpc4django at my_app.rpc instead of my_app.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Sun Sep 11 01:00:55 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 15:00:55 +1000
Subject: convert  time
References: <mailman.970.1315716418.27778.python-list@python.org>
Message-ID: <4e6c4088$0$29965$c3e8da3$5496439d@news.astraweb.com>

???? wrote:

> how can i convert "Dec 11" into  2011-12?


if my_str == "Dec 11":
    return 1999  # 2011 - 12


Does that help?

But seriously... 2011-12 is not a proper date, so the simplest way is
probably something like this:

def convert(date_str):
    month, short_year = date_str.split()
    if len(short_year) == 4:
        year = short_year
    else:
        year = '20' + short_year
    months = 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec'.split()
    month = months.index(month) + 1
    return year + '-' + str(month)

Otherwise see the time and datetime modules:

http://docs.python.org/library/time.html
http://docs.python.org/library/datetime.html


-- 
Steven



From clp2 at rebertia.com  Sun Sep 11 01:02:37 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 10 Sep 2011 22:02:37 -0700
Subject: convert time
In-Reply-To: <tencent_3E32FF310B29A4E4732AB698@qq.com>
References: <tencent_3E32FF310B29A4E4732AB698@qq.com>
Message-ID: <CAMZYqRT-vXoY+Mia+kbh7Thg6NRjf-aa3-gdwVqS39cMvXR5aQ@mail.gmail.com>

2011/9/10 ???? <1248283536 at qq.com>:
> how can i convert "Dec 11" into? 2011-12?

Read the fine manuals for the `time` or `datetime` modules.
http://docs.python.org/library/datetime.html

>>> from datetime import datetime
>>> datetime.strptime("Dec 11", "%b %y")
datetime.datetime(2011, 12, 1, 0, 0)
>>> datetime.strptime("Dec 11", "%b %y").strftime("%Y-%m")
'2011-12'

Note that this code depends on an appropriate locale setting for
parsing the month name abbreviations.

Cheers,
Chris
--
http://rebertia.com


From steve+comp.lang.python at pearwood.info  Sun Sep 11 01:08:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 15:08:00 +1000
Subject: killing a script
References: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
	<mailman.928.1315644591.27778.python-list@python.org>
Message-ID: <4e6c4231$0$29996$c3e8da3$5496439d@news.astraweb.com>

Cameron Simpson wrote:

> On 10Sep2011 11:25, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
> | Cameron Simpson wrote:
> | > My copy of the 2.7 docs says:
> | >   This is implemented by calling the Standard C function system(), and
> | >   has the same limitations.
> | > and sure enough, "man 3 system" says:
> | 
> | I don't consider having to look up documentation for a function in a
> | completely different language (in this case, C) as "documented behaviour
> | of os.system".
> 
> You're kidding, surely? 

No, I meant exactly what I said, but I suspect that you misunderstood what I
said. I blame myself for not making myself more clear, sorry.


> A wrapper function for a system supplied function 
> should recite everything about the wrapped function's behaviour (including
> the system dependent stuff) in the wrapper doco?

Heavens no, I certainly don't mean that. That would be silly. 

What I mean is that in the context of discussing Python library
functions, "documented behaviour" refers to what the Python docs state,
namely the function docstring and the docs at http://docs.python.org/ (or
the 3.x version). Third-party documentation doesn't count: not blogs,
not "some guy sent me an email", and not documentation for other tools
either.

So if you describe a feature of os.system as "documented", I'm going to
understand that as *Python* documentation. Hence my question about where it
is documented. If we're discussing external documentation, we should say so
up front: not all Python users are using CPython, and not all Python coders
know C and have access to the Linux man pages.


-- 
Steven



From ben+python at benfinney.id.au  Sun Sep 11 01:20:07 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 11 Sep 2011 15:20:07 +1000
Subject: optionparse: how to add a line break to the help text
References: <j4gi5r$gjc$1@dough.gmane.org>
	<mailman.952.1315693006.27778.python-list@python.org>
	<op.v1mdm0oba8ncjz@gnudebst> <j4h4dh$60n$1@dough.gmane.org>
	<4E6C182D.60905@tim.thechases.com>
	<mailman.964.1315710463.27778.python-list@python.org>
Message-ID: <87aaabmz94.fsf@benfinney.id.au>

Gelonida N <gelonida at gmail.com> writes:

> Considering, that you posted the snippet in 2007 and this is very
> probably a reocurring problem for any slighty more complicated help
> text it is really a pity, that it did not become of part of the
> standard optparse library :-(

The ?optparse? library is, as the online documentation shows
<URL:http://docs.python.org/library/optparse.html>, deprecated for new
code:

    The optparse module is deprecated and will not be developed further;
    development will continue with the argparse module.

The standard library ?argparse? module has a feature you might prefer
<URL:http://docs.python.org/library/argparse.html#formatter-class>.

-- 
 \      ?An expert is a man who has made all the mistakes which can be |
  `\                         made in a very narrow field.? ?Niels Bohr |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Sun Sep 11 01:30:18 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 11 Sep 2011 15:30:18 +1000
Subject: convert  time
References: <mailman.970.1315716418.27778.python-list@python.org>
	<4e6c4088$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <8762kzmys5.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> But seriously... 2011-12 is not a proper date

It's valid by ISO 8601. The standard allows any number of parts to be
dropped, from least to most significant, in order to have a value with
deliberately reduced precision.

   <URL:https://secure.wikimedia.org/wikipedia/en/wiki/ISO_8601#General_principles>

> Otherwise see the time and datetime modules:

    >>> import datetime
    >>> text = "2011-12"
    >>> datetime.datetime.strptime(text, "%Y-%m")
    datetime.datetime(2011, 12, 1, 0, 0)

-- 
 \            ?It's not what you pay a man, but what he costs you that |
  `\                                             counts.? ?Will Rogers |
_o__)                                                                  |
Ben Finney


From dreyemi at gmail.com  Sun Sep 11 04:18:29 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 11 Sep 2011 09:18:29 +0100
Subject: Invoke a superclass method from a subclass constructor
Message-ID: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>

Hello friends,

An instance of my subclass doesn't invoke its superclass method, except when
it is referenced
directly.

Here is what I mean:

>>> class A(object):
...     def log(self, module):
...             return str('logged')
...

>>> class B(A):
...     def __init__(self, module):
...             self.module = A().log(module)
...
>>> c = B('system')
>>> # I expect 'logged' to be printed here
>>> print c.log('system') # why do I have to do this?
>>> 'logged'

Why do I have to make a call to c.log before log() method can be invoked?

My reasoning is such that since I have passed the log() method to B's
constructor, an instance
of B should invoke A's log() method.

What could I be missing in class A or B to have this working as expected?
-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From t at jollybox.de  Sun Sep 11 06:41:08 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sun, 11 Sep 2011 12:41:08 +0200
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
Message-ID: <4E6C9044.5060302@jollybox.de>

On 11/09/11 10:18, Kayode Odeyemi wrote:
> Hello friends,
> 
> An instance of my subclass doesn't invoke its superclass method, except
> when it is referenced
> directly. 
> 
> Here is what I mean:
> 
>>>> class A(object):
> ...     def log(self, module):
> ...             return str('logged')
> ...
> 
>>>> class B(A):
> ...     def __init__(self, module):
> ...             self.module = A().log(module)
> ...
>>>> c = B('system')
>>>> # I expect 'logged' to be printed here
>>>> print c.log('system') # why do I have to do this?
>>>> 'logged'
> 
> Why do I have to make a call to c.log before log() method can be invoked?
> 
> My reasoning is such that since I have passed the log() method to B's
> constructor, an instance
> of B should invoke A's log() method.
> 
> What could I be missing in class A or B to have this working as expected?

It is working:

>>> class A(object):
...     def log (self, module):
...         return str ('logged')
...
>>> class B(A):
...     def __init__(self, module):
...         self.module = A().log(module)
...
>>> c = B('system')
>>> c.module
'logged'

In B's constructor, you create a new instance of A (a pointless
excersise - you already have an instance of A, "self"), call its log()
method, and store the return value of that method in the attribute "module".

This is how you'd usually call a superclass's method:

>>> class B2(A):
...     def __init__(self, module):
...         # This is the way to call a superclass method:
...         self.log (module)
...
>>> c2 = B2 ('system')
>>>

That's what inheritance is. If B is derived from A, any B *is* also an A.

Now, something that might be closer to what you're actually heading for,
to think about. Please note that I'm using Python 3: explicitly deriving
a class from object is no longer necessary, and the "super" function is
now simpler. If you want to use Python 2, I'll leave looking up how to
use its "super" function as an excersise to the reader.

>>> class ModuleLogger:
...     def __init__(self, module):
...         self.module = module
...         print ('module logged: {0}'.format (module))
...
>>> class Foo (ModuleLogger):
...     def __init__(self, module):
...         # calling a superclass constructor here, in Python 3 syntax:
...         super().__init__(module)
...
>>> f = Foo ('system')
module logged: system
>>>

Using super() is always necessary when calling a superclass' method that
is also implemented in the subclass - self.__init__ would just invoke
the Foo constructor, you need super() to get to the ModuleLogger
constructor.

 - Thomas


From python.list at tim.thechases.com  Sun Sep 11 07:05:56 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 11 Sep 2011 06:05:56 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <j4h8lh$qui$1@dough.gmane.org>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>	<j4h4dh$60n$1@dough.gmane.org>	<4E6C182D.60905@tim.thechases.com>
	<j4h8lh$qui$1@dough.gmane.org>
Message-ID: <4E6C9614.60406@tim.thechases.com>

On 09/10/11 22:07, Gelonida N wrote:
>> http://bytes.com/topic/python/answers/734066-how-output-newline-carriage-return-optparse
>
> It works (of course ;-) ) like a charm. Good to know, that I'm
> not the only one who want's to structure the help text a
> little nicer.
>
> Considering, that you posted the snippet in 2007 and this is
> very probably a reocurring problem for any slighty more
> complicated help text it is really a pity, that it did not
> become of part of the standard optparse library :-(

Even at the time, the optparse library wasn't readily patchable 
as the inline documentation gave some dire warning about "don't 
edit this directly, as this file is generated from some other 
source"?I never was able to dig up that source to patch against.

As Ben Finney replied, optparse is now deprecated, replaced in 
part by argparse. Unfortunately, argparse wasn't backported to 
the standard library for earlier 2.x series (I think it became 
available in 2.7, and may run in earlier versions if manually 
added like I had to do on my Debian Py2.6 install). But that 
makes it hard for those of us who want to use a built-in 
option-parsing library across a wide variety of Python versions. 
  I don't strongly care which I use except that I want it to be 
broadly available with minimal fuss.

-tkc




From dreyemi at gmail.com  Sun Sep 11 07:17:27 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 11 Sep 2011 12:17:27 +0100
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <4E6C9044.5060302@jollybox.de>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
Message-ID: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>

On Sun, Sep 11, 2011 at 11:41 AM, Thomas Jollans <t at jollybox.de> wrote:

> On 11/09/11 10:18, Kayode Odeyemi wrote:
> > Hello friends,
> >
> > An instance of my subclass doesn't invoke its superclass method, except
> > when it is referenced
> > directly.
> >
> > Here is what I mean:
> >
> >>>> class A(object):
> > ...     def log(self, module):
> > ...             return str('logged')
> > ...
> >
> >>>> class B(A):
> > ...     def __init__(self, module):
> > ...             self.module = A().log(module)
> > ...
> >>>> c = B('system')
> >>>> # I expect 'logged' to be printed here
> >>>> print c.log('system') # why do I have to do this?
> >>>> 'logged'
> >
> > Why do I have to make a call to c.log before log() method can be invoked?
> >
> > My reasoning is such that since I have passed the log() method to B's
> > constructor, an instance
> > of B should invoke A's log() method.
> >
> > What could I be missing in class A or B to have this working as expected?
>
> It is working:
>
> >>> class A(object):
> ...     def log (self, module):
> ...         return str ('logged')
> ...
> >>> class B(A):
> ...     def __init__(self, module):
> ...         self.module = A().log(module)
> ...
> >>> c = B('system')
> >>> c.module
> 'logged'
>
> Why do you have to do c.module? I'm expecting an output just by creating an
instance of B.
Could this be a limitation in Py2+?


> In B's constructor, you create a new instance of A (a pointless
> excersise - you already have an instance of A, "self"), call its log()
> method, and store the return value of that method in the attribute
> "module".
>
> This is how you'd usually call a superclass's method:
>
> >>> class B2(A):
> ...     def __init__(self, module):
> ...         # This is the way to call a superclass method:
> ...         self.log (module)
> ...
> >>> c2 = B2 ('system')
> >>>
>
> That's what inheritance is. If B is derived from A, any B *is* also an A.
>
> Now, something that might be closer to what you're actually heading for,
> to think about. Please note that I'm using Python 3: explicitly deriving
> a class from object is no longer necessary, and the "super" function is
> now simpler. If you want to use Python 2, I'll leave looking up how to
> use its "super" function as an excersise to the reader.
>
> >>> class ModuleLogger:
> ...     def __init__(self, module):
> ...         self.module = module
> ...         print ('module logged: {0}'.format (module))
> ...
> >>> class Foo (ModuleLogger):
> ...     def __init__(self, module):
> ...         # calling a superclass constructor here, in Python 3 syntax:
> ...         super().__init__(module)
> ...
> >>> f = Foo ('system')
> module logged: system
> >>>
>
> I'm on Py2.7.

class ModuleLogger is not the same as class A (the one I'm using as an
example). I need the log()
method to be an instance of class A. I don't want it declared in class A
constructor because I don't
want to have access to it when class A is instantiated.

Using super() is always necessary when calling a superclass' method that
> is also implemented in the subclass - self.__init__ would just invoke
> the Foo constructor, you need super() to get to the ModuleLogger
> constructor.
>

Well, I did try using super(), but I got this:
>>> class B(A):
...     def __init__(self, module):
...             super(A, self).log('system')
...
>>> c = B('module')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __init__
AttributeError: 'super' object has no attribute 'log'

I hope a reader on Py2+ can help with this.

>
>  - Thomas
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From kushal.kumaran+python at gmail.com  Sun Sep 11 07:32:18 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Sun, 11 Sep 2011 17:02:18 +0530
Subject: Deadlock problem using multiprocessing
In-Reply-To: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>
References: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>
Message-ID: <CAH8GtdPAxbXGLdpbP+fXm+CvmkpmWVmxSHCvrCdi+Sn0J4O96g@mail.gmail.com>

2011/9/11 ???? <bluegene8210 at gmail.com>:
> This is my first touch on the multiprocessing module, and I admit not
> having a deep understanding of parallel programming, forgive me if
> there's any obvious error. This is my test code:
>
> # deadlock.py
>
> import multiprocessing
>
> class MPTask:
> ? ? ? ?def __init__(self):
> ? ? ? ? ? ? ? ?self._tseq= range(10) ? # task sequence
> ? ? ? ? ? ? ? ?self._pool= multiprocessing.Pool(2) ? ? # process pool
> ? ? ? ?def _exe(self, num):
> ? ? ? ? ? ? ? ?return num**2
> ? ? ? ?def run(self):
> ? ? ? ? ? ? ? ?result= self._pool.map_async(self._exe, self._tseq)
> ? ? ? ? ? ? ? ?return result.get()
>
> result= MPTask().run()
> print(result)
>
> And seemingly it creates a deadlock, I have to manually kill the
> processes in the system monitor, yet it would be OK if the _exe()
> function was defined outside the MPTask class:
>
> # no_deadlock.py
> import multiprocessing
>
> def _exe(num):
> ? ? ? ?return num**2
>
> class MPTask:
> ? ? ? ?def __init__(self):
> ? ? ? ? ? ? ? ?self._tseq= range(10) ? # task sequence
> ? ? ? ? ? ? ? ?self._pool= multiprocessing.Pool(2) ? ? # process pool
> ? ? ? ?def run(self):
> ? ? ? ? ? ? ? ?result= self._pool.map_async(_exe, self._tseq)
> ? ? ? ? ? ? ? ?return result.get()
>
> result= MPTask().run()
> print(result)
>
> This would give the correct answer without any deadlock. My questions:
>
> 1. Why is this, where did the deadlock come from?
>
> 2. Besides, is there any material I can refer to about how to avoid
> deadlocks when using multiple processes in the program?
>

I get this exception when I run the first program:

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.1/threading.py", line 469, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.1/multiprocessing/pool.py", line 231, in _handle_tasks
    put(task)
  File "/usr/lib/python3.1/pickle.py", line 1349, in dumps
    Pickler(f, protocol, fix_imports=fix_imports).dump(obj)
_pickle.PicklingError: Can't pickle <class 'method'>: attribute lookup
builtins.method failed

There is no deadlock.  You are hitting this problem:
http://stackoverflow.com/questions/1816958/cant-pickle-type-instancemethod-when-using-pythons-multiprocessing-pool-map

-- 
regards,
kushal


From t at jollybox.de  Sun Sep 11 07:32:52 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sun, 11 Sep 2011 13:32:52 +0200
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
Message-ID: <4E6C9C64.3030704@jollybox.de>

On 11/09/11 13:17, Kayode Odeyemi wrote:
> On Sun, Sep 11, 2011 at 11:41 AM, Thomas Jollans <t at jollybox.de
> <mailto:t at jollybox.de>> wrote:
> 
>     It is working:
> 
>     >>> class A(object):
>     ...     def log (self, module):
>     ...         return str ('logged')
>     ...
>     >>> class B(A):
>     ...     def __init__(self, module):
>     ...         self.module = A().log(module)
>     ...
>     >>> c = B('system')
>     >>> c.module
>     'logged'
> 
> Why do you have to do c.module? I'm expecting an output just by creating
> an instance of B.
> Could this be a limitation in Py2+?
>  

I believe I already answered that question. You quoted my answer
directly below your question:

> 
>     In B's constructor, you create a new instance of A (a pointless
>     excersise - you already have an instance of A, "self"), call its log()
>     method, and store the return value of that method in the attribute
>     "module".
> 
>     This is how you'd usually call a superclass's method:
> 
>     >>> class B2(A):
>     ...     def __init__(self, module):
>     ...         # This is the way to call a superclass method:
>     ...         self.log (module)
>     ...
>     >>> c2 = B2 ('system')
>     >>>
> 
>     That's what inheritance is. If B is derived from A, any B *is* also
>     an A.
> 
>     Now, something that might be closer to what you're actually heading for,
>     to think about. Please note that I'm using Python 3: explicitly deriving
>     a class from object is no longer necessary, and the "super" function is
>     now simpler. If you want to use Python 2, I'll leave looking up how to
>     use its "super" function as an excersise to the reader.
> 
>     >>> class ModuleLogger:
>     ...     def __init__(self, module):
>     ...         self.module = module
>     ...         print ('module logged: {0}'.format (module))
>     ...
>     >>> class Foo (ModuleLogger):
>     ...     def __init__(self, module):
>     ...         # calling a superclass constructor here, in Python 3 syntax:
>     ...         super().__init__(module)
>     ...
>     >>> f = Foo ('system')
>     module logged: system
>     >>>
> 
> I'm on Py2.7.
> 
> class ModuleLogger is not the same as class A (the one I'm using as an
> example). I need the log()
> method to be an instance of class A. I don't want it declared in class A
> constructor because I don't
> want to have access to it when class A is instantiated.

Then do it differently. I was merely offering an example that I hoped
might help you acheive your goals.

> 
>     Using super() is always necessary when calling a superclass' method that
>     is also implemented in the subclass - self.__init__ would just invoke
>     the Foo constructor, you need super() to get to the ModuleLogger
>     constructor.
> 
> 
> Well, I did try using super(), but I got this: 
>>>> class B(A):
> ...     def __init__(self, module):
> ...             super(A, self).log('system')
> ...
>>>> c = B('module')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 3, in __init__
> AttributeError: 'super' object has no attribute 'log'
> 
> I hope a reader on Py2+ can help with this.

If you'd read my previous response carefully, you'd know that in this
case, you don't need super(), and you'd also know how to use the
superclass' method.




From laddosingh at gmail.com  Sun Sep 11 07:46:38 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 04:46:38 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.943.1315677614.27778.python-list@python.org>
Message-ID: <fceb391d-8ac5-4eef-b89e-72c7327fc266@o26g2000vbi.googlegroups.com>

On 10 Sep, 19:59, Terry Reedy <tjre... at udel.edu> wrote:
> On 9/10/2011 7:20 AM, Tigerstyle wrote:
>
> > Hi guys.
>
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> We appreciate you saying so instead of hiding that this is homework.
>
>
>
>
>
>
>
>
>
> > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>
> > def book_title(title):
> > ? ? ?""" Takes a string and returns a title-case string.
> > ? ? ?All words EXCEPT for small words are made title case
> > ? ? ?unless the string starts with a preposition, in which
> > ? ? ?case the word is correctly capitalized.
> > ? ? ?>>> ?book_title('DIVE Into python')
> > ? ? ?'Dive into Python'
> > ? ? ?>>> ?book_title('the great gatsby')
> > ? ? ?'The Great Gatsby'
> > ? ? ?>>> ?book_title('the WORKS OF AleXANDer dumas')
> > ? ? ?'The Works of Alexander Dumas'
> > ? ? ?"""
> > ? ? ?new_title = []
> > ? ? ?title_split = title.strip().lower().split()
> > ? ? ?for word in title_split:
> > ? ? ? ? ?if title_split[0] in small_words:
> > ? ? ? ? ? ? ?new_title.append(word.title())
> > ? ? ? ? ?elif word in small_words:
> > ? ? ? ? ? ? ?new_title.append(word.lower())
> > ? ? ? ? ?else:
> > ? ? ? ? ? ? ?new_title.append(word.title())
>
> The key issue is that you want to treat the first word one way (.title
> it) and the rest differently (conditionally .title or not) . So
> immediately separate the first from the rest and then process each.
> There are at least three ways to do the split. Perhaps I should stop
> with this hint, and certainly you should think a bit before reading
> further, but here is what I consider to be the most elegant 3.2 code.
> .
> ,
> ,
> ,
> .
> .
> .
> ? ? ?first, *rest = title.strip().lower().split()
> ? ? ?new_title = [first.title()]
> ? ? ?for word in rest:
> ? ? ? ? ?if word not in small_words:
> ? ? ? ? ? ? ?word = word.title()
> ? ? ? ? ?new_title.append(word)
>
> > ? ? ?return(' '.join(new_title))
>
> doctest.testmod() now passes (there is no 'refactory' here)
>
> > def _test():
> > ? ? ?import doctest, refactory
> > ? ? ?return doctest.testmod(refactory)
> > if __name__ == "__main__":
> > ? ? ?_test()
>
> --
> Terry Jan Reedy

Thank you Terry,

I went for this solution as it was the easiest for me to understand
and comment myself keeping in mind what level I am at right now.
Thanks a ton to everyone for sharing so much information and making it
easy to read and understand your thoughts. This was surely very very
educating read the replies from so many talented people.

Thanks and looking forward to hanging around here more :)

T


From davea at ieee.org  Sun Sep 11 07:55:31 2011
From: davea at ieee.org (Dave Angel)
Date: Sun, 11 Sep 2011 07:55:31 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
Message-ID: <4E6CA1B3.2060503@ieee.org>

On 01/-10/-28163 02:59 PM, Kayode Odeyemi wrote:
> Hello friends,
>
> An instance of my subclass doesn't invoke its superclass method, except when
> it is referenced
> directly.
>
> Here is what I mean:
>
>>>> class A(object):
> ...     def log(self, module):
> ...             return str('logged')
> ...
>
>>>> class B(A):
> ...     def __init__(self, module):
> ...             self.module = A().log(module)
> ...
>>>> c = B('system')
>>>> # I expect 'logged' to be printed here
>>>> print c.log('system') # why do I have to do this?
>>>> 'logged'
> Why do I have to make a call to c.log before log() method can be invoked?
>
> My reasoning is such that since I have passed the log() method to B's
> constructor, an instance
> of B should invoke A's log() method.
>
> What could I be missing in class A or B to have this working as expected?
What makes you think that A.log() was not invoked???

You have no print statement, so you can't tell that way.  All the method 
does is to modify a temporary object of type A, so you can't tell that way.

Perhaps you mean to write
       self.module = A.log(self, module)

So that the return value could do some good.

DaveA



From python.list at tim.thechases.com  Sun Sep 11 08:41:58 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 11 Sep 2011 07:41:58 -0500
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4gea4$m3b$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
Message-ID: <4E6CAC96.9000304@tim.thechases.com>

On 09/10/11 14:36, Terry Reedy wrote:
> 1. Process first item of an iterable separately.
>
> A traditional solution is a flag variable that is tested for each item.
>
> first = True
> <other setup>
> for item in iterable:
>     if first:
>       <process first>
>       first = False
>     else:
>       <process non-first>
>
> (I have seen code like this posted on this list several times, including
> today.)
>
> Better, to me, is to remove the first item *before* the loop.
>
> items = iter(iterable)
> <set up with next(items)
> for item in items:
>     <process non-first>

I like to use this one for processing CSV files where I need to 
clean up the headers:

   r = csv.reader(f)
   headers = r.next()
   header_map = dict(
     (header.strip().upper(), i)
     for i, header
     in enumerate(headers)
     )
   for row in r:
     item = lambda s: row[header_map[s]].strip()
     thing = item("THING")
     whatever = item("WHATEVER")

It's mostly like a DictReader, but it isn't as sensitive to the 
spaces/capitalization that clients love to mess with.

-tkc





From __peter__ at web.de  Sun Sep 11 08:48:41 2011
From: __peter__ at web.de (Peter Otten)
Date: Sun, 11 Sep 2011 14:48:41 +0200
Subject: recursive algorithm for balls in numbered boxes
References: <32440187.post@talk.nabble.com>
Message-ID: <j4iamn$ave$1@dough.gmane.org>

Dr. Phillip M. Feldman wrote:

> I've written a recursive class that creates an iterator to solve a general
> formulation of the combinatorics problem known as "balls in numbered
> boxes"
> (also known as "indistinguishable balls in distinguishable boxes").  The
> code has been extensively tested and appears to work, but isn't terribly
> elegant.  Any suggestions about how to improve it will be appreciated.
 

Does the following do what you want?

>>> from itertools import product
>>> def binb(balls, boxsizes):
...     return (fill for fill in product(*[range(bs+1) for bs in boxsizes]) 
if sum(fill) == balls)
...
>>> for item in binb(10, [4, 3, 2, 1, 2]):
...     print item
...
(2, 3, 2, 1, 2)
(3, 2, 2, 1, 2)
(3, 3, 1, 1, 2)
(3, 3, 2, 0, 2)
(3, 3, 2, 1, 1)
(4, 1, 2, 1, 2)
(4, 2, 1, 1, 2)
(4, 2, 2, 0, 2)
(4, 2, 2, 1, 1)
(4, 3, 0, 1, 2)
(4, 3, 1, 0, 2)
(4, 3, 1, 1, 1)
(4, 3, 2, 0, 1)
(4, 3, 2, 1, 0)

If so, your implementation misses a few configurations:

>>> from balls_in_numbered_boxes import balls_in_numbered_boxes as bb
>>> for item in bb(10, [4, 3, 2, 1, 2]):
...     print item
...
[4 3 2 1 0]
[3 3 2 1 1]
[2 3 2 1 2]

> Also, I'd like to get this functionality into the Python's `itertools`
> module (the present set of combinatorics functions in `itertools` does not
> include "balls in boxes").  Does anyone know whom I should contact about
> this?

Basically you have to convince Raymond Hettinger. I recommend that you post 
your suggestion on python-ideas for a general discussion rather than 
approaching him directly.




From __peter__ at web.de  Sun Sep 11 09:41:23 2011
From: __peter__ at web.de (Peter Otten)
Date: Sun, 11 Sep 2011 15:41:23 +0200
Subject: Idioms combining 'next(items)' and 'for item in items:'
References: <j4gea4$m3b$1@dough.gmane.org>
Message-ID: <j4idpg$t29$1@dough.gmane.org>

Terry Reedy wrote:

> 3. Process the items of an iterable in pairs.
> 
> items = iter(iterable)
> for first in items:
>      second = next(items)
>      <process first and second>
> 
> This time, StopIteration is raised for an odd number of items. Catch and 
> process as desired. One possibility is to raise ValueError("Iterable 
> must have an even number of items").
 
Another way is zip-based iteration:

(a) silently drop the odd item

items = iter(iterable)
for first, second in zip(items, items): # itertools.izip in 2.x
   ...

(b) add a fill value

for first, second in itertools.zip_longest(items, items):
    ...

(c) raise an exception

Unfortunately there is no zip_exc() that guarantees that all iterables are 
of the same "length", but I've written a recipe some time ago

http://code.activestate.com/recipes/497006-zip_exc-a-lazy-zip-that-ensures-
that-all-iterables/

that achieves near-C speed.



From gelonida at gmail.com  Sun Sep 11 10:17:56 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 16:17:56 +0200
Subject: import packet.module without importing packet.__init__ ?
In-Reply-To: <4e6c3e47$0$29999$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.958.1315699526.27778.python-list@python.org>	<4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>	<mailman.967.1315712363.27778.python-list@python.org>
	<4e6c3e47$0$29999$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4ifuk$aci$1@dough.gmane.org>

Hi Steven,

Thanks again for your answer.


On 09/11/2011 06:51 AM, Steven D'Aprano wrote:
> Gelonida N wrote:

> 
> In your example, you stated that kitchen explicitly imports kitchen.pans and
> kitchen.knives. So in that case, take it up with the designer of the
> kitchen package -- it was his decision to import them, just like he
> imported re and math and httplib. (For example.) 

Exactly. Thus my conclusion, that too many imports (just for commodity)
in __init__.py might not be such a good idea if one wants to allow
leaf-only imports.
> 
> If kitchen is your package, then it is your choice: if you want to have
> control over when sub-packages get imported, then don't automatically
> import them in __init__.py. 

Agreed. This is however my problem: Up to my understanding rpc4django
insists on putting code into __init__.py

> 
> 
>> One package in question is a huge django application.
>>
>> Within the package is one module defining some constants and tiny
>> functions, which I would like to reuse from some command line tools,
>> which should start quickly without loading any of the django specific
>> modules. (the startup penalty and the memory overhead would be noticable)
>>
>> I am using rpc4django, which expects, that __init__.py of the django
>> application exports some all rpc functions
>> which will basically import 95% of the django application and the entire
>> django frame work (none of which were required by my command tool,
>> support utility for this application)
>>
>>
>> I could of course create a separate package just for this tiny sub
>> module, but somehow it doesn't feel right to me.
> 
> Why should it be a package? Just make it a stand-alone module.

True

> Or do something like this:
> 
> my_app/
> +--  __init__.py  # lightweight, nearly empty
> +--  cmd_tools.py
> +--  module1.py
> +--  module2.py
> +--  rpc/
>      +-- __init__.py  # huge, imports my_app.module1, my_app.module2, etc.
> 
> then point rpc4django at my_app.rpc instead of my_app.
> 

Up to my knowledge rpc4django just imports all __inits__ of all django
applications to find look for functions with a certain decorator.

I'm not sure, whether django allows nested appllications, but this might
be a solution.




From gelonida at gmail.com  Sun Sep 11 10:30:07 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 16:30:07 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <87aaabmz94.fsf@benfinney.id.au>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>
	<j4h4dh$60n$1@dough.gmane.org>	<4E6C182D.60905@tim.thechases.com>	<mailman.964.1315710463.27778.python-list@python.org>
	<87aaabmz94.fsf@benfinney.id.au>
Message-ID: <j4iglg$e9f$1@dough.gmane.org>

Thanks Ben,

On 09/11/2011 07:20 AM, Ben Finney wrote:
> Gelonida N <gelonida at gmail.com> writes:
> 
>> Considering, that you posted the snippet in 2007 and this is very
>> probably a reocurring problem for any slighty more complicated help
>> text it is really a pity, that it did not become of part of the
>> standard optparse library :-(
> 
> The ?optparse? library is, as the online documentation shows
> <URL:http://docs.python.org/library/optparse.html>, deprecated for new
> code:
> 
>     The optparse module is deprecated and will not be developed further;
>     development will continue with the argparse module.

This explains the reluctance to fix optparse. In 2007 however python 2.7
wasn't really that common though
> 
> The standard library ?argparse? module has a feature you might prefer
> <URL:http://docs.python.org/library/argparse.html#formatter-class>.

Most of my code has to run on python 2.5 / 2.6.

I just checked, that argparse can be installed (pip install argparse)
(didn't check functionality though) for python 2.5 / 2.6

So depending on the situation I had to decide whether I oblige users of
my scripts to  install argparse or whether I stick with optparse and
just add Tim's custom formatter.

Probably I'll go for optparse and Tim's custom formatter for tiny
scripts with no dependencies except standard libraries and
for  argparse for new bigger projects with external module dependencies.








From mdickinson at enthought.com  Sun Sep 11 11:08:17 2011
From: mdickinson at enthought.com (Mark Dickinson)
Date: Sun, 11 Sep 2011 08:08:17 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
References: <mailman.959.1315701829.27778.python-list@python.org>
Message-ID: <a3b7c177-944c-4d86-9329-0a88fd410c67@y21g2000yqk.googlegroups.com>

On Sep 11, 1:43?am, "Dr. Phillip M. Feldman"
<Phillip.M.Feld... at gmail.com> wrote:
> I've written a recursive class that creates an iterator to solve a general
> formulation of the combinatorics problem known as "balls in numbered boxes"
> (also known as "indistinguishable balls in distinguishable boxes"). ?The
> code has been extensively tested and appears to work, but isn't terribly
> elegant. ?Any suggestions about how to improve it will be appreciated.
>
> Also, I'd like to get this functionality into the Python's `itertools`
> module (the present set of combinatorics functions in `itertools` does not
> include "balls in boxes"). ?Does anyone know whom I should contact about
> this?

Note that for the version without size limits on individual boxes, the
itertools.combination function already provides most of what's
needed.  For example:

    import itertools

    def balls_in_boxes(nballs, nboxes):
        n, k = nballs + nboxes - 1, nboxes - 1
        for comb in itertools.combinations(range(n), k):
            yield [y - x - 1 for y, x in zip(comb + (n,), (-1,) +
comb)]

    print "5 balls in 3 boxes"
    for combination in balls_in_boxes(5, 3):
        print combination
        assert len(combination) == 3
        assert sum(combination) == 5


This is a well-known trick:  to divide 5 (unlabeled) balls amongst 3
(labeled) boxes, you write down sequences of 5 o's and 2 x's, where
the o's represent the 5 balls and the 'x's represent dividers:

    ooxooxo  -> [2, 2, 1]
    xoooxoo  -> [0, 3, 2]

And 'combinations(7, 2)' yields successively all the possible
different placements for the 2 dividers in the 7 symbols.


This question seems to come up often enough (without the box size
limit twist) that maybe it would be useful to include something like
this recipe in the itertool documentation.


For getting this into itertools, I'd suggest opening a feature request
on bugs.python.org and assigning it to Raymond Hettinger.

--
Mark


From bluegene8210 at gmail.com  Sun Sep 11 11:46:40 2011
From: bluegene8210 at gmail.com (Jacky Liu)
Date: Sun, 11 Sep 2011 08:46:40 -0700 (PDT)
Subject: Deadlock problem using multiprocessing
References: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>
	<mailman.981.1315740760.27778.python-list@python.org>
Message-ID: <b40429ce-3632-4540-aa29-79b99c41aa27@a10g2000prn.googlegroups.com>

>
> I get this exception when I run the first program:
>
> Exception in thread Thread-1:
> Traceback (most recent call last):
> ? File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
> ? ? self.run()
> ? File "/usr/lib/python3.1/threading.py", line 469, in run
> ? ? self._target(*self._args, **self._kwargs)
> ? File "/usr/lib/python3.1/multiprocessing/pool.py", line 231, in _handle_tasks
> ? ? put(task)
> ? File "/usr/lib/python3.1/pickle.py", line 1349, in dumps
> ? ? Pickler(f, protocol, fix_imports=fix_imports).dump(obj)
> _pickle.PicklingError: Can't pickle <class 'method'>: attribute lookup
> builtins.method failed
>
> There is no deadlock. ?You are hitting this problem:http://stackoverflow.com/questions/1816958/cant-pickle-type-instancem...
>
> --
> regards,
> kushal


You're right. I just realized that I was running the program through
my Vim plug-in which would use the subprocess module to open the
process, wait for its termination and get the output. It seems that
multi-process program would act quite differently such that my Vim
plug-in had been halted without getting any error information, so I
was to falsely take it as a deadlock.

The thread in stackoverflow you referenced is great, now I'm trying to
fit the solution in my own program, thanks a lot!


From laddosingh at gmail.com  Sun Sep 11 12:36:25 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:36:25 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4fihi$5ao$1@speranza.aioe.org>
Message-ID: <e86efe59-25ee-48d4-a201-4a67053a51c2@bl1g2000vbb.googlegroups.com>

On 10 Sep, 13:43, Mel <mwil... at the-wire.com> wrote:
> Tigerstyle wrote:
> > Hi guys.
>
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> > This is the code:
>
> > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>
> > def book_title(title):
> > ? ? """ Takes a string and returns a title-case string.
> > ? ? All words EXCEPT for small words are made title case
> > ? ? unless the string starts with a preposition, in which
> > ? ? case the word is correctly capitalized.
> > ? ? >>> book_title('DIVE Into python')
> > ? ? 'Dive into Python'
> > ? ? >>> book_title('the great gatsby')
> > ? ? 'The Great Gatsby'
> > ? ? >>> book_title('the WORKS OF AleXANDer dumas')
> > ? ? 'The Works of Alexander Dumas'
> > ? ? """
> > ? ? new_title = []
> > ? ? title_split = title.strip().lower().split()
> > ? ? for word in title_split:
> > ? ? ? ? if title_split[0] in small_words:
> > ? ? ? ? ? ? new_title.append(word.title())
> > ? ? ? ? elif word in small_words:
> > ? ? ? ? ? ? new_title.append(word.lower())
> > ? ? ? ? else:
> > ? ? ? ? ? ? new_title.append(word.title())
> > ? ? return(' '.join(new_title))
>
> > def _test():
> > ? ? import doctest, refactory
> > ? ? return doctest.testmod(refactory)
> > if __name__ == "__main__":
> > ? ? _test()
>
> > All tests are failing even though I am getting the correct output on
> > the first two tests. And the last test still gives me "Of" instead of
> > "of"
>
> > Any help is appreciated.
>
> I don't know about doctest -- I suspect it wants a structured docstring to
> specify the tests -- but this
>
> ? ? ? ? if title_split[0] in small_words:
> ? ? ? ? ? ? new_title.append(word.title())
>
> can't be what you want.
>
> ? ? ? ? Mel.

Agreed. Not what I need.


From laddosingh at gmail.com  Sun Sep 11 12:39:12 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:39:12 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.934.1315655395.27778.python-list@python.org>
Message-ID: <d8154628-4307-4ec9-b3ee-cb9767b1355a@o9g2000vbo.googlegroups.com>

On 10 Sep, 13:50, Thomas Jollans <t... at jollybox.de> wrote:
> On 10/09/11 13:20, Tigerstyle wrote:
>
> > Hi guys.
>
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> > All tests are failing even though I am getting the correct output on
> > the first two tests. And the last test still gives me "Of" instead of
> > "of"
>
> Cannot reproduce. I only get the one, expected, failure.
>
> % python -m doctest books.py
> **********************************************************************
> File "books.py", line 12, in books.book_title
> Failed example:
> ? ? book_title('the WORKS OF AleXANDer dumas')
> Expected:
> ? ? 'The Works of Alexander Dumas'
> Got:
> ? ? 'The Works Of Alexander Dumas'
> **********************************************************************
> 1 items had failures:
> ? ?1 of ? 3 in books.book_title
> ***Test Failed*** 1 failures.
>
>
>
> > def _test():
> > ? ? import doctest, refactory
> > ? ? return doctest.testmod(refactory)
> > if __name__ == "__main__":
> > ? ? _test()
>
> What is this "refactory"? Are you testing the right code? What is the
> output of your test - does it make sense for the module?
>
> Thomas

Still struggling with my test failing. All 3 tests fail. I'm using
Ecplipse and I think Eclipse is what causing this.


From laddosingh at gmail.com  Sun Sep 11 12:40:26 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:40:26 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<mailman.940.1315670200.27778.python-list@python.org>
Message-ID: <bf53d530-0d06-4de3-8c14-7d70ff6428ed@b20g2000vbz.googlegroups.com>

On 10 Sep, 17:56, Chris Angelico <ros... at gmail.com> wrote:
> On Sat, Sep 10, 2011 at 10:24 PM, Alister Ware
>
> <alister.w... at ntlworld.com> wrote:
> > Ignoring the docttests my process would be to process each word & then
> > manually capitalize he 1st word, .I would als0 use a comprehension as
> > makes for cleaner code:-
>
> > def capitalize(word):
> > ? ?if word in small_words:
> > ? ? ? ?return word
> > ? ?else:
> > ? ? ? ?return word.title()
>
> And I'd do this with a lambda, but that's just me. Of course, if your
> logic is more complicated, it makes more sense to keep it in a named
> function, but a single conditional call can fit nicely into a lambda.
>
> ChrisA

Lambda is too complicated for me to understand yet. Will get there
after a little while. Where would you put this piece of code?


From laddosingh at gmail.com  Sun Sep 11 12:42:28 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:42:28 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.933.1315655225.27778.python-list@python.org>
	<bc13c81c-11f3-485b-ae17-f31ed6828be3@et6g2000vbb.googlegroups.com>
Message-ID: <8fc2dea1-a5ef-4d7f-a0f2-e0be56e21e22@h7g2000yqm.googlegroups.com>

On 11 Sep, 04:12, t... at thsu.org wrote:
> On Sep 10, 7:47?am, Peter Otten <__pete... at web.de> wrote:
>
>
>
>
>
>
>
>
>
> > Tigerstyle wrote:
> > > I'm strugglin with some homework stuff and am hoping you can help me
> > > out here.
>
> > > This is the code:
>
> > > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> > > ? ? new_title = []
> > > ? ? title_split = title.strip().lower().split()
> > > ? ? for word in title_split:
> > > ? ? ? ? if title_split[0] in small_words:
> > > ? ? ? ? ? ? new_title.append(word.title())
> > > ? ? ? ? elif word in small_words:
> > > ? ? ? ? ? ? new_title.append(word.lower())
> > > ? ? ? ? else:
> > > ? ? ? ? ? ? new_title.append(word.title())
>
> > The logic of the for-loop is flawed; the expression
>
> > title_split[0] in small_words
>
> > will always evaluate to True if the first word is a "small word", even when
> > the loop is already past the first word. You can work around that with a
> > flag along these lines
>
> > first = True
> > for word in title_split:
> > ? ? if first:
> > ? ? ? ? # special treatment for the first word
> > ? ? ? ? first = False
> > ? ? else:
> > ? ? ? ? # put checks for all words but the first here
> > ? ? new_title.append(fixed_word) # assuming you have stored the titlecased
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# or lowercased word in the fixed_word
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# variable
>
> Another way to tackle this is to just capitalize the entire sentence
> before returning it.
>
> new_title = []
> title_split = title.strip().lower().split()
> for word in title_split:
> ? if word in small_words:
> ? ? new_title.append(word.lower())
> ? else:
> ? ? new_title.append(word.title())
> return(''.join(new_title).capitalize())
>
> However, I'm only helping with your homework, because I want to point
> out that doctest comments should be *readable*. Don't just throw them
> in, take the extra 10-15 seconds to make them easier on the eyes. In
> the workplace, months will pass before you review this code again, so
> you want to make it easier for an older version of yourself to
> remember it.
>
> And it takes very little effort to make it readable. Here's your
> doctest string, reformatted with just a tiny bit more whitespace. I
> even cut out a sentence.
>
> def book_title(title):
> ? """
> ? All words EXCEPT for small words are made title case
> ? unless the string starts with a preposition, in which
> ? case the word is correctly capitalized.
>
> ? >>> book_title('DIVE Into python')
> ? 'Dive into Python'
> ? >>> book_title('the great gatsby')
> ? 'The Great Gatsby'
> ? >>> book_title('the WORKS OF AleXANDer dumas')
> ? 'The Works of Alexander Dumas'
> ? """
> --
> // T.Hsu

It capitalises the phrase, but still the rest of the phrase is in
lower case.


From laddosingh at gmail.com  Sun Sep 11 12:43:31 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:43:31 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4grlj$dg2$1@dough.gmane.org>
	<mailman.972.1315721914.27778.python-list@python.org>
Message-ID: <208f1e6b-66ca-4988-a41a-d83924cb8593@m18g2000vbe.googlegroups.com>

On 11 Sep, 08:18, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Sat, 10 Sep 2011 16:25:42 -0700, Dennis Lee Bieber
> <wlfr... at ix.netcom.com> declaimed the following in
> gmane.comp.python.general:
>
>
>
> > in the language documentation... It will give you a simple way to know
> > if you are looking at the first word. Basically, you want to title-case
> > the word IF it is the first word OR the word is NOT in the list of
> > lowercase words; anything else goes through as lower case...
>
> ? ? ? ? Of course, most of this can be done in a single line (including
> taking into account that some words may have a punctuation mark which
> would confuse the original).
>
> >>> smalls = ['into', 'the', 'a', 'of', 'at', 'in', 'for', 'on' ]
> >>> punct = ".,;:?!;'\"(){}[]"
> >>> def recase(str = "physicist odd-affection, or how i was taught to stop fretting and adore the weapon of mass destruction"):
>
> ... ? ? return " ".join( w.title() if i == 0 or w.strip(punct) not in
> smalls else w
> ... ? ? ? ? ? ? ? ? ? ? for i,w in enumerate(str.lower().strip().split()) )
> ...>>> recase()
>
> 'Physicist Odd-Affection, Or How I Was Taught To Stop Fretting And Adore
> the Weapon of Mass Destruction'>>> recase("what? me worry?")
> 'What? Me Worry?'
> >>> recase("the end of the matter is, to be blunt, a confusion")
>
> 'The End of the Matter Is, To Be Blunt, a Confusion'>>> recase("the end of the matter is in, to be blunt, a confusion")
>
> 'The End of the Matter Is in, To Be Blunt, a Confusion'>>> smalls = ['into', 'the', 'a', 'of', 'at', 'in', 'for', 'on', "and", "is", "to" ]
> >>> recase()
>
> 'Physicist Odd-Affection, Or How I Was Taught To Stop Fretting and Adore
> the Weapon of Mass Destruction'>>> recase("the end of the matter is in, to be blunt, a confusion")
>
> 'The End of the Matter is in, to Be Blunt, a Confusion'
>
>
>
> ? ? ? ? Of course, explaining what this construct is doing is the trick to
> justifying it for a homework assignment.
> --
> ? ? ? ? Wulfraed ? ? ? ? ? ? ? ? Dennis Lee Bieber ? ? ? ? AF6VN
> ? ? ? ? wlfr... at ix.netcom.com ? ?HTTP://wlfraed.home.netcom.com/

Too much destruction in this post man, and yeah I would not be able to
explain the code for my homework.


From tjreedy at udel.edu  Sun Sep 11 12:47:08 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 12:47:08 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
Message-ID: <j4iomc$te4$1@dough.gmane.org>

On 9/11/2011 12:01 AM, Ian Kelly wrote:
> On Sat, Sep 10, 2011 at 1:36 PM, Terry Reedy<tjreedy at udel.edu>  wrote:
>> The statement containing the explicit next(items) call can optionally be
>> wrapped to explicitly handle the case of an empty iterable in whatever
>> manner is desired.
>>
>> try:
>>     <set up with next(items)>
>> except StopIteration:
>>     raise ValueError("iterable cannot be empty")
>
> The only time that's optional

This is an opinion, or rather, a programming philosophy based on 
technical facts, rather than a fact itself. You do raise an important issue.

> is when you're writing an iterator and
> the try-except would end up looking like this:
>
> try:
>      # do stuff with next(items)
> except StopIteration:
>      raise StopIteration
>
> And even then, it's probably a good idea to clearly document that
> you're allowing a StopIteration from one iterator to propagate up as a
> StopIteration for another.

In the yield-pairs example,

def pairs(iterable):
     it = iter(iterable)
     for i in it:
         yield i, next(it)

ignoring StopIteration from the get-even explicit next means ignoring an 
odd item. If pairs() were in a general purpose library, it should have a 
doc string that specifies that, and a test case with an odd number of 
items. I would consider a comment in the code itself to be optional, 
depending on the intended or expected human audience and the context of 
presentation. In this context, the explanation is in the text that 
surrounds the code.

> Apart from that case, whenever you call next() you should always be
> prepared to catch a StopIteration.

To me, it depends on the contract or specification of the function. If 
the behavior for an empty input iterator is not specified, then there is 
no basis for writing the body of an except clause.

While in the past few months I have written examples of all of the three 
explicit-next use cases I gave, I was prompted to write them up now by 
Tigerstyle's 'Doctest failing' thread. The specification by example 
(perhaps given by an instructor) did not include an empty title that 
would lead to an empty list of title words. Certainly, the doc for

def fix_title(title):
     small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
     twords = iter(title.strip().lower().split())
     new_title = [next(twords)]
     for word in twords:
         if word not in small_words:
             word = word.title()
         new_title.append(word)
     return(' '.join(new_title))

should start "Given a title with at least one word, ...".

The Agile Programming Test-Driven-Development maxim, 'Write the minimum 
code needed to pass the test' says that the extra lines needed to catch 
and process StopIteration should *not* be written until there is a test 
case leading to such.

> Letting a StopIteration propagate
> up the stack to parts unknown is bad juju because it's a flow control
> exception, not an error-signaling exception.  If it happens to
> propagate up to another for loop, then it will break out of the for
> loop, and the exception will simply be swallowed.

What you are saying is a) that the following code

for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
     print(fix_title(title))

will print 'Amazing', 'A Hell of a Fight', and stop; b) that this is the 
worst choice of how to handle the empty title; and c) that in real world 
world programming, *someone* should decide whether fix_title('') returns 
'' or raises ValueError.

A counter-argument could be 1. that when a function's contract is 
violated, invoking unspecified behavior, anything is allowed; or 2. that 
titles are checked for actual content before the case fixup is called, 
and the time and mental energy required to define and test behavior for 
impossible input is wasted and better spent on something more useful.

-- 
Terry Jan Reedy



From andreas.perstinger at gmx.net  Sun Sep 11 12:47:42 2011
From: andreas.perstinger at gmx.net (Andreas Perstinger)
Date: Sun, 11 Sep 2011 18:47:42 +0200
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
Message-ID: <j4ionf$tjq$1@dough.gmane.org>

On 2011-09-11 13:17, Kayode Odeyemi wrote:
> On Sun, Sep 11, 2011 at 11:41 AM, Thomas Jollans<t at jollybox.de>  wrote:
>>  It is working:
>>
>>  >>>  class A(object):
>>  ...     def log (self, module):
>>  ...         return str ('logged')
>>  ...
>>  >>>  class B(A):
>>  ...     def __init__(self, module):
>>  ...         self.module = A().log(module)
>>  ...
>>  >>>  c = B('system')
>>  >>>  c.module
>>  'logged'
>
> Why do you have to do c.module? I'm expecting an output just by creating an
> instance of B.

Why do you expect an output? In B.__init__ you are just assigning the 
return value from A.log() to the attribute "module" and in A.log() there 
is no output either.

Bye, Andreas



From tjreedy at udel.edu  Sun Sep 11 13:03:32 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 13:03:32 -0400
Subject: Doctest failing
In-Reply-To: <fceb391d-8ac5-4eef-b89e-72c7327fc266@o26g2000vbi.googlegroups.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.943.1315677614.27778.python-list@python.org>
	<fceb391d-8ac5-4eef-b89e-72c7327fc266@o26g2000vbi.googlegroups.com>
Message-ID: <j4ipl4$4h7$1@dough.gmane.org>

On 9/11/2011 7:46 AM, Tigerstyle wrote:

> Thank you Terry,

> I went for this solution as it was the easiest for me to understand
> and comment myself keeping in mind what level I am at right now.
> Thanks a ton to everyone for sharing so much information and making it
> easy to read and understand your thoughts. This was surely very very
> educating read the replies from so many talented people.

You are welcome. For more, see my thread "Idioms combining 'next(items)' 
and 'for item in items:'" and the responses.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sun Sep 11 14:09:18 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 14:09:18 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4idpg$t29$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org> <j4idpg$t29$1@dough.gmane.org>
Message-ID: <j4itgf$1k9$1@dough.gmane.org>

On 9/11/2011 9:41 AM, Peter Otten wrote:
> Terry Reedy wrote:
>
>> 3. Process the items of an iterable in pairs.
>>
>> items = iter(iterable)
>> for first in items:
>>       second = next(items)
>>       <process first and second>
>>
>> This time, StopIteration is raised for an odd number of items. Catch and
>> process as desired. One possibility is to raise ValueError("Iterable
>> must have an even number of items").
>
> Another way is zip-based iteration:
>
> (a) silently drop the odd item
>
> items = iter(iterable)
> for first, second in zip(items, items): # itertools.izip in 2.x
>     ...

In practice, I would use this rather than the loop above. However, I 
wanted to introduce the idea then used in the intermittent pairing of 
surrogates.

> (b) add a fill value
>
> for first, second in itertools.zip_longest(items, items):
>      ...
>
> (c) raise an exception
>
> Unfortunately there is no zip_exc() that guarantees that all iterables are
> of the same "length", but I've written a recipe some time ago
>
> http://code.activestate.com/recipes/497006-zip_exc-a-lazy-zip-that-ensures-
> that-all-iterables/
>
> that achieves near-C speed.

Interesting. It took a moment to see the general idea. For some reason, 
you timeit examples in the comment now all have "data = [range(1000)]3", 
missing '*'.

-- 
Terry Jan Reedy



From ethan at stoneleaf.us  Sun Sep 11 14:43:38 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 11 Sep 2011 11:43:38 -0700
Subject: Doctest failing
In-Reply-To: <CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
Message-ID: <4E6D015A.3070500@stoneleaf.us>

Chris Angelico wrote:
> On Sat, Sep 10, 2011 at 10:24 PM, Alister Ware
> <alister.ware at ntlworld.com> wrote:
>> Ignoring the docttests my process would be to process each word & then
>> manually capitalize he 1st word, .I would als0 use a comprehension as
>> makes for cleaner code:-
>>
>> def capitalize(word):
>>    if word in small_words:
>>        return word
>>    else:
>>        return word.title()
> 
> And I'd do this with a lambda, but that's just me. Of course, if your
> logic is more complicated, it makes more sense to keep it in a named
> function, but a single conditional call can fit nicely into a lambda.

Lambdas are great when needed, but if don't *need* it, and you have more 
than a few, debugging can be a nightmare... "Okay, so this is function 
<lambda>... and that is function <lambda>... and over here we also have 
function <lambda>... ARGH!"

~Ethan~


From timr at probo.com  Sun Sep 11 14:48:01 2011
From: timr at probo.com (Tim Roberts)
Date: Sun, 11 Sep 2011 11:48:01 -0700
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <re0q675ntaul3914kgkd1118f7tf5grq70@4ax.com>

"Littlefield, Tyler" <tyler at tysdomain.com> wrote:
>
>I don't much care for PHP, but the thing that can be said for it is it's 
>pretty quick. How does Python compare?

PHP is quick for development, in that you can slap together some schlock
and have it mostly work.  The result, however, is usually schlock.  The
performance of the language itself is almost entirely irrelevant; the
execution time is swamped by the network overhead.

>I'm also curious what databases are suggested? I've always 
>done most of my work in MYSql, but from what I understand postgresql is 
>becoming more popular to.

Well, that's a religious argument.  Personally, I've always been confused
by the draw of MySql.  From the very beginning, Postgres has always been
more powerful, more reliable, more standard-compliant, and more
professional.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From ethan at stoneleaf.us  Sun Sep 11 15:01:53 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 11 Sep 2011 12:01:53 -0700
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4iomc$te4$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
Message-ID: <4E6D05A1.5010506@stoneleaf.us>

Terry Reedy wrote:
> On 9/11/2011 12:01 AM, Ian Kelly wrote:
>> On Sat, Sep 10, 2011 at 1:36 PM, Terry Reedy<tjreedy at udel.edu>  wrote:
>>> The statement containing the explicit next(items) call can optionally be
>>> wrapped to explicitly handle the case of an empty iterable in whatever
>>> manner is desired.
>>>
>>> try:
>>>     <set up with next(items)>
>>> except StopIteration:
>>>     raise ValueError("iterable cannot be empty")
>>
>> The only time that's optional
> 
> This is an opinion, or rather, a programming philosophy based on 
> technical facts, rather than a fact itself. You do raise an important 
> issue.
> 
>> is when you're writing an iterator and
>> the try-except would end up looking like this:
>>
>> try:
>>      # do stuff with next(items)
>> except StopIteration:
>>      raise StopIteration
>>
>> And even then, it's probably a good idea to clearly document that
>> you're allowing a StopIteration from one iterator to propagate up as a
>> StopIteration for another.
> 
> In the yield-pairs example,
> 
> def pairs(iterable):
>     it = iter(iterable)
>     for i in it:
>         yield i, next(it)
> 
> ignoring StopIteration from the get-even explicit next means ignoring an 
> odd item. If pairs() were in a general purpose library, it should have a 
> doc string that specifies that, and a test case with an odd number of 
> items. I would consider a comment in the code itself to be optional, 
> depending on the intended or expected human audience and the context of 
> presentation. In this context, the explanation is in the text that 
> surrounds the code.
> 
>> Apart from that case, whenever you call next() you should always be
>> prepared to catch a StopIteration.
> 
> To me, it depends on the contract or specification of the function. If 
> the behavior for an empty input iterator is not specified, then there is 
> no basis for writing the body of an except clause.
> 
> While in the past few months I have written examples of all of the three 
> explicit-next use cases I gave, I was prompted to write them up now by 
> Tigerstyle's 'Doctest failing' thread. The specification by example 
> (perhaps given by an instructor) did not include an empty title that 
> would lead to an empty list of title words. Certainly, the doc for
> 
> def fix_title(title):
>     small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>     twords = iter(title.strip().lower().split())
>     new_title = [next(twords)]
>     for word in twords:
>         if word not in small_words:
>             word = word.title()
>         new_title.append(word)
>     return(' '.join(new_title))
> 
> should start "Given a title with at least one word, ...".
> 
> The Agile Programming Test-Driven-Development maxim, 'Write the minimum 
> code needed to pass the test' says that the extra lines needed to catch 
> and process StopIteration should *not* be written until there is a test 
> case leading to such.
> 
>> Letting a StopIteration propagate
>> up the stack to parts unknown is bad juju because it's a flow control
>> exception, not an error-signaling exception.  If it happens to
>> propagate up to another for loop, then it will break out of the for
>> loop, and the exception will simply be swallowed.
> 
> What you are saying is a) that the following code
> 
> for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
>     print(fix_title(title))
> 
> will print 'Amazing', 'A Hell of a Fight', and stop; b) that this is the 
> worst choice of how to handle the empty title; and c) that in real world 
> world programming, *someone* should decide whether fix_title('') returns 
> '' or raises ValueError.
> 
> A counter-argument could be 1. that when a function's contract is 
> violated, invoking unspecified behavior, anything is allowed; or 2. that 
> titles are checked for actual content before the case fixup is called, 
> and the time and mental energy required to define and test behavior for 
> impossible input is wasted and better spent on something more useful.


Having spent hours tracking down errors because somebody did not address 
  a corner case, I find counter-argument 1 unhelpful.

Counter-argument 2 I can at least partially agree with; however, in this 
case where the uncaught exception can mess up flow control elsewhere I 
do not -- the StopIteration should be caught and changed to something 
appropriate, such as EmptyTitle (assuming blank titles are errors -- 
which they probably should be... "Hello, do you have the book '' for 
sale here?")

~Ethan~


From laurent.payot at gmail.com  Sun Sep 11 15:22:26 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sun, 11 Sep 2011 12:22:26 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <26428844-acd2-4c7b-bc6a-cf5a8a6259bc@glegroupsg2000goo.googlegroups.com>

+1 for PostgreSQL. It's faster than MySQL for years now, and is much more seriously featured.
If you don't need ACID properties (transactions stuff) you should also give Document-based databases like MongoDB a try. It changed my code life.


From laurent.payot at gmail.com  Sun Sep 11 15:22:26 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sun, 11 Sep 2011 12:22:26 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <26428844-acd2-4c7b-bc6a-cf5a8a6259bc@glegroupsg2000goo.googlegroups.com>

+1 for PostgreSQL. It's faster than MySQL for years now, and is much more seriously featured.
If you don't need ACID properties (transactions stuff) you should also give Document-based databases like MongoDB a try. It changed my code life.


From Phillip.M.Feldman at gmail.com  Sun Sep 11 15:41:33 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sun, 11 Sep 2011 12:41:33 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <j4iamn$ave$1@dough.gmane.org>
References: <32440187.post@talk.nabble.com> <j4iamn$ave$1@dough.gmane.org>
Message-ID: <32443548.post@talk.nabble.com>


Hello Peter,

When I run my code, I get the same 14 configurations that your code
produces; the only different that I can see in the output is that the
configurations are produced in a different order.  Note that your code is
not creating an iterator, so thus doesn't do what I want.  Also, generating
the product set and then testing whether the total number of balls is
correct will potentially consider a huge number of cases that must be
rejected because the sum is wrong; this is too inefficient.

Phillip

In [2]: list(balls_in_numbered_boxes(10,[4,3,2,1,2]))
Out[2]:
[(4, 3, 2, 1, 0),
 (4, 3, 2, 0, 1),
 (4, 3, 1, 1, 1),
 (4, 3, 1, 0, 2),
 (4, 3, 0, 1, 2),
 (4, 2, 2, 1, 1),
 (4, 2, 2, 0, 2),
 (4, 2, 1, 1, 2),
 (4, 1, 2, 1, 2),
 (3, 3, 2, 1, 1),
 (3, 3, 2, 0, 2),
 (3, 3, 1, 1, 2),
 (3, 2, 2, 1, 2),
 (2, 3, 2, 1, 2)]
-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32443548.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From Phillip.M.Feldman at gmail.com  Sun Sep 11 15:48:07 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sun, 11 Sep 2011 12:48:07 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <CAMZYqRSLbPz85KpEUH0QWiP=Jf-mUwjy8BGgOsj_mvFsFme_0g@mail.gmail.com>
References: <32440187.post@talk.nabble.com>
	<CAMZYqRSLbPz85KpEUH0QWiP=Jf-mUwjy8BGgOsj_mvFsFme_0g@mail.gmail.com>
Message-ID: <32443579.post@talk.nabble.com>


Chris,

Your code is much cleaner than mine.  I will have to figure out exactly how
it is working.

Thanks!

Phillip


-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32443579.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From hidura at gmail.com  Sun Sep 11 15:53:24 2011
From: hidura at gmail.com (hidura at gmail.com)
Date: Sun, 11 Sep 2011 19:53:24 +0000
Subject: using python in web applications
In-Reply-To: <re0q675ntaul3914kgkd1118f7tf5grq70@4ax.com>
References: <mailman.924.1315626929.27778.python-list@python.org><re0q675ntaul3914kgkd1118f7tf5grq70@4ax.com>
Message-ID: <952711646-1315770807-cardhu_decombobulator_blackberry.rim.net-827506045-@b12.c22.bise6.blackberry>

I am agree with postgresql i don' t have any problem, also is better for big applications. And Python is always better language than PHP if you' re going to create a web app.
Sent from my BlackBerry? wireless device

-----Original Message-----
From: Tim Roberts <timr at probo.com>
Sender: python-list-bounces+hidura=gmail.com at python.org
Date: Sun, 11 Sep 2011 11:48:01 
To: <python-list at python.org>
Subject: Re: using python in web applications

"Littlefield, Tyler" <tyler at tysdomain.com> wrote:
>
>I don't much care for PHP, but the thing that can be said for it is it's 
>pretty quick. How does Python compare?

PHP is quick for development, in that you can slap together some schlock
and have it mostly work.  The result, however, is usually schlock.  The
performance of the language itself is almost entirely irrelevant; the
execution time is swamped by the network overhead.

>I'm also curious what databases are suggested? I've always 
>done most of my work in MYSql, but from what I understand postgresql is 
>becoming more popular to.

Well, that's a religious argument.  Personally, I've always been confused
by the draw of MySql.  From the very beginning, Postgres has always been
more powerful, more reliable, more standard-compliant, and more
professional.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.
-- 
http://mail.python.org/mailman/listinfo/python-list

From __peter__ at web.de  Sun Sep 11 16:13:02 2011
From: __peter__ at web.de (Peter Otten)
Date: Sun, 11 Sep 2011 22:13:02 +0200
Subject: recursive algorithm for balls in numbered boxes
References: <32440187.post@talk.nabble.com> <j4iamn$ave$1@dough.gmane.org>
	<32443548.post@talk.nabble.com>
Message-ID: <j4j4nq$jkg$1@dough.gmane.org>

Dr. Phillip M. Feldman wrote:

> When I run my code, I get the same 14 configurations that your code
> produces; 

I'm sorry, I ran the buggy code from

http://old.nabble.com/file/p32439307/balls_in_numbered_boxes.py

without realizing it was not 

http://old.nabble.com/file/p32440187/balls_in_numbered_boxes.py

> the only different that I can see in the output is that the
> configurations are produced in a different order.  Note that your code is
> not creating an iterator, so thus doesn't do what I want.  

The outer loop is in a generator expression and thus evaluates lazily.

> Also,
> generating the product set and then testing whether the total number of
> balls is correct will potentially consider a huge number of cases that
> must be rejected because the sum is wrong; this is too inefficient.

Indeed; I should have added a disclaimer to make that clear.



From robert.kern at gmail.com  Sun Sep 11 16:22:28 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Sun, 11 Sep 2011 15:22:28 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <4E6C9614.60406@tim.thechases.com>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>	<j4h4dh$60n$1@dough.gmane.org>	<4E6C182D.60905@tim.thechases.com>
	<j4h8lh$qui$1@dough.gmane.org> <4E6C9614.60406@tim.thechases.com>
Message-ID: <j4j5a3$m5t$1@dough.gmane.org>

On 9/11/11 6:05 AM, Tim Chase wrote:

> As Ben Finney replied, optparse is now deprecated, replaced in part by argparse.
> Unfortunately, argparse wasn't backported to the standard library for earlier
> 2.x series (I think it became available in 2.7, and may run in earlier versions
> if manually added like I had to do on my Debian Py2.6 install). But that makes
> it hard for those of us who want to use a built-in option-parsing library across
> a wide variety of Python versions. I don't strongly care which I use except that
> I want it to be broadly available with minimal fuss.

argparse.py can be simply dropped into your codebase, if you want. That's about 
as minimal of fuss as you can ask for.

   http://pypi.python.org/pypi/argparse

-- 
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 rosuav at gmail.com  Sun Sep 11 18:41:05 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 08:41:05 +1000
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4iomc$te4$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
Message-ID: <CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 2:47 AM, Terry Reedy <tjreedy at udel.edu> wrote:
> What you are saying is a) that the following code
>
> for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
> ? ?print(fix_title(title))
>

At least in Python 3.2, this isn't the case. StopIteration breaks the
loop only if it's raised during the assignment, not during the body.

>>> x=iter([1,2,3,4,5])
>>> for i in x:
	print("%d - %d"%(i,next(x)))

1 - 2
3 - 4
Traceback (most recent call last):
  File "<pyshell#281>", line 2, in <module>
    print("%d - %d"%(i,next(x)))
StopIteration

Compare with:

>>> def pair(it):
	while True:
		yield next(it),next(it)

>>> x=iter([1,2,3,4,5])
>>> for i,j in pair(x):
	print("%d - %d"%(i,j))

1 - 2
3 - 4

In this case, the StopIteration bubbles up and quietly terminates the loop.

ChrisA


From tjreedy at udel.edu  Sun Sep 11 20:45:41 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 20:45:41 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
Message-ID: <j4jknm$cpd$1@dough.gmane.org>

On 9/11/2011 6:41 PM, Chris Angelico wrote:
> On Mon, Sep 12, 2011 at 2:47 AM, Terry Reedy<tjreedy at udel.edu>  wrote:
>> What you are saying is a) that the following code
>>
>> for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
>>     print(fix_title(title))

> At least in Python 3.2, this isn't the case. StopIteration breaks the
> loop only if it's raised during the assignment, not during the body.

It breaks the loop *silently* only if ...

>>>> x=iter([1,2,3,4,5])
>>>> for i in x:
> 	print("%d - %d"%(i,next(x)))
>
> 1 - 2
> 3 - 4
> Traceback (most recent call last):
>    File "<pyshell#281>", line 2, in<module>
>      print("%d - %d"%(i,next(x)))
> StopIteration

whereas, you are right, it breaks it noisily in the body. So Ian's claim 
that StopIteration must be caught to avoid silent termination is not 
true. Thanks for pointing out what I saw but did not cognize the full 
implication of before. A better exception and an error message with an 
explaination might still be a good idea, though.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sun Sep 11 21:03:24 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 11:03:24 +1000
Subject: Doctest failing
In-Reply-To: <4E6D015A.3070500@stoneleaf.us>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
Message-ID: <CAPTjJmqy7vE6-WZQMzbfiRo5q8xJXmAc5CjOpDDOR78mBNPiHQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 4:43 AM, Ethan Furman <ethan at stoneleaf.us> wrote:
> Chris Angelico wrote:
>>
>> And I'd do this with a lambda, but that's just me. Of course, if your
>> logic is more complicated, it makes more sense to keep it in a named
>> function, but a single conditional call can fit nicely into a lambda.
>
> Lambdas are great when needed, but if don't *need* it, and you have more
> than a few, debugging can be a nightmare... "Okay, so this is function
> <lambda>... and that is function <lambda>... and over here we also have
> function <lambda>... ARGH!"

Yeah, they can be like the Bruces sketch at times.

A lambda is basically a function defined in an expression. For instance:

def add_one(x):
   return x+1

is (practically) the same as:

add_one = lambda x: x+1

In each case, you can call that function and will get back a value.
The advantage of lambdas is that, in a list comprehension or map call,
the code is right there instead of being elsewhere in a def statement.
But as you can see, they quickly become hard to read:

[j+2 for i in [[1,2,3],[4,5,6],[7,8,9]] for j in (lambda x: [q+10 for
q in x])(i)]

Their main advantage isn't in list comps, where you can already use
arbitrary expressions, but in calls that require a function as an
argument. The map() function is very similar to a generator
expression, but it can iterate over multiple iterables at once:

>>> list(map(lambda x,y: x+y,[1,2,3],[40,50,60]))
[41, 52, 63]

Note how the lambda keeps the code right there, whereas a def would
separate it out. It's obvious from this one expression that it's
adding successive corresponding pairs.

Hope that helps!

ChrisA


From ben+python at benfinney.id.au  Sun Sep 11 21:37:10 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 12 Sep 2011 11:37:10 +1000
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
	<mailman.1011.1315789407.27778.python-list@python.org>
Message-ID: <87sjo2lewp.fsf@benfinney.id.au>

Chris Angelico <rosuav at gmail.com> writes:

> A lambda is basically a function defined in an expression. For instance:
>
> def add_one(x):
>    return x+1
>
> is (practically) the same as:
>
> add_one = lambda x: x+1

Those are only practically the same if you ignore the practical worth of
a function knowing the name it was defined with. The latter does not
have that, hence I don't see it as practically the same as the former.

-- 
 \     ?The Vatican is not a state.? a state must have territory. This |
  `\         is a palace with gardens, about as big as an average golf |
_o__)                         course.? ?Geoffrey Robertson, 2010-09-18 |
Ben Finney


From rosuav at gmail.com  Sun Sep 11 23:06:54 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 13:06:54 +1000
Subject: Doctest failing
In-Reply-To: <87sjo2lewp.fsf@benfinney.id.au>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
	<mailman.1011.1315789407.27778.python-list@python.org>
	<87sjo2lewp.fsf@benfinney.id.au>
Message-ID: <CAPTjJmoa1bgKjNzJm7crup43FQEc2BHU7=+_jJH2S=sXpWEYtA@mail.gmail.com>

On Mon, Sep 12, 2011 at 11:37 AM, Ben Finney <ben+python at benfinney.id.au> wrote:
> Those are only practically the same if you ignore the practical worth of
> a function knowing the name it was defined with. The latter does not
> have that, hence I don't see it as practically the same as the former.
>

I know, but in the context of explaining what "lambda" means, it's
practically the same. Lambdas can't (afaik) have docstrings either,
etc, etc, but in terms of defining lambda, the two are more-or-less
equivalent.

ChrisA


From steve+comp.lang.python at pearwood.info  Mon Sep 12 00:29:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 14:29:05 +1000
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
	<mailman.1011.1315789407.27778.python-list@python.org>
	<87sjo2lewp.fsf@benfinney.id.au>
	<mailman.1012.1315796817.27778.python-list@python.org>
Message-ID: <4e6d8a92$0$29972$c3e8da3$5496439d@news.astraweb.com>

On Mon, 12 Sep 2011 01:06 pm Chris Angelico wrote:

> On Mon, Sep 12, 2011 at 11:37 AM, Ben Finney <ben+python at benfinney.id.au>
> wrote:
>> Those are only practically the same if you ignore the practical worth of
>> a function knowing the name it was defined with. The latter does not
>> have that, hence I don't see it as practically the same as the former.
>>
> 
> I know, but in the context of explaining what "lambda" means, it's
> practically the same. Lambdas can't (afaik) have docstrings either,
> etc, etc, but in terms of defining lambda, the two are more-or-less
> equivalent.


>>> f = lambda x: x+1
>>> f.__name__ 
'<lambda>'
>>> f.__doc__ = "Return x+1"
>>> f.__name__ = "add_one"
>>> help(f)

Help on function add_one in module __main__:

add_one(x)
    Return x+1



Lambdas are functions, no more, no less. The only difference is that the
*syntax* of the lambda statement only allows a single expression rather
that the full block of a def, and no name. But because it returns an
ordinary function object, you can post-process it just like any other
function.

Unfortunately, tracebacks ignore the function.__name__ and print the code
object name:

>>> f
<function add_one at 0xb7eb425c>
>>> f("x")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in <lambda>
TypeError: cannot concatenate 'str' and 'int' objects


and the code object name is read-only:

>>> f.func_code.co_name
'<lambda>'
>>> f.func_code.co_name = "add_one"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: readonly attribute


-- 
Steven



From jpablo.romero at gmail.com  Mon Sep 12 00:34:26 2011
From: jpablo.romero at gmail.com (=?ISO-8859-1?Q?Juan_Pablo_Romero_M=E9ndez?=)
Date: Sun, 11 Sep 2011 23:34:26 -0500
Subject: What do you guys think about adding a method "to_json"
Message-ID: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>

Hello,

What do you guys think about adding a method "to_json" to dictionaries
and sequence types? Perhaps through a module import?

Regards,

  Juan Pablo


From clp2 at rebertia.com  Mon Sep 12 00:44:01 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 11 Sep 2011 21:44:01 -0700
Subject: What do you guys think about adding a method "to_json"
In-Reply-To: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
References: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
Message-ID: <CAMZYqRTwxeZqf_M-08xHnJRvidjHUXiGGh8O0ZJadqgbT77weA@mail.gmail.com>

2011/9/11 Juan Pablo Romero M?ndez <jpablo.romero at gmail.com>:
> Hello,
>
> What do you guys think about adding a method "to_json" to dictionaries
> and sequence types? Perhaps through a module import?

Why? We already have json.dumps(); seems to cover the use case.

Cheers,
Chris


From adam.jorgensen.za at gmail.com  Mon Sep 12 01:39:52 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Mon, 12 Sep 2011 07:39:52 +0200
Subject: What do you guys think about adding a method "to_json"
In-Reply-To: <CAMZYqRTwxeZqf_M-08xHnJRvidjHUXiGGh8O0ZJadqgbT77weA@mail.gmail.com>
References: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
	<CAMZYqRTwxeZqf_M-08xHnJRvidjHUXiGGh8O0ZJadqgbT77weA@mail.gmail.com>
Message-ID: <CAMX1RokqC7RLoG9ohdGhvUbpaUbrxBMLfUKQP8YL=1-P6nyWbw@mail.gmail.com>

Perhaps an actual use-case would clarify the need for this?

2011/9/12 Chris Rebert <clp2 at rebertia.com>

> 2011/9/11 Juan Pablo Romero M?ndez <jpablo.romero at gmail.com>:
> > Hello,
> >
> > What do you guys think about adding a method "to_json" to dictionaries
> > and sequence types? Perhaps through a module import?
>
> Why? We already have json.dumps(); seems to cover the use case.
>
> Cheers,
> Chris
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From alec.taylor6 at gmail.com  Mon Sep 12 03:49:31 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Mon, 12 Sep 2011 17:49:31 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
Message-ID: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>

Good evening,

I have converted ODT to HTML using LibreOffice Writer, because I want
to convert from HTML to Creole using python-creole. Unfortunately I
get this error: "File "Convert to Creole.py", line 17
SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
on line 18, but no encoding declared; see
http://www.python.org/peps/pep-0263.html for details".

Unfortunately I can't post my document yet (it's a research paper I'm
working on), but I'm sure you'll get the same result if you write up a
document in LibreOffice Writer and add some End Notes.

How do I automate the removal of all non-ascii characters from my code?

Thanks for all suggestions,

Alec Taylor


From gherron at islandtraining.com  Mon Sep 12 04:17:44 2011
From: gherron at islandtraining.com (Gary Herron)
Date: Mon, 12 Sep 2011 01:17:44 -0700
Subject: How do I automate the removal of all non-ascii characters from
	my	code?
In-Reply-To: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
Message-ID: <4E6DC028.1020101@islandtraining.com>

On 09/12/2011 12:49 AM, Alec Taylor wrote:
> Good evening,
>
> I have converted ODT to HTML using LibreOffice Writer, because I want
> to convert from HTML to Creole using python-creole. Unfortunately I
> get this error: "File "Convert to Creole.py", line 17
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 18, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details".
>
> Unfortunately I can't post my document yet (it's a research paper I'm
> working on), but I'm sure you'll get the same result if you write up a
> document in LibreOffice Writer and add some End Notes.
>
> How do I automate the removal of all non-ascii characters from my code?
>
> Thanks for all suggestions,
>
> Alec Taylor



This question does not quite make sense.  The error message is 
complaining about a python file.  What does that file have to do with 
ODT to HTML conversion and LibreOffice?

The error message means the python file (wherever it came from) has a 
non-ascii character (as you noted), and so it needs something to tell it 
what such a character means.  (That what the encoding is.)

A comment like this in line 1 or 2 will specify an encoding:
   # -*- coding: <encoding name> -*-
but, we'll have to know more about the file "Convert to Creole.py" to 
guess what encoding name should be specified there.

You might try utf-8 or latin-1.




From alec.taylor6 at gmail.com  Mon Sep 12 04:33:14 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Mon, 12 Sep 2011 18:33:14 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
Message-ID: <CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>

from creole import html2creole

from BeautifulSoup import BeautifulSoup

VALID_TAGS = ['strong', 'em', 'p', 'ul', 'li', 'br', 'b', 'i', 'a', 'h1', 'h2']

def sanitize_html(value):

? ?soup = BeautifulSoup(value)

? ?for tag in soup.findAll(True):
? ? ? ?if tag.name not in VALID_TAGS:
? ? ? ? ? ?tag.hidden = True

? ?return soup.renderContents()
html2creole(u(sanitize_html('''<h1
style="margin-left:76.8px;margin-right:0;text-indent:0;">Abstract</h1>
? ?<p class="Standard"
style="margin-left:76.8px;margin-right:0;text-indent:0;">
[more stuff here]
"""))

On Mon, Sep 12, 2011 at 6:17 PM, Gary Herron <gherron at islandtraining.com> wrote:
> On 09/12/2011 12:49 AM, Alec Taylor wrote:
>>
>> Good evening,
>>
>> I have converted ODT to HTML using LibreOffice Writer, because I want
>> to convert from HTML to Creole using python-creole. Unfortunately I
>> get this error: "File "Convert to Creole.py", line 17
>> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
>> on line 18, but no encoding declared; see
>> http://www.python.org/peps/pep-0263.html for details".
>>
>> Unfortunately I can't post my document yet (it's a research paper I'm
>> working on), but I'm sure you'll get the same result if you write up a
>> document in LibreOffice Writer and add some End Notes.
>>
>> How do I automate the removal of all non-ascii characters from my code?
>>
>> Thanks for all suggestions,
>>
>> Alec Taylor
>
>
>
> This question does not quite make sense. ?The error message is complaining
> about a python file. ?What does that file have to do with ODT to HTML
> conversion and LibreOffice?
>
> The error message means the python file (wherever it came from) has a
> non-ascii character (as you noted), and so it needs something to tell it
> what such a character means. ?(That what the encoding is.)
>
> A comment like this in line 1 or 2 will specify an encoding:
> ?# -*- coding: <encoding name> -*-
> but, we'll have to know more about the file "Convert to Creole.py" to guess
> what encoding name should be specified there.
>
> You might try utf-8 or latin-1.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From johnjohn.tedro at gmail.com  Mon Sep 12 04:35:44 2011
From: johnjohn.tedro at gmail.com (John-John Tedro)
Date: Mon, 12 Sep 2011 08:35:44 +0000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <4E6DC028.1020101@islandtraining.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
Message-ID: <CAJPn68RgM_UEg6oQmT8Y_MRQ+8EmypNP82uBhHLzT-_goxFiHQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 8:17 AM, Gary Herron <gherron at islandtraining.com>wrote:

> On 09/12/2011 12:49 AM, Alec Taylor wrote:
>
>> Good evening,
>>
>> I have converted ODT to HTML using LibreOffice Writer, because I want
>> to convert from HTML to Creole using python-creole. Unfortunately I
>> get this error: "File "Convert to Creole.py", line 17
>> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
>> on line 18, but no encoding declared; see
>> http://www.python.org/peps/**pep-0263.html<http://www.python.org/peps/pep-0263.html>for details".
>>
>> Unfortunately I can't post my document yet (it's a research paper I'm
>> working on), but I'm sure you'll get the same result if you write up a
>> document in LibreOffice Writer and add some End Notes.
>>
>> How do I automate the removal of all non-ascii characters from my code?
>>
>> Thanks for all suggestions,
>>
>> Alec Taylor
>>
>
>
>
> This question does not quite make sense.  The error message is complaining
> about a python file.  What does that file have to do with ODT to HTML
> conversion and LibreOffice?
>
> The error message means the python file (wherever it came from) has a
> non-ascii character (as you noted), and so it needs something to tell it
> what such a character means.  (That what the encoding is.)
>
> A comment like this in line 1 or 2 will specify an encoding:
>  # -*- coding: <encoding name> -*-
> but, we'll have to know more about the file "Convert to Creole.py" to guess
> what encoding name should be specified there.
>
> You might try utf-8 or latin-1.
>
>
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>

If you are having trouble figuring out which encoding your file has, the
"file" util is often a quick and dirty solution.

#> echo "???" > test.txt
#> file test.txt
test.txt: UTF-8 Unicode text
#> iconv test.txt -f utf-8 -t latin1 > test.l1.txt
#> file test.l1.txt
test.l1.txt: ISO-8859 text

Note: I use latin1 (iso-8859-1) because it can describe the characters '?',
'?', '?'. Your encoding might be different depending on what system you are
using.

The gist is that if you specify the correct encoding as mentioned above with
the "coding"-comment, your program will probably (ish) run as intended.

-- John-John Tedro
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From stefan_ml at behnel.de  Mon Sep 12 04:43:51 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 12 Sep 2011 10:43:51 +0200
Subject: How do I automate the removal of all non-ascii characters from
	my code?
In-Reply-To: <CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>	<4E6DC028.1020101@islandtraining.com>	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
Message-ID: <j4kgo7$gaq$1@dough.gmane.org>

Alec Taylor, 12.09.2011 10:33:
> from creole import html2creole
>
> from BeautifulSoup import BeautifulSoup
>
> VALID_TAGS = ['strong', 'em', 'p', 'ul', 'li', 'br', 'b', 'i', 'a', 'h1', 'h2']
>
> def sanitize_html(value):
>
>     soup = BeautifulSoup(value)
>
>     for tag in soup.findAll(True):
>         if tag.name not in VALID_TAGS:
>             tag.hidden = True
>
>     return soup.renderContents()
> html2creole(u(sanitize_html('''<h1
> style="margin-left:76.8px;margin-right:0;text-indent:0;">Abstract</h1>
>     <p class="Standard"
> style="margin-left:76.8px;margin-right:0;text-indent:0;">
> [more stuff here]
> """))

Hi,

I'm not sure what you are trying to say with the above code, but if it's 
the code that fails for you with the exception you posted, I would guess 
that the problem is in the "[more stuff here]" part, which likely contains 
a non-ASCII character. Note that you didn't declare the source file 
encoding above. Do as Gary told you.

Stefan



From steve+comp.lang.python at pearwood.info  Mon Sep 12 04:44:29 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 18:44:29 +1000
Subject: PC locks up with list operations
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e6dc66e$0$29986$c3e8da3$5496439d@news.astraweb.com>

On Wed, 31 Aug 2011 10:33 pm Steven D'Aprano wrote:

> Twice in a couple of weeks, I have locked up my PC by running a Python 2.5
> script that tries to create a list that is insanely too big.
> 
> In the first case, I (stupidly) did something like:
> 
> mylist = [0]*12345678901234
[...]
> Apart from "Then don't do that!", is there anything I can do to prevent
> this sort of thing in the future? Like instruct Python not to request more
> memory than my PC has?


For anyone who may care, I can report that ulimit under Linux will help with
this situation.

[steve at wow-wow ~]$ ulimit -v 200000
[steve at wow-wow ~]$ python
Python 2.5 (r25:51908, Nov  6 2007, 16:54:01)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> L = range(100000000)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
MemoryError

(Of course, I would have eventually got a MemoryError even without the
ulimit. *Eventually.* After much thrashing and processes crashing and
pain.)


Does anyone else think it would be useful for Python's memory manager to
enforce user-settable limits? Even just a simple thing like "never try to
allocate more than N bytes at once" would probably go a long way to prevent
a certain class of accidental (or deliberate) DOSes.


-- 
Steven



From steve+comp.lang.python at pearwood.info  Mon Sep 12 04:49:56 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 18:49:56 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>	<4E6DC028.1020101@islandtraining.com>	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
Message-ID: <4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>

On Mon, 12 Sep 2011 06:43 pm Stefan Behnel wrote:

> I'm not sure what you are trying to say with the above code, but if it's
> the code that fails for you with the exception you posted, I would guess
> that the problem is in the "[more stuff here]" part, which likely contains
> a non-ASCII character. Note that you didn't declare the source file
> encoding above. Do as Gary told you.

Even with a source code encoding, you will probably have problems with
source files including \xe2 and other "bad" chars. Unless they happen to
fall inside a quoted string literal, I would expect to get a SyntaxError.

I have come across this myself. While I haven't really investigated in great
detail, it appears to happen when copying and pasting code from a document
(usually HTML) which uses non-breaking spaces instead of \x20 space
characters. All it takes is just one to screw things up.



-- 
Steven



From ulrich.eckhardt at dominolaser.com  Mon Sep 12 06:00:08 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Mon, 12 Sep 2011 12:00:08 +0200
Subject: Terminating an embedded interpreter
Message-ID: <j211k8-n6i.ln1@satorlaser.homedns.org>

Hi!

I'm trying to provide some scripting capabilities to a program. For that, 
I'm embedding a Python interpreter, running a script in a separate thread to 
decouple it from the UI.

Now, how should I handle rogue scripts? For example, when a script hangs in 
an endless loop, how do I signal the Python interpreter to shut down? In 
other words, I want to trigger something like what Control-C does in a 
"normal" environment.

In case it matters, the OS here is MS Windows.

Thanks!

Uli

-- 
Domino Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From rmorgan466 at gmail.com  Mon Sep 12 06:34:52 2011
From: rmorgan466 at gmail.com (Rita)
Date: Mon, 12 Sep 2011 06:34:52 -0400
Subject: working with a large file
Message-ID: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>

I have a large file, 18gb uncompressed, and I would like to know what is the
preferred method to read this file for random access. I have several
processes reading the file which different calculate arguments. My server
has 64gb of memory. Not sure what is the preferred way to do this?




-- 
--- Get your facts first, then you can distort them as you please.--
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From rosuav at gmail.com  Mon Sep 12 06:38:47 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 20:38:47 +1000
Subject: Terminating an embedded interpreter
In-Reply-To: <j211k8-n6i.ln1@satorlaser.homedns.org>
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
Message-ID: <CAPTjJmq=bL8MT-H53-TPSXm2TtJOoFkMG-VNzUts_8sMk4SayQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 8:00 PM, Ulrich Eckhardt
<ulrich.eckhardt at dominolaser.com> wrote:
> Now, how should I handle rogue scripts? For example, when a script hangs in
> an endless loop, how do I signal the Python interpreter to shut down? In
> other words, I want to trigger something like what Control-C does in a
> "normal" environment.
>

You can use PyErr_SetInterrupt to raise KeyboardInterrupt, but it can
be caught by the script. There's no guaranteed way, short of killing
the process.

ChrisA


From wolfgang at rohdewald.de  Mon Sep 12 06:45:00 2011
From: wolfgang at rohdewald.de (Wolfgang Rohdewald)
Date: Mon, 12 Sep 2011 12:45:00 +0200
Subject: working with a large file
In-Reply-To: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
References: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
Message-ID: <201109121245.00224.wolfgang@rohdewald.de>

On Montag 12 September 2011, Rita wrote:
> I have a large file, 18gb uncompressed, and I would like to
> know what is the preferred method to read this file for
> random access. I have several processes reading the file
> which different calculate arguments. My server has 64gb of
> memory. Not sure what is the preferred way to do this?

if the data is structured, you could store it in 
something like sqlite

-- 
Wolfgang


From steve+comp.lang.python at pearwood.info  Mon Sep 12 07:08:22 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 21:08:22 +1000
Subject: Terminating an embedded interpreter
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
Message-ID: <4e6de828$0$29993$c3e8da3$5496439d@news.astraweb.com>

Ulrich Eckhardt wrote:

> Hi!
> 
> I'm trying to provide some scripting capabilities to a program. For that,
> I'm embedding a Python interpreter, running a script in a separate thread
> to decouple it from the UI.
> 
> Now, how should I handle rogue scripts? For example, when a script hangs
> in an endless loop, how do I signal the Python interpreter to shut down?

If you are using threads, they all run within the same Python process. You
can ask a thread to shut down, but you can't force it to from the outside.
If the thread runs a script that goes rogue, the script may never return
control to the thread long enough for it to respond to your request.

The main UI loop can still kill itself, and take all the threads with it, by
calling sys.exit. Or if you really need to, os.abort or os._exit can be
used for immediate "terminate yourself NOW!!!" commands. (But read the docs
for them first.)

A better way may be to run the script in a separate process. You can kill
the process the same way you would any other rogue process: by sending it a
signal. See the os and subprocess modules.

But Python's sandboxing abilities are not great. If you really fear rogue,
or malicious, scripts, perhaps Python is not the right language for this
task. Otherwise, just trust the script to be sane.



-- 
Steven



From roy at panix.com  Mon Sep 12 07:40:00 2011
From: roy at panix.com (Roy Smith)
Date: Mon, 12 Sep 2011 07:40:00 -0400
Subject: PC locks up with list operations
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<4e6dc66e$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-748F48.07400012092011@news.panix.com>

In article <4e6dc66e$0$29986$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> > mylist = [0]*12345678901234
> [...]
> > Apart from "Then don't do that!", is there anything I can do to prevent
> > this sort of thing in the future? Like instruct Python not to request more
> > memory than my PC has?
> 
> 
> For anyone who may care, I can report that ulimit under Linux will help with
> this situation.
> [...]
> Does anyone else think it would be useful for Python's memory manager to
> enforce user-settable limits?

Not me.  You've already discovered that ulimit does exactly what you 
want.  Why would be gained by having Python duplicate this functionality?


From ulrich.eckhardt at dominolaser.com  Mon Sep 12 08:01:47 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Mon, 12 Sep 2011 14:01:47 +0200
Subject: Terminating an embedded interpreter
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
	<4e6de828$0$29993$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <m681k8-lhm.ln1@satorlaser.homedns.org>

Steven D'Aprano wrote:
> Ulrich Eckhardt wrote:
>> I'm trying to provide some scripting capabilities to a program. For that,
>> I'm embedding a Python interpreter, running a script in a separate thread
>> to decouple it from the UI.
>> 
>> Now, how should I handle rogue scripts? For example, when a script hangs
>> in an endless loop, how do I signal the Python interpreter to shut down?
> 
> If you are using threads, they all run within the same Python process. You
> can ask a thread to shut down, but you can't force it to from the outside.
> If the thread runs a script that goes rogue, the script may never return
> control to the thread long enough for it to respond to your request.

Sorry, I described badly what I was doing. The program itself is written in 
C++ and I'm running the Python interpreter in a thread separate to the UI, 
just in order to not hang the UI if anything in the interpreter blocks for 
extended amounts of time. I know that a Python thread is not a "system" 
thread but handled and scheduled internally by Python.


> The main UI loop can still kill itself, and take all the threads with it,
> by calling sys.exit. Or if you really need to, os.abort or os._exit can be
> used for immediate "terminate yourself NOW!!!" commands. (But read the
> docs for them first.)

> A better way may be to run the script in a separate process. You can kill
> the process the same way you would any other rogue process: by sending it
> a signal. See the os and subprocess modules.

Yes, a separate process would be much cleaner, but it would complicate 
communication back to the parent process. The Python code is supposed to 
call a few functions I exported. I'd have to tunnel these calls through 
stdin/stdout/stderr and that is more than what I'm willing to do at the 
moment. It does sound intriguing though, since that would allow me to embed 
any scripting language, not just Python.


> But Python's sandboxing abilities are not great. If you really fear rogue,
> or malicious, scripts, perhaps Python is not the right language for this
> task. Otherwise, just trust the script to be sane.

I'm not fearing malicious scripts. I'm also not concerned about rare hangs 
since this in an internal tool. In this case, I'd take a simple 99% solution 
over a complex 100% solution.


Thank you for your thoughts, Steven!

Uli

-- 
Domino Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From ulrich.eckhardt at dominolaser.com  Mon Sep 12 08:05:04 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Mon, 12 Sep 2011 14:05:04 +0200
Subject: Terminating an embedded interpreter
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
	<mailman.1026.1315823930.27778.python-list@python.org>
Message-ID: <qc81k8-lhm.ln1@satorlaser.homedns.org>

Chris Angelico wrote:
> You can use PyErr_SetInterrupt to raise KeyboardInterrupt

This sounds useful. Just to make sure, this would be called from a different 
thread than the one running the Python script, is that still OK?

> , but it can be caught by the script. There's no guaranteed way,
> short of killing the process.

This will do for my plans, I'm not trying to defend against anything 
malicious.


Thanks you!

Uli


-- 
Domino Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From davea at ieee.org  Mon Sep 12 08:09:59 2011
From: davea at ieee.org (Dave Angel)
Date: Mon, 12 Sep 2011 08:09:59 -0400
Subject: How do I automate the removal of all non-ascii characters from
	my	code?
In-Reply-To: <4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>	<4E6DC028.1020101@islandtraining.com>	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E6DF697.2010208@ieee.org>

On 01/-10/-28163 02:59 PM, Steven D'Aprano wrote:
> On Mon, 12 Sep 2011 06:43 pm Stefan Behnel wrote:
>
>> I'm not sure what you are trying to say with the above code, but if it's
>> the code that fails for you with the exception you posted, I would guess
>> that the problem is in the "[more stuff here]" part, which likely contains
>> a non-ASCII character. Note that you didn't declare the source file
>> encoding above. Do as Gary told you.
> Even with a source code encoding, you will probably have problems with
> source files including \xe2 and other "bad" chars. Unless they happen to
> fall inside a quoted string literal, I would expect to get a SyntaxError.
>
> I have come across this myself. While I haven't really investigated in great
> detail, it appears to happen when copying and pasting code from a document
> (usually HTML) which uses non-breaking spaces instead of \x20 space
> characters. All it takes is just one to screw things up.
>
>

For me, more common than non-breaking space is the "smart quotes" 
characters.  In that case, one probably doesn't want to delete them, but 
instead convert them into standard quotes.

DaveA


From nobody at nowhere.com  Mon Sep 12 08:19:25 2011
From: nobody at nowhere.com (Nobody)
Date: Mon, 12 Sep 2011 13:19:25 +0100
Subject: PC locks up with list operations
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.599.1314794452.27778.python-list@python.org>
	<4e5e2d81$0$29991$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.12.12.19.25.369000@nowhere.com>

On Wed, 31 Aug 2011 22:47:59 +1000, Steven D'Aprano wrote:

>> Linux seems to fair badly when programs use more memory than physically
>> available. Perhaps there's some per-process thing that can be used to
>> limit things on Linux?
> 
> As far as I know, ulimit ("user limit") won't help. It can limit the amount
> of RAM available to a process, but that just makes the process start using
> virtual memory more quickly. It can also limit the amount of virtual memory
> used by the shell, but not of other processes. In other words, Linux will
> try really, really, really hard to give you the 84 gigabytes you've asked
> for on a 2 GB system, even if it means DOSing your system for a month.
> 
> Of course, I would be very happy to learn I'm wrong.

Resource limits set by ulimit are inherited by any processes spawned from
the shell. They also affect the shell itself, but a shell process
shouldn't require a lot of resources. You can use a subshell if you want
to impose limits on a specific process.

For Python, setting the limit on virtual memory (RAM + swap) to no more
than the amount of physical RAM is probably a wise move. Some processes
can use swap effectively, but the typical Python program probably can't.
There are exceptions, e.g. if most of the memory is accounted for by large
NumPy arrays and you're careful about the operations which are performed
upon them. But using large amounts of memory for many small objects is
almost bound to result in swap-thrashing.

One problem with doing this automatically (e.g. in .pythonrc) is the
inheritance issue; any processes spawned from the interpreter will also be
resource limited. Similarly, any binary libraries loaded into the
interpreter will be subject to the process' resource limits. Consequently,
there would be some advantages to the Python interpreter having its own
resource-limiting mechanism.



From ssegvic at zemris.fer.hr  Mon Sep 12 08:45:38 2011
From: ssegvic at zemris.fer.hr (=?utf-8?Q?Sini=C5=A1a_=C5=A0egvi=C4=87?=)
Date: Mon, 12 Sep 2011 14:45:38 +0200 (CEST)
Subject: Portable locale usage
In-Reply-To: <4E69DEE8.9050803@shopzeus.com>
Message-ID: <1616916126.29418.1315831538309.JavaMail.root@mail.zemris.fer.hr>

> From: "Laszlo Nagy" <gandalf at shopzeus.com>
> To: "Sini?a ?egvi?" <ssegvic at zemris.fer.hr>, python-list at python.org
> Sent: Friday, September 9, 2011 11:39:52 AM
> Subject: Re: Portable locale usage
> 
> Looks like you have found a bug! :-) Why don't you post a bug report?

I just did:

http://bugs.python.org/issue12964

Thanks everyone for helping me to sort this out!

Sinisa


From rosuav at gmail.com  Mon Sep 12 08:49:48 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 22:49:48 +1000
Subject: Terminating an embedded interpreter
In-Reply-To: <qc81k8-lhm.ln1@satorlaser.homedns.org>
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
	<mailman.1026.1315823930.27778.python-list@python.org>
	<qc81k8-lhm.ln1@satorlaser.homedns.org>
Message-ID: <CAPTjJmrH_HuA=7XeB-edAKyByXJ=VBn3842+X-uzEiKBtvx--A@mail.gmail.com>

On Mon, Sep 12, 2011 at 10:05 PM, Ulrich Eckhardt
<ulrich.eckhardt at dominolaser.com> wrote:
> Chris Angelico wrote:
>> You can use PyErr_SetInterrupt to raise KeyboardInterrupt
>
> This sounds useful. Just to make sure, this would be called from a different
> thread than the one running the Python script, is that still OK?
>
>> , but it can be caught by the script. There's no guaranteed way,
>> short of killing the process.
>
> This will do for my plans, I'm not trying to defend against anything
> malicious.

Yes, that would be what you want then. The main thing to take care of
is a blanket 'except' that doesn't specify what it's accepting - it'll
snarf the KeyboardInterrupt and carry on its merry way.

ChrisA


From duncan.booth at invalid.invalid  Mon Sep 12 09:06:47 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 12 Sep 2011 13:06:47 GMT
Subject: Idioms combining 'next(items)' and 'for item in items:'
References: <mailman.944.1315683474.27778.python-list@python.org>
Message-ID: <Xns9F5E8F6211D03duncanbooth@127.0.0.1>

Terry Reedy <tjreedy at udel.edu> wrote:

> The statement containing the explicit next(items) call can optionally be 
> wrapped to explicitly handle the case of an empty iterable in whatever 
> manner is desired.
> 
> try:
>      <set up with next(items)>
> except StopIteration:
>      raise ValueError("iterable cannot be empty")
> 
> 
Alternatively, if all you want is for an empty iterable to do nothing, you 
could write it like this:

    items = iter(iterable)
    for first in items:
        <process first>
        break
    for item in items:
        <process non-first>

However, the issue I have with any of this pulling the first element out of 
the loop is that if you want special processing for the first element you 
are likely to also want it for the last, and if it is a single item you need 
to process that item with both bits of special code. I don't see how that works 
unless you have all elements within the single loop and test for first/last.

> 2. Process the last item of an iterable differently. As far as I know, 
> this cannot be done for a generic iterable with a flag. It requires a 
> look ahead.

I think that must be correct, e.g. if reading from an interactive prompt you 
cannot detect end of input until you fail to read any more.

See my answer to http://stackoverflow.com/questions/7365372/is-there-a-pythonic-way-of-knowing-when-the-first-and-last-loop-in-a-for-is-being/7365552#7365552
for a generator that wraps the lookahead.

-- 
Duncan Booth http://kupuguy.blogspot.com


From miki.tebeka at gmail.com  Mon Sep 12 09:23:09 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 06:23:09 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <mailman.1016.1315813775.27778.python-list@python.org>
References: <mailman.1016.1315813775.27778.python-list@python.org>
Message-ID: <b773fdcd-3878-44c6-8f2c-2dd61cd6a704@glegroupsg2000goo.googlegroups.com>

You can add "# coding=UTF8" to the top of your file (see http://www.python.org/dev/peps/pep-0263/).

Of you want to remove unicode, there are several options, one of them is passing the file through "iconv --to ascii".


From miki.tebeka at gmail.com  Mon Sep 12 09:23:09 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 06:23:09 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <mailman.1016.1315813775.27778.python-list@python.org>
References: <mailman.1016.1315813775.27778.python-list@python.org>
Message-ID: <b773fdcd-3878-44c6-8f2c-2dd61cd6a704@glegroupsg2000goo.googlegroups.com>

You can add "# coding=UTF8" to the top of your file (see http://www.python.org/dev/peps/pep-0263/).

Of you want to remove unicode, there are several options, one of them is passing the file through "iconv --to ascii".


From j.reid at mail.cryst.bbk.ac.uk  Mon Sep 12 10:03:40 2011
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Mon, 12 Sep 2011 15:03:40 +0100
Subject: Easiest framework to develop simple interactive web site in python?
Message-ID: <j4l3ft$p6l$1@dough.gmane.org>

Hi,

I need to write a web interface for some computational biology software 
I've written:
http://sysbio.mrc-bsu.cam.ac.uk/johns/STEME/rst/_build/html/index.html

I don't have much experience writing web sites or applications. Can 
anyone recommend a python framework that will allow me to easily write a 
few pages? I need to accept some user input in the form of some options 
and download a potentially large file from the user's computer. The job 
can take some time to run so I'll need to notify them via email when it 
has finished.

I should say our group already uses an Apache web server so I'd like to 
host the pages from that server.

I know there are various python web frameworks but I don't want to learn 
a complicated one, I really just want the simplest tool for the job. Are 
any of the following suitable?

Zope, Django, Pylons, Grok, Pyramid

I see quite a few are listed here:
http://wiki.python.org/moin/WebFrameworks

Thanks in advance for any help,
John.



From stefan_ml at behnel.de  Mon Sep 12 10:10:44 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 12 Sep 2011 16:10:44 +0200
Subject: working with a large file
In-Reply-To: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
References: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
Message-ID: <j4l3t4$qub$1@dough.gmane.org>

Rita, 12.09.2011 12:34:
> I have a large file, 18gb uncompressed, and I would like to know what is the
> preferred method to read this file for random access. I have several
> processes reading the file which different calculate arguments. My server
> has 64gb of memory. Not sure what is the preferred way to do this?

It depends on the content (and likely also the operating system), but you 
might want to take a look at the mmap module.

Stefan



From wxjmfauth at gmail.com  Mon Sep 12 10:39:22 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Mon, 12 Sep 2011 07:39:22 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<mailman.1018.1315815474.27778.python-list@python.org>
Message-ID: <55455989-d2bf-44d6-b3cf-ba50f1e87a01@d14g2000yqb.googlegroups.com>

On 12 sep, 10:17, Gary Herron <gher... at islandtraining.com> wrote:
> On 09/12/2011 12:49 AM, Alec Taylor wrote:
>
>
>
> > Good evening,
>
> > I have converted ODT to HTML using LibreOffice Writer, because I want
> > to convert from HTML to Creole using python-creole. Unfortunately I
> > get this error: "File "Convert to Creole.py", line 17
> > SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> > on line 18, but no encoding declared; see
> >http://www.python.org/peps/pep-0263.htmlfor details".
>
> > Unfortunately I can't post my document yet (it's a research paper I'm
> > working on), but I'm sure you'll get the same result if you write up a
> > document in LibreOffice Writer and add some End Notes.
>
> > How do I automate the removal of all non-ascii characters from my code?
>
> > Thanks for all suggestions,
>
> > Alec Taylor
>

The coding of the characters is a domain per se.
It is independent from any OS's or applications.

When working with (plain) text files, you should
always be aware about the coding of the text you
are working on. If you are using coding directives,
you must ensure your coding directive matches
the real coding of the text files. A coding
directive is only informative, it does not set
the coding.

I'm pretty sure, you problem comes from this. There
is a mismatch somewhere, you are not aware of.
Removing ascii chars is certainly not a valuable
solution. It must work. If your are working
properly, it can not, not work.

Frome a linguistic point of view, the web has informed
me Creole (*all the Creoles*) can be composed with
the iso-8859-1 coding. That means, iso-8859-1, cp1252 and
all Unicode coding variants are possible coding directives.

jmf



From ericsnowcurrently at gmail.com  Mon Sep 12 10:44:01 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Mon, 12 Sep 2011 08:44:01 -0600
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
Message-ID: <CALFfu7DY3SJHO-U_a6ynbMrHNTQek6xtjSfV0=zZgmK8drtiMg@mail.gmail.com>

On Mon, Sep 12, 2011 at 1:49 AM, Alec Taylor <alec.taylor6 at gmail.com> wrote:
> Good evening,
>
> I have converted ODT to HTML using LibreOffice Writer, because I want
> to convert from HTML to Creole using python-creole. Unfortunately I
> get this error: "File "Convert to Creole.py", line 17
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 18, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details".
>
> Unfortunately I can't post my document yet (it's a research paper I'm
> working on), but I'm sure you'll get the same result if you write up a
> document in LibreOffice Writer and add some End Notes.
>
> How do I automate the removal of all non-ascii characters from my code?

Perhaps try "The Unicode Hammer".

http://code.activestate.com/recipes/251871/

-eric

>
> Thanks for all suggestions,
>
> Alec Taylor
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From wxjmfauth at gmail.com  Mon Sep 12 10:47:00 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Mon, 12 Sep 2011 07:47:00 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>

On 12 sep, 10:49, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
>
> Even with a source code encoding, you will probably have problems with
> source files including \xe2 and other "bad" chars. Unless they happen to
> fall inside a quoted string literal, I would expect to get a SyntaxError.
>

This is absurd and a complete non sense. The purpose
of a coding directive is to inform the engine, which
is processing a text file, about the "language" it
has to speak. Can be a html, py or tex file.
If you have problem, it's probably a mismatch between
your coding directive and the real coding of the
file. Typical case: ascii/utf-8 without signature.

jmf


From bestenborstel at gmail.com  Mon Sep 12 10:51:45 2011
From: bestenborstel at gmail.com (G.)
Date: Mon, 12 Sep 2011 07:51:45 -0700 (PDT)
Subject: Could you please give me some advise on this piece of code?
Message-ID: <cbfa6221-5a94-4fba-b5dd-3fe45789aad1@dq7g2000vbb.googlegroups.com>

Dear all,
I am a python newbie, but I intend to program a python script that
communicates with Labview via a UDP socket.
I managed to send LabView strings, but the other way around is not
working.
The code seems to stop working while in the first while loop. I can
see the word "test" being print out.

When I start LabView UDP_sender.vi it is supposed to send a string
back to python, but sometimes it ends with an error saying the port
and the ip is already in usage. Do I have to start first LabView or
the python scrip when listening to LabView, please?

It would be great if you could have a look on my code and could maybe
see why it does nothing after "print test", please.

Thank you very much.

Kind regards,
G.



# To change this template, choose Tools | Templates
# and open the template in the editor.

__author__="User"
__date__ ="$11.09.2011 19:34:03$"

if __name__ == "__main__":
    print "Das ist ein Test"

import socket
import time

#Define global variables for UDP_IP and UDP_Port, needs to be changed
for PETRA-3
#global UDP_IP
UDP_IP="127.0.0.1"
print "UDP_IP is", UDP_IP

#global UDP_PORT
UDP_PORT=21312
print "UDP_PORT is", UDP_PORT





def openUDPSocket(UDP_IP,UDP_PORT):
    #UDP_IP="127.0.0.1"
    #UDP_PORT=5005
    print "Creating socket ..."
    sock=socket.socket( socket.AF_INET, # Internet
                        socket.SOCK_DGRAM ) # UDP
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    #sock.setblocking(0)
    #sock.bind((UDP_IP,UDP_PORT))
    #sock.listen(1)
    print "Done."
    return sock

def fastPump(sock):
    # Start pumping and return
    MESSAGE="pumpfast"

   # print "UDP target IP:", UDP_IP
   # print "UDP target port:", UDP_PORT
   # print "message:", MESSAGE

    sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )

def slowPump(sock):
    MESSAGE="pumpslow"
    sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )


pumpsocketUDP=openUDPSocket(UDP_IP,UDP_PORT)


# Receive messages
counter_while_loop=0
print "test"
while counter_while_loop < 3:
	data,addr = pumpsocketUDP.recvfrom(1024)
        print "test"
	if not data:
		print "Client has exited!"
		break
	else:
		print "\nReceived message '", data,"'"
        counter_while_loop=counter_while_loop+1


counter_while_loop=0

while counter_while_loop < 3:
    fastPump(pumpsocketUDP)
    time.sleep(5)
    slowPump(pumpsocketUDP)
    time.sleep(3)

    counter_while_loop=counter_while_loop+1
    print "Counter_while_loop", counter_while_loop


# Close socket
pumpsocketUDP.close()


From w.brenig at tu-bs.de  Mon Sep 12 11:39:35 2011
From: w.brenig at tu-bs.de (Wolfram Brenig)
Date: Mon, 12 Sep 2011 17:39:35 +0200
Subject: ipython -wthread vs.  ipython -pylab
Message-ID: <9d6n9cFs53U1@mid.dfncis.de>

Hi,

I have a problem with the ipython shell: frequently, within one session 
I would like to do 2D plotting, using  matplotlib, as well as 3D 
visualization using mayavi

The man page for ipython, matplotlib, and mayavi tell me, that I must 
invoke ipython with
ipython -wthread for mayavi and
ipython -pylab for matplotlib
in order to avoid blocking (which indeed happens if I don't
use those options).
However, ipython's manpage also states, that only one of -wthread or 
-pylab can be given?

Does that imply I have to get out of the shell each time I want to 
switch from matplotlib to mayavi usage? Most likely no. But what should 
I do?

Thanks for your help

Wolfram


From matthias.huening at fu-berlin.de  Mon Sep 12 11:42:56 2011
From: matthias.huening at fu-berlin.de (Matthias Huening)
Date: Mon, 12 Sep 2011 17:42:56 +0200
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <9d6nk0FutiU1@mid.uni-berlin.de>

Am 12.09.2011 16:03, schrieb John Reid:
>
> I don't have much experience writing web sites or applications. Can
> anyone recommend a python framework that will allow me to easily write a
> few pages?

You want a simple framework? Try Bottle:
http://bottlepy.org/

Matthias


From Phillip.M.Feldman at gmail.com  Mon Sep 12 11:47:22 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Mon, 12 Sep 2011 08:47:22 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <a3b7c177-944c-4d86-9329-0a88fd410c67@y21g2000yqk.googlegroups.com>
References: <32440187.post@talk.nabble.com>
	<a3b7c177-944c-4d86-9329-0a88fd410c67@y21g2000yqk.googlegroups.com>
Message-ID: <32449079.post@talk.nabble.com>



Mark Dickinson-2 wrote:
> 
> 
> This is a well-known trick:  to divide 5 (unlabeled) balls amongst 3
> (labeled) boxes, you write down sequences of 5 o's and 2 x's, where
> the o's represent the 5 balls and the 'x's represent dividers:
> 
>     ooxooxo  -> [2, 2, 1]
>     xoooxoo  -> [0, 3, 2]
> 
> And 'combinations(7, 2)' yields successively all the possible
> different placements for the 2 dividers in the 7 symbols.
> 
> 
> This question seems to come up often enough (without the box size
> limit twist) that maybe it would be useful to include something like
> this recipe in the itertool documentation.
> 
> 
> For getting this into itertools, I'd suggest opening a feature request
> on bugs.python.org and assigning it to Raymond Hettinger.
> 
> --
> Mark
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

You are correct--the case without capacity limits can be handled using the
existing machinery in `itertools`.  BTW--That trick with the dividers is
discussed on page 38 of William Feller's classic text, "An Introduction to
Probability Theory and Its Applications".

As per your suggestion, I have opened a feature request and assigned it to
Raymond.  Thanks!
-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32449079.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From miki.tebeka at gmail.com  Mon Sep 12 12:48:42 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 09:48:42 -0700 (PDT)
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <c138a13f-6834-4dc2-bfcb-0c794e6c9234@glegroupsg2000goo.googlegroups.com>

I personally like CherryPy. But it all depends on your needs and style. I suggest you play with some of the packages and select one that you feel best with.


From miki.tebeka at gmail.com  Mon Sep 12 12:48:42 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 09:48:42 -0700 (PDT)
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <c138a13f-6834-4dc2-bfcb-0c794e6c9234@glegroupsg2000goo.googlegroups.com>

I personally like CherryPy. But it all depends on your needs and style. I suggest you play with some of the packages and select one that you feel best with.


From ian.g.kelly at gmail.com  Mon Sep 12 12:55:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 12 Sep 2011 10:55:14 -0600
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4jknm$cpd$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
	<j4jknm$cpd$1@dough.gmane.org>
Message-ID: <CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>

On Sun, Sep 11, 2011 at 6:45 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> whereas, you are right, it breaks it noisily in the body. So Ian's claim
> that StopIteration must be caught to avoid silent termination is not true.
> Thanks for pointing out what I saw but did not cognize the full implication
> of before. A better exception and an error message with an explaination
> might still be a good idea, though.

But you can't write the function under the assumption that it will
only be called from the function body.  The following is a slight
reorganization of your example that does exhibit the problem:

for title in map(fix_title, ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']):
    print(title)

Output:
amazing
a Hell of a Fight

Note that at first glance, my example would appear to be functionally
equivalent to yours -- I've merely pulled the fix_title call out of
the loop body and into the iterator.  But actually they produce
different results because fix_title misbehaves by not catching the
StopIteration.

Cheers,
Ian


From ian.g.kelly at gmail.com  Mon Sep 12 12:58:05 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 12 Sep 2011 10:58:05 -0600
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
	<j4jknm$cpd$1@dough.gmane.org>
	<CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
Message-ID: <CALwzidnPXzdf1ee9SY_61cs+AjbkTbAgqywX5pdqfcaTH1+x=A@mail.gmail.com>

On Mon, Sep 12, 2011 at 10:55 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> But you can't write the function under the assumption that it will
> only be called from the function body. ?The following is a slight
> reorganization of your example that does exhibit the problem:

s/function body/for-loop body/


From ian.g.kelly at gmail.com  Mon Sep 12 13:41:06 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 12 Sep 2011 11:41:06 -0600
Subject: Could you please give me some advise on this piece of code?
In-Reply-To: <cbfa6221-5a94-4fba-b5dd-3fe45789aad1@dq7g2000vbb.googlegroups.com>
References: <cbfa6221-5a94-4fba-b5dd-3fe45789aad1@dq7g2000vbb.googlegroups.com>
Message-ID: <CALwzidmVD+3EySCHjgjC97AQ=wGWMN6Bvj8+4-4uVCO8-9sbwQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 8:51 AM, G. <bestenborstel at gmail.com> wrote:
> When I start LabView UDP_sender.vi it is supposed to send a string
> back to python, but sometimes it ends with an error saying the port
> and the ip is already in usage. Do I have to start first LabView or
> the python scrip when listening to LabView, please?

If LabView is sending, then the Python script should already be
receiving, so start Python first.

> def openUDPSocket(UDP_IP,UDP_PORT):
> ? ?#UDP_IP="127.0.0.1"
> ? ?#UDP_PORT=5005
> ? ?print "Creating socket ..."
> ? ?sock=socket.socket( socket.AF_INET, # Internet
> ? ? ? ? ? ? ? ? ? ? ? ?socket.SOCK_DGRAM ) # UDP

I don't think this is sufficient to create a UDP socket.  To be safe,
you should specify the protocol as well:

sock = socket.socket(socket.AF_INET,
    socket.SOCK_DGRAM, socket.IPPROTO_UDP)

> ? ?#sock.bind((UDP_IP,UDP_PORT))

Your bind call is commented out, which means that your socket will be
bound to an arbitrary port selected by the OS.  This will make it hard
for LabView to send it messages, since it won't know what port to use.

Also, you appear to be using the same address and port for both
endpoints.  The UDP socket in Python and the UDP socket in LabView
should be bound to two separate ports.  This is probably why you were
getting the "port already in use" error, before you commented this
out.

> ? ?#sock.listen(1)

You don't need this at all.  listen() is for TCP sockets.

> def fastPump(sock):
> ? ?# Start pumping and return
> ? ?MESSAGE="pumpfast"
>
> ? # print "UDP target IP:", UDP_IP
> ? # print "UDP target port:", UDP_PORT
> ? # print "message:", MESSAGE
>
> ? ?sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )

The IP and port here should be that of the destination, i.e. the
address of the LabView socket.

> counter_while_loop=0
> print "test"
> while counter_while_loop < 3:
> ? ? ? ?data,addr = pumpsocketUDP.recvfrom(1024)
> ? ? ? ?print "test"
> ? ? ? ?if not data:
> ? ? ? ? ? ? ? ?print "Client has exited!"
> ? ? ? ? ? ? ? ?break
> ? ? ? ?else:
> ? ? ? ? ? ? ? ?print "\nReceived message '", data,"'"
> ? ? ? ?counter_while_loop=counter_while_loop+1

You should really use a for loop here:

for counter in range(3):
    data, addr = pumpsocketUPD.recvfrom(1024)
    print "Received message %r" % data

Note that if data is empty, it means that it received an empty
message, not that the client has exited.  It may be that you're having
the LabView client send an empty message when it exits, but this does
not happen automatically.

HTH,
Ian


From pruebauno at latinmail.com  Mon Sep 12 13:42:35 2011
From: pruebauno at latinmail.com (nn)
Date: Mon, 12 Sep 2011 10:42:35 -0700 (PDT)
Subject: convert time
References: <mailman.970.1315716418.27778.python-list@python.org>
	<4e6c4088$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <d4e6f206-d8ee-4fd4-bb72-c41dbf27cc43@fe21g2000vbb.googlegroups.com>

On Sep 11, 1:00?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> ???? wrote:
> > how can i convert "Dec 11" into ?2011-12?
>
> if my_str == "Dec 11":
> ? ? return 1999 ?# 2011 - 12
>
> Does that help?
>
> But seriously... 2011-12 is not a proper date, so the simplest way is
> probably something like this:
>
> def convert(date_str):
> ? ? month, short_year = date_str.split()
> ? ? if len(short_year) == 4:
> ? ? ? ? year = short_year
> ? ? else:
> ? ? ? ? year = '20' + short_year
> ? ? months = 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec'.split()
> ? ? month = months.index(month) + 1
> ? ? return year + '-' + str(month)
>
> Otherwise see the time and datetime modules:
>
> http://docs.python.org/library/time.htmlhttp://docs.python.org/library/datetime.html
>
> --
> Steven

Just a small comment that you can get "months" by doing:

from calendar import month_abbr
months = list(month_abbr)


From stefaan.himpe at gmail.com  Mon Sep 12 14:37:49 2011
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Mon, 12 Sep 2011 20:37:49 +0200
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <1ksbq.2549$ex3.1130@newsfe30.ams2>

The simplest one to learn is web2py http://www.web2py.com
No configuration needed, just unpack and get started.
It also has very good documentation and tons of little examples to get 
things done.

The other options you mentioned are good too :)



From tjreedy at udel.edu  Mon Sep 12 15:24:14 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 15:24:14 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <Xns9F5E8F6211D03duncanbooth@127.0.0.1>
References: <mailman.944.1315683474.27778.python-list@python.org>
	<Xns9F5E8F6211D03duncanbooth@127.0.0.1>
Message-ID: <j4lm90$8nk$1@dough.gmane.org>

On 9/12/2011 9:06 AM, Duncan Booth wrote:
> Terry Reedy<tjreedy at udel.edu>  wrote:
>
>> The statement containing the explicit next(items) call can optionally be
>> wrapped to explicitly handle the case of an empty iterable in whatever
>> manner is desired.
>>
>> try:
>>       <set up with next(items)>
>> except StopIteration:
>>       raise ValueError("iterable cannot be empty")
>>
>>
> Alternatively, if all you want is for an empty iterable to do nothing,

To do nothing, just pass above. If the function does nothing, it returns 
None. In the fix_title function, it should return '', not None.

> you could write it like this:
>
>      items = iter(iterable)
>      for first in items:
>          <process first>
>          break

I could, but I doubt I would ;-). Try...except StopIteration: pass is 
more explicit and less roundabout.

>      for item in items:
>          <process non-first>
>
> However, the issue I have with any of this pulling the first element out of
> the loop is that if you want special processing for the first element you
> are likely to also want it for the last,

Likely? I would say occasionally. Sentences have first words; file have 
headers. Special processing for last items is only an issue if it 
*replaces* the normal processing, rather than following the normal 
processing.

 > and if it is a single item you need
> to process that item with both bits of special code. I don't see how that works
> unless you have all elements within the single loop and test for first/last.

Like so, with tests:

def first_last_special(iterable):
     print("\nIterable is",repr(iterable))
     items = iter(iterable)
     try:
         first = next(items)
     except StopIteration:
         print('Nothing'); return
     print(first, 'is the first item')
     try:
         current = next(items)
     except StopIteration:
         current = first
     else:
         for item in items:
             print(current, 'is a middle item')
             current = item
     print(current, 'is the last item')

first_last_special('')
first_last_special('1')
first_last_special('12')
first_last_special('123')
first_last_special('12345')

-- 
Terry Jan Reedy



From georgeryoung at gmail.com  Mon Sep 12 15:49:51 2011
From: georgeryoung at gmail.com (gry)
Date: Mon, 12 Sep 2011 12:49:51 -0700 (PDT)
Subject: Python: Deleting specific words from a file.
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
	<mailman.898.1315548327.27778.python-list@python.org>
Message-ID: <22e15921-d543-4604-8996-3bcb2770ef18@et6g2000vbb.googlegroups.com>

On Sep 9, 2:04?am, Terry Reedy <tjre... at udel.edu> wrote:
> On 9/8/2011 9:09 PM, papu wrote:
>
>
>
> > Hello, I have a data file (un-structed messy file) from which I have
> > to scrub specific list of words (delete words).
>
> > Here is what I am doing but with no result:
>
> > infile = "messy_data_file.txt"
> > outfile = "cleaned_file.txt"
>
> > delete_list = ["word_1","word_2"....,"word_n"]
> > new_file = []
> > fin=open(infile,"")
> > fout = open(outfile,"w+")
> > for line in fin:
> > ? ? ?for word in delete_list:
> > ? ? ? ? ?line.replace(word, "")
> > ? ? ?fout.write(line)
> > fin.close()
> > fout.close()
>
> If you have very many words (and you will need all possible forms of
> each word if you do exact matches), The following (untested and
> incomplete) should run faster.
>
> delete_set = {"word_1","word_2"....,"word_n"}
> ...
> for line in fin:
> ? ? ?for word in line.split()
> ? ? ? ? ?if word not in delete_set:
> ? ? ? ? ? ? ?fout.write(word) # also write space and nl.
>
> Depending on what your file is like, you might be better with
> re.split('(\W+)', line). An example from the manual:
> ?>>> re.split('(\W+)', '...words, words...')
> ['', '...', 'words', ', ', 'words', '...', '']
>
> so all non-word separator sequences are preserved and written back out
> (as they will not match delete set).
>
> --
> Terry Jan Reedy

re.sub is handy too:
import re
delete_list=('the','rain','in','spain')
regex =  re.compile('\W' + '|'.join(delete_list) + '\W')
infile='messy'
with open(infile, 'r') as f:
    for l in f:
        print regex.sub('', l)


From python at mrabarnett.plus.com  Mon Sep 12 16:42:21 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 12 Sep 2011 21:42:21 +0100
Subject: Python: Deleting specific words from a file.
In-Reply-To: <22e15921-d543-4604-8996-3bcb2770ef18@et6g2000vbb.googlegroups.com>
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
	<mailman.898.1315548327.27778.python-list@python.org>
	<22e15921-d543-4604-8996-3bcb2770ef18@et6g2000vbb.googlegroups.com>
Message-ID: <4E6E6EAD.5040306@mrabarnett.plus.com>

On 12/09/2011 20:49, gry wrote:
> On Sep 9, 2:04 am, Terry Reedy<tjre... at udel.edu>  wrote:
>> On 9/8/2011 9:09 PM, papu wrote:
>>
>>
>>
>>> Hello, I have a data file (un-structed messy file) from which I have
>>> to scrub specific list of words (delete words).
>>
>>> Here is what I am doing but with no result:
>>
>>> infile = "messy_data_file.txt"
>>> outfile = "cleaned_file.txt"
>>
>>> delete_list = ["word_1","word_2"....,"word_n"]
>>> new_file = []
>>> fin=open(infile,"")
>>> fout = open(outfile,"w+")
>>> for line in fin:
>>>       for word in delete_list:
>>>           line.replace(word, "")
>>>       fout.write(line)
>>> fin.close()
>>> fout.close()
>>
>> If you have very many words (and you will need all possible forms of
>> each word if you do exact matches), The following (untested and
>> incomplete) should run faster.
>>
>> delete_set = {"word_1","word_2"....,"word_n"}
>> ...
>> for line in fin:
>>       for word in line.split()
>>           if word not in delete_set:
>>               fout.write(word) # also write space and nl.
>>
>> Depending on what your file is like, you might be better with
>> re.split('(\W+)', line). An example from the manual:
>>   >>>  re.split('(\W+)', '...words, words...')
>> ['', '...', 'words', ', ', 'words', '...', '']
>>
>> so all non-word separator sequences are preserved and written back out
>> (as they will not match delete set).
>>
>> --
>> Terry Jan Reedy
>
> re.sub is handy too:
> import re
> delete_list=('the','rain','in','spain')
> regex =  re.compile('\W' + '|'.join(delete_list) + '\W')

You need parentheses around the words (I'm using non-capturing
parentheses):

regex =  re.compile(r'\W(?:' + '|'.join(delete_list) + r')\W')

otherwise you'd get: '\Wthe|rain|in|spain\W'.

Even better is the word-boundary, in case there's no previous or next
character:

regex =  re.compile(r'\b(?:' + '|'.join(delete_list) + r')\b')

Raw string literals are recommended for regexes.

> infile='messy'
> with open(infile, 'r') as f:
>      for l in f:
>          print regex.sub('', l)


From tjreedy at udel.edu  Mon Sep 12 16:51:01 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 16:51:01 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
	<j4jknm$cpd$1@dough.gmane.org>
	<CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
Message-ID: <j4lrbn$dqa$1@dough.gmane.org>

On 9/12/2011 12:55 PM, Ian Kelly wrote:
> On Sun, Sep 11, 2011 at 6:45 PM, Terry Reedy<tjreedy at udel.edu>  wrote:
>> whereas, you are right, it breaks it noisily in the body. So Ian's claim
>> that StopIteration must be caught to avoid silent termination is not true.
>> Thanks for pointing out what I saw but did not cognize the full implication
>> of before. A better exception and an error message with an explaination
>> might still be a good idea, though.
>
> But you can't write the function under the assumption that it will
> only be called from the function body.

Sigh. You are right.

>  The following is a slight
> reorganization of your example that does exhibit the problem:
>
> for title in map(fix_title, ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']):
>      print(title)
>
> Output:
> amazing
> a Hell of a Fight
>
> Note that at first glance, my example would appear to be functionally
> equivalent to yours -- I've merely pulled the fix_title call out of
> the loop body and into the iterator.  But actually they produce
> different results because fix_title misbehaves by not catching the
> StopIteration.

You are right, non-iterators should not raise or pass on StopIteration. 
There are actually several reasons.

1. The manual defined StopIteration as meaning '[I have] no more values 
[to give you]'. This is only meaningful coming from an iterator.

2. Your particular point is that StopIteration is (almost) unique in 
being sometimes, but only sometimes, caught by the interpreter, rather 
than just by user except clauses. AttributeError is another, which has 
occasionally caused its own problems. But we cannot stop raising 
AttributeError while we can always catch StopIteration for explicit 
next() (and should outside of iterators).

3. In the case of grabbing the first item from an iterator, no first 
item is a boundary case for the expected, legal type of input. I believe 
boundary cases should be included in function specifications. While 
there may be a couple of choices as to response, that is much less than 
infinity. For fix_title, the choices are ValueError or ''. Any other 
return would be an error unless explicitly given in the specs. So the 
boundary case should be included in the test suite to exclude any other 
random response.

4. StopIteration is an artifact of the choice of implementation. Pulling 
the first item out before the loop is an alternative to a flag and 
testing within the loop. Such an implementation detail should not leak 
into the user's view of the function as an abstraction.

If fix_title were a generator function whose instances yielded fixed 
title words one at a time, then the bare next() would be correct (as you 
noted). But it is not, and the difference is important, more important 
than having 'minimal clean code'. Thank you for persisting until I saw 
that in this context.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep 12 16:53:24 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 16:53:24 -0400
Subject: PC locks up with list operations
In-Reply-To: <roy-748F48.07400012092011@news.panix.com>
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<4e6dc66e$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<roy-748F48.07400012092011@news.panix.com>
Message-ID: <j4lrg5$dqa$2@dough.gmane.org>

On 9/12/2011 7:40 AM, Roy Smith wrote:
> In article<4e6dc66e$0$29986$c3e8da3$5496439d at news.astraweb.com>,
>   Steven D'Aprano<steve+comp.lang.python at pearwood.info>  wrote:
>
>>> mylist = [0]*12345678901234
>> [...]
>>> Apart from "Then don't do that!", is there anything I can do to prevent
>>> this sort of thing in the future? Like instruct Python not to request more
>>> memory than my PC has?
>>
>>
>> For anyone who may care, I can report that ulimit under Linux will help with
>> this situation.
>> [...]
>> Does anyone else think it would be useful for Python's memory manager to
>> enforce user-settable limits?
>
> Not me.  You've already discovered that ulimit does exactly what you
> want.  Why would be gained by having Python duplicate this functionality?

Having it on Windows.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep 12 17:04:50 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 17:04:50 -0400
Subject: What do you guys think about adding a method "to_json"
In-Reply-To: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
References: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
Message-ID: <j4ls5k$jk2$1@dough.gmane.org>

On 9/12/2011 12:34 AM, Juan Pablo Romero M?ndez wrote:
> Hello,
>
> What do you guys think about adding a method "to_json" to dictionaries
> and sequence types? Perhaps through a module import?

Negative. If this were added, why not to_yaml, to_marshal, to_pickle, 
to_zip, and so on. Better to have each storage or transfer class handle 
its own instance creation. The one to_x method that every class should 
have is to_string, which is spelled __str__ and inherited from object.

-- 
Terry Jan Reedy




From rhodri at wildebst.demon.co.uk  Mon Sep 12 17:39:41 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 12 Sep 2011 22:39:41 +0100
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
Message-ID: <op.v1ps4fqia8ncjz@gnudebst>

On Mon, 12 Sep 2011 15:47:00 +0100, jmfauth <wxjmfauth at gmail.com> wrote:

> On 12 sep, 10:49, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
>>
>> Even with a source code encoding, you will probably have problems with
>> source files including \xe2 and other "bad" chars. Unless they happen to
>> fall inside a quoted string literal, I would expect to get a  
>> SyntaxError.
>>
>
> This is absurd and a complete non sense. The purpose
> of a coding directive is to inform the engine, which
> is processing a text file, about the "language" it
> has to speak. Can be a html, py or tex file.
> If you have problem, it's probably a mismatch between
> your coding directive and the real coding of the
> file. Typical case: ascii/utf-8 without signature.

Now read what Steven wrote again.  The issue is that the program contains  
characters that are syntactically illegal.  The "engine" can be perfectly  
correctly translating a character as a smart quote or a non breaking space  
or an e-umlaut or whatever, but that doesn't make the character legal!

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


From rantingrick at gmail.com  Mon Sep 12 18:04:15 2011
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 12 Sep 2011 15:04:15 -0700 (PDT)
Subject: PyWart: Itertools module needs attention
Message-ID: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>


############################################################
#                          Quote                           #
############################################################
# The itertools module is great HOWEVER i believe most     #
# people are recreating the functionalities due to the     #
# insanely cryptic and/or missing examples from each       #
# method                                                   #
############################################################

py> print itertools.chain.__doc__
chain(*iterables) --> chain object
Return a chain object whose .next() method returns elements from the
first iterable until it is exhausted, then elements from the next
iterable, until all of the iterables are exhausted.

############################################################
#                          Quote                           #
############################################################
# Okay not TOO bad however this simple example would       #
# suffice:                                                 #
############################################################

py> list(itertools.chain([1,2], [3,[4,5],6]))
[1, 2, 3, [4, 5], 6]

############################################################
#                          Quote                           #
############################################################
# Same for these...                                        #
############################################################

py> ''.join(list(itertools.dropwhile(lambda x:x==" ", "    hello
word    ")))
'hello word    '
py> ''.join(list(itertools.takewhile(lambda x:x==" ", "    hello
word    ")))
'    '
py> print itertools.compress.__doc__
compress(data, selectors) --> iterator over selected data
Return data elements corresponding to true selector elements.
Forms a shorter iterator from selected data elements using the
selectors to choose the data elements.

############################################################
#                          Quote                           #
############################################################
# WTF! Would you like to define a Python "selector". Could #
# it be that we should be using "selector function" or     #
# "predicate function" instead?                            #
############################################################


From nstinemates at gmail.com  Mon Sep 12 18:25:49 2011
From: nstinemates at gmail.com (Nick Stinemates)
Date: Mon, 12 Sep 2011 22:25:49 +0000
Subject: PyWart: Itertools module needs attention
In-Reply-To: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
Message-ID: <CANWvZ3RSUJHTaa8PifE-htO5+L-PvDMDJqJGGrYP67W_m1cOxw@mail.gmail.com>

On Mon, Sep 12, 2011 at 10:04 PM, rantingrick <rantingrick at gmail.com> wrote:

>
> ############################################################
> #                          Quote                           #
> ############################################################
> # The itertools module is great HOWEVER i believe most     #
> # people are recreating the functionalities due to the     #
> # insanely cryptic and/or missing examples from each       #
> # method                                                   #
> ############################################################
>
> py> print itertools.chain.__doc__
> chain(*iterables) --> chain object
> Return a chain object whose .next() method returns elements from the
> first iterable until it is exhausted, then elements from the next
> iterable, until all of the iterables are exhausted.
>
> ############################################################
> #                          Quote                           #
> ############################################################
> # Okay not TOO bad however this simple example would       #
> # suffice:                                                 #
> ############################################################
>
> py> list(itertools.chain([1,2], [3,[4,5],6]))
> [1, 2, 3, [4, 5], 6]
>
> ############################################################
> #                          Quote                           #
> ############################################################
> # Same for these...                                        #
> ############################################################
>
> py> ''.join(list(itertools.dropwhile(lambda x:x==" ", "    hello
> word    ")))
> 'hello word    '
> py> ''.join(list(itertools.takewhile(lambda x:x==" ", "    hello
> word    ")))
> '    '
> py> print itertools.compress.__doc__
> compress(data, selectors) --> iterator over selected data
> Return data elements corresponding to true selector elements.
> Forms a shorter iterator from selected data elements using the
> selectors to choose the data elements.
>
> ############################################################
> #                          Quote                           #
> ############################################################
> # WTF! Would you like to define a Python "selector". Could #
> # it be that we should be using "selector function" or     #
> # "predicate function" instead?                            #
> ############################################################
> --
> http://mail.python.org/mailman/listinfo/python-list


I'm honestly missing the point of this mail.

Can you elaborate?
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From vlastimil.brom at gmail.com  Mon Sep 12 18:49:49 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 13 Sep 2011 00:49:49 +0200
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
Message-ID: <CAHzaPEOjU5GKzE5k5T72mFDVXuS+yp4UPj-dZSurFF6z+-g3xw@mail.gmail.com>

2011/9/12 Alec Taylor <alec.taylor6 at gmail.com>:
> Good evening,
>
> I have converted ODT to HTML using LibreOffice Writer, because I want
> to convert from HTML to Creole using python-creole. Unfortunately I
> get this error: "File "Convert to Creole.py", line 17
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 18, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details".
>
> Unfortunately I can't post my document yet (it's a research paper I'm
> working on), but I'm sure you'll get the same result if you write up a
> document in LibreOffice Writer and add some End Notes.
>
> How do I automate the removal of all non-ascii characters from my code?
>
> Thanks for all suggestions,
>
> Alec Taylor
> --
> http://mail.python.org/mailman/listinfo/python-list
>

It would obviously help to see the content of the line mentioned in
the traceback (and probably its context);
however, that value seems to correspond with ? in some European
encodings, in which case it would probably be part of some quoted
unicode/string literal. (at least in python 2, in python3 it could
also be a name of an object in python code, the traceback seems to be
the same for both cases.)
cf.
>>> print '\xe2'.decode("iso-8859-1")
?
# and likewise for iso-8859-... 1,2,3,4; 9, 10, 14, 15, 16, some
windows- encodings etc.

Possibly (as previouslz suggested) adding the encoding information
like iso-8859-1 or windows-1252 or others depending on other data etc.
at the top of the source file might fix the error. Which would be
certainly preferable to throwing all non ascii data away.
Zou would add e.g.
# -*- coding: iso-8859-1 -*-
as the first or second line of the file.

hth,
 vbr


From ethan at stoneleaf.us  Mon Sep 12 19:29:07 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Mon, 12 Sep 2011 16:29:07 -0700
Subject: PyWart: Itertools module needs attention
In-Reply-To: <CANWvZ3RSUJHTaa8PifE-htO5+L-PvDMDJqJGGrYP67W_m1cOxw@mail.gmail.com>
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
	<CANWvZ3RSUJHTaa8PifE-htO5+L-PvDMDJqJGGrYP67W_m1cOxw@mail.gmail.com>
Message-ID: <4E6E95C3.7010708@stoneleaf.us>

Nick Stinemates wrote:
> I'm honestly missing the point of this mail.


rantingrick is a well-known troll, and doesn't need to have a point.

Please do not feed the troll.

~Ethan~


From 1248283536 at qq.com  Mon Sep 12 23:08:57 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 13 Sep 2011 11:08:57 +0800
Subject: =?gbk?B?u9i4tKO6IHN0cmFuZyB0aGluZzo=?=
Message-ID: <tencent_2E597A88625A5CD96468ACC4@qq.com>

i change  open into open1,it's ok now
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()     
    for row in csv.reader(file):
            (date,open1,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
            print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]


but i want "open"  to be my data field,not  open1  to be my field ,
how can i do?
 
 
------------------ ???? ------------------
???: "Chris Angelico"<rosuav at gmail.com>;
????: 2011?9?6?(???) ??4:22
???: "python-list"<python-list at python.org>; 

??: Re: strang thing:

 
2011/9/6 ???? <1248283536 at qq.com>:
>     file = open(filename,'r')

> when i  add    (date,open,high,low,close,vol,adjclose) = (row[0], row[1],

You're assigning to the name "open", which is shadowing the built-in
of the same name. The second time through the loop, you're not calling
the usual open() function, you're trying to call your string. That's
what your error is telling you.

Hope that helps!

ChrisA
-- 
http://mail.python.org/mailman/listinfo/python-list
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From 1248283536 at qq.com  Mon Sep 12 23:12:03 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 13 Sep 2011 11:12:03 +0800
Subject: =?gbk?B?u9i4tKO6IHN0cmFuZyB0aGluZzo=?=
Message-ID: <tencent_145978174FECFB2B0598BC51@qq.com>

i change  open into open1,it's ok now
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()     
    for row in csv.reader(file):
            (date,open1,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
            print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]


but i want "open"  to be my data field,not  open1  to be my field ,
how can i do?
 
 
------------------ ???? ------------------
???: "Chris Angelico"<rosuav at gmail.com>;
????: 2011?9?6?(???) ??4:22
???: "python-list"<python-list at python.org>; 

??: Re: strang thing:

 
2011/9/6 ???? <1248283536 at qq.com>:
>     file = open(filename,'r')

> when i  add    (date,open,high,low,close,vol,adjclose) = (row[0], row[1],

You're assigning to the name "open", which is shadowing the built-in
of the same name. The second time through the loop, you're not calling
the usual open() function, you're trying to call your string. That's
what your error is telling you.

Hope that helps!

ChrisA
-- 
http://mail.python.org/mailman/listinfo/python-list
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From chunuan723 at gmail.com  Mon Sep 12 23:15:10 2011
From: chunuan723 at gmail.com (he sharon)
Date: Mon, 12 Sep 2011 20:15:10 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <14aa0131-2040-456d-9218-0200c968d166@u17g2000prc.googlegroups.com>

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and so on.


From steve+comp.lang.python at pearwood.info  Mon Sep 12 23:28:33 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 13 Sep 2011 13:28:33 +1000
Subject: strang thing:
References: <mailman.793.1315297135.27778.python-list@python.org>
Message-ID: <4e6ecde2$0$29965$c3e8da3$5496439d@news.astraweb.com>

(I sent this reply a week ago, but it seems to have disappeared. So trying
again.)


On Tue, 6 Sep 2011 06:18 pm ???? wrote:

> when i ?add ? ?(date,open,high,low,close,vol,adjclose) = (row[0], row[1],
> row[2], row[3],row[4], row[5], row[6]) change the code into

Here you define a new variable called "open", which has the value of row[1].
This shadows (hides) the built-in function also called "open", so later
when you do this:

> ? ? file = open(filename,'r')
> TypeError: 'str' object is not callable

Python uses your string variable "open" instead of the built-in function.

The best solution is to avoid using the name "open", instead call it "open_"
(underscore at the end is the usual convention to avoid shadowing
built-ins). Or "open_value" or any other appropriate name.

Another solution is to save a reference to the open built-in first:

my_open = open
open = "something"
file = my_open("filename", "r")




-- 
Steven



From rosuav at gmail.com  Mon Sep 12 23:42:56 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 13 Sep 2011 13:42:56 +1000
Subject: strang thing:
In-Reply-To: <4e6ecde2$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.793.1315297135.27778.python-list@python.org>
	<4e6ecde2$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmpQ9OeigD-=FF6qmc0K+UV49ecrz4+hBQvCdSPk230ECg@mail.gmail.com>

On Tue, Sep 13, 2011 at 1:28 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> The best solution is to avoid using the name "open", instead call it "open_"
> (underscore at the end is the usual convention to avoid shadowing
> built-ins). Or "open_value" or any other appropriate name.
>

This is why every good programmer keeps a thesaurus handy. I just now
had a "concept collision" on the word 'cancel', and did a quick search
to come up with 'annul' as an alternative. Although in this case I
didn't search my thesaurus, I actually looked for Magic: The Gathering
cards... yeah, I'm a nerd, aren't you? :)

There's lots of synonyms for open, and it's entirely possible that one
will work. Otherwise, Steven's other solution works just fine too, and
you can go humorous with that too:

sesame = open
open = "something"
file = sesame("filename", "r")

ChrisA


From anbumani923 at gmail.com  Tue Sep 13 00:12:39 2011
From: anbumani923 at gmail.com (anbu)
Date: Mon, 12 Sep 2011 21:12:39 -0700 (PDT)
Subject: WANTED FRESHER IT,CSC,CIVIL,MECH
Message-ID: <d5550f6e-b839-4330-8889-2e04a59dc18f@e34g2000pri.googlegroups.com>

 http://123maza.com/65/cute540/


From sillyousu at gmail.com  Tue Sep 13 00:20:54 2011
From: sillyousu at gmail.com (sillyou su)
Date: Mon, 12 Sep 2011 21:20:54 -0700 (PDT)
Subject: =?UTF-8?Q?Should_a_beginner_do_some_coding_excises=3F_How_can_I_?=
	=?UTF-8?Q?find_the_sources=EF=BC=9F?=
Message-ID: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>

I'm reading "Learning Python"? Chinese version?. Before I go through
the whole book, I want to do some excises matching each charter.
Any tips? Any better advice?



From amitatgroups at gmail.com  Tue Sep 13 00:26:48 2011
From: amitatgroups at gmail.com (Amit Jain)
Date: Mon, 12 Sep 2011 21:26:48 -0700 (PDT)
Subject: Default Admin user on weblogic domain deleted after executing create
	command using WLST
Message-ID: <a718be0f-824a-47a0-9829-7bb34498f5c8@m4g2000pri.googlegroups.com>

Hello All,

we observed that user exactly deleted when 'create' cmd is executed:
filestore = create("wlstProperties.getProperty(fileStoreName)",
"FileStore")
jmsServer = create("AUAJMSServer", "JMSServer")
...
..
etc.

http://groups.google.com/group/comp.lang.java.programmer/browse_thread/thread/1927322accdb6e6e/223e1c7cd208a86c

Please suggestion...

regards, Amit J.


From jabba.laci at gmail.com  Tue Sep 13 00:33:22 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Tue, 13 Sep 2011 00:33:22 -0400
Subject: update all python packages on Debian/Ubuntu
Message-ID: <CAOuJsMnwWs6z1escn7NB=o+R16s1+BDxPrcA=MQVQ3HnjnvZiQ@mail.gmail.com>

Hi,

I use Ubuntu and the Python packages on my system were either
installed with (1) apt-get, or with (2) pip. Since the number of
python packages in the Ubuntu repositories is limited, I had to
install several packages with pip.

Now I want to upgrade the packages that were installed with pip (and
only those packages).

I can collect the list of python packages:
(pip freeze | cut -d = -f 1 | grep -v FIXME | xargs echo | tr ' ' '\n'
>list.txt) 2>/dev/null

However, if I update every package in list.txt with "pip install -U",
it will also update the ones that were installed with apt-get. Since
apt-get builds a database with the installed files, I'm sure it won't
like that pip replaces those files. I didn't try it yet but I'm afraid
it would mess up the system.

So, how to upgrade the python packages correctly?

Thanks,

Laszlo


From memilanuk at gmail.com  Tue Sep 13 01:14:02 2011
From: memilanuk at gmail.com (memilanuk)
Date: Mon, 12 Sep 2011 22:14:02 -0700
Subject: =?UTF-8?B?UmU6IFNob3VsZCBhIGJlZ2lubmVyIGRvIHNvbWUgY29kaW5nIGV4Y2k=?=
	=?UTF-8?B?c2VzPyBIb3cgY2FuIEkgZmluZCB0aGUgc291cmNlc++8nw==?=
In-Reply-To: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>
References: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>
Message-ID: <j4moqv$saf$1@dough.gmane.org>

On 09/12/2011 09:20 PM, sillyou su wrote:
> I'm reading "Learning Python"? Chinese version?. Before I go through
> the whole book, I want to do some excises matching each charter.
> Any tips? Any better advice?
>


For the code examples, have you tried looking up the home page for the 
book?  Google for 'oreilly learning python' and find the correct edition 
that you have.

If its the 4th ed (current), you should end up on a page like this:

http://shop.oreilly.com/product/9780596158071.do

Down in the right hand side-bar, there should be a menu 'Essential 
Links' and one of the options is 'Download code' or something along 
those lines.  The link should take you to a zip file with all the code 
examples in the book.

As far as practice exercises... maybe something like 
codingbat.com/python would be helpful.  Its not related to the book at 
all, and doesn't go nearly as in depth... but its kind of neat to play 
with and see how your code works when someone else is grading it! (at 
least for me).

HTH,

Monte



From data.2 at rediff.com  Tue Sep 13 01:24:49 2011
From: data.2 at rediff.com (gaurav)
Date: Mon, 12 Sep 2011 22:24:49 -0700 (PDT)
Subject: Get careers in Management work.
Message-ID: <5fd4f6a9-8404-4bda-a484-12bba1aefdc2@z26g2000pre.googlegroups.com>

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From wuwei23 at gmail.com  Tue Sep 13 02:56:30 2011
From: wuwei23 at gmail.com (alex23)
Date: Mon, 12 Sep 2011 23:56:30 -0700 (PDT)
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <775ad552-1452-4b32-bf93-024c6d3761ea@u6g2000prc.googlegroups.com>

On Sep 10, 1:54 pm, "Littlefield, Tyler" <ty... at tysdomain.com> wrote:
> I'm not feeling particularly masochistic, so I do not want to develop
> this project in PHP; essentially I'm looking to build a web-based MMO.

Google have been promoting the use of appengine along with HTML5 & JS
to produce games. One advantage of using GAE to host the server is it
takes care of the scaling for you.

I found these presentations fascinating:
http://cc-2011-html5-games.appspot.com/#1
http://io-2011-html5-games-hr.appspot.com/#1

This article covers the process in a little more depth:
http://clouddbs.blogspot.com/2011/02/how-to-write-html5-game-in-30-days-with.html

Google are also aggregating platform-specific info here:
http://code.google.com/games

Hope this helps (and let us know when you have something to show off!)


From j.reid at mail.cryst.bbk.ac.uk  Tue Sep 13 03:30:42 2011
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Tue, 13 Sep 2011 08:30:42 +0100
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <1ksbq.2549$ex3.1130@newsfe30.ams2>
References: <mailman.1034.1315836239.27778.python-list@python.org>
	<1ksbq.2549$ex3.1130@newsfe30.ams2>
Message-ID: <j4n0r3$cda$1@dough.gmane.org>

On 12/09/11 19:37, Stefaan Himpe wrote:
> The simplest one to learn is web2py http://www.web2py.com
> No configuration needed, just unpack and get started.
> It also has very good documentation and tons of little examples to get
> things done.
>
> The other options you mentioned are good too :)
>

OK I've had a look at bottle, cherrypy and web2py and they look fairly 
straightforward. I'll check out some more and see where I get to. Thanks 
for the tips,
John.



From limodou at gmail.com  Tue Sep 13 03:45:35 2011
From: limodou at gmail.com (limodou)
Date: Tue, 13 Sep 2011 15:45:35 +0800
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <j4n0r3$cda$1@dough.gmane.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
	<1ksbq.2549$ex3.1130@newsfe30.ams2> <j4n0r3$cda$1@dough.gmane.org>
Message-ID: <CADCtg99xhMhjsoJwjqz19+oEr64O3R6y607O8VAiKBmBFadn5A@mail.gmail.com>

On Tue, Sep 13, 2011 at 3:30 PM, John Reid <j.reid at mail.cryst.bbk.ac.uk> wrote:
> On 12/09/11 19:37, Stefaan Himpe wrote:
>>
>> The simplest one to learn is web2py http://www.web2py.com
>> No configuration needed, just unpack and get started.
>> It also has very good documentation and tons of little examples to get
>> things done.
>>
>> The other options you mentioned are good too :)
>>
>
> OK I've had a look at bottle, cherrypy and web2py and they look fairly
> straightforward. I'll check out some more and see where I get to. Thanks for
> the tips,
> John.
>

maybe you can also try out uliweb.

-- 
I like python!
UliPad <<The Python Editor>>: http://code.google.com/p/ulipad/
UliWeb <<simple web framework>>: http://code.google.com/p/uliweb/
My Blog: http://hi.baidu.com/limodou


From wxjmfauth at gmail.com  Tue Sep 13 03:49:17 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 13 Sep 2011 00:49:17 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
	<op.v1ps4fqia8ncjz@gnudebst>
Message-ID: <44bd982b-e740-4c77-974e-aa8c9eb47d6e@y4g2000vbx.googlegroups.com>

On 12 sep, 23:39, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:


> Now read what Steven wrote again. ?The issue is that the program contains ?
> characters that are syntactically illegal. ?The "engine" can be perfectly ?
> correctly translating a character as a smart quote or a non breaking space ?
> or an e-umlaut or whatever, but that doesn't make the character legal!
>

Yes, you are right. I did not understand in that way.

However, a small correction/precision. Illegal character
do not exit. One can "only" have an ill-formed encoded code
points or an illegal encoded code point representing a
character/glyph.

Basically, in the present case. The issue is most probably
a mismatch between the coding directive and the real
coding, with "no coding directive" == 'ascii'.


jmf


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From steve+comp.lang.python at pearwood.info  Tue Sep 13 04:15:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 13 Sep 2011 18:15:39 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
	<op.v1ps4fqia8ncjz@gnudebst>
	<44bd982b-e740-4c77-974e-aa8c9eb47d6e@y4g2000vbx.googlegroups.com>
Message-ID: <4e6f112c$0$29997$c3e8da3$5496439d@news.astraweb.com>

On Tue, 13 Sep 2011 05:49 pm jmfauth wrote:

> On 12 sep, 23:39, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> 
> 
>> Now read what Steven wrote again. ?The issue is that the program contains
>> characters that are syntactically illegal. ?The "engine" can be perfectly
>> correctly translating a character as a smart quote or a non breaking
>> space or an e-umlaut or whatever, but that doesn't make the character
>> legal!
>>
> 
> Yes, you are right. I did not understand in that way.
> 
> However, a small correction/precision. Illegal character
> do not exit. One can "only" have an ill-formed encoded code
> points or an illegal encoded code point representing a
> character/glyph.

You are wrong there. There are many ASCII characters which are illegal in
Python source code, at least outside of comments and string literals, and
possibly even there.

>>> code = "x = 1 + \b 2"  # all ASCII characters
>>> print(code)
x = 1 + 2
>>> exec(code)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1
    x = 1 + 2
            ^
SyntaxError: invalid syntax


Now, imagine that somehow a \b ASCII backspace character somehow gets
introduced into your source file. When you go to run the file, or import
it, you will get a SyntaxError. Changing the encoding will not help.



-- 
Steven



From wxjmfauth at gmail.com  Tue Sep 13 05:04:09 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 13 Sep 2011 02:04:09 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
	<op.v1ps4fqia8ncjz@gnudebst>
	<44bd982b-e740-4c77-974e-aa8c9eb47d6e@y4g2000vbx.googlegroups.com>
	<4e6f112c$0$29997$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4a674dba-078b-4353-a6ae-01c205460e91@w12g2000yqa.googlegroups.com>

On 13 sep, 10:15, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:

The intrinsic coding of the characters is one thing,
The usage of bytes stream supposed to represent a text
is one another thing,

jmf


From sillyousu at gmail.com  Tue Sep 13 06:31:06 2011
From: sillyousu at gmail.com (sillyou su)
Date: Tue, 13 Sep 2011 03:31:06 -0700 (PDT)
Subject: =?UTF-8?Q?Re=3A_Should_a_beginner_do_some_coding_excises=3F_How_ca?=
	=?UTF-8?Q?n_I_find_the_sources=EF=BC=9F?=
References: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>
	<mailman.1059.1315890862.27778.python-list@python.org>
Message-ID: <1ef0994b-e274-420d-8889-e26556cc7b84@h32g2000prl.googlegroups.com>

On Sep 13, 1:14?pm, memilanuk <memila... at gmail.com> wrote:
> On 09/12/2011 09:20 PM, sillyou su wrote:
>
> > I'm reading "Learning Python"? Chinese version?. Before I go through
> > the whole book, I want to do some excises matching each charter.
> > Any tips? Any better advice?
>
> For the code examples, have you tried looking up the home page for the
> book? ?Google for 'oreilly learning python' and find the correct edition
> that you have.
>
> If its the 4th ed (current), you should end up on a page like this:
>
> http://shop.oreilly.com/product/9780596158071.do
>
> Down in the right hand side-bar, there should be a menu 'Essential
> Links' and one of the options is 'Download code' or something along
> those lines. ?The link should take you to a zip file with all the code
> examples in the book.
>
> As far as practice exercises... maybe something like
> codingbat.com/python would be helpful. ?Its not related to the book at
> all, and doesn't go nearly as in depth... but its kind of neat to play
> with and see how your code works when someone else is grading it! (at
> least for me).
>
> HTH,
>
> Monte

codingbat.com/python!
The website is really interesting.
Thank you!


From 1248283536 at qq.com  Tue Sep 13 07:14:15 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 13 Sep 2011 19:14:15 +0800
Subject: problem:import  csv  data 
Message-ID: <tencent_727B2E693BE1A5F92159BCAB@qq.com>

import sqlite3 
con = sqlite3.connect('/home/stock.db')
cur = con.cursor()
cur.execute('''CREATE TABLE quote (ticker TEXT,date TEXT, popen TEXT, high TEXT, low TEXT,vol TEXT,adjclose TEXT);''')
i=/tmp/data.csv
cur.execute('.separator "," ')
cur.execute('.import  %s  quote'  %  i)
con.commit()
cur.close()
con.close()

the output is :
    cur.execute('.separator"," ')
sqlite3.OperationalError: near ".": syntax error

how to fix it?
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From alexander_naumov at opensuse.org  Tue Sep 13 08:21:03 2011
From: alexander_naumov at opensuse.org (Alex Naumov)
Date: Tue, 13 Sep 2011 14:21:03 +0200
Subject: send string to input of another process
Message-ID: <CABPy6+zG_PBzgQFxq2CCRY556nGg_xPwSVyeCNpRjn+mtKM3Gw@mail.gmail.com>

Hello everybody,

I'm looking for some solution, maybe someone of you can help me.

I call another process via os.system("process") and it waits for some input.
I have to write a comment (for example, like using svn or git), and after
that to close input (for example, like ":wq" using vim).
How can I give/write this comment and put it in the input for next process
(which start after)?


Thanks a lot for your time and help.
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From mimohammedimran41 at gmail.com  Tue Sep 13 08:29:37 2011
From: mimohammedimran41 at gmail.com (mohammed imran)
Date: Tue, 13 Sep 2011 05:29:37 -0700 (PDT)
Subject: mohammedimran
Message-ID: <e0d6d61a-c2dd-423a-8c63-520af4ff61dc@z26g2000pre.googlegroups.com>

http://123maza.com/65/fun564/


From vacorama at gmail.com  Tue Sep 13 08:31:59 2011
From: vacorama at gmail.com (ron)
Date: Tue, 13 Sep 2011 05:31:59 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>

On Sep 12, 4:49?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> On Mon, 12 Sep 2011 06:43 pm Stefan Behnel wrote:
>
> > I'm not sure what you are trying to say with the above code, but if it's
> > the code that fails for you with the exception you posted, I would guess
> > that the problem is in the "[more stuff here]" part, which likely contains
> > a non-ASCII character. Note that you didn't declare the source file
> > encoding above. Do as Gary told you.
>
> Even with a source code encoding, you will probably have problems with
> source files including \xe2 and other "bad" chars. Unless they happen to
> fall inside a quoted string literal, I would expect to get a SyntaxError.
>
> I have come across this myself. While I haven't really investigated in great
> detail, it appears to happen when copying and pasting code from a document
> (usually HTML) which uses non-breaking spaces instead of \x20 space
> characters. All it takes is just one to screw things up.
>
> --
> Steven

Depending on the load, you can do something like:

"".join([x for x in string if ord(x) < 128])

It's worked great for me in cleaning input on webapps where there's a
lot of copy/paste from varied sources.


From miki.tebeka at gmail.com  Tue Sep 13 09:09:59 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Tue, 13 Sep 2011 06:09:59 -0700 (PDT)
Subject: problem:import  csv  data
In-Reply-To: <mailman.1069.1315912709.27778.python-list@python.org>
References: <mailman.1069.1315912709.27778.python-list@python.org>
Message-ID: <40eaa387-16b1-4100-8998-38e90a9f615e@glegroupsg2000goo.googlegroups.com>

.separator (and .import) are not SQL commands but "sqlite3" commands.
You can get the same effect with the following code:

    with open('/tmp/data.csv') as fo:
        reader = csv.reader(fo)
        cur.executemany('INSERT INTO quote VALUES (?, ?, ?, ?, ?, ?, ?)'), reader)

HTH
--
Miki Tebeka <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From miki.tebeka at gmail.com  Tue Sep 13 09:09:59 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Tue, 13 Sep 2011 06:09:59 -0700 (PDT)
Subject: problem:import  csv  data
In-Reply-To: <mailman.1069.1315912709.27778.python-list@python.org>
References: <mailman.1069.1315912709.27778.python-list@python.org>
Message-ID: <40eaa387-16b1-4100-8998-38e90a9f615e@glegroupsg2000goo.googlegroups.com>

.separator (and .import) are not SQL commands but "sqlite3" commands.
You can get the same effect with the following code:

    with open('/tmp/data.csv') as fo:
        reader = csv.reader(fo)
        cur.executemany('INSERT INTO quote VALUES (?, ?, ?, ?, ?, ?, ?)'), reader)

HTH
--
Miki Tebeka <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From manodec25 at gmail.com  Tue Sep 13 09:22:16 2011
From: manodec25 at gmail.com (mano mano)
Date: Tue, 13 Sep 2011 06:22:16 -0700 (PDT)
Subject: The Usenet newsgroup news:comp.lang.python ...
Message-ID: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>

Mikael Lyngvig accurately summarizes comp.lang.python discussion of
the technical merits of Tkinter, wxPython, and Python-bound JPI.
Malcolm Tredinnick ...............

http://123maza.com/48/doll789/


From pavlovevidence at gmail.com  Tue Sep 13 09:31:52 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 13 Sep 2011 06:31:52 -0700 (PDT)
Subject: PC locks up with list operations
In-Reply-To: <mailman.600.1314795040.27778.python-list@python.org>
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<4E5E2BCB.5090903@simplistix.co.uk>
	<mailman.600.1314795040.27778.python-list@python.org>
Message-ID: <7ae217be-3069-404a-8fcc-e45f4187f30c@glegroupsg2000goo.googlegroups.com>

On Wednesday, August 31, 2011 5:49:24 AM UTC-7, Benjamin Kaplan wrote:
> 32-bit or 64-bit Python? A 32-bit program will crash once memory hits
> 2GB. A 64-bit program will just keep consuming RAM until your computer
> starts thrashing. The problem isn't your program using more RAM than
> you have, just more RAM than you have free. Last time I faced a
> situation like this, I just decided it was better to stick to the
> 32-bit program and let it crash if it got too big.

On my 64-bit Linux system, I got a memory error in under a second, no thrashing.

I have no swap.  It's overrated.


Carl Banks


From vlastimil.brom at gmail.com  Tue Sep 13 09:33:00 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 13 Sep 2011 15:33:00 +0200
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
Message-ID: <CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>

2011/9/13 ron <vacorama at gmail.com>:
>
> Depending on the load, you can do something like:
>
> "".join([x for x in string if ord(x) < 128])
>
> It's worked great for me in cleaning input on webapps where there's a
> lot of copy/paste from varied sources.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Well, for this kind of dirty "data cleaning" you may as well use e.g.

>>> u"?te?xt ??? wi????th??? ??no????n AS???C?????I?????I?? i???n ??bet????wee???n .??..?".encode("ascii", "ignore").decode("ascii")
u'text  with non ASCII in between ...'
>>>

vbr


From jon at jaggersoft.com  Tue Sep 13 09:34:56 2011
From: jon at jaggersoft.com (Jon Jagger)
Date: Tue, 13 Sep 2011 06:34:56 -0700 (PDT)
Subject: ACCU conference call for proposals
Message-ID: <e86dcb76-29a4-4c7e-b803-c77356bab643@n35g2000yqf.googlegroups.com>


ACCU is a non-profit organisation run by software enthusiasts for
software enthusiasts.

ACCU warmly invites you to propose a session for this leading software
development conference.

Call for Proposals - ACCU 2012
April 24-28, 2012. Barcelo Oxford Hotel, Oxford, UK
Submission website: https://www.conftool.pro/accu2012/
Submission deadline: 16th of October 2011
twitter: @accu2012 #accu2012

More details can be found here
http://accu.org/index.php/conferences/accu_conference_2012/accu2012_Call_for_Papers

The conference has always benefited from the strength of its
programme. Please help us make 2012 another successful event.

Jon Jagger
Conference Chair


From kushal.kumaran+python at gmail.com  Tue Sep 13 10:01:41 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Tue, 13 Sep 2011 19:31:41 +0530
Subject: send string to input of another process
In-Reply-To: <CABPy6+zG_PBzgQFxq2CCRY556nGg_xPwSVyeCNpRjn+mtKM3Gw@mail.gmail.com>
References: <CABPy6+zG_PBzgQFxq2CCRY556nGg_xPwSVyeCNpRjn+mtKM3Gw@mail.gmail.com>
Message-ID: <CAH8GtdMooPje6p3rdr0B2PRYsoumJa7VV=j2DW1-h9ymnrh8jg@mail.gmail.com>

On 13 Sep 2011 17:53, "Alex Naumov" <alexander_naumov at opensuse.org> wrote:
>
> Hello everybody,
>
> I'm looking for some solution, maybe someone of you can help me.
>
> I call another process via os.system("process") and it waits for some
input. I have to write a comment (for example, like using svn or git), and
after that to close input (for example, like ":wq" using vim).
> How can I give/write this comment and put it in the input for next process
(which start after)?
>
>

Take a look at the subprocess module, especially the communicate method.
Note that you will not be able to script screen-oriented programs like vim
using this, unless it has some mode where you can drive it by piping
commands on stdin.

If you want to provide commit messages, I'm sure your vc system accepts
those on the command line instead.

-- 
regards,
kushal
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From saranyamathaiyan at gmail.com  Tue Sep 13 10:52:13 2011
From: saranyamathaiyan at gmail.com (saranya saran)
Date: Tue, 13 Sep 2011 07:52:13 -0700 (PDT)
Subject: HI YOU WILL GET EARN MORE MONEY
Message-ID: <c685858e-dc2e-4827-bbea-b4c0c4b1be55@e34g2000pri.googlegroups.com>

open this webpage you will get more ideas


Webpages: http://123maza.com/65/tiger205/


From alec.taylor6 at gmail.com  Tue Sep 13 11:02:05 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 14 Sep 2011 01:02:05 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
	<CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
Message-ID: <CAO+9iGfMToWvMOyha__DnAH=S-uaDS6wZEk+uFrH15seuO7ynQ@mail.gmail.com>

Hmm, nothing mentioned so far works for me...

Here's a very small test case:

>>> python -u "Convert to Creole.py"
  File "Convert to Creole.py", line 1
SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
on line 1, but no encoding declared; see
http://www.python.org/peps/pep-0263.html for details
>>> Exit Code: 1

Line 1: a=u'''?'''.encode("ascii", "ignore").decode("ascii")

On Tue, Sep 13, 2011 at 11:33 PM, Vlastimil Brom
<vlastimil.brom at gmail.com> wrote:
> 2011/9/13 ron <vacorama at gmail.com>:
>>
>> Depending on the load, you can do something like:
>>
>> "".join([x for x in string if ord(x) < 128])
>>
>> It's worked great for me in cleaning input on webapps where there's a
>> lot of copy/paste from varied sources.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> Well, for this kind of dirty "data cleaning" you may as well use e.g.
>
>>>> u"?te?xt ??? wi????th??? ??no????n AS???C?????I?????I?? i???n ??bet????wee???n .??..?".encode("ascii", "ignore").decode("ascii")
> u'text ?with non ASCII in between ...'
>>>>
>
> vbr
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From jpiitula at ling.helsinki.fi  Tue Sep 13 11:29:03 2011
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 13 Sep 2011 18:29:03 +0300
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
	<CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
	<mailman.1074.1315926128.27778.python-list@python.org>
Message-ID: <qotty8gwjeo.fsf@ruuvi.it.helsinki.fi>

Alec Taylor writes:

> Hmm, nothing mentioned so far works for me...
> 
> Here's a very small test case:
> 
> >>> python -u "Convert to Creole.py"
>   File "Convert to Creole.py", line 1
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 1, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details
> >>> Exit Code: 1
> 
> Line 1: a=u'''?'''.encode("ascii", "ignore").decode("ascii")

The people who told you to declare the source code encoding in the
source file would like to see Line 0.

See <http://www.python.org/peps/pep-0263.html>.

[1001] ruuvi$ cat ctc.py
# coding=utf-8
print u'''x ? 1'''.encode("ascii", "ignore").decode("ascii")
[1002] ruuvi$ python ctc.py
x  1
[1003] ruuvi$ 


From ian.g.kelly at gmail.com  Tue Sep 13 11:45:03 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Tue, 13 Sep 2011 09:45:03 -0600
Subject: PyWart: Itertools module needs attention
In-Reply-To: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
Message-ID: <CALwzid=s8zNLL+L9zDRGSSwicL7pvppcC858wV+VpPpHbc_csQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 4:04 PM, rantingrick <rantingrick at gmail.com> wrote:
>
> ############################################################
> # ? ? ? ? ? ? ? ? ? ? ? ? ?Quote ? ? ? ? ? ? ? ? ? ? ? ? ? #
> ############################################################
> # The itertools module is great HOWEVER i believe most ? ? #
> # people are recreating the functionalities due to the ? ? #
> # insanely cryptic and/or missing examples from each ? ? ? #
> # method ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? #
> ############################################################

Have you looked at the online itertools documentation at all?

http://docs.python.org/library/itertools.html

> py> ''.join(list(itertools.dropwhile(lambda x:x==" ", " ? ?hello
> word ? ?")))
> 'hello word ? ?'
> py> ''.join(list(itertools.takewhile(lambda x:x==" ", " ? ?hello
> word ? ?")))
> ' ? ?'

These are too complex to be good examples.  Drop the lambda and
replace it with a built-in.  Also, str.join is perfectly capable of
taking an iterator as its argument.  There is no reason at all to
construct a list first.

> py> print itertools.compress.__doc__
> compress(data, selectors) --> iterator over selected data
> Return data elements corresponding to true selector elements.
> Forms a shorter iterator from selected data elements using the
> selectors to choose the data elements.
>
> ############################################################
> # ? ? ? ? ? ? ? ? ? ? ? ? ?Quote ? ? ? ? ? ? ? ? ? ? ? ? ? #
> ############################################################
> # WTF! Would you like to define a Python "selector". Could #
> # it be that we should be using "selector function" or ? ? #
> # "predicate function" instead? ? ? ? ? ? ? ? ? ? ? ? ? ? ?#
> ############################################################

Notice that it says "selector elements", not "selector functions".
You have misconstrued what this function does.  Hint: it does not use
predicates at all.

I can agree though that this could probably use a simple example in
the doc string.


From ramit.prasad at jpmorgan.com  Tue Sep 13 12:24:10 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 12:24:10 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>

Written by Kayode Odeyemi
Well, I did try using super(), but I got this:
>>> class B(A):
...     def __init__(self, module):
...             super(A, self).log('system')
...
>>> c = B('module')
=================================================
You should be passed super the current class you want the super class of, not the type of the super class. So it should be:
super(B, self).log('system') # Notice that it passed class B


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423





This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  
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From davea at ieee.org  Tue Sep 13 12:37:11 2011
From: davea at ieee.org (Dave Angel)
Date: Tue, 13 Sep 2011 12:37:11 -0400
Subject: The Usenet newsgroup news:comp.lang.python ...
In-Reply-To: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
Message-ID: <4E6F86B7.8080601@ieee.org>

On 01/-10/-28163 02:59 PM, mano mano wrote:
> Mikael Lyngvig accurately summarizes comp.lang.python discussion of
> the technical merits of Tkinter, wxPython, and Python-bound JPI.
> Malcolm Tredinnick ...............
>
> http://12......89/
>
SPAM ALERT



From ramit.prasad at jpmorgan.com  Tue Sep 13 12:46:08 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 12:46:08 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>

>You should be passed super the current class you want the super class of, not the type of the super class. So it should be:
>super(B, self).log('system') # Notice that it passed class B

Ugh, apologies for the poor English; my tea has not kicked in.

That first line would be more understandable as:  'You should pass the current class (B) you want the super class of, not the type of the super class (A) itself. So it should be:'

To clarify, by passing A to super it retrieves the definition for the base class (object) which does not have the function you are trying to access.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  
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From dreyemi at gmail.com  Tue Sep 13 12:56:55 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 13 Sep 2011 17:56:55 +0100
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>

On Tue, Sep 13, 2011 at 5:46 PM, Prasad, Ramit <ramit.prasad at jpmorgan.com>wrote:

> >You should be passed super the current class you want the super class of,
> not the type of the super class. So it should be:****
>
> >super(*B*, self).log('system') # Notice that it passed class B****
>
> ** **
>
> Ugh, apologies for the poor English; my tea has not kicked in.****
>
> ** **
>
> That first line would be more understandable as:  ?You should pass the
> current class (B) you want the super class of, not the type of the super
> class (A) itself. So it should be:?****
>
> ** **
>
> To clarify, by passing A to super it retrieves the definition for the base
> class (object) which does not have the function you are trying to access.*
> ***
>
> ** **
>
> Ramit
>

Thanks for helping me clarify on how to use super() in Py2+. That really
worked!

>>> class B(A):
...     def __init__(self, module):
...             self.module = A.log(self, module)
...             print self.module # printing here is completely unnecessary
in a good OOP language
...
>>> c = B('system')
logged
>>> class B(A):
...     def __init__(self, module):
...             print super(B, self).log('system') # printing here is
completely unnecessary in a good OOP language
...
>>> c = B('system')
logged
>>>

When an instance of a class is created, all codes within that instance block
should be executed. That's my understanding of OOP.

Thanks everyone!


> ****
>
> ** **
>
> ** **
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology****
>
> 712 Main Street | Houston, TX 77002****
>
> work phone: 713 - 216 - 5423****
>
> ****
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of securities,
> accuracy and completeness of information, viruses, confidentiality, legal
> privilege, and legal entity disclaimers, available at
> http://www.jpmorgan.com/pages/disclosures/email.
>



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From ian.g.kelly at gmail.com  Tue Sep 13 13:24:34 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Tue, 13 Sep 2011 11:24:34 -0600
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
	<CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
Message-ID: <CALwzidkyA-B8_Z4=CpK0miyusn+jTiEKjCvrg0AtoZK-trHZKQ@mail.gmail.com>

On Tue, Sep 13, 2011 at 10:56 AM, Kayode Odeyemi <dreyemi at gmail.com> wrote:
>>>> class B(A):
> ... ? ? def __init__(self, module):
> ... ? ? ? ? ? ? self.module = A.log(self, module)
> ... ? ? ? ? ? ? print self.module # printing here is completely unnecessary
> in a good OOP language
> ...
>>>> c = B('system')
> logged
>>>> class B(A):
> ... ? ? def __init__(self, module):
> ... ? ? ? ? ? ? print super(B, self).log('system')?# printing here is
> completely unnecessary in a good OOP language
> ...
>>>> c = B('system')
> logged
>>>>
> When an instance of a class is created, all codes within that instance block
> should be executed. That's my understanding of OOP.

The initializer should be executed, which is what Python does.  Your
initializer then calls A.log, which does nothing interesting at all.

My question is, what exactly is it that you intend A.log to do?  As
written, it does not do any logging.  It merely constructs a string
and then returns it.  Neither constructing a string, nor returning a
string, imply logging it or printing it.


From vlastimil.brom at gmail.com  Tue Sep 13 14:13:44 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 13 Sep 2011 20:13:44 +0200
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGfMToWvMOyha__DnAH=S-uaDS6wZEk+uFrH15seuO7ynQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
	<CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
	<CAO+9iGfMToWvMOyha__DnAH=S-uaDS6wZEk+uFrH15seuO7ynQ@mail.gmail.com>
Message-ID: <CAHzaPENCfsL-Kk5UCQDqRjOuOTRoZRGtuAP6nPKAcE8ONchokQ@mail.gmail.com>

2011/9/13 Alec Taylor <alec.taylor6 at gmail.com>:
> Hmm, nothing mentioned so far works for me...
>
> Here's a very small test case:
>
>>>> python -u "Convert to Creole.py"
> ?File "Convert to Creole.py", line 1
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 1, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details
>>>> Exit Code: 1
>
> Line 1: a=u'''?'''.encode("ascii", "ignore").decode("ascii")
>
> On Tue, Sep 13, 2011 at 11:33 PM, Vlastimil Brom
> <vlastimil.brom at gmail.com> wrote:
>> 2011/9/13 ron <vacorama at gmail.com>:
>>>
>>> Depending on the load, you can do something like:
>>>
>>> "".join([x for x in string if ord(x) < 128])
>>>
>>> It's worked great for me in cleaning input on webapps where there's a
>>> lot of copy/paste from varied sources.
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>> Well, for this kind of dirty "data cleaning" you may as well use e.g.
>>
>>>>> u"?te?xt ??? wi????th??? ??no????n AS???C?????I?????I?? i???n ??bet????wee???n .??..?".encode("ascii", "ignore").decode("ascii")
>> u'text ?with non ASCII in between ...'
>>>>>
>>
>> vbr
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>

Ok, in that case the encoding probably would be utf-8; \xe2 is just
the first part of the encoded data

>>> u'?'.encode("utf-8")
'\xe2\x89\xa4'
>>>

Setting this encoding at the beginning of the file, as mentioned
before, might solve the problem while retaining the symbol in question
(or you could move from syntax error to some unicode related error
depending on other circumstances...).

vbr


From davea at ieee.org  Tue Sep 13 15:31:08 2011
From: davea at ieee.org (Dave Angel)
Date: Tue, 13 Sep 2011 15:31:08 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>	<4E6C9044.5060302@jollybox.de>	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
	<CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
Message-ID: <4E6FAF7C.40406@ieee.org>

On 01/-10/-28163 02:59 PM, Kayode Odeyemi wrote:
>
> When an instance of a class is created, all codes within that instance block
> should be executed. That's my understanding of OOP.
>
I don't understand this phrasing at all.   Could you show a specific 
example of something that does not execute code you think should be 
executed?  I suspect you're just confused by things the interactive 
session is printing out, which are not part of the language, and work a 
bit differently.

DaveA



From dreyemi at gmail.com  Tue Sep 13 15:53:18 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 13 Sep 2011 20:53:18 +0100
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <4E6FAF7C.40406@ieee.org>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
	<CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
	<4E6FAF7C.40406@ieee.org>
Message-ID: <CAPbrmCuaHmVhRLncjGFk8v0vWQa9bW8K9DdvTRQsEPKze-vZrw@mail.gmail.com>

On Tue, Sep 13, 2011 at 8:31 PM, Dave Angel <davea at ieee.org> wrote:

> I suspect you're just confused by things the interactive session is
> printing out, which are not part of the language, and work a bit
> differently.


You are right. This is where I missed it. The command interface requires a
print command, as against using a return statement.

My apologies.



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From arnodel at gmail.com  Tue Sep 13 16:20:16 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 13 Sep 2011 21:20:16 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
Message-ID: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>

Hi all,

Unpyc3 can recreate Python3 source code from code objects, function
source code from function objects, and module source code from .pyc
files. The current version is able to decompile itself successfully
:). It has been tested with Python3.2 only.

It currently reconstructs most of Python 3 (see TODO below) constructs
but probably needs to be tested more thoroughly. All feedback welcome.

Unpyc3 is a single file and is available at http://code.google.com/p/unpyc3/

Example:

>>> from unpyc3 import decompile
>>> def foo(x, y, z=3, *args):
...    global g
...    for i, j in zip(x, y):
...        if z == i + j or args[i] == j:
...            g = i, j
...            return
...
>>> print(decompile(foo))
def foo(x, y, z=3, *args):
    global g
    for i, j in zip(x, y):
        if z == i + j or args[i] == j:
            g = i, j
            return

TODO:

* Support for keyword-only arguments
* Handle assert statements
* Show docstrings for functions and modules
* Nice spacing between function/class declarations

Have fun!

Note: unpyc3 is totally unrelated to another project called "unpyc"
which I discovered when I tried to register the same project name on
google code.

-- 
Arnaud


From tjhanson at yahoo.com  Tue Sep 13 16:25:06 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 13:25:06 -0700
Subject: Need some experience
Message-ID: <201109131325.06524.tjhanson@yahoo.com>

I have been a desktop Linux user for better than eleven years, as a hobby.  
Back when we still did most of our computing on desktops I even set up a 
rudimentary server setup in my home.  Nothing fancy or anything, but I was 
proud of it and of the fact that it was built Microsoft free.  I have no 
formal education in IT nor programming.  Retired now, my career was finance; I 
was an IRS field agent.

Since retiring two years ago, I have renewed my interest in software.  I know 
some C and lately decided to learn Python.  I have worked through a couple of 
the introductory texts and have a feeling for the OOP model, although I won't 
be able to  call myself an experienced practitioner anytime soon.

I am looking for an open source project that will allow me to develop my 
skills further.

Financially, I'm set; I'm not looking for a job.  I'm looking for some drudge 
work, where I can look at other peoples' code and make a contribution.  
Naturally I do not want to do this forever; I'm hoping to get up to speed with 
my skill set so I can work to more complexity later.

Does anyone have some ideas that would help me?


From t at jollybox.de  Tue Sep 13 16:37:05 2011
From: t at jollybox.de (Thomas Jollans)
Date: Tue, 13 Sep 2011 22:37:05 +0200
Subject: Need some experience
In-Reply-To: <201109131325.06524.tjhanson@yahoo.com>
References: <201109131325.06524.tjhanson@yahoo.com>
Message-ID: <4E6FBEF1.5020404@jollybox.de>

On 13/09/11 22:25, Tim Hanson wrote:
> I have been a desktop Linux user for better than eleven years, as a hobby.  
> Back when we still did most of our computing on desktops I even set up a 
> rudimentary server setup in my home.  Nothing fancy or anything, but I was 
> proud of it and of the fact that it was built Microsoft free.  I have no 
> formal education in IT nor programming.  Retired now, my career was finance; I 
> was an IRS field agent.
> 
> Since retiring two years ago, I have renewed my interest in software.  I know 
> some C and lately decided to learn Python.  I have worked through a couple of 
> the introductory texts and have a feeling for the OOP model, although I won't 
> be able to  call myself an experienced practitioner anytime soon.
> 
> I am looking for an open source project that will allow me to develop my 
> skills further.
> 
> Financially, I'm set; I'm not looking for a job.  I'm looking for some drudge 
> work, where I can look at other peoples' code and make a contribution.  
> Naturally I do not want to do this forever; I'm hoping to get up to speed with 
> my skill set so I can work to more complexity later.
> 
> Does anyone have some ideas that would help me?

This is becoming something of an FAQ - I don't suppose there's a canned
response link somewhere ? ;-)

I like to recommend CPython itself ? which is a bit hypocritical, as I
haven't touched it in quite a while. It has a constantly overflowing bug
tracker where I'm sure you can find a lot of fascinating problems that
need solving. The community, I have found, is welcoming and friendly.
Much of the standard library is written in Python, but if you know C,
you can have a go at the C code as well.

Thomas


From tjhanson at yahoo.com  Tue Sep 13 16:52:24 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 13:52:24 -0700
Subject: Need some experience
In-Reply-To: <4E6FBEF1.5020404@jollybox.de>
References: <201109131325.06524.tjhanson@yahoo.com>
	<4E6FBEF1.5020404@jollybox.de>
Message-ID: <201109131352.25059.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 01:37:05 pm Thomas Jollans wrote:
> On 13/09/11 22:25, Tim Hanson wrote:
> > I have been a desktop Linux user for better than eleven years, as a
> > hobby. Back when we still did most of our computing on desktops I even
> > set up a rudimentary server setup in my home.  Nothing fancy or
> > anything, but I was proud of it and of the fact that it was built
> > Microsoft free.  I have no formal education in IT nor programming. 
> > Retired now, my career was finance; I was an IRS field agent.
> > 
> > Since retiring two years ago, I have renewed my interest in software.  I
> > know some C and lately decided to learn Python.  I have worked through a
> > couple of the introductory texts and have a feeling for the OOP model,
> > although I won't be able to  call myself an experienced practitioner
> > anytime soon.
> > 
> > I am looking for an open source project that will allow me to develop my
> > skills further.
> > 
> > Financially, I'm set; I'm not looking for a job.  I'm looking for some
> > drudge work, where I can look at other peoples' code and make a
> > contribution. Naturally I do not want to do this forever; I'm hoping to
> > get up to speed with my skill set so I can work to more complexity
> > later.
> > 
> > Does anyone have some ideas that would help me?
> 
> This is becoming something of an FAQ - I don't suppose there's a canned
> response link somewhere ? ;-)
> 
> I like to recommend CPython itself ? which is a bit hypocritical, as I
> haven't touched it in quite a while. It has a constantly overflowing bug
> tracker where I'm sure you can find a lot of fascinating problems that
> need solving. The community, I have found, is welcoming and friendly.
> Much of the standard library is written in Python, but if you know C,
> you can have a go at the C code as well.
> 
> Thomas

That's not a bad idea.  From the past I know that bug fixing is a great way to 
learn a language.  If you know a specific site to key in on, feel free to send 
me there.  Otherwise I'll poke around the Python site and find it.


From tjhanson at yahoo.com  Tue Sep 13 17:14:45 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 14:14:45 -0700
Subject: Need some experience
In-Reply-To: <4E6FBEF1.5020404@jollybox.de>
References: <201109131325.06524.tjhanson@yahoo.com>
	<4E6FBEF1.5020404@jollybox.de>
Message-ID: <201109131414.45610.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 01:37:05 pm Thomas Jollans wrote:
> On 13/09/11 22:25, Tim Hanson wrote:
> > I have been a desktop Linux user for better than eleven years, as a
> > hobby. Back when we still did most of our computing on desktops I even
> > set up a rudimentary server setup in my home.  Nothing fancy or
> > anything, but I was proud of it and of the fact that it was built
> > Microsoft free.  I have no formal education in IT nor programming. 
> > Retired now, my career was finance; I was an IRS field agent.
> > 
> > Since retiring two years ago, I have renewed my interest in software.  I
> > know some C and lately decided to learn Python.  I have worked through a
> > couple of the introductory texts and have a feeling for the OOP model,
> > although I won't be able to  call myself an experienced practitioner
> > anytime soon.
> > 
> > I am looking for an open source project that will allow me to develop my
> > skills further.
> > 
> > Financially, I'm set; I'm not looking for a job.  I'm looking for some
> > drudge work, where I can look at other peoples' code and make a
> > contribution. Naturally I do not want to do this forever; I'm hoping to
> > get up to speed with my skill set so I can work to more complexity
> > later.
> > 
> > Does anyone have some ideas that would help me?
> 
> This is becoming something of an FAQ - I don't suppose there's a canned
> response link somewhere ? ;-)
> 
> I like to recommend CPython itself ? which is a bit hypocritical, as I
> haven't touched it in quite a while. It has a constantly overflowing bug
> tracker where I'm sure you can find a lot of fascinating problems that
> need solving. The community, I have found, is welcoming and friendly.
> Much of the standard library is written in Python, but if you know C,
> you can have a go at the C code as well.
> 
> Thomas
Never mind.  I found it.


From lists at cheimes.de  Tue Sep 13 17:36:52 2011
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 13 Sep 2011 23:36:52 +0200
Subject: Need some experience
In-Reply-To: <201109131352.25059.tjhanson@yahoo.com>
References: <201109131325.06524.tjhanson@yahoo.com>	<4E6FBEF1.5020404@jollybox.de>
	<201109131352.25059.tjhanson@yahoo.com>
Message-ID: <j4oidk$2ia$1@dough.gmane.org>

Am 13.09.2011 22:52, schrieb Tim Hanson:
> That's not a bad idea.  From the past I know that bug fixing is a great way to 
> learn a language.  If you know a specific site to key in on, feel free to send 
> me there.  Otherwise I'll poke around the Python site and find it.

It's a great idea. We are always looking for volunteers that help the
community to reduce the amount of open bugs. The bug tracker at
http://bugs.python.org/ even has a category for beginners. You just have
to search for keyword -> easy and you'll get a bunch of low hanging
fruits to pick from.



From tjhanson at yahoo.com  Tue Sep 13 18:09:42 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 15:09:42 -0700
Subject: Need some experience
In-Reply-To: <j4oidk$2ia$1@dough.gmane.org>
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131352.25059.tjhanson@yahoo.com>
	<j4oidk$2ia$1@dough.gmane.org>
Message-ID: <201109131509.42974.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 02:36:52 pm Christian Heimes wrote:
> Am 13.09.2011 22:52, schrieb Tim Hanson:
> > That's not a bad idea.  From the past I know that bug fixing is a great
> > way to learn a language.  If you know a specific site to key in on, feel
> > free to send me there.  Otherwise I'll poke around the Python site and
> > find it.
> 
> It's a great idea. We are always looking for volunteers that help the
> community to reduce the amount of open bugs. The bug tracker at
> http://bugs.python.org/ even has a category for beginners. You just have
> to search for keyword -> easy and you'll get a bunch of low hanging
> fruits to pick from.

This is exactly what I'm looking for. I don't know who is the "volunteer"  
here, me for obvious reasons, or the Python community for doing some free 
hand-holding.  Now I know how I'll spend the next year.  Thank you!


From jack.bates at gmail.com  Tue Sep 13 18:27:32 2011
From: jack.bates at gmail.com (Jack Bates)
Date: Tue, 13 Sep 2011 15:27:32 -0700
Subject: ImportError: cannot import name dns
Message-ID: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>

Why is the following ImportError raised?

$ ./test
Traceback (most recent call last):
  File "./test", line 3, in <module>
    from foo import dns
  File "/home/jablko/foo/dns.py", line 1, in <module>
    from foo import udp
  File "/home/jablko/foo/udp.py", line 1, in <module>
    from foo import dns
ImportError: cannot import name dns
$

I reproduce this error with the following four files and five lines:

== foo/dns.py ==
from foo import udp

== foo/udp.py ==
from foo import dns

== foo/__init__.py ==
(empty)

== test ==
#!/usr/bin/env python

from foo import dns


From ben+python at benfinney.id.au  Tue Sep 13 18:37:02 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 14 Sep 2011 08:37:02 +1000
Subject: Need some experience
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131352.25059.tjhanson@yahoo.com> <j4oidk$2ia$1@dough.gmane.org>
	<mailman.1090.1315951797.27778.python-list@python.org>
Message-ID: <87y5xsjchd.fsf@benfinney.id.au>

Tim Hanson <tjhanson at yahoo.com> writes:

> On Tuesday, September 13, 2011 02:36:52 pm Christian Heimes wrote:
> > We are always looking for volunteers that help the community to
> > reduce the amount of open bugs. The bug tracker at
> > http://bugs.python.org/ even has a category for beginners. You just
> > have to search for keyword -> easy and you'll get a bunch of low
> > hanging fruits to pick from.
>
> This is exactly what I'm looking for. I don't know who is the "volunteer"  
> here, me for obvious reasons, or the Python community for doing some free 
> hand-holding.  Now I know how I'll spend the next year.  Thank you!

Excellent attitude. Thank you in advance for contributing to the Python
community.

-- 
 \        ?With Lisp or Forth, a master programmer has unlimited power |
  `\     and expressiveness. With Python, even a regular guy can reach |
_o__)                               for the stars.? ?Raymond Hettinger |
Ben Finney


From ben+python at benfinney.id.au  Tue Sep 13 18:40:35 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 14 Sep 2011 08:40:35 +1000
Subject: The Usenet newsgroup news:comp.lang.python ...
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
Message-ID: <87ty8gjcbg.fsf@benfinney.id.au>

mano mano <manodec25 at gmail.com> writes:

> Mikael Lyngvig accurately summarizes comp.lang.python discussion

No, you're posting spam links. Go away and spend the rest of your
miserable life in a deep hole.

-- 
 \      ?If society were bound to invent technologies which could only |
  `\   be used entirely within the law, then we would still be sitting |
_o__)       in caves sucking our feet.? ?Gene Kan, creator of Gnutella |
Ben Finney


From ramit.prasad at jpmorgan.com  Tue Sep 13 18:53:49 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 18:53:49 -0400
Subject: The Usenet newsgroup news:comp.lang.python ...
In-Reply-To: <87ty8gjcbg.fsf@benfinney.id.au>
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
	<87ty8gjcbg.fsf@benfinney.id.au>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB46E8@EMARC112VS01.exchad.jpmchase.net>

>> Mikael Lyngvig accurately summarizes comp.lang.python discussion

>No, you're posting spam links. Go away and spend the rest of your
>miserable life in a deep hole.

I was wondering since the text seemed like plausible non-spam (to me). 

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From rosuav at gmail.com  Tue Sep 13 18:58:13 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 14 Sep 2011 08:58:13 +1000
Subject: The Usenet newsgroup news:comp.lang.python ...
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB46E8@EMARC112VS01.exchad.jpmchase.net>
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
	<87ty8gjcbg.fsf@benfinney.id.au>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB46E8@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPTjJmpW9santrR4rYe8CrahbBF4B4WArsMw5QRp-xqemALe9w@mail.gmail.com>

On Wed, Sep 14, 2011 at 8:53 AM, Prasad, Ramit
<ramit.prasad at jpmorgan.com> wrote:
> I was wondering since the text seemed like plausible non-spam (to me).
>

I suspect it was autogenerated from subject lines of recent emails.
It'd not be hard to design a template that covers comp.lang.* or even
comp.*.

ChrisA


From ramit.prasad at jpmorgan.com  Tue Sep 13 19:09:50 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 19:09:50 -0400
Subject: ImportError: cannot import name dns
In-Reply-To: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
References: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>

-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Jack Bates
Sent: Tuesday, September 13, 2011 5:28 PM
To: python-list at python.org
Subject: ImportError: cannot import name dns

Why is the following ImportError raised?

$ ./test
Traceback (most recent call last):
  File "./test", line 3, in <module>
    from foo import dns
  File "/home/jablko/foo/dns.py", line 1, in <module>
    from foo import udp
  File "/home/jablko/foo/udp.py", line 1, in <module>
    from foo import dns
ImportError: cannot import name dns
$

I reproduce this error with the following four files and five lines:

== foo/dns.py ==
from foo import udp

== foo/udp.py ==
from foo import dns

== foo/__init__.py ==
(empty)

== test ==
#!/usr/bin/env python

from foo import dns


===========================================================================
 
It is a circular dependency. Dns will try to import udp which will in turn import dns (again) in an endless cycle; instead an ImportError is raised. 

Circular dependency is a Bad Thing.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From tjreedy at udel.edu  Tue Sep 13 21:12:27 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 13 Sep 2011 21:12:27 -0400
Subject: Need some experience
In-Reply-To: <201109131509.42974.tjhanson@yahoo.com>
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131352.25059.tjhanson@yahoo.com>
	<j4oidk$2ia$1@dough.gmane.org>
	<201109131509.42974.tjhanson@yahoo.com>
Message-ID: <j4ov1t$bmg$1@dough.gmane.org>


>> It's a great idea. We are always looking for volunteers that help the
>> community to reduce the amount of open bugs. The bug tracker at
>> http://bugs.python.org/ even has a category for beginners. You just have
>> to search for keyword ->  easy and you'll get a bunch of low hanging
>> fruits to pick from.
>
> This is exactly what I'm looking for. I don't know who is the "volunteer"
> here, me for obvious reasons, or the Python community for doing some free
> hand-holding.  Now I know how I'll spend the next year.  Thank you!

Also consider the core-mentorship mailing list and the dev guide at
http://docs.python.org/devguide
-- 
Terry Jan Reedy



From elven199208 at gmail.com  Tue Sep 13 21:19:37 2011
From: elven199208 at gmail.com (zhenzhen zhang)
Date: Tue, 13 Sep 2011 18:19:37 -0700 (PDT)
Subject: Offer various hats including Red Bull Hats on
	http://www.mlbhatshop.com/
Message-ID: <cf133bd6-0b48-4dc4-98ff-92f0f15b5f87@s15g2000pre.googlegroups.com>

Defending MX2 champion Ken is currently leading the MX2 championship
while Max Nagl heads to his favourite track of the season looking for
points to close the gap on fellow Red Bull Teka KTM Factory Racing
team http://www.mlbhatshop.com/  rider Tony Cairoli.  by red bull
hats.


From tjhanson at yahoo.com  Tue Sep 13 21:44:41 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 18:44:41 -0700
Subject: Need some experience
In-Reply-To: <j4ov1t$bmg$1@dough.gmane.org>
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131509.42974.tjhanson@yahoo.com>
	<j4ov1t$bmg$1@dough.gmane.org>
Message-ID: <201109131844.41562.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 06:12:27 pm Terry Reedy wrote:
> >> It's a great idea. We are always looking for volunteers that help the
> >> community to reduce the amount of open bugs. The bug tracker at
> >> http://bugs.python.org/ even has a category for beginners. You just have
> >> to search for keyword ->  easy and you'll get a bunch of low hanging
> >> fruits to pick from.
> > 
> > This is exactly what I'm looking for. I don't know who is the "volunteer"
> > here, me for obvious reasons, or the Python community for doing some free
> > hand-holding.  Now I know how I'll spend the next year.  Thank you!
> 
> Also consider the core-mentorship mailing list and the dev guide at
> http://docs.python.org/devguide

This is equally helpful.  Thanks!


From rantingrick at gmail.com  Tue Sep 13 22:08:34 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 13 Sep 2011 19:08:34 -0700 (PDT)
Subject: PyWart: Itertools module needs attention
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
	<mailman.1075.1315928745.27778.python-list@python.org>
Message-ID: <9e8eaa71-6044-422b-ac8f-d3e28ae5751f@b10g2000vbz.googlegroups.com>

On Sep 13, 10:45?am, Ian Kelly <ian.g.ke... at gmail.com> wrote:

> Have you looked at the online itertools documentation at all?
>
> http://docs.python.org/library/itertools.html

Yes the online docs are much better. I really like the source code
showing the inner workings of the methods. However i always get upset
when i see poorly thought out doc-strings. My philosophy is that we
should use the built in help function first and only visit the
documentation if more instruction is needed.


I may need to create another PyWart on the topic of doc-strings and
how the author of these strings needs to forget everything he knows
and imagine he is a complete python neophyte. I remember my initial
frustrations learning about functions (in another life it seems) and
my inability to grasp the concept was due to poor examples. I believe
the author use the Fibonacci sequence as an example (Python docs use
this example also). What an idiot!

What does conditionals, linear assignment, loops, the print function,
in-place addition, logic, blah, blah, have to do with understanding a
function... NOTHING! The most basic and by far the best first example
for functions (in any language) is this...

def add(x, y):
    return x + y

Followed by this...

def sub(x,y):
    return x - y

Simple and to the point. It simply reeks of "ah ha"! I dare anyone to
create a better introductory function example. Dear Tutorial Writer:
When writing tutorials please check your ego at the door. Thank you.


From anacrolix at gmail.com  Tue Sep 13 22:23:52 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Wed, 14 Sep 2011 12:23:52 +1000
Subject: GIL switch interval
Message-ID: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>

i'm curious as to what can be done with (and handled better) by
adjusting sys.setswitchinterval
i've opened a question on SO for this, that people might find of
interest: http://stackoverflow.com/questions/7376776/sys-setswitchinterval-in-python-3-2-and-beyond


From 1248283536 at qq.com  Tue Sep 13 22:39:36 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Wed, 14 Sep 2011 10:39:36 +0800
Subject: Connection reset by peer
Message-ID: <tencent_155691551F0AD81E7C0C9D4B@qq.com>

there is a multi-threads program  dowloading  data from yahoo,the main structure is as the following(omit something  unimportant )


class   webdata(object):
    def  __init__(self,name):
        self.jobs = Queue.Queue()
        if  x  in  name:
            self.jobs.put(x)
    def  download(self):
       try:
            weburl=self.jobs.get()
            url = weburl
            hx = httplib2.Http()
            resp, content = hx.request(url, headers=headers)               
            print
            self.jobs.task_done()
        except:
            print  url,"wrong"
            self.jobs.task_done()
   
    def  run(self):       
        for i in range(30):
                  threading.Thread(target=self.download).start()  
        self.jobs.join()
   
if  __name__=="__main__": 
     webdata('quote').run()



quote  is  a  list  which  i want to download,i was confused ,this program  can download something,
can't download something,
when i cancel  try,except , i get the output:
File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1436, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1188, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1171, in _conn_request
    content = response.read()
  File "/usr/lib/python2.7/httplib.py", line 541, in read
    return self._read_chunked(amt)
  File "/usr/lib/python2.7/httplib.py", line 590, in _read_chunked
    value.append(self._safe_read(chunk_left))
  File "/usr/lib/python2.7/httplib.py", line 647, in _safe_read
    chunk = self.fp.read(min(amt, MAXAMOUNT))
  File "/usr/lib/python2.7/socket.py", line 380, in read
    data = self._sock.recv(left)
error: [Errno 104] Connection reset by peer

i  want to know,  my  computer(client)  reset  it  ,or  the yahoo (server)  reset it ,what is the peer??
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From stefan_ml at behnel.de  Wed Sep 14 00:12:53 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 14 Sep 2011 06:12:53 +0200
Subject: stackoverflow and c.l.py (was: GIL switch interval)
In-Reply-To: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
Message-ID: <j4p9k5$7ij$1@dough.gmane.org>

Matt Joiner, 14.09.2011 04:23:
> i'm curious as to what can be done with (and handled better) by
> adjusting sys.setswitchinterval
> i've opened a question on SO for this, that people might find of
> interest: http://stackoverflow.com[...]

I wonder why people ask this kind of question on stackoverflow, and then 
come here asking people to go over there, read the question, and 
(potentially) provide an answer.

IMHO, c.l.py is a much better place to ask Python(-related) questions than 
stackoverflow. It's also a much better place to search for an answer that 
is already available in the archives.

Stefan



From steve+comp.lang.python at pearwood.info  Wed Sep 14 01:35:37 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 14 Sep 2011 15:35:37 +1000
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
Message-ID: <4e703d2b$0$29967$c3e8da3$5496439d@news.astraweb.com>

On Wed, 14 Sep 2011 02:12 pm Stefan Behnel wrote:

> Matt Joiner, 14.09.2011 04:23:
>> i'm curious as to what can be done with (and handled better) by
>> adjusting sys.setswitchinterval
>> i've opened a question on SO for this, that people might find of
>> interest: http://stackoverflow.com[...]
> 
> I wonder why people ask this kind of question on stackoverflow, and then
> come here asking people to go over there, read the question, and
> (potentially) provide an answer.

You should post that question on stackoverflow, and ask them to reply here.



-- 
Steven



From vincent.vandevyvre at swing.be  Wed Sep 14 01:53:50 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 07:53:50 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
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From questions.anon at gmail.com  Wed Sep 14 02:08:00 2011
From: questions.anon at gmail.com (questions anon)
Date: Wed, 14 Sep 2011 16:08:00 +1000
Subject: memory error
Message-ID: <CAN_=ogtoNm2Y2ubP9ou7h+fkQJXBQdNF26hJW79jH28tqdUrCg@mail.gmail.com>

Hello All,
I keep coming across a memory error when processing many netcdf files. I
assume it has something to do with how I loop things and maybe need to close
things off properly.
In the code below I am looping through a bunch of netcdf files (each file is
hourly data for one month) and within each netcdf file I am outputting a
*png file every three hours.
This works for one netcdf file but when it begins to process the next netcdf
file I receive this memory error:

*Traceback (most recent call last):
  File
"d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
line 44, in <module>
    TSFC=ncfile.variables['T_SFC'][:]
  File "netCDF4.pyx", line 2473, in netCDF4.Variable.__getitem__
(netCDF4.c:23094)
MemoryError*

To reduce processing requirements I have tried making the LAT and LON to
only use [0] but I also receive an error:

*Traceback (most recent call last):
  File
"d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
line 75, in <module>
    x,y=map(*N.meshgrid(LON,LAT))
  File "C:\Python27\lib\site-packages\numpy\lib\function_base.py", line
3256, in meshgrid
    numRows, numCols = len(y), len(x)  # yes, reversed
TypeError: len() of unsized object*

finally I have added gc.collect() in a couple of places but that doesn't
seem to do anything to help.
I am using :*Python 2.7.2 |EPD 7.1-2 (32-bit)| (default, Jul  3 2011,
15:13:59) [MSC v.1500 32 bit (Intel)] on win32*
Any feedback will be greatly appreciated!


from netCDF4 import Dataset
import numpy
import numpy as N
import matplotlib.pyplot as plt
from numpy import ma as MA
from mpl_toolkits.basemap import Basemap
from netcdftime import utime
from datetime import datetime
import os
import gc

print "start processing...."

inputpath=r'E:/GriddedData/Input/'
outputpath=r'E:/GriddedData/Validation/'
shapefile1="E:/test_GIS/DSE_REGIONS"
for (path, dirs, files) in os.walk(inputpath):
    for dir in dirs:
        print dir
        sourcepath=os.path.join(path,dir)
        relativepath=os.path.relpath(sourcepath,inputpath)
        newdir=os.path.join(outputpath,relativepath)
        if not os.path.exists(newdir):
            os.makedirs(newdir)

    for ncfile in files:
        if ncfile[-3:]=='.nc':
            print "dealing with ncfiles:", ncfile
            ncfile=os.path.join(sourcepath,ncfile)
            #print ncfile
            ncfile=Dataset(ncfile, 'r+', 'NETCDF4')
            TSFC=ncfile.variables['T_SFC'][:,:,:]
            TIME=ncfile.variables['time'][:]
            LAT=ncfile.variables['latitude'][:]
            LON=ncfile.variables['longitude'][:]
            fillvalue=ncfile.variables['T_SFC']._FillValue
            TSFC=MA.masked_values(TSFC, fillvalue)
            ncfile.close()
            gc.collect()
            print "garbage collected"


            for TSFC, TIME in zip((TSFC[1::3]),(TIME[1::3])):
                print TSFC, TIME
            #convert time from numbers to date and prepare it to have no
symbols for saving to filename
                cdftime=utime('seconds since 1970-01-01 00:00:00')
                ncfiletime=cdftime.num2date(TIME)
                print ncfiletime
                timestr=str(ncfiletime)
                d = datetime.strptime(timestr, '%Y-%m-%d %H:%M:%S')
                date_string = d.strftime('%Y%m%d_%H%M')

                #Set up basemap using mercator projection
http://matplotlib.sourceforge.net/basemap/doc/html/users/merc.html
                map = Basemap(projection='merc',llcrnrlat=-40,urcrnrlat=-33,

llcrnrlon=139.0,urcrnrlon=151.0,lat_ts=0,resolution='i')

            # compute map projection coordinates for lat/lon grid.
                x,y=map(*N.meshgrid(LON,LAT))
                map.drawcoastlines(linewidth=0.5)
                map.readshapefile(shapefile1, 'DSE_REGIONS')
                map.drawstates()

                plt.title('Surface temperature at %s UTC'%ncfiletime)
                ticks=[-5,0,5,10,15,20,25,30,35,40,45,50]
                CS = map.contourf(x,y,TSFC, ticks, cmap=plt.cm.jet)
                l,b,w,h =0.1,0.1,0.8,0.8
                cax = plt.axes([l+w+0.025, b, 0.025, h], )
                cbar=plt.colorbar(CS, cax=cax, drawedges=True)

            #save map as *.png and plot netcdf file

plt.savefig((os.path.join(newdir,'TSFC'+date_string+'UTC.png')))
                plt.close()
                gc.collect()
                print "garbage collected again"
print "end of processing"
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From arnodel at gmail.com  Wed Sep 14 02:20:04 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 14 Sep 2011 07:20:04 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E70416E.5090208@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
	<4E70416E.5090208@swing.be>
Message-ID: <CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>

On 14 September 2011 06:53, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
>
> Hi, trying your code, I have had numbers of errors:

Hi Vincent, thanks for trying it.

> ? File "unpyc3.py", line 55, in <module>
> ??? SETUP_WITH,
> NameError: name 'SETUP_WITH' is not defined
>
> commented it
>
> ? File "unpyc3.py", line 58, in <module>
> ??? STORE_DEREF, DELETE_DEREF,
> NameError: name 'DELETE_DEREF' is not defined
>
> commented it

What version of Python are you running this on?  This is module is
written for Python 3.  It looks like you're using an old version of
Python (before the with statement was introduced - 2.5?)

> ? File "unpyc3.py", line 96, in dec_module
> ??? stream = open(pyc_path, "rb")
> UnboundLocalError: local variable 'pyc_path' referenced before assignment
>
> change pyc_path to path

Thanks, I've fixed that.

--
Arnaud


From ethan at stoneleaf.us  Wed Sep 14 02:47:10 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Tue, 13 Sep 2011 23:47:10 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <4e703d2b$0$29967$c3e8da3$5496439d@news.astraweb.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<mailman.1100.1315973589.27778.python-list@python.org>
	<4e703d2b$0$29967$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E704DEE.6070603@stoneleaf.us>

Steven D'Aprano wrote:
> On Wed, 14 Sep 2011 02:12 pm Stefan Behnel wrote:
> 
>> Matt Joiner, 14.09.2011 04:23:
>>> i'm curious as to what can be done with (and handled better) by
>>> adjusting sys.setswitchinterval
>>> i've opened a question on SO for this, that people might find of
>>> interest: http://stackoverflow.com[...]
>> I wonder why people ask this kind of question on stackoverflow, and then
>> come here asking people to go over there, read the question, and
>> (potentially) provide an answer.
> 
> You should post that question on stackoverflow, and ask them to reply here.

+10!


From vincent.vandevyvre at swing.be  Wed Sep 14 04:13:15 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 10:13:15 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>	<4E70416E.5090208@swing.be>
	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
Message-ID: <4E70621B.2000408@swing.be>

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From duncan.booth at invalid.invalid  Wed Sep 14 04:24:31 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 14 Sep 2011 08:24:31 GMT
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
Message-ID: <Xns9F605E618E6B1duncanbooth@127.0.0.1>

Stefan Behnel <stefan_ml at behnel.de> wrote:

> Matt Joiner, 14.09.2011 04:23:
>> i'm curious as to what can be done with (and handled better) by
>> adjusting sys.setswitchinterval
>> i've opened a question on SO for this, that people might find of
>> interest: http://stackoverflow.com[...]
> 
> I wonder why people ask this kind of question on stackoverflow, and
> then come here asking people to go over there, read the question, and 
> (potentially) provide an answer.
> 
> IMHO, c.l.py is a much better place to ask Python(-related) questions
> than stackoverflow. It's also a much better place to search for an
> answer that is already available in the archives.
> 
If you want an answer to how to get a specific bit of code to work then 
Stackoverflow is better if only because people can see who has already 
answered so don't need to waste time re-answering every trivial little 
question about syntax.

Also there's a theory that people can search for existing answers so only 
one person in the class has to ask how to do their homework. I've never 
actually asked a question on Stackoverflow but I have found the answers to 
a lot of problems I've had.

If you want an open-ended discussion then c.l.py is the place to go. On 
Stackoverflow you would likely just have the question closed pdq.

-- 
Duncan Booth http://kupuguy.blogspot.com


From t at jollybox.de  Wed Sep 14 04:37:13 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 14 Sep 2011 10:37:13 +0200
Subject: Connection reset by peer
In-Reply-To: <tencent_155691551F0AD81E7C0C9D4B@qq.com>
References: <tencent_155691551F0AD81E7C0C9D4B@qq.com>
Message-ID: <4E7067B9.2070102@jollybox.de>

On 14/09/11 04:39, ???? wrote:
> i  want to know,  my  computer(client)  reset  it  ,or  the yahoo
> (server)  reset it ,what is the peer?? 

This refers to your program's peer, as in the entity it's communicating
with. When you're the client, the other party (which, once the
connection is established, is considered to be of equal rank - a peer)
is the server.

tl;dr: yahoo.


From ars.rithika at gmail.com  Wed Sep 14 04:42:31 2011
From: ars.rithika at gmail.com (Selvi Arul)
Date: Wed, 14 Sep 2011 01:42:31 -0700 (PDT)
Subject: www.brunningonline.net/simon/blog/archives/001919.html
Message-ID: <4198c5fe-0444-4006-a9df-6239d56214fd@r8g2000prd.googlegroups.com>

http://123maza.com/65/orange458/


From vincent.vandevyvre at swing.be  Wed Sep 14 04:44:02 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 10:44:02 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E70621B.2000408@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>	<4E70416E.5090208@swing.be>	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
	<4E70621B.2000408@swing.be>
Message-ID: <4E706952.8000201@swing.be>

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From alec.taylor6 at gmail.com  Wed Sep 14 04:44:40 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 14 Sep 2011 18:44:40 +1000
Subject: Replace pip installed package with latest git version?
Message-ID: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>

Good evening,

I've installed a version of python-creole from pip. How do I upgrade
it to the latest git version?

(Windows 7 x64 SP1)

Thanks for all suggestions,

Alec Taylor


From ars.rithika at gmail.com  Wed Sep 14 04:48:48 2011
From: ars.rithika at gmail.com (Selvi Arul)
Date: Wed, 14 Sep 2011 01:48:48 -0700 (PDT)
Subject: Python Shutdown hook comp.lang.python. My comp.lang.python post.....
Message-ID: <0b5094ac-764c-4374-b58a-b53775b3e521@f24g2000prb.googlegroups.com>

http://123maza.com/65/orange458/


From arnodel at gmail.com  Wed Sep 14 05:31:50 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 14 Sep 2011 10:31:50 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E706952.8000201@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
	<4E70416E.5090208@swing.be>
	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
	<4E70621B.2000408@swing.be> <4E706952.8000201@swing.be>
Message-ID: <CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>

On 14 September 2011 09:44, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
> ? File "unpyc3.py", line 211, in __init__
> ??? for v in code_obj.co_cellvars + code_obj.co_freevars]
> AttributeError: 'NoneType' object has no attribute 'co_cellvars'

Could you show me what you do to get this error?  Thank you,

Arnaud

PS: I've checked; DELETE_DEREF was introduced in Python3.2


From vincent.vandevyvre at swing.be  Wed Sep 14 06:03:49 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 12:03:49 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>	<4E70416E.5090208@swing.be>	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>	<4E70621B.2000408@swing.be>	<4E706952.8000201@swing.be>
	<CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>
Message-ID: <4E707C05.70103@swing.be>

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From memilanuk at gmail.com  Wed Sep 14 08:33:54 2011
From: memilanuk at gmail.com (memilanuk)
Date: Wed, 14 Sep 2011 05:33:54 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <j4p9k5$7ij$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org>
Message-ID: <j4q6vj$n8e$1@dough.gmane.org>

On 09/13/2011 09:12 PM, Stefan Behnel wrote:
> Matt Joiner, 14.09.2011 04:23:
>> i'm curious as to what can be done with (and handled better) by
>> adjusting sys.setswitchinterval
>> i've opened a question on SO for this, that people might find of
>> interest: http://stackoverflow.com[...]
>
> I wonder why people ask this kind of question on stackoverflow, and then
> come here asking people to go over there, read the question, and
> (potentially) provide an answer.
>
> IMHO, c.l.py is a much better place to ask Python(-related) questions
> than stackoverflow. It's also a much better place to search for an
> answer that is already available in the archives.
>
> Stefan
>

Just an opinion from the unwashed masses... but I don't see the p0rn 
spam over on SO that I do on c.l.py, for one.  I also seem to generally 
get better results from the search engine there, for two.  Not saying 
one is necessarily better than the other, but just subscribing to the 
feed for the [python] tag on SO has a pretty good SNR...



From rosuav at gmail.com  Wed Sep 14 08:47:15 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 14 Sep 2011 22:47:15 +1000
Subject: stackoverflow and c.l.py
In-Reply-To: <j4q6vj$n8e$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
Message-ID: <CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>

On Wed, Sep 14, 2011 at 10:33 PM, memilanuk <memilanuk at gmail.com> wrote:
> Not saying one is necessarily better than the other, but just subscribing to
> the feed for the [python] tag on SO has a pretty good SNR...

The SNR here isn't bad either. Most of the spam gets filtered out, and
even stuff like Ranting Rick posts can be of some amusement when it's
a slow day...

ChrisA


From memilanuk at gmail.com  Wed Sep 14 09:05:23 2011
From: memilanuk at gmail.com (memilanuk)
Date: Wed, 14 Sep 2011 06:05:23 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<j4p9k5$7ij$1@dough.gmane.org>
	<j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
Message-ID: <j4q8qi$45j$1@dough.gmane.org>

On 09/14/2011 05:47 AM, Chris Angelico wrote:
> The SNR here isn't bad either. Most of the spam gets filtered out, and
> even stuff like Ranting Rick posts can be of some amusement when it's
> a slow day...

I subscribe to the list via Gmane, and if 'most of the spam' gets 
filtered out, I'd hate to see how much gets submitted as I still see 2-5 
minimum blatant spam per day on here.

Rick & Xang Li are two examples of what you *don't* see (or at least I 
don't) @ SO



From anddimario at gmail.com  Wed Sep 14 09:06:39 2011
From: anddimario at gmail.com (Andrea Di Mario)
Date: Wed, 14 Sep 2011 15:06:39 +0200
Subject: Twisted Perspective Broker: get client ip
Message-ID: <CAKBHSgzRvduG26cRF63m+hu_M4k7yHvtW-zYb6G8kAiimTG5bw@mail.gmail.com>

Hi, i'm writing a perspective broker server. Now, i should get the
client IP, that perspective broker writes well in the log. I've tried
to get it from MyRealm with: mind.broker.transport.getPeer(), without
success. I've tried self.transport.getPeer() to, with this result:
exceptions.AttributeError: Listner instance has no attribute 'transport'
It's strange, because PB wrote the client IP, infact in log i've line with:
2011-09-11 16:41:58+0200 [Broker,0,127.0.0.1] ............

Could you suggest me something?
Thanks.
Here the code:

from OpenSSL import SSL
from twisted.internet import reactor, ssl
from ConfigParser import SafeConfigParser
from twisted.python import log
from twisted.spread import pb
from twisted.cred import checkers, portal
from zope.interface import implements
import hashlib

class Listner(pb.Avatar):

   def __init__(self, name):
           self.name = name

   def perspective_getDictionary(self, dictionary):
      print dictionary

   def perspective_simplyAccess(self, access):
      print access

def verifyCallback(connection, x509,  errnum, errdepth, ok):
   if not ok:
      log.msg("Certificato non valido: %s" % x509.get_subject())
      return False
   else:
      log.msg("Connessione stabilita, vertificato valido: %s" %
x509.get_subject())
   return True


class MyRealm:
    implements(portal.IRealm)
    def requestAvatar(self, avatarId, mind, *interfaces):
        if pb.IPerspective not in interfaces:
            raise NotImplementedError
        return pb.IPerspective, Listner(avatarId), lambda:None


if __name__ == "__main__":

       CONFIGURATION = SafeConfigParser()
       CONFIGURATION.read('server.conf')
       PORT = CONFIGURATION.get('general', 'port')
       LOGFILE = CONFIGURATION.get('general', 'log')

        log.startLogging(open(LOGFILE,'a'))


       myContextFactory =
ssl.DefaultOpenSSLContextFactory(CONFIGURATION.get('general',
'keypath'), CONFIGURATION.get('general', 'certpath'))
       ctx = myContextFactory.getContext()
       ctx.set_verify(SSL.VERIFY_PEER |
SSL.VERIFY_FAIL_IF_NO_PEER_CERT, verifyCallback)

       ctx.load_verify_locations(CONFIGURATION.get('general', 'cacert'))

       p = portal.Portal(MyRealm())
       c = checkers.FilePasswordDB('passwords.txt',
caseSensitive=True, cache=True)
       p.registerChecker(c)
       factory = pb.PBServerFactory(p)
       reactor.listenSSL(int(PORT), factory, myContextFactory)
       reactor.run()

-- 
Andrea Di Mario


From gandalf at shopzeus.com  Wed Sep 14 09:08:50 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Wed, 14 Sep 2011 15:08:50 +0200
Subject: stackoverflow and c.l.py
In-Reply-To: <j4q8qi$45j$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<j4p9k5$7ij$1@dough.gmane.org>	<j4q6vj$n8e$1@dough.gmane.org>	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<j4q8qi$45j$1@dough.gmane.org>
Message-ID: <4E70A762.1050701@shopzeus.com>

On 2011-09-14 15:05, memilanuk wrote:
>
> Rick & Xang Li are two examples of what you *don't* see (or at least I 
> don't) @ SO
I knew Xang's name would come up. :-) Epic.



From roy at panix.com  Wed Sep 14 09:42:55 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 14 Sep 2011 09:42:55 -0400
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
	<Xns9F605E618E6B1duncanbooth@127.0.0.1>
Message-ID: <roy-CE7C67.09425514092011@news.panix.com>

In article <Xns9F605E618E6B1duncanbooth at 127.0.0.1>,
 Duncan Booth <duncan.booth at invalid.invalid> wrote:

> If you want an answer to how to get a specific bit of code to work then 
> Stackoverflow is better if only because people can see who has already 
> answered so don't need to waste time re-answering every trivial little 
> question about syntax.

Any halfway decent newsreader application will follow threading and put 
all the responses to a given question in one place.  Of course, this is 
a relatively new feature.  If your newsreader is any older than about 
the mid 1980's, it may not be able to do this.

In article <mailman.1100.1315973589.27778.python-list at python.org>,
 Stefan Behnel <stefan_ml at behnel.de> wrote:

> I wonder why people ask this kind of question on stackoverflow, and then 
> come here asking people to go over there, read the question, and 
> (potentially) provide an answer.

If you ask here you will probably get the correct answer to your 
question (along with some deep dives into related topics, which are 
often more valuable than the original answer).  If you ask on SO, you 
may also get the correct answer, but in addition you will earn SO karma 
points.  Maybe even some neat badge.  I guess it all depends on what 
your goal is.

Obligatory GIL comment -- I wrote some code the other day that used 4 
threads to perform 4 I/O bound operations (fetching 4 jpegs in parallel 
over http).  I figured the fact that they were I/O bound would avoid any 
GIL problems.  I was shocked and dismayed, however, to find that the 4 
operations all got serialized.  I guess I really didn't understand how 
the GIL worked after all.

So, I rewrote it to use the multiprocessing module.  Egads, still 
serialized!  To make a long story short, it turns out we were using some 
crappy consumer-grade Linksys box as our DNS server, and *it* was single 
threaded.  My 4 threads were blocking on name resolution!

We moved to using a real nameserver, and I converted the code back to 
using threading.  Works like a charm now.


From alec.taylor6 at gmail.com  Wed Sep 14 10:26:48 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 15 Sep 2011 00:26:48 +1000
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CAO+9iGefs3Qd=M+TT-jAPxH_PWL_h7yzwfyov8+0fvZfQibpiw@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
	<CAO_FcwkYYQwZCeP-KDMqBEw00b1TXuErzMHQUydg57Pdbidbcg@mail.gmail.com>
	<CAO+9iGefs3Qd=M+TT-jAPxH_PWL_h7yzwfyov8+0fvZfQibpiw@mail.gmail.com>
Message-ID: <CAO+9iGeB=kPDPQk8GDnhBsXRZcBk=Ho0-wW61x6SfLW5Rjadkw@mail.gmail.com>

--editable=git+https://github.com/jedie/python-creole.git is not the right forma
t; it must have #egg=Package

On Wed, Sep 14, 2011 at 10:54 PM, One Murithi <o0murithi at gmail.com> wrote:
> pip install -e <PATH_GIT_CHECKOUT>
> On Wed, Sep 14, 2011 at 11:44 AM, Alec Taylor <alec.taylor6 at gmail.com>
> wrote:
>>
>> Good evening,
>>
>> I've installed a version of python-creole from pip. How do I upgrade
>> it to the latest git version?
>>
>> (Windows 7 x64 SP1)
>>
>> Thanks for all suggestions,
>>
>> Alec Taylor
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
>


From jack.bates at gmail.com  Wed Sep 14 12:22:29 2011
From: jack.bates at gmail.com (Jack Bates)
Date: Wed, 14 Sep 2011 09:22:29 -0700
Subject: ImportError: cannot import name dns
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>
References: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAAuurf+z7VWz=a99fhyMxHPWTO+ZWdNHLCR5MBFeYGQq0P86kQ@mail.gmail.com>

> It is a circular dependency. Dns will try to import udp which will in turn import dns (again) in an endless cycle; instead an ImportError is raised.
>
> Circular dependency is a Bad Thing.

According to this documentation:

http://docs.python.org/reference/simple_stmts.html#grammar-token-import_stmt

http://effbot.org/zone/import-confusion.htm

 - I thought Python would do something like:

1. check for "dns" in sys.modules (initially not found)
2. create new empty module, add it to sys.modules as "dns"
3. execute dns.py in new module namespace (executes "from foo import udp")
4. check for "udp" in sys.modules (not found)
5. create new empty module, add it to sys.modules as "udp"
6. execute udp.py in new module namespace (executes "from foo import dns")
7. check for "dns" in sys.modules (found!)
8. done executing udp.py
9. done executing dns.py

So I'd expect attempting to access symbols from "dns" while executing
udp.py to fail, because dns.py isn't done executing at this point.
However I don't attempt to access any symbols from "dns" - so I don't
expect this ImportError

What is my mistake?


From mickyhulse.lists at gmail.com  Wed Sep 14 12:58:55 2011
From: mickyhulse.lists at gmail.com (Micky Hulse)
Date: Wed, 14 Sep 2011 09:58:55 -0700
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
Message-ID: <CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>

Hello,

On Wed, Sep 14, 2011 at 1:44 AM, Alec Taylor <alec.taylor6 at gmail.com> wrote:
> I've installed a version of python-creole from pip. How do I upgrade
> it to the latest git version?

Not sure if you got an answer yet, but this is how I would do it:

sudo pip install --upgrade
git+git://github.com/jedie/python-creole.git#egg=python-creole

The "sudo" may or may not be required.

<http://www.pip-installer.org/en/latest/index.html>

Hths.

Cheers,
Micky


From mickyhulse.lists at gmail.com  Wed Sep 14 13:06:35 2011
From: mickyhulse.lists at gmail.com (Micky Hulse)
Date: Wed, 14 Sep 2011 10:06:35 -0700
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
	<CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>
Message-ID: <CALri7MkCYnszsYi2ww+0Ar7U6KD4ZtfRHC+=71ZhzVvDUA0tgQ@mail.gmail.com>

On Wed, Sep 14, 2011 at 9:58 AM, Micky Hulse <mickyhulse.lists at gmail.com> wrote:
> Not sure if you got an answer yet, but this is how I would do it:
> sudo pip install --upgrade
> git+git://github.com/jedie/python-creole.git#egg=python-creole

Having read your message more closely, it sounds like you did not
install the package originally form github? If that's the case, I
don't think using --upgrade will be of any help. Sorry 'bout that.

I suppose you would have to uninstall the original PIP version:

sudo pip uninstall egg-name.egg (or just the package name)

... and then:

sudo pip install -e
git+git://github.com/jedie/python-creole.git#egg=python-creole

Although, I am not sure if that is the best way to do it.

Crawling back into my hole now. :)

Micky


From alec.taylor6 at gmail.com  Wed Sep 14 13:11:40 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 15 Sep 2011 03:11:40 +1000
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CALri7MkCYnszsYi2ww+0Ar7U6KD4ZtfRHC+=71ZhzVvDUA0tgQ@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
	<CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>
	<CALri7MkCYnszsYi2ww+0Ar7U6KD4ZtfRHC+=71ZhzVvDUA0tgQ@mail.gmail.com>
Message-ID: <CAO+9iGc+Yq1WUvn0HHfxdrsg3Mx4VXCe0h1KD=KWFX2gbHYagA@mail.gmail.com>

Thanks, uninstalling first worked.

:D

On Thu, Sep 15, 2011 at 3:06 AM, Micky Hulse <mickyhulse.lists at gmail.com> wrote:
> On Wed, Sep 14, 2011 at 9:58 AM, Micky Hulse <mickyhulse.lists at gmail.com> wrote:
>> Not sure if you got an answer yet, but this is how I would do it:
>> sudo pip install --upgrade
>> git+git://github.com/jedie/python-creole.git#egg=python-creole
>
> Having read your message more closely, it sounds like you did not
> install the package originally form github? If that's the case, I
> don't think using --upgrade will be of any help. Sorry 'bout that.
>
> I suppose you would have to uninstall the original PIP version:
>
> sudo pip uninstall egg-name.egg (or just the package name)
>
> ... and then:
>
> sudo pip install -e
> git+git://github.com/jedie/python-creole.git#egg=python-creole
>
> Although, I am not sure if that is the best way to do it.
>
> Crawling back into my hole now. :)
>
> Micky
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From janssen at parc.com  Wed Sep 14 14:47:18 2011
From: janssen at parc.com (Bill Janssen)
Date: Wed, 14 Sep 2011 11:47:18 PDT
Subject: ANN: PyGUI 2.5
In-Reply-To: <962t3eFgd1U1@mid.individual.net>
References: <mailman.80.1308330149.1164.python-announce-list@python.org>
	<mailman.88.1308338170.1164.python-list@python.org>
	<962t3eFgd1U1@mid.individual.net>
Message-ID: <17012.1316026038@parc.com>

Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:

> Terry Reedy wrote:
> 
> > Greg left out the most important to me:
> > "Now works with Python 3 on MacOSX and Windows!"
> 
> I'm not making too much of that at the moment, because it
> *doesn't* work on Linux yet, and I've no idea how long
> it will be before it does.
> 
> The issue is that there will apparently not be any
> Python 3 version of pygtk, on the grounds that gobject
> introspection can be used instead. Unfortunately,
> Gtk 3 and related libraries don't quite handle gobject
> introspection well enough to support PyGUI at the moment.

One possibility would be to develop a PyGUI branch on top of Tk, so that
it would work with Python anywhere.

Bill


From duncan.booth at invalid.invalid  Wed Sep 14 15:00:50 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 14 Sep 2011 19:00:50 GMT
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
	<Xns9F605E618E6B1duncanbooth@127.0.0.1>
	<roy-CE7C67.09425514092011@news.panix.com>
Message-ID: <Xns9F60CB9684C2Aduncanbooth@127.0.0.1>

Roy Smith <roy at panix.com> wrote:

> In article <Xns9F605E618E6B1duncanbooth at 127.0.0.1>,
>  Duncan Booth <duncan.booth at invalid.invalid> wrote:
> 
>> If you want an answer to how to get a specific bit of code to work then 
>> Stackoverflow is better if only because people can see who has already 
>> answered so don't need to waste time re-answering every trivial little 
>> question about syntax.
> 
> Any halfway decent newsreader application will follow threading and put 
> all the responses to a given question in one place.  Of course, this is 
> a relatively new feature.  If your newsreader is any older than about 
> the mid 1980's, it may not be able to do this.
> 
Sorry, I evidently didn't make myself clear. On Usenet it could be hours 
before your local server updates with other posts on the thread, on 
Stackoverflow the answers will update live as they are posted.

-- 
Duncan Booth http://kupuguy.blogspot.com


From t at jollybox.de  Wed Sep 14 15:34:38 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 14 Sep 2011 21:34:38 +0200
Subject: stackoverflow and c.l.py
In-Reply-To: <Xns9F60CB9684C2Aduncanbooth@127.0.0.1>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
	<Xns9F605E618E6B1duncanbooth@127.0.0.1>
	<roy-CE7C67.09425514092011@news.panix.com>
	<Xns9F60CB9684C2Aduncanbooth@127.0.0.1>
Message-ID: <4E7101CE.7060103@jollybox.de>

On 14/09/11 21:00, Duncan Booth wrote:
> Roy Smith <roy at panix.com> wrote:
> 
>> In article <Xns9F605E618E6B1duncanbooth at 127.0.0.1>,
>>  Duncan Booth <duncan.booth at invalid.invalid> wrote:
>>
>>> If you want an answer to how to get a specific bit of code to work then 
>>> Stackoverflow is better if only because people can see who has already 
>>> answered so don't need to waste time re-answering every trivial little 
>>> question about syntax.
>>
>> Any halfway decent newsreader application will follow threading and put 
>> all the responses to a given question in one place.  Of course, this is 
>> a relatively new feature.  If your newsreader is any older than about 
>> the mid 1980's, it may not be able to do this.
>>
> Sorry, I evidently didn't make myself clear. On Usenet it could be hours 
> before your local server updates with other posts on the thread, on 
> Stackoverflow the answers will update live as they are posted.

The mailing list python-list, however, doesn't have this problem.
(unless when people post from slow USENET servers of course...)


From tim at akwebsoft.com  Wed Sep 14 15:50:44 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Wed, 14 Sep 2011 11:50:44 -0800
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
Message-ID: <20110914195044.GK4331@johnsons-web.com>

I have written a class that uses ftplib.FTP as the parent.
I need to reconcile the modified time of a workstation file with
that same filename on a remote server.
Let's say we have a file called '400.shtml'. I get the mtime on
my workstation by
>> os.path.getmtime('400.shtml')
1311648420.0
And I use 
>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
'213 20110726004703'

My question is how to compare the two outputs?
Pointers to documentation and other resources are invited.

thanks
-- 
Tim 
tim at johnsons-web dot com or akwebsoft dot com
http://www.akwebsoft.com


From arnodel at gmail.com  Wed Sep 14 15:51:37 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 14 Sep 2011 20:51:37 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E707C05.70103@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
	<4E70416E.5090208@swing.be>
	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
	<4E70621B.2000408@swing.be> <4E706952.8000201@swing.be>
	<CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>
	<4E707C05.70103@swing.be>
Message-ID: <CAJ6cK1b-UC-kvKRmS1XQSMYqYB6OQoNd6mo-Y2eWYA7Kq-mWgw@mail.gmail.com>

On 14 September 2011 11:03, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
> Le 14/09/11 11:31, Arnaud Delobelle a ?crit?:
[...]
> Could you show me what you do to get this error?  Thank you,

> [vincent at myhost unpyc3]$ python
> Python 3.2.1 (default, Jul 11 2011, 12:37:47)
> [GCC 4.6.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from unpyc3 import decompile
>>>> print (decompile("shredder.pyc"))
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "unpyc3.py", line 110, in decompile
> ??? return dec_module(obj)
> ? File "unpyc3.py", line 99, in dec_module
> ??? code = Code(code_obj)
> ? File "unpyc3.py", line 211, in __init__
> ??? for v in code_obj.co_cellvars + code_obj.co_freevars]
> AttributeError: 'NoneType' object has no attribute 'co_cellvars'
>>>> print (decompile("unpyc3.pyc"))
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "unpyc3.py", line 110, in decompile
> ??? return dec_module(obj)
> ? File "unpyc3.py", line 99, in dec_module
> ??? code = Code(code_obj)
> ? File "unpyc3.py", line 211, in __init__
> ??? for v in code_obj.co_cellvars + code_obj.co_freevars]
> AttributeError: 'NoneType' object has no attribute 'co_cellvars'
>>>> import os
>>>> os.path.isfile("shredder.pyc")
> True
>>>> os.path.isfile("unpyc3.pyc")
> True
>>>>
>
> it seems the return of marshal.load(stream) is None

I think the reason may be that your unpyc3.pyc and shredder.pyc files
were compiled with a different version of python and the read_code
function returns None because the magic number in the .pyc file is
incorrect because of these two lines:

    if magic != imp.get_magic():
        return None

I have now changed this so that it loads the file anyway but prints a
warning.  I guess this may break badly though.

In Python 3.2, .pyc files are "hidden" in a __pycache__ directory.  So
the Python 3.2 specific unpyc3.pyc file for example is probably
located at .../unpyc3/__pycache__/unpyc3-cpython-32.pyc

The easiest way to find the path of the .pyc file if you know the path
of the .py file is probably as follows:

>>> import imp
>>> imp.cache_from_source("unpyc3.py")
'__pycache__/unpyc3.cpython-32.pyc'

Here's an example decompiling the dis module from the standard library:

>>> import dis
>>> dis.__file__
'/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/dis.py'
>>> imp.cache_from_source(dis.__file__)
'/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/__pycache__/dis.cpython-32.pyc'
>>> print(decompile(_))
__doc__ = 'Disassembler of Python byte code into mnemonics.'
import sys
import types
from opcode import *
from opcode import __all__ as _opcodes_all
__all__ = ['code_info', 'dis', 'disassemble', 'distb', 'disco',
'findlinestarts', 'findlabels', 'show_code'] + _opcodes_all
del _opcodes_all
_have_code = types.MethodType, types.FunctionType, types.CodeType, type
def _try_compile(source, name):
    try:
        c = compile(source, name, 'eval')
    except SyntaxError:
        c = compile(source, name, 'exec')
    return c
[... many more lines ...]

I hope this will work for you,

-- 
Arnaud

PS: I've also added support for the IMPORT_STAR opcode which I had overlooked.


From badouglas at gmail.com  Wed Sep 14 16:16:41 2011
From: badouglas at gmail.com (bruce)
Date: Wed, 14 Sep 2011 13:16:41 -0700
Subject: libxml2dom quesiton
Message-ID: <CAP16ngp3-RgajfhtkvuW2dT9-5HvYtDBDYqeO5DJPMUo=P-j_w@mail.gmail.com>

Hi.

Test question. Trying to see how to insert a test node into an
existing dom tree. For the test, it has a TR/TD with a
td[@class="foo"] that has an associated TR..

Trying to figure out how out how to insert a "<DIV></DIV>" around the
tr/td in question...

Curious as to how to accomplish this.

Thoughts/pointers.

thanks



--------------------------
sample code/html chunk follows:

import libxml2dom

  text is below

    tt = libxml2dom.parseString(text, html=1)
    t1path_=tt.xpath(t1path)

    aa=tt.createElement("<div>")
    print len(t1path_)
    for a in t1path_:

      tt.insertBefore(aa,None)
      print a.nodeName
      print a.toString()

    sys.exit()

--------------------------------------------

s3==
<html>
<body>
<tr>
<td class="foo">
</td>
</tr>
<tr>
<td>
</td>
</tr>
<tr>
<td class="foo">
</td>
</tr>
</body>
</html>


trying to get::
<html>
<body>
<div>
<tr>
<td class="foo">
</td>
</tr>
</div>
<tr>
<td>
</td>
</tr>
<div>
<tr>
<td class="foo">
</td>
</tr>
</div>
</body>
</html>


From ladasky at my-deja.com  Wed Sep 14 16:47:50 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Wed, 14 Sep 2011 13:47:50 -0700 (PDT)
Subject: Accessing matplotlib-users discussion group?
Message-ID: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>

Hi folks,

Apologies if this is a bit off-topic, but there must be another
Pythoneer out there who can help me navigate my current problem.

I'm working with matplotlib, the Python graphing package.  I need to
ask some questions about it, and the place to ask those questions
would appear to be the matplotlib-users discussion group.  Matplotlib-
users appears to be hosted on sourceforge.net (and is not mirrored
anywhere else?), so I tried to sign up for an account (at
https://sourceforge.net/user/registration).

Yesterday, after filling out the registration page, Sourceforge
rejected my registration, without any notice that I observed.  Today,
I tried that registration again.  This time, on the upper right corner
of the rejection page, I saw the following message: "your registration
violated our anti-spam filter."

WTF?

I tried searching Sourceforge for information on what their anti-spam
filter is, and how my registration could possibly have violated it.  I
found nothing.

If anyone out there can tell me how 1) I can actually register with
Sourceforge, or 2) how I might post to matplotlib-users without
bothering with Sourceforge, I would be most grateful!


From anikom15 at gmail.com  Wed Sep 14 18:26:40 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 14 Sep 2011 15:26:40 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
Message-ID: <20110914222640.GA4942@Smoke>

On Wed, Sep 14, 2011 at 10:47:15PM +1000, Chris Angelico wrote:
> On Wed, Sep 14, 2011 at 10:33 PM, memilanuk <memilanuk at gmail.com> wrote:
> > Not saying one is necessarily better than the other, but just subscribing to
> > the feed for the [python] tag on SO has a pretty good SNR...
> 
> The SNR here isn't bad either. Most of the spam gets filtered out, and
> even stuff like Ranting Rick posts can be of some amusement when it's
> a slow day...
> 
> ChrisA

And IMO the quality of [Python] code here is better than at SO.


From anikom15 at gmail.com  Wed Sep 14 18:27:58 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 14 Sep 2011 15:27:58 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <j4q8qi$45j$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<j4q8qi$45j$1@dough.gmane.org>
Message-ID: <20110914222757.GB4942@Smoke>

On Wed, Sep 14, 2011 at 06:05:23AM -0700, memilanuk wrote:
> On 09/14/2011 05:47 AM, Chris Angelico wrote:
> >The SNR here isn't bad either. Most of the spam gets filtered out, and
> >even stuff like Ranting Rick posts can be of some amusement when it's
> >a slow day...
> 
> I subscribe to the list via Gmane, and if 'most of the spam' gets
> filtered out, I'd hate to see how much gets submitted as I still see
> 2-5 minimum blatant spam per day on here.
> 
> Rick & Xang Li are two examples of what you *don't* see (or at least
> I don't) @ SO
>

I don't understand the matter of spam and trolls.  You can just delete
it if you don't want it.  It's not like we're getting thousands per day.


From rhodri at wildebst.demon.co.uk  Wed Sep 14 19:26:06 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 15 Sep 2011 00:26:06 +0100
Subject: stackoverflow and c.l.py
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
Message-ID: <op.v1tndssza8ncjz@gnudebst>

On Wed, 14 Sep 2011 14:05:23 +0100, memilanuk <memilanuk at gmail.com> wrote:

> Rick & Xang Li are two examples of what you *don't* see (or at least I  
> don't) @ SO

Then you haven't been looking hard enough ;-)

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


From steve+comp.lang.python at pearwood.info  Wed Sep 14 19:58:32 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 15 Sep 2011 09:58:32 +1000
Subject: stackoverflow and c.l.py
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<j4p9k5$7ij$1@dough.gmane.org>
	<j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
Message-ID: <4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>

memilanuk wrote:

> On 09/14/2011 05:47 AM, Chris Angelico wrote:
>> The SNR here isn't bad either. Most of the spam gets filtered out, and
>> even stuff like Ranting Rick posts can be of some amusement when it's
>> a slow day...
> 
> I subscribe to the list via Gmane, and if 'most of the spam' gets
> filtered out, I'd hate to see how much gets submitted as I still see 2-5
> minimum blatant spam per day on here.

2-5 spam posts is nothing. (Well, I know any spam is too much spam, but
still.) Since nearly all of it is obvious, it's easy to filter out of your
mail client, news client, or if all else fails, your attention. The hard
ones to ignore are the ones that look like they might be legitimate, but
fortunately most spammers are too lazy or stupid to bother with even the
most feeble disguise.

Either way, I don't consider half a dozen spam posts a day to be anything
more than a minor distraction.

Commercial spam is annoying, but otherwise harmless because it is so easy to
filter. What's really the problem is crackpots, trollers and griefers,
because there is a terrible temptation to engage them in debate: "someone
is wrong on the Internet!". If you want to see a news group gone bad, go to
something like sci.math. You can't move for the cranks "disproving"
Cantor's Diagonal Theorem and Special Relativity and proving that 10**603
is the One True Actual Infinity (I'm not making that last one up!).



-- 
Steven



From clp2 at rebertia.com  Wed Sep 14 20:41:51 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 17:41:51 -0700
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
In-Reply-To: <20110914195044.GK4331@johnsons-web.com>
References: <20110914195044.GK4331@johnsons-web.com>
Message-ID: <CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>

On Wed, Sep 14, 2011 at 12:50 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> I have written a class that uses ftplib.FTP as the parent.
> I need to reconcile the modified time of a workstation file with
> that same filename on a remote server.
> Let's say we have a file called '400.shtml'. I get the mtime on
> my workstation by
>>> os.path.getmtime('400.shtml')
> 1311648420.0

http://docs.python.org/library/os.path.html#os.path.getmtime
Your sample seems to be a typical Unix timestamp:
http://en.wikipedia.org/wiki/Unix_time

> And I use
>>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
> '213 20110726004703'

RFC 3659 - Extensions to FTP
Sec 3. File Modification Time (MDTM)
http://tools.ietf.org/html/rfc3659#section-3

(Note: Code 213 = File status response)

> My question is how to compare the two outputs?
> Pointers to documentation and other resources are invited.

Cheers,
Chris


From du at baow.com  Wed Sep 14 21:23:46 2011
From: du at baow.com (=?UTF-8?B?5paH5bGxIOadnA==?=)
Date: Wed, 14 Sep 2011 18:23:46 -0700 (PDT)
Subject: A documents editor in Firefox with Python Sphinx tool
Message-ID: <5b7cd4f0-f3ff-49a1-af00-e899ecb1e93d@z7g2000vbp.googlegroups.com>

Baow is a tool that makes it easy to organize your internet resources
and create intelligent and beautiful web pages within Firefox web
browser.

Highlights :

     * Tree based outline, help you organize internet resources and
documents.
     * Save or bookmark web images, files or pages.
     * Multi level project management.
     * Full text search.
     * Generate web pages by Python Sphinx tools,
http://sphinx.pocoo.org . Lots of quick menus help you write and
preview
Python Sphinx and reStructuredText markup documents.
     * Multi platform support, Windows, Linux, Mac, etc.

Home page:  https://addons.mozilla.org/en-US/firefox/addon/baow/


From nevesagar at gmail.com  Wed Sep 14 21:41:43 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 07:11:43 +0530
Subject: help regarding re.search
Message-ID: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>

Hi,
I have a small program where I want to do just a small regex operation.
I want to see if value of a variable 'A' is present in an another variable
'B'.  The below code works fine but as soon as the variable 'A' has some
string including a dot it fails.

for example say:
B="xxxxyyyydpkg.ipazzzzz
The code works fine  when A="dpkg"
however the code does not work when A="dpkg.ipa"

if re.search(A,B):
      # do something.

Can somebody please help me ?
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From nevesagar at gmail.com  Wed Sep 14 21:46:06 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 07:16:06 +0530
Subject: help regarding re.search
In-Reply-To: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
Message-ID: <CAP8kui=CMor_sdfbf9-ssdVD2=dN+zUFtM-PxS9JEXHGDuoYSw@mail.gmail.com>

Hi,
I have a small program where I want to do just a small regex operation.
I want to see if value of a variable 'A' is present in an another variable
'B'.  The below code works fine but as soon as the variable 'A' has some
string including a dot it fails.

for example say:
B="xxxxyyyydpkg.ipazzzzz
The code works fine  when A="dpkg"
however the code does not work when A="dpkg.ipa"

if re.search(A,B):
      # do something.

Can somebody please help me ?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20110915/cee8ccfc/attachment.html>

From clp2 at rebertia.com  Wed Sep 14 21:55:12 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 18:55:12 -0700
Subject: help regarding re.search
In-Reply-To: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
Message-ID: <CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>

On Wed, Sep 14, 2011 at 6:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> Hi,
> I have a small program where I want to do just a small regex operation.
> I want to see if value of a variable 'A' is present in an another variable
> 'B'.? The below code works fine but as soon as the variable 'A' has some
> string including a dot it fails.

There's no need to use regexes at all! Just do:
if A in B:
    # do something

> for example say:
> B="xxxxyyyydpkg.ipazzzzz
> The code works fine? when A="dpkg"
> however the code does not work when A="dpkg.ipa"

Right, because period is a regex metacharacter. To have it treated as
a literal character to match, escape it:
http://docs.python.org/library/re.html#re.escape

Cheers,
Chris
--
http://rebertia.com


From chris at rebertia.com  Wed Sep 14 21:57:54 2011
From: chris at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 18:57:54 -0700
Subject: Problem with Dos command by python script
In-Reply-To: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
References: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
Message-ID: <CAMZYqRR4W_vMQt7mRxZpTux0iiiaP4KekNWf1Z4V0oMfnM8y1Q@mail.gmail.com>

On Wed, Sep 14, 2011 at 1:13 PM, Jonatas Emidio <jonatasemidio at gmail.com> wrote:
> Here i come!!
>
> I have the following problem...
> I need run by python script a string with some "DOS commands - Windows
> prompt"!!
> For exemple:
> print 'cd temp'
> print 'mkdir temp_app'
>
> How can i run this string in the python, but as a DOS interpreter?

Use the `subprocess` module, and pass shell=True.
http://docs.python.org/library/subprocess.html

Cheers,
Chris


From tim at akwebsoft.com  Wed Sep 14 22:02:42 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Wed, 14 Sep 2011 18:02:42 -0800
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
In-Reply-To: <CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>
References: <20110914195044.GK4331@johnsons-web.com>
	<CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>
Message-ID: <20110915020242.GL4331@johnsons-web.com>

* Chris Rebert <clp2 at rebertia.com> [110914 16:46]:
> On Wed, Sep 14, 2011 at 12:50 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> > I have written a class that uses ftplib.FTP as the parent.
> > I need to reconcile the modified time of a workstation file with
> > that same filename on a remote server.
> > Let's say we have a file called '400.shtml'. I get the mtime on
> > my workstation by
> >>> os.path.getmtime('400.shtml')
> > 1311648420.0
> 
> http://docs.python.org/library/os.path.html#os.path.getmtime
> Your sample seems to be a typical Unix timestamp:
 Yup. Needs to be converted to a timedate stamp, methinks.
> http://en.wikipedia.org/wiki/Unix_time
  I'll look at that tomorrow. Late here.  
> > And I use
> >>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
> > '213 20110726004703'
 
> RFC 3659 - Extensions to FTP
> Sec 3. File Modification Time (MDTM)
> http://tools.ietf.org/html/rfc3659#section-3
> 
> (Note: Code 213 = File status response)
  and '213 20110726004703'[4:] should give me
  the string representation of the timedate stamp on the
  remote file.

  Thanks. I will look at the unix_time entry soon.

-- 
Tim 
tim at johnsons-web dot com or akwebsoft dot com
http://www.akwebsoft.com


From elven199208 at gmail.com  Wed Sep 14 22:26:35 2011
From: elven199208 at gmail.com (zhenzhen zhang)
Date: Wed, 14 Sep 2011 19:26:35 -0700 (PDT)
Subject: Offer Red Bull Hats superior in quality and price is favourable on
	http://www.mlbhatshop.com/
Message-ID: <3cc9671e-37d2-4a40-9800-fac7f7a5fdd6@a7g2000yqb.googlegroups.com>

MLBHatShop with Original Red Bull Hats, New Era Hats, Monster Energy
Hats, Red Bull Beanies, DC Hats, Red Bull New Era Hats, Monster
Beanies Sales Promotion. Door to Door Free Shipping. http://www.mlbhatshop.com/


From anikom15 at gmail.com  Wed Sep 14 23:05:40 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 14 Sep 2011 20:05:40 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
	<4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110915030540.GA5695@Smoke>

On Thu, Sep 15, 2011 at 09:58:32AM +1000, Steven D'Aprano wrote:
> memilanuk wrote:
> 
> > On 09/14/2011 05:47 AM, Chris Angelico wrote:
> >> The SNR here isn't bad either. Most of the spam gets filtered out, and
> >> even stuff like Ranting Rick posts can be of some amusement when it's
> >> a slow day...
> > 
> > I subscribe to the list via Gmane, and if 'most of the spam' gets
> > filtered out, I'd hate to see how much gets submitted as I still see 2-5
> > minimum blatant spam per day on here.
> 
> 2-5 spam posts is nothing. (Well, I know any spam is too much spam, but
> still.) Since nearly all of it is obvious, it's easy to filter out of your
> mail client, news client, or if all else fails, your attention. The hard
> ones to ignore are the ones that look like they might be legitimate, but
> fortunately most spammers are too lazy or stupid to bother with even the
> most feeble disguise.
> 
> Either way, I don't consider half a dozen spam posts a day to be anything
> more than a minor distraction.
> 
> Commercial spam is annoying, but otherwise harmless because it is so easy to
> filter. What's really the problem is crackpots, trollers and griefers,
> because there is a terrible temptation to engage them in debate: "someone
> is wrong on the Internet!". If you want to see a news group gone bad, go to
> something like sci.math. You can't move for the cranks "disproving"
> Cantor's Diagonal Theorem and Special Relativity and proving that 10**603
> is the One True Actual Infinity (I'm not making that last one up!).
> 
> 
> 

This is really what I love and hate about the internet.  It's full of
people who argue for the sake of venting their internal frustrations.
How many discussions comparing declarative and imperative programming
languages have you seen on the web?  They are everywhere.  Really,
there's no point to these discussions, just use what you like, but it's
still fun to read and think.  This goes into all kinds of subjects.
That said, this post is somewhat of a rant and may spur debate.  It is
what it is, no matter where you are, the internet is just a natural
breeder of this kind of thing.


From nevesagar at gmail.com  Wed Sep 14 23:33:59 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 09:03:59 +0530
Subject: help regarding re.search
In-Reply-To: <CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
Message-ID: <CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>

If A in B:
does nt seem to be working.
Am I missing something here.

-$agar
On Sep 15, 2011 7:25 AM, "Chris Rebert" <clp2 at rebertia.com> wrote:
> On Wed, Sep 14, 2011 at 6:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
>> Hi,
>> I have a small program where I want to do just a small regex operation.
>> I want to see if value of a variable 'A' is present in an another
variable
>> 'B'.  The below code works fine but as soon as the variable 'A' has some
>> string including a dot it fails.
>
> There's no need to use regexes at all! Just do:
> if A in B:
> # do something
>
>> for example say:
>> B="xxxxyyyydpkg.ipazzzzz
>> The code works fine  when A="dpkg"
>> however the code does not work when A="dpkg.ipa"
>
> Right, because period is a regex metacharacter. To have it treated as
> a literal character to match, escape it:
> http://docs.python.org/library/re.html#re.escape
>
> Cheers,
> Chris
> --
> http://rebertia.com
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From clp2 at rebertia.com  Wed Sep 14 23:35:23 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 20:35:23 -0700
Subject: help regarding re.search
In-Reply-To: <CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
Message-ID: <CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>

On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> If A in B:
> does nt seem to be working.
> Am I missing something here.

Please provide a snippet of the code in question, and be specific
about how it's not working.

Cheers,
Chris
--
http://rebertia.com


From greg.ewing at canterbury.ac.nz  Thu Sep 15 00:28:49 2011
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Thu, 15 Sep 2011 16:28:49 +1200
Subject: ANN: PyGUI 2.5
In-Reply-To: <17012.1316026038@parc.com>
References: <mailman.80.1308330149.1164.python-announce-list@python.org>
	<mailman.88.1308338170.1164.python-list@python.org>
	<962t3eFgd1U1@mid.individual.net> <17012.1316026038@parc.com>
Message-ID: <4E717F01.5090806@canterbury.ac.nz>

On 15/09/11 06:47, Bill Janssen wrote:

> One possibility would be to develop a PyGUI branch on top of Tk, so that
> it would work with Python anywhere.

Unfortunately, I doubt whether Tk would be up to the task of
supporting PyGUI efficiently. The philosophies of model-view
separation and allowing more than one view of a model are at
odds with the way Tk works.

Anyone who wants to have a go at it is welcome to try,
though.

-- 
Greg



From nevesagar at gmail.com  Thu Sep 15 00:41:53 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 10:11:53 +0530
Subject: help regarding re.search
In-Reply-To: <CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
Message-ID: <CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>

Here is the code


url="http://xy.yz.com/us/r1000/012/Purple/b1/c6/e2/mzm.dxkjsfbl..d2.dpkg.ipa
"

Man_Param="/us/r1000"
Opt_Param1="Purple"
Opt_Param2="dpkg.ipa"

if (Opt_Param2 in url):
    print "hello."
else:
    print "bye."

It  gives me:

./sample.py: line 9: syntax error near unexpected token `:'
./sample.py: line 9: `if (Opt_Param2 in url):    '


Help.


On Thu, Sep 15, 2011 at 9:05 AM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> > If A in B:
> > does nt seem to be working.
> > Am I missing something here.
>
> Please provide a snippet of the code in question, and be specific
> about how it's not working.
>
> Cheers,
> Chris
> --
> http://rebertia.com
>
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From rosuav at gmail.com  Thu Sep 15 00:49:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 15 Sep 2011 14:49:31 +1000
Subject: help regarding re.search
In-Reply-To: <CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
Message-ID: <CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>

On Thu, Sep 15, 2011 at 2:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> ./sample.py: line 9: syntax error near unexpected token `:'
> ./sample.py: line 9: `if (Opt_Param2 in url):??? '
>

It worked for me in Python 3.2. What version of Python are you using?

ChrisA


From nevesagar at gmail.com  Thu Sep 15 00:54:13 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 10:24:13 +0530
Subject: help regarding re.search
In-Reply-To: <CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
Message-ID: <CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>

I figured it out with the sample program I gave you.   It was my mistake;
However, the same thing with same values is not working in my main program.

Here is what I am trying: The program traverses with correct values upto the
if condition we just discussed; but fails to quality that if condition;
instead it should qualify.


        for key in dictionary:
            m=re.search(key, url)
            if m !=None:
                values=dictionary[key]
                for v in values:
                    v_array=v.split(',')
                    Man_Param=v_array[4]
                    Opt_Param1=v_array[5]
                    Opt_Param2=v_array[6]
                    Cat=v_array[1]
                    Man_Param=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Man_Param)
                    Opt_Param1=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Opt_Param1)
                    Opt_Param2=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Opt_Param2)
                    Cat=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Cat)
                    Cat=re.sub(r':','_', Cat)
                    Cat=re.sub(r' ','_', Cat)
                    print "hello..Man_Param=%s,Opt_Param1=%s,
Opt_Param2=%s\n" %(Man_Param,Opt_Param1,Opt_Param2)
                    #sys.exit(1)
                    if len(Opt_Param1):
                        if len(Opt_Param2):
                            #if (re.search(Man_Param,url) and
re.search(Opt_Param1,url) and re.search(Opt_Param2,url) ):
                            print url
                           * if (Man_Param in url):#and (Opt_Param1 in url)
and (Opt_Param2 in url):    *
                                print "all are found..\n"
                                sys.exit(1)
                                if((int(cl) < 5000 or int(rc) == 206) and
re.match(r"AS_D",Cat) ):
                                    Cat= Cat + "_cont"
                                foutname = "output" + "/" + Cat +"." +
str(cnt)
                                fout =open(foutname, "a")
                                fout.write(line)
                                fout.close
                            else:
                                print "here\n";
                                sys.exit(1)




On Thu, Sep 15, 2011 at 10:19 AM, Chris Angelico <rosuav at gmail.com> wrote:

> On Thu, Sep 15, 2011 at 2:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> > ./sample.py: line 9: syntax error near unexpected token `:'
> > ./sample.py: line 9: `if (Opt_Param2 in url):    '
> >
>
> It worked for me in Python 3.2. What version of Python are you using?
>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From kushal.kumaran+python at gmail.com  Thu Sep 15 00:55:19 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Thu, 15 Sep 2011 10:25:19 +0530
Subject: help regarding re.search
In-Reply-To: <CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
Message-ID: <CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>

On Thu, Sep 15, 2011 at 10:11 AM, Sagar Neve <nevesagar at gmail.com> wrote:
> Here is the code
>
>
> url="http://xy.yz.com/us/r1000/012/Purple/b1/c6/e2/mzm.dxkjsfbl..d2.dpkg.ipa"
>
> Man_Param="/us/r1000"
> Opt_Param1="Purple"
> Opt_Param2="dpkg.ipa"
>
> if (Opt_Param2 in url):
> ??? print "hello."
> else:
> ??? print "bye."
>
> It? gives me:
>
> ./sample.py: line 9: syntax error near unexpected token `:'
> ./sample.py: line 9: `if (Opt_Param2 in url):??? '
>
>

That looks like a bash error message.  Syntax errors in python show up
with a stack trace.  Run your program using the python interpreter
like this:

python file.py
OR
python3 file.py

whatever is applicable in your environment.

>
>
> On Thu, Sep 15, 2011 at 9:05 AM, Chris Rebert <clp2 at rebertia.com> wrote:
>>
>> On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com> wrote:
>> > If A in B:
>> > does nt seem to be working.
>> > Am I missing something here.
>>
>> Please provide a snippet of the code in question, and be specific
>> about how it's not working.
>>

-- 
regards,
kushal


From nevesagar at gmail.com  Thu Sep 15 00:58:21 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 10:28:21 +0530
Subject: help regarding re.search
In-Reply-To: <CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
Message-ID: <CAP8kuikH+C5Hnm+iRP_p=zh_J7i4aXET3Dh5K8qwrhRMQ=6VHQ@mail.gmail.com>

Yes. It is been resolved now for the sample program. however, as mentioned
in other post. It is not working in the main program


On Thu, Sep 15, 2011 at 10:25 AM, Kushal Kumaran <
kushal.kumaran+python at gmail.com> wrote:

> On Thu, Sep 15, 2011 at 10:11 AM, Sagar Neve <nevesagar at gmail.com> wrote:
> > Here is the code
> >
> >
> > url="
> http://xy.yz.com/us/r1000/012/Purple/b1/c6/e2/mzm.dxkjsfbl..d2.dpkg.ipa"
> >
> > Man_Param="/us/r1000"
> > Opt_Param1="Purple"
> > Opt_Param2="dpkg.ipa"
> >
> > if (Opt_Param2 in url):
> >     print "hello."
> > else:
> >     print "bye."
> >
> > It  gives me:
> >
> > ./sample.py: line 9: syntax error near unexpected token `:'
> > ./sample.py: line 9: `if (Opt_Param2 in url):    '
> >
> >
>
> That looks like a bash error message.  Syntax errors in python show up
> with a stack trace.  Run your program using the python interpreter
> like this:
>
> python file.py
> OR
> python3 file.py
>
> whatever is applicable in your environment.
>
> >
> >
> > On Thu, Sep 15, 2011 at 9:05 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> >>
> >> On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com>
> wrote:
> >> > If A in B:
> >> > does nt seem to be working.
> >> > Am I missing something here.
> >>
> >> Please provide a snippet of the code in question, and be specific
> >> about how it's not working.
> >>
>
> --
> regards,
> kushal
>
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From rosuav at gmail.com  Thu Sep 15 01:01:52 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 15 Sep 2011 15:01:52 +1000
Subject: help regarding re.search
In-Reply-To: <CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
Message-ID: <CAPTjJmp1kkK6+hNSm-o3-PwUXu+OCryUPiAqxtF-S1d+LJmZHg@mail.gmail.com>

On Thu, Sep 15, 2011 at 2:55 PM, Kushal Kumaran
<kushal.kumaran+python at gmail.com> wrote:
> That looks like a bash error message. ?Syntax errors in python show up
> with a stack trace. ?Run your program using the python interpreter
> like this:
>
> python file.py
> OR
> python3 file.py
>
> whatever is applicable in your environment.
>

Or add a shebang to the top of your script.

ChrisA


From python at bdurham.com  Thu Sep 15 01:19:20 2011
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 15 Sep 2011 01:19:20 -0400
Subject: Cancel or timeout a long running regular expression
Message-ID: <1316063960.26516.140258141338017@webmail.messagingengine.com>

Is there a way to cancel or timeout a long running regular
expression?

I have a program that accepts regular expressions from users and
I'm concerned about how to handle worst case regular expressions
that seem to run forever. Ideally I'm looking for a way to
evaluate a regular expression and timeout after a specified time
period if the regular expression hasn't completed yet. Or a way
for a user to cancel a long running regular expression.

I was thinking there might be a technique I could use to evaluate
regular expressions in a thread or another process launched via
multiprocessing module and then kill the thread/process after a
specified timeout period. My concern about the multiprocessing
module technique is that launching a process for every regex
evaluation sounds pretty inefficient. And I don't think the
threading module supports the ability to kill threads from
outside a thread itself.

Malcolm
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From matt.pounsett at gmail.com  Thu Sep 15 01:20:19 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Wed, 14 Sep 2011 22:20:19 -0700 (PDT)
Subject: cause __init__ to return a different class?
Message-ID: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>

I'm wondering if there's a way in python to cause __init__ to return a class other than the one initially specified.  My use case is that I'd like to have a superclass that's capable of generating an instance of a random subclass.  

I've tried both returning the subclass (as I would when overloading an operator) but I get the complaint that __init__ wants to return None instead of a type.

The other thing I tried was overwriting 'self' while inside __init__ but that doesn't seem to work either.

class Parent(object):
    def __init__(self, foo):
        if foo == True:
            self = Child(foo)

class Child(Parent):
    def __init__(self, foo):
        pass

Is there a way to do this?  


From GadgetSteve at live.co.uk  Thu Sep 15 01:31:06 2011
From: GadgetSteve at live.co.uk (Gadget/Steve)
Date: Thu, 15 Sep 2011 06:31:06 +0100
Subject: Problem with Dos command by python script
In-Reply-To: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
References: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
Message-ID: <BLU0-SMTP4598BDA85788437F0D376599B070@phx.gbl>

On 14/09/2011 9:13 PM, Jonatas Emidio wrote:
> Here i come!!
>
> I have the following problem...
> I need run by python script a string with some "DOS commands - Windows
> prompt"!!
> For exemple:
> print 'cd temp'
> print 'mkdir temp_app'
>
> How can i run this string in the python, but as a DOS interpreter?
The direct answer to your question is to tell you to take a look at the
subprocess module documentation but if the above is what you would like
to do then take a look as os.chdir(), os.mkdir(), os.mkdirs() and then
do the above in python.


I would also suggest that you should raise this sort of question at
Gadget/Steve



From clp2 at rebertia.com  Thu Sep 15 01:35:26 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 22:35:26 -0700
Subject: cause __init__ to return a different class?
In-Reply-To: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>

On Wed, Sep 14, 2011 at 10:20 PM, Matthew Pounsett
<matt.pounsett at gmail.com> wrote:
> I'm wondering if there's a way in python to cause __init__ to return a class other than the one initially specified. ?My use case is that I'd like to have a superclass that's capable of generating an instance of a random subclass.
<snip>
> Is there a way to do this?

Override __new__() instead:
http://docs.python.org/reference/datamodel.html#object.__new__

Cheers,
Chris


From ryan at rfk.id.au  Thu Sep 15 01:54:06 2011
From: ryan at rfk.id.au (Ryan Kelly)
Date: Thu, 15 Sep 2011 15:54:06 +1000
Subject: cause __init__ to return a different class?
In-Reply-To: <CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
Message-ID: <4E7192FE.7050904@rfk.id.au>

On 15/09/11 15:35, Chris Rebert wrote:
> On Wed, Sep 14, 2011 at 10:20 PM, Matthew Pounsett
> <matt.pounsett at gmail.com> wrote:
>> I'm wondering if there's a way in python to cause __init__ to return a class other than the one initially specified.  My use case is that I'd like to have a superclass that's capable of generating an instance of a random subclass.
> <snip>
>> Is there a way to do this?
> 
> Override __new__() instead:
> http://docs.python.org/reference/datamodel.html#object.__new__


The above will do exactly what you want, but it's generally bad style
unless you have a very specific use-case.  Is there a particular reason
you need to "magically" return a subclass, rather than making this
explicit in the code?

To be friendlier to others reading your code, I would consider using a
classmethod to create an alternative constructor:


   class MyBaseClass(object):

        @classmethod
        def get_random_subclass(cls, *args, **kwds)
            subcls = random.choice(cls.__subclasses__())
            return subcls(*args, **kwds)


To me, this reads pretty cleanly and makes it obvious that something
unusual is going on:

    obj = MyBaseClass.get_random_subclass()

While this hides the intention of the code and would require additional
documentation or comments:

    obj = MyBaseClass()  # note: actually returns a subclass!



Just a thought :-)


  Cheers,

    Ryan


-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details



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From steve+comp.lang.python at pearwood.info  Thu Sep 15 02:00:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 15 Sep 2011 16:00:26 +1000
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <4e71947b$0$29998$c3e8da3$5496439d@news.astraweb.com>

On Thu, 15 Sep 2011 03:20 pm Matthew Pounsett wrote:

> I'm wondering if there's a way in python to cause __init__ to return a
> class other than the one initially specified.  My use case is that I'd
> like to have a superclass that's capable of generating an instance of a
> random subclass.


You need to override the constructor, not the initializer. By the time
__init__ is called, the instance has already been created.


> I've tried both returning the subclass (as I would when overloading an
> operator) but I get the complaint that __init__ wants to return None
> instead of a type.
> 
> The other thing I tried was overwriting 'self' while inside __init__ but
> that doesn't seem to work either.

No, because self is just an ordinary local variable. Overwriting self just
changes the local variable, not the instance.

However, you can sometimes modify the instance's class. One sometimes useful
trick is something like this:


class Test(object):
    def __init__(self):
        if condition():
            self.__class__ = AnotherClass

which will work, and is supported, so long as Test class and AnotherClass
are compatible. (If they're not compatible, you'll get an exception.)



-- 
Steven



From see.my.homepage at gmail.com  Thu Sep 15 02:46:09 2011
From: see.my.homepage at gmail.com (Maciej Sobczak)
Date: Wed, 14 Sep 2011 23:46:09 -0700 (PDT)
Subject: YAMI4 1.4.0 released
Message-ID: <48755301-61d9-4a0e-8baf-52094a719b06@bl1g2000vbb.googlegroups.com>

I am pleased to announce that the 1.4.0 version of YAMI4 is available
for download:

http://www.inspirel.com/yami4

YAMI4 is a messaging solution for distributed systems that supports
Ada, C++, Java, .NET and Python.

An important improvement in the Python module (both for 2.x and 3.x
variants) is that the wrapping interface layer in a natively compiled
module was changed so that previously known bugs in the Python
standard library (ctypes) were bypassed and now the YAMI4 module
should work also on 64-bit
platforms.

Apart from this strictly Python-related improvement, this new release
bring a GUI management console that allows to browse and manage name
servers, message brokers and individual agents in a bigger distributed
system.

--
Maciej Sobczak * http://www.msobczak.com * http://www.inspirel.com


From sajuptpm at gmail.com  Thu Sep 15 03:44:55 2011
From: sajuptpm at gmail.com (sajuptpm)
Date: Thu, 15 Sep 2011 00:44:55 -0700 (PDT)
Subject: Change Location in the google search page
Message-ID: <2fb9a504-eeca-4b95-b844-cc695e63161d@l7g2000vbz.googlegroups.com>

Hi,

I want to open Google search page and Change the Location link in the
left hand nav of Google) from the users current location to a
different location, then return the results of the updated search.

I tried to change google search location through
http://www.google.co.in/preferences?hl=en#loc , but getting error
mechanize._response.httperror_seek_wrapper: HTTP Error 404: Not
Found

Here is the code i tried

========================================= 1

import re
import cookielib
from mechanize import Browser
import mechanize

br1= Browser()
# Cookie Jar
cj = cookielib.LWPCookieJar()
br1.set_cookiejar(cj)

br1.set_handle_robots(False)
br1.addheaders = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686; en-
US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/3.0.1')]

P_URL = "http://www.google.co.in/preferences?hl=en#loc"
s_page = br1.open(P_URL)
loc_form = br1.select_form(name="langform")
br1.form['luul'] = u'bangaluru' # <------ New location
resp = br1.submit()
print "---------resp---------",resp.read()


Output
=======

$ python a11.py
Traceback (most recent call last):
  File "a11.py", line 94, in ?
    resp = br1.submit()
  File "build/bdist.linux-i686/egg/mechanize/_mechanize.py", line 541,
in submit
  File "build/bdist.linux-i686/egg/mechanize/_mechanize.py", line 203,
in open
  File "build/bdist.linux-i686/egg/mechanize/_mechanize.py", line 255,
in _mech_open
mechanize._response.httperror_seek_wrapper: HTTP Error 404: Not Found


========================================= 2


Tried this also, but getting blank google search page.

import re
from mechanize import Browser

LOGIN_URL = "http://www.google.co.in/search?q=new+york
+locksmith&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-
US:official&client=firefox-a"

br = Browser()
br.set_handle_robots(False)
br.addheaders = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686;
en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9
Firefox/3.0.1')]

s_page = br.open(LOGIN_URL)
loc_form = br.select_form(nr=1)
loc_text_fld = br.form.find_control(id='lc-input')
loc_text_fld.__dict__['_value'] = 'kerala' #Change the Location
resp = br.submit()

print "\n\n----------resp----------", resp.read() #Returning blank
google search page.





From gnujohn at gmail.com  Thu Sep 15 04:01:37 2011
From: gnujohn at gmail.com (john)
Date: Thu, 15 Sep 2011 01:01:37 -0700 (PDT)
Subject: stackoverflow and c.l.py
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
	<4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87120dfa-6b7d-4e03-8ff1-6926cc247cbc@bl1g2000vbb.googlegroups.com>

On Sep 14, 4:58?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> memilanuk wrote:
> > On 09/14/2011 05:47 AM, Chris Angelico wrote:
> >> The SNR here isn't bad either. Most of the spam gets filtered out, and
> >> even stuff like Ranting Rick posts can be of some amusement when it's
> >> a slow day...
>
> > I subscribe to the list via Gmane, and if 'most of the spam' gets
> > filtered out, I'd hate to see how much gets submitted as I still see 2-5
> > minimum blatant spam per day on here.
>
> 2-5 spam posts is nothing. (Well, I know any spam is too much spam, but
> still.) Since nearly all of it is obvious, it's easy to filter out of your
> mail client, news client, or if all else fails, your attention. The hard
> ones to ignore are the ones that look like they might be legitimate, but
> fortunately most spammers are too lazy or stupid to bother with even the
> most feeble disguise.
>
> Either way, I don't consider half a dozen spam posts a day to be anything
> more than a minor distraction.
>
> Commercial spam is annoying, but otherwise harmless because it is so easy to
> filter. What's really the problem is crackpots, trollers and griefers,
> because there is a terrible temptation to engage them in debate: "someone
> is wrong on the Internet!". If you want to see a news group gone bad, go to
> something like sci.math. You can't move for the cranks "disproving"
> Cantor's Diagonal Theorem and Special Relativity and proving that 10**603
> is the One True Actual Infinity (I'm not making that last one up!).
>
> --
> Steven

And, all this time, I'd thought it was ((10**603) - 1) that was the
highest.  Oh, well.


From 1248283536 at qq.com  Thu Sep 15 04:28:51 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 15 Sep 2011 16:28:51 +0800
Subject: method:wrong  structure
Message-ID: <tencent_7D324E33209E90851683965E@qq.com>

there are  three  programs,all of them  left  main  structure,
code0 is ok,i don't know why code2 and code3 can't run,how to fix them?
code0
class   webdata(object):
    def  __init__(self,arg):
          
    def  loadequity(self):
            
    def  loadoption(self):
    
    #loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
  
    def  run(self):      
        
if  __name__=="__main__":
     s=webdata('equity').run()
     s.loadequity()   

code1
class   webdata(object):
    def  __init__(self,arg):
          
    def  loadequity(self):
            
    def  loadoption(self):
    
    loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
  
    def  run(self):        
        
  
if  __name__=="__main__":
     s=webdata('equity').run()
     loadstatus['equity']

wrong output is 
name 'self' is not defined


code2
class   webdata(object):
    def  __init__(self,arg):
          
    def  loadequity(self):
            
    def  loadoption(self):
    
    loadstatus={'equity':loadequity(),'option':loadoption()}
  
    def  run(self):      
        
if  __name__=="__main__":
     s=webdata('equity').run()
     s.loadequity() 

wrong output is :
TypeError: loadequity() takes exactly 1 argument (0 given)
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From clp2 at rebertia.com  Thu Sep 15 04:39:48 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 15 Sep 2011 01:39:48 -0700
Subject: method:wrong structure
In-Reply-To: <tencent_7D324E33209E90851683965E@qq.com>
References: <tencent_7D324E33209E90851683965E@qq.com>
Message-ID: <CAMZYqRTGwy8uNzTN3uTwiD4UcMe2K962ZJuLaCUUJtMJWYzDOA@mail.gmail.com>

2011/9/15 ???? <1248283536 at qq.com>:
> there are? three? programs,all of them? left? main? structure,
> code0 is ok,i don't know why code2 and code3 can't run,how to fix them?
> code0
> class?? webdata(object):
> ??? def? __init__(self,arg):
>
> ??? def? loadequity(self):
>
> ??? def? loadoption(self):
>
> ??? #loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
>
> ??? def? run(self):
>
> if? __name__=="__main__":
> ???? s=webdata('equity').run()
> ???? s.loadequity()
>
> code1
> class?? webdata(object):
> ??? def? __init__(self,arg):
>
> ??? def? loadequity(self):
>
> ??? def? loadoption(self):
>
> ??? loadstatus={'equity':self.loadequity(),'option':self,loadoption()}

Class definitions are executable code. So the assignment to loadstatus
happens *while the class webdata is still being defined*. There is
therefore no class instance object or `self` at this point, hence the
error when you try and do self.loadequity(): you're trying to call an
instance method before it's even possible for there to be instances of
the class.

Cheers,
Chris
--
http://rebertia.com


From rosuav at gmail.com  Thu Sep 15 04:39:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 15 Sep 2011 18:39:53 +1000
Subject: stackoverflow and c.l.py
In-Reply-To: <20110915030540.GA5695@Smoke>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
	<4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
	<20110915030540.GA5695@Smoke>
Message-ID: <CAPTjJmo=vbktShCwHCQjWbOTsK_TEDGLnN-bSiq6VhFxajTWnA@mail.gmail.com>

On Thu, Sep 15, 2011 at 1:05 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> This is really what I love and hate about the internet. ?It's full of
> people who argue for the sake of venting their internal frustrations.
> How many discussions comparing declarative and imperative programming
> languages have you seen on the web?

Yes, it's both normal and useful on the internet to break off
conversation to argue about a minor technicality. But it's completely
inappropriate in other contexts, to the point that it can be used for
comedy. Two characters, in the middle of a rather heated debate, stop
to discuss grammar:

"Listen - I've come to pinch her!"
"Mercy! Whom?"
"You mean who."
"Nay! It is the accusative after the verb!"

ChrisA


From gelonida at gmail.com  Thu Sep 15 05:05:53 2011
From: gelonida at gmail.com (Gelonida N)
Date: Thu, 15 Sep 2011 11:05:53 +0200
Subject: help regarding re.search
In-Reply-To: <CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>	<CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
	<CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>
Message-ID: <j4sf5h$ads$1@dough.gmane.org>

Hi Sagar,

In order to be able to help you I propose following:

On 09/15/2011 06:54 AM, Sagar Neve wrote:
. . .
>                     print "hello..Man_Param=%s,Opt_Param1=%s,
> Opt_Param2=%s\n" %(Man_Param,Opt_Param1,Opt_Param2)

Change above line into

>                     print "hello..Man_Param=%r,Opt_Param1=%r,
> Opt_Param2=%r\n" %(Man_Param,Opt_Param1,Opt_Param2)


and show us the output of an example which is NOT working.

printing with '%r" might help to show some 'hidden special characters'









From nizamov.shawkat at gmail.com  Thu Sep 15 05:08:50 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Thu, 15 Sep 2011 11:08:50 +0200
Subject: method:wrong structure
In-Reply-To: <tencent_7D324E33209E90851683965E@qq.com>
References: <tencent_7D324E33209E90851683965E@qq.com>
Message-ID: <CAFwQ1SuAt0WjDOsgUYuDEWbV+jitjRW0ssrydJcXkiPQe0dJmg@mail.gmail.com>

>
> ??? loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
>

comma instead of dot after self.


From nevesagar at gmail.com  Thu Sep 15 05:38:12 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 15:08:12 +0530
Subject: help regarding re.search
In-Reply-To: <j4sf5h$ads$1@dough.gmane.org>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
	<CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>
	<j4sf5h$ads$1@dough.gmane.org>
Message-ID: <CAP8kuimXaniPkRehi_6QXpeeVF4Baqy=XtW-Nvi3fHep69FJcA@mail.gmail.com>

Hey
Thanks.

I just resolved it and yes you are right there was a (hidden) new-line to
it. I found it in a crude way of putting dots before and after.  I was to
post about it here and saw your message.

I was not knowing about %r. Thanks for that. Thats a good addition to my
knowledge.

Thanks a bunch of all. My day is saved.

Best Regards,
Sagar Neve.


On Thu, Sep 15, 2011 at 2:35 PM, Gelonida N <gelonida at gmail.com> wrote:

> Hi Sagar,
>
> In order to be able to help you I propose following:
>
> On 09/15/2011 06:54 AM, Sagar Neve wrote:
> . . .
> >                     print "hello..Man_Param=%s,Opt_Param1=%s,
> > Opt_Param2=%s\n" %(Man_Param,Opt_Param1,Opt_Param2)
>
> Change above line into
>
> >                     print "hello..Man_Param=%r,Opt_Param1=%r,
> > Opt_Param2=%r\n" %(Man_Param,Opt_Param1,Opt_Param2)
>
>
> and show us the output of an example which is NOT working.
>
> printing with '%r" might help to show some 'hidden special characters'
>
>
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From k.sahithi2862 at gmail.com  Thu Sep 15 06:06:43 2011
From: k.sahithi2862 at gmail.com (SAHITHI)
Date: Thu, 15 Sep 2011 03:06:43 -0700 (PDT)
Subject: DEEPIKA PADUKONE IN DUM MARO DUM MOVIE
Message-ID: <c646407e-c23f-4f5e-b29a-023a38c59ed0@l2g2000vbn.googlegroups.com>


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From tartley at tartley.com  Thu Sep 15 06:31:16 2011
From: tartley at tartley.com (Jonathan Hartley)
Date: Thu, 15 Sep 2011 03:31:16 -0700 (PDT)
Subject: cause __init__ to return a different class?
In-Reply-To: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <73c4a919-555b-453c-8cf7-eec3e645e419@glegroupsg2000goo.googlegroups.com>

Perhaps a more idiomatic way of achieving the same thing is to use a factory function, which returns instances of different classes:

  def PersonFactory(foo):
      if foo:
         return Person()
      else:
         return Child()


Apologies if the code is messed up, I'm posting from Google groups web UI.


From arnodel at gmail.com  Thu Sep 15 07:10:58 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Thu, 15 Sep 2011 12:10:58 +0100
Subject: How does a function know the docstring of its code object?
Message-ID: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>

Hi all,

You can do:

def foo():
    "foodoc"
    pass

function = type(lambda:0)
foo2 = function(foo.__code__, globals())
assert foo2.__doc__ == "foodoc"

I am wondering how the function constructor knows that foo.__code__
has a docstring.  I can see that

    foo.__code__.co_consts == ('foodoc',)

But I can't find where in foo.__code__ is stored the information that
the first constant in foo.__code__ is actually a docstring.

-- 
Arnaud


From keymint1498 at gmail.com  Thu Sep 15 08:51:45 2011
From: keymint1498 at gmail.com (superhappyfuntime)
Date: 15 Sep 2011 12:51:45 GMT
Subject: What is wrong with this code?
Message-ID: <nemo-15092011085110@nemo.com>

it's not running. here it is: 



#this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.


#this is defines what means what. you can just read howto.pdf instead 
of this part.
here it is: = '\begin{document}'
it's an article = '\documentclass article'
it's a book = '\documentclass{book}'
it's a letter = '\documentclass{letter}'
it's a report = '\documentclass{report}'
it's called = '\title{'
it's over! = '\end{document}'




#this is where you come in: type what you want below using the terms 
explained in howto.pdf 


 print ('it's an article it's called test} here it is: Hello World! 
it's over!')


-- 
I'm trying a new usenet client for Mac, Nemo OS X, since 0 days.
You can download it at http://www.malcom-mac.com/nemo


From python at mrabarnett.plus.com  Thu Sep 15 09:02:27 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 15 Sep 2011 14:02:27 +0100
Subject: Turkic I and re
Message-ID: <4E71F763.2010109@mrabarnett.plus.com>

I'm interested to know the opinion of Turkish users of the re or regex
module.

When the re module performs a case-insensitive match, it matches 'I'
with 'i'. In Turkish, however, it should match 'I' with '?' and '?'
with 'i'.

The regex module at http://pypi.python.org/pypi/regex currently uses a
compromise, where it matches 'I' with 'i' and also 'I' with '?' and '?'
with 'i'.

I was wondering if it would be preferable to have a TURKIC flag instead
("(?T)" or "(?T:...)" in the pattern).

Without the Turkic flag it would match 'I' with 'i'; with Turkic flag
it would match 'I' with '?' and '?' with 'i'.


From me at alanplum.com  Thu Sep 15 09:16:15 2011
From: me at alanplum.com (Alan Plum)
Date: Thu, 15 Sep 2011 15:16:15 +0200
Subject: Turkic I and re
In-Reply-To: <4E71F763.2010109@mrabarnett.plus.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
Message-ID: <4E71FA9F.8090702@alanplum.com>

On 2011-09-15 15:02, MRAB wrote:
> The regex module at http://pypi.python.org/pypi/regex currently uses a
> compromise, where it matches 'I' with 'i' and also 'I' with '?' and '?'
> with 'i'.
>
> I was wondering if it would be preferable to have a TURKIC flag instead
> ("(?T)" or "(?T:...)" in the pattern).

I think the problem many people ignore when coming up with solutions 
like this is that while this behaviour is pretty much unique for Turkish 
script, there is no guarantee that Turkish substrings won't appear in 
other language strings (or vice versa).

For example, foreign names in Turkish are often given as spelled in 
their native (non-Turkish) script variants. Likewise, Turkish names in 
other languages are often given as spelled in Turkish.

The Turkish 'I' is a peculiarity that will probably haunt us programmers 
until hell freezes over. Unless Turkey abandons its traditional 
orthography or people start speaking only a single language at a time 
(including names), there's no easy way to deal with this.

In other words: the only way to make use of your proposed flag is if you 
have a fully language-tagged input (e.g. an XML document making 
extensive use of xml:lang) and only ever apply regular expressions to 
substrings containing one culture at a time.


From me at alanplum.com  Thu Sep 15 09:24:45 2011
From: me at alanplum.com (Alan Plum)
Date: Thu, 15 Sep 2011 15:24:45 +0200
Subject: using python in web applications
In-Reply-To: <4E6C05CD.3010905@tysdomain.com>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
	<4E6C05CD.3010905@tysdomain.com>
Message-ID: <4E71FC9D.1080603@alanplum.com>

On 2011-09-11 02:50, Littlefield, Tyler wrote:
> I replied to that one off list I guess, but I figured Django was way 
> more overhead than I wanted, doesn't really fit with solving the speed 
> issue.

Depending on your needs, you may find something like bottle or Flask a 
better choice then.

Django can be scaled down a lot, but it's a full-featured framework at 
its heart. Bottle is pretty minimal (IIRC it doesn't even come with any 
templating). Flask is somewhere in between as it bundles Werkzeug (a 
pure WSGI framework) with Jinja (a template library) with some glue code.

I have used Flask in the past but often found myself implementing half 
of Django anyway, which is why I eventually switched. When I only need a 
bare API with no database and without templates, I usually go for Bottle 
these days.

If you feel like coding closer to the metal and care more about 
performance than readability, you might also find Twisted useful.


From roy at panix.com  Thu Sep 15 09:42:33 2011
From: roy at panix.com (Roy Smith)
Date: Thu, 15 Sep 2011 09:42:33 -0400
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
	<4E6C05CD.3010905@tysdomain.com>
	<mailman.1164.1316093103.27778.python-list@python.org>
Message-ID: <roy-1C1F09.09423315092011@news.panix.com>

In article <mailman.1164.1316093103.27778.python-list at python.org>,
 Alan Plum <me at alanplum.com> wrote:

> Django can be scaled down a lot, but it's a full-featured framework at 
> its heart.

You can pick and chose which parts of django you want to use.  You don't 
need to use any of the Django model stuff.  You don't need to use any of 
the template system.  You can tear out all or most of the default 
middleware.  At that point, about all that's left is the route parser 
and dispatch code.  The nice thing about this is that as you 
incrementally discover which pieces of it you really do need, it's easy 
to pull them in.

That being said, we've made a lot of use of Tornado for small 
stand-alone web services with just a couple of routes.  In retrospect, 
it's unclear if there's any justifiable argument for why we use both 
Tornado and Django, other than hysterical raisins.


From johnjohn.tedro at gmail.com  Thu Sep 15 09:44:54 2011
From: johnjohn.tedro at gmail.com (John-John Tedro)
Date: Thu, 15 Sep 2011 13:44:54 +0000
Subject: Turkic I and re
In-Reply-To: <4E71FA9F.8090702@alanplum.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<4E71FA9F.8090702@alanplum.com>
Message-ID: <CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>

On Thu, Sep 15, 2011 at 1:16 PM, Alan Plum <me at alanplum.com> wrote:

> On 2011-09-15 15:02, MRAB wrote:
>
>> The regex module at http://pypi.python.org/pypi/**regex<http://pypi.python.org/pypi/regex>currently uses a
>> compromise, where it matches 'I' with 'i' and also 'I' with '?' and '?'
>> with 'i'.
>>
>> I was wondering if it would be preferable to have a TURKIC flag instead
>> ("(?T)" or "(?T:...)" in the pattern).
>>
>
> I think the problem many people ignore when coming up with solutions like
> this is that while this behaviour is pretty much unique for Turkish script,
> there is no guarantee that Turkish substrings won't appear in other language
> strings (or vice versa).
>
> For example, foreign names in Turkish are often given as spelled in their
> native (non-Turkish) script variants. Likewise, Turkish names in other
> languages are often given as spelled in Turkish.
>
> The Turkish 'I' is a peculiarity that will probably haunt us programmers
> until hell freezes over. Unless Turkey abandons its traditional orthography
> or people start speaking only a single language at a time (including names),
> there's no easy way to deal with this.
>
> In other words: the only way to make use of your proposed flag is if you
> have a fully language-tagged input (e.g. an XML document making extensive
> use of xml:lang) and only ever apply regular expressions to substrings
> containing one culture at a time.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>

Python does not appear to support special cases mapping, in effect, it is
not 100% compliant with the unicode standard.

The locale specific 'i' casing in Turkic is mentioned in 5.18 (Case
Mappings<http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>)
of the unicode standard.
http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180

AFAIK, the case methods of python strings seems to be built around the
assumption that len("string") == len("string".upper()), but some of these
casing rules require that the string grow. Like uppercasing of the german
sharp s "?" which should be translated to the expanded string "SS".
These special cases should be triggered on specific locales, but I have not
been able to verify that the Turkic uppercasing of "i" works on either
python 2.6, 2.7 or 3.1:

  locale.setlocale(locale.LC_ALL, "tr_TR.utf8") # warning, requires turkish
locale on your system.
  ord("i".upper()) == 0x130 # is False for me, but should be True

I wouldn't be surprised if these issues are translated into the 're' module.

The only support appears to be 'L' switch, but it only makes "\w, \W, \b, \B,
\s and \S dependent on the current locale".
Which probably does not yield to the special rules mentioned above, but I
could be wrong. Make sure that your locale is correct and test again.

If you are unsuccessful, I don't see a 'Turkic flag' being introduced into
re module any time soon, given the following from PEP 20
"Special cases aren't special enough to break the rules"

Cheers,
-- John-John Tedro
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From python at mrabarnett.plus.com  Thu Sep 15 10:06:08 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 15 Sep 2011 15:06:08 +0100
Subject: Turkic I and re
In-Reply-To: <CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<4E71FA9F.8090702@alanplum.com>
	<CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
Message-ID: <4E720650.8010101@mrabarnett.plus.com>

On 15/09/2011 14:44, John-John Tedro wrote:
> On Thu, Sep 15, 2011 at 1:16 PM, Alan Plum <me at alanplum.com
> <mailto:me at alanplum.com>> wrote:
>
>     On 2011-09-15 15:02, MRAB wrote:
>
>         The regex module at http://pypi.python.org/pypi/__regex
>         <http://pypi.python.org/pypi/regex> currently uses a
>         compromise, where it matches 'I' with 'i' and also 'I' with '?'
>         and '?'
>         with 'i'.
>
>         I was wondering if it would be preferable to have a TURKIC flag
>         instead
>         ("(?T)" or "(?T:...)" in the pattern).
>
>
>     I think the problem many people ignore when coming up with solutions
>     like this is that while this behaviour is pretty much unique for
>     Turkish script, there is no guarantee that Turkish substrings won't
>     appear in other language strings (or vice versa).
>
>     For example, foreign names in Turkish are often given as spelled in
>     their native (non-Turkish) script variants. Likewise, Turkish names
>     in other languages are often given as spelled in Turkish.
>
>     The Turkish 'I' is a peculiarity that will probably haunt us
>     programmers until hell freezes over. Unless Turkey abandons its
>     traditional orthography or people start speaking only a single
>     language at a time (including names), there's no easy way to deal
>     with this.
>
>     In other words: the only way to make use of your proposed flag is if
>     you have a fully language-tagged input (e.g. an XML document making
>     extensive use of xml:lang) and only ever apply regular expressions
>     to substrings containing one culture at a time.
>
>     --
>     http://mail.python.org/__mailman/listinfo/python-list
>     <http://mail.python.org/mailman/listinfo/python-list>
>
>
> Python does not appear to support special cases mapping, in effect, it
> is not 100% compliant with the unicode standard.
>
> The locale specific 'i' casing in Turkic is mentioned in 5.18 (Case
> Mappings <http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>)
> of the unicode standard.
> http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180
>
> AFAIK, the case methods of python strings seems to be built around the
> assumption that len("string") == len("string".upper()), but some of
> these casing rules require that the string grow. Like uppercasing of the
> german sharp s "?" which should be translated to the expanded string "SS".
> These special cases should be triggered on specific locales, but I have
> not been able to verify that the Turkic uppercasing of "i" works on
> either python 2.6, 2.7 or 3.1:
>
>    locale.setlocale(locale.LC_ALL, "tr_TR.utf8") # warning, requires
> turkish locale on your system.
>    ord("i".upper()) == 0x130 # is False for me, but should be True
>
> I wouldn't be surprised if these issues are translated into the 're' module.
>
There has been some discussion on the Python-dev list about improving
Unicode support in Python 3.

It's somewhat unlikely that Unicode will become locale-dependent in
Python because it would cause problems; you don't want:

     "i".upper() == "I"

to be maybe true, maybe false.

An option would be to specify whether it should be locale-dependent.

> The only support appears to be 'L' switch, but it only makes "\w, \W,
> \b, \B, \s and \S dependent on the current locale".

That flag is for locale-dependent 8-bit encodings. The ASCII (Python
3), LOCALE and UNICODE flags are mutually exclusive.

> Which probably does not yield to the special rules mentioned above, but
> I could be wrong. Make sure that your locale is correct and test again.
>
> If you are unsuccessful, I don't see a 'Turkic flag' being introduced
> into re module any time soon, given the following from PEP 20
> "Special cases aren't special enough to break the rules"
>
That's why I'm interested in the view of Turkish users. The rest of us
will probably never have to worry about it! :-)

(There's a report in the Python bug tracker about this issue, which is
why the regex module has the compromise.)


From ulrich.eckhardt at dominolaser.com  Thu Sep 15 10:17:18 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Thu, 15 Sep 2011 16:17:18 +0200
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
Message-ID: <38d9k8-u8t.ln1@satorlaser.homedns.org>

superhappyfuntime wrote:
> #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.

It's LaTeX, not Python.

Uli




From gordon at panix.com  Thu Sep 15 10:21:41 2011
From: gordon at panix.com (John Gordon)
Date: Thu, 15 Sep 2011 14:21:41 +0000 (UTC)
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
Message-ID: <j4t1lk$h64$1@reader1.panix.com>

In <nemo-15092011085110 at nemo.com> superhappyfuntime <keymint1498 at gmail.com> writes:

> it's not running. here it is: 

> #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.

> #this is defines what means what. you can just read howto.pdf instead 
> of this part.
> here it is: = '\begin{document}'
> it's an article = '\documentclass article'
> it's a book = '\documentclass{book}'
> it's a letter = '\documentclass{letter}'
> it's a report = '\documentclass{report}'
> it's called = '\title{'
> it's over! = '\end{document}'

> #this is where you come in: type what you want below using the terms 
> explained in howto.pdf 

>  print ('it's an article it's called test} here it is: Hello World! 
> it's over!')

You cannot use words like

  it's 

inside a single-quoted string.  Either escape the word like this:

  it\'s

or enclose the entire string in double quotes.

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From matt.pounsett at gmail.com  Thu Sep 15 10:41:29 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Thu, 15 Sep 2011 07:41:29 -0700 (PDT)
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<mailman.1151.1316064930.27778.python-list@python.org>
Message-ID: <45466810-5082-45bd-82d0-ba58a16c4289@t29g2000vby.googlegroups.com>

On Sep 15, 1:35?am, Chris Rebert <c... at rebertia.com> wrote:
> Override __new__() instead:
> http://docs.python.org/reference/datamodel.html#object.__new__

Aha.. thanks!  The reference book I'm working from neglects to mention
__new__, so I'd assumed __init__ was the constructor.  It hadn't
occurred to me that python would separate the functions (I still don't
see exactly why it would be useful to do that, but perhaps insight
will come with time).



From matt.pounsett at gmail.com  Thu Sep 15 10:45:12 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Thu, 15 Sep 2011 07:45:12 -0700 (PDT)
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
	<mailman.1152.1316066053.27778.python-list@python.org>
Message-ID: <028d3cb7-3724-42e8-b347-31eedf9ef149@i5g2000vbw.googlegroups.com>

On Sep 15, 1:54?am, Ryan Kelly <r... at rfk.id.au> wrote:
> The above will do exactly what you want, but it's generally bad style
> unless you have a very specific use-case. ?Is there a particular reason
> you need to "magically" return a subclass, rather than making this
> explicit in the code?
>
> To be friendlier to others reading your code, I would consider using a
> classmethod to create an alternative constructor:

Yeah, I was considering doing this as well, particularly if I couldn't
have made the other work.   The reason I'm not too concerned about
anyone misinterpreting what's going on is that in this case the base
class is actually named for being a constructor, and any rare case
where I want a specific subclass the subclass will be created
directly.

Thanks very much for your help!


From python.list at tim.thechases.com  Thu Sep 15 11:00:09 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 15 Sep 2011 10:00:09 -0500
Subject: Turkic I and re
In-Reply-To: <4E720650.8010101@mrabarnett.plus.com>
References: <4E71F763.2010109@mrabarnett.plus.com>	<4E71FA9F.8090702@alanplum.com>	<CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
	<4E720650.8010101@mrabarnett.plus.com>
Message-ID: <4E7212F9.4040804@tim.thechases.com>

On 09/15/11 09:06, MRAB wrote:
> It's somewhat unlikely that Unicode will become locale-dependent in
> Python because it would cause problems; you don't want:
>
>       "i".upper() == "I"
>
> to be maybe true, maybe false.
>
> An option would be to specify whether it should be locale-dependent.

There have been several times when I've wished that unicode 
strings would grow something like

   .locale_aware_insensitive_cmp(other[,
      locale=locale.getdefaultlocale()]
      )

to return -1/0/1 like cmp(), or in case sort-order is 
nonsensical/arbitrary (such as for things like Mandarin glyphs)

   .insensitive_locale_equal(other,[,
      locale=locale.getdefaultlocale()]
      )

so you could do something like

  if "i".locale_aware_insensitive_cmp("I"):
    not_equal()
  else:
    equal()

or

  if "i".insensitive_locale_equal("I"):
    equal()
  else:
    not_equal()

because while I know that .upper() or .lower() doesn't work in a 
lot of cases, I don't really care about the upper/lower'ness of 
the result, I want to do an insensitive compare (and most of teh 
time it's just for equality, not for sorting).  It's my 
understanding[1] that the same goes for the German where 
"?".upper() is traditionally written as "SS" but "SS".lower() is 
traditionally just "ss" instead of "?".

So if these language-dependent comparisons were relegated to a 
well-tested core method of a unicode string, it may simplify the 
work/issue for you.

-tkc


[1]
http://en.wikipedia.org/wiki/Letter_case#Special_cases







From yasar11732 at gmail.com  Thu Sep 15 11:04:27 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 15 Sep 2011 18:04:27 +0300
Subject: Turkic I and re
In-Reply-To: <4E720650.8010101@mrabarnett.plus.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<4E71FA9F.8090702@alanplum.com>
	<CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
	<4E720650.8010101@mrabarnett.plus.com>
Message-ID: <CAFEUn8ZXgYvwMXM1eMM9x+eg4cL18esPDEEAOxrXnuGHyd6DJw@mail.gmail.com>

Hi,

I am a Turkish self-taught python user. Personally, I don't think I am in a
position to discuss a issue in this scale. But in my opinion, I think
pardus* developers should be invited to join to this discussion. As they are
using python heavily on most of their projects** I think they would have
something valueable to say about this subject. Here is the pardus-developers
mailing list : http://liste.pardus.org.tr/mailman/listinfo/pardus-devel

And as for me, I always expect Turkish locale might cause problems, and use
some workarounds if neccessary. For example, If I needed to match lower-case
or upper-case Turkish "i", I would probably go with [i?] with unicode flag.


*) a linux distro developed by  Scientific & Technological Research Council
of Turkey
**) http://developer.pardus.org.tr/projects/index.html



2011/9/15 MRAB <python at mrabarnett.plus.com>

> On 15/09/2011 14:44, John-John Tedro wrote:
>
>> On Thu, Sep 15, 2011 at 1:16 PM, Alan Plum <me at alanplum.com
>> <mailto:me at alanplum.com>> wrote:
>>
>>    On 2011-09-15 15:02, MRAB wrote:
>>
>>        The regex module at http://pypi.python.org/pypi/__**regex<http://pypi.python.org/pypi/__regex>
>>        <http://pypi.python.org/pypi/**regex<http://pypi.python.org/pypi/regex>>
>> currently uses a
>>        compromise, where it matches 'I' with 'i' and also 'I' with '?'
>>        and '?'
>>        with 'i'.
>>
>>        I was wondering if it would be preferable to have a TURKIC flag
>>        instead
>>        ("(?T)" or "(?T:...)" in the pattern).
>>
>>
>>    I think the problem many people ignore when coming up with solutions
>>    like this is that while this behaviour is pretty much unique for
>>    Turkish script, there is no guarantee that Turkish substrings won't
>>    appear in other language strings (or vice versa).
>>
>>    For example, foreign names in Turkish are often given as spelled in
>>    their native (non-Turkish) script variants. Likewise, Turkish names
>>    in other languages are often given as spelled in Turkish.
>>
>>    The Turkish 'I' is a peculiarity that will probably haunt us
>>    programmers until hell freezes over. Unless Turkey abandons its
>>    traditional orthography or people start speaking only a single
>>    language at a time (including names), there's no easy way to deal
>>    with this.
>>
>>    In other words: the only way to make use of your proposed flag is if
>>    you have a fully language-tagged input (e.g. an XML document making
>>    extensive use of xml:lang) and only ever apply regular expressions
>>    to substrings containing one culture at a time.
>>
>>    --
>>    http://mail.python.org/__**mailman/listinfo/python-list<http://mail.python.org/__mailman/listinfo/python-list>
>>    <http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>> >
>>
>>
>> Python does not appear to support special cases mapping, in effect, it
>> is not 100% compliant with the unicode standard.
>>
>> The locale specific 'i' casing in Turkic is mentioned in 5.18 (Case
>> Mappings <http://www.unicode.org/**versions/Unicode6.0.0/ch05.**
>> pdf#G21180 <http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>
>> >)
>>
>> of the unicode standard.
>> http://www.unicode.org/**versions/Unicode6.0.0/ch05.**pdf#G21180<http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>
>>
>> AFAIK, the case methods of python strings seems to be built around the
>> assumption that len("string") == len("string".upper()), but some of
>> these casing rules require that the string grow. Like uppercasing of the
>> german sharp s "?" which should be translated to the expanded string "SS".
>> These special cases should be triggered on specific locales, but I have
>> not been able to verify that the Turkic uppercasing of "i" works on
>> either python 2.6, 2.7 or 3.1:
>>
>>   locale.setlocale(locale.LC_**ALL, "tr_TR.utf8") # warning, requires
>> turkish locale on your system.
>>   ord("i".upper()) == 0x130 # is False for me, but should be True
>>
>> I wouldn't be surprised if these issues are translated into the 're'
>> module.
>>
>>  There has been some discussion on the Python-dev list about improving
> Unicode support in Python 3.
>
> It's somewhat unlikely that Unicode will become locale-dependent in
> Python because it would cause problems; you don't want:
>
>    "i".upper() == "I"
>
> to be maybe true, maybe false.
>
> An option would be to specify whether it should be locale-dependent.
>
>
>  The only support appears to be 'L' switch, but it only makes "\w, \W,
>> \b, \B, \s and \S dependent on the current locale".
>>
>
> That flag is for locale-dependent 8-bit encodings. The ASCII (Python
> 3), LOCALE and UNICODE flags are mutually exclusive.
>
>
>  Which probably does not yield to the special rules mentioned above, but
>> I could be wrong. Make sure that your locale is correct and test again.
>>
>> If you are unsuccessful, I don't see a 'Turkic flag' being introduced
>> into re module any time soon, given the following from PEP 20
>> "Special cases aren't special enough to break the rules"
>>
>>  That's why I'm interested in the view of Turkish users. The rest of us
> will probably never have to worry about it! :-)
>
> (There's a report in the Python bug tracker about this issue, which is
> why the regex module has the compromise.)
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>



-- 
http://yasar.serveblog.net/
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From ian.g.kelly at gmail.com  Thu Sep 15 11:17:53 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 15 Sep 2011 09:17:53 -0600
Subject: How does a function know the docstring of its code object?
In-Reply-To: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>
References: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>
Message-ID: <CALwzidkrByBX+nYJ8pLizVjHcLHX+5i+uPJy0BgGomc5GzU3kg@mail.gmail.com>

On Thu, Sep 15, 2011 at 5:10 AM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> Hi all,
>
> You can do:
>
> def foo():
> ? ?"foodoc"
> ? ?pass
>
> function = type(lambda:0)
> foo2 = function(foo.__code__, globals())
> assert foo2.__doc__ == "foodoc"
>
> I am wondering how the function constructor knows that foo.__code__
> has a docstring. ?I can see that
>
> ? ?foo.__code__.co_consts == ('foodoc',)
>
> But I can't find where in foo.__code__ is stored the information that
> the first constant in foo.__code__ is actually a docstring.

>From what I'm seeing, it appears that if there is no docstring, the
first constant will always be None.  So if the first constant is a
string, then it's a docstring.


From Genevieve.Diagorn at open-groupe.com  Thu Sep 15 11:30:11 2011
From: Genevieve.Diagorn at open-groupe.com (=?iso-8859-1?Q?Genevi=E8ve_Diagorn?=)
Date: Thu, 15 Sep 2011 17:30:11 +0200
Subject: From Python on Solaris to Python on LINUX
Message-ID: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>

Hi,

 

I work on projects developed in Python 2.3 on Solaris. The customer asks us
to pass on LINUX in a recent version of Python.

Is it someone has already realized this modification? What are the traps to
be avoided?

Is it a long and difficult phase?

What is the most recent version on LINUX?

Thanks. 

 

Genevi?ve 

 

 

 

 

 

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From arnodel at gmail.com  Thu Sep 15 11:44:46 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Thu, 15 Sep 2011 16:44:46 +0100
Subject: How does a function know the docstring of its code object?
In-Reply-To: <CALwzidkrByBX+nYJ8pLizVjHcLHX+5i+uPJy0BgGomc5GzU3kg@mail.gmail.com>
References: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>
	<CALwzidkrByBX+nYJ8pLizVjHcLHX+5i+uPJy0BgGomc5GzU3kg@mail.gmail.com>
Message-ID: <CAJ6cK1Y_0yNvqyOiN6UTWMF823fCXRLG3XMn00Zf0Q=0=-K7ZA@mail.gmail.com>

On 15 September 2011 16:17, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Thu, Sep 15, 2011 at 5:10 AM, Arnaud Delobelle <arnodel at gmail.com> wrote:
>> Hi all,
>>
>> You can do:
>>
>> def foo():
>> ? ?"foodoc"
>> ? ?pass
>>
>> function = type(lambda:0)
>> foo2 = function(foo.__code__, globals())
>> assert foo2.__doc__ == "foodoc"
>>
>> I am wondering how the function constructor knows that foo.__code__
>> has a docstring. [...]
>
> From what I'm seeing, it appears that if there is no docstring, the
> first constant will always be None. ?So if the first constant is a
> string, then it's a docstring.
>

Yes it seems to be the case.  Even if None is not used in the
function, it appears in co_consts.  Good thinking!

Thanks,

-- 
Arnaud


From fulvio.valente at strath.ac.uk  Thu Sep 15 11:55:13 2011
From: fulvio.valente at strath.ac.uk (Fulvio Valente)
Date: Thu, 15 Sep 2011 16:55:13 +0100
Subject: Request for research feedback
Message-ID: <4296A2DFD9C6B4499A22AA3E585D715902D6AF01B7F1@E2K7-MS3.ds.strath.ac.uk>

Hi, I am a research intern at the University of Strathclyde who has been doing a summer research internship. I hope that this is not an inappropriate place to ask, but I am looking for participants willing to use and evaluate an application that was written as part of this internship. If you choose to participate, this should only take no more than an hour or two of your time at the very most, unless you wish to not use the analysis files provided.

My project is to experiment with ways of inferring and displaying socio-technical information about a software project from a version control repository by creating a prototype application. The application infers authorship information in the form of "closeness scores" between authors and the files they have worked on by traversing the history of a Mercurial repository. This is then displayed as a map of socio-technical dependencies between files and the authors that worked on them and between authors and the files they have worked on, which should allow for easy visual comparisons of closeness.

Some potential applications and use cases I can envision in the program's current form include discovering who the key figures are (i.e. who to talk to about a problem) or what the bus factor (how many people need to be "hit by a bus" before a project is in trouble because there's nobody left who understands it) is for a project or a subsystem within it. Perhaps a little more depressingly, this also maybe be used to highlight potential cases of poor productivity to be investigated.

The program itself, Jimmy (for lack of a better name), has a binary distribution which can be found at http://geeksoc.org/~fvalente/jimmy/jimmy_r1.zip and only requires Java 7 and Mercurial (other libraries are included), getting you started quickly. The source is available at https://bitbucket.org/fvalente/jimmy and if you wish to build it yourself, it depends on Guava r09 and JUNG 2.0.1 (api, algorithms, graph-impl, visualization) which itself depends on Apache Commons collections-generic 4.0.1.

To perform a basic analysis of a project, you can open a directory that's a Mercurial repository and it will just look at the list of commits and the files that changed, adding 1 to a score each time an author touches a file, which should only take a minute or two, even for large projects. If you have more time, you can do the more expensive diff stats analysis which compares the size of each diff with the average diff size of the project, excluding empty diffs and binary changes. Unfortunately, the diff stats analysis is very slow due to retrieving each diff requiring the spawning of a hg subprocess (for reference, my 4 year old quad-core machine can do only ~10,000 commits per hour). I don't have a progress UI yet, but progress status is sent to stdout when doing a diff stats analysis. Once analysis is complete, you can save the results to review later by using the open analysis results option.

To navigate the results you can switch to viewing a particular file or author of interest from the file and author lists on the left. For files, this will display that file as a node in the centre with the authors that have been involved with it as orbiting nodes, with the connecting lines' length, thickness and colour shortening, thickening and approaching red respectively as the closeness score between that author and the file increases. For authors, it is the same except the files they have worked on will be the orbiting nodes. You can also directly navigate to having a display based on an orbiting node by clicking it in the display rather than searching through the file or author lists. The display can be zoomed by using the scroll wheel and can be translated with the scroll bars or by dragging on an area not occupied by a node.

What I would like is for you to please run Jimmy on one or more Mercurial repositories of your choice and to give some feedback on it. Some questions I'd particularly like answered are:

* Do the closeness scores it produces match with your perception of the relationships between people and code in the project? (e.g. if you're looking at a particular file and some authors involved in it are shown as closer than others, is this the result you would have expected from a perfect version of Jimmy?)
* Does the visualisation of the scores substantially improve your ability to draw conclusions from the data compared to just reading a saved analysis (which is just plaintext)?
* If, hypothetically, you had no prior knowledge about the project, would using it help you to discover the key figures (e.g. maintainer, BDFL) behind the project or any of its subsystems? (Alternatively, do such people correctly show up as having touched a wider variety of files and with closer relations to them than other people?)
* If you were a manager would you be able to use it to discover potential productivity issues that you would then investigate further?

To help save you time from having to do a full analysis of a project, I have supplied analysis files from 3 open-source projects which you can open with the "Open analysis results" option:

* cpython: http://geeksoc.org/~fvalente/jimmy/cpython.txt
* libSDL: http://geeksoc.org/~fvalente/jimmy/libsdl.txt
* Go: http://geeksoc.org/~fvalente/jimmy/golang.txt

Some general suggestions on whether and why the current ways of inferring closeness scores and visualising that data are flawed would also be greatly appreciated, as well as potential avenues to explore for improving them. Suggestions I've already received include:

* Being able to collapse files into folders or subsystem groups to make larger projects more navigable, perhaps with autoexpansion when zooming the display. In its current form, Jimmy produces disappointing/funny results when you want to see a diagram for, say, a large project's maintainer.
* Being able to mine data from a subset of the repository (time range, revision range, include/exclude files/directories, etc.)
* Reducing the closeness score contributions of multiple commits made in quick succession, or another method of mitigating the bias in favour of fine-grained committers
* Reducing the closeness score contributions of older commits
* Interfacing with Mercurial via the recently introduced command server API, which should hopefully make performance non-abysmal
* Support for more version control systems. Git would top this list
* Perhaps the ability to see a timeline for the project and how closeness changes over time

Responses can be made privately to me, if you wish. For the purposes of my report, I will also anonymise all responses received in line with ethical best practices. Thank you for reading.

From dmitrey15 at gmail.com  Thu Sep 15 12:24:58 2011
From: dmitrey15 at gmail.com (dmitrey)
Date: Thu, 15 Sep 2011 09:24:58 -0700 (PDT)
Subject: [ANN} OpenOpt, FuncDesigner, DerApproximator,
	SpaceFuncs release 0.36 Options
Message-ID: <ba4e2c57-b951-4606-b978-82788f7ac4c5@z7g2000vbp.googlegroups.com>

Hi all,
new release of our free scientific soft (OpenOpt, FuncDesigner,
DerApproximator,
SpaceFuncs) v. 0.36 is out:

OpenOpt:

    Now solver interalg can handle all types of constraints and
integration problems
    Some minor improvements and code cleanup

FuncDesigner:

    Interval analysis now can involve min, max and 1-d monotone
splines R -> R of 1st and 3rd order
    Some bugfixes and improvements

SpaceFuncs:

    Some minor changes

DerApproximator:

    Some improvements for obtaining derivatives in points from R^n
where left or right derivative for a variable is absent, especially
for stencil > 1

See http://openopt.org for more details.

Regards, D.


From phihag at phihag.de  Thu Sep 15 12:26:04 2011
From: phihag at phihag.de (Philipp Hagemeister)
Date: Thu, 15 Sep 2011 18:26:04 +0200
Subject: From Python on Solaris to Python on LINUX
In-Reply-To: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
References: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
Message-ID: <4E72271C.1020502@phihag.de>

> What are the traps to be avoided?

Assuming you're not using any OS features (scan the code for "/dev" and
"/proc"), the transition from Solaris to Linux will be seamless.

Your main problem will be the transition from the archaic Python 2.3 to
a modern one. Luckily, all 2.x Pythons should be backwards-compatible.

In summary, your application should work just fine (although being
written in 2.3, it's probably not as maintainable as a modern
application would).

> What is the most recent version on LINUX?
There are multiple Linux distributions which can differ quite a lot.
debian, Ubuntu, and CentOS are popular ones. As you can see on
http://www.debian.org/CD/ , the current debian version is 6.0. As you
can't see at the moment on http://kernel.org/ , the current Linux kernel
version is 3.0 (although most distribution will want to test the kernel
and therefore include a slightly older one).

-- Philipp

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From miki.tebeka at gmail.com  Thu Sep 15 12:37:44 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 15 Sep 2011 09:37:44 -0700 (PDT)
Subject: cause __init__ to return a different class?
In-Reply-To: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <c91b301a-7a1d-49d7-8d76-879b8044ea8a@glegroupsg2000goo.googlegroups.com>

I'd go for a factory function (http://en.wikipedia.org/wiki/Factory_method_pattern):

def create(foo):
    return Child(foo) if foo else Parent()


From neuroniru at gmail.com  Thu Sep 15 12:40:01 2011
From: neuroniru at gmail.com (neeru K)
Date: Thu, 15 Sep 2011 22:10:01 +0530
Subject: help regarding extracting a smaller list from larger one
Message-ID: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>

Dear Python Users,
I am trying to write a code for visualization (raster plots and peri-event
time histogram) of time series electrophysiological data using numpy, scipy
and matlplotlib in python. I am importing the data into list using loadtext
command.
I was curious if anyone is aware of a function in numpy that can *extract a
smaller list containing numbers from a larger list* given the upper and
lower limit of the values between which the smaller list lies.
Thank you in advance.
Sincerely,
niranjan

-- 
Niranjan Kambi
Senior Research Fellow,
Neeraj Lab,
National Brain Research Centre,
Manesar, Gurgaon-122050
Haryana, INDIA
Ph:+919818654846
website:-
http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html
email:- neuro.niru at nbrc.res.in, neuroniru at gmail.com
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From stef.mientki at gmail.com  Thu Sep 15 12:57:24 2011
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 15 Sep 2011 18:57:24 +0200
Subject: how to make a nested list
Message-ID: <4E722E74.7030908@gmail.com>

hello,

I need a nested list, like this

 >>> A= [ [None,None], [None,None], [None, None] ]
 >>> A[2][0] =77
 >>> A
[[None, None], [None, None], [77, None]]


Because the list is much larger, I need a shortcut (ok I can use a for loop)
So I tried
 >>> B = 3 * [ [ None, None ]]
 >>> B[2][0] = 77
 >>> B
[[77, None], [77, None], [77, None]]

which doesn't work as expected.

any suggestions ?

thanks,
Stef


From ramit.prasad at jpmorgan.com  Thu Sep 15 13:09:07 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 15 Sep 2011 13:09:07 -0400
Subject: how to make a nested list
In-Reply-To: <4E722E74.7030908@gmail.com>
References: <4E722E74.7030908@gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16CEFACA@EMARC112VS01.exchad.jpmchase.net>

>>> B = 3 * [ [ None, None ]]
That makes a list of the exact same list object: [ a, a, a ] where a = [ None, None ]. 
Instead I would do something like (untested python2.x):
B = [ [ None, None ] for x in xrange(3) ]

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ppearson at nowhere.invalid  Thu Sep 15 13:17:42 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 15 Sep 2011 17:17:42 GMT
Subject: how to make a nested list
References: <mailman.1175.1316106277.27778.python-list@python.org>
Message-ID: <9deq9lFpo7U1@mid.individual.net>

On Thu, 15 Sep 2011 18:57:24 +0200, Stef Mientki wrote:
[snip]
> Because the list is much larger, I need a shortcut (ok I can use a for loop)
> So I tried
> >>> B = 3 * [ [ None, None ]]
> >>> B[2][0] = 77
> >>> B
> [[77, None], [77, None], [77, None]]
>
> which doesn't work as expected.
>
> any suggestions ?

>>> b = [[None, None] for i in range(3)]
>>> b[2][0] = 77
>>> b
[[None, None], [None, None], [77, None]]

If you don't understand why the other approach resulted in
[[77, None], [77, None], [77, None]], feel free to ask.  It's
a mistake that I think everybody makes at least once.

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


From gherron at digipen.edu  Thu Sep 15 13:24:15 2011
From: gherron at digipen.edu (Gary Herron)
Date: Thu, 15 Sep 2011 10:24:15 -0700
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
Message-ID: <4E7234BF.5030101@digipen.edu>

On 09/15/2011 09:40 AM, neeru K wrote:
> Dear Python Users,
> I am trying to write a code for visualization (raster plots and 
> peri-event time histogram) of time series electrophysiological data 
> using numpy, scipy and matlplotlib in python. I am importing the data 
> into list using loadtext command.
> I was curious if anyone is aware of a function in numpy that can 
> *extract a smaller list containing numbers from a larger list* given 
> the upper and lower limit of the values between which the smaller list 
> lies.
> Thank you in advance.
> Sincerely,
> niranjan
>
> -- 
> Niranjan Kambi
> Senior Research Fellow,
> Neeraj Lab,
> National Brain Research Centre,
> Manesar, Gurgaon-122050
> Haryana, INDIA
> Ph:+919818654846
> website:- 
> http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html
> email:- neuro.niru at nbrc.res.in <mailto:neuro.niru at nbrc.res.in>, 
> neuroniru at gmail.com <mailto:neuroniru at gmail.com>
>
Do mean to extract a sub-list from a list based on lower and upper 
indexes into the list?  Python has a standard notation for indicating 
sub-lists, and numpy implements them:

 >>> a = numpy.array(range(10))
 >>> a
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
 >>> a[3:6]
array([3, 4, 5])

If you mean something else, please be more specific, and we'll try again.

Gary Herron


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From howe.steven at gmail.com  Thu Sep 15 13:27:53 2011
From: howe.steven at gmail.com (GrayShark)
Date: Thu, 15 Sep 2011 12:27:53 -0500
Subject: From Python on Solaris to Python on LINUX
References: <mailman.1174.1316105102.27778.python-list@python.org>
Message-ID: <XcednakTT8gEqO_TnZ2dnUVZ_rCdnZ2d@iwvisp.com>

I think that was more of a version question the Kernel questin

1) you can install any and all versions python on a linux computer.
You just need you app to select the correct path, correct python 
interpret. Likely there many be some some drivers in /dev that are
not the same as in Solaris. But that shouldn't daunt you. 
So start by installing python2.3, then test and fix version by version
through python2.7. python3.0 might be a pretty be rewrite.

2) Try to pick a version of linux supported locally; likely SuSE, even 
though Novell/Attachmate owns it. SuSE seems popular in Europe.


On Thu, 15 Sep 2011 18:26:04 +0200, Philipp Hagemeister wrote:

>> What are the traps to be avoided?
> 
> Assuming you're not using any OS features (scan the code for "/dev" and
> "/proc"), the transition from Solaris to Linux will be seamless.
> 
> Your main problem will be the transition from the archaic Python 2.3 to
> a modern one. Luckily, all 2.x Pythons should be backwards-compatible.
> 
> In summary, your application should work just fine (although being
> written in 2.3, it's probably not as maintainable as a modern
> application would).
> 
>> What is the most recent version on LINUX?
> There are multiple Linux distributions which can differ quite a lot.
> debian, Ubuntu, and CentOS are popular ones. As you can see on
> http://www.debian.org/CD/ , the current debian version is 6.0. As you
> can't see at the moment on http://kernel.org/ , the current Linux kernel
> version is 3.0 (although most distribution will want to test the kernel
> and therefore include a slightly older one).
> 
> -- Philipp



From gherron at digipen.edu  Thu Sep 15 13:28:23 2011
From: gherron at digipen.edu (Gary Herron)
Date: Thu, 15 Sep 2011 10:28:23 -0700
Subject: how to make a nested list
In-Reply-To: <4E722E74.7030908@gmail.com>
References: <4E722E74.7030908@gmail.com>
Message-ID: <4E7235B7.4030207@digipen.edu>

On 09/15/2011 09:57 AM, Stef Mientki wrote:
> hello,
>
> I need a nested list, like this
>
> >>> A= [ [None,None], [None,None], [None, None] ]
> >>> A[2][0] =77
> >>> A
> [[None, None], [None, None], [77, None]]
>
>
> Because the list is much larger, I need a shortcut (ok I can use a for 
> loop)
> So I tried
> >>> B = 3 * [ [ None, None ]]
> >>> B[2][0] = 77
> >>> B
> [[77, None], [77, None], [77, None]]
>
> which doesn't work as expected.
>
> any suggestions ?
>
> thanks,
> Stef

A for loop to fill in the array would work, but list comprehension 
(which is really just an internal loop for filling an array) is probably 
more efficient, certainly less code, and arguably more Pythonic.

A = [ [None,None]  for i in range(1000) ]

Gary Herron


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From tim at akwebsoft.com  Thu Sep 15 13:38:16 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Thu, 15 Sep 2011 09:38:16 -0800
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
In-Reply-To: <20110915020242.GL4331@johnsons-web.com>
References: <20110914195044.GK4331@johnsons-web.com>
	<CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>
	<20110915020242.GL4331@johnsons-web.com>
Message-ID: <20110915173816.GM4331@johnsons-web.com>

* Tim Johnson <tim at akwebsoft.com> [110914 18:18]:
> * Chris Rebert <clp2 at rebertia.com> [110914 16:46]:
> > On Wed, Sep 14, 2011 at 12:50 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> > > I have written a class that uses ftplib.FTP as the parent.
> > > I need to reconcile the modified time of a workstation file with
> > > that same filename on a remote server.
> > > Let's say we have a file called '400.shtml'. I get the mtime on
> > > my workstation by
> > >>> os.path.getmtime('400.shtml')
> > > 1311648420.0
> > 
> > http://docs.python.org/library/os.path.html#os.path.getmtime
> > Your sample seems to be a typical Unix timestamp:
>  Yup. Needs to be converted to a timedate stamp, methinks.
> > http://en.wikipedia.org/wiki/Unix_time
>   I'll look at that tomorrow. Late here.  
> > > And I use
> > >>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
> > > '213 20110726004703'
>  
> > RFC 3659 - Extensions to FTP
> > Sec 3. File Modification Time (MDTM)
> > http://tools.ietf.org/html/rfc3659#section-3
> > 
> > (Note: Code 213 = File status response)
>   and '213 20110726004703'[4:] should give me
>   the string representation of the timedate stamp on the
>   remote file.
  FYI:  datetime.datetime.fromtimestamp(mod_time)
  Is probably what I was looking for. However, for my
  purposes - I'm going to take another approach.
  Every uploaded file is defined in an object stored on my
  workstationr:
  I will store the MDTM string after upload and then on the next
  upload, compare the stored string with the return value
  from ftp.sendcmd('MDTM ' + filename)
  Thanks for the input.
-- 
Tim 
tim at johnsons-web dot com or akwebsoft dot com
http://www.akwebsoft.com


From arnodel at gmail.com  Thu Sep 15 13:39:34 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Thu, 15 Sep 2011 18:39:34 +0100
Subject: cause __init__ to return a different class?
In-Reply-To: <45466810-5082-45bd-82d0-ba58a16c4289@t29g2000vby.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<mailman.1151.1316064930.27778.python-list@python.org>
	<45466810-5082-45bd-82d0-ba58a16c4289@t29g2000vby.googlegroups.com>
Message-ID: <CAJ6cK1ZzuBvW7YrdBOJEo3d8wvck1FnArkzrUCkQDAAt+WgMOA@mail.gmail.com>

On 15 September 2011 15:41, Matthew Pounsett <matt.pounsett at gmail.com> wrote:
> On Sep 15, 1:35?am, Chris Rebert <c... at rebertia.com> wrote:
>> Override __new__() instead:
>> http://docs.python.org/reference/datamodel.html#object.__new__
>
> Aha.. thanks! ?The reference book I'm working from neglects to mention
> __new__, so I'd assumed __init__ was the constructor. ?It hadn't
> occurred to me that python would separate the functions (I still don't
> see exactly why it would be useful to do that, but perhaps insight
> will come with time).

If you're interested in the reason, I suggest you read Guido's essay
on "new style classes" which were introduced in Python 2.2 (and are
now a good 10 years old I think):

    http://www.python.org/download/releases/2.2.3/descrintro

-- 
Arnaud


From ladasky at my-deja.com  Thu Sep 15 14:43:33 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 11:43:33 -0700 (PDT)
Subject: how to make a nested list
References: <mailman.1175.1316106277.27778.python-list@python.org>
Message-ID: <da67a480-1367-469f-ac0f-366220e34329@n11g2000yqh.googlegroups.com>

Stef,

Are your bottom-level lists always of length 2?  If so, then you could
use an array, instead of a list of lists.

Python ships with a module called array, but it doesn't allow you to
put non-numeric types into arrays, and it looks like you want the
NoneType.  I use the popular numpy module, which does allow non-
numeric types.

You might also like the slice notation that numpy uses for referencing
items in the array.  The indices go inside a single set of square
brackets, and are separated by commas.

>>> from numpy import empty
>>> B = empty((3,2), object)
>>> B
array([[None, None],
       [None, None],
       [None, None]], dtype=object)
>>> B[2,0] = 77
>>> B
array([[None, None],
       [None, None],
       [77, None]], dtype=object)


From tjreedy at udel.edu  Thu Sep 15 14:54:57 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 15 Sep 2011 14:54:57 -0400
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <1316063960.26516.140258141338017@webmail.messagingengine.com>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
Message-ID: <j4thm7$ikt$1@dough.gmane.org>

On 9/15/2011 1:19 AM, python at bdurham.com wrote:
> Is there a way to cancel or timeout a long running regular expression?
> I have a program that accepts regular expressions from users and I'm
> concerned about how to handle worst case regular expressions that seem
> to run forever. Ideally I'm looking for a way to evaluate a regular
> expression and timeout after a specified time period if the regular
> expression hasn't completed yet. Or a way for a user to cancel a long
> running regular expression.

This is a general problem when evaluating *any* expression from the 
outside. [0]*10000*10000 will eat space as well as time. At least, as 
far as I know, an re cannot cause a disk reformat ;-).

There have been previous discussions on this generally topic.

> I was thinking there might be a technique I could use to evaluate
> regular expressions in a thread or another process launched via
> multiprocessing module and then kill the thread/process after a
> specified timeout period.

Only solution I remember ever seen posted. I wonder if there are any 
heuristics for detecting exponential time re's.

 > My concern about the multiprocessing module
> technique is that launching a process for every regex evaluation sounds
> pretty inefficient. And I don't think the threading module supports the
> ability to kill threads from outside a thread itself.

-- 
Terry Jan Reedy



From neuroniru at gmail.com  Thu Sep 15 14:55:08 2011
From: neuroniru at gmail.com (neeru K)
Date: Fri, 16 Sep 2011 00:25:08 +0530
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <4E7234BF.5030101@digipen.edu>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
	<4E7234BF.5030101@digipen.edu>
Message-ID: <CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>

Dear Gary,
thank you for the reply.
I will be more specific and take the same example that you have given and
tell you what is my problem -
array([0.0, 1.3, 2.45, 3.87, 4.54, 5.11, 6.90, 7.78, 8.23, 9.01])
from this array I want to a sub-list with lower and upper indexes that are
not present in the above array for example - sub-list[3, 8]
Is there a function for this?
thank you
niranjan


On Thu, Sep 15, 2011 at 10:54 PM, Gary Herron <gherron at digipen.edu> wrote:

> On 09/15/2011 09:40 AM, neeru K wrote:
>
>> Dear Python Users,
>> I am trying to write a code for visualization (raster plots and peri-event
>> time histogram) of time series electrophysiological data using numpy, scipy
>> and matlplotlib in python. I am importing the data into list using loadtext
>> command.
>> I was curious if anyone is aware of a function in numpy that can *extract
>> a smaller list containing numbers from a larger list* given the upper and
>> lower limit of the values between which the smaller list lies.
>> Thank you in advance.
>> Sincerely,
>> niranjan
>>
>> --
>> Niranjan Kambi
>> Senior Research Fellow,
>> Neeraj Lab,
>> National Brain Research Centre,
>> Manesar, Gurgaon-122050
>> Haryana, INDIA
>> Ph:+919818654846
>> website:- http://www.nbrc.ac.in/faculty/**neeraj/Lab_webpage/Niranjan_**
>> Kambi.html<http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html>
>> email:- neuro.niru at nbrc.res.in <mailto:neuro.niru at nbrc.res.in**>,
>> neuroniru at gmail.com <mailto:neuroniru at gmail.com>
>>
>>  Do mean to extract a sub-list from a list based on lower and upper
> indexes into the list?  Python has a standard notation for indicating
> sub-lists, and numpy implements them:
>
> >>> a = numpy.array(range(10))
> >>> a
> array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
> >>> a[3:6]
> array([3, 4, 5])
>
> If you mean something else, please be more specific, and we'll try again.
>
> Gary Herron
>
>
> --
> Gary Herron, PhD.
> Department of Computer Science
> DigiPen Institute of Technology
> (425) 895-4418
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
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From wm at localhost.localdomain  Thu Sep 15 15:14:11 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Thu, 15 Sep 2011 21:14:11 +0200
Subject: Request for research feedback
References: <mailman.1172.1316103671.27778.python-list@python.org>
Message-ID: <1oxwvsczcdfj4$.dlg@localhost.localdomain>

On Thu, 15 Sep 2011 16:55:13 +0100, Fulvio Valente wrote:

> Hi, I am a research intern at the University of Strathclyde
> who has been doing a summer research internship.

I don't want to be rude, but please: could you rather first research
how to use a newsreader before you use it?
These long lines (a few times the limit of 78 characters per line)
make your post unreadable.

Thanks,
Waldek


From nagle at animats.com  Thu Sep 15 15:27:58 2011
From: nagle at animats.com (John Nagle)
Date: Thu, 15 Sep 2011 12:27:58 -0700
Subject: PC locks up with list operations
In-Reply-To: <mailman.599.1314794452.27778.python-list@python.org>
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.599.1314794452.27778.python-list@python.org>
Message-ID: <4e7251c1$0$1673$742ec2ed@news.sonic.net>

On 8/31/2011 5:40 AM, Chris Withers wrote:
> On 31/08/2011 13:33, Steven D'Aprano wrote:
>> I am using Linux desktops; both incidents were with Python 2.5. Do newer
>> versions of Python respond to this sort of situation more gracefully?
>
> Ironically, Windows does better here and dumps you out with a
> MemoryError before slowly recovering.
>
> Linux seems to fair badly when programs use more memory than physically
> available.

    Linux virtual memory has some known design problems.  For example,
you can crash many Linux systems with a program which opens large
files and accesses them randomly, combined with another program which
is spawning processes that need a fair amount of memory.  The disk
caching system tries to use all unused memory, and when process
startup is consuming pages, it's possible to get into a situation
where a page is needed, the task requesting it can't block, and
a lock preventing freeing a file cache page is set.

    Arguably, paging to disk is obsolete. RAM is too cheap and
disk is too slow.

					John Nagle


From ramit.prasad at jpmorgan.com  Thu Sep 15 16:11:13 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 15 Sep 2011 16:11:13 -0400
Subject: Request for research feedback
In-Reply-To: <1oxwvsczcdfj4$.dlg@localhost.localdomain>
References: <mailman.1172.1316103671.27778.python-list@python.org>
	<1oxwvsczcdfj4$.dlg@localhost.localdomain>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16CEFF05@EMARC112VS01.exchad.jpmchase.net>

I don't want to be rude but...

Rude:
>I don't want to be rude, but please: could you rather first research
>how to use a newsreader before you use it?
>These long lines (a few times the limit of 78 characters per line)
>make your post unreadable.

Not rude:
>These long lines (a few times the limit of 78 characters per line)
>make your post unreadable.

Sincerely,
Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From fulvio.valente at strath.ac.uk  Thu Sep 15 16:19:46 2011
From: fulvio.valente at strath.ac.uk (Fulvio Valente)
Date: Thu, 15 Sep 2011 21:19:46 +0100
Subject: Request for research feedback
In-Reply-To: <1oxwvsczcdfj4$.dlg@localhost.localdomain>
References: <mailman.1172.1316103671.27778.python-list@python.org>
	<1oxwvsczcdfj4$.dlg@localhost.localdomain>
Message-ID: <4E725DE2.7050704@strath.ac.uk>

Whoops, I thought the rather iffy Exchange web client at my institution 
would've wrapped outgoing messages automatically. I'm now using a proper 
client for that account which should prevent such issues in the future. 
Thanks for the heads up.

For anyone who couldn't stand to read the original message, a fixed 
version is at http://geeksoc.org/~fvalente/jimmy/request.txt (figured 
it'd be rude to repost it directly in this message).

On 15/09/2011 20:14, Waldek M. wrote:
> On Thu, 15 Sep 2011 16:55:13 +0100, Fulvio Valente wrote:
>
>> Hi, I am a research intern at the University of Strathclyde
>> who has been doing a summer research internship.
>
> I don't want to be rude, but please: could you rather first research
> how to use a newsreader before you use it?
> These long lines (a few times the limit of 78 characters per line)
> make your post unreadable.
>
> Thanks,
> Waldek

-- 
Regards,
- Fulvio


From ladasky at my-deja.com  Thu Sep 15 16:52:45 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 13:52:45 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
Message-ID: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>

Suppose that I have a multi-core computer with N CPU's, and I create a
multiprocessing.Pool in Python 2.6 with N-1 Processes.

(My rationale for choosing N-1 Processes was discussed here:
http://groups.google.com/group/comp.lang.python/browse_frm/thread/65ba3ccd4be8228c)

Then I use Pool.map_async() to break up a long-running task T1 into M
chunks, where M > 2N.

Suppose that I have a second, parallelizable, long-running task T2
that I want to address in REAL TIME when the need arises.  Using Pool,
is there a way for me to insert the chunks of T2 at the HEAD of the
task queue, instead of at its TAIL?

I've been snooping around inside Pool, and I would guess that what I
want to do is to manipulate Pool._inqueue, which is a
multiprocessing.queues.SimpleQueue object.  I haven't found any
documentation for SimpleQueue.  It appears to have only the most
rudimentary of public methods -- put, get, and empty.

Reading further, I can see that multiprocessing.Queue (not the same as
SimpleQueue) has put_nowait(), which looks like what I need.  Assuming
that I had access to put_nowait(), then I would need an option in
map_async() which would invoke put_nowait() rather than just plain
put().

Does anyone know of an efficient way to accomplish this?  I'm thinking
that a subclass of Pool which replaces the SimpleQueue with a full-
fledged Queue, and which overrides map_async() allowing for a no-wait
task, would be very useful... but maybe I'm re-inventing the wheel.
Thanks for your advice!


From ladasky at my-deja.com  Thu Sep 15 17:49:53 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 14:49:53 -0700 (PDT)
Subject: Accessing matplotlib-users discussion group?
References: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>
Message-ID: <d20cc76c-5ba6-4311-8459-0327134c8c49@u10g2000yqk.googlegroups.com>

Hate to bump this, but... I found Sourceforge's IRC, and tried to ask
for help there, and it doesn't look like I can get any help until
business hours tomorrow.  Anyone?


From vlastimil.brom at gmail.com  Thu Sep 15 18:02:10 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 16 Sep 2011 00:02:10 +0200
Subject: how to make a nested list
In-Reply-To: <4E722E74.7030908@gmail.com>
References: <4E722E74.7030908@gmail.com>
Message-ID: <CAHzaPENKcwyDnyDfMZppEiPyG6s-b3oyziduswD4b7waAjQdbQ@mail.gmail.com>

2011/9/15 Stef Mientki <stef.mientki at gmail.com>:
> hello,
>
> I need a nested list, like this
>
>>>> A= [ [None,None], [None,None], [None, None] ]
>>>> A[2][0] =77
>>>> A
> [[None, None], [None, None], [77, None]]
> ...
>
> thanks,
> Stef
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Besides the above sugestions to correct the nested list approach,
if you need to set and access the data at the given "coordinates" you
could also use a nested defaultdict, which doesn't need to be
pre-filled before setting, e.g.:

>>> from collections import defaultdict as dd
>>> def dd_dd():
...     return dd(dd)
...
>>> dd_matrix = dd(dd_dd)
>>>
>>> dd_matrix[2][0] = 77
>>> dd_matrix[2][0]
77
>>> dd_matrix
defaultdict(<function dd_dd at 0x04E5B8B0>, {2: defaultdict(<type
'collections.defaultdict'>, {0: 77})})
>>>

However, the nested list are concise enough, I guess.

Regards,
   vbr


From rosuav at gmail.com  Thu Sep 15 18:14:00 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:14:00 +1000
Subject: multiprocessing.Pool, its queue, and pre-emption
In-Reply-To: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
Message-ID: <CAPTjJmoQ1gAmaQkBCYkyAAwge7VEZSztwrSys5+aKWCEeKJA5Q@mail.gmail.com>

On Fri, Sep 16, 2011 at 6:52 AM, John Ladasky <ladasky at my-deja.com> wrote:
> Suppose that I have a second, parallelizable, long-running task T2
> that I want to address in REAL TIME when the need arises. ?Using Pool,
> is there a way for me to insert the chunks of T2 at the HEAD of the
> task queue, instead of at its TAIL?
>

That's a self-contradiction there. Even if you insert a task into the
head of the queue, it won't be addressed in real time; the only way to
do that would be to have a dedicated process, always ready to handle
the real-time events, or else some kind of interrupt system.

But if you just want them handled when there's a worker available,
what you're after is a priority queue system. I don't know if one
exists in Python already or not, but if not, it'd be a worthwhile
addition.

ChrisA


From rosuav at gmail.com  Thu Sep 15 18:22:42 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:22:42 +1000
Subject: how to make a nested list
In-Reply-To: <CAHzaPENKcwyDnyDfMZppEiPyG6s-b3oyziduswD4b7waAjQdbQ@mail.gmail.com>
References: <4E722E74.7030908@gmail.com>
	<CAHzaPENKcwyDnyDfMZppEiPyG6s-b3oyziduswD4b7waAjQdbQ@mail.gmail.com>
Message-ID: <CAPTjJmrTHe_jBw19O13bx2Xa__ELkZDX=dpWdmezcV8i39XrAw@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:02 AM, Vlastimil Brom
<vlastimil.brom at gmail.com> wrote:
> Besides the above sugestions to correct the nested list approach,
> if you need to set and access the data at the given "coordinates" you
> could also use a nested defaultdict...

The defaultdict is efficient for a sparse matrix, but I suspect that
it'd be rather worse if you use all the elements.

ChrisA


From gherron at digipen.edu  Thu Sep 15 18:25:18 2011
From: gherron at digipen.edu (Gary Herron)
Date: Thu, 15 Sep 2011 15:25:18 -0700
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>	<4E7234BF.5030101@digipen.edu>
	<CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>
Message-ID: <4E727B4E.4000400@digipen.edu>

On 09/15/2011 11:55 AM, neeru K wrote:
> Dear Gary,
> thank you for the reply.
> I will be more specific and take the same example that you have given 
> and tell you what is my problem -
> array([0.0, 1.3, 2.45, 3.87, 4.54, 5.11, 6.90, 7.78, 8.23, 9.01])
> from this array I want to a sub-list with lower and upper indexes that 
> are not present in the above array for example - sub-list[3, 8]
> Is there a function for this?
> thank you
> niranjan

You say "index", but I think that is not what you mean.  An index is in 
integer referring to an element's position in the array.   The "value" 
at an index is what I believe you are referring to.

Nevertheless, I think list comprehension is what you want:
     [ x  for x in A  if 3.0 <= x <= 8.0 ]
will extract all the values between 3 and 8 from the array A and create 
a new list containing them.

If you want the new list to be a numpy array then
     numpy.array([ x  for x in A  if 3.0 <= x <= 8.0 ])



>
>
> On Thu, Sep 15, 2011 at 10:54 PM, Gary Herron <gherron at digipen.edu 
> <mailto:gherron at digipen.edu>> wrote:
>
>     On 09/15/2011 09:40 AM, neeru K wrote:
>
>         Dear Python Users,
>         I am trying to write a code for visualization (raster plots
>         and peri-event time histogram) of time series
>         electrophysiological data using numpy, scipy and matlplotlib
>         in python. I am importing the data into list using loadtext
>         command.
>         I was curious if anyone is aware of a function in numpy that
>         can *extract a smaller list containing numbers from a larger
>         list* given the upper and lower limit of the values between
>         which the smaller list lies.
>         Thank you in advance.
>         Sincerely,
>         niranjan
>
>         -- 
>         Niranjan Kambi
>         Senior Research Fellow,
>         Neeraj Lab,
>         National Brain Research Centre,
>         Manesar, Gurgaon-122050
>         Haryana, INDIA
>         Ph:+919818654846 <tel:%2B919818654846>
>         website:-
>         http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html
>         email:- neuro.niru at nbrc.res.in <mailto:neuro.niru at nbrc.res.in>
>         <mailto:neuro.niru at nbrc.res.in
>         <mailto:neuro.niru at nbrc.res.in>>, neuroniru at gmail.com
>         <mailto:neuroniru at gmail.com> <mailto:neuroniru at gmail.com
>         <mailto:neuroniru at gmail.com>>
>
>     Do mean to extract a sub-list from a list based on lower and upper
>     indexes into the list?  Python has a standard notation for
>     indicating sub-lists, and numpy implements them:
>
>     >>> a = numpy.array(range(10))
>     >>> a
>     array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
>     >>> a[3:6]
>     array([3, 4, 5])
>
>     If you mean something else, please be more specific, and we'll try
>     again.
>
>     Gary Herron
>
>
>     -- 
>     Gary Herron, PhD.
>     Department of Computer Science
>     DigiPen Institute of Technology
>     (425) 895-4418 <tel:%28425%29%20895-4418>
>
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
>
>
>
>
>
>


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From ladasky at my-deja.com  Thu Sep 15 18:25:49 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 15:25:49 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
Message-ID: <80a631d9-9f5b-40bc-91a1-7657d5fc271a@w21g2000yql.googlegroups.com>

On Sep 15, 3:14?pm, Chris Angelico <ros... at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 6:52 AM, John Ladasky <lada... at my-deja.com> wrote:
> > Suppose that I have a second, parallelizable, long-running task T2
> > that I want to address in REAL TIME when the need arises. ?Using Pool,
> > is there a way for me to insert the chunks of T2 at the HEAD of the
> > task queue, instead of at its TAIL?
>
> That's a self-contradiction there. Even if you insert a task into the
> head of the queue, it won't be addressed in real time; the only way to
> do that would be to have a dedicated process, always ready to handle
> the real-time events, or else some kind of interrupt system.
>
> But if you just want them handled when there's a worker available,
> what you're after is a priority queue system. I don't know if one
> exists in Python already or not, but if not, it'd be a worthwhile
> addition.
>
> ChrisA

Hi, Chris,

Sorry if I'm not quite familiar with the proper terminology for
queues.  Let me try to define what I need as precisely as I can.

1) I aim to keep all five child Processes as busy as possible at all
times, crunching numbers.

2) I break my data for the low-priority task, T1, into large enough
chunks to benefit from multiprocessing, but small enough so that any
given Process should become available fairly frequently -- say, every
50 milliseconds.  Starting 50 milliseconds late would be close enough
to "real time" for my purposes.

3) But let's say that T1 still has twenty chunks in the Process queue
when T2 comes along.  I could be waiting 300 milliseconds for the
queue to empty.  If I could just ensure that T2 gets the next
available Processes, I would be happy.  Since T2 is also
parallelizable and I am using five child Processes, I would divide T2
into exactly five chunks.  These chunks should get inserted at
positions 0-4 in the queue rather than at 20-24.  T2 would briefly
commandeer all five Processes and then clear out.

If that's not putting T2 at the head of the queue, I guess I don't
know a better way to describe it.


From ladasky at my-deja.com  Thu Sep 15 18:32:43 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 15:32:43 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
Message-ID: <500f0c1f-fa8d-4f54-b1be-f0310ae347b3@1g2000vbu.googlegroups.com>

Ah. Now, see?  Having the right vocabulary helps.  Searching for
"priority queue" brings up this discussion from back in January:

http://groups.google.com/group/comp.lang.python/browse_frm/thread/b69aeced28634898

Now, this discussion refers to a PriorityPool class which doesn't
appear to be a standard part of Python (2.6, anyway).  But I'm not the
first one to ask the question, and there's code out there.


From rosuav at gmail.com  Thu Sep 15 18:32:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:32:53 +1000
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <j4thm7$ikt$1@dough.gmane.org>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<j4thm7$ikt$1@dough.gmane.org>
Message-ID: <CAPTjJmoLDVM7ocJy+vuZyzX8eVoL0kA_j7Q9tGwGgG=QFxrq5w@mail.gmail.com>

On Fri, Sep 16, 2011 at 4:54 AM, Terry Reedy <tjreedy at udel.edu> wrote:
> On 9/15/2011 1:19 AM, python at bdurham.com wrote:
>> I was thinking there might be a technique I could use to evaluate
>> regular expressions in a thread or another process launched via
>> multiprocessing module and then kill the thread/process after a
>> specified timeout period.
>
> Only solution I remember ever seen posted.

Then here's a minor refinement. Since long-running RE is the
exceptional case, optimize for the other. Keep the process around and
feed it all the jobs you get, and on problem, kill and respawn. That
way, you pay most of the overhead cost only when you make use of the
separation. (There's still some IPC overhead of course. Can't escape
that.)

ChrisA


From rosuav at gmail.com  Thu Sep 15 18:35:20 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:35:20 +1000
Subject: multiprocessing.Pool, its queue, and pre-emption
In-Reply-To: <80a631d9-9f5b-40bc-91a1-7657d5fc271a@w21g2000yql.googlegroups.com>
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
	<80a631d9-9f5b-40bc-91a1-7657d5fc271a@w21g2000yql.googlegroups.com>
Message-ID: <CAPTjJmrjB-2y4R4dO2qu9Ly8ovOrKGuX_qFw+VC+-xXQR+9-hw@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:25 AM, John Ladasky <ladasky at my-deja.com> wrote:
> Starting 50 milliseconds late would be close enough
> to "real time" for my purposes.
> ...
>
> If that's not putting T2 at the head of the queue, I guess I don't
> know a better way to describe it.

Yep, your terms are correct, with that caveat ("immediate" or "urgent"
without being "real-time"). So you're definitely looking for a
priority queue.

It may be possible to patch a different queue object straight into
Pool, but I've never done anything like that. It's probably best to
dig in the code and add an option somewhere to pass in a queue object
- that'd be a very useful feature imho.

ChrisA


From rosuav at gmail.com  Thu Sep 15 18:52:46 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:52:46 +1000
Subject: multiprocessing.Pool, its queue, and pre-emption
In-Reply-To: <500f0c1f-fa8d-4f54-b1be-f0310ae347b3@1g2000vbu.googlegroups.com>
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
	<500f0c1f-fa8d-4f54-b1be-f0310ae347b3@1g2000vbu.googlegroups.com>
Message-ID: <CAPTjJmrBCdg+qAivuwW4KPVYKdbRJ0UcLWRQmQ6t2_3qOLUrGA@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:32 AM, John Ladasky <ladasky at my-deja.com> wrote:
> Ah. Now, see? ?Having the right vocabulary helps. ?Searching for
> "priority queue" brings up this discussion from back in January:
>
> http://groups.google.com/group/comp.lang.python/browse_frm/thread/b69aeced28634898
>
> Now, this discussion refers to a PriorityPool class which doesn't
> appear to be a standard part of Python (2.6, anyway). ?But I'm not the
> first one to ask the question, and there's code out there.

Awesome! I wasn't aware of that (although considering the volume of
traffic on this list, I doubt there's any human who knows everything
that's been discussed). Previously-solved problems save everyone a lot
of trouble.

ChrisA


From cs at zip.com.au  Thu Sep 15 18:54:40 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 16 Sep 2011 08:54:40 +1000
Subject: From Python on Solaris to Python on LINUX
In-Reply-To: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
References: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
Message-ID: <20110915225440.GA26026@cskk.homeip.net>

On 15Sep2011 17:30, Genevi?ve Diagorn <Genevieve.Diagorn at open-groupe.com> wrote:
| I work on projects developed in Python 2.3 on Solaris. The customer asks us
| to pass on LINUX in a recent version of Python.
| 
| Is it someone has already realized this modification? What are the traps to
| be avoided?
| 
| Is it a long and difficult phase?

Aside from the very minor things mentioned by others, only two things
occur to me:

  - if you use the struct module and you're moving from SPARC to Intel the
    endianness of some things may change

  - if you call external shell commands, there are (usually minor)
    differences between the Solaris and GNU toolsets

Neither seems likely to be a big problem and of course both are "outside
Python" in a sense. Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Do not taunt Happy Fun Coder.


From ramit.prasad at jpmorgan.com  Thu Sep 15 19:16:05 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 15 Sep 2011 19:16:05 -0400
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <4E727B4E.4000400@digipen.edu>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
	<4E7234BF.5030101@digipen.edu>
	<CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>
	<4E727B4E.4000400@digipen.edu>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16CF01B7@EMARC112VS01.exchad.jpmchase.net>

>Nevertheless, I think list comprehension is what you want:
>     [ x  for x in A  if 3.0 <= x <= 8.0 ]
>will extract all the values between 3 and 8 from the array A and create 
>a new list containing them.

>If you want the new list to be a numpy array then
>     numpy.array([ x  for x in A  if 3.0 <= x <= 8.0 ])


I have been told that the following is much faster than list generation for filtering if you are using numpy arrays. I have not looked to see if this claim is accurate, but since it was one of the SciPy creators....I trust him :) YMMV

foo = numpy.array([
	[1.2,2.3,1.3],
	[4.3,2.1,6.2],
	[3.2,1.2,6.5],
	[1.4,2.1,4.3]])
#if we want 2nd element > 2 and 3rd element < 6
mask = (foo[:,2]>2)&(foo[:,2]<6)
v = foo[mask] #this is a view and if you want a new list, you will have to wrap it
# I assume np.array(v) will create new array (untested).

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From sohel807 at gmail.com  Fri Sep 16 00:48:30 2011
From: sohel807 at gmail.com (Akand Islam)
Date: Thu, 15 Sep 2011 21:48:30 -0700 (PDT)
Subject: Comparisons of computation timing
Message-ID: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>

I have run my codes (written in Python) in my Notebook (3 GB Ram, Dual-
core CPU T4500 @ 2.3 GHz) and in my lab machine (11.57 GB Ram, i7-920
CPU @ 2.67 GHz). However, I have found execution time in Notebook
250.3 seconds, and in Lab machine 333.2 seconds. How is it possible?
Good configuration machine performs slower??? I reran the codes, same
finding whatsoever. I run Windows 7 in my laptop, and Ubuntu 11.04 in
lab machine. Both are 64 bit. When I ran my simulation in Notebook, I
also did some other stuffs; however for the case of lab machine I did
nothing other than running simulation only.

About the codes: Basically it simply solves some non-linear equations
using "fsolve" along with some other calculations.

I will appreciate if some one discusses about possible reasons? For
fair comparisons, in both machines I ran exactly the same codes. My
codes are not parallelized, is this the main reason i7 processes show
slower performance?

Thanks in advance,
Akand


From wm at localhost.localdomain  Fri Sep 16 01:46:52 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Fri, 16 Sep 2011 07:46:52 +0200
Subject: Request for research feedback
References: <mailman.1172.1316103671.27778.python-list@python.org>
	<1oxwvsczcdfj4$.dlg@localhost.localdomain>
	<mailman.1183.1316117489.27778.python-list@python.org>
Message-ID: <1drj37uduixks$.dlg@localhost.localdomain>

On Thu, 15 Sep 2011 16:11:13 -0400, Prasad, Ramit wrote:
> I don't want to be rude but...
> Not rude:
> Rude:

You're right. I must have gotten a few bad habits I didn't
even realize. Thanks.

Waldek


From ladasky at my-deja.com  Fri Sep 16 02:31:49 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 23:31:49 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
Message-ID: <cc4b4a8d-4fa9-4377-b0d1-7b1d25d23a7b@cd4g2000vbb.googlegroups.com>

On Sep 15, 1:52?pm, John Ladasky <lada... at my-deja.com> wrote:
> I've been snooping around inside Pool, and I would guess that what I
> want to do is to manipulate Pool._inqueue, which is a
> multiprocessing.queues.SimpleQueue object. ?I haven't found any
> documentation for SimpleQueue. ?It appears to have only the most
> rudimentary of public methods -- put, get, and empty.

Reading more deeply, I think that my first guess was incorrect.
There's also Pool._taskqueue, and it's a full-fledged Queue.  It
appears that map.async() puts pending jobs there, not in
Pool._inqueue.

If this is true, then all that should have to be done is to override a
few methods.  I'm going to try it.


From chunuan723 at gmail.com  Fri Sep 16 02:39:23 2011
From: chunuan723 at gmail.com (he sharon)
Date: Thu, 15 Sep 2011 23:39:23 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <43895317-a79b-44ef-b85e-9adccd37309a@i5g2000vbw.googlegroups.com>

our products:

red bull hats:  http://www.popbaseballhats.com/wholesale-113-b0-Red-Bull-Hats.html

red bull beanies: http://www.popbaseballhats.com/wholesale-112-b0-Red-Bull-Beanies.html

red bull t shirts: http://www.popbaseballhats.com/wholesale-114-b0-Red-Bull-T-Shirts.html

monster energy hats:
http://www.popbaseballhats.com/wholesale-100-b0-Monster-Energy-Hats.html

monster energy t shirts:
http://www.popbaseballhats.com/wholesale-101-b0-Monster-Energy-T-Shirts.html

and so on. on our site: www.popbaseballhats.com


From 1248283536 at qq.com  Fri Sep 16 02:39:28 2011
From: 1248283536 at qq.com (=?utf-8?B?YWxpYXM=?=)
Date: Fri, 16 Sep 2011 14:39:28 +0800
Subject: parse  html:what is the meaning of "//"?
Message-ID: <tencent_72532068286D43F3549C09BB@qq.com>

code1:
import lxml.html
import urllib
down='http://finance.yahoo.com/q/op?s=C+Options'
content=urllib.urlopen(down).read()
root=lxml.html.document_fromstring(content)
table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
tds=table.xpath("tr[@valign='top']//td")
for  td  in tds:
    print  td.text_content()

what i get is :
Call Options
Expire at close Friday, September 16, 2011
these are waht i want.

code2
import lxml.html
 import urllib
 down='http://finance.yahoo.com/q/op?s=C+Options'
 content=urllib.urlopen(down).read()
 root=lxml.html.document_fromstring(content)
 table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
 tds=table.xpath("//tr[@valign='top']//td")
 for  td  in tds:
     print  td.text_content()

what i get is :
N/A
N/A
2
114
48.00
C110917P00048000
16.75
 0.00
N/A
N/A
0
23
50.00
C110917P00050000
23.16
 0.00
N/A
N/A
115
2,411
   
   
   
Highlighted options are in-the-money.
(omit  something)
there is only one difference between   code1 and code2  :
in code1 is :   tds=table.xpath("tr[@valign='top']//td")
in code2 is:   tds=table.xpath("//tr[@valign='top']//td")

i want to know  why  the  "//"  make output  different?
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From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Fri Sep 16 03:01:39 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Fri, 16 Sep 2011 09:01:39 +0200
Subject: Turkic I and re
In-Reply-To: <mailman.1163.1316092594.27778.python-list@python.org>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<mailman.1163.1316092594.27778.python-list@python.org>
Message-ID: <j4usl8$jel$1@r03.glglgl.eu>

Am 15.09.2011 15:16 schrieb Alan Plum:

> The Turkish 'I' is a peculiarity that will probably haunt us programmers
> until hell freezes over.

That's why it would have been nice if the Unicode guys had defined "both 
Turkish i-s" at separate codepoints.

Then one could have the three pairs
I, i ("normal")
I (other one), ?

and

?, i (the other one).

But alas, they haven't.


Thomas


From steve+comp.lang.python at pearwood.info  Fri Sep 16 03:19:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 16 Sep 2011 17:19:05 +1000
Subject: Comparisons of computation timing
References: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>
Message-ID: <4e72f86a$0$29976$c3e8da3$5496439d@news.astraweb.com>

Akand Islam wrote:

> I have run my codes (written in Python) in my Notebook (3 GB Ram, Dual-
> core CPU T4500 @ 2.3 GHz) and in my lab machine (11.57 GB Ram, i7-920
> CPU @ 2.67 GHz). However, I have found execution time in Notebook
> 250.3 seconds, and in Lab machine 333.2 seconds. How is it possible?
> Good configuration machine performs slower??? I reran the codes, same
> finding whatsoever. I run Windows 7 in my laptop, and Ubuntu 11.04 in
> lab machine. Both are 64 bit. When I ran my simulation in Notebook, I
> also did some other stuffs; however for the case of lab machine I did
> nothing other than running simulation only.

In a modern, multi-processing operating system like Windows, Mac OS or
Linux, you can *never* run only the simulation. There are always other
processes running. Even if you have no other applications running, the
system itself could have dozens or hundreds of processes running in the
background. On one of my Linux systems, a desktop running about four
applications, I have over two hundred processes:

[steve at orac ~]$ ps aux | wc -l
218

Without knowing more about the two systems, and the code you ran, it is
impossible to say why one is faster than the other. Your question is like
this:

"I drove from home to work with an old Toyota, and it took twenty minutes.
Then the next day, I borrowed my cousin's brand new Ferrari, and the same
journey took thirty minutes. How is this possible?"

On the Ubuntu machine, what does "ulimit -a" report? How does that compare
to the Window machine? Where there any cron jobs running at the time? Did
your Ubuntu system decide that this was a good time to download a whole lot
of system updates? Can you use the "nice" command to run at a higher
priority? Is your code limited by CPU, memory or disk I/O? Which desktop
environment is your Ubuntu system running, Gnome, Unity, KDE, Ratpoison, or
something else?

There could be dozens of factors that make a difference to speed.


> About the codes: Basically it simply solves some non-linear equations
> using "fsolve" along with some other calculations.

What is "fsolve"?



> I will appreciate if some one discusses about possible reasons? For
> fair comparisons, in both machines I ran exactly the same codes. My
> codes are not parallelized, is this the main reason i7 processes show
> slower performance?

Don't believe hardware manufacturer's advertising. These days, chip speed is
not so important. Cache misses are MUCH more critical: a slow chip with a
big cache will out-perform a fast chip with a small cache nearly always.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Fri Sep 16 03:25:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 16 Sep 2011 17:25:39 +1000
Subject: Turkic I and re
References: <4E71F763.2010109@mrabarnett.plus.com>
	<mailman.1163.1316092594.27778.python-list@python.org>
	<j4usl8$jel$1@r03.glglgl.eu>
Message-ID: <4e72f9f4$0$30003$c3e8da3$5496439d@news.astraweb.com>

Thomas Rachel wrote:

> Am 15.09.2011 15:16 schrieb Alan Plum:
> 
>> The Turkish 'I' is a peculiarity that will probably haunt us programmers
>> until hell freezes over.


Meh, I don't think it's much more peculiar that any other diacritic issue.
If I'm German or English, I probably want ? and O to match during
case-insensitive comparisons, so that Z?e and ZOE match. If I'm Icelandic,
I don't. I don't really see why Turkic gets singled out.


> That's why it would have been nice if the Unicode guys had defined "both
> Turkish i-s" at separate codepoints.
> 
> Then one could have the three pairs
> I, i ("normal")
> I (other one), ?
> 
> and
> 
> ?, i (the other one).

And then people will say, "How can I match both sorts of dotless uppercase I
but not dotted I when I'm doing comparisons?"



-- 
Steven



From nizamov.shawkat at gmail.com  Fri Sep 16 03:30:01 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Fri, 16 Sep 2011 09:30:01 +0200
Subject: Comparisons of computation timing
In-Reply-To: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>
References: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>
Message-ID: <CAFwQ1Ss6OwysHCxO=qC02BzG1J4FJJfG_N=z9cBF2h7i2Tb-Cg@mail.gmail.com>

> About the codes: Basically it simply solves some non-linear equations
> using "fsolve" along with some other calculations.
>

Looks like you are using some third party libraries like numpy/scipy.
Do these libraries have the same version on both platforms?
What about python interpreter versions - are they the same?

Best regards,
Shavkat Nizamov


From johnjohn.tedro at gmail.com  Fri Sep 16 04:00:16 2011
From: johnjohn.tedro at gmail.com (John-John Tedro)
Date: Fri, 16 Sep 2011 08:00:16 +0000
Subject: Fwd: Turkic I and re
In-Reply-To: <CAJPn68RYjovir_WKBBiaaim3_0AAT86KECXQ_=_2x5VE+a4fhw@mail.gmail.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<mailman.1163.1316092594.27778.python-list@python.org>
	<j4usl8$jel$1@r03.glglgl.eu>
	<4e72f9f4$0$30003$c3e8da3$5496439d@news.astraweb.com>
	<CAJPn68RYjovir_WKBBiaaim3_0AAT86KECXQ_=_2x5VE+a4fhw@mail.gmail.com>
Message-ID: <CAJPn68RS+7xOJhjqo-UX1QhudbuiVO-dsvMixBPGFKnOHP5Sog@mail.gmail.com>

On Fri, Sep 16, 2011 at 7:25 AM, Steven D'Aprano <
steve+comp.lang.python at pearwood.info> wrote:

> Thomas Rachel wrote:
>
> > Am 15.09.2011 15:16 schrieb Alan Plum:
> >
> >> The Turkish 'I' is a peculiarity that will probably haunt us programmers
> >> until hell freezes over.
>
>
> Meh, I don't think it's much more peculiar that any other diacritic issue.
> If I'm German or English, I probably want ? and O to match during
> case-insensitive comparisons, so that Z?e and ZOE match. If I'm Icelandic,
> I don't. I don't really see why Turkic gets singled out.
>
>
> > That's why it would have been nice if the Unicode guys had defined "both
> > Turkish i-s" at separate codepoints.
> >
> > Then one could have the three pairs
> > I, i ("normal")
> > I (other one), ?
> >
> > and
> >
> > ?, i (the other one).
>
> And then people will say, "How can I match both sorts of dotless uppercase
> I
> but not dotted I when I'm doing comparisons?"
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Yeah, it's more probable that language conventions and functions grow around
characters that look right.

No one except developers care what specific codepoint they have, so soon you
would have a mish-mash of special rules converting between each special
case.

P.S. Sorry Steven, i missed clicking "reply to all".

-- John-John Tedro
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From keobox at gmail.com  Fri Sep 16 05:30:08 2011
From: keobox at gmail.com (keobox)
Date: Fri, 16 Sep 2011 02:30:08 -0700 (PDT)
Subject: why ps/fname of a python interpreter changes across platforms?
Message-ID: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>

Hello,
I'm writing a little supervisor of some python scripts.
To check if the scrips are running I'm using the ps -o pid,fname
command on both RH Linux and solaris 10.
All the scripts are launched using "python script.py" command, they
are not launched with exec permissions.

I don't know why the fname of the python interpreter changes across
platforms.

I saw a "isapytho" in some solaris 10 platforms.
I saw "python2." in some Linux platforms.
On most platforms the value is "python".
Why?

Ok, I know that I can easily work around the problem by not using
"fname" and parse the ps output in another way, but I don't understand
how is possible that the combination of ps and python behaves so
badly.
Any idea?

Regards,
Cesare


From kevin.p.dwyer at gmail.com  Fri Sep 16 07:01:14 2011
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Fri, 16 Sep 2011 12:01:14 +0100
Subject: parse  html:what is the meaning of "//"?
References: <tencent_72532068286D43F3549C09BB@qq.com>
Message-ID: <j4va9r$m6r$1@dough.gmane.org>

alias wrote:

<snip>
>    
>    
>    
> Highlighted options are in-the-money.
> (omit  something)
> there is only one difference between   code1 and code2  :
> in code1 is :   tds=table.xpath("tr[@valign='top']//td")
> in code2 is:   tds=table.xpath("//tr[@valign='top']//td")
> 
> i want to know  why  the  "//"  make output  different?


This is an XPATH question, not really Python-related.

See http://www.w3schools.com/xpath/xpath_syntax.asp

Cheers,

Kev



From stefan_ml at behnel.de  Fri Sep 16 07:02:06 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 16 Sep 2011 13:02:06 +0200
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <tencent_72532068286D43F3549C09BB@qq.com>
References: <tencent_72532068286D43F3549C09BB@qq.com>
Message-ID: <j4vabe$njo$1@dough.gmane.org>

alias, 16.09.2011 08:39:
> code1:
> import lxml.html
> import urllib
> down='http://finance.yahoo.com/q/op?s=C+Options'
> content=urllib.urlopen(down).read()
> root=lxml.html.document_fromstring(content)

I see this quite often, but many people don't know that this can be 
simplified to

     import lxml.html
     url = 'http://finance.yahoo.com/q/op?s=C+Options'
     root = lxml.html.parse(url).getroot()

which is less code, but substantially more efficient.


> table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
> tds=table.xpath("tr[@valign='top']//td")
> for  td  in tds:
>      print  td.text_content()
>
> what i get is :
> Call Options
> Expire at close Friday, September 16, 2011
> these are waht i want.
>
> code2
> import lxml.html
>   import urllib
>   down='http://finance.yahoo.com/q/op?s=C+Options'
>   content=urllib.urlopen(down).read()
>   root=lxml.html.document_fromstring(content)
>   table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
>   tds=table.xpath("//tr[@valign='top']//td")

Here, you are looking for all "tr" tags in the table recursively, instead 
of taking just the ones that are direct children of the "table" tag.

That's what "//" is there for, it's a recursive subtree selector. You might 
want to read up on XPath expressions.


> what i get is :
> N/A
> N/A
> 2
> 114
> 48.00
> C110917P00048000
> 16.75
>   0.00
> N/A
> N/A
> 0
> 23
> 50.00
> C110917P00050000
> 23.16
>   0.00
> N/A
> N/A
> 115
> 2,411
>
>
> Highlighted options are in-the-money.

I don't see any highlighting in your text above, and I don't know what you 
mean by "in-the-money".

Stefan



From andrea.crotti.0 at gmail.com  Fri Sep 16 07:13:15 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 16 Sep 2011 12:13:15 +0100
Subject: create a directory structure
Message-ID: <4E732F4B.3090409@gmail.com>

I would like to write a program which creates a directory structure and 
fills in a few templated fields some values passed in as arguments.

So for example
create_struct.py

might create
base_dir:
|_ sub_dir1:
    |_ sub_file1
...

It's quite simple in theory, but I would also like to make it very 
easily maintanable, for example with a nice representation of the 
structure (an INI file maybe).

Any ideas/advise on how to make it easy to write and to maintain?


From steve+comp.lang.python at pearwood.info  Fri Sep 16 07:13:43 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 16 Sep 2011 21:13:43 +1000
Subject: why ps/fname of a python interpreter changes across platforms?
References: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>
Message-ID: <4e732f68$0$29997$c3e8da3$5496439d@news.astraweb.com>

keobox wrote:

> Hello,
> I'm writing a little supervisor of some python scripts.
> To check if the scrips are running I'm using the ps -o pid,fname
> command on both RH Linux and solaris 10.
> All the scripts are launched using "python script.py" command, they
> are not launched with exec permissions.
> 
> I don't know why the fname of the python interpreter changes across
> platforms.

Ask the person who built the system, or the people who made the
distribution. They are free to name the Python executable anything they
like.



-- 
Steven



From yasar11732 at gmail.com  Fri Sep 16 07:34:37 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Fri, 16 Sep 2011 14:34:37 +0300
Subject: Fwd: why ps/fname of a python interpreter changes across platforms?
In-Reply-To: <CAFEUn8YFyNiF+U2L7JMMkV1adnYBUgJJb5H-_g4ZVzaELB1XvQ@mail.gmail.com>
References: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>
	<4e732f68$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<CAFEUn8YFyNiF+U2L7JMMkV1adnYBUgJJb5H-_g4ZVzaELB1XvQ@mail.gmail.com>
Message-ID: <CAFEUn8a4_jan6v1OdLFHUqOgTs46wsdfF95Gvv8NgKiio+kRBw@mail.gmail.com>

---------- Y?nlendirilmi? ileti ----------
Kimden: Ya?ar Arabac? <yasar11732 at gmail.com>
Tarih: 16 Eyl?l 2011 14:33
Konu: Re: why ps/fname of a python interpreter changes across platforms?
Kime: Steven D'Aprano <steve+comp.lang.python at pearwood.info>


For example, in arch linux, I had 3 different interpreters named python,
python26 and python27 because some of the applications needed one, and some
needed others. That might be the reason.


2011/9/16 Steven D'Aprano <steve+comp.lang.python at pearwood.info>

> keobox wrote:
>
> > Hello,
> > I'm writing a little supervisor of some python scripts.
> > To check if the scrips are running I'm using the ps -o pid,fname
> > command on both RH Linux and solaris 10.
> > All the scripts are launched using "python script.py" command, they
> > are not launched with exec permissions.
> >
> > I don't know why the fname of the python interpreter changes across
> > platforms.
>
> Ask the person who built the system, or the people who made the
> distribution. They are free to name the Python executable anything they
> like.
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://yasar.serveblog.net/




-- 
http://yasar.serveblog.net/
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From oktaysafak at superonline.com  Fri Sep 16 08:12:50 2011
From: oktaysafak at superonline.com (Oktay Safak)
Date: Fri, 16 Sep 2011 15:12:50 +0300
Subject: Turkic I and re
In-Reply-To: <j4usl8$jel$1@r03.glglgl.eu>
References: <4E71F763.2010109@mrabarnett.plus.com><mailman.1163.1316092594.27778.python-list@python.org>
	<j4usl8$jel$1@r03.glglgl.eu>
Message-ID: <4E733D42.90400@superonline.com>

Well, I'm a self taught Turkish python coder. I was bitten by this first 
in Python 2.3 and asked the group about it then. You can find the 
correspondence by googling "unicode bug in turkish characters? 
<http://mail.python.org/pipermail/python-list/2003-April/809637.html>" 
There are a couple of posts with that topic line but they don't come out 
in one thread. So check them all.

Anyway, to summarize, Martin v.L?wis answered my question back then and 
suggested some locale settings but the problem seems to be with Windows 
actually. His method worked on Linux, but not on windows. He said that 
Python delegates uppercasing of strings to the operating system on 
Windows, and Windows is broken there. What he said was:

"Python delegates the toupper call to the operating system. It does not,
in itself, include a database of lower/upper case conversions for all 
locales.

So there is nothing we can do about that; ask Microsoft."

So I ended up not asking Microsoft of course, but using [i?] in re and writing a couple of utility functions upper_tr(), lower_tr() and title_tr() etc to use in my own projects. But of course when foreign language names etc. are mixed in a text it blows but I can't see a way to avoid it when that's the case.

I hope this helps,


Oktay Safak



Thomas Rachel wrote:
> Am 15.09.2011 15:16 schrieb Alan Plum:
>
>> The Turkish 'I' is a peculiarity that will probably haunt us programmers
>> until hell freezes over.
>
> That's why it would have been nice if the Unicode guys had defined 
> "both Turkish i-s" at separate codepoints.
>
> Then one could have the three pairs
> I, i ("normal")
> I (other one), ?
>
> and
>
> ?, i (the other one).
>
> But alas, they haven't.
>
>
> Thomas
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From miki.tebeka at gmail.com  Fri Sep 16 09:08:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 16 Sep 2011 06:08:54 -0700 (PDT)
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <mailman.1196.1316162247.27778.python-list@python.org>
References: <mailman.1196.1316162247.27778.python-list@python.org>
Message-ID: <da9bc4e6-bcea-4ce3-83be-0265eeb9f585@glegroupsg2000goo.googlegroups.com>

As a side note, it's way easier to get this data using YQL. See for example:

http://developer.yahoo.com/yql/console/?q=show%20tables&env=store://datatables.org/alltableswithkeys#h=SELECT%20*%20FROM%20yahoo.finance.options%20WHERE%20symbol%3D%27C%27%20AND%20expiration%3D%272011-09%27

Which gives you the data in JSON format.

(See link at bottom for API URL)


From miki.tebeka at gmail.com  Fri Sep 16 09:08:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 16 Sep 2011 06:08:54 -0700 (PDT)
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <mailman.1196.1316162247.27778.python-list@python.org>
References: <mailman.1196.1316162247.27778.python-list@python.org>
Message-ID: <da9bc4e6-bcea-4ce3-83be-0265eeb9f585@glegroupsg2000goo.googlegroups.com>

As a side note, it's way easier to get this data using YQL. See for example:

http://developer.yahoo.com/yql/console/?q=show%20tables&env=store://datatables.org/alltableswithkeys#h=SELECT%20*%20FROM%20yahoo.finance.options%20WHERE%20symbol%3D%27C%27%20AND%20expiration%3D%272011-09%27

Which gives you the data in JSON format.

(See link at bottom for API URL)


From JKPeck at gmail.com  Fri Sep 16 09:09:30 2011
From: JKPeck at gmail.com (JKPeck)
Date: Fri, 16 Sep 2011 06:09:30 -0700 (PDT)
Subject: Strange Python internal error
Message-ID: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>

We have a user on Windows with Python 2.6 who gets this error message when executing an import statement.
    from extension import Template, Syntax, processcmd 
SystemError: ..\Objects\listobject.c:169: bad argument to internal function

The module can be imported directly via
import extension
with no problem.  And large numbers of other users execute this same code with no problem.

Does anybody have a clue as to how this might arise?

TIA,
Jon Peck


From 1248283536 at qq.com  Fri Sep 16 09:26:28 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Fri, 16 Sep 2011 21:26:28 +0800
Subject: parse  html:what is the meaning of "//"?
Message-ID: <tencent_0711CEFE2EF94E273B454283@qq.com>

through  the  following code,i get the content of webpage,
     import lxml.html
     url = 'http://finance.yahoo.com/q/op?s=C+Options'
     root = lxml.html.parse(url).getroot() 

with your method ,how can i get the content of webpage  in my python program?

------------------ Original ------------------
From:  "Miki Tebeka"<miki.tebeka at gmail.com>;
Date:  Fri, Sep 16, 2011 09:08 PM
To:  "python-list"<python-list at python.org>; 
Cc:  "python-list"<python-list at python.org>; 
Subject:  Re: parse  html:what is the meaning of "//"?

 
As a side note, it's way easier to get this data using YQL. See for example:

http://developer.yahoo.com/yql/console/?q=show%20tables&env=store://datatables.org/alltableswithkeys#h=SELECT%20*%20FROM%20yahoo.finance.options%20WHERE%20symbol%3D%27C%27%20AND%20expiration%3D%272011-09%27

Which gives you the data in JSON format.

(See link at bottom for API URL)
-- 
http://mail.python.org/mailman/listinfo/python-list
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From vincent.vandevyvre at swing.be  Fri Sep 16 09:52:16 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Fri, 16 Sep 2011 15:52:16 +0200
Subject: Different class 'str' between v3.
In-Reply-To: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
Message-ID: <4E735490.4060509@swing.be>

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From nobody at nowhere.com  Fri Sep 16 09:57:06 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 16 Sep 2011 14:57:06 +0100
Subject: Cancel or timeout a long running regular expression
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<mailman.1182.1316112919.27778.python-list@python.org>
Message-ID: <pan.2011.09.16.13.57.05.761000@nowhere.com>

On Thu, 15 Sep 2011 14:54:57 -0400, Terry Reedy wrote:

>> I was thinking there might be a technique I could use to evaluate
>> regular expressions in a thread or another process launched via
>> multiprocessing module and then kill the thread/process after a
>> specified timeout period.
> 
> Only solution I remember ever seen posted. I wonder if there are any 
> heuristics for detecting exponential time re's.

Exponential growth results from non-determinism, i.e. if there are
multiple transitions for a given character from a given state.

Common patterns include:

	...(a...)?a...
	...(a...)*a...
	...(a...)+a...

with a choice between matching the "a" at the start of the bracketed
pattern or the "a" following it.

	(xxxa...|xxxb...|xxxc...)

with a choice between branches which cannot be resolved until more data
has been read.

For re.search (as opposed to re.match):

	axxxa...

When axxx has been read, a following "a" gives a choice between
continuing the existing match with the second "a", or aborting and
matching against the first "a". For patterns which contain many copies of
the initial character, each copy creates another branch.

Also, using back-references in a regexp [sic] can be a significant
performance killer, as it rules out the use of a DFA (which, IIRC, Python
doesn't do anyhow) and can require brute-forcing many combinations. A
particularly bad case is:

	(a*)\1

matching against "aaaaaaaa...".

If the performance issue is with re.match/re.search rather than with
re.compile, one option is to use ctypes to access libc's regexp functions.
Those are likely to provide better searching throughput at the expense of
potentially increased compilation time.



From andrea.crotti.0 at gmail.com  Fri Sep 16 10:00:10 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 16 Sep 2011 15:00:10 +0100
Subject: create a directory structure
In-Reply-To: <4E732F4B.3090409@gmail.com>
References: <4E732F4B.3090409@gmail.com>
Message-ID: <4E73566A.1010808@gmail.com>

After some research, I think that paste-script is the best choice in 
this case.

I can define templates and I'll get my directory structure nicely 
populated for me.


From duncan.booth at invalid.invalid  Fri Sep 16 10:44:12 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 16 Sep 2011 14:44:12 GMT
Subject: why ps/fname of a python interpreter changes across platforms?
References: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>
Message-ID: <Xns9F629F22BAF67duncanbooth@127.0.0.1>

keobox <keobox at gmail.com> wrote:

> I don't know why the fname of the python interpreter changes across
> platforms.
> 
> I saw a "isapytho" in some solaris 10 platforms.
> I saw "python2." in some Linux platforms.
> On most platforms the value is "python".
> Why?
> 
It shows you part of the name of the program that is running.

On a typical Linux system you could run python using the default 
interpreter 'python', or you could be explicit about the version you want 
to run and use 'python2.4', 'python2.5', 'python2.6', 'python2.7', 
'python3.2' (all of these are available on the system in from of me). Of 
course 4 of those will be truncated to 'python2.' if you only look at the 
first 8 characters (which is what your command does) but you also get 
'python' and 'python3.'

That's why there's a lot of variation. I have no idea why it has a strange 
name on Solaris, maybe someone compiled their own private version.

-- 
Duncan Booth http://kupuguy.blogspot.com


From aspineux at gmail.com  Fri Sep 16 11:42:25 2011
From: aspineux at gmail.com (aspineux)
Date: Fri, 16 Sep 2011 08:42:25 -0700 (PDT)
Subject: pyzmail-0.9.9 mail library to read, compose and send emails easily,
	support for py3k
Message-ID: <c1be2c43-8892-4e05-8ccc-e7064737ebf5@t29g2000vby.googlegroups.com>

Now pyzmail include support for python 3.2 and above

pyzmail is a high level mail library for Python. It provides functions
and classes that help to read, compose and send emails. pyzmail exists
because their is no reasons that handling mails with Python would be
more difficult than with popular mail clients like Outlook or
Thunderbird. pyzmail hide the difficulties of the MIME structure and
MIME encoding/decoding. It also hide the problem of the
internationalized header encoding/decoding.

The library contains lot of sample and is very well documented.

http://www.magiksys.net/pyzmail/

Alain Spineux


From miki.tebeka at gmail.com  Fri Sep 16 12:13:14 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 16 Sep 2011 09:13:14 -0700 (PDT)
Subject: Strange Python internal error
In-Reply-To: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
Message-ID: <1e1f841b-dc17-42d3-bf88-86a27a92752e@glegroupsg2000goo.googlegroups.com>

Try to narrow it down:
from extension import Template
from extension import Syntax
from extension import processcmd 

Which one fails? What is this "extension" package?


From martin.schoon at gmail.com  Fri Sep 16 13:29:53 2011
From: martin.schoon at gmail.com (Martin =?UTF-8?Q?Sch=C3=B6=C3=B6n?=)
Date: 16 Sep 2011 17:29:53 GMT
Subject: Accessing matplotlib-users discussion group?
References: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>
	<d20cc76c-5ba6-4311-8459-0327134c8c49@u10g2000yqk.googlegroups.com>
Message-ID: <9dhfchFvt2U1@mid.individual.net>

On 2011-09-15, John Ladasky <ladasky at my-deja.com> wrote:
> Hate to bump this, but... I found Sourceforge's IRC, and tried to ask
> for help there, and it doesn't look like I can get any help until
> business hours tomorrow.  Anyone?

No help really but I 'joined' Sourceforge about a year ago and
had no problems whatsoever.

Could it be some anti-robot filter that's gotten overly picky?

/Martin


From ramit.prasad at jpmorgan.com  Fri Sep 16 13:52:33 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 13:52:33 -0400
Subject: ImportError: cannot import name dns
In-Reply-To: <CAAuurf+z7VWz=a99fhyMxHPWTO+ZWdNHLCR5MBFeYGQq0P86kQ@mail.gmail.com>
References: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>
	<CAAuurf+z7VWz=a99fhyMxHPWTO+ZWdNHLCR5MBFeYGQq0P86kQ@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB5052@EMARC112VS01.exchad.jpmchase.net>

NOTE: This is all speculation on my part. I am hoping someone on the list will give us more concrete details.

1. check for "dns" in sys.modules (initially not found)
2. create new empty module, add it to sys.modules as "dns"
3. execute dns.py in new module namespace (executes "from foo import udp") 
It has not yet added anything defined in dns because it is still on import statement

4. check for "udp" in sys.modules (not found)
5. create new empty module, add it to sys.modules as "udp"
6. execute udp.py in new module namespace (executes "from foo import dns") 
Cannot do this because dns is still not defined even though it the name is in sys.modules and since we are still in the middle of the first statement defining dns, it raises an error.


7. check for "dns" in sys.modules (found!)
8. done executing udp.py
9. done executing dns.py

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



-----Original Message-----
From: Jack Bates [mailto:jack.bates at gmail.com] 
Sent: Wednesday, September 14, 2011 11:22 AM
To: Prasad, Ramit
Cc: python-list at python.org
Subject: Re: ImportError: cannot import name dns

> It is a circular dependency. Dns will try to import udp which will in turn import dns (again) in an endless cycle; instead an ImportError is raised.
>
> Circular dependency is a Bad Thing.

According to this documentation:

http://docs.python.org/reference/simple_stmts.html#grammar-token-import_stmt

http://effbot.org/zone/import-confusion.htm

 - I thought Python would do something like:

So I'd expect attempting to access symbols from "dns" while executing
udp.py to fail, because dns.py isn't done executing at this point.
However I don't attempt to access any symbols from "dns" - so I don't
expect this ImportError

What is my mistake?
This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From brandonfigura at gmail.com  Fri Sep 16 14:12:21 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 11:12:21 -0700 (PDT)
Subject: strange results
Message-ID: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>

I am having a problem with a graphics program that I created.
Actually, I don't know if it is the program or a bug in Python. The
code for the program is as follows;

from gasp import *

begin_graphics(width=640, height=480, title='Houses at Night',
background=color.BLACK)

def draw_house(x, y):
    a = (x, y  + 100)
    b = (x +50, y +140)
    c = (x +100, y + 100)
    Box((x, y), 100, 100, filled=True, color=color.BLUE)        # the
house
    Box((x + 35, y), 30, 50, filled=True, color=color.GREEN)        #
the door
    Circle((x + 62, y + 16), 1, filled=True, color=color.GOLD)
# the door knob
    Box((x + 20, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the left window
    Line((x + 20, y + 71), (x + 40, y + 71),
color=color.ORANGE)        # horizontal line (left window)
    Line((x + 29, y + 60), (x + 29, y + 80),
color=color.ORANGE)        # vertical line (left window)
    Box((x + 60, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the right window
    Line((x + 60, y + 71), (x + 80, y + 71),
color=color.ORANGE)        # horizontal line (right window)
    Line((x + 69, y + 60), (x + 69, y + 80),
color=color.ORANGE)        # vertical line (right window)
    Polygon([a, b, c], filled=True, color=color.RED)        # the roof

draw_house(20, 20)
draw_house(270, 20)
draw_house(520, 20)
draw_house(145, 180)
draw_house(395, 180)
draw_house(270, 340)

update_when('key_pressed')
end_graphics()
ends here, but it


When I run the program, I do not get any error messages but there are
parts of the 'draw_house' function missing on the canvas. Each call to
'draw_house has different things missing, they are not all the exact
same. There are some parts that show in one call to 'draw_house' that
do not show in others and visa versa. Does anyone have any idea what
may be going on?


From brandonfigura at gmail.com  Fri Sep 16 14:35:12 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 11:35:12 -0700 (PDT)
Subject: unexpected results
Message-ID: <13f31aba-e7e3-4697-96fa-74ab26bfc18a@s20g2000yql.googlegroups.com>

I am having a problem when I run a graphics program that I created. I
do not get an error when I run the program, there are just some weird
things going on. I do not know if it is the program causing the
problem or a bug in Python. Here is the code for the program:


from gasp import *

begin_graphics(width=640, height=480, title='Houses at Night',
background=color.BLACK)

def draw_house(x, y):        # function for drawing a house
    a = (x, y  + 100)        # 'a' coordinate for Polygon
    b = (x +50, y +140)        # 'b' coordinate for Polygon
    c = (x +100, y + 100)        # 'c' coordinate for Polygon
    Box((x, y), 100, 100, filled=True, color=color.BLUE)        # the
house
    Box((x + 35, y), 30, 50, filled=True, color=color.GREEN)        #
the door
    Circle((x + 62, y + 16), 1, filled=True, color=color.GOLD)
# the door knob
    Box((x + 20, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the left window
    Line((x + 20, y + 71), (x + 40, y + 71),
color=color.ORANGE)        # horizontal line (left window)
    Line((x + 29, y + 60), (x + 29, y + 80),
color=color.ORANGE)        # vertical line (left window)
    Box((x + 60, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the right window
    Line((x + 60, y + 71), (x + 80, y + 71),
color=color.ORANGE)        # horizontal line (right window)
    Line((x + 69, y + 60), (x + 69, y + 80),
color=color.ORANGE)        # vertical line (right window)
    Polygon([a, b, c], filled=True, color=color.RED)        # the roof

draw_house(20, 20)
draw_house(270, 20)
draw_house(520, 20)
draw_house(145, 180)
draw_house(395, 180)
draw_house(270, 340)

update_when('key_pressed')
end_graphics()



The program launches just fine, bringing up the gasp window like it
should. The problem is that almost all of the calls to 'draw_house'
are different. Some features will show up in one house but not in
another and visa versa. Does anyone have any idea what the problem may
be?


From brandonfigura at gmail.com  Fri Sep 16 14:39:54 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 11:39:54 -0700 (PDT)
Subject: unexpected results
References: <13f31aba-e7e3-4697-96fa-74ab26bfc18a@s20g2000yql.googlegroups.com>
Message-ID: <e7934b35-ad39-491b-981e-c59d0b7a853f@gz5g2000vbb.googlegroups.com>

Sorry, Everyone. I got an error when posting the first post and did'nt
come in to see if it had actually posted before I tried another post.




From ben.r.shepherd at gmail.com  Fri Sep 16 14:47:43 2011
From: ben.r.shepherd at gmail.com (Benshep)
Date: Fri, 16 Sep 2011 11:47:43 -0700 (PDT)
Subject: Using tuples to eliminate multiple dict values
Message-ID: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>

I need a dictionary that returns the same value for multiple keys.

i.e.

(1)   >>> dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
(2)   >>>dict[1]
(3)   'text'

I cant figure out what i need on line 2 to make this scenario work. Is
there a simple way to check if the a number is present in the key and
then return the value?

Thanks


From thatiparthysreenivas at gmail.com  Fri Sep 16 15:21:06 2011
From: thatiparthysreenivas at gmail.com (zombie)
Date: Fri, 16 Sep 2011 12:21:06 -0700 (PDT)
Subject: way to calculate 2**1000 without expanding it?
Message-ID: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>

Hi guys,
         i am writing a program to sum up the digits of a number 2**1000?
Is there a way/formula to do it without expanding it?



From ramit.prasad at jpmorgan.com  Fri Sep 16 15:28:07 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 15:28:07 -0400
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB52AB@EMARC112VS01.exchad.jpmchase.net>

-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Benshep
Sent: Friday, September 16, 2011 1:48 PM
To: python-list at python.org
Subject: Using tuples to eliminate multiple dict values

I need a dictionary that returns the same value for multiple keys.

i.e.

(1)   >>> dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
(2)   >>>dict[1]
(3)   'text'

I cant figure out what i need on line 2 to make this scenario work. Is
there a simple way to check if the a number is present in the key and
then return the value?

Thanks
----------------------------------------------------------------

I think I must be missing something. Can you not do the following?

>>> d = { 1:'text', 2:'text', 3:'text', 5:'other text', 6:'other text', 7:'other text' }
>>> d[1]
'text'



If you are they need to share the same value you can also do something like this.

>>> t1 = [ 'text' ]
>>> t2 = [ 'other text' ]
>>> d = { 1:t1, 2:t1, 3:t1, 5:t2, 6:t2, 7:t2 }
>>> d[1]
['text']
>>> d[1][0]='new text'
>>> d[2][0]
'new text'
>>> d
{1: ['new text'], 2: ['new text'], 3: ['new text'], 5: ['other text'], 6: ['other text'], 7: ['other text']}


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From python at mrabarnett.plus.com  Fri Sep 16 15:29:41 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 16 Sep 2011 20:29:41 +0100
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <4E73A3A5.3090209@mrabarnett.plus.com>

On 16/09/2011 19:47, Benshep wrote:
> I need a dictionary that returns the same value for multiple keys.
>
> i.e.
>
> (1)>>>  dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }

That will create a dict with 2 keys, both of which are tuples.

> (2)>>>dict[1]
> (3)   'text'
>
> I cant figure out what i need on line 2 to make this scenario work. Is
> there a simple way to check if the a number is present in the key and
> then return the value?
>
If you want multiple keys, then you must provide them separately:

my_dict = {1: 'text', 2: 'text', 3: 'text', 5: 'other text', 6 : 'other 
text', 7: 'other text'}

or use 'for' to iterate through the keys for each value:

my_dict = dict([(k, 'text') for k in (1, 2, 3)] + [(k, 'other text') for 
k in (5, 6, 7)])

or something similar.


From ben.r.shepherd at gmail.com  Fri Sep 16 15:47:14 2011
From: ben.r.shepherd at gmail.com (Benshep)
Date: Fri, 16 Sep 2011 12:47:14 -0700 (PDT)
Subject: Using tuples to eliminate multiple dict values
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
	<mailman.1209.1316201385.27778.python-list@python.org>
Message-ID: <3827f27a-8a37-4609-a9b1-62f06635c76d@hg2g2000vbb.googlegroups.com>

thanks,

I had a feeling that may be the way to go and my data just changed so
it will work better that way.

Thanks for the quick reply


From arnodel at gmail.com  Fri Sep 16 16:00:24 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 16 Sep 2011 21:00:24 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
Message-ID: <CAJ6cK1bqOP60hnR8D_XKaVjzkuR-MTK=Kx9ETwi_QgqOo7_prQ@mail.gmail.com>

On 16 September 2011 20:21, zombie <thatiparthysreenivas at gmail.com> wrote:
> Hi guys,
> ? ? ? ? i am writing a program to sum up the digits of a number 2**1000?
> Is there a way/formula to do it without expanding it?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

In base 2, the answer is 1 :)

Hopefully-helpfully-but-not-so-sure'ly yours,

--
Arnaud


From ian.g.kelly at gmail.com  Fri Sep 16 16:06:34 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 14:06:34 -0600
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
Message-ID: <CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>

On Fri, Sep 16, 2011 at 1:21 PM, zombie <thatiparthysreenivas at gmail.com> wrote:
> Hi guys,
> ? ? ? ? i am writing a program to sum up the digits of a number 2**1000?
> Is there a way/formula to do it without expanding it?

Possibly, but why worry about it?  It's only around 300 digits.

Since this sounds like homework, I won't post the one-liner I used to
do it the brute-force way, but I will note that it takes about 200
microseconds to run on my laptop.

Cheers,
Ian


From ramit.prasad at jpmorgan.com  Fri Sep 16 16:16:03 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 16:16:03 -0400
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB53D3@EMARC112VS01.exchad.jpmchase.net>

>> Hi guys,
>>         i am writing a program to sum up the digits of a number 2**1000?
>> Is there a way/formula to do it without expanding it?

>Since this sounds like homework, I won't post the one-liner I used to
>do it the brute-force way, but I will note that it takes about 200
>microseconds to run on my laptop.

If you happen to be new to Python, I will say I used these functions to create a one liner (in alphabetical order).

Int
Lambda
Map
Reduce
Str


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From arnodel at gmail.com  Fri Sep 16 16:17:45 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 16 Sep 2011 21:17:45 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
Message-ID: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>

On 16 September 2011 21:06, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 1:21 PM, zombie <thatiparthysreenivas at gmail.com> wrote:
>> Hi guys,
>> ? ? ? ? i am writing a program to sum up the digits of a number 2**1000?
>> Is there a way/formula to do it without expanding it?
>
> Possibly, but why worry about it? ?It's only around 300 digits.
>
> Since this sounds like homework, I won't post the one-liner I used to
> do it the brute-force way, but I will note that it takes about 200
> microseconds to run on my laptop.

Ah go on, let's make a codegolf contest out of it.
My entry:

>>> sum(map(int,str(2**1000)))
1366

-- 
Arnaud


From ian.g.kelly at gmail.com  Fri Sep 16 16:20:46 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 14:20:46 -0600
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
Message-ID: <CALwzidkhGCx05gART7sa1p7DKDvLA4zXpFvnX9CJQY45zuSdKg@mail.gmail.com>

On Fri, Sep 16, 2011 at 2:17 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> Ah go on, let's make a codegolf contest out of it.
> My entry:
>
>>>> sum(map(int,str(2**1000)))
> 1366

That is exactly what mine was.


From nagle at animats.com  Fri Sep 16 16:50:45 2011
From: nagle at animats.com (John Nagle)
Date: Fri, 16 Sep 2011 13:50:45 -0700
Subject: Why do closures do this?
In-Reply-To: <mailman.501.1314505201.27778.python-list@python.org>
References: <20110828134505.795cd32b8fc5ccc472f85ae3@johnohagan.com>
	<mailman.501.1314505201.27778.python-list@python.org>
Message-ID: <4e73b6a7$0$1667$742ec2ed@news.sonic.net>

On 8/27/2011 9:19 PM, Terry Reedy wrote:
> On 8/27/2011 11:45 PM, John O'Hagan wrote:
>> Somewhat apropos of the recent "function principle" thread, I was
>> recently surprised by this:
>>
>> funcs=[]
>> for n in range(3):
>> def f():
>> return n
>> funcs.append(f)
>>
>>
>>
>> The last expression, IMO surprisingly, is [2,2,2], not [0,1,2].

    That's correct behavior, because a closure captures the binding of
a nonlocal variable, not its value.  There is only one "n" for all
iterations.

    If you create a local variable within the closed function:

        def f()
            localn = n
            return(localn)

there's a copy of "localn" for each iteration, and you're returning
it.

Try this in PyPy, which tries not to box numbers, and see what happens
there.  This is one of those Python features which complicates
optimization.  For performance, an implementation should handle numbers
as machine numbers, not objects.  (Creating an object to hold a
machine primitive like an int, float, or bool is called "boxing' the
number.)  CPython always carries around a full
CObject for ordinary numbers, which is why CPython numeric performance
is so bad.  PyPy tries not to do that, although there are rare
cases when it has to, like this one.

					John Nagle


From gherron at digipen.edu  Fri Sep 16 16:53:10 2011
From: gherron at digipen.edu (Gary Herron)
Date: Fri, 16 Sep 2011 13:53:10 -0700
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
Message-ID: <4E73B736.7060401@digipen.edu>

On 09/16/2011 01:17 PM, Arnaud Delobelle wrote:
> On 16 September 2011 21:06, Ian Kelly<ian.g.kelly at gmail.com>  wrote:
>> On Fri, Sep 16, 2011 at 1:21 PM, zombie<thatiparthysreenivas at gmail.com>  wrote:
>>> Hi guys,
>>>          i am writing a program to sum up the digits of a number 2**1000?
>>> Is there a way/formula to do it without expanding it?
>> Possibly, but why worry about it?  It's only around 300 digits.
>>
>> Since this sounds like homework, I won't post the one-liner I used to
>> do it the brute-force way, but I will note that it takes about 200
>> microseconds to run on my laptop.
> Ah go on, let's make a codegolf contest out of it.
> My entry:
>
>>>> sum(map(int,str(2**1000)))
> 1366
>

Here's another one-liner using a generator instead of map:

     sum(int(c) for c in str(2**1000))

Gary Herron



-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From arnodel at gmail.com  Fri Sep 16 16:57:12 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 16 Sep 2011 21:57:12 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CALwzidkhGCx05gART7sa1p7DKDvLA4zXpFvnX9CJQY45zuSdKg@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<CALwzidkhGCx05gART7sa1p7DKDvLA4zXpFvnX9CJQY45zuSdKg@mail.gmail.com>
Message-ID: <CAJ6cK1bZXnf2ujif2qX2ctEfDwR1Vfr3E49vw57HoRyNaywa-Q@mail.gmail.com>

On 16 September 2011 21:20, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 2:17 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
>> Ah go on, let's make a codegolf contest out of it.
>> My entry:
>>
>>>>> sum(map(int,str(2**1000)))
>> 1366
>
> That is exactly what mine was.
>

Slightly longer:

>>> eval("+".join(str(2**1000)))
1366

This looks like a winner but I cheated (the result depends on the
state of the interpreter):

>>> eval("+".join(`2**1000`))
1366

-- 
Arnaud


From stefan-usenet at bytereef.org  Fri Sep 16 17:07:31 2011
From: stefan-usenet at bytereef.org (Stefan Krah)
Date: Fri, 16 Sep 2011 23:07:31 +0200
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <4E73B736.7060401@digipen.edu>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<4E73B736.7060401@digipen.edu>
Message-ID: <20110916210731.GA20553@sleipnir.bytereef.org>

Gary Herron <gherron at digipen.edu> wrote:
>>>> i am writing a program to sum up the digits of a number 2**1000?
>>>> Is there a way/formula to do it without expanding it?
>
> Here's another one-liner using a generator instead of map:
>
>     sum(int(c) for c in str(2**1000))

The OP did not specify the base:

>>> bin(2**1000).count('1')
1


Or just:

>>> print(1)
1


Stefan Krah




From ramit.prasad at jpmorgan.com  Fri Sep 16 17:13:38 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 17:13:38 -0400
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB54F7@EMARC112VS01.exchad.jpmchase.net>

>>> sum(map(int,str(2**1000)))
*smacks face* Gah, forgot about sum.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From tjreedy at udel.edu  Fri Sep 16 18:01:27 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 16 Sep 2011 18:01:27 -0400
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <pan.2011.09.16.13.57.05.761000@nowhere.com>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<mailman.1182.1316112919.27778.python-list@python.org>
	<pan.2011.09.16.13.57.05.761000@nowhere.com>
Message-ID: <j50gvt$bs0$1@dough.gmane.org>

On 9/16/2011 9:57 AM, Nobody wrote:
>>I wonder if there are any
>> heuristics for detecting exponential time re's.
>
> Exponential growth results from non-determinism, i.e. if there are
> multiple transitions for a given character from a given state.
>
> Common patterns include:
>
> 	...(a...)?a...
> 	...(a...)*a...
> 	...(a...)+a...
>
> with a choice between matching the "a" at the start of the bracketed
> pattern or the "a" following it.
>
> 	(xxxa...|xxxb...|xxxc...)
>
> with a choice between branches which cannot be resolved until more data
> has been read.
>
> For re.search (as opposed to re.match):
>
> 	axxxa...
>
> When axxx has been read, a following "a" gives a choice between
> continuing the existing match with the second "a", or aborting and
> matching against the first "a". For patterns which contain many copies of
> the initial character, each copy creates another branch.
>
> Also, using back-references in a regexp [sic] can be a significant
> performance killer, as it rules out the use of a DFA (which, IIRC, Python
> doesn't do anyhow) and can require brute-forcing many combinations. A
> particularly bad case is:
>
> 	(a*)\1
>
> matching against "aaaaaaaa...".
>
> If the performance issue is with re.match/re.search rather than with
> re.compile, one option is to use ctypes to access libc's regexp functions.
> Those are likely to provide better searching throughput at the expense of
> potentially increased compilation time.

Now, can you write that as a heuristic *algorithm* def 
dangerous_re(some_re):?

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Fri Sep 16 18:16:43 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 16 Sep 2011 18:16:43 -0400
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <j4vabe$njo$1@dough.gmane.org>
References: <tencent_72532068286D43F3549C09BB@qq.com>
	<j4vabe$njo$1@dough.gmane.org>
Message-ID: <j50hsi$heo$1@dough.gmane.org>

On 9/16/2011 7:02 AM, Stefan Behnel wrote:

>> 0.00
>> N/A
>> N/A
>> 115
>> 2,411
>>
>>
>> Highlighted options are in-the-money.
>
> I don't see any highlighting in your text above,

Gone with the ascii conversion.

> and I don't know what you mean by "in-the-money".

If a stock sells now for $20, an option to buy it for $19 is 
in-the-money and has definite value while an option to buy it for $21 is 
not, but is out-of-the-money and only has value according to one's 
subjective estimate of the likelihood of a rise above $21 before the 
option expires.

-- 
Terry Jan Reedy



From emekamicro at gmail.com  Fri Sep 16 18:19:05 2011
From: emekamicro at gmail.com (Emeka)
Date: Sat, 17 Sep 2011 00:19:05 +0200
Subject: Code Review
Message-ID: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>

Hello All,

While learning Python I put together another Text Twist. I would want
somebody to go through it and comment.
https://github.com/janus/Text-Twist

-- 

Regards,
Emeka
*


*
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From tjreedy at udel.edu  Fri Sep 16 18:30:03 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 16 Sep 2011 18:30:03 -0400
Subject: Different class 'str' between v3.
In-Reply-To: <4E735490.4060509@swing.be>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
	<4E735490.4060509@swing.be>
Message-ID: <j50ilh$llp$1@dough.gmane.org>

On 9/16/2011 9:52 AM, Vincent Vande Vyvre wrote:
> Testing the following code, I've differend return with python 3.1.2 and
> 3.2.2

running on two different machines with two different versions of Linux.

I get

> # -*- coding: utf-8 -*-
>
> import os
> import sys
> import platform
>
> print('\nPython version: ', sys.version.split()[0])
> print(platform.platform())
>
> paths = ['/home/vincent/image.jpg', '/home/vincent/?????.jpg']
>
> for path in paths:
> print('\nPath: {0}, Type: {1}'.format(path, type(path)))
> if not os.path.exists(path) or not os.path.isfile(path):
> print('File not found: {0}'.format(path))
> else:
> print('File exists')

I get

Python version:  3.2.2rc1
Windows-7-6.1.7601-SP1

Path: /home/vincent/image.jpg, Type: <class 'str'>
File not found: /home/vincent/image.jpg

Path: /home/vincent/?????.jpg, Type: <class 'str'>
File not found: /home/vincent/?????.jpg

so

> [vincent at myhost ~]$ python string_2.py
>
> Python version: 3.2.2
> Linux-3.0-ARCH-x86_64-Pentium-R-_Dual-Core_CPU_T4500_ at _2.30GHz-with-glibc2.2.5
>
> Path: /home/vincent/image.jpg, Type: <class 'str'>
> File exists
> Traceback (most recent call last):
> File "string_2.py", line 13, in <module>
> print('\nPath: {0}, Type: {1}'.format(path, type(path)))
> UnicodeEncodeError: 'ascii' codec can't encode characters in position
> 21-25: ordinal not in range(128)

is not specific to 3.2.2 in general. Try the two Python versions on the 
same machine. Or try the test suite on each. See the test module doc for 
how.

-- 
Terry Jan Reedy




From brandonfigura at gmail.com  Fri Sep 16 19:09:33 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 16:09:33 -0700 (PDT)
Subject: strange results
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
Message-ID: <c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>

I took out all of the color commands that were in the shape functions
and all of the features to the 'draw_house' function showed showed up.
I started putting the color commands back into the shape functions and
have no problems with some of them but when I put the color command
back into others, some of the features start to disappear. As far as I
can see, all of the code is right but I'm just a beginner so I am not
for sure. Can anyone tell me why this is doing what it is.



From rosuav at gmail.com  Fri Sep 16 19:19:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 17 Sep 2011 09:19:53 +1000
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <CAPTjJmqMhHRv=Uy45fh1rDuXxPOrghXiYSCpE-8WigB20=o7Zw@mail.gmail.com>

On Sat, Sep 17, 2011 at 4:47 AM, Benshep <ben.r.shepherd at gmail.com> wrote:
> (1) ? >>> dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
>

As I understand it, you're looking for a simple syntax for what MRAB posted:
> my_dict = {1: 'text', 2: 'text', 3: 'text', 5: 'other text', 6 : 'other text', 7: 'other text'}

Since your first line of code is syntactically legal, you could do a
simple check afterwards to translate it:

my_dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
for k in list(my_dict.keys()):
    if isinstance(k,tuple):
        val=my_dict.pop(k)
        for i in k: my_dict[i]=val

Tested in Python 3.2; in Python 2, the list() call is superfluous,
everything else should work fine.

Chris Angelico


From ian.g.kelly at gmail.com  Fri Sep 16 19:28:39 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 17:28:39 -0600
Subject: Different class 'str' between v3.
In-Reply-To: <4E735490.4060509@swing.be>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
	<4E735490.4060509@swing.be>
Message-ID: <CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>

On Fri, Sep 16, 2011 at 7:52 AM, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
> [vincent at myhost ~]$ python string_2.py
>
> Python version:? 3.2.2
> Linux-3.0-ARCH-x86_64-Pentium-R-_Dual-Core_CPU_T4500_ at _2.30GHz-with-glibc2.2.5
>
> Path: /home/vincent/image.jpg, Type: <class 'str'>
> File exists
> Traceback (most recent call last):
> ? File "string_2.py", line 13, in <module>
> ??? print('\nPath: {0}, Type: {1}'.format(path, type(path)))
> UnicodeEncodeError: 'ascii' codec can't encode characters in position 21-25:
> ordinal not in range(128)

This looks like a terminal encoding issue on the second PC.  Your
terminal is probably not using a unicode encoding, and so it is unable
to print a unicode string.

Cheers,
Ian


From ppaterson at gmail.com  Fri Sep 16 19:48:08 2011
From: ppaterson at gmail.com (Paul Paterson)
Date: Fri, 16 Sep 2011 16:48:08 -0700 (PDT)
Subject: setuptools: getting data files to be installed
Message-ID: <9476205.3046.1316216888277.JavaMail.geo-discussion-forums@prdy8>

I'm having a problem using setuptools to create a distribution for a project that includes data files. I can get the data files to be included in the zipped package file (*.tar.gz) but when I easy_install the package the data files are not installed. (Ubuntu 11.04, Python2.7).

I'm trying to use easy_install because the project is a game with dependencies and so it would be nice for easy_install to handle all that for people.


My setup.py file is below at the end of the post. 

I create the zip with,

> python setup.py egg_info
...
> python setup.py sdist

Then the dist/tacman-0.1.tar.gz includes my data files as identified in the MANIFEST.in file.

But when I do,

> sudo easy_install dist/tacman-0.1.tar.gz

... the python modules appear in /usr/local/lib/python27/dist-packages/tacman-0.1-py2.7.egg but the data files are nowhere to be seen. I tried locating them using pkg_resources but that didn't help. Some Googling suggested /usr/share as a location but they weren't there either.

Am I looking in the right place or did they just not get installed?

The whole distribution file is at http://perpetualpyramid.com/tacman-0.1.tar.gz in case that helps. The file is bit large because it is a game and the zip includes the music and graphics.

Thanks for any help and pointers.

Paul

--- setup.py ---

from setuptools import setup, find_packages

import game.common

setup(name='tacman',
      version=game.common.version,
      scripts=['tacman.py'], 
      entry_points = {
        'console_scripts' : [
            'tacman = tacman.tacman',
        ]
      },
      description='A tactical, turn-based clone on PACMAN',
      author='Paul Paterson',
      author_email='ppaterson at gmail.com',
      url='http://www.perpetualpyramid/tacman.html',
      download_url=('http://perpetualpyramid.com/tacman-%s.tar.gz' % game.common.version),

      include_package_data=True,
      zip_safe=False,
      
      packages=[
        'serge', 'serge.blocks', 'serge.tools', 'serge.tools.template', 'game',
      ],
      package_dir={'':'.'},

      classifiers = [
        "Programming Language :: Python",
        "Programming Language :: Python :: 2",
        "Development Status :: 4 - Beta",
        "Environment :: Other Environment",
        "Intended Audience :: End Users/Desktop",
        "License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)",
        "Operating System :: OS Independent",
        "Topic :: Games/Entertainment",
        "Topic :: Games/Entertainment :: Puzzle Games",
        ],
       install_requires=[
         'pygame', 'networkx',
       ],
       long_description='''\
TACMAN
------

A turn-based, tactical version of PACMAN.

Play a PACMAN clone where the action is turn based. You move and then the 
ghosts move. The turn-based action adds additional tactical elements to the
game and allows you to plan ahead and outwit the ghosts!

Requires: Python 2.6+, pygame 1.9+, networkx

''',
         )


From python.list at tim.thechases.com  Fri Sep 16 19:48:40 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 16 Sep 2011 18:48:40 -0500
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <4E73E058.6010303@tim.thechases.com>

On 09/16/11 13:47, Benshep wrote:
> I need a dictionary that returns the same value for multiple keys.
>
> i.e.
>
> (1)>>>  dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
> (2)>>>dict[1]
> (3)   'text'
>
> I cant figure out what i need on line 2 to make this scenario work. Is
> there a simple way to check if the a number is present in the key and
> then return the value?

You could use something like

  d = dict(
    (k,v)
    for keys in (
      ((1,2,3), 'text'),
      ((5,6,7), 'other text'),
      )
    for k in keys
    )

which seems to do what you want with minimal redundancy of 
declarations.

-


From steve+comp.lang.python at pearwood.info  Fri Sep 16 22:17:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 17 Sep 2011 12:17:05 +1000
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<mailman.1213.1316204268.27778.python-list@python.org>
Message-ID: <4e740322$0$29983$c3e8da3$5496439d@news.astraweb.com>

Arnaud Delobelle wrote:

> Ah go on, let's make a codegolf contest out of it.
> My entry:
> 
>>>> sum(map(int,str(2**1000)))
> 1366


Time for some obfuscated Python!

b = (16,13624)
for i in range(23, 42, 3):
    b = (b[0]*b[0], b[1]+1024)

for j in range(12345, 8929, -7):
    b = (b[0]+b[0], b[1]-3)

while b > (0,9876):
    b = tuple((lambda a,b: map(lambda a,b:a+b, a,b))
        ((lambda a,b: map(lambda a,b:a*b, a,b))
        (b,(0,1)), (lambda a,b: map(lambda a,b:a-b, a,b))
        (divmod(b[0],10),(0,64))))

print b[1]



-- 
Steven



From invalid at invalid.invalid  Fri Sep 16 22:19:12 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 17 Sep 2011 02:19:12 +0000 (UTC)
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<mailman.1215.1316206402.27778.python-list@python.org>
Message-ID: <j51030$gie$1@reader1.panix.com>

On 2011-09-16, Gary Herron <gherron at digipen.edu> wrote:
> On 09/16/2011 01:17 PM, Arnaud Delobelle wrote:
>> On 16 September 2011 21:06, Ian Kelly<ian.g.kelly at gmail.com>  wrote:
>>> On Fri, Sep 16, 2011 at 1:21 PM, zombie<thatiparthysreenivas at gmail.com>  wrote:
>>>> Hi guys,
>>>>          i am writing a program to sum up the digits of a number 2**1000?
>>>> Is there a way/formula to do it without expanding it?
>>> Possibly, but why worry about it?  It's only around 300 digits.
>>>
>>> Since this sounds like homework, I won't post the one-liner I used to
>>> do it the brute-force way, but I will note that it takes about 200
>>> microseconds to run on my laptop.
>> Ah go on, let's make a codegolf contest out of it.
>> My entry:
>>
>>>>> sum(map(int,str(2**1000)))
>> 1366
>>
>
> Here's another one-liner using a generator instead of map:
>
>      sum(int(c) for c in str(2**1000))

Just in case you can't spare the 3KB required for the list of integers
that map creates. :)

In this case it doesn't matter, but it's not hard to find problems
where the difference between the memory requirements for a generator
and a map/list-comprehension are significant enough to worry about.

-- 
Grant



From chunuan723 at gmail.com  Fri Sep 16 22:56:41 2011
From: chunuan723 at gmail.com (he sharon)
Date: Fri, 16 Sep 2011 19:56:41 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <18e9f5c3-055e-4515-a7dc-517f46e90ec5@s2g2000vby.googlegroups.com>

our products:

red bull hats:  http://www.popbaseballhats.com/wholesale-113-b0-Red-Bull-Hats.html

red bull beanies: http://www.popbaseballhats.com/wholesale-112-b0-Red-Bull-Beanies.html

red bull t shirts: http://www.popbaseballhats.com/wholesale-114-b0-Red-Bull-T-Shirts.html

monster energy hats:
http://www.popbaseballhats.com/wholesale-100-b0-Monster-Energy-Hats.html

monster energy t shirts:
http://www.popbaseballhats.com/wholesale-101-b0-Monster-Energy-T-Shirts.html

and so on.on our site: http://www.popbaseballhats.com/


From chunuan723 at gmail.com  Fri Sep 16 22:58:59 2011
From: chunuan723 at gmail.com (he sharon)
Date: Fri, 16 Sep 2011 19:58:59 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <c81f9961-fd04-4b36-bc04-4ee7679c735e@w28g2000yqw.googlegroups.com>

our products:

red bull hats:  http://www.popbaseballhats.com/wholesale-113-b0-Red-Bull-Hats.html

red bull beanies: http://www.popbaseballhats.com/wholesale-112-b0-Red-Bull-Beanies.html

red bull t shirts: http://www.popbaseballhats.com/wholesale-114-b0-Red-Bull-T-Shirts.html

monster energy hats:
http://www.popbaseballhats.com/wholesale-100-b0-Monster-Energy-Hats.html

monster energy t shirts:
http://www.popbaseballhats.com/wholesale-101-b0-Monster-Energy-T-Shirts.html

and so on.on our site: http://www.popbaseballhats.com/



From ian.g.kelly at gmail.com  Fri Sep 16 23:11:44 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 21:11:44 -0600
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <j51030$gie$1@reader1.panix.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<mailman.1215.1316206402.27778.python-list@python.org>
	<j51030$gie$1@reader1.panix.com>
Message-ID: <CALwzidnzYvPL=TabXsQmc2m+86ZBTdWrj0tbQf-hkkwGbyTsUQ@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:19 PM, Grant Edwards <invalid at invalid.invalid> wrote:
>> Here's another one-liner using a generator instead of map:
>>
>> ? ? ?sum(int(c) for c in str(2**1000))
>
> Just in case you can't spare the 3KB required for the list of integers
> that map creates. :)
>
> In this case it doesn't matter, but it's not hard to find problems
> where the difference between the memory requirements for a generator
> and a map/list-comprehension are significant enough to worry about.

Unless otherwise specified, I generally assume that code on this list
is for Python 3, and map in Python 3 returns an iterator.

Cheers,
Ian


From vincent.vandevyvre at swing.be  Fri Sep 16 23:28:25 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sat, 17 Sep 2011 05:28:25 +0200
Subject: Different class 'str' between v3.
In-Reply-To: <CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
	<4E735490.4060509@swing.be>
	<CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>
Message-ID: <4E7413D9.4000706@swing.be>

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From vincent.vandevyvre at swing.be  Sat Sep 17 00:55:41 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sat, 17 Sep 2011 06:55:41 +0200
Subject: Different class 'str' between v3.
In-Reply-To: <4E7413D9.4000706@swing.be>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>	<4E735490.4060509@swing.be>	<CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>
	<4E7413D9.4000706@swing.be>
Message-ID: <4E74284D.7090900@swing.be>

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From alex.kapps at web.de  Sat Sep 17 02:59:10 2011
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 17 Sep 2011 08:59:10 +0200
Subject: strange results
In-Reply-To: <c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
	<c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
Message-ID: <4E74453E.2020908@web.de>

On 17.09.2011 01:09, Fig wrote:
> I took out all of the color commands that were in the shape functions
> and all of the features to the 'draw_house' function showed showed up.
> I started putting the color commands back into the shape functions and
> have no problems with some of them but when I put the color command
> back into others, some of the features start to disappear. As far as I
> can see, all of the code is right but I'm just a beginner so I am not
> for sure. Can anyone tell me why this is doing what it is.
>

Just tried your program on Ubuntu 10.04 with Python 2.6.5 and GASP 
0.3.3 and it worked fine. What OS, Python version and GASP version 
are you using?

If you don't get an answer here, try asking on the Launchpad project 
site:

https://launchpad.net/gasp


From ladasky at my-deja.com  Sat Sep 17 03:26:19 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 17 Sep 2011 00:26:19 -0700 (PDT)
Subject: Accessing matplotlib-users discussion group?
References: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>
	<d20cc76c-5ba6-4311-8459-0327134c8c49@u10g2000yqk.googlegroups.com>
	<9dhfchFvt2U1@mid.individual.net>
Message-ID: <03b8d48e-4fdf-4aaf-8249-367ac618d4f1@s3g2000vbx.googlegroups.com>

On Sep 16, 10:29?am, Martin Sch??n <martin.sch... at gmail.com> wrote:
> On 2011-09-15, John Ladasky <lada... at my-deja.com> wrote:
>
> > Hate to bump this, but... I found Sourceforge's IRC, and tried to ask
> > for help there, and it doesn't look like I can get any help until
> > business hours tomorrow. ?Anyone?
>
> No help really but I 'joined' Sourceforge about a year ago and
> had no problems whatsoever.
>
> Could it be some anti-robot filter that's gotten overly picky?
>
> /Martin

Well, I got through to Sourceforge today, and succeeded in
subscribing.  A support person said that their site's registration web
page has compatibility issues with certain web browsers and/or their
extensions.  I was using Chrome.  They asked me to try another
browser, I tried Firefox, and it worked.

Personally, I find that to be pretty bizarre -- but it worked.


From ladasky at my-deja.com  Sat Sep 17 04:34:18 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 17 Sep 2011 01:34:18 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<cc4b4a8d-4fa9-4377-b0d1-7b1d25d23a7b@cd4g2000vbb.googlegroups.com>
Message-ID: <fa6acd70-c555-4033-a3b9-43c5730010af@j8g2000yqa.googlegroups.com>

Hey, this pretty easy hack appears to work!

[code]

from multiprocessing.pool import Pool, RUN, MapResult, mapstar

class PriorityPool(Pool):

    def map_async_nowait(self, func, iterable, chunksize=None, \
        callback=None):
        """
        Same as map_async(), except uses put_nowait() and
        thus posts tasks to the head of the task queue
        rather than its tail.
        """
        assert self._state == RUN
        if not hasattr(iterable, '__len__'):
            iterable = list(iterable)

        if chunksize is None:
            chunksize, extra = divmod(len(iterable), len(self._pool) *
4)
            if extra:
                chunksize += 1

        task_batches = Pool._get_tasks(func, iterable, chunksize)
        result = MapResult(self._cache, chunksize, len(iterable), \
            callback)
        self._taskqueue.put_nowait((((result._job, i, mapstar, (x,),
{}) \
            for i, x in enumerate(task_batches)), None))
        return result

    def size(self):
        """
        This is not an essential function, but I use it in the
        demo to ensure that I initially create enough tasks to
        occupy every Process.
        """
        return len(self._pool)

##================================================================##

if __name__ == "__main__":

    from time import sleep

    def demo_task(args):
        num, time = args
        sleep(time)
        print num, time

    pool = PriorityPool()
    size = pool.size()
    print "\nConstructed a pool which contains", size, "Processes."
    print "Queueing", 2*size, "normal-priority tasks."
    normal = enumerate([3.0 + t for t in range(2*size)])
    pool.map_async(demo_task, normal, chunksize = 1)
    print "Queueing", size, "high-priority tasks."
    high = [(2*size + t, 0.2 + 0.1*t) for t in range(size)]
    pool.map_async_nowait(demo_task, high, chunksize = 1)
    sleep(30) # Give all tasks on the queue time to complete.
    print "Complete."

[/code]

Below is a typical output from my six-core CPU system.  The output
differs slightly from run to run -- that's multiprocessing for you,
it's asynchronous.

The tasks are given numbers which correspond to the order that they
are added to the queue.  The high-priority tasks are added last and
are thus numbered 12-17 (I place asterisks next to these in the
output, below).  Each task prints its number and its time when it
completes.  I expect the normal-priority tasks 0-5 to finish before
any high-priority tasks, and they always do.  Tasks 6 and 7 are then
interleaved among the high-priority tasks -- not quite what I expect,
but that may have something to do with my rather arbitrary choices of
sleep times.  But tasks 8-11 always get pushed to the back, and
complete last.

[output]

Constructed a pool which contains 6 Processes.
Queueing 12 normal-priority tasks.
Queueing 6 high-priority tasks.
0 3.0
1 4.0
2 5.0
3 6.0
4 7.0
5 8.0
6 9.0
12 0.2 *
13 0.3 *
14 0.4 *
15 0.5 *
7 10.0
16 0.6 *
17 0.7 *
8 11.0
9 12.0
10 13.0
11 14.0

[/output]

Please feel free to use this, though I would appreciate an
acknowledgment in your code if you do.  :^)


From phihag at phihag.de  Sat Sep 17 07:19:01 2011
From: phihag at phihag.de (Philipp Hagemeister)
Date: Sat, 17 Sep 2011 13:19:01 +0200
Subject: Code Review
In-Reply-To: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>
References: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>
Message-ID: <4E748225.8020602@phihag.de>

Instead of comments, you can often use docstrings
(http://www.python.org/dev/peps/pep-0257/ ):

This is hard to read due to the indentation, and cannot be accessed
programmatically:

#Update the GUI
    def update_gui(self, new_word):

Instead, use this:

    def update_gui(self, new_word):
        "Update the GUI."

Now, you can use help(Message) to get information about the method.
You'll notice "Update the GUI." is not helpfull at all for a method
called update_gui. Comments (and docstrings) that reproduce the method
name are not useful.

A couple of minor things:

* If you delete code, delete it, don't comment it out.
* Use newlines between two methods. Compare
def a(self):
  pass
def b(self):
  pass
def c(self):
  pass

with

def a(self):
  pass

def b(self):
  pass

def c(self):
  pass

The latter looks neat and not nearly as crammed as the former.
* Don't use newlines where they shouldn't be, for example in
                if val == 0:

                      label.unbind('<Button-1>')
* Even if it's just the comments, typos make a very bad impression of a
coder and the code. I'd automatically assume lots of bugs and untested
code when I see more than the occasional typo.
* GUI programming is fun, but does not lend itself to structured
programming and good practices. You should never use global. Instead,
have an object encapsulating the state and pass that object to the
method itself or its object.
* Don't commit .pyc files, they're totally useless. Since python 2.6,
you can add the following in your .bashrc to make python not create them:

export "PYTHONDONTWRITEBYTECODE=dont"

In git, you can add the following in your project's .gitignore or
~/.gitignore_global:

*.pyc

[More on .gitignore: http://help.github.com/ignore-files/ ]
* Otherwise, the code looks pretty good for a beginner. You may,
however, want to replace

def word_not_found(word):
      if word in searchedwordset:
        return 0
      else:
        return 1

with just:

def word_not_found(word):
  return word not in searchedwordset

(or just skip this method and write word not in searchedwordset).

Cheers,

Philipp



Emeka wrote:
> Hello All,
> 
> While learning Python I put together another Text Twist. I would want
> somebody to go through it and comment.
> https://github.com/janus/Text-Twist
> 
> 


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From rafadurancastaneda at gmail.com  Sat Sep 17 07:56:25 2011
From: rafadurancastaneda at gmail.com (=?ISO-8859-1?Q?Rafael_Dur=E1n_Casta=F1eda?=)
Date: Sat, 17 Sep 2011 13:56:25 +0200
Subject: create a directory structure
In-Reply-To: <4E73566A.1010808@gmail.com>
References: <4E732F4B.3090409@gmail.com>
	<4E73566A.1010808@gmail.com>
Message-ID: <CAH+GN=1iMF_q2AYyG_7pOjoCc=4PpPBvb9N7tacfVum9JRDH7g@mail.gmail.com>

2011/9/16 Andrea Crotti <andrea.crotti.0 at gmail.com>

> After some research, I think that paste-script is the best choice in this
> case.
>
> I can define templates and I'll get my directory structure nicely populated
> for me.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
I think you might want to look at
Fabric<http://docs.fabfile.org/en/1.2.2/index.html>or
vagrant <http://vagrantup.com/>
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From emekamicro at gmail.com  Sat Sep 17 09:26:23 2011
From: emekamicro at gmail.com (Emeka)
Date: Sat, 17 Sep 2011 14:26:23 +0100
Subject: Code Review
In-Reply-To: <4E748225.8020602@phihag.de>
References: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>
	<4E748225.8020602@phihag.de>
Message-ID: <CAOypoo7xWWuyhMNdb-VhKmfH-Xm+-rO_h0o8fe_GqewUZkybfQ@mail.gmail.com>

Philipp,

Thanks so much for your time and comment. I will re-work my code
accordingly.

Regards,
Emeka

On Sat, Sep 17, 2011 at 12:19 PM, Philipp Hagemeister <phihag at phihag.de>wrote:

> Instead of comments, you can often use docstrings
> (http://www.python.org/dev/peps/pep-0257/ ):
>
> This is hard to read due to the indentation, and cannot be accessed
> programmatically:
>
> #Update the GUI
>    def update_gui(self, new_word):
>
> Instead, use this:
>
>    def update_gui(self, new_word):
>        "Update the GUI."
>
> Now, you can use help(Message) to get information about the method.
> You'll notice "Update the GUI." is not helpfull at all for a method
> called update_gui. Comments (and docstrings) that reproduce the method
> name are not useful.
>
> A couple of minor things:
>
> * If you delete code, delete it, don't comment it out.
> * Use newlines between two methods. Compare
> def a(self):
>  pass
> def b(self):
>  pass
> def c(self):
>  pass
>
> with
>
> def a(self):
>  pass
>
> def b(self):
>  pass
>
> def c(self):
>  pass
>
> The latter looks neat and not nearly as crammed as the former.
> * Don't use newlines where they shouldn't be, for example in
>                if val == 0:
>
>                      label.unbind('<Button-1>')
> * Even if it's just the comments, typos make a very bad impression of a
> coder and the code. I'd automatically assume lots of bugs and untested
> code when I see more than the occasional typo.
> * GUI programming is fun, but does not lend itself to structured
> programming and good practices. You should never use global. Instead,
> have an object encapsulating the state and pass that object to the
> method itself or its object.
> * Don't commit .pyc files, they're totally useless. Since python 2.6,
> you can add the following in your .bashrc to make python not create them:
>
> export "PYTHONDONTWRITEBYTECODE=dont"
>
> In git, you can add the following in your project's .gitignore or
> ~/.gitignore_global:
>
> *.pyc
>
> [More on .gitignore: http://help.github.com/ignore-files/ ]
> * Otherwise, the code looks pretty good for a beginner. You may,
> however, want to replace
>
> def word_not_found(word):
>      if word in searchedwordset:
>        return 0
>      else:
>        return 1
>
> with just:
>
> def word_not_found(word):
>  return word not in searchedwordset
>
> (or just skip this method and write word not in searchedwordset).
>
> Cheers,
>
> Philipp
>
>
>
> Emeka wrote:
> > Hello All,
> >
> > While learning Python I put together another Text Twist. I would want
> > somebody to go through it and comment.
> > https://github.com/janus/Text-Twist
> >
> >
>
>
>


-- 
*Satajanus  Nig. Ltd


*
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From brandonfigura at gmail.com  Sat Sep 17 09:58:27 2011
From: brandonfigura at gmail.com (Fig)
Date: Sat, 17 Sep 2011 06:58:27 -0700 (PDT)
Subject: strange results
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
	<c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
	<mailman.1231.1316242745.27778.python-list@python.org>
Message-ID: <c9690798-a7a5-4d90-aa12-10f825b26c7d@o9g2000vbo.googlegroups.com>

On Sep 17, 1:59?am, Alexander Kapps <alex.ka... at web.de> wrote:
> On 17.09.2011 01:09, Fig wrote:
>
> > I took out all of the color commands that were in the shape functions
> > and all of the features to the 'draw_house' function showed showed up.
> > I started putting the color commands back into the shape functions and
> > have no problems with some of them but when I put the color command
> > back into others, some of the features start to disappear. As far as I
> > can see, all of the code is right but I'm just a beginner so I am not
> > for sure. Can anyone tell me why this is doing what it is.
>
> Just tried your program on Ubuntu 10.04 with Python 2.6.5 and GASP
> 0.3.3 and it worked fine. What OS, Python version and GASP version
> are you using?
>
> If you don't get an answer here, try asking on the Launchpad project
> site:
>
> https://launchpad.net/gasp

My OS is Windows 7, Python 2.7.2, I downloaded and installed the
python-gasp-0.2.0beta1.win32.exe file, and I also have these
installed: Python 2.7 pygame-1.9.2a0 and Python 2.7 pywin32-216


From yasar11732 at gmail.com  Sat Sep 17 11:10:31 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Sat, 17 Sep 2011 18:10:31 +0300
Subject: Modifiying __getattribute__ of an instance
Message-ID: <CAFEUn8atTaFVASzk8z5THLOLZVjiJv66Kd0e25pgTo6dQpsmPA@mail.gmail.com>

I am trying to modify __getattribute__() method for an instance, as you may
already know,__getattirbute__ is read-only attribute in Python. What I have
in mind is, create a new object like this:

def create_new_instace(old_instance):
    class temp(old_instance.__class__):
        def __init__(self,*args,**kwargs):
            "Since we will copy an already inited instance"
            pass
        def __getattribute__(self,attr):
           # do stuff
    new_instance = temp()
    # magically copy all attrs of old_instance to new_instance
    return new_instance

Is this kind of thing possible?
-- 
http://yasar.serveblog.net/
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From as at sci.fi  Sat Sep 17 11:25:11 2011
From: as at sci.fi (Anssi Saari)
Date: Sat, 17 Sep 2011 18:25:11 +0300
Subject: strange results
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
	<c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
	<mailman.1231.1316242745.27778.python-list@python.org>
	<c9690798-a7a5-4d90-aa12-10f825b26c7d@o9g2000vbo.googlegroups.com>
Message-ID: <vg3pqizi42v.fsf@coffee.modeemi.fi>

Fig <brandonfigura at gmail.com> writes:

> My OS is Windows 7, Python 2.7.2, I downloaded and installed the
> python-gasp-0.2.0beta1.win32.exe file, and I also have these
> installed: Python 2.7 pygame-1.9.2a0 and Python 2.7 pywin32-216

Then maybe that old beta version is your problem? For the record, your
code works for me too in Linux and python-gasp 0.3.3. 

Looks like there's no Windows installer for newer python-gasp. Maybe you
could install with easy_install as they describe on the site?


From missive at hotmail.com  Sat Sep 17 11:58:32 2011
From: missive at hotmail.com (Lee Harr)
Date: Sat, 17 Sep 2011 20:28:32 +0430
Subject: os independent rename
Message-ID: <SNT106-W65918A9483719408A59F5AB1090@phx.gbl>


I just got a bug report the heart of which is the
difference between unix and windows in using
os.rename

(ie, "On Windows, if dst already exists, OSError will be raised")

Hmm, I thought, maybe I'm supposed to use
shutil here. That is the "high-level" operations.
Unfortunately, shutil.move says it depends on
os.rename

So, what is the best way to do this that will
behave the same across operating systems?

 		 	   		  


From ian.g.kelly at gmail.com  Sat Sep 17 12:41:18 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 17 Sep 2011 10:41:18 -0600
Subject: os independent rename
In-Reply-To: <SNT106-W65918A9483719408A59F5AB1090@phx.gbl>
References: <SNT106-W65918A9483719408A59F5AB1090@phx.gbl>
Message-ID: <CALwzid=eg3cUd+eQULy6wNUyTshSVfhwor_yZrOm_sCam_gqag@mail.gmail.com>

On Sat, Sep 17, 2011 at 9:58 AM, Lee Harr <missive at hotmail.com> wrote:
>
> I just got a bug report the heart of which is the
> difference between unix and windows in using
> os.rename
>
> (ie, "On Windows, if dst already exists, OSError will be raised")
>
> Hmm, I thought, maybe I'm supposed to use
> shutil here. That is the "high-level" operations.
> Unfortunately, shutil.move says it depends on
> os.rename
>
> So, what is the best way to do this that will
> behave the same across operating systems?

shutil.move works for me, at least in Python 2.7.  The docstring
doesn't seem to match the code here:

    try:
        os.rename(src, real_dst)
    except OSError:
        if os.path.isdir(src):
            if _destinsrc(src, dst):
                raise Error, "Cannot move a directory '%s' into itself
'%s'." % (src, dst)
            copytree(src, real_dst, symlinks=True)
            rmtree(src)
        else:
            copy2(src, real_dst)
            os.unlink(src)


From invalid at invalid.invalid  Sat Sep 17 12:42:18 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 17 Sep 2011 16:42:18 +0000 (UTC)
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<mailman.1215.1316206402.27778.python-list@python.org>
	<j51030$gie$1@reader1.panix.com>
	<mailman.1228.1316229690.27778.python-list@python.org>
Message-ID: <j52ila$d5h$1@reader1.panix.com>

On 2011-09-17, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 8:19 PM, Grant Edwards <invalid at invalid.invalid> wrote:
>>> Here's another one-liner using a generator instead of map:
>>>
>>> ? ? ?sum(int(c) for c in str(2**1000))
>>
>> Just in case you can't spare the 3KB required for the list of integers
>> that map creates. :)
>>
>> In this case it doesn't matter, but it's not hard to find problems
>> where the difference between the memory requirements for a generator
>> and a map/list-comprehension are significant enough to worry about.
>
> Unless otherwise specified, I generally assume that code on this list
> is for Python 3, and map in Python 3 returns an iterator.

Indeed, I forgot about that (I'm still using Python 2 since I use some
libraries that haven't been ported).

-- 
Grant




From kw at codebykevin.com  Sat Sep 17 14:01:47 2011
From: kw at codebykevin.com (Kevin Walzer)
Date: Sat, 17 Sep 2011 14:01:47 -0400
Subject: Python bug in Windows 8--report now, or later?
Message-ID: <j52nab$bfc$1@dont-email.me>

I have been testing my Python application on the just-released developer 
preview of Windows 8 and have noted an error: the application does not 
create an app folder in the user's "application data" directory. This 
causes the app to crash on startup. Manually creating the directory 
solves the problem. Since the app uses an os.mkdir() call to create the 
directory, and since the app runs fine on Windows 7, my guess is that 
the bug lies somewhere in the interaction between Python (I'm using 
ActivePython 2.7) and Windows.

Here's the relevant code:

     #make preferences directory if it does not exist
     def makePrefsDir(self):
         self.appdir = os.path.join(os.path.join(os.environ['APPDATA'], 
'MyApp'))
         if not os.path.exists(self.appdir):
             os.mkdir(self.appdir)

I realize that this developer preview of Windows is still at somewhere 
between alpha- and beta-level, and it's possible things will get better. 
Should I wait to report this as a bug until Windows 8 is released, or do 
the Python developers test Python on pre-release versions of Windows?


From missive at hotmail.com  Sat Sep 17 14:40:02 2011
From: missive at hotmail.com (Lee Harr)
Date: Sat, 17 Sep 2011 23:10:02 +0430
Subject: os independent rename
Message-ID: <SNT106-W4986EA87740DAD686CC33AB1090@phx.gbl>


> shutil.move works for me, at least in Python 2.7.  The docstring> doesn't seem to match the code
Thanks for checking that.
Looks like there is a closed report about the misleading docs:http://bugs.python.org/issue12577
Closed a couple of months ago, but the docs have not madeit to the web yet....
 		 	   		  
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From shajiashish at gmail.com  Sat Sep 17 14:41:18 2011
From: shajiashish at gmail.com (Indian Entertainment)
Date: Sat, 17 Sep 2011 11:41:18 -0700 (PDT)
Subject: All Posters Com
Message-ID: <dc70c5c3-fa19-42f3-9ecc-14efd8e7dc8a@d12g2000vba.googlegroups.com>

With more than 1,000,000 images, AllPosters is your one-stop-shop for
wall art, providing a huge assortment of posters, art prints and other
items to suit all interests, decorating styles and budgets. Browse the
latest posters in music, movies, sports, and more. Find your favorite
art prints from the classic masters. Discover up-and-coming artists.
Explore our special collections. Then choose from a wide array of
custom-framing, canvas, wood-mounting and other service options to
truly make it your own ? all high quality and at amazing prices. Start
searching now and see for yourself how AllPosters is transforming the
way the world discovers and personalizes art. Check out the art we're
digging right now and what's on our gotta-hang-it list. We've narrowed
down the 1,000,000 options (and counting) on AllPosters.com to our
select favorites, including vintage posters, retro comics, Warhol
masterpieces and a samurai.

http://tinyurl.com/44skelw



From nobody at nowhere.com  Sat Sep 17 15:00:53 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 17 Sep 2011 20:00:53 +0100
Subject: Cancel or timeout a long running regular expression
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<mailman.1182.1316112919.27778.python-list@python.org>
	<pan.2011.09.16.13.57.05.761000@nowhere.com>
	<mailman.1221.1316210519.27778.python-list@python.org>
Message-ID: <pan.2011.09.17.19.00.55.828000@nowhere.com>

On Fri, 16 Sep 2011 18:01:27 -0400, Terry Reedy wrote:

> Now, can you write that as a heuristic *algorithm*
> def dangerous_re(some_re):?

	return re.search(r'\\\d', some_re) is not None

That will handle the most extreme case ;)

If the OP is serious about analysing regexps, sre_parse.parse() will
decompose a regexp to a more convenient form.

However, I wouldn't rely upon being able to catch every possible bad case.
The only robust solution is to use a separate process (threads won't
suffice, as they don't have a .kill() method).



From nobody at nowhere.com  Sat Sep 17 15:18:19 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 17 Sep 2011 20:18:19 +0100
Subject: os independent rename
References: <mailman.1236.1316275189.27778.python-list@python.org>
Message-ID: <pan.2011.09.17.19.18.21.518000@nowhere.com>

On Sat, 17 Sep 2011 20:28:32 +0430, Lee Harr wrote:

> So, what is the best way to do this that will
> behave the same across operating systems?

Delete the destination first, but after checking that it isn't the same as
the source.

On Windows, that last bit is harder than it seems. A string-based
comparison won't work. Even if you ignore case, there's the issue of 8.3
filenames, and some other odd cases.



From tjreedy at udel.edu  Sat Sep 17 17:19:26 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 17 Sep 2011 17:19:26 -0400
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j52nab$bfc$1@dont-email.me>
References: <j52nab$bfc$1@dont-email.me>
Message-ID: <j532t6$p50$1@dough.gmane.org>

On 9/17/2011 2:01 PM, Kevin Walzer wrote:
> I have been testing my Python application on the just-released developer
> preview of Windows 8 and have noted an error: the application does not
> create an app folder in the user's "application data" directory. This
> causes the app to crash on startup. Manually creating the directory
> solves the problem. Since the app uses an os.mkdir() call to create the
> directory, and since the app runs fine on Windows 7, my guess is that
> the bug lies somewhere in the interaction between Python (I'm using
> ActivePython 2.7) and Windows.

We need more that guesses to act. I think is premature to call this a 
'Python bug'.

> Here's the relevant code:
>
> #make preferences directory if it does not exist
> def makePrefsDir(self):
> self.appdir = os.path.join(os.path.join(os.environ['APPDATA'], 'MyApp'))
> if not os.path.exists(self.appdir):
> os.mkdir(self.appdir)
>
> I realize that this developer preview of Windows is still at somewhere
> between alpha- and beta-level, and it's possible things will get better.
> Should I wait to report this as a bug until Windows 8 is released, or do
> the Python developers test Python on pre-release versions of Windows?

3 days ago (Sept 14) someone asked about 'Windows 8 support' on pydev 
list. The answers were 1) 2.7 and 3.2 appear to run fine on the Dev 
release (but there was no report of test suite results); 2) Python 
directly uses so little of the Win interface that problems are not 
anticipated; 3) applications might have to make Win 8 specific 
adjustments and should test before the release.

Of course, if MS accidentally changes thinly wrapped system calls such 
as os.environ, .exists, and .makedir, there will be a problem but that 
is their bug. My impression is that they are not intentionally breaking 
such things.

I anticipate 3.3 and some future 2.7.z will be officially supported (and 
tested) on Win 8.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sat Sep 17 17:20:26 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 07:20:26 +1000
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j52nab$bfc$1@dont-email.me>
References: <j52nab$bfc$1@dont-email.me>
Message-ID: <CAPTjJmqhABsgGOSUsKKL6+wnF_sNyuOJ2VXi7j2nZzZMnUeeOA@mail.gmail.com>

On Sun, Sep 18, 2011 at 4:01 AM, Kevin Walzer <kw at codebykevin.com> wrote:
> I realize that this developer preview of Windows is still at somewhere
> between alpha- and beta-level, and it's possible things will get better.
> Should I wait to report this as a bug until Windows 8 is released, or do the
> Python developers test Python on pre-release versions of Windows?

I would consider reporting it as a bug in Windows 8, not a bug in Python.

Chris Angelico


From rosuav at gmail.com  Sat Sep 17 17:35:01 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 07:35:01 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
Message-ID: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>

On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:
> The only robust solution is to use a separate process (threads won't
> suffice, as they don't have a .kill() method).
>

Forking a thread to discuss threads.... ahem.

Why is it that threads can't be killed? Do Python threads correspond
to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
library I've seen has some way of killing threads, although I've not
looked in detail into POSIX threads there (there seem to be two
options, pthread_kill and pthread_cancel, that could be used, but I've
not used either). If nothing else, it ought to be possible to
implement a high level kill simply by setting a flag that the
interpreter will inspect every few commands, the same way that
KeyboardInterrupt is checked for.

Is it just that nobody's implemented it, or is there a good reason for
avoiding offering this sort of thing?

Chris Angelico


From clp2 at rebertia.com  Sat Sep 17 18:27:45 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 17 Sep 2011 15:27:45 -0700
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
Message-ID: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>

On Sat, Sep 17, 2011 at 2:35 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:
>> The only robust solution is to use a separate process (threads won't
>> suffice, as they don't have a .kill() method).
>
> Forking a thread to discuss threads.... ahem.
>
> Why is it that threads can't be killed? Do Python threads correspond
> to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
> library I've seen has some way of killing threads, although I've not
> looked in detail into POSIX threads there (there seem to be two
> options, pthread_kill and pthread_cancel, that could be used, but I've
> not used either). If nothing else, it ought to be possible to
> implement a high level kill simply by setting a flag that the
> interpreter will inspect every few commands, the same way that
> KeyboardInterrupt is checked for.
>
> Is it just that nobody's implemented it, or is there a good reason for
> avoiding offering this sort of thing?

It's possible that the reason is analogous to why Java has deprecated
its equivalent, Thread.stop():
http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

Cheers,
Chris


From rosuav at gmail.com  Sat Sep 17 19:19:46 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 09:19:46 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
Message-ID: <CAPTjJmpHJk6uwQwx7WxyHzjc7P=iFbnycgXAug-Jay6RQzEqGw@mail.gmail.com>

On Sun, Sep 18, 2011 at 8:27 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> It's possible that the reason is analogous to why Java has deprecated
> its equivalent, Thread.stop():
> http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

Interesting. The main argument against having a way to raise an
arbitrary exception in a different thread is that it gets around
Java's requirement to declare all exceptions that a routine might
throw - a requirement that Python doesn't have. So does that mean it'd
be reasonable to have a way to trigger a "TerminateThread" exception
(like SystemExit but for one thread) remotely? The above article
recommends polling a variable, but that's the exact sort of thing that
exceptions are meant to save you from doing.

ChrisA


From cs at zip.com.au  Sat Sep 17 19:23:38 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sun, 18 Sep 2011 09:23:38 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular expression)
In-Reply-To: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
References: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
Message-ID: <20110917232338.GA22838@cskk.homeip.net>

On 17Sep2011 15:27, Chris Rebert <clp2 at rebertia.com> wrote:
| On Sat, Sep 17, 2011 at 2:35 PM, Chris Angelico <rosuav at gmail.com> wrote:
| > On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:
| >> The only robust solution is to use a separate process (threads won't
| >> suffice, as they don't have a .kill() method).
| >
| > Forking a thread to discuss threads.... ahem.
| >
| > Why is it that threads can't be killed? Do Python threads correspond
| > to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
| > library I've seen has some way of killing threads, although I've not
| > looked in detail into POSIX threads there (there seem to be two
| > options, pthread_kill and pthread_cancel, that could be used, but I've
| > not used either). If nothing else, it ought to be possible to
| > implement a high level kill simply by setting a flag that the
| > interpreter will inspect every few commands, the same way that
| > KeyboardInterrupt is checked for.
| >
| > Is it just that nobody's implemented it, or is there a good reason for
| > avoiding offering this sort of thing?
| 
| It's possible that the reason is analogous to why Java has deprecated
| its equivalent, Thread.stop():
| http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

Interesting. A lot of that discussion concerns exceptions that the Java
app is unprepared for. Java's strong typing includes the throwable
exceptions, so that's a quite legitimate concern. The aborting mutex
regions thing is also very real. Conversely, Python can have unexpected
exceptions anywhere, anytime because it is not strongly typed in this
way. That doesn't make it magicly robust against this, but does mean
this is _already_ an issue in Python programs, threaded or otherwise.

Context managers can help a lot here, in that they offer a reliable
exception handler in a less ad hoc fashion than try/except because it
is tied to the locking object; but they won't magicly step in save
your basic:

  with my_lock:
    stuff...

Personally I'm of the view that thread stopping should be part of the
overt program logic, not a low level facility (such as causing a
ThreadDeath exception asynchronously). The latter has all the troubles
in the cited URL. Doing it overtly would go like this:

  ... outside ...
  that_thread.stop()    # sets the "stopping" flag on the thread object
  that_thread.join()    # and now maybe we wait for it...

  ... thread code ...
  ... do stuff, eg:
  with my_lock:
    muck about ...
  if thread.stopping:
    abort now, _outside_ the mutex
  ...

This avoids the issue of aborting in the middle of supposedly mutex-safe
code. It still requires scattering checks on thread.stopping through
library code such as the OP's rogue regexp evaluator.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

One measure of `programming complexity' is the number of mental objects you
have to keep in mind simultaneously in order to understand a program.  The
mental juggling act is one of the most difficult aspects of programming and
is the reason programming requires more concentration than other activities.
It is the reason programmers get upset about `quick interruptions' -- such
interruptions are tantamount to asking a juggler to keep three balls in the
air and hold your groceries at the same time.
        - Steve McConnell, _Code Complete_


From cs at zip.com.au  Sat Sep 17 19:27:54 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sun, 18 Sep 2011 09:27:54 +1000
Subject: os independent rename
In-Reply-To: <pan.2011.09.17.19.18.21.518000@nowhere.com>
References: <pan.2011.09.17.19.18.21.518000@nowhere.com>
Message-ID: <20110917232754.GA24525@cskk.homeip.net>

On 17Sep2011 20:18, Nobody <nobody at nowhere.com> wrote:
| On Sat, 17 Sep 2011 20:28:32 +0430, Lee Harr wrote:
| > So, what is the best way to do this that will
| > behave the same across operating systems?
| 
| Delete the destination first, but after checking that it isn't the same as
| the source.

This is usually a step that the UNIX os.rename is designed to avoid.
By deleting first, there is a window where the destination doesn't exist
at all. Also, if the subsequent rename fails, the destination is missing
long term. os.rename() on UNIX specifies that after the call either the
new items is at destination (success) or the old item is (failure).
Either way you still have a valid destination object.

So you're breaking the model that os.rename() strives explicitly to
provide.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Q: How many user support people does it take to change a light bulb?
A: We have an exact copy of the light bulb here and it seems to be
   working fine.  Can you tell me what kind of system you have?


From tjreedy at udel.edu  Sat Sep 17 19:30:31 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 17 Sep 2011 19:30:31 -0400
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmpHJk6uwQwx7WxyHzjc7P=iFbnycgXAug-Jay6RQzEqGw@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
	<CAPTjJmpHJk6uwQwx7WxyHzjc7P=iFbnycgXAug-Jay6RQzEqGw@mail.gmail.com>
Message-ID: <j53aiu$8b4$1@dough.gmane.org>

On 9/17/2011 7:19 PM, Chris Angelico wrote:
> On Sun, Sep 18, 2011 at 8:27 AM, Chris Rebert<clp2 at rebertia.com>  wrote:
>> It's possible that the reason is analogous to why Java has deprecated
>> its equivalent, Thread.stop():
>> http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html
>
> Interesting. The main argument against having a way to raise an
> arbitrary exception in a different thread is that it gets around
> Java's requirement to declare all exceptions that a routine might
> throw - a requirement that Python doesn't have.

I saw the main argument as being that stopping a thread at an arbitrary 
point can have an arbitrary, unpredictable effect on all other threads. 
And more so that shutting down an independent process.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sat Sep 17 19:38:05 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 09:38:05 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <j53aag$7n8$1@dough.gmane.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
Message-ID: <CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>

On Sun, Sep 18, 2011 at 9:26 AM, Dennis Lee Bieber
<wlfraed at ix.netcom.com> wrote:
> def threadWork(lock, a1, a2, rate):
> ? ? ? ?while True:
> ? ? ? ? ? ? ? ?time.sleep(rate)
> ? ? ? ? ? ? ? ?lock.lock()
> ? ? ? ? ? ? ? ?t = a2.balance / 2
> ? ? ? ? ? ? ? ?a1.balance += t
> ? ? ? ? ? ? ? ?#say a thread.kill kills at this point
> ? ? ? ? ? ? ? ?a2.balance -= t
> ? ? ? ? ? ? ? ?lock.release()
>

It's obviously going to be an issue with killing processes too, which
is why database engines have so much code specifically to protect
against this. But if it's done as an exception, all you need is to
catch that exception and reraise it:

def threadWork(lock, a1, a2, rate):
   try:
       while True:
               time.sleep(rate)
               lock.lock()
               t = a2.balance / 2
               a1.balance += t
               #say a thread.kill kills at this point
               a2.balance -= t
               lock.release()
  except:
      # roll back the transaction in some way
      lock.release()
      raise

It'd require some care in coding, but it could be done. And if the
lock/transaction object can be coded for it, it could even be done
automatically:

def threadWork(lock, a1, a2, rate):
       while True:
               time.sleep(rate)
               transaction.begin()
               t = a2.balance / 2
               transaction.apply(a1.balance,t)
               #say a thread.kill kills at this point
               transaction.apply(a2.balance,-t)
               transaction.commit()

If the transaction object doesn't get its commit() called, it does no
actions at all, thus eliminating all issues of locks.

Obviously there won't be any problem with the Python interpreter
itself (refcounts etc) if the kill is done by exception - that would
be a potential risk if using OS-level kills.

ChrisA


From python at mrabarnett.plus.com  Sat Sep 17 19:52:15 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 18 Sep 2011 00:52:15 +0100
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <j53aag$7n8$1@dough.gmane.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
Message-ID: <4E7532AF.8000707@mrabarnett.plus.com>

On 18/09/2011 00:26, Dennis Lee Bieber wrote:
> On Sun, 18 Sep 2011 07:35:01 +1000, Chris Angelico<rosuav at gmail.com>
> declaimed the following in gmane.comp.python.general:
>
>> Is it just that nobody's implemented it, or is there a good reason for
>> avoiding offering this sort of thing?
>>
> 	Any asynchronous "kill" runs the risk of leaving shared data
> structures in a corrupt state. {Stupid example, but, in pseudo-Python:
>
> import time
>
> class Account(object):
> 	def __init__(self, initial=0.0)
> 		self.balance = initial
>
> myAccount = Account(100.0)
> yourAccount = Account(100.0)
>
> accountLock = threading.Lock()
>
> def threadWork(lock, a1, a2, rate):
> 	while True:
> 		time.sleep(rate)
> 		lock.lock()
> 		t = a2.balance / 2
> 		a1.balance += t
> 		#say a thread.kill kills at this point
> 		a2.balance -= t
> 		lock.release()
>
> # create/start thread1 passing (accountLock, myAccount, yourAccount, 60)
> # create/start thread2 passing (accountLock, yourAccount, myAccount,
> 120)
>
> time.sleep(300)
> thread1.kill()
>
> 	So... Thread1 may be killed after one account gets incremented but
> before the other is decremented... And what happens to the lock? If it
> doesn't get released as part of the .kill() processing, they program is
> dead-locked (and the magically appearing money will never be seen). If
> it does get released, then the sum total of "money" in the system will
> have increased.
>
[snip]
The lock won't be released if an exception is raised, for example, if
'a1' isn't an Account instance and has no 'balance' attribute. Using a
context manager would help in that case.


From davea at ieee.org  Sat Sep 17 20:04:42 2011
From: davea at ieee.org (Dave Angel)
Date: Sat, 17 Sep 2011 20:04:42 -0400
Subject: os independent rename
In-Reply-To: <pan.2011.09.17.19.18.21.518000@nowhere.com>
References: <mailman.1236.1316275189.27778.python-list@python.org>
	<pan.2011.09.17.19.18.21.518000@nowhere.com>
Message-ID: <4E75359A.6060907@ieee.org>

On 01/-10/-28163 02:59 PM, Nobody wrote:
> On Sat, 17 Sep 2011 20:28:32 +0430, Lee Harr wrote:
>
>> So, what is the best way to do this that will
>> behave the same across operating systems?
> Delete the destination first, but after checking that it isn't the same as
> the source.
>
> On Windows, that last bit is harder than it seems. A string-based
> comparison won't work. Even if you ignore case, there's the issue of 8.3
> filenames, and some other odd cases.
>
>
Or rename it twice, with the intermediate file being something that does 
not exist.  For example, generate a random name, and if it exists, 
repeat till you come up with one that does not.  Once the first rename 
has succeeded, you can safely delete the destination.

Even this approach can have problems in the face of symlinks or multiple 
partitions.

DaveA



From missive at hotmail.com  Sat Sep 17 20:41:33 2011
From: missive at hotmail.com (Lee Harr)
Date: Sun, 18 Sep 2011 05:11:33 +0430
Subject: tool to point out os dependence problems?
Message-ID: <SNT106-W481FA47C49D828F61721BFB1080@phx.gbl>


One thing that I've always liked about python is that itmakes it?pretty easy to write programs that run acrossoperating?systems.
After running in to a problem today with os.renameI am wondering if there is a tool out there that canpoint out any known os dependence issues.
A quick trip to google shows nothing obvious.
 		 	   		  


From ladasky at my-deja.com  Sat Sep 17 23:06:27 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 17 Sep 2011 20:06:27 -0700 (PDT)
Subject: Python bug in Windows 8--report now, or later?
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
Message-ID: <49c99fa3-d0e0-4acb-b6fa-68959bbca52f@o9g2000vbo.googlegroups.com>

On Sep 17, 2:20?pm, Chris Angelico <ros... at gmail.com> wrote:

> I would consider reporting it as a bug in Windows 8, not a bug in Python.
>
> Chris Angelico

+1, beat me to it.  :^)


From invalid at invalid.invalid  Sun Sep 18 00:15:57 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Sun, 18 Sep 2011 04:15:57 +0000 (UTC)
Subject: Python bug in Windows 8--report now, or later?
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
Message-ID: <j53r9t$6v8$1@reader1.panix.com>

On 2011-09-17, Chris Angelico <rosuav at gmail.com> wrote:

> I would consider reporting it as a bug in Windows 8, not a bug in <whatever>

Good luck with that plan.  ;)

[I don't know anything about this particular issue, but I do know that
when there is a bug in Windows, it's usually everyboyd else that has
to change to work around it.]




From anikom15 at gmail.com  Sun Sep 18 00:40:32 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Sat, 17 Sep 2011 21:40:32 -0700
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j53r9t$6v8$1@reader1.panix.com>
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
	<j53r9t$6v8$1@reader1.panix.com>
Message-ID: <20110918044032.GA17257@Smoke>

On Sun, Sep 18, 2011 at 04:15:57AM +0000, Grant Edwards wrote:
> On 2011-09-17, Chris Angelico <rosuav at gmail.com> wrote:
> 
> > I would consider reporting it as a bug in Windows 8, not a bug in <whatever>
> 
> Good luck with that plan.  ;)
> 
> [I don't know anything about this particular issue, but I do know that
> when there is a bug in Windows, it's usually everyboyd else that has
> to change to work around it.]
> 
>

Actually Microsoft usually goes out of its way to ensure backwards-
compatibily, even when the app developer is DOING IT WRONG.


From alec.taylor6 at gmail.com  Sun Sep 18 01:42:00 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sun, 18 Sep 2011 15:42:00 +1000
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <20110918044032.GA17257@Smoke>
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
	<j53r9t$6v8$1@reader1.panix.com> <20110918044032.GA17257@Smoke>
Message-ID: <CAO+9iGfQpBnnvpvai7jqvOGnM0OTdLGxAQ9x5hnL9gy+pyQsCA@mail.gmail.com>

On Sun, Sep 18, 2011 at 2:40 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> On Sun, Sep 18, 2011 at 04:15:57AM +0000, Grant Edwards wrote:
>> On 2011-09-17, Chris Angelico <rosuav at gmail.com> wrote:
>>
>> > I would consider reporting it as a bug in Windows 8, not a bug in <whatever>
>>
>> Good luck with that plan. ?;)
>>
>> [I don't know anything about this particular issue, but I do know that
>> when there is a bug in Windows, it's usually everyboyd else that has
>> to change to work around it.]
>>
>>
>
> Actually Microsoft usually goes out of its way to ensure backwards-
> compatibily, even when the app developer is DOING IT WRONG.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

For those interested, Windows 8 is available here:
http://msdn.microsoft.com/windows/apps/br229516/


From dreyemi at gmail.com  Sun Sep 18 05:39:03 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 10:39:03 +0100
Subject: Getting a list value from key/value pair
Message-ID: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>

Hi all,

If I have a list with key/value pair, how do I get the value of the key?

I'm working with this code snippet:

>>> items = {'fees':[('status','pending'), ('timeout',60)],
'hostel':[('status',
 'pending'), ('timeout','120')]}
>>> print [items[i] for i in items.keys()]
[[('status', 'pending'), ('timeout', '120')], [('status', 'pending'),
('timeout'
, 60)]]
>>>

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From r32813 at freescale.com  Sun Sep 18 05:41:30 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Sun, 18 Sep 2011 09:41:30 +0000
Subject: Python 2.7.1 64-bit Build on HP-UX11.31 ia64 with aCC - Many
	modules failed to build
In-Reply-To: <mailman.0.1316338420.1409.python-list@python.org>
References: <mailman.0.1316338420.1409.python-list@python.org>
Message-ID: <02EA6D704E30CE499C5071776509A925F52AAB@039-SN1MPN1-003.039d.mgd.msft.net>

Hello there,

I have posted this in Compiler SIG and re-post here in case anyone who knows about this issue is not subscribed to that group. 

I am working on python build on my server using HP-UX ANSI C Compiler. I want to be consistent using aCC throughout instead of gcc for my python and cx_Oracle build as Oracle is not supporting gcc build much. Here is my aCC version.

# swlist -l product | grep Compiler
  ACXX                  C.06.26.EVAL   HP C/aC++ Compiler
  C-ANSI-C              C.06.26.EVAL   HP C/aC++ Compiler
  COMPLIBS              B.11.31        Compiler Support Libraries

Anyhow, my issue now is when I am building my python in 64-bit, I am encountering many modules failed to build issue, despite the python executable is successfully built. There are just so many modules that failed, that I would conclude my build failed. :P

I followed through the instruction in README file for 64-bit build using HP-UX compiler (--without-gcc option is used in configure). I exported and unexported the environment variables before configure and make is run, respectively. I also removed -O option in the Makefile before running make.

I have a few questions.

1.) Why Makefile is re-generated after python executable is created? I noticed the removal of optimization flag in Makefile is gone/restored after python binary is generated.

2.) 64-bit option. It seems that this is a bad flag that linker doesn't recognize? Many important modules failed to build, and I believe its due to this error. When I manually execute ld without passing in +DD64 flag, the module is generated successfull.


ld -b +DD64 -lxnet build/temp.hp-ux-B.11.31-ia64-2.7/home/r32813/Build/2.7.1/Python-2.7.1/Modules/mathmodule.o build/temp.hp-ux-B.11.31-ia64-2.7/home/r32813/Build/2.7.1/Python-2.7.1/Modules/_math.o -L/usr/local/lib -lm -o build/lib.hp-ux-B.11.31-ia64-2.7/math.so
ld: Unrecognized argument: +DD64
Fatal error.

Above is just showing one of the modules that failed to build.

3.) Built in modules, I see the compiler cannot find the bit of information required to build _tkinter module. How do I make the configure able to locate my tcl/tk source code or binary which I have already installed and built separately (and successfully)? So, where do I place the source code if I need to put it so that the compiler can find?

To end my question, here is the outcome of my build. For build in modules, I just need my _tkinter running. For shared libraries, I think  need most of them, those are the basic functions that my application calls.

Thanks in advance for your reply.

Python build finished, but the necessary bits to build these modules were not found:
_bsddb             _curses            _curses_panel  
_sqlite3           _ssl               _tkinter       
bsddb185           bz2                dl             
gdbm               imageop            linuxaudiodev  
ossaudiodev        readline           spwd           
sunaudiodev        zlib                              
To find the necessary bits, look in setup.py in detect_modules() for the module's name.


Failed to build these modules:
_bisect            _codecs_cn         _codecs_hk     
_codecs_iso2022    _codecs_jp         _codecs_kr     
_codecs_tw         _collections       _csv           
_ctypes            _ctypes_test       _elementtree   
_functools         _heapq             _hotshot       
_io                _json              _locale        
_lsprof            _md5               _multibytecodec
_multiprocessing   _random            _sha           
_socket            _struct            _testcapi      
array              audioop            binascii       
cmath              cPickle            crypt          
cStringIO          datetime           dbm            
fcntl              future_builtins    grp            
itertools          math               mmap           
nis                operator           parser         
pyexpat            resource           select         
strop              syslog             termios        
time               unicodedata              




From t at jollybox.de  Sun Sep 18 06:16:09 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sun, 18 Sep 2011 12:16:09 +0200
Subject: Getting a list value from key/value pair
In-Reply-To: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
Message-ID: <4E75C4E9.60209@jollybox.de>

On 18/09/11 11:39, Kayode Odeyemi wrote:
> Hi all,
> 
> If I have a list with key/value pair, how do I get the value of the key?
> 
> I'm working with this code snippet:

Python 3.2.2 (default, Sep  5 2011, 04:33:58)
[GCC 4.6.1 20110819 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> lst = [ ('key1', 'value1'), ('key2', 'value2') ]
>>> d = dict (lst)
>>> d['key1']
'value1'
>>>


> 
>>>> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>>>> print [items[i] for i in items.keys()]
> [[('status', 'pending'), ('timeout', '120')], [('status', 'pending'),
> ('timeout'
> , 60)]]
>>>>
> 
> -- 
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
> 
> 
> 



From vincent.vandevyvre at swing.be  Sun Sep 18 06:22:00 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sun, 18 Sep 2011 12:22:00 +0200
Subject: Getting a list value from key/value pair
In-Reply-To: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
Message-ID: <4E75C648.7070000@swing.be>

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From vincent.vandevyvre at swing.be  Sun Sep 18 06:25:41 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sun, 18 Sep 2011 12:25:41 +0200
Subject: Getting a list value from key/value pair
In-Reply-To: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
Message-ID: <4E75C725.2050903@swing.be>

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From dreyemi at gmail.com  Sun Sep 18 06:30:06 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 11:30:06 +0100
Subject: Getting a list value from key/value pair
In-Reply-To: <4E75C648.7070000@swing.be>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
	<4E75C648.7070000@swing.be>
Message-ID: <CAPbrmCsiN7KNOS=DB=uGtBxzmTtE6xVF=pqKz1yLVGvQuQKDzA@mail.gmail.com>

On Sun, Sep 18, 2011 at 11:22 AM, Vincent Vande Vyvre <
vincent.vandevyvre at swing.be> wrote:

> **
> Le 18/09/11 11:39, Kayode Odeyemi a ?crit :
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> Like that:
>
> # -*- coding: utf-8 -*-
>
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> for key, value in items.iteritems():
>     print "\n {0}".format(key)
>     for val in value:
>         print "\t{0}:  {1}".format(val[0], val[1])
>
> for python 2.x
>

Thank you very much :)


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From andrea.crotti.0 at gmail.com  Sun Sep 18 06:44:59 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Sun, 18 Sep 2011 11:44:59 +0100
Subject: create a directory structure
In-Reply-To: <CAH+GN=1iMF_q2AYyG_7pOjoCc=4PpPBvb9N7tacfVum9JRDH7g@mail.gmail.com>
References: <4E732F4B.3090409@gmail.com> <4E73566A.1010808@gmail.com>
	<CAH+GN=1iMF_q2AYyG_7pOjoCc=4PpPBvb9N7tacfVum9JRDH7g@mail.gmail.com>
Message-ID: <4E75CBAB.6060204@gmail.com>

On 09/17/2011 12:56 PM, Rafael Dur?n Casta?eda wrote:
> I think you might want to look at Fabric 
> <http://docs.fabfile.org/en/1.2.2/index.html> or vagrant 
> <http://vagrantup.com/>
>
>

Thanks, but I don't understand how these two project would help me...
I don't need to deploy on many machines via ssh, I only need that each 
machine is able to create an initial infrastructure.

Paste-script allows me to do that, and in plus is ready to do many other 
things.
Doing it in a hand-made fashion might also work well, but I think using 
paste-script is better for future extensions/improvements.
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From dreyemi at gmail.com  Sun Sep 18 06:50:53 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 11:50:53 +0100
Subject: Getting a list value from key/value pair
In-Reply-To: <4E75C725.2050903@swing.be>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
	<4E75C725.2050903@swing.be>
Message-ID: <CAPbrmCuqgY=VPEUo_fO=sNxzuQ7QKaLmrwxFJz=HUkUbhrpzTA@mail.gmail.com>

On Sun, Sep 18, 2011 at 11:25 AM, Vincent Vande Vyvre <
vincent.vandevyvre at swing.be> wrote:

> **
> Le 18/09/11 11:39, Kayode Odeyemi a ?crit :
>
> Hi all,
>
>
> If I have a list with key/value pair, how do I get the value of the key?
>
>
> I'm working with this code snippet:
>
> >>> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
> >>> print [items[i] for i in items.keys()]
> [[('status', 'pending'), ('timeout', '120')], [('status', 'pending'),
> ('timeout'
> , 60)]]
> >>>
>
> --
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>
>  Sorry, for python3.x
>
> # -*- coding: utf-8 -*-
>
>
> d = {'fees':[('status','pending'), ('timeout',60)], 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> for key, value in d.items():
>
>     print("\n {0}".format(key))
>     for val in value:
>         print("\t{0}:  {1}".format(val[0], val[1]))
>
> Very helpful! I gave your karma at
http://stackoverflow.com/questions/7460675/getting-a-list-value-from-key-value-pair

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From dickinsm at gmail.com  Sun Sep 18 08:13:03 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 18 Sep 2011 05:13:03 -0700 (PDT)
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<mailman.1213.1316204268.27778.python-list@python.org>
Message-ID: <4be23f78-5eea-44db-b659-6bd8f7ab3752@15g2000vbb.googlegroups.com>

On Sep 16, 9:17?pm, Arnaud Delobelle <arno... at gmail.com> wrote:
> Ah go on, let's make a codegolf contest out of it.
> My entry:
>
> >>> sum(map(int,str(2**1000)))

You could save another character by replacing "2**1000" with "2<<999"

--
Mark


From dreyemi at gmail.com  Sun Sep 18 08:44:50 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 13:44:50 +0100
Subject: Getting a list value from key/value pair
In-Reply-To: <4E75C648.7070000@swing.be>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
	<4E75C648.7070000@swing.be>
Message-ID: <CAPbrmCvhun2AmaAKCTtJbr335Dc1weQFTAJzZrDZ8XkpVBpbfw@mail.gmail.com>

On Sun, Sep 18, 2011 at 11:22 AM, Vincent Vande Vyvre <
vincent.vandevyvre at swing.be> wrote:

> **
> Le 18/09/11 11:39, Kayode Odeyemi a ?crit :
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> Like that:
>
> # -*- coding: utf-8 -*-
>
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> for key, value in items.iteritems():
>     print "\n {0}".format(key)
>     for val in value:
>         print "\t{0}:  {1}".format(val[0], val[1])
>
> for python 2.x
>

Vincent, with:

values =  ('status', 'pending') ('timeout', '120') ('status', 'pending')
('timeout', 60)

How do I comma separate it and put each each item in a dict?

>>> for key, value in items.iteritems():
...     for val in value:
...             md = {}
...             for q in val:
...                     md.update(q)
...                     print md
...
Traceback (most recent call last):
  File "<stdin>", line 5, in <module>
ValueError: dictionary update sequence element #0 has length 1; 2 is
required

Thank you

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From python at bdurham.com  Sun Sep 18 09:50:40 2011
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 18 Sep 2011 09:50:40 -0400
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <pan.2011.09.17.19.00.55.828000@nowhere.com>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com><mailman.1182.1316112919.27778.python-list@python.org><pan.2011.09.16.13.57.05.761000@nowhere.com><mailman.1221.1316210519.27778.python-list@python.org>
	<pan.2011.09.17.19.00.55.828000@nowhere.com>
Message-ID: <1316353840.13565.140258142485365@webmail.messagingengine.com>

Thanks for everyone's comments - much appreciated!

Malcolm (the OP)


From arnodel at gmail.com  Sun Sep 18 10:10:10 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sun, 18 Sep 2011 15:10:10 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <4be23f78-5eea-44db-b659-6bd8f7ab3752@15g2000vbb.googlegroups.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<mailman.1213.1316204268.27778.python-list@python.org>
	<4be23f78-5eea-44db-b659-6bd8f7ab3752@15g2000vbb.googlegroups.com>
Message-ID: <CAJ6cK1YrR3hhctrZRj0gdNNMUUA77T64vxp01PtN7qinRyXMKg@mail.gmail.com>

On Sep 18, 2011 1:20 PM, "Mark Dickinson" <dickinsm at gmail.com> wrote:
>
> On Sep 16, 9:17 pm, Arnaud Delobelle <arno... at gmail.com> wrote:
> > Ah go on, let's make a codegolf contest out of it.
> > My entry:
> >
> > >>> sum(map(int,str(2**1000)))
>
> You could save another character by replacing "2**1000" with "2<<999"
>

Excellent!

-- 
Arnaud
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From anbumani923 at gmail.com  Sun Sep 18 10:30:34 2011
From: anbumani923 at gmail.com (anbu)
Date: Sun, 18 Sep 2011 07:30:34 -0700 (PDT)
Subject: 2011 NEW MODAL  GIRLS SEX VIDEO AND PICTURES FREE DOWNLOAD
Message-ID: <c6249206-6c58-4ead-b4dd-dbc66cac9e1c@d12g2000vba.googlegroups.com>

http://123maza.com/65/cute540/


From zdoor at xs4all.nl  Sun Sep 18 11:55:08 2011
From: zdoor at xs4all.nl (Alex van der Spek)
Date: Sun, 18 Sep 2011 17:55:08 +0200
Subject: Numpy.array with dtype works on list of tuples not on list of lists?
Message-ID: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>

Why does this not work?

>>> dat=[[1,2,3],[4,5,6]]
>>> col=[('a','f4'),('b','f4'),('c','f4')]
>>> arr=numpy.array(dat,dtype=col)

Traceback (most recent call last):
  File "<pyshell#91>", line 1, in <module>
    arr=numpy.array(dat,dtype=col)
TypeError: expected a readable buffer object
>>> 

But this does:

>>> dat=[(1,2,3),(4,5,6)]
>>> arr=numpy.array(dat,dtype=col)
>>> arr
array([(1.0, 2.0, 3.0), (4.0, 5.0, 6.0)], 
      dtype=[('a', '<f4'), ('b', '<f4'), ('c', '<f4')])
>>> 

The only difference that the object is a list of tuples now?

Thanks for clarification,
Alex van der Spek




From rosuav at gmail.com  Sun Sep 18 13:55:16 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 19 Sep 2011 03:55:16 +1000
Subject: GTK2.TextView examples
In-Reply-To: <1316367199.2789.YahooMailRC@web83811.mail.sp1.yahoo.com>
References: <1316367199.2789.YahooMailRC@web83811.mail.sp1.yahoo.com>
Message-ID: <CAPTjJmr9s3AsqqiUa=tvew4pEK8ZqHgOMvm9T4niqu7s0s-FJg@mail.gmail.com>

On Mon, Sep 19, 2011 at 3:33 AM, Lance Dillon <riffraff169 at yahoo.com> wrote:
> Here are some examples that use GTK2.TextTag.

Interestingly, neither runs on my Windows system - I don't have GDK2
or Pango. Much appreciate the examples though - can some of them go
into the official docs?

It may well be that I'm using completely the wrong tools here. What I
want to do is write a console in Pike, more or less a telnet/MUD
client. Is it better to use TextView, or to use a GdkDisplay or
somesuch and draw the text myself?

ChrisA


From philip at semanchuk.com  Sun Sep 18 13:57:10 2011
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 18 Sep 2011 13:57:10 -0400
Subject: Numpy.array with dtype works on list of tuples not on list of
	lists?
In-Reply-To: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
References: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
Message-ID: <119665A7-EF5F-49D4-9B59-83C8D21EEA8A@semanchuk.com>


On Sep 18, 2011, at 11:55 AM, Alex van der Spek wrote:

> Why does this not work?
> 
>>>> dat=[[1,2,3],[4,5,6]]
>>>> col=[('a','f4'),('b','f4'),('c','f4')]
>>>> arr=numpy.array(dat,dtype=col)
> 
> Traceback (most recent call last):
> File "<pyshell#91>", line 1, in <module>
>   arr=numpy.array(dat,dtype=col)
> TypeError: expected a readable buffer object
> 
> But this does:
> 
>>>> dat=[(1,2,3),(4,5,6)]
>>>> arr=numpy.array(dat,dtype=col)
>>>> arr
> array([(1.0, 2.0, 3.0), (4.0, 5.0, 6.0)],      dtype=[('a', '<f4'), ('b', '<f4'), ('c', '<f4')])
> 
> The only difference that the object is a list of tuples now?

I don't know why you're seeing what you're seeing, but if you don't get answer here you could try asking on the numpy list. 

Good luck
Philip



From matt.pounsett at gmail.com  Sun Sep 18 16:19:24 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Sun, 18 Sep 2011 13:19:24 -0700 (PDT)
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
	<mailman.1152.1316066053.27778.python-list@python.org>
Message-ID: <731ee8c8-3f8d-49ad-91a9-4e247f66d252@bl1g2000vbb.googlegroups.com>

On Sep 15, 1:54?am, Ryan Kelly <r... at rfk.id.au> wrote:
> To be friendlier to others reading your code, I would consider using a
> classmethod to create an alternative constructor:

I finally got back to looking at this today.  As it turns out, un-
overriding __new__ in the child class is more complicated than I first
expected, and isn't worth the extra effort.  So, I ended up using a
constructor class method as you suggested.

Thanks again!


From robert.kern at gmail.com  Sun Sep 18 16:31:58 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Sun, 18 Sep 2011 15:31:58 -0500
Subject: Numpy.array with dtype works on list of tuples not on list of
	lists?
In-Reply-To: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
References: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
Message-ID: <j55kfu$rnh$1@dough.gmane.org>

On 9/18/11 10:55 AM, Alex van der Spek wrote:
> Why does this not work?
>
>>>> dat=[[1,2,3],[4,5,6]]
>>>> col=[('a','f4'),('b','f4'),('c','f4')]
>>>> arr=numpy.array(dat,dtype=col)
>
> Traceback (most recent call last):
> File "<pyshell#91>", line 1, in <module>
> arr=numpy.array(dat,dtype=col)
> TypeError: expected a readable buffer object
>>>>
>
> But this does:
>
>>>> dat=[(1,2,3),(4,5,6)]
>>>> arr=numpy.array(dat,dtype=col)
>>>> arr
> array([(1.0, 2.0, 3.0), (4.0, 5.0, 6.0)], dtype=[('a', '<f4'), ('b', '<f4'),
> ('c', '<f4')])
>>>>
>
> The only difference that the object is a list of tuples now?

numpy questions are best asked on the numpy mailing list:

   http://www.scipy.org/Mailing_Lists

To answer your question, though, numpy.array() needs to figure out a lot of 
different things about the input data simultaneously, in particular its shape. 
Structured arrays (i.e. with elements that have individual fields as above) pose 
a new problem in that its individual elements are sequences themselves. In order 
to help it decide whether it should recurse down into a sequence to find its 
elements or decide that the sequence *is* an element in its own right, we 
settled on the convention that tuples are to be considered elements and that 
lists are sequences of elements.

-- 
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 keymint1498 at gmail.com  Sun Sep 18 17:07:22 2011
From: keymint1498 at gmail.com (superhappyfuntime)
Date: 18 Sep 2011 21:07:22 GMT
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
	<38d9k8-u8t.ln1@satorlaser.homedns.org>
Message-ID: <nemo-18092011170700@nemo.com>

On 09-15-2011, Ulrich Eckhardt <ulrich.eckhardt at dominolaser.com> wrote:

> superhappyfuntime wrote:
>>  #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.

> It's LaTeX, not Python.

> Uli

no, it's a cap for LaTeX written in python


-- 
I'm trying a new usenet client for Mac, Nemo OS X, since 0 days.
You can download it at http://www.malcom-mac.com/nemo


From resourts137 at gmail.com  Sun Sep 18 17:54:25 2011
From: resourts137 at gmail.com (iqbal iqbal)
Date: Sun, 18 Sep 2011 14:54:25 -0700 (PDT)
Subject: Booking cheapest airlines Tickets Pakistan world wide
Message-ID: <ab413f46-2405-4ba9-9bcb-f6ec43c78c19@s16g2000yqc.googlegroups.com>

Booking cheapest airlines Tickets Pakistan world wide
http://karachi-guest-house-5star-hotels.blogspot.com/


From steve+comp.lang.python at pearwood.info  Sun Sep 18 18:00:51 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 18 Sep 2011 22:00:51 GMT
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
	<38d9k8-u8t.ln1@satorlaser.homedns.org> <nemo-18092011170700@nemo.com>
Message-ID: <4e766a13$0$29995$c3e8da3$5496439d@news.astraweb.com>

On Sun, 18 Sep 2011 21:07:22 +0000, superhappyfuntime wrote:

> On 09-15-2011, Ulrich Eckhardt <ulrich.eckhardt at dominolaser.com> wrote:
> 
>> superhappyfuntime wrote:
>>>  #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.
> 
>> It's LaTeX, not Python.
> 
>> Uli
> 
> no, it's a cap for LaTeX written in python

If it's Python, it's no Python syntax I've ever seen before.


>>> here it is: = '\begin{document}'
  File "<stdin>", line 1
    here it is: = '\begin{document}'
          ^
SyntaxError: invalid syntax


How about if you start off by explaining what you think "a cap for LaTeX" 
means, or provide a link to something that will explain it? This is a 
Python list, and we don't necessarily know much about LaTeX.



-- 
Steven



From irmen.NOSPAM at xs4all.nl  Sun Sep 18 19:05:20 2011
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Mon, 19 Sep 2011 01:05:20 +0200
Subject: ANN: Pyro 4.9 released
Message-ID: <4e767930$0$2480$e4fe514c@news2.news.xs4all.nl>

Hello,

Pyro 4.9 has just been released!

Get it from Pypi:  http://pypi.python.org/pypi/Pyro4/
Documentation: http://packages.python.org/Pyro4/index.html

Changes include:

* the documentation has finally been completed
* changed asyncresult a little in non-compatible ways.
* added more examples: gui_eventloop, deadlock, itunes
* serialized data is released a bit faster to improve garbage collection
* fixed setting several socket options such as SO_REUSEADDR.

(See the change log in the documentation for a more detailed list)


Pyro = Python Remote Objects. It is a library that enables you to build applications in
which objects can talk to each other over the network, with minimal programming effort.
You can just use normal Python method calls, with almost every possible parameter and
return value type, and Pyro takes care of locating the right object on the right
computer to execute the method. It is designed to be very easy to use, and to generally
stay out of your way. But it also provides a set of powerful features that enables you
to build distributed applications rapidly and effortlessly. Pyro is written in 100% pure
Python and therefore runs on many platforms and Python versions, including Python 3.x.


Enjoy,

Irmen de Jong



From ian.g.kelly at gmail.com  Mon Sep 19 01:41:29 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sun, 18 Sep 2011 23:41:29 -0600
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
Message-ID: <CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>

On Sat, Sep 17, 2011 at 5:38 PM, Chris Angelico <rosuav at gmail.com> wrote:
> But if it's done as an exception, all you need is to
> catch that exception and reraise it:
>
> def threadWork(lock, a1, a2, rate):
> ? try:
> ? ? ? while True:
> ? ? ? ? ? ? ? time.sleep(rate)
> ? ? ? ? ? ? ? lock.lock()
> ? ? ? ? ? ? ? t = a2.balance / 2
> ? ? ? ? ? ? ? a1.balance += t
> ? ? ? ? ? ? ? #say a thread.kill kills at this point
> ? ? ? ? ? ? ? a2.balance -= t
> ? ? ? ? ? ? ? lock.release()
> ?except:
> ? ? ?# roll back the transaction in some way
> ? ? ?lock.release()
> ? ? ?raise

And what if the thread gets killed a second time while it's in the except block?

> It'd require some care in coding, but it could be done. And if the
> lock/transaction object can be coded for it, it could even be done
> automatically:
>
> def threadWork(lock, a1, a2, rate):
> ? ? ? while True:
> ? ? ? ? ? ? ? time.sleep(rate)
> ? ? ? ? ? ? ? transaction.begin()
> ? ? ? ? ? ? ? t = a2.balance / 2
> ? ? ? ? ? ? ? transaction.apply(a1.balance,t)
> ? ? ? ? ? ? ? #say a thread.kill kills at this point
> ? ? ? ? ? ? ? transaction.apply(a2.balance,-t)
> ? ? ? ? ? ? ? transaction.commit()
>
> If the transaction object doesn't get its commit() called, it does no
> actions at all, thus eliminating all issues of locks.

And what if the thread gets killed in the middle of the commit?

Getting the code right is going to be a lot more complicated than just
adding a couple of try/excepts.

Cheers,
Ian


From greg.ewing at canterbury.ac.nz  Mon Sep 19 01:56:42 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 19 Sep 2011 17:56:42 +1200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <mailman.1272.1316410920.27778.python-list@python.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>	<j53aag$7n8$1@dough.gmane.org>	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<mailman.1272.1316410920.27778.python-list@python.org>
Message-ID: <9do3stFtq8U1@mid.individual.net>

Ian Kelly wrote:

> And what if the thread gets killed a second time while it's in the except block?

> And what if the thread gets killed in the middle of the commit?

For these kinds of reasons, any feature for raising asynchronous
exceptions in another thread would need to come with some related
facilites:

* A way of blocking asynchronous exceptions around a critical
   section would be needed.

* Once an asynchronous exception has been raised, further
   asynchronous exceptions should be blocked until explicitly
   re-enabled.

* Asynchronous exceptions should probably be disabled initially
   in a new thread until it explicitly enables them.

Some care would still be required to write code that is robust
in the presence of asynchronous exceptions, but given these
facilities, it ought to be possible.

-- 
Greg


From adam.jorgensen.za at gmail.com  Mon Sep 19 02:03:08 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Mon, 19 Sep 2011 08:03:08 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
Message-ID: <CAMX1Romi8H1c4YC5co_TVUHu8LtCndRjib5Uw=Hxdf=sUmLueA@mail.gmail.com>

The point of the Java thread.stop() being deprecated seems to have very
little to do with undeclared exceptions being raised and a lot to do
with objects being left in a potentially damaged state.

As Ian said, it's a lot more complex than just adding try/catches. Killing a
thread in the middle of some non-atomic operation with side-effects
that propagate beyond the thread is a recipe for trouble.

In fact, while a a lot can be written about Java being a poor language the
specific article linked to about why Java deprecated thread.stop()
gives a pretty damn good explanation as to why Thread.stop() and the like
are a bad idea and what a better idea might be (Signalling that
a graceful halt should be attempted)
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From rosuav at gmail.com  Mon Sep 19 02:25:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 19 Sep 2011 16:25:59 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
Message-ID: <CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>

On Mon, Sep 19, 2011 at 3:41 PM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> And what if the thread gets killed in the middle of the commit?
>

Database managers solved this problem years ago. It's not done by
preventing death until you're done - death can come from someone
brutally pulling out your power cord. There's no "except
PowerCordRemoved" to protect you from that!

There are various ways, and I'm sure one of them will work for
whatever situation is needed.

ChrisA


From geek.swarup at gmail.com  Mon Sep 19 02:38:53 2011
From: geek.swarup at gmail.com (swarupchandra kamerkar)
Date: Mon, 19 Sep 2011 12:08:53 +0530
Subject: Need help on using the USB module
Message-ID: <CAK2biOMifAik-ZNd+4WAm6MMEBuKvdgnzA1t5Zyf6YQiRGsHkA@mail.gmail.com>

Hi,
   I am trying to use Pythoin on windows.
   I wanted to use the uSB module.

   I downloaded it and installed it.

   Still I get the following message.

 >>> import usb
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    import usb
ImportError: DLL load failed: The specified module could not be found.

What is it that I am missing?

Regards
Swarup
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From Shambhu.Rajak at kpitcummins.com  Mon Sep 19 03:03:10 2011
From: Shambhu.Rajak at kpitcummins.com (Shambhu Rajak)
Date: Mon, 19 Sep 2011 07:03:10 +0000
Subject: What is wrong with this code?
In-Reply-To: <4e766a13$0$29995$c3e8da3$5496439d@news.astraweb.com>
References: <nemo-15092011085110@nemo.com>
	<38d9k8-u8t.ln1@satorlaser.homedns.org> <nemo-18092011170700@nemo.com>
	<4e766a13$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <408F64D89899604FB24015E64E10490C0329A3@KCHJEXMB02.kpit.com>

I think you cannnot use "\" as normal string ,it?s a metacharacter, u can use it like this:
'\\begin{document}'

-Shambhu
-----Original Message-----
From: Steven D'Aprano [mailto:steve+comp.lang.python at pearwood.info] 
Sent: Monday, September 19, 2011 3:31 AM
To: python-list at python.org
Subject: Re: What is wrong with this code?

On Sun, 18 Sep 2011 21:07:22 +0000, superhappyfuntime wrote:

> On 09-15-2011, Ulrich Eckhardt <ulrich.eckhardt at dominolaser.com> wrote:
> 
>> superhappyfuntime wrote:
>>>  #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.
> 
>> It's LaTeX, not Python.
> 
>> Uli
> 
> no, it's a cap for LaTeX written in python

If it's Python, it's no Python syntax I've ever seen before.


>>> here it is: = '\begin{document}'
  File "<stdin>", line 1
    here it is: = '\begin{document}'
          ^
SyntaxError: invalid syntax


How about if you start off by explaining what you think "a cap for LaTeX" 
means, or provide a link to something that will explain it? This is a 
Python list, and we don't necessarily know much about LaTeX.



-- 
Steven





From chunuan723 at gmail.com  Mon Sep 19 05:15:16 2011
From: chunuan723 at gmail.com (he sharon)
Date: Mon, 19 Sep 2011 02:15:16 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <3138b9b7-7b69-411a-a63f-f0c12cfbe56a@1g2000yqm.googlegroups.com>

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From Antoon.Pardon at rece.vub.ac.be  Mon Sep 19 06:04:01 2011
From: Antoon.Pardon at rece.vub.ac.be (Antoon Pardon)
Date: Mon, 19 Sep 2011 12:04:01 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular expression)
In-Reply-To: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
Message-ID: <20110919100401.GD3410@trout.vub.ac.be>

On Sun, Sep 18, 2011 at 07:35:01AM +1000, Chris Angelico wrote:
> On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:

> Forking a thread to discuss threads.... ahem.
> 
> Why is it that threads can't be killed? Do Python threads correspond
> to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
> library I've seen has some way of killing threads, although I've not
> looked in detail into POSIX threads there (there seem to be two
> options, pthread_kill and pthread_cancel, that could be used, but I've
> not used either). If nothing else, it ought to be possible to
> implement a high level kill simply by setting a flag that the
> interpreter will inspect every few commands, the same way that
> KeyboardInterrupt is checked for.
> 
> Is it just that nobody's implemented it, or is there a good reason for
> avoiding offering this sort of thing?

Python has a half baked solution to this. If you go to

  http://docs.python.org/release/3.2.2/c-api/init.html

You will find the following:

int PyThreadState_SetAsyncExc(long id, PyObject *exc)

  Asynchronously raise an exception in a thread. The id argument is
the thread id of the target thread; exc is the exception object to be
raised. This function does not steal any references to exc. To prevent
naive misuse, you must write your own C extension to call this. Must be
called with the GIL held. Returns the number of thread states modified;
this is normally one, but will be zero if the thread id isn?t found. If
exc is NULL, the pending exception (if any) for the thread is cleared.
This raises no exceptions.

Some recipes can be found at:

  http://www.google.com/search?ie=UTF-8&oe=utf-8&q=python+recipe+PyThreadState_SetAsyncExc

However it this doesn't work 100% correctly. Last time I tried
using this, it didn't work with an exception instance but
only with an execption class as parameter. There was a discussion at

  http://mail.python.org/pipermail/python-dev/2006-August/068158.html

about this. I don't know how it was finaly resolved.

-- 
Antoon Pardon


From hfaber at invalid.net  Mon Sep 19 07:11:51 2011
From: hfaber at invalid.net (Henrik Faber)
Date: Mon, 19 Sep 2011 13:11:51 +0200
Subject: Operator commutativity
Message-ID: <j5781l$opq$1@speranza.aioe.org>

Hi there,

when I have a python class X which overloads an operator, I can use that
operator to do any operation for example with an integer

y = X() + 123

however, say I want the "+" operator to be commutative. Then

y = 123 + X()

should have the same result. However, since it does not call __add__ on
an instance of X, but on the int 123, this fails:

TypeError: unsupported operand type(s) for +: 'int' and 'X'

How can I make this commutative?

Best regards,
Henrik


From arnodel at gmail.com  Mon Sep 19 07:17:22 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Mon, 19 Sep 2011 12:17:22 +0100
Subject: Operator commutativity
In-Reply-To: <j5781l$opq$1@speranza.aioe.org>
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <CAJ6cK1ZQuGw1mRpMTWSDP+QP7R9e4CHd3hqxJ4zwvJQo-tOmWQ@mail.gmail.com>

On 19 September 2011 12:11, Henrik Faber <hfaber at invalid.net> wrote:
> Hi there,
>
> when I have a python class X which overloads an operator, I can use that
> operator to do any operation for example with an integer
>
> y = X() + 123
>
> however, say I want the "+" operator to be commutative. Then
>
> y = 123 + X()
>
> should have the same result. However, since it does not call __add__ on
> an instance of X, but on the int 123, this fails:
>
> TypeError: unsupported operand type(s) for +: 'int' and 'X'
>
> How can I make this commutative?

Overload X.__radd__() as well

HTH

-- 
Arnaud


From paul.nospam at rudin.co.uk  Mon Sep 19 07:23:48 2011
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Mon, 19 Sep 2011 12:23:48 +0100
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>

Henrik Faber <hfaber at invalid.net> writes:


> How can I make this commutative?

Incidentally - this isn't really about commutativity at all - the
question is how can you define both left and right versions of add,
irrespective of whether they yield the same result.

I think __radd__ is what you're after.


From duncan.booth at invalid.invalid  Mon Sep 19 07:26:08 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 19 Sep 2011 11:26:08 GMT
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <Xns9F657E7852D0Fduncanbooth@127.0.0.1>

Henrik Faber <hfaber at invalid.net> wrote:

> Hi there,
> 
> when I have a python class X which overloads an operator, I can use that
> operator to do any operation for example with an integer
> 
> y = X() + 123
> 
> however, say I want the "+" operator to be commutative. Then
> 
> y = 123 + X()
> 
> should have the same result. However, since it does not call __add__ on
> an instance of X, but on the int 123, this fails:
> 
> TypeError: unsupported operand type(s) for +: 'int' and 'X'
> 
> How can I make this commutative?
> 
By defining __radd__

>>> class X:
	def __add__(self, other):
		return "%r + %r" % (self, other)
	def __radd__(self, other):
		return "%r + %r" % (other, self)

	
>>> X() + 123
'<__main__.X object at 0x029C45B0> + 123'
>>> 123 + X()
'123 + <__main__.X object at 0x02101910>'


-- 
Duncan Booth http://kupuguy.blogspot.com


From hfaber at invalid.net  Mon Sep 19 07:32:00 2011
From: hfaber at invalid.net (Henrik Faber)
Date: Mon, 19 Sep 2011 13:32:00 +0200
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
Message-ID: <j5797e$s57$1@speranza.aioe.org>

On 19.09.2011 13:23, Paul Rudin wrote:
> Henrik Faber <hfaber at invalid.net> writes:
> 
>> How can I make this commutative?
> 
> Incidentally - this isn't really about commutativity at all - the
> question is how can you define both left and right versions of add,
> irrespective of whether they yield the same result.

Right. The operator+ in my case just happens to be commutative and I
wanted a language way to express this.

> I think __radd__ is what you're after.

It is, thank you very much - I knew there was some way to get this done
nicely. Perfect! :-)

Best regards,
Henrik


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From roy at panix.com  Mon Sep 19 08:10:27 2011
From: roy at panix.com (Roy Smith)
Date: Mon, 19 Sep 2011 08:10:27 -0400
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
Message-ID: <roy-C1FD55.08102719092011@news.panix.com>

In article <j5797e$s57$1 at speranza.aioe.org>,
 Henrik Faber <hfaber at invalid.net> wrote:

> On 19.09.2011 13:23, Paul Rudin wrote:
> > Henrik Faber <hfaber at invalid.net> writes:
> > 
> >> How can I make this commutative?
> > 
> > Incidentally - this isn't really about commutativity at all - the
> > question is how can you define both left and right versions of add,
> > irrespective of whether they yield the same result.
> 
> Right. The operator+ in my case just happens to be commutative and I
> wanted a language way to express this.
> 
> > I think __radd__ is what you're after.
> 
> It is, thank you very much - I knew there was some way to get this done
> nicely. Perfect! :-)

__radd__() only solves the problem if the left-hand operand has no 
__add__() method itself.

class C1:
    def __add__(self, other):
        print "C1.__add__()"
    def __radd__(self, other):
        print "C1.__radd__()"

class C2:
    def __add__(self, other):
        print "C2.__add__()"
    def __radd__(self, other):
        print "C2.__radd__()"

c1 = C1()
c2 = C2()

c1 + c2
c2 + c1

$ python radd.py
C1.__add__()
C2.__add__()


From robin at reportlab.com  Mon Sep 19 08:42:30 2011
From: robin at reportlab.com (Robin Becker)
Date: Mon, 19 Sep 2011 13:42:30 +0100
Subject: help needed on decimal formatting issue
Message-ID: <4E7738B6.2080000@chamonix.reportlab.co.uk>

I'm not really very used to the decimal module so I'm asking here if any one can 
help me with a problem in a well known third party web framework

The code in question is

def format_number(value, max_digits, decimal_places):
     """
     Formats a number into a string with the requisite number of digits and
     decimal places.
     """
     if isinstance(value, decimal.Decimal):
         context = decimal.getcontext().copy()
         context.prec = max_digits
         return u'%s' % str(
          value.quantize(decimal.Decimal(".1") ** decimal_places,
                        context=context))
     else:
         return u"%.*f" % (decimal_places, value)


we have set up decimal fields with max_digits=7 decimal_places=2 and 
max_digits=10, decimal_places=4. We are getting issues with quantize failing 
with the message 'quantize result has too many digits for current context'.

Anyhow, I believe that we need to adjust the above code so that the precision is 
actually set to

     context.prec = max_digits+decimal_places

but I'm not certain that is right. Presumably the author thought that the fields 
could have large values of both max_digits and decimal_places. Initially I 
thought precision must be to do with decimal_places only, but changing
     context.prec = decimal_places

did not fix the issue. Can someone enlighten me? The failing case for the 
original code was

format_number(Decimal('914146.80'),7,2)

with context.prec = decimal_places we failed differently with

format_number(Decimal('42.7571'),10,4)

so I adopted context.prec = max_digits+decimal_places and that seems to work. If 
this is indeed a proper fix I will send a bug report to the well known jazz 
based framework.
-- 
Robin Becker



From ethan at stoneleaf.us  Mon Sep 19 08:48:07 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Mon, 19 Sep 2011 05:48:07 -0700
Subject: Operator commutativity
In-Reply-To: <roy-C1FD55.08102719092011@news.panix.com>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
Message-ID: <4E773A07.6090505@stoneleaf.us>

Roy Smith wrote:
> In article <j5797e$s57$1 at speranza.aioe.org>,
>  Henrik Faber <hfaber at invalid.net> wrote:
> 
>> On 19.09.2011 13:23, Paul Rudin wrote:
>>> Henrik Faber <hfaber at invalid.net> writes:
>>>
>>>> How can I make this commutative?
>>> Incidentally - this isn't really about commutativity at all - the
>>> question is how can you define both left and right versions of add,
>>> irrespective of whether they yield the same result.
>> Right. The operator+ in my case just happens to be commutative and I
>> wanted a language way to express this.
>>
>>> I think __radd__ is what you're after.
>> It is, thank you very much - I knew there was some way to get this done
>> nicely. Perfect! :-)
> 
> __radd__() only solves the problem if the left-hand operand has no 
> __add__() method itself.

Only true if the left-hand operand is so ill-behaved it doesn't check to 
see if it makes sense to add itself to the right-hand operand.  If it 
doesn't know how, it should `return NotImplemented` -- Python will then 
try __radd__ on the left-hand operand.

Also, if the right-hand operand is a subclass of the left-hand operand 
then Python will try right-hand_operand.__radd__ first.

Now, if the left-hand operand *does* know how (or thinks it does, which 
could be another matter entirely), and the right-hand operand is *not* a 
subclass of the left-hand operand, then you are correct -- the 
right-hand operand wil not be called.

~Ethan~


From brian.curtin at gmail.com  Mon Sep 19 10:00:25 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Mon, 19 Sep 2011 09:00:25 -0500
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j52nab$bfc$1@dont-email.me>
References: <j52nab$bfc$1@dont-email.me>
Message-ID: <CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>

On Sat, Sep 17, 2011 at 13:01, Kevin Walzer <kw at codebykevin.com> wrote:
> I have been testing my Python application on the just-released developer
> preview of Windows 8 and have noted an error: the application does not
> create an app folder in the user's "application data" directory. This causes
> the app to crash on startup. Manually creating the directory solves the
> problem. Since the app uses an os.mkdir() call to create the directory, and
> since the app runs fine on Windows 7, my guess is that the bug lies
> somewhere in the interaction between Python (I'm using ActivePython 2.7) and
> Windows.
>
> Here's the relevant code:
>
> ? ?#make preferences directory if it does not exist
> ? ?def makePrefsDir(self):
> ? ? ? ?self.appdir = os.path.join(os.path.join(os.environ['APPDATA'],
> 'MyApp'))
> ? ? ? ?if not os.path.exists(self.appdir):
> ? ? ? ? ? ?os.mkdir(self.appdir)
>
> I realize that this developer preview of Windows is still at somewhere
> between alpha- and beta-level, and it's possible things will get better.
> Should I wait to report this as a bug until Windows 8 is released, or do the
> Python developers test Python on pre-release versions of Windows?

First, is your application actually crashing, or does it just exit due
to an unhandled exception? I suspect the latter, so if that's true,
what's the exception and message?

You said "the application does not create an app folder in the user's
'application data' directory" -- what does this mean, or rather, what
is the specific folder you're expecting to have? If Python can't
create the directory but you can do it manually, there may be some
permission or access differences new to Windows 8. What does "echo
%APPDATA%" give you?

I haven't installed Windows 8 yet, but I'm planning to get it up and
running soon. If you submit issues to http://bugs.python.org,
hopefully with specific test cases that we can run and work with,
it'll be easier to track and fix. If you do that, add me to the nosy
list on the issues - tracker id: brian.curtin, I'm one of the Windows
people around there.


From torpedoallen at gmail.com  Mon Sep 19 11:21:10 2011
From: torpedoallen at gmail.com (Christian Ren)
Date: Mon, 19 Sep 2011 08:21:10 -0700 (PDT)
Subject: help for the parse of encrypted excel
Message-ID: <e221bb1b-33c5-4dfe-8785-bb4bf1cb031a@fi7g2000vbb.googlegroups.com>

I used xlrd library for the parse of excel before. But now, I
encounter a problem that the file has been encrypted for some security
reason. On the official website, i found "xlrd will not attempt to
decode password-protected (encrypted) files. " :((
And I also tried another library called pyExcelerator, Unfortunately,
it failed all the same.
Is there anybody can tell me what's the solution to the parse of
encrypted excel? Thanks in advance.
(PS: for the user experience reason, I don't hope to save this file as
another copy)


From tjreedy at udel.edu  Mon Sep 19 11:25:04 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 19 Sep 2011 11:25:04 -0400
Subject: Operator commutativity
In-Reply-To: <4E773A07.6090505@stoneleaf.us>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<4E773A07.6090505@stoneleaf.us>
Message-ID: <j57msh$no4$1@dough.gmane.org>

On 9/19/2011 8:48 AM, Ethan Furman wrote:
> Roy Smith wrote:

>> __radd__() only solves the problem if the left-hand operand has no
>> __add__() method itself.
>
> Only true if the left-hand operand is so ill-behaved it doesn't check to
> see if it makes sense to add itself to the right-hand operand. If it
> doesn't know how, it should `return NotImplemented` -- Python will then
> try __radd__ on the left-hand operand.
>
> Also, if the right-hand operand is a subclass of the left-hand operand
> then Python will try right-hand_operand.__radd__ first.

The builtin classes like int are (should be, sans bug) well-behaved.

> Now, if the left-hand operand *does* know how (or thinks it does, which
> could be another matter entirely), and the right-hand operand is *not* a
> subclass of the left-hand operand, then you are correct -- the
> right-hand operand wil not be called.

So the potential problems arise with two user classes.

-- 
Terry Jan Reedy



From mdickinson at enthought.com  Mon Sep 19 12:12:01 2011
From: mdickinson at enthought.com (Mark Dickinson)
Date: Mon, 19 Sep 2011 09:12:01 -0700 (PDT)
Subject: help needed on decimal formatting issue
References: <mailman.1282.1316436173.27778.python-list@python.org>
Message-ID: <150e2270-84a7-45ae-ae56-681f0b26c62a@1g2000vbu.googlegroups.com>

On Sep 19, 1:42?pm, Robin Becker <ro... at reportlab.com> wrote:
> I'm not really very used to the decimal module so I'm asking here if any one can
> help me with a problem in a well known third party web framework
>
> The code in question is
>
> def format_number(value, max_digits, decimal_places):
> ? ? ?"""
> ? ? ?Formats a number into a string with the requisite number of digits and
> ? ? ?decimal places.
> ? ? ?"""
> ? ? ?if isinstance(value, decimal.Decimal):
> ? ? ? ? ?context = decimal.getcontext().copy()
> ? ? ? ? ?context.prec = max_digits
> ? ? ? ? ?return u'%s' % str(
> ? ? ? ? ? value.quantize(decimal.Decimal(".1") ** decimal_places,
> ? ? ? ? ? ? ? ? ? ? ? ? context=context))
> ? ? ?else:
> ? ? ? ? ?return u"%.*f" % (decimal_places, value)

What's the meaning of the 'max_digits' argument here?  Are you
guaranteed that the incoming value is smaller than 10**max_digits in
absolute value?

If so, then a precision of max_digits + decimal_places + 1 should be
enough.  The +1 is there to cover the corner case where a value close
to 10**max_digits is rounded up to 10**max_digits by the quantize
operation.

BTW, that's a fairly horrible way of creating the first argument to
the quantize method, too.  It would be more efficient to do something
like:

>>> decimal_places = 2
>>> decimal.Decimal('0.{}1'.format('0'*(decimal_places-1)))
Decimal('0.01')

(perhaps with suitable special-casing for the case where
decimal_places <= 0;  not sure whether this applies in your context).

--
Mark


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From anikom15 at gmail.com  Mon Sep 19 12:45:53 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Mon, 19 Sep 2011 09:45:53 -0700
Subject: Operator commutativity
In-Reply-To: <j5781l$opq$1@speranza.aioe.org>
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <20110919164553.GA20521@Smoke>

On Mon, Sep 19, 2011 at 01:11:51PM +0200, Henrik Faber wrote:
> Hi there,
> 
> when I have a python class X which overloads an operator, I can use that
> operator to do any operation for example with an integer
> 
> y = X() + 123
> 
> however, say I want the "+" operator to be commutative. Then
> 
> y = 123 + X()
> 
> should have the same result. However, since it does not call __add__ on
> an instance of X, but on the int 123, this fails:
> 
> TypeError: unsupported operand type(s) for +: 'int' and 'X'
> 
> How can I make this commutative?
> 
> Best regards,
> Henri

def __radd__(self, other):
    return self.__add__(self, other)


From bahamutzero8825 at gmail.com  Mon Sep 19 16:40:00 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Mon, 19 Sep 2011 15:40:00 -0500
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
References: <j52nab$bfc$1@dont-email.me>
	<CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
Message-ID: <4E77A8A0.3030104@gmail.com>

On 2011.09.19 09:00 AM, Brian Curtin wrote:
> You said "the application does not create an app folder in the user's
> 'application data' directory" -- what does this mean, or rather, what
> is the specific folder you're expecting to have? If Python can't
> create the directory but you can do it manually, there may be some
> permission or access differences new to Windows 8. What does "echo
> %APPDATA%" give you?
I booted up the Win8 dev preview in a VM and os.environ['appdata'] gives
me the same result it would for Windows 7. Perhaps the problem lies in
the os.path.exists() call (that is, Win8 and Win7 react differently to
this call). I personally would try to create the directory and then
catch either a WindowsError (error 183) or an OSError (error 17) if the
directory already exists. I might play around with this later and post
some results.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2
PGP/GPG Public Key ID: 0xF88E034060A78FCB


From nobody at nowhere.com  Mon Sep 19 17:54:49 2011
From: nobody at nowhere.com (Nobody)
Date: Mon, 19 Sep 2011 22:54:49 +0100
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular	expression)
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<mailman.1272.1316410920.27778.python-list@python.org>
Message-ID: <pan.2011.09.19.21.54.48.390000@nowhere.com>

On Sun, 18 Sep 2011 23:41:29 -0600, Ian Kelly wrote:

>> If the transaction object doesn't get its commit() called, it does no
>> actions at all, thus eliminating all issues of locks.
> 
> And what if the thread gets killed in the middle of the commit?

The essence of a commit is that it involves an atomic operation, for which
there is no "middle".



From ian.g.kelly at gmail.com  Mon Sep 19 18:04:17 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 19 Sep 2011 16:04:17 -0600
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
	<CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>
Message-ID: <CALwzidkqoYmq8UAmsphB2SaHv9SwmGm+FyiVoXuFqURUOFDqnA@mail.gmail.com>

On Mon, Sep 19, 2011 at 12:25 AM, Chris Angelico <rosuav at gmail.com> wrote:
> On Mon, Sep 19, 2011 at 3:41 PM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
>> And what if the thread gets killed in the middle of the commit?
>>
>
> Database managers solved this problem years ago. It's not done by
> preventing death until you're done - death can come from someone
> brutally pulling out your power cord. There's no "except
> PowerCordRemoved" to protect you from that!

I'm aware of that.  I'm not saying it's impossible, just that the
example you gave is over-simplified, as writing atomic transactional
logic is a rather complex topic.  There may be an existing Python
library to handle this, but I'm not aware of one.

"PowerCordRemoved" is not relevant here, as that would kill the entire
process, which renders the issue of broken shared data within a
continuing process rather moot.

Cheers,
Ian


From bahamutzero8825 at gmail.com  Mon Sep 19 18:38:32 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Mon, 19 Sep 2011 17:38:32 -0500
Subject: logging.config and {-style formatting
Message-ID: <4E77C468.30709@gmail.com>

Is it possible to use {-style formatting with a logging config file? I
can add style='{' to a logging.Formatter() call and it works fine, but I
see no way of doing this from a config file. I tried adding a style
option in the config file, but it has no effect. I see no mention of the
{-style in the logging.config docs, so am I right to assume {-style
formatting is not implemented in logging.config?

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From mindwalkernine at gmail.com  Mon Sep 19 19:13:06 2011
From: mindwalkernine at gmail.com (Jordan Evans)
Date: Mon, 19 Sep 2011 18:13:06 -0500
Subject: Dynamically Cause A Function To Return
Message-ID: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>

I want dynamically place the 'return' statement in a function via user input
or achieve the same through some other means.  If some other means, the user
must be able initiate this at runtime during a raw_input().  This is what I
have so far, this would be an awesome command line debugging tool if I can
get it to work.

def b(label="", *args):
    """Used to create breaks for debugging.  Will break the function or
continue the function it is place within based on user input.  Has as a
input loop for querying variables and executing code before a break or a
continue."""
    print label+":",
    for arg in args:
        print str(arg),
    if len(args):
        print
    x = ""
    while x != ".":
        command = raw_input()
        try:
            exec command
        except:
            pass
-------------- next part --------------
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From sridharr at activestate.com  Mon Sep 19 19:27:40 2011
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Mon, 19 Sep 2011 16:27:40 -0700
Subject: ANN: ActivePython 3.2.2.3 is now available
Message-ID: <9643CBF5-DC47-4A59-93B9-1610031E4ACF@activestate.com>

ActiveState is pleased to announce ActivePython 3.2.2.3, a complete, ready-to-install binary distribution of Python 3.2.

  http://www.activestate.com/activepython/downloads


What's New in ActivePython-3.2.2.3
==================================

New Features & Upgrades
-----------------------

- Upgrade to Python 3.2.2 (`release notes
 <http://hg.python.org/cpython/file/v3.2.2/Misc/NEWS>`__)
- [Windows] Security upgrade to openssl-1.0.0e
- Upgraded the following packages:

 - Distribute-0.6.21
 - virtualenv-1.6.4

What is ActivePython?
=====================

ActivePython is ActiveState's binary distribution of Python. Builds for Windows, Mac OS X, Linux are made freely available. Solaris, HP-UX and AIX builds, and access to older versions are available in ActivePython Business, Enterprise and OEM editions:

  http://www.activestate.com/python

ActivePython includes the Python core and the many core extensions: zlib and bzip2 for data compression, the Berkeley DB (bsddb) and SQLite (sqlite3) database libraries, OpenSSL bindings for HTTPS support, the Tix GUI widgets for Tkinter, ElementTree for XML processing, ctypes (on supported platforms) for low-level library access, and others. The Windows distribution ships with PyWin32 -- a suite of Windows tools developed by Mark Hammond, including bindings to the Win32 API and Windows COM.

ActivePython also includes a binary package manager for Python (PyPM) that can be used to install packages much easily. For example:

  C:\>pypm install numpy
  [...]

  C:\>python
  >>> import numpy.linalg
  >>>

See this page for full details:

  http://docs.activestate.com/activepython/3.2/whatsincluded.html

As well, ActivePython ships with a wealth of documentation for both new and experienced Python programmers. In addition to the core Python docs, ActivePython includes the "What's New in Python" series, "Dive into Python", the Python FAQs & HOWTOs, and the Python Enhancement Proposals (PEPs).

An online version of the docs can be found here:

  http://docs.activestate.com/activepython/3.2/

We would welcome any and all feedback to:

  activepython-feedback at activestate.com

Please file bugs against ActivePython at:

  http://bugs.activestate.com/enter_bug.cgi?product=ActivePython

Supported Platforms
===================

ActivePython is available for the following platforms:

- Windows (x86 and x64)
- Mac OS X (x86 and x86_64; 10.5+)
- Linux (x86 and x86_64)

- Solaris/SPARC (32-bit and 64-bit) (Business, Enterprise or OEM edition only)
- Solaris/x86 (32-bit) (Business, Enterprise or OEM edition only)
- HP-UX/PA-RISC (32-bit) (Business, Enterprise or OEM edition only)
- HP-UX/IA-64 (32-bit and 64-bit) (Enterprise or OEM edition only)
- AIX/PowerPC (32-bit and 64-bit) (Business, Enterprise or OEM edition only)

More information about the Business Edition can be found here:

  http://www.activestate.com/business-edition

Custom builds are available in the Enterprise Edition:

  http://www.activestate.com/enterprise-edition

Thanks, and enjoy!

The Python Team

--
Sridhar Ratnakumar
sridharr at activestate.com

From rosuav at gmail.com  Mon Sep 19 20:18:02 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 20 Sep 2011 10:18:02 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CALwzidkqoYmq8UAmsphB2SaHv9SwmGm+FyiVoXuFqURUOFDqnA@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
	<CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>
	<CALwzidkqoYmq8UAmsphB2SaHv9SwmGm+FyiVoXuFqURUOFDqnA@mail.gmail.com>
Message-ID: <CAPTjJmpu6+7z9+0NKCWphYq50xO5gynMo_4uaMCS7JOtAamXUA@mail.gmail.com>

On Tue, Sep 20, 2011 at 8:04 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> "PowerCordRemoved" is not relevant here, as that would kill the entire
> process, which renders the issue of broken shared data within a
> continuing process rather moot.
>

Assuming that the "broken shared data" exists only in RAM on one
single machine, and has no impact on the state of anything on the hard
disk or on any other computer, yes.

ChrisA


From chunuan723 at gmail.com  Mon Sep 19 20:37:31 2011
From: chunuan723 at gmail.com (he sharon)
Date: Mon, 19 Sep 2011 17:37:31 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <7345edb4-a967-4c69-a212-d5072809e360@19g2000vbx.googlegroups.com>

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From greg.ewing at canterbury.ac.nz  Mon Sep 19 20:51:42 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 20 Sep 2011 12:51:42 +1200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <mailman.1279.1316426806.27778.python-list@python.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<mailman.1279.1316426806.27778.python-list@python.org>
Message-ID: <9dq6cvF4ndU1@mid.individual.net>

Antoon Pardon wrote:

> int PyThreadState_SetAsyncExc(long id, PyObject *exc)
> 
> To prevent
> naive misuse, you must write your own C extension to call this.

Not if we use ctypes! Muahahahaaa!

-- 
Greg


From steve+comp.lang.python at pearwood.info  Mon Sep 19 21:22:41 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 20 Sep 2011 11:22:41 +1000
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
Message-ID: <4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>

Westley Mart?nez wrote:

> def __radd__(self, other):
>     return self.__add__(self, other)

Which, inside a class, can be simplified to:

    __radd__ = __add__



-- 
Steven



From roy at panix.com  Mon Sep 19 22:26:30 2011
From: roy at panix.com (Roy Smith)
Date: Mon, 19 Sep 2011 22:26:30 -0400
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
	<4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-E8DAD5.22263019092011@news.panix.com>

In article <4e77eae1$0$29978$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> Westley Mart??nez wrote:
> 
> > def __radd__(self, other):
> >     return self.__add__(self, other)
> 
> Which, inside a class, can be simplified to:
> 
>     __radd__ = __add__

Ooh, I could see that leading to some weird diagnostics.  For example:

class Foo:
    def __add__(self, other):
        raise Exception

    __radd__ = __add__

f1 = Foo()
print 1 + f1

produces:

./add.py
Traceback (most recent call last):
  File "./add.py", line 11, in <module>
    print 1 + f1
  File "./add.py", line 5, in __add__
    raise Exception
Exception

which leaves the user wondering why __add__() was called when clearly 
__radd__() should have been.  The way Westley wrote it (modulo fixing 
the __add__() call signature) produces:

./add.py
Traceback (most recent call last):
  File "./add.py", line 11, in <module>
    print 1 + f1
  File "./add.py", line 8, in __radd__
    return self.__add__(other)
  File "./add.py", line 5, in __add__
    raise Exception
Exception

which at least is a stack trace that shows that __radd__() was called.


From steve+comp.lang.python at pearwood.info  Mon Sep 19 22:43:25 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 20 Sep 2011 02:43:25 GMT
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
	<4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>
	<roy-E8DAD5.22263019092011@news.panix.com>
Message-ID: <4e77fdcd$0$29995$c3e8da3$5496439d@news.astraweb.com>

On Mon, 19 Sep 2011 22:26:30 -0400, Roy Smith wrote:

> In article <4e77eae1$0$29978$c3e8da3$5496439d at news.astraweb.com>,
>  Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> 
>> Westley Mart?nez wrote:
>> 
>> > def __radd__(self, other):
>> >     return self.__add__(self, other)
>> 
>> Which, inside a class, can be simplified to:
>> 
>>     __radd__ = __add__
> 
> Ooh, I could see that leading to some weird diagnostics.

"Weird"?

You've lived a sheltered life if you think a function being known under 
two names is weird. Wait until you discover monkey-patching built-ins for 
fun and profit!



-- 
Steven


From anikom15 at gmail.com  Mon Sep 19 22:53:39 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Mon, 19 Sep 2011 19:53:39 -0700
Subject: Operator commutativity
In-Reply-To: <roy-E8DAD5.22263019092011@news.panix.com>
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
	<4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>
	<roy-E8DAD5.22263019092011@news.panix.com>
Message-ID: <20110920025339.GA22418@Smoke>

On Mon, Sep 19, 2011 at 10:26:30PM -0400, Roy Smith wrote:
> In article <4e77eae1$0$29978$c3e8da3$5496439d at news.astraweb.com>,
>  Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> 
> > Westley Mart??nez wrote:
> > 
> > > def __radd__(self, other):
> > >     return self.__add__(self, other)
> > 
> > Which, inside a class, can be simplified to:
> > 
> >     __radd__ = __add__
> 
> Ooh, I could see that leading to some weird diagnostics.  For example:
> 
> class Foo:
>     def __add__(self, other):
>         raise Exception
> 
>     __radd__ = __add__
> 
> f1 = Foo()
> print 1 + f1
> 
> produces:
> 
> ./add.py
> Traceback (most recent call last):
>   File "./add.py", line 11, in <module>
>     print 1 + f1
>   File "./add.py", line 5, in __add__
>     raise Exception
> Exception
> 
> which leaves the user wondering why __add__() was called when clearly 
> __radd__() should have been.  The way Westley wrote it (modulo fixing 
> the __add__() call signature) produces:
> 
> ./add.py
> Traceback (most recent call last):
>   File "./add.py", line 11, in <module>
>     print 1 + f1
>   File "./add.py", line 8, in __radd__
>     return self.__add__(other)
>   File "./add.py", line 5, in __add__
>     raise Exception
> Exception
> 
> which at least is a stack trace that shows that __radd__() was called.

Calling __radd__ = __add__ simply creates a reference to __add__ named
__radd__, it doesn't create a new method.


From stars9820 at gmail.com  Tue Sep 20 01:34:59 2011
From: stars9820 at gmail.com (star ship)
Date: Mon, 19 Sep 2011 22:34:59 -0700 (PDT)
Subject: DATA ENTRY JOB
Message-ID: <e11f5118-6705-4df8-8dce-ab2f219431d0@u20g2000yqj.googlegroups.com>

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Date: Tue, 20 Sep 2011 00:55:20 -0700 (PDT)
Subject: red bull hats of http:www.discounthats.net
Message-ID: <1dcd1d21-b168-4f73-8411-50903d6fd665@19g2000vbx.googlegroups.com>

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From: zzzzysilence at gmail.com (Bertha Jonanna)
Date: Tue, 20 Sep 2011 01:07:44 -0700 (PDT)
Subject: red bull hats of http:www.discounthats.net
Message-ID: <fbcca148-4963-4882-a6d2-1898ce809633@s20g2000yqh.googlegroups.com>

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From mateusz at loskot.net  Tue Sep 20 06:34:42 2011
From: mateusz at loskot.net (Mateusz Loskot)
Date: Tue, 20 Sep 2011 11:34:42 +0100
Subject: PyEval_EvalCodeEx return value
Message-ID: <4E786C42.3050309@loskot.net>

Hi,

I'm trying to dig out details about what exactly is the return
value the of PyEval_EvalCodeEx function in Python 3.x
The documentation is sparse, unfortunately.

Perhaps I'm looking at wrong function.
My aim is simple, I need to execute Python code using Python interpreter 
embedded in my C++ application.
The Python code is a simple script that always returns single value.
For example:

#! /usr/bin/env python
def foo(a, b):
    return a + b
f = foo(2, 3)

But, f can be of different type for different script: one returns 
numeric value, another returns a sequence, so the type is not
possible to be determined in advance.

I know how to capture Python stdout/stderr.

I also know how to access the "f" attribute using
PyObject_GetAttrString and then I can convert "f" value to C++ type
depending on PyObject type.

However, I guess there shall be a way to access "f" value
directly from PyEval_EvalCode return object:

PyObject* evalRet = ::PyEval_EvalCode(...);

But, I can't find any details what the "evalRet" actually is.

Any pointers would be helpful.

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org
Member of ACCU, http://accu.org


From alec.taylor6 at gmail.com  Tue Sep 20 08:32:53 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Tue, 20 Sep 2011 22:32:53 +1000
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <4E77A8A0.3030104@gmail.com>
References: <j52nab$bfc$1@dont-email.me>
	<CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
	<4E77A8A0.3030104@gmail.com>
Message-ID: <CAO+9iGf1=jsG5=+cP0DL5z5GrNAMuDEtxc4yi0AGOeD9FrmVzA@mail.gmail.com>

I can confirm that os.mkdir('C:\\h') and os.path.exists('C:\\h') work
on Windows 8 Dev x64.

On Tue, Sep 20, 2011 at 6:40 AM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> On 2011.09.19 09:00 AM, Brian Curtin wrote:
>> You said "the application does not create an app folder in the user's
>> 'application data' directory" -- what does this mean, or rather, what
>> is the specific folder you're expecting to have? If Python can't
>> create the directory but you can do it manually, there may be some
>> permission or access differences new to Windows 8. What does "echo
>> %APPDATA%" give you?
> I booted up the Win8 dev preview in a VM and os.environ['appdata'] gives
> me the same result it would for Windows 7. Perhaps the problem lies in
> the os.path.exists() call (that is, Win8 and Win7 react differently to
> this call). I personally would try to create the directory and then
> catch either a WindowsError (error 183) or an OSError (error 17) if the
> directory already exists. I might play around with this later and post
> some results.
>
> --
> CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2
> PGP/GPG Public Key ID: 0xF88E034060A78FCB
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From kw at codebykevin.com  Tue Sep 20 08:40:30 2011
From: kw at codebykevin.com (Kevin Walzer)
Date: Tue, 20 Sep 2011 08:40:30 -0400
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <mailman.1299.1316521975.27778.python-list@python.org>
References: <j52nab$bfc$1@dont-email.me>
	<CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
	<4E77A8A0.3030104@gmail.com>
	<mailman.1299.1316521975.27778.python-list@python.org>
Message-ID: <j5a1ju$6sk$1@dont-email.me>

On 9/20/11 8:32 AM, Alec Taylor wrote:
> I can confirm that os.mkdir('C:\\h') and os.path.exists('C:\\h') work
> on Windows 8 Dev x64.

OK--looks like I will need to do a bit more digging into my own code. 
Thanks for clarifying.

-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From mohammedimran115 at gmail.com  Tue Sep 20 09:57:08 2011
From: mohammedimran115 at gmail.com (mohammed imran)
Date: Tue, 20 Sep 2011 06:57:08 -0700 (PDT)
Subject: mohammedimran
Message-ID: <6cedda83-32da-4d4d-befa-1b6f89768111@f41g2000yqh.googlegroups.com>

http://123maza.com/65/fun564/


From funthyme at gmail.com  Tue Sep 20 10:40:06 2011
From: funthyme at gmail.com (John Pinner)
Date: Tue, 20 Sep 2011 07:40:06 -0700 (PDT)
Subject: PyEval_EvalCodeEx return value
References: <mailman.1298.1316516670.27778.python-list@python.org>
Message-ID: <3520ac5c-9e75-45b2-a4f1-fc29658bea4b@l4g2000vbv.googlegroups.com>

On Sep 20, 11:34?am, Mateusz Loskot <mate... at loskot.net> wrote:
> Hi,
>
> I'm trying to dig out details about what exactly is the return
> value the of PyEval_EvalCodeEx function in Python 3.x
> The documentation is sparse, unfortunately.
>
> Perhaps I'm looking at wrong function.
> My aim is simple, I need to execute Python code using Python interpreter
> embedded in my C++ application.
> The Python code is a simple script that always returns single value.
> For example:
>
> #! /usr/bin/env python
> def foo(a, b):
> ? ? return a + b
> f = foo(2, 3)
>
> But, f can be of different type for different script: one returns
> numeric value, another returns a sequence, so the type is not
> possible to be determined in advance.
>
> I know how to capture Python stdout/stderr.
>
> I also know how to access the "f" attribute using
> PyObject_GetAttrString and then I can convert "f" value to C++ type
> depending on PyObject type.
>
> However, I guess there shall be a way to access "f" value
> directly from PyEval_EvalCode return object:
>
> PyObject* evalRet = ::PyEval_EvalCode(...);
>
> But, I can't find any details what the "evalRet" actually is.

I assume that you have read the documentation at http://docs.python.org/c-api/veryhigh.html,
and I agree that it's sparse, but the entry for the next entry,
PyEval_EvalCodeEx, tells you a little more, as does that for
PyEval_EvalFrameEx.

Obviously, it's returning a pointer to a PyObject, and Looking at the
source code, that may be NULL, to throw an exception, or an execution
frame, or a generator,etc, etc, depending on the code it's been given.
I guess that you should be able to inspect the PyObject to see what it
is.

What I'm wondering is, why are you eval-ing code ? A favourite device
of C programmers coming to Python (and mea culpa in the past), it's
fraught with potential problems and even security risks, and is
difficult to debug, and maybe you should be using introspection
instead.

And maybe you should be working in Python, and not C++ at this point,
do the dynamic stuff in the language best suited, and then return to C+
+ when needed.

Best wishes,

John
--

> Any pointers would be helpful.
>
> Best regards,
> --
> Mateusz Loskot,http://mateusz.loskot.net
> Charter Member of OSGeo,http://osgeo.org
> Member of ACCU,http://accu.org



From jasfreedom at gmail.com  Tue Sep 20 11:09:21 2011
From: jasfreedom at gmail.com (jasmine jasmine)
Date: Tue, 20 Sep 2011 08:09:21 -0700 (PDT)
Subject: techology
Message-ID: <b2c25c15-31e5-4252-b68e-0d7e99dbf621@fe21g2000vbb.googlegroups.com>

http://123maza.com/48/doll789/


From yasar11732 at gmail.com  Tue Sep 20 12:44:46 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Tue, 20 Sep 2011 19:44:46 +0300
Subject: HTMLParser and non-ascii html pages
Message-ID: <CAFEUn8aEsLsokZPRd-cP=3hQSp-_U=V7U23yRhRVm4LiZqUAaA@mail.gmail.com>

Hi,

I am using a simple sublclass of HTMLParser like this:

class LinkCollector(HTMLParser):

    def reset(self):
        self.links = []
        HTMLParser.reset(self)

    def handle_starttag(self,tag,attr):
        if tag in ("a","link"):
            key = "href"
        elif tag in ("img","script"):
            key = "src"
        else:
            return
        self.links.extend([v for k,v in attr if k == key])

This gives following error:

Traceback (most recent call last):
  File "downloader.py", line 209, in <module>
    if __name__ == "__main__": main()
  File "downloader.py", line 201, in main
    link_collect.feed(response)
  File "C:\Python27\lib\HTMLParser.py", line 108, in feed
    self.goahead(0)
  File "C:\Python27\lib\HTMLParser.py", line 148, in goahead
    k = self.parse_starttag(i)
  File "C:\Python27\lib\HTMLParser.py", line 252, in parse_starttag
    attrvalue = self.unescape(attrvalue)
  File "C:\Python27\lib\HTMLParser.py", line 393, in unescape
    return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities,
s)
  File "C:\Python27\lib\re.py", line 151, in sub
    return _compile(pattern, flags).sub(repl, string, count)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 13:
ordinal not in range(128)

Rest of the code available as attachment. Does anyone know how to solve
this?

-- 
http://yasar.serveblog.net/
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From ppearson at nowhere.invalid  Tue Sep 20 13:07:35 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 20 Sep 2011 17:07:35 GMT
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<mailman.1283.1316436548.27778.python-list@python.org>
Message-ID: <9drvinFngaU1@mid.individual.net>

On Mon, 19 Sep 2011 05:48:07 -0700, Ethan Furman <ethan at stoneleaf.us> wrote:
[snip]
> Also, if the right-hand operand is a subclass of the left-hand operand 
> then Python will try right-hand_operand.__radd__ first.

I don't think it works that way for me:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
>>> class C1():
...     def __add__(self, other):
...         print "C1.__add__()"
... 
>>> class C2(C1):
...     def __radd__(self, other):
...         print "C2.__radd__()"
... 
>>> C1() + C2()
C1.__add__()
>>> 


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


From dreyemi at gmail.com  Tue Sep 20 14:13:32 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 19:13:32 +0100
Subject: Why are my queues empty even though there are items in it?
Message-ID: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>

Hello friends,

I'm writing some Python app that makes use of the multiprocessing and Queue
api to perform
transaction jobs.

My problem is that, the queue always report empty even though I can confirm
that there are items in it.

Below is the code I'm working with:

import multiprocessing
from multiprocessing import Process, Queue
from Queue import Empty

def process(**kwargs):
    q = kwargs['q']
    # Don't start the process if there's no item in queue
    if q.empty():
        print 'empty queue'
        multiprocessing.Process() # Process defaults to None
    else:
        p = multiprocessing.Process(target=transaction_queue, args=(kwargs))
        p.start()

def put_in_queue(items={}):
    print items

    q = multiprocessing.Queue()

    try:
        for k,v in items.iteritems():
            data = v #data is a dict
            timeout = data.get(u'timeout')

            # Put the transaction item in the queue at a specific timeout
            # period
            q.put(data, False, timeout)
            print "{0} put to queue".format(data)
            transaction_queue(q, data, timeout, False)

    except (KeyError, AttributeError, ValueError):
        print 'Incorrect data format'

def transaction_queue(queue, item, timeout, block=False):
    queue = multiprocessing.Queue()
    if item is not {} and timeout is not 0:
        print "Items are {0}".format(item)
        for i in range(len(item)):
            try:
                d = queue.get(block)
                print d
            except Empty:
                print 'Fees queue empty at %s' % (i)
            else:
                return process(q=queue, i=d, t=timeout)
    else:
        print 'No item in the queue to get'

A JSON POST from CURL calls put_in_queue callback:

 curl -v -H "Content-Type: application/json" -X POST --data
'fees={"fees":{"status":"pending","timeout":5},
"hostel":{"status":"pending","timeout": 3}}'
http://127.0.0.1:8000/transaction/add/ > post_data.txt

At code run, the output is:

{u'status': u'pending', u'timeout': 3} put to queue
Items are {u'status': u'pending', u'timeout': 3}
Fees queue empty at 0
Fees queue empty at 1
{u'status': u'pending', u'timeout': 5} put to queue
Items are {u'status': u'pending', u'timeout': 5}
Fees queue empty at 0
Fees queue empty at 1

Q: Why are my queues empty even though there are items in it?

Thanks you for the suggestions and answers.

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From dreyemi at gmail.com  Tue Sep 20 14:29:06 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 19:29:06 +0100
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAPbrmCtirM3gCWgXm752f6pYAG_8qxV0z-nSetXkxGFGmp5p0A@mail.gmail.com>

On Tue, Sep 20, 2011 at 12:13 AM, Jordan Evans <mindwalkernine at gmail.com>wrote:

> I want dynamically place the 'return' statement in a function via user
> input or achieve the same through some other means.  If some other means,
> the user must be able initiate this at runtime during a raw_input().  This
> is what I have so far, this would be an awesome command line debugging tool
> if I can get it to work.
>
> def b(label="", *args):
>     """Used to create breaks for debugging.  Will break the function or
> continue the function it is place within based on user input.  Has as a
> input loop for querying variables and executing code before a break or a
> continue."""
>     print label+":",
>     for arg in args:
>         print str(arg),
>     if len(args):
>         print
>     x = ""
>     while x != ".":
>         command = raw_input()
>         try:
>             exec command
>         except:
>             pass
>

Isn't this "call by reference" ?

see
http://docs.python.org/faq/programming.html?highlight=kwargs#how-do-i-write-a-function-with-output-parameters-call-by-reference



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From rosuav at gmail.com  Tue Sep 20 14:35:24 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 21 Sep 2011 04:35:24 +1000
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAPTjJmp5Xy9SrhVCGe2CESxOkmuWYCSufRkV06GjySA=2FXnZQ@mail.gmail.com>

On Tue, Sep 20, 2011 at 9:13 AM, Jordan Evans <mindwalkernine at gmail.com> wrote:
> I want dynamically place the 'return' statement in a function via user input
> or achieve the same through some other means.? If some other means, the user
> must be able initiate this at runtime during a raw_input().? This is what I
> have so far, this would be an awesome command line debugging tool if I can
> get it to work.

Not entirely sure what you're trying to accomplish here. You want to
pepper your code with calls to b() and then have the user be able to
abort the function from there? If so, I can think of two ways:

1) Have b() raise an exception, which you catch at a high level.
That'd unwind the stack all the way to the top, which may or may not
be what you want. Pretty easy to do though.
2) Pepper your code with:
if b(): return
and then have b return 0 normally and 1 when the user asks to abort.

This isn't truly an interactive debugger, though it does potentially
have much value.

ChrisA


From dreyemi at gmail.com  Tue Sep 20 14:35:47 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 19:35:47 +0100
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAPbrmCtqjJpjSJTOt90Uow=7RGPKwn3A4qXAS-YxUhHPac-U0A@mail.gmail.com>

On Tue, Sep 20, 2011 at 12:13 AM, Jordan Evans <mindwalkernine at gmail.com>wrote:

> I want dynamically place the 'return' statement in a function via user
> input or achieve the same through some other means.  If some other means,
> the user must be able initiate this at runtime during a raw_input().  This
> is what I have so far, this would be an awesome command line debugging tool
> if I can get it to work.
>
> def b(label="", *args):
>     """Used to create breaks for debugging.  Will break the function or
> continue the function it is place within based on user input.  Has as a
> input loop for querying variables and executing code before a break or a
> continue."""
>     print label+":",
>     for arg in args:
>         print str(arg),
>     if len(args):
>         print
>     x = ""
>     while x != ".":
>         command = raw_input()
>         try:
>             exec command
>         except:
>             pass
>

It is also possible to create the function in your loop.

for arg in args:
   def f(args):
       return args # You can make this a callback function if you want


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From python at mrabarnett.plus.com  Tue Sep 20 14:42:38 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 20 Sep 2011 19:42:38 +0100
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
Message-ID: <4E78DE9E.3050100@mrabarnett.plus.com>

On 20/09/2011 19:13, Kayode Odeyemi wrote:
> Hello friends,
>
> I'm writing some Python app that makes use of the multiprocessing and
> Queue api to perform
> transaction jobs.
>
> My problem is that, the queue always report empty even though I can
> confirm that there are items in it.
>
> Below is the code I'm working with:
>
[snip]
>
> def transaction_queue(queue, item, timeout, block=False):
>      queue = multiprocessing.Queue()

This line creates a new empty queue, hiding the one which was passed in.

>      if item is not {} and timeout is not 0:

`not {}` has the value True, so `item is not {}` means `item is True`.
The `is` checks for identity, not equality, so this is true only if `item`
actually has the value True or 1 (and this is an implementation-dependent
behaviour).

>          print "Items are {0}".format(item)
>          for i in range(len(item)):

You're trying to get as many items from the queue as there are items in
the dict `item`, which looks wrong to me.

>              try:
>                  d = queue.get(block)
>                  print d
>              except Empty:
>                  print 'Fees queue empty at %s' % (i)
>              else:
>                  return process(q=queue, i=d, t=timeout)
>      else:
>          print 'No item in the queue to get'
>
> A JSON POST from CURL calls put_in_queue callback:
>
>   curl -v -H "Content-Type: application/json" -X POST --data
> 'fees={"fees":{"status":"pending","timeout":5},
> "hostel":{"status":"pending","timeout": 3}}'
> http://127.0.0.1:8000/transaction/add/ > post_data.txt
>
> At code run, the output is:
>
> {u'status': u'pending', u'timeout': 3} put to queue
> Items are {u'status': u'pending', u'timeout': 3}
> Fees queue empty at 0
> Fees queue empty at 1
> {u'status': u'pending', u'timeout': 5} put to queue
> Items are {u'status': u'pending', u'timeout': 5}
> Fees queue empty at 0
> Fees queue empty at 1
>
> Q: Why are my queues empty even though there are items in it?
>
What makes you think there are items in it? You print out `item`, which
is not the queue.

> Thanks you for the suggestions and answers.
>


From arnodel at gmail.com  Tue Sep 20 15:04:29 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 20 Sep 2011 20:04:29 +0100
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAJ6cK1ZJedLiKU+6ni8vLhR50QsAmkXmE99jC=hU=0hWa7_UQw@mail.gmail.com>

On 20 September 2011 00:13, Jordan Evans <mindwalkernine at gmail.com> wrote:
> I want dynamically place the 'return' statement in a function via user input
> or achieve the same through some other means.? If some other means, the user
> must be able initiate this at runtime during a raw_input().? This is what I
> have so far, this would be an awesome command line debugging tool if I can
> get it to work.
>
> def b(label="", *args):
> ??? """Used to create breaks for debugging.? Will break the function or
> continue the function it is place within based on user input.? Has as a
> input loop for querying variables and executing code before a break or a
> continue."""
> ??? print label+":",
> ??? for arg in args:
> ??? ??? print str(arg),
> ??? if len(args):
> ??? ??? print
> ??? x = ""
> ??? while x != ".":
> ??? ??? command = raw_input()
> ??? ??? try:
> ??? ??? ??? exec command
> ??? ??? except:
> ??? ??? ??? pass
>

I don't really understand your dynamic return idea, but this reminds
me of some debugging function I wrote some time ago.  It pauses
execution and you can evaluate expression in the current stack frame
and any of its parents using the following syntax:

    <expr> executes <expr> in the stack frame where pause() was inserted
    .<expr> executes it in the parent of this stack frame
    ..<expr> in the grandparent (etc...)

    ? shows all accessible stack frames

def pause():
    import sys, inspect, re
    f = None
    print "\n*** Entering pause mode (EOF to resume)"
    try:
        while True:
            try:
                c = raw_input('pause> ')
                if c == '?':
                    for i, fi in enumerate(inspect.stack()[1:]):
                        print ('%s File "%s", line %s, in %s' %
                               ('.'*i, fi[1], fi[2], fi[3]))
                    continue
                dots = re.match(r'\.*', c)
                back = 0
                if dots:
                    back = len(dots.group())
                f = sys._getframe(back+1)
                code_name = f.f_code.co_name
                cmd = c[back:]
                val = cmd and eval(cmd, f.f_globals, f.f_locals)
                print "(%s) %r" % (code_name, val)
            except Exception, e:
                if isinstance(e, EOFError):
                    del f
                    raise
                print "%s: %s" % (type(e).__name__, e)
    except EOFError:
        pass
    finally:
        print "\n*** Leaving pause mode"


# Simple example of 'pause' in action:

>>> def g(x):
...     b = 5
...     pause()
...
>>> def f(x, y):
...     z = 2
...     g(x)
...     print "And we carry on..."
...
>>> f('spam', [4, 2])

*** Entering pause mode (EOF to resume)
pause> ?
 File "<stdin>", line 3, in g
. File "<stdin>", line 3, in f
.. File "<stdin>", line 1, in <module>
pause> b
(g) 5
pause> b+1
(g) 6
pause> .z
(f) 2
pause> .y
(f) [4, 2]
pause> .x
(f) 'spam'
pause> ..len
(<module>) <built-in function len>
pause> ^D
*** Leaving pause mode
And we carry on...
>>>

-- 
Arnaud


From schesis at gmail.com  Tue Sep 20 15:09:12 2011
From: schesis at gmail.com (Zero Piraeus)
Date: Tue, 20 Sep 2011 15:09:12 -0400
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <4E78DE9E.3050100@mrabarnett.plus.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
	<4E78DE9E.3050100@mrabarnett.plus.com>
Message-ID: <CANaSqUeYzx0u3yW1gKZRmuanV+JMHkMrvu4aq9RbZ+k2mwrLww@mail.gmail.com>

:

On 20 September 2011 14:42, MRAB <python at mrabarnett.plus.com> wrote:
> On 20/09/2011 19:13, Kayode Odeyemi wrote:
>>
>> ? ? if item is not {} and timeout is not 0:
>
> `not {}` has the value True, so `item is not {}` means `item is True`.
> The `is` checks for identity, not equality, so this is true only if `item`
> actually has the value True or 1 (and this is an implementation-dependent
> behaviour).

Nitpick: "is not" is an operator:

>>> "foo" is not {}
True
>>> "foo" is (not {})
False

 -[]z.


From ethan at stoneleaf.us  Tue Sep 20 15:09:15 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Tue, 20 Sep 2011 12:09:15 -0700
Subject: Operator commutativity
In-Reply-To: <9drvinFngaU1@mid.individual.net>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
Message-ID: <4E78E4DB.4040606@stoneleaf.us>

Peter Pearson wrote:
> On Mon, 19 Sep 2011 05:48:07 -0700, Ethan Furman <ethan at stoneleaf.us> wrote:
> [snip]
>> Also, if the right-hand operand is a subclass of the left-hand operand 
>> then Python will try right-hand_operand.__radd__ first.
> 
> I don't think it works that way for me:
> 
> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
>>>> class C1():
> ...     def __add__(self, other):
> ...         print "C1.__add__()"
> ... 
>>>> class C2(C1):
> ...     def __radd__(self, other):
> ...         print "C2.__radd__()"
> ... 
>>>> C1() + C2()
> C1.__add__()

Oh, it has to be a new-style class.  Sorry.

~Ethan~



From python at mrabarnett.plus.com  Tue Sep 20 15:43:18 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 20 Sep 2011 20:43:18 +0100
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <CANaSqUeYzx0u3yW1gKZRmuanV+JMHkMrvu4aq9RbZ+k2mwrLww@mail.gmail.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
	<4E78DE9E.3050100@mrabarnett.plus.com>
	<CANaSqUeYzx0u3yW1gKZRmuanV+JMHkMrvu4aq9RbZ+k2mwrLww@mail.gmail.com>
Message-ID: <4E78ECD6.3010705@mrabarnett.plus.com>

On 20/09/2011 20:09, Zero Piraeus wrote:
> :
>
> On 20 September 2011 14:42, MRAB<python at mrabarnett.plus.com>  wrote:
>> On 20/09/2011 19:13, Kayode Odeyemi wrote:
>>>
>>>      if item is not {} and timeout is not 0:
>>
>> `not {}` has the value True, so `item is not {}` means `item is True`.
>> The `is` checks for identity, not equality, so this is true only if `item`
>> actually has the value True or 1 (and this is an implementation-dependent
>> behaviour).
>
> Nitpick: "is not" is an operator:
>
>>>> "foo" is not {}
> True
>>>> "foo" is (not {})
> False
>
Oops! True.

However, it still doesn't do what the OP intended:

 >>> {} is {}
False
 >>> {} is not {}
True


From dreyemi at gmail.com  Tue Sep 20 15:51:23 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 20:51:23 +0100
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <4E78DE9E.3050100@mrabarnett.plus.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
	<4E78DE9E.3050100@mrabarnett.plus.com>
Message-ID: <CAPbrmCshy_=exQe1jvcFRjY5NRWwxNRPZHqJEZRFXjb-+Q9YNw@mail.gmail.com>

On Tue, Sep 20, 2011 at 7:42 PM, MRAB <python at mrabarnett.plus.com> wrote:

> On 20/09/2011 19:13, Kayode Odeyemi wrote:
>
> def transaction_queue(queue, item, timeout, block=False):
>>     queue = multiprocessing.Queue()
>>
>
> This line creates a new empty queue, hiding the one which was passed in.


Removed.

>
>
>      if item is not {} and timeout is not 0:
>>
>
> `not {}` has the value True, so `item is not {}` means `item is True`.
> The `is` checks for identity, not equality, so this is true only if `item`
> actually has the value True or 1 (and this is an implementation-dependent
> behaviour).


changed to:

if item != {} and timeout != None

>
>
>          print "Items are {0}".format(item)
>>         for i in range(len(item)):
>>
>
> You're trying to get as many items from the queue as there are items in
> the dict `item`, which looks wrong to me.
>
>
>              try:
>>                 d = queue.get(block)
>>                 print d
>>             except Empty:
>>                 print 'Fees queue empty at %s' % (i)
>>             else:
>>                 return process(q=queue, i=d, t=timeout)
>>     else:
>>         print 'No item in the queue to get'
>>
>> Effected this. d has a result in the output (output below). So obviously,
it is not empty.

What I'm trying to do in the initial code is to have all items in the queue
evaluated at the
same time such that each leaves the queue for processing when its timeout
period has elapse.

>
>> Q: Why are my queues empty even though there are items in it?
>>
>>  What makes you think there are items in it? You print out `item`, which
> is not the queue.
>

I've made these changes but the queue still appears empty

None put to queue
{u'status': u'pending', u'timeout': 3}
empty queue
None put to queue
{u'status': u'pending', u'timeout': 5}
empty queue

Why 'empty queue' in process()? Also, why "None put to queue" since d
confirms
the items in the queue?


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From arnodel at gmail.com  Tue Sep 20 15:59:14 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 20 Sep 2011 20:59:14 +0100
Subject: About MAKE_FUNCTION opcode in Python 3
Message-ID: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>

Since Python 3.0 we have keyword only arguments in functions (see PEP
3102).  Looking at the documentation for the dis module (where opcodes
are documented), I see the following for MAKE_FUNCTION [1]

"""
MAKE_FUNCTION(argc)
Pushes a new function object on the stack. TOS is the code associated
with the function. The function object is defined to have argc default
parameters, which are found below TOS.
"""

No mention of default values for keyword only arguments.  Now let's
try (Python 3.2):

>>> def foo():
...   def bar(x, y, *args, z=1, t=2, **kwargs): pass
...
>>> dis.dis(foo)
  2           0 LOAD_CONST               1 ('z')
              3 LOAD_CONST               2 (1)
              6 LOAD_CONST               3 ('t')
              9 LOAD_CONST               4 (2)
             12 LOAD_CONST               5 (<code object bar at
0x1005ec8b0, file "<stdin>", line 2>)
             15 MAKE_FUNCTION          512
             18 STORE_FAST               0 (bar)
             21 LOAD_CONST               0 (None)
             24 RETURN_VALUE

MAKE_FUNCTION has an argc of 512.  So it seems that since Python 3.0:

* the number of default values for normal arguments is argc & 0xFF
* the number of default values for keyword only arguments is argc >> 8

Can anyone confirm this?  I can then open a ticket on bugs.python.org

[1] http://docs.python.org/dev/library/dis.html#opcode-MAKE_FUNCTION

-- 
Arnaud


From __peter__ at web.de  Tue Sep 20 16:11:58 2011
From: __peter__ at web.de (Peter Otten)
Date: Tue, 20 Sep 2011 22:11:58 +0200
Subject: HTMLParser and non-ascii html pages
References: <CAFEUn8aEsLsokZPRd-cP=3hQSp-_U=V7U23yRhRVm4LiZqUAaA@mail.gmail.com>
Message-ID: <j5as1b$itn$1@dough.gmane.org>

Ya?ar Arabac? wrote:

> I am using a simple sublclass of HTMLParser like this:
> 
> class LinkCollector(HTMLParser):
> 
>     def reset(self):
>         self.links = []
>         HTMLParser.reset(self)
> 
>     def handle_starttag(self,tag,attr):
>         if tag in ("a","link"):
>             key = "href"
>         elif tag in ("img","script"):
>             key = "src"
>         else:
>             return
>         self.links.extend([v for k,v in attr if k == key])
> 
> This gives following error:
> 
> Traceback (most recent call last):
>   File "downloader.py", line 209, in <module>
>     if __name__ == "__main__": main()
>   File "downloader.py", line 201, in main
>     link_collect.feed(response)
>   File "C:\Python27\lib\HTMLParser.py", line 108, in feed
>     self.goahead(0)
>   File "C:\Python27\lib\HTMLParser.py", line 148, in goahead
>     k = self.parse_starttag(i)
>   File "C:\Python27\lib\HTMLParser.py", line 252, in parse_starttag
>     attrvalue = self.unescape(attrvalue)
>   File "C:\Python27\lib\HTMLParser.py", line 393, in unescape
>     return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities,
> s)
>   File "C:\Python27\lib\re.py", line 151, in sub
>     return _compile(pattern, flags).sub(repl, string, count)
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 13:
> ordinal not in range(128)

Trying to reproduce the error:

>>> from HTMLParser import HTMLParser
>>> class P(HTMLParser):
...     def handle_starttag(self, tag, attrs):
...             key, value = attrs[0]
...             print tag, key, "=", value
...
>>> def feed(s):
...     P().feed(s)
...
>>> feed("<a href='yadda'/>")
a href = yadda
>>> feed("<a href='&auml; yadda'/>")
a href = ? yadda
>>> feed("<a href='&auml; ?'/>")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in feed
  File "/usr/local/lib/python2.7/HTMLParser.py", line 108, in feed
    self.goahead(0)
  File "/usr/local/lib/python2.7/HTMLParser.py", line 148, in goahead
    k = self.parse_starttag(i)
  File "/usr/local/lib/python2.7/HTMLParser.py", line 252, in parse_starttag
    attrvalue = self.unescape(attrvalue)
  File "/usr/local/lib/python2.7/HTMLParser.py", line 390, in unescape
    return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities, 
s)
  File "/usr/local/lib/python2.7/re.py", line 151, in sub
    return _compile(pattern, flags).sub(repl, string, count)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: 
ordinal not in range(128)

It seems that the exception is triggered by an attribute value that contains 
both entities and non-ascii bytes.

>>> feed(u"<a href='&auml; ?'/>")
a href = ? ?

> Rest of the code available as attachment. Does anyone know how to solve
> this?

The documentation doesn't mention unicode, but it seems to work anyway:

>>> feed(u"<a href='&auml; ?'/>")
a href = ? ?

So one fix might be to convert the data to unicode before passing it to the 
HTMLParser. 



From ericsnowcurrently at gmail.com  Tue Sep 20 17:56:41 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Tue, 20 Sep 2011 15:56:41 -0600
Subject: About MAKE_FUNCTION opcode in Python 3
In-Reply-To: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
References: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
Message-ID: <CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>

On Tue, Sep 20, 2011 at 1:59 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> Since Python 3.0 we have keyword only arguments in functions (see PEP
> 3102). ?Looking at the documentation for the dis module (where opcodes
> are documented), I see the following for MAKE_FUNCTION [1]
>
> """
> MAKE_FUNCTION(argc)
> Pushes a new function object on the stack. TOS is the code associated
> with the function. The function object is defined to have argc default
> parameters, which are found below TOS.
> """
>
> No mention of default values for keyword only arguments. ?Now let's
> try (Python 3.2):
>
>>>> def foo():
> ... ? def bar(x, y, *args, z=1, t=2, **kwargs): pass
> ...
>>>> dis.dis(foo)
> ?2 ? ? ? ? ? 0 LOAD_CONST ? ? ? ? ? ? ? 1 ('z')
> ? ? ? ? ? ? ?3 LOAD_CONST ? ? ? ? ? ? ? 2 (1)
> ? ? ? ? ? ? ?6 LOAD_CONST ? ? ? ? ? ? ? 3 ('t')
> ? ? ? ? ? ? ?9 LOAD_CONST ? ? ? ? ? ? ? 4 (2)
> ? ? ? ? ? ? 12 LOAD_CONST ? ? ? ? ? ? ? 5 (<code object bar at
> 0x1005ec8b0, file "<stdin>", line 2>)
> ? ? ? ? ? ? 15 MAKE_FUNCTION ? ? ? ? ?512
> ? ? ? ? ? ? 18 STORE_FAST ? ? ? ? ? ? ? 0 (bar)
> ? ? ? ? ? ? 21 LOAD_CONST ? ? ? ? ? ? ? 0 (None)
> ? ? ? ? ? ? 24 RETURN_VALUE
>
> MAKE_FUNCTION has an argc of 512. ?So it seems that since Python 3.0:
>
> * the number of default values for normal arguments is argc & 0xFF
> * the number of default values for keyword only arguments is argc >> 8
>
> Can anyone confirm this? ?I can then open a ticket on bugs.python.org

You're mostly right.

http://hg.python.org/cpython/file/default/Python/ceval.c#l2684

  2684             int posdefaults = oparg & 0xff;
  2685             int kwdefaults = (oparg>>8) & 0xff;
  2686             int num_annotations = (oparg >> 16) & 0x7fff;

-eric

>
> [1] http://docs.python.org/dev/library/dis.html#opcode-MAKE_FUNCTION
>
> --
> Arnaud
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve+comp.lang.python at pearwood.info  Tue Sep 20 21:07:15 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 21 Sep 2011 11:07:15 +1000
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
	<mailman.1311.1316545829.27778.python-list@python.org>
Message-ID: <4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>

Ethan Furman wrote:

> Peter Pearson wrote:
>> On Mon, 19 Sep 2011 05:48:07 -0700, Ethan Furman <ethan at stoneleaf.us>
>> wrote:
>> [snip]
>>> Also, if the right-hand operand is a subclass of the left-hand operand
>>> then Python will try right-hand_operand.__radd__ first.
>> 
>> I don't think it works that way for me:
>> 
>> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
>>>>> class C1():
>> ...     def __add__(self, other):
>> ...         print "C1.__add__()"
>> ...
>>>>> class C2(C1):
>> ...     def __radd__(self, other):
>> ...         print "C2.__radd__()"
>> ...
>>>>> C1() + C2()
>> C1.__add__()
> 
> Oh, it has to be a new-style class.  Sorry.

Even so, I still don't think it quite works the way you have suggested.



class C1(object):
    def __add__(self, other):
        return "__add__(%s, %s)" % (self, other)
    def __radd__(self, other):
        return "__radd__(%s, %s)" % (self, other)

class C2(C1):
    pass


>>> C1() + C2()
'__add__(<__main__.C1 object at 0xb7f79b0c>, <__main__.C2 object at
0xb7f79b6c>)'


I've tried that in both Python 2.6 and 3.2 and get the same result.

However, consider this slight variation:

class D1(object):
    def __add__(self, other):
        return "__add__(%s, %s)" % (self, other)

class D2(D1):
    def __radd__(self, other):
        return "__radd__(%s, %s)" % (self, other)


>>> D1() + D2()
'__radd__(<__main__.D2 object at 0xb7c2c36c>, <__main__.D1 object at
0xb7c2cb0c>)'



After playing around with various combinations of C1, C2, D1 and D2, it
seems to me that the rule is:

If the right-hand argument is a subclass of the left-hand argument, AND also
defines __radd__ directly rather than inheriting it, then its __radd__
method is called before the left-hand argument's __add__ method.


which strikes me as a strangely specific and not very useful rule. I suspect
it might be an accident of implementation rather than a deliberate feature.



-- 
Steven



From rosuav at gmail.com  Tue Sep 20 21:31:57 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 21 Sep 2011 11:31:57 +1000
Subject: Operator commutativity
In-Reply-To: <4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
	<mailman.1311.1316545829.27778.python-list@python.org>
	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmrOeVDT7wXgZJ8Xh2H6H6hP_i20CM7M_7pe+KiAGQPMow@mail.gmail.com>

On Wed, Sep 21, 2011 at 11:07 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> If the right-hand argument is a subclass of the left-hand argument, AND also
> defines __radd__ directly rather than inheriting it, then its __radd__
> method is called before the left-hand argument's __add__ method.
>
> which strikes me as a strangely specific and not very useful rule. I suspect
> it might be an accident of implementation rather than a deliberate feature.

It makes sense, but in a weird way. (Maybe I understand it because I'm
half Dutch? heh) It means that a subclass can override addition for
itself - presumably, it'll define __add__ and __radd__ both - and that
the only time you'd get a false positive (where a function thinks it
can handle the addition but actually there's a better one) is when
it's a subclass. So this is probably correct behaviour, but it's a
fairly weird and esoteric rule.

ChrisA


From tjreedy at udel.edu  Tue Sep 20 23:09:30 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 20 Sep 2011 23:09:30 -0400
Subject: About MAKE_FUNCTION opcode in Python 3
In-Reply-To: <CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>
References: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
	<CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>
Message-ID: <j5bkhc$9ld$1@dough.gmane.org>

On 9/20/2011 5:56 PM, Eric Snow wrote:
> On Tue, Sep 20, 2011 at 1:59 PM, Arnaud Delobelle<arnodel at gmail.com>  wrote:
>> Since Python 3.0 we have keyword only arguments in functions (see PEP
>> 3102).  Looking at the documentation for the dis module (where opcodes
>> are documented), I see the following for MAKE_FUNCTION [1]
>>
>> """
>> MAKE_FUNCTION(argc)
>> Pushes a new function object on the stack. TOS is the code associated
>> with the function. The function object is defined to have argc default
>> parameters, which are found below TOS.
>> """
>>
>> No mention of default values for keyword only arguments.  Now let's
>> try (Python 3.2):
>>
>>>>> def foo():
>> ...   def bar(x, y, *args, z=1, t=2, **kwargs): pass
>> ...
>>>>> dis.dis(foo)
>>   2           0 LOAD_CONST               1 ('z')
>>               3 LOAD_CONST               2 (1)
>>               6 LOAD_CONST               3 ('t')
>>               9 LOAD_CONST               4 (2)
>>              12 LOAD_CONST               5 (<code object bar at
>> 0x1005ec8b0, file "<stdin>", line 2>)
>>              15 MAKE_FUNCTION          512
>>              18 STORE_FAST               0 (bar)
>>              21 LOAD_CONST               0 (None)
>>              24 RETURN_VALUE
>>
>> MAKE_FUNCTION has an argc of 512.  So it seems that since Python 3.0:
>>
>> * the number of default values for normal arguments is argc&  0xFF
>> * the number of default values for keyword only arguments is argc>>  8
>>
>> Can anyone confirm this?  I can then open a ticket on bugs.python.org
>
> You're mostly right.
>
> http://hg.python.org/cpython/file/default/Python/ceval.c#l2684
>
>    2684             int posdefaults = oparg&  0xff;
>    2685             int kwdefaults = (oparg>>8)&  0xff;
>    2686             int num_annotations = (oparg>>  16)&  0x7fff;

>> [1] http://docs.python.org/dev/library/dis.html#opcode-MAKE_FUNCTION

I agree that doc should be updated for 3.x. Please suggest a new working 
if you can, as well as copying the source snippet above. Add me 
terry.reedy as nosy.

-- 
Terry Jan Reedy



From martin at v.loewis.de  Wed Sep 21 01:41:50 2011
From: martin at v.loewis.de (Martin v. Loewis)
Date: Wed, 21 Sep 2011 07:41:50 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <mailman.1242.1316295305.27778.python-list@python.org>
References: <mailman.1242.1316295305.27778.python-list@python.org>
Message-ID: <4E79791E.7000903@v.loewis.de>

> Is it just that nobody's implemented it, or is there a good reason for
> avoiding offering this sort of thing?

I've been considering to implement killing threads several times for the
last 15 years (I think about it once every year), and every time
I give up because it's too complex and just not implementable.

To start with, a simple flag in the thread won't do any good. It will
not cancel blocking system calls, so people will complain that the
threads they meant to cancel continue to run forever. Instead, you
have to use some facility to interrupt blocking system calls. You
then have to convince callers of those blocking system calls not to
retry when they see that the first attempt to call it was interrupted.
And so on.

Regards,
Martin


From vraichur at cisco.com  Wed Sep 21 02:42:21 2011
From: vraichur at cisco.com (Vinay)
Date: Wed, 21 Sep 2011 12:12:21 +0530
Subject: Tunneling using paramiko to establish tunnel with lab-router
Message-ID: <000001cc7829$9d79f6f0$d86de4d0$@com>

Hello Friends,

 

I am looking to implement tunneling in python and using "Paramiko" for
this..

Sending theTunneling script using Paramiko -Python.

 

It's facing some prob, hangs on running the script..output message it says
".. Missing Handlers". Plz let me know the corrections to be done in this
script to making tunneling successful (I hv hard-coded the jump server IP
address 10.64.116.34 and password - "Cisco123" in the script to test it
once). It's urgent, plz giv me solution ASAP!!

 

Thanks n regards,

Vinay

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From k.sahithi2862 at gmail.com  Wed Sep 21 05:00:38 2011
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Subject: SOUTH INDIAN HOT ACTRESS
Message-ID: <41a22645-676f-4f95-852f-a6986d5efea1@h9g2000yqi.googlegroups.com>

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From Antoon.Pardon at rece.vub.ac.be  Wed Sep 21 05:25:02 2011
From: Antoon.Pardon at rece.vub.ac.be (Antoon Pardon)
Date: Wed, 21 Sep 2011 11:25:02 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular expression)
In-Reply-To: <4E79791E.7000903@v.loewis.de>
References: <mailman.1242.1316295305.27778.python-list@python.org>
	<4E79791E.7000903@v.loewis.de>
Message-ID: <20110921092502.GF3410@trout.vub.ac.be>

On Wed, Sep 21, 2011 at 07:41:50AM +0200, Martin v. Loewis wrote:
> > Is it just that nobody's implemented it, or is there a good reason for
> > avoiding offering this sort of thing?
> 
> I've been considering to implement killing threads several times for the
> last 15 years (I think about it once every year), and every time
> I give up because it's too complex and just not implementable.
> 
> To start with, a simple flag in the thread won't do any good.

I don't agree. Now if you had written that it wouldn't solve all
problem, I could understand that. But I have been in circumstances
where a simple flag in the thread implementation would have been
helpfull.

>                                                               It will
> not cancel blocking system calls, so people will complain that the
> threads they meant to cancel continue to run forever. Instead, you
> have to use some facility to interrupt blocking system calls. You
> then have to convince callers of those blocking system calls not to
> retry when they see that the first attempt to call it was interrupted.
> And so on.

But this is no longer an implementation problem but a use problem. If
someone gets an IOError for writing on a closed pipe and he cathes the
exception and retries the write in a loop, then this a problem of the
author of this loop, not of exceptions.

So if one thread throws an exception to an other thread for instance to
indicate a timeout for the latter and the latter catches that exception
and tries again what it was doing in a loop, that is entirely the
problem of the author of that loop and not of the abilty of one thread
throwing an exception in an other.

Unless of course there may be a lot of such problematic loops within
the internal python code.

-- 
Antoon Pardon


From csf178 at 163.com  Wed Sep 21 05:44:52 2011
From: csf178 at 163.com (=?GBK?B?s8zbv7fH?=)
Date: Wed, 21 Sep 2011 17:44:52 +0800 (CST)
Subject: Where can I find a lexical spec of python?
Message-ID: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>

Hi, everyone, 
I've found there was several tokens used in python's grammar(http://docs.python.org/reference/grammar.html) but I didn't see their definition anywhere.  The tokens listed here: 
NEWLINE
ENDMARKER
NAME
INDENT
DEDENT
NUMBER
STRING


I've got some infomations from the source code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but I'm not sure which feature is only for this specified implementaion.  (I saw tabstop could be modified with comments using "tab-width:", ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
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From t at jollybox.de  Wed Sep 21 07:41:33 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 21 Sep 2011 13:41:33 +0200
Subject: Where can I find a lexical spec of python?
In-Reply-To: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
References: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
Message-ID: <4E79CD6D.2030206@jollybox.de>

On 21/09/11 11:44, ??? wrote:
> Hi, everyone, 
> I've found there was several tokens used in python's
> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
> their definition anywhere.  The tokens listed here: 

They should be documented in
http://docs.python.org/py3k/reference/lexical_analysis.html - though
apparently not using these exact terms.

> NEWLINE
Trivial: U+000A

> ENDMARKER
End of file.

> NAME
documented as "identifier" in 2.3

> INDENT
> DEDENT
Documented in 2.1.8.

> NUMBER
Documented in 2.4.3 - 2.4.6

> STRING
Documented in 2.4.2

> I've got some infomations from the source
> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
> I'm not sure which feature is only for this specified implementaion.  (I
> saw tabstop could be modified with comments using "tab-width:",
> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)

That sounds like a legacy feature that is no longer used. Somebody
familiar with the early history of Python might be able to shed more
light on the situation. It is inconsisten with the spec (section 2.1.8):

"""
Indentation is rejected as inconsistent if a source file mixes tabs and
spaces in a way that makes the meaning dependent on the worth of a tab
in spaces; a TabError is raised in that case.
"""

- Thomas


From info at wingware.com  Wed Sep 21 10:15:14 2011
From: info at wingware.com (Wingware)
Date: Wed, 21 Sep 2011 10:15:14 -0400
Subject: Wing IDE 4.0.4 released
Message-ID: <4E79F172.3070106@wingware.com>

Hi,

Wingware has released version 4.0.4 of Wing IDE, an integrated development
environment designed specifically for the Python programming language.

Wing IDE is a cross-platform Python IDE that provides a professional code
editor with vi, emacs, and other key bindings, auto-completion, call tips,
refactoring, a powerful graphical debugger, version control, unit testing,
search, and many other features.

**Changes in Version 4.0.4**

This is a maintenance release with the following changes:

* Shell history operates on whole blocks and filters by entered prefix
* Auto-editing (must be enabled with Editor > Auto-Editing preferences):
   * Auto-enter closing quotes, comments, and parentheses, braces, etc
   * Tab through auto-entered invocation arguments
   * Apply quote, comment character, or parenthesis to selection
* Use dynamic analysis for goto-definition in the editor, when available
* Support ## comments and new block syntax in Mako files
* Allow scrolling editor one page below the last line
* Refactoring can move symbols to a new file
* PyLint panel improvements, including support for version 0.23+
* Commands to copy editor and project file names to clipboard
* About 70 other minor features and bug fixes included vi mode improvements

See the change log for details.

**New Features in Version 4.0**

Version 4.0 adds the following new major features:

* Refactoring -- Rename/move symbols, extract to function/method, and 
introduce variable
* Find Uses -- Find all points of use of a symbol
* Diff/Merge -- Graphical file and repository comparison and merge
* Django Support -- Debug Django templates, run Django unit tests, and more
* matplotlib Support -- Maintains live-updating plots in shell and debugger
* Simplified Licensing -- Includes all OSes and adds Support+Upgrades 
subscriptions

Complete change log:           
http://wingware.com/pub/wingide/4.0.4/CHANGELOG.txt
Details on licensing changes:  http://wingware.com/news/2011-02-16

**About Wing IDE**

Wing IDE is an integrated development environment designed specifically for
the Python programming language.  It provides powerful editing, testing, and
debugging features that help reduce development and debugging time, cut down
on coding errors, and make it easier to understand and navigate Python code.
Wing IDE can be used to develop Python code for web, GUI, and embedded
scripting applications.

Wing IDE is available in three product levels:  Wing IDE Professional is
the full-featured Python IDE, Wing IDE Personal offers a reduced feature
set at a low price, and Wing IDE 101 is a free simplified version designed
for teaching beginning programming courses with Python.

Version 4.0 of Wing IDE Professional includes the following major features:

* Professional quality code editor with vi, emacs, and other keyboard
   personalities
* Code intelligence for Python:  Auto-completion, call tips, find uses,
   goto-definition, error indicators, refactoring, smart indent and 
rewrapping,
   and source navigation
* Advanced multi-threaded debugger with graphical UI, command line 
interaction,
   conditional breakpoints, data value tooltips over code, watch tool, and
   externally launched and remote debugging
* Powerful search and replace options including keyboard driven and 
graphical
   UIs, multi-file, wild card, and regular expression search and replace
* Version control integration for Subversion, CVS, Bazaar, git, 
Mercurial, and
   Perforce
* Integrated unit testing with unittest, nose, and doctest frameworks
* Django support:  Debugs Django templates, provides project setup tools,
   and runs Django unit tests
* Many other features including project manager, bookmarks, code snippets,
   diff/merge tool, OS command integration, indentation manager, PyLint
   integration, and perspectives
* Extremely configurable and may be extended with Python scripts
* Extensive product documentation and How-Tos for Django, matplotlib,
   Plone, wxPython, PyQt, mod_wsgi, Autodesk Maya, and many other frameworks

Please refer to http://wingware.com/wingide/features for a detailed listing
of features by product level.

System requirements are Windows 2000 or later, OS X 10.3.9 or later 
(requires
X11 Server), or a recent Linux system (either 32 or 64 bit).  Wing IDE 
supports
Python versions 2.0.x through 3.2.x and Stackless Python.

For more information, see the http://wingware.com/

**Downloads**

Wing IDE Professional and Wing IDE Personal are commercial software and
require a license to run. A free trial can be obtained directly from the
product when launched.

Wing IDE Pro -- Full-featured product:
http://wingware.com/downloads/wingide/4.0

Wing IDE Personal -- A simplified IDE:
http://wingware.com/downloads/wingide-personal/4.0

Wing IDE 101 -- For teaching with Python:
http://wingware.com/downloads/wingide-101/4.0

**Purchasing and Upgrading**

Wing 4.0 requires an upgrade for Wing IDE 2.x and 3.x users at a cost of
1/2 the full product pricing.

Upgrade a license:       https://wingware.com/store/upgrade
Purchase a new license:  https://wingware.com/store/purchase

Optional Support+Upgrades subscriptions are available for expanded
support coverage and free upgrades to new major releases:

http://wingware.com/support/agreement

Thanks!

-- 

The Wingware Team
Wingware | Python IDE
Advancing Software Development

www.wingware.com



From frank.ruiz at gmail.com  Wed Sep 21 11:44:13 2011
From: frank.ruiz at gmail.com (Frank Ruiz)
Date: Wed, 21 Sep 2011 08:44:13 -0700
Subject: Graphing
Message-ID: <CAARSQBfcSQSDKY+m-V6-iikUdOuTq4Zb=kr6_2HFdxtWhg-5NA@mail.gmail.com>

I am looking to plot some data points related to system metrics.
Benchmarking, etc. Can someone give some recommendations on a good way
to graph these datapoints in python. I started looking into
matplotlib, however was interested in others experiences.


From invalid at invalid.invalid  Wed Sep 21 12:27:32 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 21 Sep 2011 16:27:32 +0000 (UTC)
Subject: Graphing
References: <mailman.1328.1316619856.27778.python-list@python.org>
Message-ID: <j5d39k$spn$1@reader1.panix.com>

On 2011-09-21, Frank Ruiz <frank.ruiz at gmail.com> wrote:

> I am looking to plot some data points related to system metrics.
> Benchmarking, etc. Can someone give some recommendations on a good
> way to graph these datapoints in python. I started looking into
> matplotlib, however was interested in others experiences.

I've always liked gnuplot-py, but I was a gnuplot user for 10+ years
before I started using Python.  If you don't already know how to use
gnuplot, then perhaps gnuplot-py might not seem as intuitive.

http://gnuplot-py.sourceforge.net/

-- 
Grant Edwards               grant.b.edwards        Yow! Hmmm ... an arrogant
                                  at               bouquet with a subtle
                              gmail.com            suggestion of POLYVINYL
                                                   CHLORIDE ...


From ppearson at nowhere.invalid  Wed Sep 21 12:28:34 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 21 Sep 2011 16:28:34 GMT
Subject: Graphing
References: <mailman.1328.1316619856.27778.python-list@python.org>
Message-ID: <9duhliFopmU1@mid.individual.net>

On Wed, 21 Sep 2011 08:44:13 -0700, Frank Ruiz <frank.ruiz at gmail.com> wrote:
> I am looking to plot some data points related to system metrics.
> Benchmarking, etc. Can someone give some recommendations on a good way
> to graph these datapoints in python. I started looking into
> matplotlib, however was interested in others experiences.

I like biggles. Reasonably straightforward, well defaulted.
Simple plots require only simple code.

biggles.sourceforge.net

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


From csf178 at 163.com  Wed Sep 21 12:33:03 2011
From: csf178 at 163.com (=?utf-8?B?56iL5Yqt6Z2e?=)
Date: Thu, 22 Sep 2011 00:33:03 +0800 (CST)
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4E79CD6D.2030206@jollybox.de>
References: <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
Message-ID: <4521e081.ded3.1328cd55581.Coremail.csf178@163.com>

Thanks Thomas.
I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html 

but I worried it might leak some language features like "tab magic".

For I'm working on a parser with JavaScript I need a more strictly defined spec. 

Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
(Also the lexer  http://shaofei.name/python/PyLexer.html)

As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.

Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?

Please help me. Thanks a lot.
? 2011-09-21 19:41:33?"Thomas Jollans" <t at jollybox.de> ???
>On 21/09/11 11:44, ??? wrote:
>> Hi, everyone, 
>> I've found there was several tokens used in python's
>> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
>> their definition anywhere.  The tokens listed here: 
>
>They should be documented in
>http://docs.python.org/py3k/reference/lexical_analysis.html - though
>apparently not using these exact terms.
>
>> NEWLINE
>Trivial: U+000A
>
>> ENDMARKER
>End of file.
>
>> NAME
>documented as "identifier" in 2.3
>
>> INDENT
>> DEDENT
>Documented in 2.1.8.
>
>> NUMBER
>Documented in 2.4.3 - 2.4.6
>
>> STRING
>Documented in 2.4.2
>
>> I've got some infomations from the source
>> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
>> I'm not sure which feature is only for this specified implementaion.  (I
>> saw tabstop could be modified with comments using "tab-width:",
>> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
>
>That sounds like a legacy feature that is no longer used. Somebody
>familiar with the early history of Python might be able to shed more
>light on the situation. It is inconsisten with the spec (section 2.1.8):
>
>"""
>Indentation is rejected as inconsistent if a source file mixes tabs and
>spaces in a way that makes the meaning dependent on the worth of a tab
>in spaces; a TabError is raised in that case.
>"""
>
>- Thomas
>-- 
>http://mail.python.org/mailman/listinfo/python-list



From clp2 at rebertia.com  Wed Sep 21 12:53:57 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 21 Sep 2011 09:53:57 -0700
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
References: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4E79CD6D.2030206@jollybox.de>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
Message-ID: <CAMZYqRTnQ7GO0vTXOa-1TcUuE9Ar19jMMjwiWg55Up4oWhTiHg@mail.gmail.com>

On Wed, Sep 21, 2011 at 9:33 AM, ??? <csf178 at 163.com> wrote:
> Thanks Thomas.
> I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html
>
> but I worried it might leak some language features like "tab magic".
>
> For I'm working on a parser with JavaScript I need a more strictly defined spec.
>
> Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
> (Also the lexer ?http://shaofei.name/python/PyLexer.html)
>
> As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.
>
> Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?

Closest thing would be http://docs.python.org/py3k/reference/grammar.html

Cheers,
Chris


From t at jollybox.de  Wed Sep 21 12:55:45 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 21 Sep 2011 18:55:45 +0200
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
References: <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
Message-ID: <4E7A1711.8000007@jollybox.de>

On 21/09/11 18:33, ??? wrote:
> Thanks Thomas.
> I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html 
> 
> but I worried it might leak some language features like "tab magic".
> 
> For I'm working on a parser with JavaScript I need a more strictly defined spec. 
> 
> Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
> (Also the lexer  http://shaofei.name/python/PyLexer.html)
> 
> As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.
> 
> Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?

I believe the language documentation on docs.python.org is all the
documentation of the language there is. It may not be completely formal,
and in parts it concentrates not on the actual rules but on the original
implementation, but, as far as I can tell, it tells you everything you
need to know to write a new parser for the Python language, without any
ambiguity.

You appear to be anxious about implementing the indentation mechanism
correctly. The language documentation describes a behaviour precisely.
What is the problem?

Thomas

> 
> Please help me. Thanks a lot.
> ? 2011-09-21 19:41:33?"Thomas Jollans" <t at jollybox.de> ???
>> On 21/09/11 11:44, ??? wrote:
>>> Hi, everyone, 
>>> I've found there was several tokens used in python's
>>> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
>>> their definition anywhere.  The tokens listed here: 
>>
>> They should be documented in
>> http://docs.python.org/py3k/reference/lexical_analysis.html - though
>> apparently not using these exact terms.
>>
>>> NEWLINE
>> Trivial: U+000A
>>
>>> ENDMARKER
>> End of file.
>>
>>> NAME
>> documented as "identifier" in 2.3
>>
>>> INDENT
>>> DEDENT
>> Documented in 2.1.8.
>>
>>> NUMBER
>> Documented in 2.4.3 - 2.4.6
>>
>>> STRING
>> Documented in 2.4.2
>>
>>> I've got some infomations from the source
>>> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
>>> I'm not sure which feature is only for this specified implementaion.  (I
>>> saw tabstop could be modified with comments using "tab-width:",
>>> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
>>
>> That sounds like a legacy feature that is no longer used. Somebody
>> familiar with the early history of Python might be able to shed more
>> light on the situation. It is inconsisten with the spec (section 2.1.8):
>>
>> """
>> Indentation is rejected as inconsistent if a source file mixes tabs and
>> spaces in a way that makes the meaning dependent on the worth of a tab
>> in spaces; a TabError is raised in that case.
>> """
>>
>> - Thomas
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
> 



From dickinsm at gmail.com  Wed Sep 21 13:03:15 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 21 Sep 2011 10:03:15 -0700 (PDT)
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
	<mailman.1311.1316545829.27778.python-list@python.org>
	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <2f4e4d92-a1c9-4aaa-affa-d21e41f82774@w28g2000yqw.googlegroups.com>

On Sep 21, 2:07?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> After playing around with various combinations of C1, C2, D1 and D2, it
> seems to me that the rule is:
>
> If the right-hand argument is a subclass of the left-hand argument, AND also
> defines __radd__ directly rather than inheriting it, then its __radd__
> method is called before the left-hand argument's __add__ method.
>
> which strikes me as a strangely specific and not very useful rule. I suspect
> it might be an accident of implementation rather than a deliberate feature.

I'm 99.9% sure it's deliberate rather than an accident of
implementation.  See the note in the docs at:

http://docs.python.org/reference/datamodel.html#emulating-numeric-types

Support that you're subclassing int, (class MyInt(int): ...) and you
want to intercept additions of the form 3 + MyInt(4)  (perhaps because
you want MyInt to be 'contagious', so that an arithmetic operation
that combines an int and a MyInt returns a MyInt).  How would you
achieve this without this rule?

--
Mark


From csf178 at 163.com  Wed Sep 21 14:01:14 2011
From: csf178 at 163.com (Shaofei Cheng)
Date: Thu, 22 Sep 2011 02:01:14 +0800 (CST)
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4E7A1711.8000007@jollybox.de>
References: <4E7A1711.8000007@jollybox.de> <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
Message-ID: <33db1987.e15d.1328d260e2f.Coremail.csf178@163.com>

Yes, I'm using this document now but I was wondering if there is a formal spec for lexical grammar?  It looks like some part of the doc "http://docs.python.org/py3k/reference/grammar.html"  is missing. 
We can find some replacement in lexical_analysis.html but it seems this document is write for a python user instead of a guy trying to implement python.
? 2011-09-22 00:55:45?"Thomas Jollans" <t at jollybox.de> ???
>On 21/09/11 18:33, ??? wrote:
>> Thanks Thomas.
>> I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html 
>> 
>> but I worried it might leak some language features like "tab magic".
>> 
>> For I'm working on a parser with JavaScript I need a more strictly defined spec. 
>> 
>> Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
>> (Also the lexer  http://shaofei.name/python/PyLexer.html)
>> 
>> As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.
>> 
>> Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?
>
>I believe the language documentation on docs.python.org is all the
>documentation of the language there is. It may not be completely formal,
>and in parts it concentrates not on the actual rules but on the original
>implementation, but, as far as I can tell, it tells you everything you
>need to know to write a new parser for the Python language, without any
>ambiguity.
>
>You appear to be anxious about implementing the indentation mechanism
>correctly. The language documentation describes a behaviour precisely.
>What is the problem?
>
>Thomas
>
>> 
>> Please help me. Thanks a lot.
>> ? 2011-09-21 19:41:33?"Thomas Jollans" <t at jollybox.de> ???
>>> On 21/09/11 11:44, ??? wrote:
>>>> Hi, everyone, 
>>>> I've found there was several tokens used in python's
>>>> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
>>>> their definition anywhere.  The tokens listed here: 
>>>
>>> They should be documented in
>>> http://docs.python.org/py3k/reference/lexical_analysis.html - though
>>> apparently not using these exact terms.
>>>
>>>> NEWLINE
>>> Trivial: U+000A
>>>
>>>> ENDMARKER
>>> End of file.
>>>
>>>> NAME
>>> documented as "identifier" in 2.3
>>>
>>>> INDENT
>>>> DEDENT
>>> Documented in 2.1.8.
>>>
>>>> NUMBER
>>> Documented in 2.4.3 - 2.4.6
>>>
>>>> STRING
>>> Documented in 2.4.2
>>>
>>>> I've got some infomations from the source
>>>> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
>>>> I'm not sure which feature is only for this specified implementaion.  (I
>>>> saw tabstop could be modified with comments using "tab-width:",
>>>> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
>>>
>>> That sounds like a legacy feature that is no longer used. Somebody
>>> familiar with the early history of Python might be able to shed more
>>> light on the situation. It is inconsisten with the spec (section 2.1.8):
>>>
>>> """
>>> Indentation is rejected as inconsistent if a source file mixes tabs and
>>> spaces in a way that makes the meaning dependent on the worth of a tab
>>> in spaces; a TabError is raised in that case.
>>> """
>>>
>>> - Thomas
>>> -- 
>>> http://mail.python.org/mailman/listinfo/python-list
>> 
>



From ethan at stoneleaf.us  Wed Sep 21 14:15:56 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 21 Sep 2011 11:15:56 -0700
Subject: Operator commutativity
In-Reply-To: <2f4e4d92-a1c9-4aaa-affa-d21e41f82774@w28g2000yqw.googlegroups.com>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>	<9drvinFngaU1@mid.individual.net>	<mailman.1311.1316545829.27778.python-list@python.org>	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
	<2f4e4d92-a1c9-4aaa-affa-d21e41f82774@w28g2000yqw.googlegroups.com>
Message-ID: <4E7A29DC.2060205@stoneleaf.us>

Mark Dickinson wrote:
> On Sep 21, 2:07 am, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
>> After playing around with various combinations of C1, C2, D1 and D2, it
>> seems to me that the rule is:
>>
>> If the right-hand argument is a subclass of the left-hand argument, AND also
>> defines __radd__ directly rather than inheriting it, then its __radd__
>> method is called before the left-hand argument's __add__ method.
>>
>> which strikes me as a strangely specific and not very useful rule. I suspect
>> it might be an accident of implementation rather than a deliberate feature.
> 
> I'm 99.9% sure it's deliberate rather than an accident of
> implementation.  See the note in the docs at:
> 
> http://docs.python.org/reference/datamodel.html#emulating-numeric-types
> 
> Support that you're subclassing int, (class MyInt(int): ...) and you
> want to intercept additions of the form 3 + MyInt(4)  (perhaps because
> you want MyInt to be 'contagious', so that an arithmetic operation
> that combines an int and a MyInt returns a MyInt).  How would you
> achieve this without this rule?

I think Steven's objection was in not calling subclass.__radd__ when 
__radd__ is inherited rather than directly overridden.  Interestingly 
enough, the following works as expected (at least, as I expected ;)...

class C1(object):
      def __add__(self, other):
          print "C1.__add__(%r, %r)" % (self, other)

class C2(C1):
      def __radd__(self, other):
          print "C2.__radd__(%r, %r)" % (self, other)

class C3(C2):
     pass

C1() + C2()  # --> C2.__radd__(<...C2...>, <...C1...)
C1() + C3()  # --> C2.__radd__(<...C3...>, <...C1...>)
C2() + C3()  # --> C1.__add__(<...C2...>, <...C3...>)


~Ethan~


From t at jollybox.de  Wed Sep 21 14:22:27 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 21 Sep 2011 20:22:27 +0200
Subject: Where can I find a lexical spec of python?
In-Reply-To: <33db1987.e15d.1328d260e2f.Coremail.csf178@163.com>
References: <4E7A1711.8000007@jollybox.de> <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
	<33db1987.e15d.1328d260e2f.Coremail.csf178@163.com>
Message-ID: <4E7A2B63.4030505@jollybox.de>

On 21/09/11 20:01, Shaofei Cheng wrote:
> Yes, I'm using this document now but I was wondering if there is a formal spec for lexical grammar?  It looks like some part of the doc "http://docs.python.org/py3k/reference/grammar.html"  is missing. 
> We can find some replacement in lexical_analysis.html but it seems this document is write for a python user instead of a guy trying to implement python.

Yes, I understood alright what you were asking. As I said, I don't
believe there is any more formal documentation of the Python language
than what you have already seen. However, I am of the opinion that it
gives you all the information you need, and that a complete formal
grammar, while perhaps, for you, easier to interpret, would not add any
information.

Thomas





From ethan at stoneleaf.us  Wed Sep 21 15:11:12 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 21 Sep 2011 12:11:12 -0700
Subject: Operator commutativity
In-Reply-To: <4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>	<9drvinFngaU1@mid.individual.net>	<mailman.1311.1316545829.27778.python-list@python.org>
	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7A36D0.6030603@stoneleaf.us>

Steven D'Aprano wrote:
> After playing around with various combinations of C1, C2, D1 and D2, it
> seems to me that the rule is:
> 
> If the right-hand argument is a subclass of the left-hand argument, AND also
> defines __radd__ directly rather than inheriting it, then its __radd__
> method is called before the left-hand argument's __add__ method.
> 
> 
> which strikes me as a strangely specific and not very useful rule. I suspect
> it might be an accident of implementation rather than a deliberate feature.

Update to rule:

If the right-hand argument is a subclass of the left-hand argument AND a 
__radd__ is defined anywhere between the left-hand argument's class up 
to and including the right-hand argument's class, then __radd__ is 
called, otherwise the left-hand arguments __add__ is called.

And it makes perfect sense -- a + b is, after all, an __add__ function; 
the only reason to call __radd__ instead is if it has been defined for a 
subclass, and the only reason to define it is because it needs something 
different from a + b that a doesn't know about.

Probably not a clear explanation -- maybe somebody else can dress it up 
a bit.

~Ethan~


From arnodel at gmail.com  Wed Sep 21 18:04:18 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 21 Sep 2011 23:04:18 +0100
Subject: About MAKE_FUNCTION opcode in Python 3
In-Reply-To: <j5bkhc$9ld$1@dough.gmane.org>
References: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
	<CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>
	<j5bkhc$9ld$1@dough.gmane.org>
Message-ID: <CAJ6cK1Y3E3cLaANJhvMk7_Lgsyi5xZpqbktBcJ2=3RPO8yKtsA@mail.gmail.com>

On 21 September 2011 04:09, Terry Reedy <tjreedy at udel.edu> wrote:

> I agree that doc should be updated for 3.x. Please suggest a new working if
> you can, as well as copying the source snippet above. Add me terry.reedy as
> nosy.

Done: http://bugs.python.org/issue13026

-- 
Arnaud


From missive at hotmail.com  Wed Sep 21 21:35:44 2011
From: missive at hotmail.com (Lee Harr)
Date: Thu, 22 Sep 2011 06:05:44 +0430
Subject: [ANNC] pynguin-0.12  (fixes problems running on Windows)
Message-ID: <SNT106-W3945FF0EF2AD05CC9055AAB10C0@phx.gbl>


Pynguin is a python-based turtle graphics application.
??? It combines an editor, interactive interpreter, and
??? graphics display area.

It is meant to be an easy environment for introducing
??? some programming concepts to beginning programmers.


http://pynguin.googlecode.com/


This release fixes problems which prevented the program
??? from working properly on Windows systems.


Pynguin is tested with Python 2.7.1 and PyQt 4.8.3 and
??? will use Pygments syntax highlighting if available.

Pynguin is released under GPLv3.


Changes in pynguin-0.12:
??? Important fixes
??????? - Fixed menu items and dialogs not working on Windows
??????? - Fixed error on Windows when trying to write backup files

??? Pynguin API
??????? - bgcolor()
??????? - raise exception if using color component outside of 0-255
??????? - make util.nudge_color() API match util.choose_color()

??? Canvas
??????? - allow setting background color
??????? - fix custom svg avatars to allow any size avatar

??? Integrated Editor
??????? - comment / uncomment line / region

??? Integrated Console
??????? - added command to clear history
??????? - clears line before writing commands selected in menu

??? Examples
??????? - added fractals example file

 		 	   		  


From bahamutzero8825 at gmail.com  Wed Sep 21 21:53:04 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Wed, 21 Sep 2011 20:53:04 -0500
Subject: Odd behavior with imp.reload and logging
Message-ID: <4E7A9500.2070101@gmail.com>

When using a logger in a module and then using imp.reload to reload the
module, logger messages are repeated in direct proportion to the number
of times the modules was loaded. That is, on the first import, the
message is written once, but on the second run, each message is written
twice, three times on the third run, and so on.

With this code:

> import logging
> 
> test_logger = logging.getLogger(__name__)
> console_handler = logging.StreamHandler()
> console_formatter = logging.Formatter('{asctime} - {module} - {funcName} - line {lineno} - {levelname} - {message}', style='{')
> console_handler.setFormatter(console_formatter)
> test_logger.addHandler(console_handler)
> test_logger.setLevel(logging.DEBUG)
> 
> test_logger.info('Test info')

I get this in the interpreter:

> Python 3.2.2 (default, Sep  4 2011, 09:07:29) [MSC v.1500 64 bit (AMD64)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import os, imp
>>>> import test2
> 2011-09-21 20:51:02,421 - test2 - <module> - line 11 - INFO - Test info
>>>> imp.reload(test2)
> 2011-09-21 20:51:10,665 - test2 - <module> - line 11 - INFO - Test info
> 2011-09-21 20:51:10,665 - test2 - <module> - line 11 - INFO - Test info
> <module 'test2' from 'test2.py'>


What causes this, and how can I fix it (or at least work around it)? Due
to the nature of the program, it's much more convenient to reload a
module than to restart the entire program (especially when testing).

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2
PGP/GPG Public Key ID: 0xF88E034060A78FCB


From rosuav at gmail.com  Wed Sep 21 21:57:42 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 11:57:42 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7A9500.2070101@gmail.com>
References: <4E7A9500.2070101@gmail.com>
Message-ID: <CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>

On Thu, Sep 22, 2011 at 11:53 AM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> What causes this, and how can I fix it (or at least work around it)? Due
> to the nature of the program, it's much more convenient to reload a
> module than to restart the entire program (especially when testing).
>

Unfortunately, Python doesn't really like modules to be reloaded. Are
you able to explicitly close the logger before reloading?

ChrisA


From bahamutzero8825 at gmail.com  Wed Sep 21 22:44:20 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Wed, 21 Sep 2011 21:44:20 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>
References: <4E7A9500.2070101@gmail.com>
	<CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>
Message-ID: <4E7AA104.7050009@gmail.com>

On 2011.09.21 08:57 PM, Chris Angelico wrote:
> Unfortunately, Python doesn't really like modules to be reloaded. Are
> you able to explicitly close the logger before reloading?
The reload isn't controlled by the module, but I have no problem
clearing out any loggers at the beginning. I'm looking through the
logging docs, but I don't see what you mean by explicitly closing the
logger. Handler.close() doesn't help.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From rosuav at gmail.com  Wed Sep 21 22:48:04 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 12:48:04 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7AA104.7050009@gmail.com>
References: <4E7A9500.2070101@gmail.com>
	<CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>
	<4E7AA104.7050009@gmail.com>
Message-ID: <CAPTjJmpPC96hKZTbzxzVbC7cx1nQ1T8c6UhXr7YM-BG7n5ELUg@mail.gmail.com>

On Thu, Sep 22, 2011 at 12:44 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> The reload isn't controlled by the module, but I have no problem
> clearing out any loggers at the beginning.

I'm thinking more along the lines of closing them in the old module
before firing imp.reload() - maybe have a function in the module that
cleans itself up and then reloads itself. And yes, I had been thinking
of closing the handler, but I don't know the logging module much.

ChrisA


From atherun at gmail.com  Wed Sep 21 23:09:05 2011
From: atherun at gmail.com (Atherun)
Date: Wed, 21 Sep 2011 20:09:05 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
Message-ID: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>

This is on windows with python 2.6.
I can't seem to remove a possibility of a  deadlock in one of my
scripts at the moment.  Its not a constant deadlock but it appears
from time to time.  The code is below:

try:

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

        NotDone = True
        data = []
        while NotDone:
            NotDone = False

            result = process.poll()
            if result == None:
                NotDone = True
            if NotDone:
                out, err = process.communicate()
                Log(out)

I was able to get the program to write out the stack trace for my
threads and it is usually deadlocked on sys.stdout.read or
_internal_poll of subproceess.

I've even tried the above, with using "with
tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
it still deadlocks.  In the past I work around this by running fewer
processes asynchronously but I would really like to get this solved so
I don't have to wait to see if it'll be caused with any changes I
make.

Any tips would be appreciated.


From roy at panix.com  Wed Sep 21 23:32:19 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 21 Sep 2011 23:32:19 -0400
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
Message-ID: <roy-E8A301.23321921092011@news.panix.com>

In article 
<098f3d78-85f5-44e7-ba72-f2270a24d1b0 at o9g2000vbo.googlegroups.com>,
 Atherun <atherun at gmail.com> wrote:

> This is on windows with python 2.6.
> I can't seem to remove a possibility of a  deadlock in one of my
> scripts at the moment.  Its not a constant deadlock but it appears
> from time to time.  The code is below:
> 
> try:
> 
>         process =
> subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
> 
>         NotDone = True
>         data = []
>         while NotDone:
>             NotDone = False
> 
>             result = process.poll()
>             if result == None:
>                 NotDone = True
>             if NotDone:
>                 out, err = process.communicate()
>                 Log(out)
> 
> I was able to get the program to write out the stack trace for my
> threads and it is usually deadlocked on sys.stdout.read or
> _internal_poll of subproceess.
> 
> I've even tried the above, with using "with
> tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
> it still deadlocks.  In the past I work around this by running fewer
> processes asynchronously but I would really like to get this solved so
> I don't have to wait to see if it'll be caused with any changes I
> make.
> 
> Any tips would be appreciated.

My reading of the docs 
(http://docs.python.org/release/2.6.7/library/subprocess.html#popen-objec
ts) says that Popen.poll() doesn't return a value, it sets the object's 
return code attribute, which you can then interrogate.

More than that, your loop logic looks amazingly complicated for what's 
basically a simple thing.  I suggest something along the lines of:

   # assuming process.returncode is initially None 
   while process.returncode is None:
      out, err = process.communicate()
      Log(out)

I haven't tested that, but I think (from reading the docs) that's the 
right idea.


From clp2 at rebertia.com  Wed Sep 21 23:33:37 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 21 Sep 2011 20:33:37 -0700
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
Message-ID: <CAMZYqRT_Dw_dBCas+UyKjYLf7BdDCMQrqDygFubDJqP0TeFxTQ@mail.gmail.com>

On Wed, Sep 21, 2011 at 8:09 PM, Atherun <atherun at gmail.com> wrote:
> This is on windows with python 2.6.
> I can't seem to remove a possibility of a ?deadlock in one of my
> scripts at the moment. ?Its not a constant deadlock but it appears
> from time to time. ?The code is below:
>
> try:
>
> ? ? ? ?process =
> subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
>
> ? ? ? ?NotDone = True
> ? ? ? ?data = []
> ? ? ? ?while NotDone:
> ? ? ? ? ? ?NotDone = False
>
> ? ? ? ? ? ?result = process.poll()
> ? ? ? ? ? ?if result == None:
> ? ? ? ? ? ? ? ?NotDone = True
> ? ? ? ? ? ?if NotDone:
> ? ? ? ? ? ? ? ?out, err = process.communicate()
> ? ? ? ? ? ? ? ?Log(out)
>
> I was able to get the program to write out the stack trace for my
> threads and it is usually deadlocked on sys.stdout.read or
> _internal_poll of subproceess.
>
> I've even tried the above, with using "with
> tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
> it still deadlocks. ?In the past I work around this by running fewer
> processes asynchronously but I would really like to get this solved so
> I don't have to wait to see if it'll be caused with any changes I
> make.
>
> Any tips would be appreciated.

Your polling loop is completely pointless. The code can be simplified to:

process = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
out, err = process.communicate()
log(out)

Depending on the particular program you're running in a subprocess,
you may need to take heed of the Note in the communicate() docs:
"Note: The data read is buffered in memory, so *do not use this
method* if the data size is large or unlimited." [Emphasis added]

Cheers,
Chris
--
http://rebertia.com


From atherun at gmail.com  Wed Sep 21 23:42:53 2011
From: atherun at gmail.com (Atherun)
Date: Wed, 21 Sep 2011 20:42:53 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
Message-ID: <5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>

On Sep 21, 8:33?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Wed, Sep 21, 2011 at 8:09 PM, Atherun <athe... at gmail.com> wrote:
> > This is on windows with python 2.6.
> > I can't seem to remove a possibility of a ?deadlock in one of my
> > scripts at the moment. ?Its not a constant deadlock but it appears
> > from time to time. ?The code is below:
>
> > try:
>
> > ? ? ? ?process =
> > subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
>
> > ? ? ? ?NotDone = True
> > ? ? ? ?data = []
> > ? ? ? ?while NotDone:
> > ? ? ? ? ? ?NotDone = False
>
> > ? ? ? ? ? ?result = process.poll()
> > ? ? ? ? ? ?if result == None:
> > ? ? ? ? ? ? ? ?NotDone = True
> > ? ? ? ? ? ?if NotDone:
> > ? ? ? ? ? ? ? ?out, err = process.communicate()
> > ? ? ? ? ? ? ? ?Log(out)
>
> > I was able to get the program to write out the stack trace for my
> > threads and it is usually deadlocked on sys.stdout.read or
> > _internal_poll of subproceess.
>
> > I've even tried the above, with using "with
> > tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
> > it still deadlocks. ?In the past I work around this by running fewer
> > processes asynchronously but I would really like to get this solved so
> > I don't have to wait to see if it'll be caused with any changes I
> > make.
>
> > Any tips would be appreciated.
>
> Your polling loop is completely pointless. The code can be simplified to:
>
> process = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
> out, err = process.communicate()
> log(out)
>
> Depending on the particular program you're running in a subprocess,
> you may need to take heed of the Note in the communicate() docs:
> "Note: The data read is buffered in memory, so *do not use this
> method* if the data size is large or unlimited." [Emphasis added]
>
> Cheers,
> Chris
> --http://rebertia.com

I'm pretty sure thats the problem, this is a generic catch all
function for running subprocesses.  It can be anything to a simple
command to a complex command with a ton of output.  I'm looking for a
better solution to handle the case of running subprocesses that have
an undetermined amount of output. (i.e. p4 edit's or tools that have
an excessive amount of logging)

I'll definitely simplify the loop, thanks for the tip on that part.


From clp2 at rebertia.com  Wed Sep 21 23:52:02 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 21 Sep 2011 20:52:02 -0700
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <roy-E8A301.23321921092011@news.panix.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<roy-E8A301.23321921092011@news.panix.com>
Message-ID: <CAMZYqRRvZjkHDdafwyf758fFo=vbT=ORP-2iqiLb-o4qaCqM2Q@mail.gmail.com>

On Wed, Sep 21, 2011 at 8:32 PM, Roy Smith <roy at panix.com> wrote:
<snip>
> My reading of the docs
> (http://docs.python.org/release/2.6.7/library/subprocess.html#popen-objec
> ts) says that Popen.poll() doesn't return a value, it sets the object's
> return code attribute, which you can then interrogate.

Popen.poll():
    Check if child process has terminated. Set **and return**
returncode attribute.
[Direct quote from the docs; emphasis added]

> More than that, your loop logic looks amazingly complicated for what's
> basically a simple thing. ?I suggest something along the lines of:
>
> ? # assuming process.returncode is initially None
> ? while process.returncode is None:
> ? ? ?out, err = process.communicate()
> ? ? ?Log(out)
>
> I haven't tested that, but I think (from reading the docs) that's the
> right idea.

There is no point in communicate()-ing multiple times; communicate()
reads until EOF and only returns after subprocess termination!

Cheers,
Chris


From roy at panix.com  Wed Sep 21 23:58:19 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 21 Sep 2011 23:58:19 -0400
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<roy-E8A301.23321921092011@news.panix.com>
	<mailman.1343.1316663531.27778.python-list@python.org>
Message-ID: <roy-E3E50A.23581921092011@news.panix.com>

In article <mailman.1343.1316663531.27778.python-list at python.org>,
 Chris Rebert <clp2 at rebertia.com> wrote:

> Popen.poll():
>     Check if child process has terminated. Set **and return**
> returncode attribute.
> [Direct quote from the docs; emphasis added]

Doh.  I read right past that and didn't see it.  Thanks for the 
correction.


From steve+comp.lang.python at pearwood.info  Thu Sep 22 00:22:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 22 Sep 2011 04:22:39 GMT
Subject: Odd behavior with imp.reload and logging
References: <mailman.1338.1316656397.27778.python-list@python.org>
Message-ID: <4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>

On Wed, 21 Sep 2011 20:53:04 -0500, Andrew Berg wrote:

> When using a logger in a module and then using imp.reload to reload the
> module, logger messages are repeated in direct proportion to the number
> of times the modules was loaded. That is, on the first import, the
> message is written once, but on the second run, each message is written
> twice, three times on the third run, and so on.
[...]
> What causes this, and how can I fix it (or at least work around it)? Due
> to the nature of the program, it's much more convenient to reload a
> module than to restart the entire program (especially when testing).

You unconditionally add a handler every time you reload the module, 
regardless of whether or not the old handler is still there. You could 
try something like this (untested):


import logging
test_logger = logging.getLogger(__name__)
if not test_logger.handlers:
    console_handler = logging.StreamHandler()
    console_formatter = logging.Formatter(
       '{asctime} - {module} - {funcName} - line {lineno} - ' 
       '{levelname} - {message}', style='{'
       )
    console_handler.setFormatter(console_formatter)
    test_logger.addHandler(console_handler)
    test_logger.setLevel(logging.DEBUG)

test_logger.info('Test info')



-- 
Steven


From bahamutzero8825 at gmail.com  Thu Sep 22 00:47:55 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Wed, 21 Sep 2011 23:47:55 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7ABDFB.5020509@gmail.com>

On 2011.09.21 11:22 PM, Steven D'Aprano wrote:
> You could 
> try something like this (untested):
That works. Thanks!
This makes me wonder what else stays around after a reload and what side
effects there are, though. I would really like to purge everything from
the previous import. The main program has no dependence on the module
whatsoever.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From atherun at gmail.com  Thu Sep 22 00:52:42 2011
From: atherun at gmail.com (Atherun)
Date: Wed, 21 Sep 2011 21:52:42 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<roy-E8A301.23321921092011@news.panix.com>
	<mailman.1343.1316663531.27778.python-list@python.org>
	<roy-E3E50A.23581921092011@news.panix.com>
Message-ID: <56b9526d-fdd5-4f9d-bd39-d17b84f12141@h7g2000yqm.googlegroups.com>

On Sep 21, 8:58?pm, Roy Smith <r... at panix.com> wrote:
> In article <mailman.1343.1316663531.27778.python-l... at python.org>,
> ?Chris Rebert <c... at rebertia.com> wrote:
>
> > Popen.poll():
> > ? ? Check if child process has terminated. Set **and return**
> > returncode attribute.
> > [Direct quote from the docs; emphasis added]
>
> Doh. ?I read right past that and didn't see it. ?Thanks for the
> correction.

I removed the loop and changed it to a single communicate now, still
get a deadlock.  All threads just stop, even threads that have nothing
to do with the ongoing subprocesses.  I specifically created a thread
that dumps the stack trace of all threads so I can try and view the
deadlocks, but that stops responding at the same time as the
deadlock.  This wasn't happening before so not sure why it changed
suddenly.


From rosuav at gmail.com  Thu Sep 22 01:09:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 15:09:49 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7ABDFB.5020509@gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
Message-ID: <CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 2:47 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> This makes me wonder what else stays around after a reload and what side
> effects there are, though. I would really like to purge everything from
> the previous import. The main program has no dependence on the module
> whatsoever.
>

On-the-fly reloading of modules isn't really one of Python's
strengths. Everyone who asks about it seems to be doing rapid
development/debugging and wanting to save on startup time (as opposed
to, say, running a server and updating code in it while it's active
and serving clients), so the question becomes: Which is more of a
problem, startup delay or the risk that it's not the same as a clean
start? Python doesn't guarantee that your debugging session is going
to be useful - if you reload that module and weird things happen, it
could be because of reload(), not because of a module bug.

Ranting Rick will probably expect me to mention Pike here, but I
won't. Muahahahaha..... oh. I just did. Oh well!

ChrisA


From yves at zioup.com  Thu Sep 22 01:24:03 2011
From: yves at zioup.com (yves at zioup.com)
Date: Wed, 21 Sep 2011 23:24:03 -0600
Subject: with statements does not delete the object
Message-ID: <UDzeq.31563$Ol1.10576@newsfe07.iad>


Is this the expected behaviour:


     with mylib.token() as t:
       do_something

     dir()

In the last dir(), after the with "loop" is finished, t still shows up... I 
expected it to be unreferenced by then.

-- 
Yves.                                                  http://www.SollerS.ca/
                                                        http://ipv6.SollerS.ca
                                                        http://blog.zioup.org/


From bahamutzero8825 at gmail.com  Thu Sep 22 01:54:10 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Thu, 22 Sep 2011 00:54:10 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
Message-ID: <4E7ACD82.4080302@gmail.com>

On 2011.09.22 12:09 AM, Chris Angelico wrote:
> On-the-fly reloading of modules isn't really one of Python's
> strengths. Everyone who asks about it seems to be doing rapid
> development/debugging and wanting to save on startup time (as opposed
> to, say, running a server and updating code in it while it's active
> and serving clients), so the question becomes: Which is more of a
> problem, startup delay or the risk that it's not the same as a clean
> start? Python doesn't guarantee that your debugging session is going
> to be useful - if you reload that module and weird things happen, it
> could be because of reload(), not because of a module bug.
The main program is an IRC bot, which could potentially be in use by
many people in several channels on a network. As it is, the bot can only
connect to one server, but it could probably be set up to connect to any
number of networks. Making a number of quick fixes or changes to one
module could be very irritating to users if the bot has to terminate
each time, especially if those users don't know or care about that
specific module.
Startup time is an issue because it must connect to a network before it
can take any input. Also, many disconnects/reconnects could easily cause
problems (like the network refusing the connection as a DoS prevention
measure).
I'm not tied to any particular solution, and it's quite possible I'm
missing something since I am still a beginner.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From ben+python at benfinney.id.au  Thu Sep 22 02:01:05 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 22 Sep 2011 16:01:05 +1000
Subject: with statements does not delete the object
References: <UDzeq.31563$Ol1.10576@newsfe07.iad>
Message-ID: <871uv92k0u.fsf@benfinney.id.au>

yves at zioup.com writes:

> Is this the expected behaviour:

You can learn the expected behaviour for ?with? in the documentation
<URL:http://docs.python.org/reference/compound_stmts.html#the-with-statement>.

>     with mylib.token() as t:
>       do_something
>
>     dir()
>
> In the last dir(), after the with "loop" is finished, t still shows up... I
> expected it to be unreferenced by then.

What gives you that expectation, when it's not the case for any of ?if?,
?for?, ?while?, ?try?, and so on?

The set of statements which introduce a new scope is small, and ?with?
is not one of them.

-- 
 \             ?No smoothen the lion.? ?lion cage, zoo, Czech Republic |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From steve+comp.lang.python at pearwood.info  Thu Sep 22 02:12:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 22 Sep 2011 06:12:01 GMT
Subject: Environment variables not visible from Python
Message-ID: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>

I don't understand why some environment variables are not visible from 
Python.

[steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
30 140 xterm
[steve at wow-wow ~]$ python2.6
Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
(None, None, 'xterm')



-- 
Steven


From airween at gmail.com  Thu Sep 22 02:37:22 2011
From: airween at gmail.com (=?utf-8?B?SGVnZWTDvHMs?= Ervin)
Date: Thu, 22 Sep 2011 08:37:22 +0200
Subject: Environment variables not visible from Python
In-Reply-To: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110922063721.GA3655@arxnet.hu>

hello,

On Thu, Sep 22, 2011 at 06:12:01AM +0000, Steven D'Aprano wrote:
> I don't understand why some environment variables are not visible from 
> Python.
> 
> [steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
> 30 140 xterm
> [steve at wow-wow ~]$ python2.6
> Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import os
> >>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
> (None, None, 'xterm')

I think TERM is inherited from parent shell, but LINES and
COLUMNS are re-created every child shell. IMHO it's normally,
cause TERM will not change in child, but another variables should
changed...


Look at this:

airween at sebulba:~$ export LINES COLUMNS TERM
airween at sebulba:~$ python2.6
Python 2.6.6 (r266:84292, Mar 25 2011, 19:24:58) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
('65', '210', 'rxvt-256color')


a.
 


From kushal.kumaran+python at gmail.com  Thu Sep 22 02:40:08 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Thu, 22 Sep 2011 12:10:08 +0530
Subject: Environment variables not visible from Python
In-Reply-To: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAH8GtdN767QV=rWZDimmkGqJ8HgC4cjStW2LXx5ER21uZiOcAQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 11:42 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> I don't understand why some environment variables are not visible from
> Python.
>
> [steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
> 30 140 xterm
> [steve at wow-wow ~]$ python2.6
> Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import os
>>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
> (None, None, 'xterm')
>
>

I have this:

$ python
Python 2.6.6 (r266:84292, Sep 15 2010, 16:22:56)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.getenv('LINES')
>>>
$ python -S
Python 2.6.6 (r266:84292, Sep 15 2010, 16:22:56)
[GCC 4.4.5] on linux2
>>> import os
>>> os.getenv('LINES')
'35'
>>>

I hope it helps narrow things down somewhat.

-- 
regards,
kushal


From rosuav at gmail.com  Thu Sep 22 02:46:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 16:46:59 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7ACD82.4080302@gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
Message-ID: <CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 3:54 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> The main program is an IRC bot, which could potentially be in use by
> many people in several channels on a network. As it is, the bot can only
> connect to one server, but it could probably be set up to connect to any
> number of networks. Making a number of quick fixes or changes to one
> module could be very irritating to users if the bot has to terminate
> each time, especially if those users don't know or care about that
> specific module.
> Startup time is an issue because it must connect to a network before it
> can take any input. Also, many disconnects/reconnects could easily cause
> problems (like the network refusing the connection as a DoS prevention
> measure).

Playing with networking and the desire to reload without restarting? I
think Pike may be a good choice for you. It has a C-like syntax but
Python-like guts; you use braces to delimit blocks of code, but arrays
and mappings and such are first-class objects that you can pass around
and use. It's a favorite of mine, but quite off-topic for this mailing
list; I'd be happy to help you get started with it.

Chris Angelico


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 03:21:59 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 09:21:59 +0200
Subject: Environment variables not visible from Python
In-Reply-To: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5enmt$uva$1@r03.glglgl.eu>

Am 22.09.2011 08:12 schrieb Steven D'Aprano:
> I don't understand why some environment variables are not visible from
> Python.
>
> [steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
> 30 140 xterm
> [steve at wow-wow ~]$ python2.6
> Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import os
>>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
> (None, None, 'xterm')
>

They are no environment variables, but merely shell variables.

You can turn them into environment variables with the shell command 
"export". After exporting them, they are visible by Python.

The environment can be obtained with env.

So try:

$ python -c 'import os; print "\n".join(sorted("%s=%s" % (k,v) for k,v 
in os.environ.iteritems()))' | diff -u - <(env|LANG=C sort)
@@ -61,4 +61,4 @@
  XDG_DATA_DIRS=/usr/share
  XKEYSYMDB=/usr/share/X11/XKeysymDB
  XNLSPATH=/usr/share/X11/nls
-_=/usr/bin/python
+_=/usr/bin/env

and you see that they (nearly) match.


Try as well

$ python -c 'import os; print "\n".join(os.getenv(k) or "" for k in 
("LINES","COLUMNS","TERM"))'


linux
$ export LINES
$ python -c 'import os; print "\n".join(os.getenv(k) or "" for k in 
("LINES","COLUMNS","TERM"))'
24

linux
$ export COLUMNS
$ python -c 'import os; print "\n".join(os.getenv(k) or "" for k in 
("LINES","COLUMNS","TERM"))'
24
80
linux
$

HTH,

Thomas


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 03:24:53 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 09:24:53 +0200
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
Message-ID: <j5ensa$v1i$1@r03.glglgl.eu>

Am 22.09.2011 05:42 schrieb Atherun:

> I'm pretty sure thats the problem, this is a generic catch all
> function for running subprocesses.  It can be anything to a simple
> command to a complex command with a ton of output.  I'm looking for a
> better solution to handle the case of running subprocesses that have
> an undetermined amount of output.

Just handle process.stdout/stderr by yourself - read it out until EOF 
and then wait() for the process.


Thomas


From ericsnowcurrently at gmail.com  Thu Sep 22 03:45:20 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Thu, 22 Sep 2011 01:45:20 -0600
Subject: static statements and thread safety
Message-ID: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>

A recent thread on the python-ideas list got me thinking about the
possibility of a static statement (akin to global and nonlocal).  I am
wondering if an implementation would have to address thread safety
concerns.

I would expect that static variables would work pretty much the same
way as default arguments, with a list of names on the code object and
a list of values on the function object.  And I would guess that the
values from the static variables would get updated on the function
object at the end of the call.  If multiple threads are executing the
function at the same time won't there be a problem with that
end-of-call update?

-eric


p.s. It probably shows that I haven't done a lot of thread-related
programming, so perhaps this is not a hard question.


From bahamutzero8825 at gmail.com  Thu Sep 22 03:59:42 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Thu, 22 Sep 2011 02:59:42 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
	<CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
Message-ID: <4E7AEAEE.20504@gmail.com>

On 2011.09.22 01:46 AM, Chris Angelico wrote:
> I think Pike may be a good choice for you.
That's quite unappealing for a few reasons. First, that would likely
require writing an entirely new bot (I'm not even that familiar with the
current one; I've only been writing a module for it). Also, I don't
really enjoy programming (I'm aware I'm likely in the minority on this
list); I tolerate it enough to get certain things done, so learning
another language, especially when I'm still learning Python, is not
something I want to do. Python is probably not the best tool for this
particular job, but I am not nearly dedicated to this project enough to
learn another programming language.

So, is there any way to at least monitor what happens after a reload? I
haven't noticed anything odd until I came across this logging issue.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From rosuav at gmail.com  Thu Sep 22 04:06:45 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 18:06:45 +1000
Subject: static statements and thread safety
In-Reply-To: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
Message-ID: <CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>

On Thu, Sep 22, 2011 at 5:45 PM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
> I would expect that static variables would work pretty much the same
> way as default arguments

Could you just abuse default arguments to accomplish this?

def accumulate(n,statics={'sum':0}):
    statics['sum']+=n
    return statics['sum']

>>> accumulate(1)
1
>>> accumulate(10)
11
>>> accumulate(20)
31
>>> accumulate(14)
45

This eliminates any sort of "end of function write-back" by writing to
static storage immediately. Of course, syntactic assistance would make
this look cleaner, for instance:

def accumulate(n):
    static sum=0
    sum+=n
    return sum

Both of these would, of course, have thread-safety issues. But these
can be resolved by figuring out exactly what you're trying to
accomplish with your static data, and what it really means when two
threads are affecting it at once.

ChrisA


From rosuav at gmail.com  Thu Sep 22 04:12:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 18:12:49 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7AEAEE.20504@gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
	<CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
	<4E7AEAEE.20504@gmail.com>
Message-ID: <CAPTjJmrzvFwqD_w5BxaQycSzsFSwVFiPzFKEAdhF=1_scw7ReQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 5:59 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> That's quite unappealing for a few reasons. First, that would likely
> require writing an entirely new bot (I'm not even that familiar with the
> current one; I've only been writing a module for it).

Ah, then yeah, it's probably not a good idea to change languages. But
you may end up finding other issues with reload() as well.

I wonder whether this would work...

modules=[]

# instead of 'import mymodule' use:
modules.append(__import__('mymodule')); mymodule=modules[-1]

In theory, this should mean that you load it fresh every time - I
think. If not, manually deleting entries from sys.modules might help,
either with or without the list of modules.

ChrisA


From ladasky at my-deja.com  Thu Sep 22 04:13:12 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 22 Sep 2011 01:13:12 -0700 (PDT)
Subject: Graphing
References: <mailman.1328.1316619856.27778.python-list@python.org>
Message-ID: <b6c01506-e10f-457a-a039-9e63d393d021@f12g2000yqi.googlegroups.com>

I'm using matplotlib and I'm happy with it.  Quick plotting is easy
using the pyplot interface, which resembles the popular software
package MATLAB.  As your ambitions grow, matplotlib has many
sophisticated tools waiting for you.


From ericsnowcurrently at gmail.com  Thu Sep 22 04:16:11 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Thu, 22 Sep 2011 02:16:11 -0600
Subject: static statements and thread safety
In-Reply-To: <CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
	<CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>
Message-ID: <CALFfu7A7qx+bhr0r4OToJLXR54_OStKbbYEr+0BKCxpO7g3MnQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 2:06 AM, Chris Angelico <rosuav at gmail.com> wrote:
> On Thu, Sep 22, 2011 at 5:45 PM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
>> I would expect that static variables would work pretty much the same
>> way as default arguments
>
> Could you just abuse default arguments to accomplish this?
>
> def accumulate(n,statics={'sum':0}):
> ? ?statics['sum']+=n
> ? ?return statics['sum']
>
>>>> accumulate(1)
> 1
>>>> accumulate(10)
> 11
>>>> accumulate(20)
> 31
>>>> accumulate(14)
> 45
>
> This eliminates any sort of "end of function write-back" by writing to
> static storage immediately. Of course, syntactic assistance would make
> this look cleaner, for instance:
>
> def accumulate(n):
> ? ?static sum=0
> ? ?sum+=n
> ? ?return sum
>
> Both of these would, of course, have thread-safety issues. But these
> can be resolved by figuring out exactly what you're trying to
> accomplish with your static data, and what it really means when two
> threads are affecting it at once.

That's a good point.  So, isn't the default arguments hack in the same
boat with regards to threads?

Maybe I'm just misunderstanding the thread concept in Python.  Threads
have separate execution stacks but share interpreter global state,
right?

-eric

>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rosuav at gmail.com  Thu Sep 22 04:18:28 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 18:18:28 +1000
Subject: static statements and thread safety
In-Reply-To: <CALFfu7A7qx+bhr0r4OToJLXR54_OStKbbYEr+0BKCxpO7g3MnQ@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
	<CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>
	<CALFfu7A7qx+bhr0r4OToJLXR54_OStKbbYEr+0BKCxpO7g3MnQ@mail.gmail.com>
Message-ID: <CAPTjJmoQ4_BdupvM=XL3_9=B6OUQSajnOV3o4UpAp16A8Gty_g@mail.gmail.com>

On Thu, Sep 22, 2011 at 6:16 PM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
> That's a good point. ?So, isn't the default arguments hack in the same
> boat with regards to threads?
>
> Maybe I'm just misunderstanding the thread concept in Python. ?Threads
> have separate execution stacks but share interpreter global state,
> right?

I would say it probably is, but others on this list will know more of
threading in Python. I tend not to write multithreaded programs in
Python - the main reason for me to use Python is rapid scriptwriting,
which usually doesn't demand threads.

ChrisA


From steve+comp.lang.python at pearwood.info  Thu Sep 22 04:25:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 22 Sep 2011 08:25:39 GMT
Subject: Odd behavior with imp.reload and logging
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1344.1316666895.27778.python-list@python.org>
Message-ID: <4e7af102$0$30000$c3e8da3$5496439d@news.astraweb.com>

On Wed, 21 Sep 2011 23:47:55 -0500, Andrew Berg wrote:

> On 2011.09.21 11:22 PM, Steven D'Aprano wrote:
>> You could
>> try something like this (untested):
> That works. Thanks!
> This makes me wonder what else stays around after a reload 

Practically everything. A reload doesn't delete anything, except as a 
side-effect of running the module again.

Don't think of reloading as:

  * Revert anything the module is responsible for.
  * Delete the module object from the import cache.
  * Import the module in a fresh environment.

Instead, think of it as:

  * Re-import the module in the current environment.


In practice, you won't often see such side-effects, because most modules 
don't store state outside of themselves. If they store state *inside* 
themselves, then they will (almost always) overwrite that state. E.g. 
this will work as expected:


state = [something]


But this leaves state hanging around in other modules and will be 
surprising:

import another_module
another_module.state.append(something)


My guess is that the logging module uses a cache to save the logger, 
hence there is state inadvertently stored outside your module.


Another place where reload() doesn't work as expected:

>>> import module
>>> a = module.MyClass()
>>> reload(module)
<module 'module' from 'module.pyc'>
>>> b = module.MyClass()
>>> type(a) is type(b)
False


Objects left lying around from before the reload will keep references 
open to the way things were before the reload. This often leads to 
confusion when modules are edited, then reloaded. (Been there, done that.)



-- 
Steven


From bahamutzero8825 at gmail.com  Thu Sep 22 05:02:48 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Thu, 22 Sep 2011 04:02:48 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4e7af102$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1344.1316666895.27778.python-list@python.org>
	<4e7af102$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7AF9B8.7020802@gmail.com>

On 2011.09.22 03:25 AM, Steven D'Aprano wrote:
> Objects left lying around from before the reload will keep references 
> open to the way things were before the reload. This often leads to 
> confusion when modules are edited, then reloaded. (Been there, done that.)
I'll keep that in mind. My module does have a class, but instances are
kept inside dictionaries, which are explicitly set to {} at the
beginning (can't use the update() method for dictionaries that don't
exist). Also, class instances get pickled after creation and unpickled
when the module is imported.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From chris at simplistix.co.uk  Thu Sep 22 05:27:36 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Thu, 22 Sep 2011 10:27:36 +0100
Subject: python install on locked down windows box?
Message-ID: <4E7AFF88.2040308@simplistix.co.uk>

Hi All,

Is there a way to install python on a locked down Windows desktop?
(ie: no compilers, no admin rights, etc)

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From ben+python at benfinney.id.au  Thu Sep 22 06:16:47 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 22 Sep 2011 20:16:47 +1000
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87wrd0286o.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I don't understand why some environment variables are not visible from 
> Python.

Not all variables are environment variables. Variables only become
environment variables if exported to the environment; the ?export?
command is one way to do that.

-- 
 \       ?As far as the laws of mathematics refer to reality, they are |
  `\    not certain, and as far as they are certain, they do not refer |
_o__)                              to reality.? ?Albert Einstein, 1983 |
Ben Finney


From zondo42 at gmail.com  Thu Sep 22 06:19:05 2011
From: zondo42 at gmail.com (Glenn Hutchings)
Date: Thu, 22 Sep 2011 03:19:05 -0700 (PDT)
Subject: python install on locked down windows box?
In-Reply-To: <mailman.1357.1316683648.27778.python-list@python.org>
References: <mailman.1357.1316683648.27778.python-list@python.org>
Message-ID: <13828134.867.1316686745332.JavaMail.geo-discussion-forums@yqbr29>

You could try Portable Python (http://www.portablepython.com).  No need to install anything!


From zondo42 at gmail.com  Thu Sep 22 06:19:05 2011
From: zondo42 at gmail.com (Glenn Hutchings)
Date: Thu, 22 Sep 2011 03:19:05 -0700 (PDT)
Subject: python install on locked down windows box?
In-Reply-To: <mailman.1357.1316683648.27778.python-list@python.org>
References: <mailman.1357.1316683648.27778.python-list@python.org>
Message-ID: <13828134.867.1316686745332.JavaMail.geo-discussion-forums@yqbr29>

You could try Portable Python (http://www.portablepython.com).  No need to install anything!


From gavinpanella at gmail.com  Thu Sep 22 06:21:28 2011
From: gavinpanella at gmail.com (Gavin Panella)
Date: Thu, 22 Sep 2011 03:21:28 -0700 (PDT)
Subject: Context manager with class methods
Message-ID: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>

Hi,

On Python 2.6 and 3.1 the following code works fine:

    class Foo(object):
    
        @classmethod
        def __enter__(cls):
            print("__enter__")
    
        @classmethod
        def __exit__(cls, exc_type, exc_value, traceback):
            print("__exit__")
    
    with Foo: pass

However, in 2.7 and 3.2 I get:

    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    AttributeError: __exit__

Is this a regression or a deliberate change? Off the top of my head I
can't think that this pattern is particularly useful, but it seems
like something that ought to work.

Gavin.


From vs at it.uu.se  Thu Sep 22 06:25:30 2011
From: vs at it.uu.se (Virgil Stokes)
Date: Thu, 22 Sep 2011 12:25:30 +0200
Subject: Execute code after Shut Down command given --- How?
Message-ID: <4E7B0D1A.7040306@it.uu.se>

I would like to execute some Python code (popup message to be displayed) when 
Windows Vista/7 is shut down. That is, this code should execute after  "Shut 
Down" is given from the "Shut Down Windows" popup, but before the actual shut 
down sequence starts.

How to write Python code to accomplish this task?



From yasar11732 at gmail.com  Thu Sep 22 06:43:48 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 22 Sep 2011 13:43:48 +0300
Subject: httplib's HEAD request, and https protocol
Message-ID: <CAFEUn8agoT2pFrD62jNk64Jes7dLSQcyDpJm6_a14qkmpLaJog@mail.gmail.com>

Hi,

I wrote a function to get thorugh redirections and find a final page for a
given web-page. But following function gives maximum recursion error for any
https pages I tried. Do you know what might be the problem here?

def getHeadResponse(url,response_cache = {}):
    try:
        return response_cache[url]
    except KeyError:
        url = urlparse.urlparse(url)
        conn = httplib.HTTPConnection(url.netloc)
        try:
            conn.request("HEAD",url.path)
        except:
            # Anything can happen, this is SPARTA!
            return None
        response = conn.getresponse()
        response_cache[url.geturl()] = response
        return response

def getFinalUrl(url):
    "Navigates through redirections to get final url."

    response = getHeadResponse(url)
    try:
        if str(response.status).startswith("3"):
            return getFinalUrl(response.getheader("location"))
    except AttributeError:
        pass
    return url
-- 
http://yasar.serveblog.net/
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From shilparani9030 at gmail.com  Thu Sep 22 06:48:47 2011
From: shilparani9030 at gmail.com (SHILPA)
Date: Thu, 22 Sep 2011 03:48:47 -0700 (PDT)
Subject: TOP 15 HOT BOLLYWOOD KISSES
Message-ID: <c69c795f-8575-4ee9-a963-1ce7106dcaa5@s20g2000yql.googlegroups.com>


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From steve+comp.lang.python at pearwood.info  Thu Sep 22 07:07:31 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 22 Sep 2011 21:07:31 +1000
Subject: Execute code after Shut Down command given --- How?
References: <mailman.1363.1316688610.27778.python-list@python.org>
Message-ID: <4e7b16f4$0$29979$c3e8da3$5496439d@news.astraweb.com>

Virgil Stokes wrote:

> I would like to execute some Python code (popup message to be displayed)
> when
> Windows Vista/7 is shut down. That is, this code should execute after 
> "Shut Down" is given from the "Shut Down Windows" popup, but before the
> actual shut down sequence starts.
> 
> How to write Python code to accomplish this task?


Exactly the same way you would write it in any other language.

This is not a Python question. It is a Windows question: "How do I execute
code after the user calls Shut Down Windows, but before the shut down
sequence starts?" Find out how to do that, and then do it using Python
instead of another language.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep 22 07:09:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 22 Sep 2011 21:09:00 +1000
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<87wrd0286o.fsf@benfinney.id.au>
Message-ID: <4e7b174c$0$29979$c3e8da3$5496439d@news.astraweb.com>

Ben Finney wrote:

> Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:
> 
>> I don't understand why some environment variables are not visible from
>> Python.
> 
> Not all variables are environment variables. Variables only become
> environment variables if exported to the environment; the ?export?
> command is one way to do that.

I see. Thank you to everyone who answered.


-- 
Steven



From joni8135 at gmail.com  Thu Sep 22 07:16:34 2011
From: joni8135 at gmail.com (joni)
Date: Thu, 22 Sep 2011 04:16:34 -0700 (PDT)
Subject: Negativ nearest interger?
Message-ID: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>

Have a simple question in the Integer calculator in Python 2.65 and
also 2.7..

The consol showing:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.

>>> 7.0/3  #fist to show floiting-point calculation
2.3333333333333335
>>> -7.0/3
-2.3333333333333335
>>> -7/-3 #Rounding to nearest interger.
2
>>> 7/3
2
>>> 7/-3  #Now to the problem with interger rounding with negative anwser.
-3
>>> -7/3
-3
>>>

-3 are more wrong than -2. Negativ number seems not to round to
nearest interger, but the integer UNDER the anwser!! Or?

Why?



From yasar11732 at gmail.com  Thu Sep 22 07:42:12 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 22 Sep 2011 14:42:12 +0300
Subject: httplib's HEAD request, and https protocol
In-Reply-To: <CAFEUn8agoT2pFrD62jNk64Jes7dLSQcyDpJm6_a14qkmpLaJog@mail.gmail.com>
References: <CAFEUn8agoT2pFrD62jNk64Jes7dLSQcyDpJm6_a14qkmpLaJog@mail.gmail.com>
Message-ID: <CAFEUn8bpHKPHA0ar-b6XwE0v182PCwFQV4C-zKSiSpi_WepASA@mail.gmail.com>

Ok, nevermind. Appereantly there is such a thing as HTTPSConnection. I
thought httplib auto-handled https connections..

22 Eyl?l 2011 13:43 tarihinde Ya?ar Arabac? <yasar11732 at gmail.com> yazd?:

> Hi,
>
> I wrote a function to get thorugh redirections and find a final page for a
> given web-page. But following function gives maximum recursion error for any
> https pages I tried. Do you know what might be the problem here?
>
> def getHeadResponse(url,response_cache = {}):
>     try:
>         return response_cache[url]
>     except KeyError:
>         url = urlparse.urlparse(url)
>         conn = httplib.HTTPConnection(url.netloc)
>         try:
>             conn.request("HEAD",url.path)
>         except:
>             # Anything can happen, this is SPARTA!
>             return None
>         response = conn.getresponse()
>         response_cache[url.geturl()] = response
>         return response
>
> def getFinalUrl(url):
>     "Navigates through redirections to get final url."
>
>     response = getHeadResponse(url)
>     try:
>         if str(response.status).startswith("3"):
>             return getFinalUrl(response.getheader("location"))
>     except AttributeError:
>         pass
>     return url
> --
> http://yasar.serveblog.net/
>
>


-- 
http://yasar.serveblog.net/
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From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 07:43:52 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 13:43:52 +0200
Subject: Environment variables not visible from Python
In-Reply-To: <87wrd0286o.fsf@benfinney.id.au>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<87wrd0286o.fsf@benfinney.id.au>
Message-ID: <j5f71t$92c$1@r03.glglgl.eu>

Am 22.09.2011 12:16 schrieb Ben Finney:
> --
>   \       ?As far as the laws of mathematics refer to reality, they are |
>    `\    not certain, and as far as they are certain, they do not refer |
> _o__)                              to reality.? ?Albert Einstein, 1983 |
> Ben Finney

So, he said what in 1983? Wow.



From jpiitula at ling.helsinki.fi  Thu Sep 22 07:44:15 2011
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 22 Sep 2011 14:44:15 +0300
Subject: Negativ nearest interger?
References: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>
Message-ID: <qot7h50vm28.fsf@ruuvi.it.helsinki.fi>

joni writes:

> Have a simple question in the Integer calculator in Python 2.65 and
> also 2.7..
> 
> The consol showing:
> 
> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
...
> >>> -7/3
> -3
> >>>
> 
> -3 are more wrong than -2. Negativ number seems not to round to
> nearest interger, but the integer UNDER the anwser!! Or?
> 
> Why?

It simply does not round to the nearest integer. It floors. This has
nicer mathematical properties. In particular, it allows the remainder
(notated as "per cent") operation (n % m) to return a number that
differs from n by a multiple of m ("is congruent to n modulo m").
These two operations go together.


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 07:47:15 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 13:47:15 +0200
Subject: Context manager with class methods
In-Reply-To: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
Message-ID: <j5f789$95i$1@r03.glglgl.eu>

Am 22.09.2011 12:21 schrieb Gavin Panella:
> Hi,
>
> On Python 2.6 and 3.1 the following code works fine:
>
>      class Foo(object):
>
>          @classmethod
>          def __enter__(cls):
>              print("__enter__")
>
>          @classmethod
>          def __exit__(cls, exc_type, exc_value, traceback):
>              print("__exit__")
>
>      with Foo: pass
>
> However, in 2.7 and 3.2 I get:
>
>      Traceback (most recent call last):
>        File "<stdin>", line 1, in<module>
>      AttributeError: __exit__

Same here.

But

     with Foo(): pass

works, and that is more important and more logical.


Thomas


From ben+python at benfinney.id.au  Thu Sep 22 08:26:15 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 22 Sep 2011 22:26:15 +1000
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<87wrd0286o.fsf@benfinney.id.au> <j5f71t$92c$1@r03.glglgl.eu>
Message-ID: <87r538226w.fsf@benfinney.id.au>

Thomas Rachel writes:

> Am 22.09.2011 12:16 schrieb Ben Finney:
> > --
> >   \       ?As far as the laws of mathematics refer to reality, they are |
> >    `\    not certain, and as far as they are certain, they do not refer |
> > _o__)                              to reality.? ?Albert Einstein, 1983 |
> > Ben Finney
>
> So, he said what in 1983? Wow.

Or at least, in a work of his published in 1983: ?Sidelights on
Relativity?. According to Wikiquote, anyway
<URL:https://secure.wikimedia.org/wikiquote/en/wiki/Albert_Einstein>.

-- 
 \      ?[Entrenched media corporations will] maintain the status quo, |
  `\       or die trying. Either is better than actually WORKING for a |
_o__)                  living.? ?ringsnake.livejournal.com, 2007-11-12 |
Ben Finney


From mwilson at the-wire.com  Thu Sep 22 08:45:18 2011
From: mwilson at the-wire.com (Mel)
Date: Thu, 22 Sep 2011 08:45:18 -0400
Subject: Context manager with class methods
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
Message-ID: <j5faks$egq$1@speranza.aioe.org>

Gavin Panella wrote:

> Hi,
> 
> On Python 2.6 and 3.1 the following code works fine:
> 
>     class Foo(object):
>     
>         @classmethod
>         def __enter__(cls):
>             print("__enter__")
>     
>         @classmethod
>         def __exit__(cls, exc_type, exc_value, traceback):
>             print("__exit__")
>     
>     with Foo: pass
> 
> However, in 2.7 and 3.2 I get:
> 
>     Traceback (most recent call last):
>       File "<stdin>", line 1, in <module>
>     AttributeError: __exit__
> 
> Is this a regression or a deliberate change? Off the top of my head I
> can't think that this pattern is particularly useful, but it seems
> like something that ought to work.

This seems to work:



class MetaWith (type):
    @classmethod
    def __enter__(cls):
        print("__enter__")

    @classmethod
    def __exit__(cls, exc_type, exc_value, traceback):
        print("__exit__")

class With (object):
    __metaclass__ = MetaWith
    
with With:
    pass
    


	Mel.	



From mwilson at the-wire.com  Thu Sep 22 08:53:21 2011
From: mwilson at the-wire.com (Mel)
Date: Thu, 22 Sep 2011 08:53:21 -0400
Subject: Context manager with class methods
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
	<j5faks$egq$1@speranza.aioe.org>
Message-ID: <j5fb3v$fup$1@speranza.aioe.org>

Mel wrote:
> This seems to work:
> 
> 
> 
> class MetaWith (type):
>     @classmethod
>     def __enter__(cls):
>         print("__enter__")
> 
>     @classmethod
>     def __exit__(cls, exc_type, exc_value, traceback):
>         print("__exit__")
> 
> class With (object):
>     __metaclass__ = MetaWith
>     
> with With:
>     pass

It seems to work equally well without the `@classmethod`s

	Mel.



From steve+comp.lang.python at pearwood.info  Thu Sep 22 08:58:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 22 Sep 2011 22:58:00 +1000
Subject: python install on locked down windows box?
References: <mailman.1357.1316683648.27778.python-list@python.org>
Message-ID: <4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>

Chris Withers wrote:

> Hi All,
> 
> Is there a way to install python on a locked down Windows desktop?
> (ie: no compilers, no admin rights, etc)

(1) Bribe or blackmail the fascist system administrator.

(2) Hack into the system with any of dozens of unpatched vulnerabilities
that will give you admin rights.

(3) Sneak into the office at 3 in the morning and replace the desktop with
an identical machine which you have admin rights to.

(4) Guess the admin password -- it's not hard, most fascist system
administrators can't remember words with more than four letters, so the
password is probably something like "passw" or, if he's being especially
cunning, "drows".

(5) "Accidentally" install Linux on the machine and use that instead.

(6) Take hostages.

(7) If all else fails, as an absolute last resort, simply run the Windows
installer as a regular, unprivileged user, after selecting the option for a
Non-Admin Install under Advanced Options first. You could also try the
ActivePython installer.

http://www.richarddooling.com/index.php/2006/03/14/python-on-xp-7-minutes-to-hello-world/
http://diveintopython.org/installing_python/windows.html



-- 
Steven



From joni8135 at gmail.com  Thu Sep 22 10:13:54 2011
From: joni8135 at gmail.com (joni)
Date: Thu, 22 Sep 2011 07:13:54 -0700 (PDT)
Subject: Negativ nearest interger?
References: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>
	<qot7h50vm28.fsf@ruuvi.it.helsinki.fi>
Message-ID: <c894dfd7-1189-4ffa-a8c5-97d27de7572e@x1g2000yqd.googlegroups.com>

On Sep 22, 1:44?pm, Jussi Piitulainen <jpiit... at ling.helsinki.fi>
wrote:
> joni writes:
> > Have a simple question in the Integer calculator in Python 2.65 and
> > also 2.7..
>
> > The consol showing:
>
> > Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
> ...
> > >>> -7/3
> > -3
>
> > -3 are more wrong than -2. Negativ number seems not to round to
> > nearest interger, but the integer UNDER the anwser!! Or?
>
> > Why?
>
> It simply does not round to the nearest integer. It floors. This has
> nicer mathematical properties. In particular, it allows the remainder
> (notated as "per cent") operation (n % m) to return a number that
> differs from n by a multiple of m ("is congruent to n modulo m").
> These two operations go together.

Thanx. See if I can understand it.... /Cheers


From ian at excess.org  Thu Sep 22 11:05:00 2011
From: ian at excess.org (Ian Ward)
Date: Thu, 22 Sep 2011 11:05:00 -0400
Subject: ANN: Urwid 1.0.0 - Console UI Library
Message-ID: <4E7B4E9C.7060704@excess.org>

Announcing Urwid 1.0.0
----------------------

Urwid home page:
  http://excess.org/urwid/

Manual:
  http://excess.org/urwid/wiki/UrwidManual

Tarball:
  http://excess.org/urwid/urwid-1.0.0.tar.gz


About this release:
===================

This is a major feature release for Urwid:

It's the first official release that has support for Python 3.

There's a new experimental Terminal widget so you can terminal while you
terminal or write a screen-clone.

There's a new example showing how to serve Urwid interfaces to many
users simultaneously over ssh with Twisted.

There are new classes to help with creating dynamic tree views of
anything you have that's tree-like.

There are new widgets for working with pop-ups so you can now have all
the menu bars, drop-downs and combo-boxes you can write.

The old requirement to sprinkle draw_screen() calls around your
callbacks is gone.  Urwid now updates the screen automatically after
everything else is done.

There's a new simple MainLoop method for catching updates from other
threads and processes.  No need to manually fumble with os.pipe() and
event loops.

And lots more...

Happy 1.0 Urwid!  It's been a great nearly-seven years since our first
release.  Huge thanks to everyone that's contributed code, docs, bug
reports and help on the mailing list and IRC.


New in this release:
====================

  * New support for Python 3.2 from the same 2.x code base,
    requires distribute instead of setuptools (by Kirk McDonald,
    Wendell, Marien Zwart) everything except TwistedEventLoop and
    GLibEventLoop is supported

  * New experimental Terminal widget with xterm emulation and
    terminal.py example program (by aszlig)

  * Edit widget now supports a mask (for passwords), has a
    insert_text_result() method for full-field validation and
    normalizes input text to Unicode or bytes based on the caption
    type used

  * New TreeWidget, TreeNode, ParentNode, TreeWalker
    and TreeListBox classes for lazy expanding/collapsing tree
    views factored out of browse.py example program, with new
    treesample.py example program (by Rob Lanphier)

  * MainLoop now calls draw_screen() just before going idle, so extra
    calls to draw_screen() in user code may now be removed

  * New MainLoop.watch_pipe() method for subprocess or threaded
    communication with the process/thread updating the UI, and new
    subproc.py example demonstrating its use

  * New PopUpLauncher and PopUpTarget widgets and MainLoop option
    for creating pop-ups and drop-downs, and new pop_up.py example
    program

  * New twisted_serve_ssh.py example (by Ali Afshar) that serves
    multiple displays over ssh from the same application using
    Twisted and the TwistedEventLoop

  * ListBox now includes a get_cursor_coords() method, allowing
    nested ListBox widgets

  * Columns widget contents may now be marked to always be treated
    as flow widgets for mixing flow and box widgets more easily

  * New lcd_display module with support for CF635 USB LCD panel and
    lcd_cf635.py example program with menus, slider controls and a
    custom font

  * Shared command_map instance is now stored as Widget._command_map
    class attribute and may be overridden in subclasses or individual
    widgets for more control over special keystrokes

  * Overlay widget parameters may now be adjusted after creation with
    set_overlay_parameters() method

  * New WidgetPlaceholder widget useful for swapping widgets without
    having to manipulate a container widget's contents

  * LineBox widgets may now include title text

  * ProgressBar text content and alignment may now be overridden

  * Use reactor.stop() in TwistedEventLoop and document that Twisted's
    reactor is not designed to be stopped then restarted

  * curses_display now supports AttrSpec and external event loops
    (Twisted or GLib) just like raw_display

  * raw_display and curses_display now support the IBMPC character
    set (currently only used by Terminal widget)

  * Fix for a gpm_mev bug preventing user input when on the console

  * Fix for leaks of None objects in str_util extension

  * Fix for WidgetWrap and AttrMap not working with fixed widgets

  * Fix for a lock up when attempting to wrap text containing wide
    characters into a single character column


About Urwid
===========

Urwid is a console UI library for Python. It features fluid interface
resizing, Unicode support, multiple text layouts, simple attribute
markup, powerful scrolling list boxes and flexible interface design.

Urwid is released under the GNU LGPL.


From python at mrabarnett.plus.com  Thu Sep 22 11:19:04 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 22 Sep 2011 16:19:04 +0100
Subject: static statements and thread safety
In-Reply-To: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
Message-ID: <4E7B51E8.10200@mrabarnett.plus.com>

On 22/09/2011 08:45, Eric Snow wrote:
> A recent thread on the python-ideas list got me thinking about the
> possibility of a static statement (akin to global and nonlocal).  I am
> wondering if an implementation would have to address thread safety
> concerns.
>
> I would expect that static variables would work pretty much the same
> way as default arguments, with a list of names on the code object and
> a list of values on the function object.  And I would guess that the
> values from the static variables would get updated on the function
> object at the end of the call.  If multiple threads are executing the
> function at the same time won't there be a problem with that
> end-of-call update?
>
It's no different from using a global, except that it's not in the
global (module) namespace, but attached to a function object.

> -eric
>
>
> p.s. It probably shows that I haven't done a lot of thread-related
> programming, so perhaps this is not a hard question.


From atherun at gmail.com  Thu Sep 22 11:55:40 2011
From: atherun at gmail.com (Atherun)
Date: Thu, 22 Sep 2011 08:55:40 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
Message-ID: <bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>

On Sep 22, 12:24?am, Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-
a470-7603bd3aa... at spamschutz.glglgl.de> wrote:
> Am 22.09.2011 05:42 schrieb Atherun:
>
> > I'm pretty sure thats the problem, this is a generic catch all
> > function for running subprocesses. ?It can be anything to a simple
> > command to a complex command with a ton of output. ?I'm looking for a
> > better solution to handle the case of running subprocesses that have
> > an undetermined amount of output.
>
> Just handle process.stdout/stderr by yourself - read it out until EOF
> and then wait() for the process.
>
> Thomas

Thats what confuses me though, the documentation says
process.stdout.read()/stderr.read() can deadlock and apparently so can
communicate, how do you read the stdout/stderr on yourself if its
documented using them can cause a deadlock?


From navkirat.py at gmail.com  Thu Sep 22 12:00:18 2011
From: navkirat.py at gmail.com (Navkirat Singh)
Date: Thu, 22 Sep 2011 21:30:18 +0530
Subject: Decision on python technologies
Message-ID: <CAKzQzuvjDYeRLRfGOwBeo+9iNZLh8AN401ripZRtaqdbDesd7g@mail.gmail.com>

Hi Guys,

I have been a python developer for a bit now and for the life of me I am not
being able to decide something. I am trying to develop a web based
application in python. I am torn between using python 2 or 3. All the good
frameworks are still in 2.x. Now, cherrypy, sqlalchemy and jinja2 support
python 3. But do I really want to do all the boilerplate work again? I have
this strong urge to use python 3 and call it my indecisiveness , I am
somehow not wanting to use 2.x, though it has everything I need to build my
app. Hence, I finally decided to turn to the community for helping me make
this decision.

Please help.

Regards,
Nav
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From miki.tebeka at gmail.com  Thu Sep 22 12:28:52 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 22 Sep 2011 09:28:52 -0700 (PDT)
Subject: [ANNC] pynguin-0.12  (fixes problems running on Windows)
In-Reply-To: <mailman.1337.1316655424.27778.python-list@python.org>
References: <mailman.1337.1316655424.27778.python-list@python.org>
Message-ID: <19309769.959.1316708932280.JavaMail.geo-discussion-forums@prdy8>

Thank you! My kids *love* it.


From miki.tebeka at gmail.com  Thu Sep 22 12:28:52 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 22 Sep 2011 09:28:52 -0700 (PDT)
Subject: [ANNC] pynguin-0.12  (fixes problems running on Windows)
In-Reply-To: <mailman.1337.1316655424.27778.python-list@python.org>
References: <mailman.1337.1316655424.27778.python-list@python.org>
Message-ID: <19309769.959.1316708932280.JavaMail.geo-discussion-forums@prdy8>

Thank you! My kids *love* it.


From ppearson at nowhere.invalid  Thu Sep 22 12:51:39 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 22 Sep 2011 16:51:39 GMT
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<j5enmt$uva$1@r03.glglgl.eu>
Message-ID: <9e17crFamfU1@mid.individual.net>

On Thu, 22 Sep 2011 09:21:59 +0200, Thomas Rachel wrote:
[snip]
> $ python -c 'import os; print "\n".join(sorted("%s=%s" % (k,v) for k,v 
> in os.environ.iteritems()))' | diff -u - <(env|LANG=C sort)

[standing ovation]

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


From rosuav at gmail.com  Thu Sep 22 13:39:54 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 23 Sep 2011 03:39:54 +1000
Subject: random.randint() slow, esp in Python 3
Message-ID: <CAPTjJmo5W_x6C9-vQ-BK9=q7MNQK7PXiMPqQMTxT_5JLeOmdMQ@mail.gmail.com>

The standard library function random.randint() seems to be quite slow
compared to random.random(), and worse in Python 3 than Python 2
(specifically that's 3.3a0 latest from Mercurial, and 2.6.6 that came
default on my Ubuntu install).

My test involves building a list of one million random integers
between 0 and ten million (for tinkering with sorting algorithms),
using a list comprehension:

import random
import time
sz=1000000
start=time.time()
a=[random.randint(0,sz*10-1) for i in range(sz)]
print("Time taken: ",time.time()-start)

The code works fine in either version of Python (although the display
looks a bit odd in Py2). But on my test system, it takes about 5
seconds to run in Py2, and about 10 seconds for Py3. (The obvious
optimization of breaking sz*10-1 out and storing it in a variable
improves both times, but leaves the dramatic difference.)

Replacing randint with random():
a=[int(random.random()*top) for i in range(sz)]
cuts the times down to about 1.5 secs for Py2, and 1.8 secs for Py3.

I suspect that the version difference is (at least in part) due to the
merging of the 'int' and 'long' types in Py3. This is supported
experimentally by rerunning the second list comp but using int() in
place of long() - the time increases to about 1.7-1.8 secs, matching
Py3.

But this still doesn't explain why randint() is so much slower. In
theory, randint() should be doing basically the same thing that I've
done here (multiply by the top value, truncate the decimal), only it's
in C instead of Python - if anything, it should be faster than doing
it manually, not slower.

A minor point of curiosity, nothing more... but, I think, a fascinating one.

ChrisA


From nobody at nowhere.com  Thu Sep 22 13:44:09 2011
From: nobody at nowhere.com (Nobody)
Date: Thu, 22 Sep 2011 18:44:09 +0100
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
Message-ID: <pan.2011.09.22.17.44.08.952000@nowhere.com>

On Thu, 22 Sep 2011 08:55:40 -0700, Atherun wrote:

>> Just handle process.stdout/stderr by yourself - read it out until EOF
>> and then wait() for the process.
> 
> Thats what confuses me though, the documentation says
> process.stdout.read()/stderr.read() can deadlock and apparently so can
> communicate, how do you read the stdout/stderr on yourself if its
> documented using them can cause a deadlock?

If you try to read/write two or more of stdin/stdout/stderr via the
"naive" approach, you run the risk of the child process writing more than
a pipe's worth of data to one stream (and thus blocking) while the
parent is performing a blocking read/write on another stream, resulting in
deadlock.

The .communicate() method avoids the deadlock by either:

1. On Unix, using non-blocking I/O and select(), or
2. On Windows, creating a separate thread for each stream.

Either way, the result is that it can always read/write whichever
streams are ready, so the child will never block indefinitely while
waiting for the parent.

If .communicate() is blocking indefinitely, it suggests that the child
process never terminates. There are many reasons why this might happen,
and most of them depend upon exactly what the child process is doing.

I suggest obtaining a copy of Process Explorer, and using it to
investigate the state of both processes (but especially the child) at the
point that the "deadlock" seems to occur.



From steve+comp.lang.python at pearwood.info  Thu Sep 22 14:14:16 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 23 Sep 2011 04:14:16 +1000
Subject: random.randint() slow, esp in Python 3
References: <mailman.1371.1316713198.27778.python-list@python.org>
Message-ID: <4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> The standard library function random.randint() seems to be quite slow
> compared to random.random(), and worse in Python 3 than Python 2
[...]
> But this still doesn't explain why randint() is so much slower. In
> theory, randint() should be doing basically the same thing that I've
> done here (multiply by the top value, truncate the decimal), only it's
> in C instead of Python - if anything, it should be faster than doing
> it manually, not slower.

What makes you think it's in C? I don't have Python 3.3a, but in 3.2 the
random module is mostly Python. There is an import of _random, which
presumably is in C, but it doesn't have a randint method:

>>> import _random
>>> _random.Random.randint
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object '_random.Random' has no attribute 'randint'


I'm not seeing any significant difference in speed between 2.6 and 3.2:

[steve at sylar ~]$ python2.6 -m timeit -s "from random import
randint" "randint(0, 1000000)"
100000 loops, best of 3: 4.29 usec per loop

[steve at sylar ~]$ python3.2 -m timeit -s "from random import
randint" "randint(0, 1000000)"
100000 loops, best of 3: 4.98 usec per loop


(The times are quite variable: the above are the best of three attempts.)



-- 
Steven



From emile at fenx.com  Thu Sep 22 14:16:05 2011
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 22 Sep 2011 11:16:05 -0700
Subject: Decision on python technologies
In-Reply-To: <CAKzQzuvjDYeRLRfGOwBeo+9iNZLh8AN401ripZRtaqdbDesd7g@mail.gmail.com>
References: <CAKzQzuvjDYeRLRfGOwBeo+9iNZLh8AN401ripZRtaqdbDesd7g@mail.gmail.com>
Message-ID: <j5fttm$7bl$1@dough.gmane.org>

On 9/22/2011 9:00 AM Navkirat Singh said...
> Hi Guys,
>
> I have been a python developer for a bit now and for the life of me I am
> not being able to decide something. I am trying to develop a web based
> application in python. I am torn between using python 2 or 3. All the
> good frameworks are still in 2.x. Now, cherrypy, sqlalchemy and jinja2
> support python 3. But do I really want to do all the boilerplate work
> again? I have this strong urge to use python 3 and call it my
> indecisiveness , I am somehow not wanting to use 2.x, though it has
> everything I need to build my app. Hence, I finally decided to turn to
> the community for helping me make this decision.
>

I'd consider the development timeframe -- if it'll still be under 
development within the timeframe of migration and availability of 
desired tools then I'd start with 3 and focus on those parts that can be 
worked on.  If your development timeframe is measured in weeks instead 
of quarters or years, I'd just get it done with 2.

Emile





From atherun at gmail.com  Thu Sep 22 14:19:28 2011
From: atherun at gmail.com (Atherun)
Date: Thu, 22 Sep 2011 11:19:28 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
Message-ID: <ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>

On Sep 22, 10:44?am, Nobody <nob... at nowhere.com> wrote:
> On Thu, 22 Sep 2011 08:55:40 -0700, Atherun wrote:
> >> Just handle process.stdout/stderr by yourself - read it out until EOF
> >> and then wait() for the process.
>
> > Thats what confuses me though, the documentation says
> > process.stdout.read()/stderr.read() can deadlock and apparently so can
> > communicate, how do you read the stdout/stderr on yourself if its
> > documented using them can cause a deadlock?
>
> If you try to read/write two or more of stdin/stdout/stderr via the
> "naive" approach, you run the risk of the child process writing more than
> a pipe's worth of data to one stream (and thus blocking) while the
> parent is performing a blocking read/write on another stream, resulting in
> deadlock.
>
> The .communicate() method avoids the deadlock by either:
>
> 1. On Unix, using non-blocking I/O and select(), or
> 2. On Windows, creating a separate thread for each stream.
>
> Either way, the result is that it can always read/write whichever
> streams are ready, so the child will never block indefinitely while
> waiting for the parent.
>
> If .communicate() is blocking indefinitely, it suggests that the child
> process never terminates. There are many reasons why this might happen,
> and most of them depend upon exactly what the child process is doing.
>
> I suggest obtaining a copy of Process Explorer, and using it to
> investigate the state of both processes (but especially the child) at the
> point that the "deadlock" seems to occur.

In the one case I can easily reproduce, its in a p4.exe call that I'm
making both python and p4.exe have nearly the same stack for their
threads:
python:

ntoskrnl.exe!memset+0x64a
ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!__misaligned_access+0xba4
ntoskrnl.exe!__misaligned_access+0x1821
ntoskrnl.exe!KeWaitForMultipleObjects+0xf5d
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!NtWaitForSingleObject+0xde
ntoskrnl.exe!KeSynchronizeExecution+0x3a43
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x6c0
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x4a8
wow64.dll!Wow64SystemServiceEx+0x1ce
wow64.dll!Wow64LdrpInitialize+0x429
ntdll.dll!RtlUniform+0x6e6
ntdll.dll!RtlCreateTagHeap+0xa7
ntdll.dll!LdrInitializeThunk+0xe
ntdll.dll!ZwWaitForSingleObject+0x15
kernel32.dll!WaitForSingleObjectEx+0x43
kernel32.dll!WaitForSingleObject+0x12
python26.dll!_Py_svnversion+0xcf8


p4:

ntoskrnl.exe!memset+0x64a
ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
ntoskrnl.exe!KeWaitForSingleObject+0x19f
ntoskrnl.exe!_misaligned_access+0xba4
ntoskrnl.exe!_misaligned_access+0x1821
ntoskrnl.exe!KeWaitForMultipleObjects+0xf5d
ntoskrnl.exe!KeWaitForSingleObject+0x19f
ntoskrnl.exe!NtCreateFile+0x4c9
ntoskrnl.exe!NtWriteFile+0x7e3
ntoskrnl.exe!KeSynchronizeExecution+0x3a43
ntdll.dll!ZwWriteFile+0xa
KERNELBASE.dll!WriteFile+0x7b
kernel32.dll!WriteFile+0x36
p4.exe+0x42d4b
p4.exe+0x42ed8


To me it looks like they're both waiting on each other.



From mattj.morrison at gmail.com  Thu Sep 22 17:14:39 2011
From: mattj.morrison at gmail.com (Matt)
Date: Thu, 22 Sep 2011 14:14:39 -0700 (PDT)
Subject: Python Mixins
Message-ID: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>

I'm curious about what people's opinions are about using mixins in
Python. I really like, for example, the way that class based views
were implemented in Django 1.3 using mixins. It makes everything
extremely customizable and reusable. I think this is a very good
practice to follow, however, in Python mixins are achieved by using
(or perhaps misusing) inheritance and often multiple inheritance.

Inheritance is a very powerful tool, and multiple inheritance is an
even more powerful tool. These tools have their uses, but I feel like
"mixing in" functionality is not one of them. There are much different
reasons and uses for inheriting functionality from a parent and mixing
in functionality from elsewhere.

As a person, you learn certain things from your parents, you learn
other things from your peers all of those things put together becomes
you. Your peers are not your parents, that would not be possible. You
have completely different DNA and come from a completely different
place.

In terms of code, lets say we have the following classes:

class Animal
class Yamlafiable
class Cat(Animal, Yamlafiable)
class Dog(Animal, Yamlafiable)

I've got an Animal that does animal things, a Cat that does cat things
and a Dog that does dog things. I've also got a Yamlafiable class that
does something clever to generically convert an object into Yaml in
some way. Looking at these classes I can see that a Cat is an Animal,
a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
Yamlafiable? and a Cat is a Yamlafiable? Is that really true? If my
objects are categorized correctly, in the correct inheritance
hierarchy shouldn't that make more sense? Cats and Dogs aren't
Yamlafiable, that doesn't define what they are, rather it defines
something that they can do because of things that they picked up from
their friend the Yamlafile.

This is just a ridiculous example, but I think it is valid to say that
these things shouldn't be limited to inherit functionality only from
their parents, that they can pick other things up along the way as
well. Which is easy to do, right?

Dog.something_new = something_new

(I wish my stupid dog would learn that easily)

Ideally, what I would like to see is something like Ruby's mixins. It
seems to me like Ruby developed this out of necessity due to the fact
that it does not support multiple inheritance, however I think the
implementation is much more pure than inheriting from things that
aren't your parents. (although having only a single parent doesn't
make much sense either, I believe there are very few actual documented
cases of that happening). Here is a Ruby snippet:

module ReusableStuff
    def one_thing
        "something cool"
    end
end
class MyClass < MyParent
    include ReusableStuff
end

x = MyClass.new
x.one_thing == "something cool"
MyClass.superclass == Object

So I'm inheriting from MyParent and mixing in additional functionality
from ReusableStuff without affecting who my Parents are. This, to me,
makes much more sense than using inheritance to just grab a piece of
functionality that I want to reuse. I wrote a class decorator for
Python that does something similar (https://gist.github.com/1233738)
here is a snippet from that:

class MyMixin(object):
    def one_thing(self):
        return "something cool"

@mixin(MyMixin)
class MyClass(object):
    pass

x = MyClass()
x.one_thing() == 'something cool'
x.__class__.__bases__ ==  (object,)

To me, this is much more concise. By looking at this I can tell what
MyClass IS, who it's parents are and what else it can do. I'm very
interested to know if there are others who feel as dirty as I do when
using inheritance for mixins or if there are other things that Python
developers are doing to mix in functionality without using inheritance
or if the general populous of the Python community disagrees with me
and thinks that this is a perfectly valid use of inheritance.

I look forward to hearing back.

Thanks,
Matthew J Morrison
www.mattjmorrison.com


P.S. - This is a good article about not using inheritance as a code
reuse tool: http://littletutorials.com/2008/06/23/inheritance-not-for-code-reuse/


From rantingrick at gmail.com  Thu Sep 22 17:44:03 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 22 Sep 2011 14:44:03 -0700 (PDT)
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <1b1998c1-150c-49d5-b42b-56fe117e7ad6@eb1g2000vbb.googlegroups.com>

On Sep 22, 4:14?pm, Matt <mattj.morri... at gmail.com> wrote:

> (although having only a single parent doesn't
> make much sense either, I believe there are very few actual documented
> cases of that happening).

There is nothing wrong with an object having only one parent. Most
times the reasons are for maintainability. I might have a TextEditor
that exposes all the generic functionality that are ubiquitous to text
editors and then a FancyTextEditor(TextEditor) that exposes
functionality that is unique to a confined set of text editing uses. A
silly example, but proves the point. Do not judge an object by the
number of prodigy.


From t at jollybox.de  Thu Sep 22 18:09:08 2011
From: t at jollybox.de (Thomas Jollans)
Date: Fri, 23 Sep 2011 00:09:08 +0200
Subject: Python Mixins
In-Reply-To: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <4E7BB204.90902@jollybox.de>

On 2011-09-22 23:14, Matt wrote:
> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins. It makes everything
> extremely customizable and reusable. I think this is a very good
> practice to follow, however, in Python mixins are achieved by using
> (or perhaps misusing) inheritance and often multiple inheritance.
> 
> Inheritance is a very powerful tool, and multiple inheritance is an
> even more powerful tool. These tools have their uses, but I feel like
> "mixing in" functionality is not one of them. There are much different
> reasons and uses for inheriting functionality from a parent and mixing
> in functionality from elsewhere.
> 
> As a person, you learn certain things from your parents, you learn
> other things from your peers all of those things put together becomes
> you. Your peers are not your parents, that would not be possible. You
> have completely different DNA and come from a completely different
> place.
> 
> In terms of code, lets say we have the following classes:
> 
> class Animal
> class Yamlafiable
> class Cat(Animal, Yamlafiable)
> class Dog(Animal, Yamlafiable)
> 

I think this is an excellent use of multiple inheritance. One could also
have a construction like this:

class Dog (Animal)
class YamlafialbleDog (Dog, Yamlafiable)

... which you may be more comfortable with. In you above example, yes, a
Dog object is a Yamlafiable object. If you need a Yamlafiable object,
you can use a Cat or Dog. That's what inheritance is about.

In Python or Ruby, this way of doing things is not all that different
from the one you present below. Here, it doesn't really matter. In
strictly typed languages, it makes a world of difference. What if you
don't care what kind of object you're dealing with, as long as it
supports the interface a certain mixin provides? In Python, true, duck
typing will do the trick. In C++, for example, where you could use the C
preprocessor to do something like Ruby mixins, multiple inheritance is a
lot more useful for mixing in something that has a public interface.

The Vala language, and, I suppose the GObject type system, actually
allows interfaces to act as mixins. This is really a more formalised way
of doing just this: using multiple inheritance (which, beyond
interfaces, Vala does not support) to mix in functionality.

Oh and your thing looks kind of neat.

Thomas

> I've got an Animal that does animal things, a Cat that does cat things
> and a Dog that does dog things. I've also got a Yamlafiable class that
> does something clever to generically convert an object into Yaml in
> some way. Looking at these classes I can see that a Cat is an Animal,
> a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
> Yamlafiable? and a Cat is a Yamlafiable? Is that really true? If my
> objects are categorized correctly, in the correct inheritance
> hierarchy shouldn't that make more sense? Cats and Dogs aren't
> Yamlafiable, that doesn't define what they are, rather it defines
> something that they can do because of things that they picked up from
> their friend the Yamlafile.
> 
> This is just a ridiculous example, but I think it is valid to say that
> these things shouldn't be limited to inherit functionality only from
> their parents, that they can pick other things up along the way as
> well. Which is easy to do, right?
> 
> Dog.something_new = something_new
> 
> (I wish my stupid dog would learn that easily)
> 
> Ideally, what I would like to see is something like Ruby's mixins. It
> seems to me like Ruby developed this out of necessity due to the fact
> that it does not support multiple inheritance, however I think the
> implementation is much more pure than inheriting from things that
> aren't your parents. (although having only a single parent doesn't
> make much sense either, I believe there are very few actual documented
> cases of that happening). Here is a Ruby snippet:
> 
> module ReusableStuff
>     def one_thing
>         "something cool"
>     end
> end
> class MyClass < MyParent
>     include ReusableStuff
> end
> 
> x = MyClass.new
> x.one_thing == "something cool"
> MyClass.superclass == Object
> 
> So I'm inheriting from MyParent and mixing in additional functionality
> from ReusableStuff without affecting who my Parents are. This, to me,
> makes much more sense than using inheritance to just grab a piece of
> functionality that I want to reuse. I wrote a class decorator for
> Python that does something similar (https://gist.github.com/1233738)
> here is a snippet from that:
> 
> class MyMixin(object):
>     def one_thing(self):
>         return "something cool"
> 
> @mixin(MyMixin)
> class MyClass(object):
>     pass
> 
> x = MyClass()
> x.one_thing() == 'something cool'
> x.__class__.__bases__ ==  (object,)
> 
> To me, this is much more concise. By looking at this I can tell what
> MyClass IS, who it's parents are and what else it can do. I'm very
> interested to know if there are others who feel as dirty as I do when
> using inheritance for mixins or if there are other things that Python
> developers are doing to mix in functionality without using inheritance
> or if the general populous of the Python community disagrees with me
> and thinks that this is a perfectly valid use of inheritance.
> 
> I look forward to hearing back.
> 
> Thanks,
> Matthew J Morrison
> www.mattjmorrison.com
> 
> 
> P.S. - This is a good article about not using inheritance as a code
> reuse tool: http://littletutorials.com/2008/06/23/inheritance-not-for-code-reuse/



From tjreedy at udel.edu  Thu Sep 22 18:56:54 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 22 Sep 2011 18:56:54 -0400
Subject: Context manager with class methods
In-Reply-To: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
Message-ID: <j5gefq$p0k$1@dough.gmane.org>

On 9/22/2011 6:21 AM, Gavin Panella wrote:

> On Python 2.6 and 3.1 the following code works fine:
>      class Foo(object):
>          @classmethod
>          def __enter__(cls):
>              print("__enter__")
>          @classmethod
>          def __exit__(cls, exc_type, exc_value, traceback):
>              print("__exit__")
>
>      with Foo: pass

This could be regarded as a bug, see below.

> However, in 2.7 and 3.2 I get:
>
>      Traceback (most recent call last):
>        File "<stdin>", line 1, in<module>
>      AttributeError: __exit__

type(Foo) == type and type has no such attribute.

Unless otherwise specified, 'method' typically means 'instance method'. 
In particular, the '__xxx__' special methods are (all?) (intended to be) 
instance methods, which is to say, functions that are attributes of an 
object's class. So it is normal to look for special methods on the class 
(and superclasses) of an object rather than starting with the object 
itself. For instance, when executing 'a+b', the interpreter never looks 
for __add__ as an attribute of a itself (in a.__dict__)
but starts the search looking for with type(a).__add__

> Is this a regression or a deliberate change? Off the top of my head I
> can't think that this pattern is particularly useful, but it seems
> like something that ought to work.

I suspect there was a deliberate change to correct an anomaly, though 
this might have been done as part of some other change. As Thomas noted, 
*instances* of Foo work and as Mei noted, making Foo an instance of a 
(meta)class with the needed methods also works.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Thu Sep 22 19:14:42 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 22 Sep 2011 19:14:42 -0400
Subject: Negativ nearest interger?
In-Reply-To: <qot7h50vm28.fsf@ruuvi.it.helsinki.fi>
References: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>
	<qot7h50vm28.fsf@ruuvi.it.helsinki.fi>
Message-ID: <j5gfh6$v6c$1@dough.gmane.org>

On 9/22/2011 7:44 AM, Jussi Piitulainen wrote:
> joni writes:

>> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
> ...
>>>>> -7/3
>> -3

In late Python 2 you *can* and in Python 3 you *must* use // rather than 
/ to get an int result.

>> -3 are more wrong than -2. Negativ number seems not to round to
>> nearest interger, but the integer UNDER the anwser!! Or?
>> Why?
>
> It simply does not round to the nearest integer. It floors. This has
> nicer mathematical properties. In particular, it allows the remainder
> (notated as "per cent") operation (n % m) to return a number that
> differs from n by a multiple of m ("is congruent to n modulo m").
> These two operations go together.

The Python doc set has a FAQ collection. I recommend you read the 
questions for those you might be interested in. In the Programming FAQ:

"Why does -22 // 10 return -3?

It?s primarily driven by the desire that i % j have the same sign as j. 
If you want that, and also want:

i == (i // j) * j + (i % j)
then integer division has to return the floor. C also requires that 
identity to hold, and then compilers that truncate i // j need to make i 
% j have the same sign as i.

There are few real use cases for i % j when j is negative. When j is 
positive, there are many, and in virtually all of them it?s more useful 
for i % j to be >= 0. If the clock says 10 now, what did it say 200 
hours ago? -190 % 12 == 2 is useful; -190 % 12 == -10 is a bug waiting 
to bite."





-- 
Terry Jan Reedy




From rosuav at gmail.com  Thu Sep 22 19:22:44 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 23 Sep 2011 09:22:44 +1000
Subject: random.randint() slow, esp in Python 3
In-Reply-To: <4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmp__Uz8CGEpb0wKDCseWVfk2o6AiUztof7LPJG5xKTdWg@mail.gmail.com>

On Fri, Sep 23, 2011 at 4:14 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> What makes you think it's in C? I don't have Python 3.3a, but in 3.2 the
> random module is mostly Python. There is an import of _random, which
> presumably is in C, but it doesn't have a randint method:

True. It seems to be defined in cpython/lib/random.py as a reference
to randrange, which does a pile of error checking and calls
_randbelow... which does a whole lot of work as well as calling
random(). Guess I should have checked the code before asking!

There's probably good reasons for using randint(), but if you just
want a pile of more-or-less random integers, int(random.random()*top)
is the best option.

> I'm not seeing any significant difference in speed between 2.6 and 3.2:
>
> [steve at sylar ~]$ python2.6 -m timeit -s "from random import
> randint" "randint(0, 1000000)"
> 100000 loops, best of 3: 4.29 usec per loop
>
> [steve at sylar ~]$ python3.2 -m timeit -s "from random import
> randint" "randint(0, 1000000)"
> 100000 loops, best of 3: 4.98 usec per loop

That might be getting lost in the noise. Try the list comp that I had
above and see if you can see a difference - or anything else that
calls randint that many times.

Performance-testing with a heapsort (and by the way, it's
_ridiculously_ slower implementing it in Python instead of just
calling a.sort(), but we all knew that already!) shows a similar
difference in performance. As far as I know, everything's identical
between the two (I use // division so there's no floating point
getting in the way, for instance), but what takes 90 seconds on Py2
takes 150 seconds on Py3. As with the randint test, I switched int()
to long() to test Py2, and that slowed it down a little, but still far
far below the Py3 time.

I've pasted the code I'm using here: http://pastebin.com/eQPHQhD0

Where's the dramatic performance difference? Or doesn't it matter,
since anything involving this sort of operation needs to be done in C
anyway?

ChrisA


From skippy.hammond at gmail.com  Thu Sep 22 19:47:12 2011
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 23 Sep 2011 09:47:12 +1000
Subject: PyEval_EvalCodeEx return value
In-Reply-To: <4E786C42.3050309@loskot.net>
References: <4E786C42.3050309@loskot.net>
Message-ID: <4E7BC900.9010103@gmail.com>

On 20/09/2011 8:34 PM, Mateusz Loskot wrote:
> Hi,
>
> I'm trying to dig out details about what exactly is the return
> value the of PyEval_EvalCodeEx function in Python 3.x
> The documentation is sparse, unfortunately.
>
> Perhaps I'm looking at wrong function.
> My aim is simple, I need to execute Python code using Python interpreter
> embedded in my C++ application.
> The Python code is a simple script that always returns single value.
> For example:
>
> #! /usr/bin/env python
> def foo(a, b):
> return a + b
> f = foo(2, 3)
>
> But, f can be of different type for different script: one returns
> numeric value, another returns a sequence, so the type is not
> possible to be determined in advance.
>
> I know how to capture Python stdout/stderr.
>
> I also know how to access the "f" attribute using
> PyObject_GetAttrString and then I can convert "f" value to C++ type
> depending on PyObject type.
>
> However, I guess there shall be a way to access "f" value
> directly from PyEval_EvalCode return object:
>
> PyObject* evalRet = ::PyEval_EvalCode(...);
>
> But, I can't find any details what the "evalRet" actually is.

Eval is to eval an expression.  If you simply eval the expression "f" in 
the context of the module you should get the result returned.  Obviously 
though it is designed to eval more complex expressions and in your 
specific example, doing the getattr thing will also work fine.

Mark


From jesus.ramirez.utexas at gmail.com  Thu Sep 22 20:36:45 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Thu, 22 Sep 2011 17:36:45 -0700 (PDT)
Subject: Python 2.5 zlib trouble
Message-ID: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>

Hello,

I am trying to deploy an app on google app engine using bottle, a
micro-framework, similar to flask. I am running on ubuntu which comes
with python 2.7 installed but GAE needs version 2.5, so I installed
2.5. I then realized I didn't use make altinstall so I may have a
default version problem now. But my real problem is that when I try to
use the gae server to test locally I get the following error:

Traceback (most recent call last):
  File "/opt/google/appengine/dev_appserver.py", line 77, in <module>
    run_file(__file__, globals())
  File "/opt/google/appengine/dev_appserver.py", line 73, in run_file
    execfile(script_path, globals_)
  File "/opt/google/appengine/google/appengine/tools/
dev_appserver_main.py", line 156, in <module>
    from google.appengine.tools import dev_appserver
  File "/opt/google/appengine/google/appengine/tools/
dev_appserver.py", line 94, in <module>
    import zlib
ImportError: No module named zlib



Can you help me with this?


From anacrolix at gmail.com  Fri Sep 23 01:44:25 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Fri, 23 Sep 2011 15:44:25 +1000
Subject: python install on locked down windows box?
In-Reply-To: <4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1357.1316683648.27778.python-list@python.org>
	<4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAB4yi1NYEBSoeLTsY-fDoXmbdjx7SEv6_G5CDtjBckMRRijiAA@mail.gmail.com>

5 is the best solution, followed by 2 and 3.
On Sep 22, 2011 11:02 PM, "Steven D&apos;Aprano" <
steve+comp.lang.python at pearwood.info> wrote:
> Chris Withers wrote:
>
>> Hi All,
>>
>> Is there a way to install python on a locked down Windows desktop?
>> (ie: no compilers, no admin rights, etc)
>
> (1) Bribe or blackmail the fascist system administrator.
>
> (2) Hack into the system with any of dozens of unpatched vulnerabilities
> that will give you admin rights.
>
> (3) Sneak into the office at 3 in the morning and replace the desktop with
> an identical machine which you have admin rights to.
>
> (4) Guess the admin password -- it's not hard, most fascist system
> administrators can't remember words with more than four letters, so the
> password is probably something like "passw" or, if he's being especially
> cunning, "drows".
>
> (5) "Accidentally" install Linux on the machine and use that instead.
>
> (6) Take hostages.
>
> (7) If all else fails, as an absolute last resort, simply run the Windows
> installer as a regular, unprivileged user, after selecting the option for
a
> Non-Admin Install under Advanced Options first. You could also try the
> ActivePython installer.
>
>
http://www.richarddooling.com/index.php/2006/03/14/python-on-xp-7-minutes-to-hello-world/
> http://diveintopython.org/installing_python/windows.html
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
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From nobody at nowhere.com  Fri Sep 23 01:59:12 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 23 Sep 2011 06:59:12 +0100
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
Message-ID: <pan.2011.09.23.05.59.12.10000@nowhere.com>

On Thu, 22 Sep 2011 11:19:28 -0700, Atherun wrote:

>> I suggest obtaining a copy of Process Explorer, and using it to
>> investigate the state of both processes (but especially the child) at the
>> point that the "deadlock" seems to occur.
> 
> In the one case I can easily reproduce, its in a p4.exe call that I'm
> making both python and p4.exe have nearly the same stack for their
> threads:
> python:

> kernel32.dll!WaitForSingleObject+0x12
> python26.dll!_Py_svnversion+0xcf8

I haven't a clue how this happens. _Py_svnversion just returns a string:

_Py_svnversion(void)
{
    /* the following string can be modified by subwcrev.exe */
    static const char svnversion[] = SVNVERSION;
    if (svnversion[0] != '$')
        return svnversion; /* it was interpolated, or passed on command line */
    return "Unversioned directory";
}

It doesn't even 


From rosuav at gmail.com  Fri Sep 23 03:08:39 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 23 Sep 2011 17:08:39 +1000
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <pan.2011.09.23.05.59.12.10000@nowhere.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
Message-ID: <CAPTjJmpOS11=q9S9FUT41bBeJ6vBc3dR14cyVgTpMyr9NV8_AQ@mail.gmail.com>

On Fri, Sep 23, 2011 at 3:59 PM, Nobody <nobody at nowhere.com> wrote:
> It doesn't even
>

You intrigue me, sir. Does it odd?

What is the remainder of this aborted sentence?

ChrisA


From chris at simplistix.co.uk  Fri Sep 23 03:46:41 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 23 Sep 2011 08:46:41 +0100
Subject: TestFixtures 2.0.0 Released!
Message-ID: <4E7C3961.8020107@simplistix.co.uk>

Hi All,

I'm happy to announce a new release major release of TestFixtures.
This release is 99% backwards compatible, but a lot has changed under 
the hood and there's some major new functionality, so thought it was 
time for a bump.

The big changes are:

- compare now uses a registry of comparers in the same way that
   unitest2's assertEquals does. You can register your own globally,
   register the default comparers for your own types and use a specific
   registry for a specific call to compare.

- The handling of timezones has been reworked in `test_datetime` again.
   (did anyone ever mention that timezones are hard ;-) )
   It feels more intuitive now, but it is backwards incompatible in
   the case where the `tzinfo` parameter to the `test_datetime`
   constructor was used.

   For details, read:

   http://packages.python.org/testfixtures/datetime.html#timezones

The full list of changes can be found here:

http://packages.python.org/testfixtures/changes.html

The package is on PyPI and a full list of all the links to docs, issue 
trackers and the like can be found here:

http://www.simplistix.co.uk/software/python/testfixtures

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
            - http://www.simplistix.co.uk


From steve+comp.lang.python at pearwood.info  Fri Sep 23 04:11:03 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 23 Sep 2011 18:11:03 +1000
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
Message-ID: <4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>

Jesramz wrote:

> Hello,
> 
> I am trying to deploy an app on google app engine using bottle, a
> micro-framework, similar to flask.
[...]
> ImportError: No module named zlib


What happens if you explicitly launch Python2.5 and then try to import zlib?



-- 
Steven



From andrea.crotti.0 at gmail.com  Fri Sep 23 05:12:10 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 10:12:10 +0100
Subject: extending class
Message-ID: <4E7C4D6A.8050107@gmail.com>

I wanted to add a couple of parameters to a class from a given library 
(paste-script), but without changing the original code.
So I thought, I create a wrapper class which adds what I need, and then 
dispatch all the calls to the super class.

My following attempt gives, however, a recursion error, but why?

class PSIVar(object):
     """Extend var implementation from the paste-script, to add the
     ability of correlating variables
 >>> v = var("name", "desc")
 >>> v.name == 'name'
     True
 >>> v1 = PSIVar(v)
 >>> v1.name == 'name'
     True
     """
     def __init__(self, first_var, other=None, fun=None):
         # this is of type defined there
         self.first_var = first_var
         if other is not None:
             self.other = other
             self.fun = fun
             assert callable(self.fun)

     # now try to dispatch every method call to the other class
     # must probably call the super class
     def __getattribute__(self, attr):
         return self.first_var.__getattribute__(attr)



From duncan.booth at invalid.invalid  Fri Sep 23 05:19:09 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 23 Sep 2011 09:19:09 GMT
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <Xns9F6968F29F9F1duncanbooth@127.0.0.1>

Matt <mattj.morrison at gmail.com> wrote:

> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins. It makes everything
> extremely customizable and reusable. I think this is a very good
> practice to follow, however, in Python mixins are achieved by using
> (or perhaps misusing) inheritance and often multiple inheritance.
> 

I think Mixins are great, in moderation, but wait until you have to debug 
code on an object with 70 base classes.

Reinout van Rees wrote a very insightful article recently about Django's 
use of multiple inheritance:

http://reinout.vanrees.org/weblog/2011/08/23/class-based-views.html

He points out the problems that arise from overuse of mixins; why Zope went 
through so much upheaval to get away from mixins everywhere and switched to 
a component architecture instead; and suggests that Django will do the same 
in a few years time.


-- 
Duncan Booth http://kupuguy.blogspot.com


From __peter__ at web.de  Fri Sep 23 05:31:30 2011
From: __peter__ at web.de (Peter Otten)
Date: Fri, 23 Sep 2011 11:31:30 +0200
Subject: extending class
References: <4E7C4D6A.8050107@gmail.com>
Message-ID: <j5hjlj$him$1@dough.gmane.org>

Andrea Crotti wrote:

> I wanted to add a couple of parameters to a class from a given library
> (paste-script), but without changing the original code.
> So I thought, I create a wrapper class which adds what I need, and then
> dispatch all the calls to the super class.
> 
> My following attempt gives, however, a recursion error, but why?

Inside __getattribute__() you ask for self.first_var which triggers another 
__getattribute__() call that once again trys to determine the first_var 
attribute before it returns...

Try using __getattr__() instead which is only triggered for non-existent 
attributes 

def __getattr__(self, name):
    return getattr(self.first_var, name)

or check for the attributes you don't want to delegate explicitly:

def __getattribute__(self, name):
    if name == "first_var":
        return super(PSIVar, self).__getattribute__(name)
    return getattr(self.first_var, name)

> class PSIVar(object):
>      """Extend var implementation from the paste-script, to add the
>      ability of correlating variables
>  >>> v = var("name", "desc")
>  >>> v.name == 'name'
>      True
>  >>> v1 = PSIVar(v)
>  >>> v1.name == 'name'
>      True
>      """
>      def __init__(self, first_var, other=None, fun=None):
>          # this is of type defined there
>          self.first_var = first_var
>          if other is not None:
>              self.other = other
>              self.fun = fun
>              assert callable(self.fun)
> 
>      # now try to dispatch every method call to the other class
>      # must probably call the super class
>      def __getattribute__(self, attr):
>          return self.first_var.__getattribute__(attr)




From andrea.crotti.0 at gmail.com  Fri Sep 23 05:35:49 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 10:35:49 +0100
Subject: extending class
In-Reply-To: <j5hjlj$him$1@dough.gmane.org>
References: <4E7C4D6A.8050107@gmail.com> <j5hjlj$him$1@dough.gmane.org>
Message-ID: <4E7C52F5.5060301@gmail.com>

On 09/23/2011 10:31 AM, Peter Otten wrote:
>
> Inside __getattribute__() you ask for self.first_var which triggers another
> __getattribute__() call that once again trys to determine the first_var
> attribute before it returns...
>
> Try using __getattr__() instead which is only triggered for non-existent
> attributes
>
> def __getattr__(self, name):
>      return getattr(self.first_var, name)
>
> or check for the attributes you don't want to delegate explicitly:
>
> def __getattribute__(self, name):
>      if name == "first_var":
>          return super(PSIVar, self).__getattribute__(name)
>

Right thanks a lot it works perfectly.
I don't like too much, however, to mess around in this way, maybe it's 
better if I just fork the project
and patch the original code.

In this way maybe I can also contribute to it with patches (if they are 
accepted)...


From mateusz at loskot.net  Fri Sep 23 05:54:43 2011
From: mateusz at loskot.net (Mateusz Loskot)
Date: Fri, 23 Sep 2011 10:54:43 +0100
Subject: PyEval_EvalCodeEx return value
In-Reply-To: <4E7BC900.9010103@gmail.com>
References: <4E786C42.3050309@loskot.net> <4E7BC900.9010103@gmail.com>
Message-ID: <4E7C5763.3060106@loskot.net>

On 23/09/11 00:47, Mark Hammond wrote:
> On 20/09/2011 8:34 PM, Mateusz Loskot wrote:
>>
>> I'm trying to dig out details about what exactly is the return
>> value the of PyEval_EvalCodeEx function in Python 3.x
>> The documentation is sparse, unfortunately.
>>
>> Perhaps I'm looking at wrong function.
>> My aim is simple, I need to execute Python code using Python interpreter
>> embedded in my C++ application.
>> The Python code is a simple script that always returns single value.
>> For example:
>>
>> #! /usr/bin/env python
>> def foo(a, b):
>> return a + b
>> f = foo(2, 3)
>>
>> But, f can be of different type for different script: one returns
>> numeric value, another returns a sequence, so the type is not
>> possible to be determined in advance.
>>
>> I know how to capture Python stdout/stderr.
>>
>> I also know how to access the "f" attribute using
>> PyObject_GetAttrString and then I can convert "f" value to C++ type
>> depending on PyObject type.
>>
>> However, I guess there shall be a way to access "f" value
>> directly from PyEval_EvalCode return object:
>>
>> PyObject* evalRet = ::PyEval_EvalCode(...);
>>
>> But, I can't find any details what the "evalRet" actually is.
>
> Eval is to eval an expression. If you simply eval the expression "f" in
> the context of the module you should get the result returned. Obviously
> though it is designed to eval more complex expressions and in your
> specific example, doing the getattr thing will also work fine.

Hi Mark,

So, the result of PyEval_EvalCode strictly depends on the code being 
evaluated. It makes sense.

Thanks for help!

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org
Member of ACCU, http://accu.org


From gelonida at gmail.com  Fri Sep 23 06:23:57 2011
From: gelonida at gmail.com (Gelonida N)
Date: Fri, 23 Sep 2011 12:23:57 +0200
Subject: cProfile and name spaces.
Message-ID: <j5hmo1$6mi$1@dough.gmane.org>

Hi

I have following piece of code in file f1.py

##### f1.py starts here #######
def f():
    pass

def main():
    import profile
    profile.run('f()')

if __name__ == '__main__':
    main()
# ------ end of f1.py ----


executing f1.py works as expected.

Now I have a file f2.py
##### f2.py starts here #######
import f1
f1.main()
# ------ end of f2.py ----


If I run f2.py

I get the error message:
. . . .
>   File "C:\Python26\lib\profile.py", line 70, in run
>     prof = prof.run(statement)
>   File "C:\Python26\lib\profile.py", line 456, in run
>     return self.runctx(cmd, dict, dict)
>   File "C:\Python26\lib\profile.py", line 462, in runctx
>     exec cmd in globals, locals
>   File "<string>", line 1, in <module>
> NameError: name 'f' is not defined

So  cProfile doesn't find my function f any more.

I can fix this by changing the code in f1.py to

profile.run('f1.f()')

However now I can't run f1.py anymore.


Is it intentional, that cProfile always uses the name space of the
initial module?

I consider it surprising especially as I did not find any mentioning of
this particularity in the documentation, which states:


> cProfile.run(command[, filename])
> 
> This function takes a single argument that can be passed to the exec
> statement, and an optional file name. In all cases this routine attempts
> to exec its first argument, and gather profiling statistics from the
> execution. If no file name is present, then this function automatically
> prints a simple profiling report, sorted by the standard name string
> (file/line/function-name) that is presented in each line. The following
> is a typical output from such a call:


I'm using python 2.6.5

The reason why I don't profile at the top level is, that I do not want
to profile some parts of the code and as I want to
conditionally profile  a cetain function within different contexts /
applications

WI have also difficulties implementing something like this in a module,
which
is not the main module.

arg1 = f(1)
arg2 = f2()
if do_profile:
    CProfile('result = function_name(arg1, arg2)', fname)
else:
    result = function_name(arg1, arg2)


Any tips / suggestions??












From andrea.crotti.0 at gmail.com  Fri Sep 23 07:02:00 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 12:02:00 +0100
Subject: Develop inter-dependent eggs
Message-ID: <4E7C6728.7040500@gmail.com>

Develop inter-dependent eggs:

On a Linux machine I have many eggs to develop, for example

- egg1
- egg2
...

Now the eggs depend from each other, so running
"python setup.py develop" in order, doesn't work, because if the 
dependency required is not already installed then easy_install tries to 
fetch it from PyPi.

I looked around everywhere, but I can't find any feasible option, how do 
I tell easy_install to install the dependencies needed from a filesystem 
position and not from the PyPi server?


From yasar11732 at gmail.com  Fri Sep 23 07:44:27 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Fri, 23 Sep 2011 14:44:27 +0300
Subject: Need help with file encoding-decoding
Message-ID: <CAFEUn8Y1sEti_3wb4nZkKhCVtjrQQsYkSszWbp8ZWsyT+xQ4rQ@mail.gmail.com>

Hi,

I'am trying to write a mass html downloader, and it processes files after it
downloaded them. I have problems with encodings, and decodings. Sometimes I
get UnicodeDecodeErrors, or
I get half-pages in after processing part. Or more generally, some things
don't feel right. Can you check my approach, and provide me some feedback
please? Here is what I am doing.

1) send a HEAD request to file's source to get file encoding, set encoding
variable accordingly.
2) if server doesn't provide an encoding, set encoding variable as utf-8
3) read html page from internet, read it to a variable let's say content.
4) in this step, I need to parse the content I get, because I will search
for further links \
        I feed content to parser (subclass of HTMLParser.HTMLParser) like
this -> content.decode(encoding)
5) open a file in binary mod open(file_path,"wb")
6) I write as I read without modifing.

##########
# After processing part....
##########

(Note: encoding variable is same as the downloading part)

1) open local file in binary mod for reading file_name =
open(file_path,"rb")
2) decode the file contents into a variable => decoded_content =
file_name.read().decode(encoding)
3) send decoded content to a parser, parser contstruct new html content. (as
str)
4) open same file for writing, in binary mod, write parsers output like
this: file_name.write(parser.output.encode(encoding))
-- 
http://yasar.serveblog.net/
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From chris at simplistix.co.uk  Fri Sep 23 07:52:40 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 23 Sep 2011 12:52:40 +0100
Subject: [TIP] TestFixtures 2.0.0 Released!
In-Reply-To: <4E7C3961.8020107@simplistix.co.uk>
References: <4E7C3961.8020107@simplistix.co.uk>
Message-ID: <4E7C7308.7020709@simplistix.co.uk>

On 23/09/2011 08:46, Chris Withers wrote:
> I'm happy to announce a new release major release of TestFixtures.
> This release is 99% backwards compatible, but a lot has changed under
> the hood and there's some major new functionality, so thought it was
> time for a bump.

Of course, a 2.0.0 release wouldn't be complete without a fairly 
show-stopping lack of backwards compatibility... Thankfully, I've 
managed to return the case (comparison of generators with iterators) to 
its previous state with the 2.0.1 release I've just pushed out...

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From python at bdurham.com  Fri Sep 23 08:09:40 2011
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 23 Sep 2011 08:09:40 -0400
Subject: python install on locked down windows box?
In-Reply-To: <CAB4yi1NYEBSoeLTsY-fDoXmbdjx7SEv6_G5CDtjBckMRRijiAA@mail.gmail.com>
References: <mailman.1357.1316683648.27778.python-list@python.org><4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
	<CAB4yi1NYEBSoeLTsY-fDoXmbdjx7SEv6_G5CDtjBckMRRijiAA@mail.gmail.com>
Message-ID: <1316779780.12406.140258146888625@webmail.messagingengine.com>

Hi Matt,

Enjoyed your list options :)

I'm a consultant and have to do what your subject line asks at
most clients I work at.

Here's the technique I recommend:

Install Python for the ***current user*** on another workstation
with the appropriate priviledges. Then xcopy this Python folder
to a USB drive. Then xcopy this folder from your USB drive to a
matching folder on your locked down workstation.

The xcopy-ed version of Python will run without problems when you
start the python.exe executable from a command line with a python
script as a command line parameter. The only thing you won't be
able to do is click on .py* files and have them automatically
invoke the Python interpreter because file associations require
admin rights to update the registery. I don't consider this a big
deal.

Good luck!

Malcolm
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From philip at semanchuk.com  Fri Sep 23 09:14:15 2011
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 23 Sep 2011 09:14:15 -0400
Subject: Need help with file encoding-decoding
In-Reply-To: <CAFEUn8Y1sEti_3wb4nZkKhCVtjrQQsYkSszWbp8ZWsyT+xQ4rQ@mail.gmail.com>
References: <CAFEUn8Y1sEti_3wb4nZkKhCVtjrQQsYkSszWbp8ZWsyT+xQ4rQ@mail.gmail.com>
Message-ID: <6CE93FA9-E24F-4FB7-ABA2-24F2F611978A@semanchuk.com>


On Sep 23, 2011, at 7:44 AM, Ya?ar Arabac? wrote:

> Hi,
> 
> I'am trying to write a mass html downloader, and it processes files after it
> downloaded them. I have problems with encodings, and decodings. Sometimes I
> get UnicodeDecodeErrors, or
> I get half-pages in after processing part. Or more generally, some things
> don't feel right. Can you check my approach, and provide me some feedback
> please? Here is what I am doing.
> 
> 1) send a HEAD request to file's source to get file encoding, set encoding
> variable accordingly.

Hi Ya?ar
This is a pretty optimistic algorithm, at least by the statistics from 2008 (see below). 


> 2) if server doesn't provide an encoding, set encoding variable as utf-8

This is statistically a good guess but it doesn't follow the HTTP specification.


> 4) in this step, I need to parse the content I get, because I will search
> for further links \
>        I feed content to parser (subclass of HTMLParser.HTMLParser) like

Does HTMLParser.HTMLParser handle broken HTML? Because there's lots of it out there.

I used to run an automated site validator, and I wrote a couple of articles you might find interesting. One is about how to get the encoding of a Web page:
http://NikitaTheSpider.com/articles/EncodingDivination.html

I also wrote an article examining the statistics I'd seen run through the crawler/validator. One thing I saw was that almost 2/3 of Web pages specified the encoding in the META HTTP-EQUIV Content-Type tag rather than in the HTTP Content-Type header. Mind you, this was three years ago so the character of the Web has likely changed since then, but probably not too dramatically.
http://NikitaTheSpider.com/articles/ByTheNumbers/fall2008.html

You can also do some straightforward debugging. Save the raw bytes you get from each site, and when you encounter a decode error, check the raw bytes. Are they really in the encoding specified? Webmasters make all kinds of mistakes. 


Hope this helps
Philip



> this -> content.decode(encoding)
> 5) open a file in binary mod open(file_path,"wb")
> 6) I write as I read without modifing.
> 
> ##########
> # After processing part....
> ##########
> 
> (Note: encoding variable is same as the downloading part)
> 
> 1) open local file in binary mod for reading file_name =
> open(file_path,"rb")
> 2) decode the file contents into a variable => decoded_content =
> file_name.read().decode(encoding)
> 3) send decoded content to a parser, parser contstruct new html content. (as
> str)
> 4) open same file for writing, in binary mod, write parsers output like
> this: file_name.write(parser.output.encode(encoding))
> -- 
> http://yasar.serveblog.net/
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From jeanmichel at sequans.com  Fri Sep 23 09:17:53 2011
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 23 Sep 2011 15:17:53 +0200
Subject: extending class
In-Reply-To: <4E7C52F5.5060301@gmail.com>
References: <4E7C4D6A.8050107@gmail.com> <j5hjlj$him$1@dough.gmane.org>
	<4E7C52F5.5060301@gmail.com>
Message-ID: <4E7C8701.5020302@sequans.com>

Andrea Crotti wrote:
> On 09/23/2011 10:31 AM, Peter Otten wrote:
>>
>> Inside __getattribute__() you ask for self.first_var which triggers 
>> another
>> __getattribute__() call that once again trys to determine the first_var
>> attribute before it returns...
>>
>> Try using __getattr__() instead which is only triggered for non-existent
>> attributes
>>
>> def __getattr__(self, name):
>>      return getattr(self.first_var, name)
>>
>> or check for the attributes you don't want to delegate explicitly:
>>
>> def __getattribute__(self, name):
>>      if name == "first_var":
>>          return super(PSIVar, self).__getattribute__(name)
>>
>
> Right thanks a lot it works perfectly.
> I don't like too much, however, to mess around in this way, maybe it's 
> better if I just fork the project
> and patch the original code.
>
> In this way maybe I can also contribute to it with patches (if they 
> are accepted)...
Did you consider subclassing your Var class ? This is how you extend a 
class behavior in OOP.

class PSIVar(var):
    def __init__(self, name, desc, other=None, fun=None):
        var.__init__(self, name, desc)
        if other is not None:
            self.other = other
            self.fun = fun
            assert callable(self.fun)

v1 = PSIVar('name', 'desc')

that's it.

By the way, don't create instance attribute conditionally. Your PSIVar 
instance should always have a 'other' attribute, its value can be None 
though.



JM


From bahamutzero8825 at gmail.com  Fri Sep 23 09:57:32 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Fri, 23 Sep 2011 08:57:32 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmrzvFwqD_w5BxaQycSzsFSwVFiPzFKEAdhF=1_scw7ReQ@mail.gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
	<CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
	<4E7AEAEE.20504@gmail.com>
	<CAPTjJmrzvFwqD_w5BxaQycSzsFSwVFiPzFKEAdhF=1_scw7ReQ@mail.gmail.com>
Message-ID: <4E7C904C.3020604@gmail.com>

On 2011.09.22 03:12 AM, Chris Angelico wrote:
> In theory, this should mean that you load it fresh every time - I
> think. If not, manually deleting entries from sys.modules might help,
> either with or without the list of modules.
I've played around with sys.modules, and it seems there are issues with
logging being reloaded (not sure if it's fair to call it a bug), not my
module. The only reliable way I've found to start fresh is to delete at
least logging from sys.modules (I can even do this from within my
module). Even if the module that imports logging is deleted, things in
logging persist (I can confirm at least handlers and handles to log
files; the latter requiring garbage collection as well to free up).
However, this would probably wreak havoc on other code that uses logging
(although, I could always import logging as something else).

On a side note, this actually gives me a good way to detect that the
module is reloaded (I can't think of any other way to detect it, at
least not off the top of my head).
-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From andrea.crotti.0 at gmail.com  Fri Sep 23 09:59:56 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 14:59:56 +0100
Subject: extending class
In-Reply-To: <4E7C8701.5020302@sequans.com> (Jean-Michel Pichavant's message
	of "Fri, 23 Sep 2011 15:17:53 +0200")
References: <4E7C4D6A.8050107@gmail.com> <j5hjlj$him$1@dough.gmane.org>
	<4E7C52F5.5060301@gmail.com> <4E7C8701.5020302@sequans.com>
Message-ID: <87pqirnyub.fsf@gmail.com>

Jean-Michel Pichavant <jeanmichel at sequans.com> writes:

> Did you consider subclassing your Var class ? This is how you extend a
> class behavior in OOP.
>
> class PSIVar(var):
>    def __init__(self, name, desc, other=None, fun=None):
>        var.__init__(self, name, desc)
>        if other is not None:
>            self.other = other
>            self.fun = fun
>            assert callable(self.fun)
>
> v1 = PSIVar('name', 'desc')
>
> that's it.
>
> By the way, don't create instance attribute conditionally. Your PSIVar
> instance should always have a 'other' attribute, its value can be None
> though.
>
>
>
> JM


Yes thanks, first I tried that, but I didn't want to have to change my
class definition if the one from the library changes.  So I started to
mess with *args and **kwargs and it was really not beautiful ;)

Anyway since I want to other and more deep changes I just forked the
project and start work on that...


From gmszone at gmail.com  Fri Sep 23 10:01:27 2011
From: gmszone at gmail.com (gmszone)
Date: Fri, 23 Sep 2011 07:01:27 -0700 (PDT)
Subject: Could anybody tell me how to make a version of Nokia Symbian os
Message-ID: <9e03e15b-4d1e-4af7-8e80-751ab9e2f35f@f12g2000yqi.googlegroups.com>

I like the Python in my mobile phone.But a don't have the enough money
to buy a new phone.And my mobile type is Nokia N72 which is a part of
S60v2.And I could program in some boring classes.But the version of my
mobile's python is to old.So I hope I coule learn how to  compile it
for my N72.My notebook has the Windows 7 and Ubuntu GNU/Linux.Ask for
help.....


From steve+comp.lang.python at pearwood.info  Fri Sep 23 10:21:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 00:21:53 +1000
Subject: extending class
References: <mailman.1384.1316769390.27778.python-list@python.org>
Message-ID: <4e7c9602$0$30000$c3e8da3$5496439d@news.astraweb.com>

Andrea Crotti wrote:

> I wanted to add a couple of parameters to a class from a given library
> (paste-script), but without changing the original code.
> So I thought, I create a wrapper class which adds what I need, and then
> dispatch all the calls to the super class.

You don't need to use a wrapper class if all you want is to add additional
attributes to an instance.

>>> class Spam(object):
...     def __init__(self):
...             self.x = 1
...
>>> s = Spam()
>>> s.name = "Fred"
>>> s.name
'Fred'


> My following attempt gives, however, a recursion error, but why?

Here is an old recipe showing how to do automatic delegation correctly:

http://code.activestate.com/recipes/52295/



-- 
Steven



From w.g.sneddon at gmail.com  Fri Sep 23 10:25:55 2011
From: w.g.sneddon at gmail.com (python)
Date: Fri, 23 Sep 2011 07:25:55 -0700 (PDT)
Subject: pyWin build 216
Message-ID: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>

I have used pyWin for several years now with out issue.   I recently
installed build 216 for python 2.7 on windows XP pro.   The program
crashes every time I exit a wxPython program and has crashed a few
other times.  I does not seem that pyWin has been updated since
February of this year.   Is there a direction change for the windows
extensions?  Is it time I make the move to 3.x?  Mark Hammond has
given much to the Python community and I do not intend for this post
to be negative in any way.


From atherun at gmail.com  Fri Sep 23 10:58:07 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 07:58:07 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<mailman.1381.1316761723.27778.python-list@python.org>
Message-ID: <5bd0c088-0f46-4e4a-b5c5-9d8de668b50d@v18g2000yqj.googlegroups.com>

On Sep 23, 12:08?am, Chris Angelico <ros... at gmail.com> wrote:
> On Fri, Sep 23, 2011 at 3:59 PM, Nobody <nob... at nowhere.com> wrote:
> > It doesn't even
>
> You intrigue me, sir. Does it odd?
>
> What is the remainder of this aborted sentence?
>
> ChrisA

That is odd, I also find it odd that it deadlocks the entire python
system, even threads that have nothing to do with the subprocess stop
working, the entire thing just stops. I may not have pasted the full
stack trace looking at it again, I'll double check in a few.

I was able to repro this on a tool I have the source for, when I
attach to it to debug visual studio tells me the threads are
deadlocked and the only stack trace I have available to me is a low
level os call to a WriteFile function.


From brian.curtin at gmail.com  Fri Sep 23 11:01:04 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Fri, 23 Sep 2011 10:01:04 -0500
Subject: pyWin build 216
In-Reply-To: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
References: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
Message-ID: <CAD+XWwo33mPinnk5ZBMKYHCAYsexTpLxOt+JZT=qNPnHqJ=Uhg@mail.gmail.com>

On Fri, Sep 23, 2011 at 09:25, python <w.g.sneddon at gmail.com> wrote:
> I have used pyWin for several years now with out issue. ? I recently
> installed build 216 for python 2.7 on windows XP pro. ? The program
> crashes every time I exit a wxPython program and has crashed a few
> other times. ?I does not seem that pyWin has been updated since
> February of this year. ? Is there a direction change for the windows
> extensions? ?Is it time I make the move to 3.x? ?Mark Hammond has
> given much to the Python community and I do not intend for this post
> to be negative in any way.

pywin32 has been available for 3.x for some time, but you wouldn't be
able to use it since you're currently using wxPython.

You may want to post a more detailed question to
http://mail.python.org/mailman/listinfo/python-win32 -- Mark hangs out
there and there are plenty of pywin32 experts around who could help as
well.


From jesus.ramirez.utexas at gmail.com  Fri Sep 23 11:41:59 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Fri, 23 Sep 2011 08:41:59 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>

Python 2.5.6 (r256:88840, Sep 22 2011, 13:45:58)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import zlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named zlib
>>>

But if I run Python2.7 I get:

Python 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import zlib
>>>

It seems to work.



From chris at simplistix.co.uk  Fri Sep 23 13:06:19 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 23 Sep 2011 18:06:19 +0100
Subject: python install on locked down windows box?
In-Reply-To: <4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1357.1316683648.27778.python-list@python.org>
	<4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7CBC8B.8000501@simplistix.co.uk>

Hi Steve

On 22/09/2011 13:58, Steven D'Aprano wrote:
> (7) If all else fails, as an absolute last resort, simply run the Windows
> installer as a regular, unprivileged user, after selecting the option for a
> Non-Admin Install under Advanced Options first.

Thanks for this, will send on to my friend in need...
Hadn't seen this before, but it's a long time since I've run the Windows 
installer ;-)

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From atherun at gmail.com  Fri Sep 23 13:07:56 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 10:07:56 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<mailman.1381.1316761723.27778.python-list@python.org>
	<5bd0c088-0f46-4e4a-b5c5-9d8de668b50d@v18g2000yqj.googlegroups.com>
Message-ID: <7133358a-3fd0-4dfd-8af7-d8afaa9c6597@z7g2000vbp.googlegroups.com>

On Sep 23, 7:58?am, Atherun <athe... at gmail.com> wrote:
> On Sep 23, 12:08?am, Chris Angelico <ros... at gmail.com> wrote:
>
> > On Fri, Sep 23, 2011 at 3:59 PM, Nobody <nob... at nowhere.com> wrote:
> > > It doesn't even
>
> > You intrigue me, sir. Does it odd?
>
> > What is the remainder of this aborted sentence?
>
> > ChrisA
>
> That is odd, I also find it odd that it deadlocks the entire python
> system, even threads that have nothing to do with the subprocess stop
> working, the entire thing just stops. I may not have pasted the full
> stack trace looking at it again, I'll double check in a few.
>
> I was able to repro this on a tool I have the source for, when I
> attach to it to debug visual studio tells me the threads are
> deadlocked and the only stack trace I have available to me is a low
> level os call to a WriteFile function.

Ya heres the full python stack:


ntoskrnl.exe!memset+0x64a
ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!__misaligned_access+0xba4
ntoskrnl.exe!__misaligned_access+0x1821
ntoskrnl.exe!KeWaitForMultipleObjects+0xf5d
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!NtWaitForSingleObject+0xde
ntoskrnl.exe!KeSynchronizeExecution+0x3a43
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x6c0
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x4a8
wow64.dll!Wow64SystemServiceEx+0x1ce
wow64.dll!Wow64LdrpInitialize+0x429
ntdll.dll!RtlUniform+0x6e6
ntdll.dll!RtlCreateTagHeap+0xa7
ntdll.dll!LdrInitializeThunk+0xe
ntdll.dll!ZwWaitForSingleObject+0x15
kernel32.dll!WaitForSingleObjectEx+0x43
kernel32.dll!WaitForSingleObject+0x12
python26.dll!_Py_svnversion+0xcf8
python26.dll!PyObject_AsReadBuffer+0x46d
python26.dll!PyEval_EvalCodeEx+0x738
python26.dll!PyEval_EvalFrameEx+0x467
python26.dll!PyObject_Realloc+0x90
python26.dll!PyEval_EvalCodeEx+0x8ef
python26.dll!PyEval_EvalFrameEx+0x467


From msoulier at digitaltorque.ca  Fri Sep 23 13:15:25 2011
From: msoulier at digitaltorque.ca (Michael P. Soulier)
Date: Fri, 23 Sep 2011 13:15:25 -0400
Subject: ANN: Urwid 1.0.0 - Console UI Library
In-Reply-To: <4E7B4E9C.7060704@excess.org>
References: <4E7B4E9C.7060704@excess.org>
Message-ID: <20110923171525.GH2703@digitaltorque.ca>

On 22/09/11 Ian Ward said:

> Announcing Urwid 1.0.0
> ----------------------

Congrats. 


From nobody at nowhere.com  Fri Sep 23 13:47:20 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 23 Sep 2011 18:47:20 +0100
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
Message-ID: <pan.2011.09.23.17.47.20.100000@nowhere.com>

On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:

>> kernel32.dll!WaitForSingleObject+0x12
>> python26.dll!_Py_svnversion+0xcf8
> 
> I haven't a clue how this happens. _Py_svnversion just returns a string:

In retrospect, I think that's a red herring. 0xcf8 seems like too large an
offset for such a small function. I think that it's more likely to be in a
non-exported function, and _Py_svnversion just happens to be the last
exported symbol prior to that point in the code.



From atherun at gmail.com  Fri Sep 23 13:59:27 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 10:59:27 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<pan.2011.09.23.17.47.20.100000@nowhere.com>
Message-ID: <2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>

On Sep 23, 10:47?am, Nobody <nob... at nowhere.com> wrote:
> On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:
> >> kernel32.dll!WaitForSingleObject+0x12
> >> python26.dll!_Py_svnversion+0xcf8
>
> > I haven't a clue how this happens. _Py_svnversion just returns a string:
>
> In retrospect, I think that's a red herring. 0xcf8 seems like too large an
> offset for such a small function. I think that it's more likely to be in a
> non-exported function, and _Py_svnversion just happens to be the last
> exported symbol prior to that point in the code.

I have the call stacks for each python thread running up until the
dead lock:

# ThreadID: 992
  out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()

# ThreadID: 5516
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

# ThreadID: 2668
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 69, in
run
  self.stacktraces()
File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 86, in
stacktraces
  fout.write(stacktraces())
File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 26, in
stacktraces
  for filename, lineno, name, line in traceback.extract_stack(stack):

# ThreadID: 3248
  out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()


# ThreadID: 7700
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

# ThreadID: 8020
  out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()

# ThreadID: 4252
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

The StackTracer thread freezes trying to update my output file, and
yes I'm trying to 3 tasks in parallel which each one starts by
creating a changelist in perforce.  This is just an easy repro case
for me, it happens with commands other then p4.  This almost looks
like a threading issue more then the output deadlock.


From luch at ank-sia.com  Fri Sep 23 14:21:56 2011
From: luch at ank-sia.com (Alexey Luchko)
Date: Fri, 23 Sep 2011 21:21:56 +0300
Subject: comments on runpy module
Message-ID: <4E7CCE44.8030508@ank-sia.com>

Hi!

I've just had fun with the runpy module in Python 2.7.  I'm writing to 
share it :)

What I've tried is to "load" a python script using runpy.run_path(), take a 
function from the resulting namespace and call it with arbitrary arguments.

All the functions in the namespace seem to be ok.  repr(namespace["f"]) 
gives "<function f at 0x005531F0>".

But if the f() is referring the modules namespace (I supposed it is the 
same as the returned one), all the values appear to be None.

Example script.py: """
def f(arg):
    return g(arg)

def g(arg):
    return arg
"""

Then running main.py: """
import runpy

namespace = runpy.run_path("./script.py")
print namespace["f"]
print namespace["g"]

print namespace["f"]("abc")
"""

gives such an output """
<function f at 0x005524F0>
<function g at 0x023F0830>
Traceback (most recent call last):
   File "main.py", line 7, in <module>
     print namespace["f"]("abc")
   File "./script.py", line 2, in f
     return g(arg)
TypeError: 'NoneType' object is not callable
"""

Reading the Lib/runpy.py I've found, that the temporary module created 
inside the run_path() calls, is destroyed right after the script.py code 
executed in the resulting namespace.

I suppose that it is ether an issue or a feature that should be documented :)

--
Have a good time and a good mood!

Alex.


From luch at ank-sia.com  Fri Sep 23 14:38:36 2011
From: luch at ank-sia.com (Alexey Luchko)
Date: Fri, 23 Sep 2011 21:38:36 +0300
Subject: comments on runpy module
In-Reply-To: <4E7CCE44.8030508@ank-sia.com>
References: <4E7CCE44.8030508@ank-sia.com>
Message-ID: <4E7CD22C.5040308@ank-sia.com>

> Example script.py: """
> def f(arg):
>     return g(arg)
>
> def g(arg):
>     return arg
> """

> Reading the Lib/runpy.py I've found, that the temporary module created
> inside the run_path() calls, is destroyed right after the script.py code
> executed in the resulting namespace.

I've got an idea.  It would be nice if there existed such a way to use it:
with runpy.run_path("script.py") as a_namespace:
   a_namespace["f"]("abc")

--
Regards,
Alex.


From Phillip.M.Feldman at gmail.com  Fri Sep 23 16:09:32 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Fri, 23 Sep 2011 13:09:32 -0700 (PDT)
Subject: strange behavior from recursive generator
Message-ID: <32503886.post@talk.nabble.com>


A few weeks ago, I wrote a class that creates an iterator for solving the
general unlabeled-balls-in-labeled boxes occupancy problem. Chris Rebert
converted my code to a generator, which made the code cleaner, and I
subsequently simplified it somewhat further.

My problem is the following: All of these versions of the code work fine for
very small problems, but do not produce the full set of occupancy
distributions for larger problems. The following sample input and output
show what happens with two balls and two boxes (to keep things simple, I've
made the boxes large enough so that each box can hold both balls).

In [6]: x= balls_in_labeled_boxes(2,[2,2])

In [7]: list(x)
balls=2, box_sizes=[2, 2]
About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2]
i=0, distribution_other=(0,)
About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2]
i=0, distribution_other=(1,)
About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2]
i=0, distribution_other=(2,)
Out[7]: [(2, 0), (1, 1), (0, 2)]

Note that Out[7] above gives the correct result, showing all three possible
distributions. Now lets try the same thing with three boxes.

In [8]: x= balls_in_labeled_boxes(2,[2,2,2])

In [9]: list(x)
balls=2, box_sizes=[2, 2, 2]
About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2, 2]
i=0, distribution_other=(0, 0)
About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2, 2]
i=0, distribution_other=(1, 0)
About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2, 2]
i=0, distribution_other=(2, 0)
i=1, distribution_other=(1, 1)
Out[9]: [(2, 0, 0), (1, 1, 0), (0, 2, 0), (0, 1, 1)]

When there are no balls in the initial box, the recursive call should
produce the same three occupancy distributions that we saw above, but one of
them is now missing. If someone can shed light on why this is happening, I'd
be grateful.

Phillip

http://old.nabble.com/file/p32503886/balls_in_labeled_boxes.py
balls_in_labeled_boxes.py 
-- 
View this message in context: http://old.nabble.com/strange-behavior-from-recursive-generator-tp32503886p32503886.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From arnodel at gmail.com  Fri Sep 23 16:26:13 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 23 Sep 2011 21:26:13 +0100
Subject: strange behavior from recursive generator
In-Reply-To: <32503886.post@talk.nabble.com>
References: <32503886.post@talk.nabble.com>
Message-ID: <CAJ6cK1bxBtshYVbU3C5+KdQ+chDyEeDtPDSa6bEyx6ZcxT1FCw@mail.gmail.com>

On 23 September 2011 21:09, Dr. Phillip M. Feldman
<Phillip.M.Feldman at gmail.com> wrote:
>
> A few weeks ago, I wrote a class that creates an iterator for solving the
> general unlabeled-balls-in-labeled boxes occupancy problem. Chris Rebert
> converted my code to a generator, which made the code cleaner, and I
> subsequently simplified it somewhat further.
>
> My problem is the following: All of these versions of the code work fine for
> very small problems, but do not produce the full set of occupancy
> distributions for larger problems. The following sample input and output
> show what happens with two balls and two boxes (to keep things simple, I've
> made the boxes large enough so that each box can hold both balls).
>
> In [6]: x= balls_in_labeled_boxes(2,[2,2])
>
> In [7]: list(x)
> balls=2, box_sizes=[2, 2]
> About to make recursive call. ?balls_in_other_boxes=0, box_sizes=[2]
> i=0, distribution_other=(0,)
> About to make recursive call. ?balls_in_other_boxes=1, box_sizes=[2]
> i=0, distribution_other=(1,)
> About to make recursive call. ?balls_in_other_boxes=2, box_sizes=[2]
> i=0, distribution_other=(2,)
> Out[7]: [(2, 0), (1, 1), (0, 2)]
>
> Note that Out[7] above gives the correct result, showing all three possible
> distributions. Now lets try the same thing with three boxes.
>
> In [8]: x= balls_in_labeled_boxes(2,[2,2,2])
>
> In [9]: list(x)
> balls=2, box_sizes=[2, 2, 2]
> About to make recursive call. ?balls_in_other_boxes=0, box_sizes=[2, 2]
> i=0, distribution_other=(0, 0)
> About to make recursive call. ?balls_in_other_boxes=1, box_sizes=[2, 2]
> i=0, distribution_other=(1, 0)
> About to make recursive call. ?balls_in_other_boxes=2, box_sizes=[2, 2]
> i=0, distribution_other=(2, 0)
> i=1, distribution_other=(1, 1)
> Out[9]: [(2, 0, 0), (1, 1, 0), (0, 2, 0), (0, 1, 1)]
>
> When there are no balls in the initial box, the recursive call should
> produce the same three occupancy distributions that we saw above, but one of
> them is now missing. If someone can shed light on why this is happening, I'd
> be grateful.

Line 46:

         for distribution_other in _balls_in_unlabeled_boxes(

Should be:


         for distribution_other in _balls_in_labeled_boxes(

HTH

-- 
Arnaud


From lists at cheimes.de  Fri Sep 23 17:20:44 2011
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 23 Sep 2011 23:20:44 +0200
Subject: Python 2.5 zlib trouble
In-Reply-To: <308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
Message-ID: <j5it7d$mfj$1@dough.gmane.org>

Am 23.09.2011 17:41, schrieb Jesramz:
> Python 2.5.6 (r256:88840, Sep 22 2011, 13:45:58)
> [GCC 4.5.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import zlib
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named zlib

Are you running a self-compiled installation of Python 2.5 on recent
Debian or Ubuntu? Check out my blog
http://lipyrary.blogspot.com/2011/05/how-to-compile-python-on-ubuntu-1104.html

Christian



From jesus.ramirez.utexas at gmail.com  Fri Sep 23 17:34:16 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Fri, 23 Sep 2011 14:34:16 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
Message-ID: <78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>


Thank You Christian

Im running on Ubuntu Natty and I am not running a self-compiled
install, its a regular release. In order to do this:

  $ make distclean
   $ export LDFLAGS="-L/usr/lib/$(dpkg-architecture -
qDEB_HOST_MULTIARCH)"
   $ ./configure
   $ make
   $ make install
   $ unset LDFLAGS

If you can, can you explain the steps for this, can I run this in a
regular release of Python2.5?


From phillip.m.feldman at gmail.com  Fri Sep 23 19:42:13 2011
From: phillip.m.feldman at gmail.com (Phillip Feldman)
Date: Fri, 23 Sep 2011 16:42:13 -0700
Subject: strange behavior from recursive generator
In-Reply-To: <CAJ6cK1bxBtshYVbU3C5+KdQ+chDyEeDtPDSa6bEyx6ZcxT1FCw@mail.gmail.com>
References: <32503886.post@talk.nabble.com>
	<CAJ6cK1bxBtshYVbU3C5+KdQ+chDyEeDtPDSa6bEyx6ZcxT1FCw@mail.gmail.com>
Message-ID: <CAB2ViTbM0+2ffKs4tqCTsn0WMtKPCTFpnrvs6RvUeCV-PLAAKw@mail.gmail.com>

I don't know how many times I stared at that code without seeing the error.

Thanks so much!

Phillip

On Fri, Sep 23, 2011 at 1:26 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:

> On 23 September 2011 21:09, Dr. Phillip M. Feldman
> <Phillip.M.Feldman at gmail.com> wrote:
> >
> > A few weeks ago, I wrote a class that creates an iterator for solving the
> > general unlabeled-balls-in-labeled boxes occupancy problem. Chris Rebert
> > converted my code to a generator, which made the code cleaner, and I
> > subsequently simplified it somewhat further.
> >
> > My problem is the following: All of these versions of the code work fine
> for
> > very small problems, but do not produce the full set of occupancy
> > distributions for larger problems. The following sample input and output
> > show what happens with two balls and two boxes (to keep things simple,
> I've
> > made the boxes large enough so that each box can hold both balls).
> >
> > In [6]: x= balls_in_labeled_boxes(2,[2,2])
> >
> > In [7]: list(x)
> > balls=2, box_sizes=[2, 2]
> > About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2]
> > i=0, distribution_other=(0,)
> > About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2]
> > i=0, distribution_other=(1,)
> > About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2]
> > i=0, distribution_other=(2,)
> > Out[7]: [(2, 0), (1, 1), (0, 2)]
> >
> > Note that Out[7] above gives the correct result, showing all three
> possible
> > distributions. Now lets try the same thing with three boxes.
> >
> > In [8]: x= balls_in_labeled_boxes(2,[2,2,2])
> >
> > In [9]: list(x)
> > balls=2, box_sizes=[2, 2, 2]
> > About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2, 2]
> > i=0, distribution_other=(0, 0)
> > About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2, 2]
> > i=0, distribution_other=(1, 0)
> > About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2, 2]
> > i=0, distribution_other=(2, 0)
> > i=1, distribution_other=(1, 1)
> > Out[9]: [(2, 0, 0), (1, 1, 0), (0, 2, 0), (0, 1, 1)]
> >
> > When there are no balls in the initial box, the recursive call should
> > produce the same three occupancy distributions that we saw above, but one
> of
> > them is now missing. If someone can shed light on why this is happening,
> I'd
> > be grateful.
>
> Line 46:
>
>         for distribution_other in _balls_in_unlabeled_boxes(
>
> Should be:
>
>
>         for distribution_other in _balls_in_labeled_boxes(
>
> HTH
>
> --
> Arnaud
>
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From greg.ewing at canterbury.ac.nz  Fri Sep 23 20:07:54 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 24 Sep 2011 12:07:54 +1200
Subject: Context manager with class methods
In-Reply-To: <mailman.1376.1316732239.27778.python-list@python.org>
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
	<mailman.1376.1316732239.27778.python-list@python.org>
Message-ID: <9e4lasFv7sU1@mid.individual.net>

Terry Reedy wrote:

> it is normal to look for special methods on the class (and superclasses)
 > of an object rather than starting with the object itself.

> I suspect there was a deliberate change to correct an anomaly, though 
> this might have been done as part of some other change.

It's a necessary consequence of the fact that new-style classes
are also instances. Without it, there would be an ambiguity as
to whether a special method defined the behaviour of instances
of a class or of the class object itself.

It also increases efficiency, because for those special methods
that correspond to C-level type slots, you only have to look
in the type slot to find an implementation of the method,
rather than having to look in the instance dict first.

-- 
Greg


From alec.taylor6 at gmail.com  Fri Sep 23 20:53:06 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 24 Sep 2011 10:53:06 +1000
Subject: Python 2.5 zlib trouble
In-Reply-To: <CAJXGoRkrYxNgsXiffADcUPGtm91e+dt1c2KCNayYesNoymDZ9A@mail.gmail.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<CAO+9iGeNc+r1-KhXfKyOxZhY8t-zKPSo3v0aTQcx2oTepo_n2Q@mail.gmail.com>
	<CAJXGoRkrYxNgsXiffADcUPGtm91e+dt1c2KCNayYesNoymDZ9A@mail.gmail.com>
Message-ID: <CAO+9iGdUwEooODHydD8HkG+3fzSrBjw0K8tZsdNVFzxSjP5kbA@mail.gmail.com>

No idea, as I said before, if you ask for it they might put in the alpha.

On Sat, Sep 24, 2011 at 8:30 AM, Jesse Ramirez
<jesus.ramirez.utexas at gmail.com> wrote:
>
> Thanks Alec, might you know when the 2.7 support might come?


From jesus.ramirez.utexas at gmail.com  Fri Sep 23 21:19:39 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Fri, 23 Sep 2011 18:19:39 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<CAO+9iGeNc+r1-KhXfKyOxZhY8t-zKPSo3v0aTQcx2oTepo_n2Q@mail.gmail.com>
	<CAJXGoRkrYxNgsXiffADcUPGtm91e+dt1c2KCNayYesNoymDZ9A@mail.gmail.com>
	<mailman.1407.1316825588.27778.python-list@python.org>
Message-ID: <5f064e18-57ab-4a7a-b855-e212bb84711d@l4g2000vbz.googlegroups.com>

Thank You Christian

Im running on Ubuntu Natty and I am not running a self-compiled
install, its a regular release. In order to do this:
  $ make distclean
   $ export LDFLAGS="-L/usr/lib/$(dpkg-architecture -
qDEB_HOST_MULTIARCH)"
   $ ./configure
   $ make
   $ make install
   $ unset LDFLAGS

If you can, can you explain the steps for this, can I run this in a
regular release of Python2.5?





From ricky85.phone at gmail.com  Fri Sep 23 21:42:44 2011
From: ricky85.phone at gmail.com (Ricardo)
Date: Fri, 23 Sep 2011 20:42:44 -0500
Subject: can't load an script from html...
Message-ID: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>

Hi everyone
I'm trying to use the cgi library to create a python script and loading it from a web page. I have already done the necessary imports, and the default commands to receive data from "html" are written too. The final version is something like this:

#!/usr/bin/python

import subprocess
import cgi
import cgitb

cgitb.enable()

input = cgi.FieldStorage()

?. my code (do something with input)?.


#printing the response

	print "Content-Type: text/html"    
	print                               
	print "<TITLE>My title:</TITLE>"
	print "</HEAD>"
	print "<BODY>"
	print ?.. bla bla ?
	print "%s"%theoutput
	print "</BODY>"

Besides, my call from my index.html is like this:

 <form action="/scripts/python_script.py" method="post">
      	<input name="inid" type="text" size="20" class="input" /><br/><br/>
        <input type="submit" value="accept"  class="button"/>
 </form>

well, the thing is that when i do the call from the browser: 

http://localhost/index.html 
           |
          V
put the data and click on the "accept" button
           |
          V
http:/localhost/scripts/python_script.py

I only get the python_script.py as a plain test by response (the script printed on my browser). 
I have already changed the permissions for python_script.py. I have checked the import cgi,cgitb in the python shell (i am using v2.7) and they work fine. So, i don't know what it is going wrong here.

A little help please? any idea?
Thanks anyway for your time.




From python at mrabarnett.plus.com  Fri Sep 23 21:57:37 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 24 Sep 2011 02:57:37 +0100
Subject: can't load an script from html...
In-Reply-To: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>
References: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>
Message-ID: <4E7D3911.9030803@mrabarnett.plus.com>

On 24/09/2011 02:42, Ricardo wrote:
> Hi everyone
> I'm trying to use the cgi library to create a python script and loading it from a web page. I have already done the necessary imports, and the default commands to receive data from "html" are written too. The final version is something like this:
>
> #!/usr/bin/python
>
> import subprocess
> import cgi
> import cgitb
>
> cgitb.enable()
>
> input = cgi.FieldStorage()
>
> ?. my code (do something with input)?.
>
>
> #printing the response
>
> 	print "Content-Type: text/html"
> 	print
> 	print "<TITLE>My title:</TITLE>"
> 	print "</HEAD>"
> 	print "<BODY>"
> 	print ?.. bla bla ?
> 	print "%s"%theoutput
> 	print "</BODY>"
>
> Besides, my call from my index.html is like this:
>
>   <form action="/scripts/python_script.py" method="post">
>        	<input name="inid" type="text" size="20" class="input" /><br/><br/>
>          <input type="submit" value="accept"  class="button"/>
>   </form>
>
> well, the thing is that when i do the call from the browser:
>
> http://localhost/index.html
>             |
>            V
> put the data and click on the "accept" button
>             |
>            V
> http:/localhost/scripts/python_script.py
>
> I only get the python_script.py as a plain test by response (the script printed on my browser).
> I have already changed the permissions for python_script.py. I have checked the import cgi,cgitb in the python shell (i am using v2.7) and they work fine. So, i don't know what it is going wrong here.
>
> A little help please? any idea?
> Thanks anyway for your time.
>
If it helps, the responses on my home-make stuff start something like this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
</HEAD>


From anacrolix at gmail.com  Fri Sep 23 22:03:01 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Sat, 24 Sep 2011 12:03:01 +1000
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<pan.2011.09.23.17.47.20.100000@nowhere.com>
	<2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>
Message-ID: <CAB4yi1NDdQsSM3UHaO1T0uZfe_hBC+xPW7ir7ggSZL3KcaS-VQ@mail.gmail.com>

how do you get the call stacks like this?

On Sat, Sep 24, 2011 at 3:59 AM, Atherun <atherun at gmail.com> wrote:
> On Sep 23, 10:47?am, Nobody <nob... at nowhere.com> wrote:
>> On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:
>> >> kernel32.dll!WaitForSingleObject+0x12
>> >> python26.dll!_Py_svnversion+0xcf8
>>
>> > I haven't a clue how this happens. _Py_svnversion just returns a string:
>>
>> In retrospect, I think that's a red herring. 0xcf8 seems like too large an
>> offset for such a small function. I think that it's more likely to be in a
>> non-exported function, and _Py_svnversion just happens to be the last
>> exported symbol prior to that point in the code.
>
> I have the call stacks for each python thread running up until the
> dead lock:
>
> # ThreadID: 992
> ?out, err = proc.communicate("change: new\ndescription: %s
> \n"%changelistDesc)
> File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> communicate
> ?return self._communicate(input)
> File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> _communicate
> ?stdout_thread.join()
> File: "c:\src\extern\python\lib\threading.py", line 637, in join
> ?self.__block.wait()
> File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> ?waiter.acquire()
>
> # ThreadID: 5516
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\extern\python\lib\threading.py", line 477, in run
> ?self.__target(*self.__args, **self.__kwargs)
> File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> _readerthread
> ?buffer.append(fh.read())
>
> # ThreadID: 2668
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 69, in
> run
> ?self.stacktraces()
> File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 86, in
> stacktraces
> ?fout.write(stacktraces())
> File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 26, in
> stacktraces
> ?for filename, lineno, name, line in traceback.extract_stack(stack):
>
> # ThreadID: 3248
> ?out, err = proc.communicate("change: new\ndescription: %s
> \n"%changelistDesc)
> File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> communicate
> ?return self._communicate(input)
> File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> _communicate
> ?stdout_thread.join()
> File: "c:\src\extern\python\lib\threading.py", line 637, in join
> ?self.__block.wait()
> File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> ?waiter.acquire()
>
>
> # ThreadID: 7700
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\extern\python\lib\threading.py", line 477, in run
> ?self.__target(*self.__args, **self.__kwargs)
> File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> _readerthread
> ?buffer.append(fh.read())
>
> # ThreadID: 8020
> ?out, err = proc.communicate("change: new\ndescription: %s
> \n"%changelistDesc)
> File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> communicate
> ?return self._communicate(input)
> File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> _communicate
> ?stdout_thread.join()
> File: "c:\src\extern\python\lib\threading.py", line 637, in join
> ?self.__block.wait()
> File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> ?waiter.acquire()
>
> # ThreadID: 4252
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\extern\python\lib\threading.py", line 477, in run
> ?self.__target(*self.__args, **self.__kwargs)
> File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> _readerthread
> ?buffer.append(fh.read())
>
> The StackTracer thread freezes trying to update my output file, and
> yes I'm trying to 3 tasks in parallel which each one starts by
> creating a changelist in perforce. ?This is just an easy repro case
> for me, it happens with commands other then p4. ?This almost looks
> like a threading issue more then the output deadlock.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From flt.johnson at gmail.com  Fri Sep 23 23:36:05 2011
From: flt.johnson at gmail.com (Fletcher Johnson)
Date: Fri, 23 Sep 2011 20:36:05 -0700 (PDT)
Subject: Why is the shutil module called shutil?
Message-ID: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>

The topic says it all:
Why is shutil named shutil? What does it stand for? This is just a
mild curiosity of mine.
The shutil module for reference: http://docs.python.org/library/shutil.html#module-shutil


From skippy.hammond at gmail.com  Fri Sep 23 23:43:45 2011
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Sat, 24 Sep 2011 13:43:45 +1000
Subject: pyWin build 216
In-Reply-To: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
References: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
Message-ID: <4E7D51F1.7010209@gmail.com>

On 24/09/2011 12:25 AM, python wrote:
> I have used pyWin for several years now with out issue.   I recently
> installed build 216 for python 2.7 on windows XP pro.   The program
> crashes every time I exit a wxPython program and has crashed a few
> other times.

There are a number of issues using Pythonwin to run a program which uses 
a different UI toolkit (eg, wx, Tkinter) and while these have been 
around for many years I don't plan on trying to fix it.  IOW, "don't do 
that" :)

> I does not seem that pyWin has been updated since
> February of this year.   Is there a direction change for the windows
> extensions?  Is it time I make the move to 3.x?  Mark Hammond has
> given much to the Python community and I do not intend for this post
> to be negative in any way.

No problem.  There have been no updates as there is very little to 
update (ie, the code hasn't change a huge amount in hg since then). 
There will probably be a new version in the next month or so, but that 
is quite orthogonal to whether you should move to 3.x - the 3.x version 
of Pythonwin hasn't been updated in the same period and is built from 
the same source tree, so is likely to have exactly the same problems 
(infact is likely to have a few more - there are probably a few 3.x 
specific issues still hiding away).

Mark


From clp2 at rebertia.com  Fri Sep 23 23:58:41 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 23 Sep 2011 20:58:41 -0700
Subject: Why is the shutil module called shutil?
In-Reply-To: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
Message-ID: <CAMZYqRTbnr7n3H4iuxzpaQdDynuPnGrMh0K_FKnXF_DZNN26wQ@mail.gmail.com>

On Fri, Sep 23, 2011 at 8:36 PM, Fletcher Johnson <flt.johnson at gmail.com> wrote:
> The topic says it all:
> Why is shutil named shutil? What does it stand for? This is just a
> mild curiosity of mine.

"sh" is short for "shell", in line with Unix convention, where the
default shell is located at /bin/sh.
http://en.wikipedia.org/wiki/Shell_(computing)
http://en.wikipedia.org/wiki/Unix_shell

"util" is short for "utilities".

shutil is a utility module used to accomplish tasks which one often
does when in the shell, such as copying, moving, or removing directory
trees. But shutil (to my knowledge) is not implemented using shell
commands or by running external programs, so it thus avoids a whole
host of shell-related issues.

It's not the best name, but what with backwards compatibility and all,
it's unlikely to change any time soon.

Cheers,
Chris
--
http://rebertia.com


From 1248283536 at qq.com  Sat Sep 24 00:11:17 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Sat, 24 Sep 2011 12:11:17 +0800
Subject: parse  html:strange  tr  problem
Message-ID: <tencent_111E99F82BF933053E9E16DB@qq.com>

here is my code:
import lxml.html
sfile='http://finance.yahoo.com/q/op?s=A+Options'
root=lxml.html.parse(sfile).getroot()
t = root.xpath("//table[@class='yfnc_datamodoutline1']")[0]
trs=t.xpath(".//tr")
for  i, tr  in  enumerate(trs):
        print (i, len(tr),tr.text_content())

the output is:
0 1 StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70 0.007.007.4531528.00A111022C000280004.35 0.004.654.7520121029.00A111022C000290003.80 0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35 0.000.340.354429339.00A111022C000390000.16 0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33 0.000.100.14218442.00A111022C000420000.08 0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
1 8 StrikeSymbolLastChgBidAskVolOpen Int
2 8 25.00A111022C0002500010.70 0.007.007.45315
3 8 28.00A111022C000280004.35 0.004.654.75201210
4 8 29.00A111022C000290003.80 0.003.954.05426425
5 8 30.00A111022C000300003.110.013.253.355597
6 8 31.00A111022C000310002.700.162.662.717407
7 8 32.00A111022C000320002.110.082.122.172364
8 8 33.00A111022C000330001.870.311.651.7029568
9 8 34.00A111022C000340001.360.151.261.3026649
10 8 35.00A111022C000350000.960.040.940.9845477
11 8 36.00A111022C000360000.720.120.690.7243786
12 8 37.00A111022C000370000.510.030.490.52511,435
13 8 38.00A111022C000380000.35 0.000.340.3544293
14 8 39.00A111022C000390000.16 0.000.220.269149
15 8 40.00A111022C000400000.180.030.150.1853301
16 8 41.00A111022C000410000.33 0.000.100.142184
17 8 42.00A111022C000420000.08 0.000.060.103147
18 8 45.00A111022C000450000.10 0.000.010.05200243

i want to know  why  i=0  the  tr.text_content()'s  value  is :
StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70 0.007.007.4531528.00A111022C000280004.35 0.004.654.7520121029.00A111022C000290003.80 0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35 0.000.340.354429339.00A111022C000390000.16 0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33 0.000.100.14218442.00A111022C000420000.08 0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
it's  strannge thing for me to understand.
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From contropinion at gmail.com  Sat Sep 24 00:49:10 2011
From: contropinion at gmail.com (contro opinion)
Date: Sat, 24 Sep 2011 12:49:10 +0800
Subject: parse html to get tr content
Message-ID: <CA+YdQ_4cRQpsRTt8A211yO0+1CmaYGCE=_20J4PD_baFnxz_Mw@mail.gmail.com>

here is my code:
import lxml.html
sfile='http://finance.yahoo.com/q/op?s=A+Options'<http://finance.yahoo.com/q/op?s=A+Options%27>
root=lxml.html.parse(sfile).getroot()
t = root.xpath("//table[@class='yfnc_datamodoutline1']")[0]
trs=t.xpath(".//tr")
for  i, tr  in  enumerate(trs):
        print (i, len(tr),tr.text_content())

the output is:
0 1 StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70
0.007.007.4531528.00A111022C000280004.35
0.004.654.7520121029.00A111022C000290003.80
0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35
0.000.340.354429339.00A111022C000390000.16
0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33
0.000.100.14218442.00A111022C000420000.08
0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
1 8 StrikeSymbolLastChgBidAskVolOpen Int
2 8 25.00A111022C0002500010.70 0.007.007.45315
3 8 28.00A111022C000280004.35 0.004.654.75201210
4 8 29.00A111022C000290003.80 0.003.954.05426425
5 8 30.00A111022C000300003.110.013.253.355597
6 8 31.00A111022C000310002.700.162.662.717407
7 8 32.00A111022C000320002.110.082.122.172364
8 8 33.00A111022C000330001.870.311.651.7029568
9 8 34.00A111022C000340001.360.151.261.3026649
10 8 35.00A111022C000350000.960.040.940.9845477
11 8 36.00A111022C000360000.720.120.690.7243786
12 8 37.00A111022C000370000.510.030.490.52511,435
13 8 38.00A111022C000380000.35 0.000.340.3544293
14 8 39.00A111022C000390000.16 0.000.220.269149
15 8 40.00A111022C000400000.180.030.150.1853301
16 8 41.00A111022C000410000.33 0.000.100.142184
17 8 42.00A111022C000420000.08 0.000.060.103147
18 8 45.00A111022C000450000.10 0.000.010.05200243

i want to know  why  i=0  the  tr.text_content()'s  value  is :
StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70
0.007.007.4531528.00A111022C000280004.35
0.004.654.7520121029.00A111022C000290003.80
0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35
0.000.340.354429339.00A111022C000390000.16
0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33
0.000.100.14218442.00A111022C000420000.08
0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
it's  strannge thing for me to understand.
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From flt.johnson at gmail.com  Sat Sep 24 00:58:58 2011
From: flt.johnson at gmail.com (Fletcher Johnson)
Date: Fri, 23 Sep 2011 21:58:58 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<mailman.1412.1316836724.27778.python-list@python.org>
Message-ID: <e78742d2-5933-4f0b-82b4-7799d8156e43@i28g2000yqn.googlegroups.com>

On Sep 23, 11:58?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Sep 23, 2011 at 8:36 PM, Fletcher Johnson <flt.john... at gmail.com> wrote:
> > The topic says it all:
> > Why is shutil named shutil? What does it stand for? This is just a
> > mild curiosity of mine.
>
> "sh" is short for "shell", in line with Unix convention, where the
> default shell is located at /bin/sh.http://en.wikipedia.org/wiki/Shell_(computing)http://en.wikipedia.org/wiki/Unix_shell
>
> "util" is short for "utilities".
>
> shutil is a utility module used to accomplish tasks which one often
> does when in the shell, such as copying, moving, or removing directory
> trees. But shutil (to my knowledge) is not implemented using shell
> commands or by running external programs, so it thus avoids a whole
> host of shell-related issues.
>
> It's not the best name, but what with backwards compatibility and all,
> it's unlikely to change any time soon.
>
> Cheers,
> Chris
> --http://rebertia.com

I had a hunch it might have been that.


From atherun at gmail.com  Sat Sep 24 02:00:34 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 23:00:34 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<pan.2011.09.23.17.47.20.100000@nowhere.com>
	<2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>
	<mailman.1410.1316829803.27778.python-list@python.org>
Message-ID: <15570090-f674-46e6-8c2e-747b68da5672@n12g2000yqh.googlegroups.com>

On Sep 23, 7:03?pm, Matt Joiner <anacro... at gmail.com> wrote:
> how do you get the call stacks like this?
>
>
>
>
>
>
>
> On Sat, Sep 24, 2011 at 3:59 AM, Atherun <athe... at gmail.com> wrote:
> > On Sep 23, 10:47?am, Nobody <nob... at nowhere.com> wrote:
> >> On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:
> >> >> kernel32.dll!WaitForSingleObject+0x12
> >> >> python26.dll!_Py_svnversion+0xcf8
>
> >> > I haven't a clue how this happens. _Py_svnversion just returns a string:
>
> >> In retrospect, I think that's a red herring. 0xcf8 seems like too large an
> >> offset for such a small function. I think that it's more likely to be in a
> >> non-exported function, and _Py_svnversion just happens to be the last
> >> exported symbol prior to that point in the code.
>
> > I have the call stacks for each python thread running up until the
> > dead lock:
>
> > # ThreadID: 992
> > ?out, err = proc.communicate("change: new\ndescription: %s
> > \n"%changelistDesc)
> > File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> > communicate
> > ?return self._communicate(input)
> > File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> > _communicate
> > ?stdout_thread.join()
> > File: "c:\src\extern\python\lib\threading.py", line 637, in join
> > ?self.__block.wait()
> > File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> > ?waiter.acquire()
>
> > # ThreadID: 5516
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\extern\python\lib\threading.py", line 477, in run
> > ?self.__target(*self.__args, **self.__kwargs)
> > File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> > _readerthread
> > ?buffer.append(fh.read())
>
> > # ThreadID: 2668
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 69, in
> > run
> > ?self.stacktraces()
> > File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 86, in
> > stacktraces
> > ?fout.write(stacktraces())
> > File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 26, in
> > stacktraces
> > ?for filename, lineno, name, line in traceback.extract_stack(stack):
>
> > # ThreadID: 3248
> > ?out, err = proc.communicate("change: new\ndescription: %s
> > \n"%changelistDesc)
> > File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> > communicate
> > ?return self._communicate(input)
> > File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> > _communicate
> > ?stdout_thread.join()
> > File: "c:\src\extern\python\lib\threading.py", line 637, in join
> > ?self.__block.wait()
> > File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> > ?waiter.acquire()
>
> > # ThreadID: 7700
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\extern\python\lib\threading.py", line 477, in run
> > ?self.__target(*self.__args, **self.__kwargs)
> > File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> > _readerthread
> > ?buffer.append(fh.read())
>
> > # ThreadID: 8020
> > ?out, err = proc.communicate("change: new\ndescription: %s
> > \n"%changelistDesc)
> > File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> > communicate
> > ?return self._communicate(input)
> > File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> > _communicate
> > ?stdout_thread.join()
> > File: "c:\src\extern\python\lib\threading.py", line 637, in join
> > ?self.__block.wait()
> > File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> > ?waiter.acquire()
>
> > # ThreadID: 4252
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\extern\python\lib\threading.py", line 477, in run
> > ?self.__target(*self.__args, **self.__kwargs)
> > File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> > _readerthread
> > ?buffer.append(fh.read())
>
> > The StackTracer thread freezes trying to update my output file, and
> > yes I'm trying to 3 tasks in parallel which each one starts by
> > creating a changelist in perforce. ?This is just an easy repro case
> > for me, it happens with commands other then p4. ?This almost looks
> > like a threading issue more then the output deadlock.
> > --
> >http://mail.python.org/mailman/listinfo/python-list

I found the code for it here:
http://code.activestate.com/recipes/577334-how-to-debug-deadlocked-multi-threaded-programs/

There is some bugs in the code given but its pretty straight forward
to fix it.


From __peter__ at web.de  Sat Sep 24 02:48:29 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 24 Sep 2011 08:48:29 +0200
Subject: can't load an script from html...
References: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>
Message-ID: <j5jufp$fva$1@dough.gmane.org>

Ricardo wrote:

> Hi everyone
> I'm trying to use the cgi library to create a python script and loading it
> from a web page. I have already done the necessary imports, and the
> default commands to receive data from "html" are written too. The final
> version is something like this:
> 
> #!/usr/bin/python
> 
> import subprocess
> import cgi
> import cgitb
> 
> cgitb.enable()
> 
> input = cgi.FieldStorage()
> 
> ?. my code (do something with input)?.
> 
> 
> #printing the response
> 
> print "Content-Type: text/html"
> print
> print "<TITLE>My title:</TITLE>"
> print "</HEAD>"
> print "<BODY>"
> print ?.. bla bla ?
> print "%s"%theoutput
> print "</BODY>"
> 
> Besides, my call from my index.html is like this:
> 
>  <form action="/scripts/python_script.py" method="post">
>       <input name="inid" type="text" size="20" class="input" /><br/><br/>
>         <input type="submit" value="accept"  class="button"/>
>  </form>
> 
> well, the thing is that when i do the call from the browser:
> 
> http://localhost/index.html
>            |
>           V
> put the data and click on the "accept" button
>            |
>           V
> http:/localhost/scripts/python_script.py
> 
> I only get the python_script.py as a plain test by response (the script
> printed on my browser). I have already changed the permissions for
> python_script.py. I have checked the import cgi,cgitb in the python shell
> (i am using v2.7) and they work fine. So, i don't know what it is going
> wrong here.
> 
> A little help please? any idea?

Is your webserver configured to allow cgi scripts? In the scripts directory? 
For Apache see

http://httpd.apache.org/docs/current/howto/cgi.html

Python also comes with a CGI Server. A quick-and-dirty setup goes like this:

$ cat cgi-bin/script.py
#!/usr/bin/python
# -*- coding: utf-8 -*-

import cgi
import cgitb

cgitb.enable()

input = cgi.FieldStorage()

print "Content-Type: text/html"
print
print "<TITLE>My title:</TITLE>"
print "</HEAD>"
print "<BODY>"
print "Hello world"
print "</BODY>"
$ chmod a+x cgi-bin/script.py
$ python -m CGIHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...

If you then point your browser to http://localhost:8000/cgi-bin/script.py 
you should see 

Hello world 

in the browser and (something like)

localhost - - [24/Sep/2011 08:41:27] "GET /cgi-bin/script.py HTTP/1.1" 200 -

in the shell. Note that the script must be in cgi-bin (or htbin) unless you 
start the server with a custom script that modifies 
CGIHTTPRequestHandler.cgi_directories accordingly.



From steve+comp.lang.python at pearwood.info  Sat Sep 24 02:55:18 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 16:55:18 +1000
Subject: random.randint() slow, esp in Python 3
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
Message-ID: <4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> On Fri, Sep 23, 2011 at 4:14 AM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> What makes you think it's in C? I don't have Python 3.3a, but in 3.2 the
>> random module is mostly Python. There is an import of _random, which
>> presumably is in C, but it doesn't have a randint method:
> 
> True. It seems to be defined in cpython/lib/random.py as a reference
> to randrange, which does a pile of error checking and calls
> _randbelow... which does a whole lot of work as well as calling
> random(). Guess I should have checked the code before asking!
> 
> There's probably good reasons for using randint(), 

If you want unbiased, random (or at least pseudo-random) integers chosen
from an uniform distribution with proper error checking, you should use
randint or randrange.


> but if you just 
> want a pile of more-or-less random integers, int(random.random()*top)
> is the best option.

"I only need random-ish ints, but I need 'em yesterday!!!"

If you want biased, not-quite-uniformly distributed integers with no error
checking, then the above will save you a few nanoseconds per call. So if
your application needs a million such ints, you might save a full five
seconds or so. Sounds like premature optimization to me, but what do I
know? If you have an application where the quality of randomness is
unimportant and generating random ints is a genuine performance bottleneck,
then go right ahead.



>> I'm not seeing any significant difference in speed between 2.6 and 3.2:
>>
>> [steve at sylar ~]$ python2.6 -m timeit -s "from random import
>> randint" "randint(0, 1000000)"
>> 100000 loops, best of 3: 4.29 usec per loop
>>
>> [steve at sylar ~]$ python3.2 -m timeit -s "from random import
>> randint" "randint(0, 1000000)"
>> 100000 loops, best of 3: 4.98 usec per loop
> 
> That might be getting lost in the noise. Try the list comp that I had 
> above and see if you can see a difference - or anything else that
> calls randint that many times.

If you want to measure the speed of randint, you should measure the speed of
randint. That's what the timeit call does: it calls randint 100000 times.

You can't measure the speed of:

[random.randint(0,sz*10-1) for i in range(sz)]

and draw conclusions about randint alone. Roughly speaking, you are
measuring the time taken to:

lookup range
lookup sz, twice
call range, possibly generating a massive list
iterate over the list/range object
lookup random
lookup random.randint
multiply sz by 10 and subtract 1
build a list of the results, repeatedly resizing it as you go

(in no particular order)

There is MUCH more noise in your suggestion, not my version. But for what
it's worth, I get these results:

[steve at sylar ~]$ python3.2 -m timeit -s "import random" -s "sz =
1000000" "[random.randint(0,sz*10-1) for i in range(sz)]"
10 loops, best of 3: 6.09 sec per loop
[steve at sylar ~]$ python2.6 -m timeit -s "import random" -s "sz =
1000000" "[random.randint(0,sz*10-1) for i in range(sz)]"
10 loops, best of 3: 4.67 sec per loop

So Python 3.2 is about 30% slower for the whole mess. (I would, however,
give little confidence in those results: at 4-6 seconds per loop, I expect
that OS-level noise will be significant.)

For what (little) it's worth, it seems that Python 3.2 should be a bit
faster than 2.6, at least if you consider the Pystone benchmark to mean
anything.

http://www.levigross.com/post/2340736877/pystone-benchmark-on-2-6-2-7-3-2




> Performance-testing with a heapsort (and by the way, it's
> _ridiculously_ slower implementing it in Python instead of just
> calling a.sort(), but we all knew that already!) shows a similar
> difference in performance.

You do know that Python's heap implementation is written in C? Don't be
fooled by the heapq module being in Python. About 2/3rds of the way down,
there's a sneaky little trick:

# If available, use C implementation
try:
    from _heapq import *
except ImportError:
    pass


-- 
Steven



From Phillip.M.Feldman at gmail.com  Sat Sep 24 03:06:01 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 24 Sep 2011 00:06:01 -0700 (PDT)
Subject: multinomial combinations
Message-ID: <32503896.post@talk.nabble.com>


I wrote a small generator function that produces multinomial combinations. 
(Python's itertools module does ordinary combinations, but not multinomial
combinations).  The code essentially works, except that the the last
combination in each tuple is not enclosed in a nested tuple:

In [2]: x= multinomial_combinations(range(7),[2,1,2])

In [3]: x.next()
Out[3]: ((0, 1), (2,), 3, 4)

(The 3 and 4 should be enclosed in a nested tuple).

Any suggestions as to what I'm doing wrong will be appreciated.  My code
follows:

def multinomial_combinations(items, ns):

   if len(ns) == 1:
      for c in itertools.combinations(items, ns[0]):
         yield c

   else:
      for c_first in itertools.combinations(items, ns[0]):
         items_remaining= set(items) - set(c_first)
         for c_other in multinomial_combinations(items_remaining, ns[1:]):
            yield (c_first,) + c_other
-- 
View this message in context: http://old.nabble.com/multinomial-combinations-tp32503896p32503896.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From clp2 at rebertia.com  Sat Sep 24 03:35:42 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 24 Sep 2011 00:35:42 -0700
Subject: multinomial combinations
In-Reply-To: <32503896.post@talk.nabble.com>
References: <32503896.post@talk.nabble.com>
Message-ID: <CAMZYqRQKVgWjO8ZVyaL0+yQ80i+qVTJccVp8BHXC6k8fzf5eKw@mail.gmail.com>

On Sat, Sep 24, 2011 at 12:06 AM, Dr. Phillip M. Feldman
<Phillip.M.Feldman at gmail.com> wrote:
>
> I wrote a small generator function that produces multinomial combinations.
> (Python's itertools module does ordinary combinations, but not multinomial
> combinations). ?The code essentially works, except that the the last
> combination in each tuple is not enclosed in a nested tuple:
>
> In [2]: x= multinomial_combinations(range(7),[2,1,2])
>
> In [3]: x.next()
> Out[3]: ((0, 1), (2,), 3, 4)
>
> (The 3 and 4 should be enclosed in a nested tuple).
>
> Any suggestions as to what I'm doing wrong will be appreciated. ?My code
> follows:
>
> def multinomial_combinations(items, ns):
>
> ? if len(ns) == 1:
> ? ? ?for c in itertools.combinations(items, ns[0]):
> ? ? ? ? yield c

FWIW, changing the base case to:

    if not ns:
        yield ()

appears to fix the issue. (Disclaimer: Have not done additional testing.)

Cheers,
Chris

> ? else:
> ? ? ?for c_first in itertools.combinations(items, ns[0]):
> ? ? ? ? items_remaining= set(items) - set(c_first)
> ? ? ? ? for c_other in multinomial_combinations(items_remaining, ns[1:]):
> ? ? ? ? ? ?yield (c_first,) + c_other


From arnodel at gmail.com  Sat Sep 24 03:43:17 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 08:43:17 +0100
Subject: multinomial combinations
In-Reply-To: <32503896.post@talk.nabble.com>
References: <32503896.post@talk.nabble.com>
Message-ID: <CAJ6cK1bH=zzWNTRU-k9w-Uev2oKUyGOV16gNMg1XkPmFLEw3xA@mail.gmail.com>

(sorry about the top posting)

Change yield c to yield (c,)

HTH

Arnaud

PS: you could also change the if ... To

If not ns:
    Yield ((),)
Else:
    ...
On Sep 24, 2011 8:06 AM, "Dr. Phillip M. Feldman" <
Phillip.M.Feldman at gmail.com> wrote:
>
> I wrote a small generator function that produces multinomial combinations.

> (Python's itertools module does ordinary combinations, but not multinomial
> combinations). The code essentially works, except that the the last
> combination in each tuple is not enclosed in a nested tuple:
>
> In [2]: x= multinomial_combinations(range(7),[2,1,2])
>
> In [3]: x.next()
> Out[3]: ((0, 1), (2,), 3, 4)
>
> (The 3 and 4 should be enclosed in a nested tuple).
>
> Any suggestions as to what I'm doing wrong will be appreciated. My code
> follows:
>
> def multinomial_combinations(items, ns):
>
> if len(ns) == 1:
> for c in itertools.combinations(items, ns[0]):
> yield c
>
> else:
> for c_first in itertools.combinations(items, ns[0]):
> items_remaining= set(items) - set(c_first)
> for c_other in multinomial_combinations(items_remaining, ns[1:]):
> yield (c_first,) + c_other
> --
> View this message in context:
http://old.nabble.com/multinomial-combinations-tp32503896p32503896.html
> Sent from the Python - python-list mailing list archive at Nabble.com.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
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From iamforufriends at gmail.com  Sat Sep 24 04:34:26 2011
From: iamforufriends at gmail.com (hot girl)
Date: Sat, 24 Sep 2011 01:34:26 -0700 (PDT)
Subject: want to meet a new girlfriend for free
Message-ID: <7f26bf3c-5fa9-4514-a5f3-0f4acbc57720@i9g2000yqe.googlegroups.com>

want to meet a new girlfriend for free

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas

http://tinyurl.com/3v24v6e


From steve+comp.lang.python at pearwood.info  Sat Sep 24 04:57:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 18:57:01 +1000
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>

Matt wrote:

> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins.

Mixins considered harmful:
http://www.artima.com/weblogs/viewpost.jsp?thread=246341
http://www.artima.com/weblogs/viewpost.jsp?thread=246483

Mixins are much too easy to abuse, but there are uses for them.

I have found mixins useful for testing. If I have a bunch of functions that
take mostly similar unit tests, I create a mixin for the common unit tests,
then apply them to the tests.

Suppose I have two functions, ham and spam, which are unrelated but do share
some common behaviours. Since they are unrelated, I don't want the spam
test suite to inherit from the ham test suite, or vice versa, but I don't
want to write the same tests multiple times. (Especially when I add cheese,
egg and tomato functions.) So I put the common behaviours in a mixin class:

class StandardTestMixin:
    def test_requires_one_argument(self):
        self.assertRaises(TypeError, self.func)
    def test_has_docstring(self):
        self.assertTrue(self.func.__doc__)

class TestHam(unittest.TestCase, StandardTestMixin):
    ...

class TestSpam(unittest.TestCase, StandardTestMixin):
    ...


In this case, I simply don't care that the use of a mixin implies that
TestHam is a StandardTestMixin. I treat that as an accident of
implementation: it makes no practical difference, since I write no code
that depends on isinstance(instance, StandardTestMixin).



[...]
> In terms of code, lets say we have the following classes:
> 
> class Animal
> class Yamlafiable
> class Cat(Animal, Yamlafiable)
> class Dog(Animal, Yamlafiable)
> 
> I've got an Animal that does animal things, a Cat that does cat things
> and a Dog that does dog things. I've also got a Yamlafiable class that
> does something clever to generically convert an object into Yaml in
> some way. Looking at these classes I can see that a Cat is an Animal,
> a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
> Yamlafiable? and a Cat is a Yamlafiable? Is that really true?

That depends on what you want.

Python says is that issubclass(Cat, Yamlafiable) will return True. The
*interpretation* of that fact is entirely up to you. If you want to
interpret it as meaning that cats are Yamlafiables, go right ahead. If you
want to interpret it as a technical result with no semantic meaning, that's
fine too. After all, just because "ram" in "programming" returns True
doesn't actually mean anything about male sheep and computing.

The map is not the territory, and object-oriented ancestor/descendant
relationships are not the same as real life relationships. It's a tool,
nothing more, and if the metaphor starts to creak at the edges, oh well, so
much for the metaphor.

In fact, even in real life, the ancestor/descendant metaphor creaks. What
should we make of bacteria which exchange DNA with other species of
bacteria? Which is the ancestor and which is the descendant? How about
symbionts like lichen? What about when we splice genes from one species
into another? So even in real life, there are multiple inheritance and
mixins.



> If my 
> objects are categorized correctly, in the correct inheritance
> hierarchy shouldn't that make more sense? Cats and Dogs aren't
> Yamlafiable, that doesn't define what they are, rather it defines
> something that they can do because of things that they picked up from
> their friend the Yamlafile.

The standard metaphor for inheritance in OOP doesn't include "learning
things from a friend". It is a very simple metaphor: everything is
either "is-a" or "has-a". If you inherit from a class, the is-a
relationship holds. If you don't want that, you can use composition
instead:

class Cat(Animal):
    def __init__(self, yamlifier):
        self.yamlifier = yamlifier
    def make_yaml(self):
        self.yamlifier.make_yaml(self, self.spam)

Now we say that a Cat has-a Yamlafiable.


> This is just a ridiculous example, but I think it is valid to say that
> these things shouldn't be limited to inherit functionality only from
> their parents, that they can pick other things up along the way as
> well. Which is easy to do, right?
> 
> Dog.something_new = something_new

And that works in Python. But the thing is, which would you rather write?

#1
class Dog(Animal, Yamlafiable):
    pass

or this?

#2
class Dog(Animal):
    pass

Dog.__dict__.update(Yamlafiable.__dict__)


But wait! The two aren't the same. There are quite big differences in
behaviour between inheritance and attribute injection:

* In the case of inheritance, attributes defined by Animal take 
  precedence over those defined by Yamlafiable. In the case of 
  injection, the opposite is the case.

* In the case of inheritance, attributes defined by Yamlafiable's
  superclasses are reachable. In the case of injection, they 
  aren't (at least not without more work).

* Inheritance is late-binding, injection is early-binding: if 
  you dynamically add a new method to Yamlafiable, Dog will 
  see the change in the first case but not the second.


That's not to say that one is right and the other is wrong. They're just
different. Use whichever tool you prefer.

Another option is straits:

http://www.artima.com/weblogs/viewpost.jsp?thread=246488



-- 
Steven



From chris at simplistix.co.uk  Sat Sep 24 05:27:07 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Sat, 24 Sep 2011 10:27:07 +0100
Subject: MailingLogger 3.5.0 Released!
Message-ID: <4E7DA26B.5090202@simplistix.co.uk>

I'm pleased to announce a new release of Mailinglogger.

Mailinglogger provides two handlers for the standard python
logging framework that enable log entries to be emailed either as the
entries are logged or as a summary at the end of the running process.

The handlers have the following features:

- customisable and dynamic subject lines for emails sent

- emails sent with a configurable headers for easy filtering

- flood protection to ensure the number of emails sent is not excessive

- support for SMTP servers that require authentication

- fully documented and tested

The only change for this release was to add an X-Log-Level header to 
emails sent. For MailingLogger, this is the level of the log message 
being emailed. For SummarisingLogger this is the highest level of any of 
the messages handled.

Full docs can be found here:

http://packages.python.org/mailinglogger/

For more information, please see:
http://www.simplistix.co.uk/software/python/mailinglogger
or
http://pypi.python.org/pypi/mailinglogger

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk





From ian.g.kelly at gmail.com  Sat Sep 24 05:38:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 24 Sep 2011 03:38:14 -0600
Subject: random.randint() slow, esp in Python 3
In-Reply-To: <4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
	<4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CALwzidm4KepCkwz1jrxiHVeyRSnvENi9Wd2_kKpVTChqD4EhcQ@mail.gmail.com>

On Sat, Sep 24, 2011 at 12:55 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> If you want unbiased, random (or at least pseudo-random) integers chosen
> from an uniform distribution with proper error checking, you should use
> randint or randrange.
>
>
>> but if you just
>> want a pile of more-or-less random integers, int(random.random()*top)
>> is the best option.
>
> "I only need random-ish ints, but I need 'em yesterday!!!"
>
> If you want biased, not-quite-uniformly distributed integers with no error
> checking, then the above will save you a few nanoseconds per call. So if
> your application needs a million such ints, you might save a full five
> seconds or so. Sounds like premature optimization to me, but what do I
> know? If you have an application where the quality of randomness is
> unimportant and generating random ints is a genuine performance bottleneck,
> then go right ahead.

Peeking under the hood, after all the error-checking and extra
features, randrange basically just does int(random.random() * top).
Any bias present in the latter will also be present in the former.

Cheers,
Ian


From pavlovevidence at gmail.com  Sat Sep 24 05:58:37 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 24 Sep 2011 02:58:37 -0700 (PDT)
Subject: Python Mixins
In-Reply-To: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <20110522.2658.1316858317611.JavaMail.geo-discussion-forums@prfb12>

On Thursday, September 22, 2011 2:14:39 PM UTC-7, Matt wrote:
[snip]
> class MyMixin(object):
>     def one_thing(self):
>         return "something cool"
> 
> @mixin(MyMixin)
> class MyClass(object):
>     pass
> 
> x = MyClass()
> x.one_thing() == 'something cool'
> x.__class__.__bases__ ==  (object,)
> 
> To me, this is much more concise. By looking at this I can tell what
> MyClass IS, who it's parents are and what else it can do. I'm very
> interested to know if there are others who feel as dirty as I do when
> using inheritance for mixins

Not me.  Inheritance perfectly encompasses the mixin relationship, and because inheritance is so thoroughly ingrained in Python, it makes sense not to create a completely different mechanism to share behavior just for the case of mixins.

I know that, as someone who reads code, I would rather coders stick to well-known mechanisms than to create their own ad hoc mechanisms that don't actually add any new capability.  Take your MyClass example above.  If you had stuck to inheritance I could have seen what classes all the behavior was implemented by listing the __bases__.  But since you used an ad hoc mechanism, now I have to track down where the hell that one_thing() method is coming from.

No mechanism is ever perfect, and Python's MI is very far from perfect, but sticking to well-known and understood methods is usually more important than whatever little improvement you can make.  (And it is little; best as I can tell, your main objection is that mixins make it harder to see what the "main" parent is.  I'd say that's a dubious justification to spring a new behavior-sharing mechanism on a reader.)


> or if there are other things that Python
> developers are doing to mix in functionality without using inheritance
> or if the general populous of the Python community disagrees with me
> and thinks that this is a perfectly valid use of inheritance.

I'd guess the majority just use inheritance, although I can't say I've seen enough code out there to gauge it.

But there is something else a lot of Pythonistas will do in many cases: just define regular functions.  In your example, instead of defining one_thing() as a method of a mixin, define it as a function.  Personally, I find that I almost never use mixins, though I have absolutely nothing against them and I use MI and metaclasses all the time.  It's just that for most things I'd use a mixin for, I find that one or two regular functions work perfectly well.


Carl Banks


From pavlovevidence at gmail.com  Sat Sep 24 06:23:11 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 24 Sep 2011 03:23:11 -0700 (PDT)
Subject: Python Mixins
In-Reply-To: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <16852897.463.1316859791599.JavaMail.geo-discussion-forums@prng5>

On Thursday, September 22, 2011 2:14:39 PM UTC-7, Matt wrote:
> In terms of code, lets say we have the following classes:
> 
> class Animal
> class Yamlafiable
> class Cat(Animal, Yamlafiable)
> class Dog(Animal, Yamlafiable)
> 
> I've got an Animal that does animal things, a Cat that does cat things
> and a Dog that does dog things. I've also got a Yamlafiable class that
> does something clever to generically convert an object into Yaml in
> some way. Looking at these classes I can see that a Cat is an Animal,
> a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
> Yamlafiable? and a Cat is a Yamlafiable? Is that really true?

Yes.

I hope you are not confusing Cats with cats.


> If my
> objects are categorized correctly, in the correct inheritance
> hierarchy shouldn't that make more sense? Cats and Dogs aren't
> Yamlafiable, that doesn't define what they are, rather it defines
> something that they can do because of things that they picked up from
> their friend the Yamlafile.

The whole point of OOP is that objects are defined by their behavior.  A Cat is whatever it can do.  A Dog is whatever it can do.  If a Cat is yamlafiable, then it's coorect to say that a Cat is a Yamlafible (even if a cat isn't).


Carl Banks


From enleverLesX_XXmcX at XmclavXeauX.com.invalid  Sat Sep 24 07:48:29 2011
From: enleverLesX_XXmcX at XmclavXeauX.com.invalid (Michel Claveau - MVP)
Date: Sat, 24 Sep 2011 13:48:29 +0200
Subject: pyWin build 216
References: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
Message-ID: <4e7dc38c$0$18801$ba4acef3@reader.news.orange.fr>

Hi!

Me, because some bugs in 216, I come back to 214...
(215 has another bugs).

@-salutations
-- 
MCi


From rosuav at gmail.com  Sat Sep 24 08:33:50 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 24 Sep 2011 22:33:50 +1000
Subject: random.randint() slow, esp in Python 3
In-Reply-To: <4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
	<4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmr9gGOrBba0j3icKyQ5bVNS6d68jYed8-x=JbVQZeWKOQ@mail.gmail.com>

On Sat, Sep 24, 2011 at 4:55 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Chris Angelico wrote:
>
> If you want unbiased, random (or at least pseudo-random) integers chosen
> from an uniform distribution with proper error checking, you should use
> randint or randrange.
>
> "I only need random-ish ints, but I need 'em yesterday!!!"

All I want is some data to sort, so that I can verify that my
implementation is doing the same thing in every language that I write
it in. Doesn't have to be casino-level purity of randomness.

> You can't measure the speed of:
>
> [random.randint(0,sz*10-1) for i in range(sz)]
>
> and draw conclusions about randint alone.

Sure, but by comparing the two lines of code (one with randint and one
with random()), the other aspects can be cancelled out.

> For what (little) it's worth, it seems that Python 3.2 should be a bit
> faster than 2.6, at least if you consider the Pystone benchmark to mean
> anything.
>
> http://www.levigross.com/post/2340736877/pystone-benchmark-on-2-6-2-7-3-2

That's what I would normally expect, that the new version outperforms
the old - regardless of the program and the context. Exceptions need
justification (as in the case of int/long vs just int - Py2 often
outperforms Py3 when all the numbers fit inside machine int).

> You do know that Python's heap implementation is written in C? Don't be
> fooled by the heapq module being in Python.

I didn't know, but it doesn't surprise me. But my purpose wasn't to
sort the integers, it was to play with a particular hand-rolled
implementation of a heap sort in multiple languages and make sure it
was producing consistent results.

ChrisA


From dickinsm at gmail.com  Sat Sep 24 08:53:41 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 05:53:41 -0700 (PDT)
Subject: random.randint() slow, esp in Python 3
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
	<4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1422.1316857125.27778.python-list@python.org>
Message-ID: <94662e3d-5551-4ead-a067-9a381a402b43@i28g2000yqn.googlegroups.com>

On Sep 24, 10:38?am, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Sat, Sep 24, 2011 at 12:55 AM, Steven D'Aprano
>
>
>
>
>
>
>
>
>
> <steve+comp.lang.pyt... at pearwood.info> wrote:
> > If you want unbiased, random (or at least pseudo-random) integers chosen
> > from an uniform distribution with proper error checking, you should use
> > randint or randrange.
>
> >> but if you just
> >> want a pile of more-or-less random integers, int(random.random()*top)
> >> is the best option.
>
> > "I only need random-ish ints, but I need 'em yesterday!!!"
>
> > If you want biased, not-quite-uniformly distributed integers with no error
> > checking, then the above will save you a few nanoseconds per call. So if
> > your application needs a million such ints, you might save a full five
> > seconds or so. Sounds like premature optimization to me, but what do I
> > know? If you have an application where the quality of randomness is
> > unimportant and generating random ints is a genuine performance bottleneck,
> > then go right ahead.
>
> Peeking under the hood, after all the error-checking and extra
> features, randrange basically just does int(random.random() * top).
> Any bias present in the latter will also be present in the former.
>
> Cheers,
> Ian

In Python 2.x that's true, and indeed randrange has some fairly bad
behaviour for large arguments ( see http://bugs.python.org/issue9025
).  In Python 3.2 and up, randrange is more careful:  it doesn't
introduce any extra bias beyond that already present in the random
source (Mersenne Twister).  If you look at the source, you'll see that
Python 2.x only calls _getrandbits for large arguments, while Python
3.2+ calls _getrandbits for *every* invocation of randrange.  (All
assuming that we're using the default MT random number generator.)
This may well explain the difference in timings observed by the OP.

--
Mark


From steve+comp.lang.python at pearwood.info  Sat Sep 24 09:53:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 23:53:26 +1000
Subject: Generating equally-spaced floats with least rounding error
Message-ID: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>

I'm trying to generate a sequence of equally-spaced numbers between a lower
and upper limit. Given arbitrary limits, what is the best way to generate a
list of equally spaced floats with the least rounding error for each point?

For example, suppose I want to divide the range 0 to 2.1 into 7 equal
intervals, then the end-points of each interval are:

(0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)

and I'd like to return the values in the brackets. Using Decimal or Fraction
is not an option, I must use floats. If the exact value isn't representable
as a float, I'm okay with returning the nearest possible float.

The width of each interval is:

width = (2.1 - 0.0)/7

The relevant points can be calculated in either of two methods:

#1 add multiples of the width to the starting value, 0.

#2 subtract multiples of width from the ending value, 2.1.

(Repeated addition or subtraction should be avoided, as it increases the
amount of rounding error.)

Mathematically the two are equivalent, but due to rounding, they may not be.
Here's a run using Python 3.2:

>>> [0.0 + i*width for i in range(8)]
[0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]

The 4th and 7th values have rounding errors, the rest are exact.


>>> [2.1 - (7-i)*width for i in range(8)]
[0.0, 0.30000000000000027, 0.6000000000000001, 0.9000000000000001,
1.2000000000000002, 1.5, 1.8, 2.1]

The 2nd, 3rd, 4th and 5th values have rounding errors. Note that the 7th
value is exact here, but not above.

Is there a way to pick between methods #1 and #2 (or some combination of the
two) without human intervention so as to minimise the rounding error? Or is
there some other way to generate equally-spaced floats? My efforts at
googling have not been helpful.



-- 
Steven



From rosuav at gmail.com  Sat Sep 24 09:58:32 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 24 Sep 2011 23:58:32 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmr4=+c8qf+at+BuUZ4xbfDg5cBD4PMDmu1NBzM1NMhJ-g@mail.gmail.com>

On Sat, Sep 24, 2011 at 11:53 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> #1 add multiples of the width to the starting value, 0.
>
> #2 subtract multiples of width from the ending value, 2.1.

#3, go half and half - generate the lower half by adding to the lower
bound, and the upper half by subtracting from the upper bound. Not
sure if it'll help or not but it might be worth a shot.

ChrisA


From vlastimil.brom at gmail.com  Sat Sep 24 10:17:40 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sat, 24 Sep 2011 16:17:40 +0200
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <CAPTjJmr4=+c8qf+at+BuUZ4xbfDg5cBD4PMDmu1NBzM1NMhJ-g@mail.gmail.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<CAPTjJmr4=+c8qf+at+BuUZ4xbfDg5cBD4PMDmu1NBzM1NMhJ-g@mail.gmail.com>
Message-ID: <CAHzaPEM15_Od+yFqhRjyk39iN3YVWvfybWnX1KSw3qEWwOOzPw@mail.gmail.com>

2011/9/24 Chris Angelico <rosuav at gmail.com>:
> On Sat, Sep 24, 2011 at 11:53 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> #1 add multiples of the width to the starting value, 0.
>>
>> #2 subtract multiples of width from the ending value, 2.1.
>
> #3, go half and half - generate the lower half by adding to the lower
> bound, and the upper half by subtracting from the upper bound. Not
> sure if it'll help or not but it might be worth a shot.
>
> ChrisA
> --
Just a naive way:
#4 compute the values in both directions and use the average of the
results (of, course, given, there isn't a better way to distinguish
the values showing rounding errors automatically).

(I guess dealing manually with values obtained by .as_integer_ratio()
doesn't count as pure float operation...)

   vbr


From arnodel at gmail.com  Sat Sep 24 10:18:44 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 15:18:44 +0100
Subject: Generating equally-spaced floats with least rounding error
Message-ID: <CAJ6cK1YiOei8AcrbMpRTwake0ZTZB8rQVUMSWg7WLYS-J+XYmg@mail.gmail.com>

On Sep 24, 2011 2:59 PM, "Chris Angelico" <rosuav at gmail.com> wrote:
>
> On Sat, Sep 24, 2011 at 11:53 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
> > #1 add multiples of the width to the starting value, 0.
> >
> > #2 subtract multiples of width from the ending value, 2.1.
>
> #3, go half and half - generate the lower half by adding to the lower
> bound, and the upper half by subtracting from the upper bound. Not

#4 the barycentric approach.

    ((n-i)*a + i*b)/n for i in range(n+1)

Gives you n+1 equally spaced values between a and b inclusive

Arnaud
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From mwilson at the-wire.com  Sat Sep 24 10:26:08 2011
From: mwilson at the-wire.com (Mel)
Date: Sat, 24 Sep 2011 10:26:08 -0400
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5kp9v$q3d$1@speranza.aioe.org>

Steven D'Aprano wrote:

> I'm trying to generate a sequence of equally-spaced numbers between a
> lower and upper limit. Given arbitrary limits, what is the best way to
> generate a list of equally spaced floats with the least rounding error for
> each point?
> 
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
> 
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
> 
> and I'd like to return the values in the brackets. Using Decimal or
> Fraction is not an option, I must use floats. If the exact value isn't
> representable as a float, I'm okay with returning the nearest possible
> float.
> 
> The width of each interval is:
> 
> width = (2.1 - 0.0)/7
> 
> The relevant points can be calculated in either of two methods:
> 
> #1 add multiples of the width to the starting value, 0.
> 
> #2 subtract multiples of width from the ending value, 2.1.
> 
> (Repeated addition or subtraction should be avoided, as it increases the
> amount of rounding error.)
> 
> Mathematically the two are equivalent, but due to rounding, they may not
> be. Here's a run using Python 3.2:
> 
>>>> [0.0 + i*width for i in range(8)]
> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
> 
> The 4th and 7th values have rounding errors, the rest are exact.
> 
> 
>>>> [2.1 - (7-i)*width for i in range(8)]
> [0.0, 0.30000000000000027, 0.6000000000000001, 0.9000000000000001,
> 1.2000000000000002, 1.5, 1.8, 2.1]
> 
> The 2nd, 3rd, 4th and 5th values have rounding errors. Note that the 7th
> value is exact here, but not above.
> 
> Is there a way to pick between methods #1 and #2 (or some combination of
> the two) without human intervention so as to minimise the rounding error?
> Or is there some other way to generate equally-spaced floats? My efforts
> at googling have not been helpful.

When I've done this with ints (usually in small embedded systems) I've 
always preferred

low_limit + (total_width * i) / intervals

since it does the rounding on the biggest numbers where proportional error 
will be least, and it's guaranteed to hit the low_limit and high_limit 
exactly (as exactly as they can be represented, anyway.)

	Mel.



From lists at cheimes.de  Sat Sep 24 10:56:59 2011
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 24 Sep 2011 16:56:59 +0200
Subject: Python 2.5 zlib trouble
In-Reply-To: <78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
Message-ID: <j5kr3r$fgr$1@dough.gmane.org>

Am 23.09.2011 23:34, schrieb Jesramz:
> Im running on Ubuntu Natty and I am not running a self-compiled
> install, its a regular release. 

Ubuntu Natty doesn't come with Python 2.5. How did you install Python
2.5 on Natty? If you used some sort of installer or 3rd party
repository, there is a big chance that the installer doesn't understand
multiarch.

Christian



From dickinsm at gmail.com  Sat Sep 24 11:17:49 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 08:17:49 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>

On Sep 24, 2:53?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> I'm trying to generate a sequence of equally-spaced numbers between a lower
> and upper limit. Given arbitrary limits, what is the best way to generate a
> list of equally spaced floats with the least rounding error for each point?
>
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
>
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>
> and I'd like to return the values in the brackets. Using Decimal or Fraction
> is not an option, I must use floats. If the exact value isn't representable
> as a float, I'm okay with returning the nearest possible float.

Can you explain why you're constrained not to use Fraction?  Speed?

Using Fraction for intermediate calculations actually works perfectly
for this, since conversions from float to Fraction are exact, while
conversions from Fraction to float are correctly rounded.  So if
you're using Python, you're not too bothered about efficiency, and you
want provably correctly-rounded results, why not use Fraction?

>>> from fractions import Fraction
>>> start, stop, n = 0.0, 2.1, 7
>>> [float(Fraction(start) + i * (Fraction(stop) - Fraction(start)) / n) for i in range(n+1)]
[0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]

--
Mark



From steve+comp.lang.python at pearwood.info  Sat Sep 24 12:46:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 02:46:39 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
Message-ID: <4e7e0971$0$30000$c3e8da3$5496439d@news.astraweb.com>

Mark Dickinson wrote:

> On Sep 24, 2:53?pm, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
>> I'm trying to generate a sequence of equally-spaced numbers between a
>> lower and upper limit. Given arbitrary limits, what is the best way to
>> generate a list of equally spaced floats with the least rounding error
>> for each point?
>>
>> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
>> intervals, then the end-points of each interval are:
>>
>> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>>
>> and I'd like to return the values in the brackets. Using Decimal or
>> Fraction is not an option, I must use floats. If the exact value isn't
>> representable as a float, I'm okay with returning the nearest possible
>> float.
> 
> Can you explain why you're constrained not to use Fraction?  Speed?

Speed is important, but secondary to correctness. To be honest, I never even
thought of using fractions as an intermediate result -- I was thinking of
generating lists of Fractions. I think I can use this approach.

But out of curiosity, how would you do it using nothing but floats? Is there
a way?



-- 
Steven



From dickinsm at gmail.com  Sat Sep 24 12:55:35 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 09:55:35 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0971$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <44c72615-2455-469c-964f-6aacedeb705f@d17g2000yqa.googlegroups.com>

On Sep 24, 5:46?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Speed is important, but secondary to correctness. To be honest, I never even
> thought of using fractions as an intermediate result -- I was thinking of
> generating lists of Fractions. I think I can use this approach.

Speed could be improved greatly by using integer arithmetic (with some
help from the float.as_integer_ratio method) instead of using Fraction
directly, though it would require writing quite a lot more code;
Fraction's many and slow gcd calls for normalization are a problem
here, and since all denominators will be powers of 2 they're largely
unnecessary.

> But out of curiosity, how would you do it using nothing but floats? Is there
> a way?

Hmm.  Beyond writing my own multiple-precision integer library using
floats as the base type, I can't think of anything obvious. :-)

--
Mark


From steve+comp.lang.python at pearwood.info  Sat Sep 24 13:01:47 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 03:01:47 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
Message-ID: <4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>

Mark Dickinson wrote:

> Using Fraction for intermediate calculations actually works perfectly
> for this, since conversions from float to Fraction are exact, while
> conversions from Fraction to float are correctly rounded.  So if
> you're using Python, you're not too bothered about efficiency, and you
> want provably correctly-rounded results, why not use Fraction?
> 
>>>> from fractions import Fraction
>>>> start, stop, n = 0.0, 2.1, 7
>>>> [float(Fraction(start) + i * (Fraction(stop) - Fraction(start)) / n)
>>>> [for i in range(n+1)]
> [0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]


Ah, I knew it was too easy!

>>> from fractions import Fraction as F
>>> start, stop, n = 1, 3.1, 7
>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
[1.0, 1.3, 1.6, 1.9000000000000001, 2.2, 2.5, 2.8000000000000003, 3.1]
>>>
>>> start, stop, n = -1, 1.1, 7
>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
[-1.0, -0.7, -0.39999999999999997, -0.09999999999999996,
0.20000000000000004, 0.5000000000000001, 0.8, 1.1]



-- 
Steven



From rosuav at gmail.com  Sat Sep 24 13:03:14 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 03:03:14 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <j5kp9v$q3d$1@speranza.aioe.org>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<j5kp9v$q3d$1@speranza.aioe.org>
Message-ID: <CAPTjJmqGfi8rdYFYMSJMLv41CTah2P9eU1cgev6ZMeoz_Oz1nQ@mail.gmail.com>

On Sun, Sep 25, 2011 at 12:26 AM, Mel <mwilson at the-wire.com> wrote:
> low_limit + (total_width * i) / intervals
>

Definite improvement, if the range is comparatively small. Multiply
first, then divide.

ChrisA


From rosuav at gmail.com  Sat Sep 24 13:19:34 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 03:19:34 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmq19R5fJzCzUh9uRBsOzDRib+joF1C5S4dj4RQELFYRMw@mail.gmail.com>

On Sun, Sep 25, 2011 at 3:01 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Mark Dickinson wrote:
>
>> Using Fraction for intermediate calculations actually works perfectly
>> for this, since conversions from float to Fraction are exact, while
>> conversions from Fraction to float are correctly rounded. ?So if
>> you're using Python, you're not too bothered about efficiency, and you
>> want provably correctly-rounded results, why not use Fraction?
>>
> Ah, I knew it was too easy!

Try using Fraction for the start and stop too:
>>> from fractions import Fraction as F
>>> start,stop,n = F(0),F(21,10),7
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8, 1.1]

(Tested in Py 3.2 for Win)

ChrisA


From passiday at gmail.com  Sat Sep 24 13:31:21 2011
From: passiday at gmail.com (Passiday)
Date: Sat, 24 Sep 2011 10:31:21 -0700 (PDT)
Subject: Suggested coding style
Message-ID: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>

Hello,

I have started to code random stuff in Python only recently, still
lots to learn. So please bear with me if my question sounds like rant.

I have been coding in many other languages, most of the time it was
Java and C#. I don't like the function mess of PHP (ie, loads and
loads of functions without any namespaces etc), but I'd like to think
that Python is different.

In my brief coding experience I have stumbled upon Python zfill(width)
method, and I thought, really, do you have to include such a narrow-
purpose method in the basic method set? Perhaps there are more such
methods that are nice when you need them, but then again, you don't
put all the possible methods in the standard set.

Perhaps there is reason such method is in the basic library, and my
complaints are unbased? Or, perhaps the language is on course to bloat
out and get filled with tens and hundreds of special-purpose methods
that render the language structure chaotic?

Passiday


From dickinsm at gmail.com  Sat Sep 24 14:23:21 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 11:23:21 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <d133b3b9-d3d8-444a-ba8c-b372df7cdcd0@g29g2000yqh.googlegroups.com>

On Sep 24, 6:01?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Ah, I knew it was too easy!
>
> >>> from fractions import Fraction as F
> >>> start, stop, n = 1, 3.1, 7
> >>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
>
> [1.0, 1.3, 1.6, 1.9000000000000001, 2.2, 2.5, 2.8000000000000003, 3.1]

I believe that's still giving correctly-rounded results.  Note that
the stop value of 3.1 isn't exactly 3.1 here:  it's

    3.100000000000000088817841970012523233890533447265625

So the 4th value above is the closest float to 4/7 * 1.0 + 3/7 *
3.100000000000000088817841970012523233890533447265625.

--
Mark



From rick.mansilla at gmail.com  Sat Sep 24 14:50:26 2011
From: rick.mansilla at gmail.com (Ricardo Mansilla)
Date: Sat, 24 Sep 2011 13:50:26 -0500
Subject: Python-list Digest, Vol 96, Issue 137
In-Reply-To: <mailman.6665.1316848053.27777.python-list@python.org>
References: <mailman.6665.1316848053.27777.python-list@python.org>
Message-ID: <201109241350.27066.rick.mansilla@gmail.com>

On Saturday 24 September 2011 01:48:29 you wrote:
> Ricardo wrote:
> > Hi everyone
> > I'm trying to use the cgi library to create a python script and loading
> > it from a web page. I have already done the necessary imports, and the
> > default commands to receive data from "html" are written too. The final
> > version is something like this:
> > 
> > #!/usr/bin/python
> > 
> > import subprocess
> > import cgi
> > import cgitb
> > 
> > cgitb.enable()
> > 
> > input = cgi.FieldStorage()
> > 
> > ?. my code (do something with input)?.
> > 
> > 
> > #printing the response
> > 
> > print "Content-Type: text/html"
> > print
> > print "<TITLE>My title:</TITLE>"
> > print "</HEAD>"
> > print "<BODY>"
> > print ?.. bla bla ?
> > print "%s"%theoutput
> > print "</BODY>"
> > 
> > Besides, my call from my index.html is like this:
> >  <form action="/scripts/python_script.py" method="post">
> >  
> >       <input name="inid" type="text" size="20" class="input" /><br/><br/>
> >       
> >         <input type="submit" value="accept"  class="button"/>
> >  
> >  </form>
> > 
> > well, the thing is that when i do the call from the browser:
> > 
> > http://localhost/index.html
> > 
> >           V
> > 
> > put the data and click on the "accept" button
> > 
> >           V
> > 
> > http:/localhost/scripts/python_script.py
> > 
> > I only get the python_script.py as a plain test by response (the script
> > printed on my browser). I have already changed the permissions for
> > python_script.py. I have checked the import cgi,cgitb in the python shell
> > (i am using v2.7) and they work fine. So, i don't know what it is going
> > wrong here.
> > 
> > A little help please? any idea?
> 
> Is your webserver configured to allow cgi scripts? In the scripts
> directory? For Apache see
> 
> http://httpd.apache.org/docs/current/howto/cgi.html
> 
> Python also comes with a CGI Server. A quick-and-dirty setup goes like
> this:
> 
> $ cat cgi-bin/script.py
> #!/usr/bin/python
> # -*- coding: utf-8 -*-
> 
> import cgi
> import cgitb
> 
> cgitb.enable()
> 
> input = cgi.FieldStorage()
> 
> print "Content-Type: text/html"
> print
> print "<TITLE>My title:</TITLE>"
> print "</HEAD>"
> print "<BODY>"
> print "Hello world"
> print "</BODY>"
> $ chmod a+x cgi-bin/script.py
> $ python -m CGIHTTPServer
> Serving HTTP on 0.0.0.0 port 8000 ...
> 
> If you then point your browser to http://localhost:8000/cgi-bin/script.py
> you should see
> 
> Hello world
> 
> in the browser and (something like)
> 
> localhost - - [24/Sep/2011 08:41:27] "GET /cgi-bin/script.py HTTP/1.1" 200
> -
> 
> in the shell. Note that the script must be in cgi-bin (or htbin) unless you
> start the server with a custom script that modifies
> CGIHTTPRequestHandler.cgi_directories accordingly.


Thanks a lot, for your answer. Yes, i can run scripts from /cgi-bin/. Actually 
I follow you example and it works really well. I didn't know at all about this 
CGI server. 
I am doing the hole thing over python now, it's nice. 
Thanks again.

-- 
(...)Also, since that same law states that any system able to prove its 
consistency to itself must be inconsistent; any mind that believes it can 
prove its own sanity is, therefore, insane.(...) 
Kurt G?del. 
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From python at mrabarnett.plus.com  Sat Sep 24 15:03:31 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 24 Sep 2011 20:03:31 +0100
Subject: Suggested coding style
In-Reply-To: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <4E7E2983.10506@mrabarnett.plus.com>

On 24/09/2011 18:31, Passiday wrote:
> Hello,
>
> I have started to code random stuff in Python only recently, still
> lots to learn. So please bear with me if my question sounds like rant.
>
> I have been coding in many other languages, most of the time it was
> Java and C#. I don't like the function mess of PHP (ie, loads and
> loads of functions without any namespaces etc), but I'd like to think
> that Python is different.
>
> In my brief coding experience I have stumbled upon Python zfill(width)
> method, and I thought, really, do you have to include such a narrow-
> purpose method in the basic method set? Perhaps there are more such
> methods that are nice when you need them, but then again, you don't
> put all the possible methods in the standard set.
>
> Perhaps there is reason such method is in the basic library, and my
> complaints are unbased? Or, perhaps the language is on course to bloat
> out and get filled with tens and hundreds of special-purpose methods
> that render the language structure chaotic?
>
Considering that Python has been around for 20 years, there's not much
bloat. Most of the risk of that was early on, when any interest in the
language might have been welcomed. Now that its use has grown, it can
be more choosy.

.zfill does have its uses:

 >>> "-1".rjust(4, "0")
'00-1'
 >>> "-1".zfill(4)
'-001'


From tim at akwebsoft.com  Sat Sep 24 15:10:48 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sat, 24 Sep 2011 11:10:48 -0800
Subject: Suggested coding style
In-Reply-To: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <20110924191048.GH19422@johnsons-web.com>

* Passiday <passiday at gmail.com> [110924 09:47]:
<...>
> I have been coding in many other languages, most of the time it was
> Java and C#. I don't like the function mess of PHP (ie, loads and
> loads of functions without any namespaces etc), but I'd like to think
> that Python is different.
  It is ... 

> In my brief coding experience I have stumbled upon Python zfill(width)
> method, and I thought, really, do you have to include such a narrow-
> purpose method in the basic method set? Perhaps there are more such
> methods that are nice when you need them, but then again, you don't
> put all the possible methods in the standard set.
  I think that you have raised an interesting question here. I've
  been coding in python for 9 years and I have never used it. 

> Perhaps there is reason such method is in the basic library, and my
> complaints are unbased? 

  It could be some sort of legacy. I imagine we will hear from some
  more senior pythonists on this matter.

> Or, perhaps the language is on course to bloat
> out and get filled with tens and hundreds of special-purpose methods
> that render the language structure chaotic?

  From my observance, python has developed with care and prudence. I
  have a feeling (instinctive of course), that Guido van Rossum
  is/was more likely to say 'no' to a request for a new
  implementation that Rasmus Lerdorf.

  MTCW
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From python at mrabarnett.plus.com  Sat Sep 24 15:34:36 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 24 Sep 2011 20:34:36 +0100
Subject: Suggested coding style
In-Reply-To: <20110924191048.GH19422@johnsons-web.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
Message-ID: <4E7E30CC.3040402@mrabarnett.plus.com>

On 24/09/2011 20:10, Tim Johnson wrote:
> * Passiday<passiday at gmail.com>  [110924 09:47]:
> <...>
>> I have been coding in many other languages, most of the time it was
>> Java and C#. I don't like the function mess of PHP (ie, loads and
>> loads of functions without any namespaces etc), but I'd like to think
>> that Python is different.
>    It is ...
>
>> In my brief coding experience I have stumbled upon Python zfill(width)
>> method, and I thought, really, do you have to include such a narrow-
>> purpose method in the basic method set? Perhaps there are more such
>> methods that are nice when you need them, but then again, you don't
>> put all the possible methods in the standard set.
>    I think that you have raised an interesting question here. I've
>    been coding in python for 9 years and I have never used it.
>
>> Perhaps there is reason such method is in the basic library, and my
>> complaints are unbased?
>
>    It could be some sort of legacy. I imagine we will hear from some
>    more senior pythonists on this matter.
>
The documentation says "New in version 2.2.2".

>> Or, perhaps the language is on course to bloat
>> out and get filled with tens and hundreds of special-purpose methods
>> that render the language structure chaotic?
>
>     From my observance, python has developed with care and prudence. I
>    have a feeling (instinctive of course), that Guido van Rossum
>    is/was more likely to say 'no' to a request for a new
>    implementation that Rasmus Lerdorf.
>




From arnodel at gmail.com  Sat Sep 24 15:54:28 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 20:54:28 +0100
Subject: Suggested coding style
In-Reply-To: <4E7E30CC.3040402@mrabarnett.plus.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<4E7E30CC.3040402@mrabarnett.plus.com>
Message-ID: <CAJ6cK1Y5UJPs3n8WmO2MEKUUR9uZWaa9bFjWAR4D1P3T3GhGsA@mail.gmail.com>

On 24 September 2011 20:34, MRAB <python at mrabarnett.plus.com> wrote:

>>> In my brief coding experience I have stumbled upon Python zfill(width)
>>> method,
[...]
>> ? It could be some sort of legacy. I imagine we will hear from some
>> ? more senior pythonists on this matter.
>>
> The documentation says "New in version 2.2.2".

But zfill has been in the string module for a lot longer.

-- 
Arnaud


From arnodel at gmail.com  Sat Sep 24 15:55:34 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 20:55:34 +0100
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAJ6cK1Yi0LC7f1KZjPjmMCcDiOTKnhSUxAT8dsMu5nzGT9nr=A@mail.gmail.com>

On 24 September 2011 18:01, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Mark Dickinson wrote:
>
>> Using Fraction for intermediate calculations actually works perfectly
>> for this, since conversions from float to Fraction are exact, while
>> conversions from Fraction to float are correctly rounded. ?So if
>> you're using Python, you're not too bothered about efficiency, and you
>> want provably correctly-rounded results, why not use Fraction?
>>
>>>>> from fractions import Fraction
>>>>> start, stop, n = 0.0, 2.1, 7
>>>>> [float(Fraction(start) + i * (Fraction(stop) - Fraction(start)) / n)
>>>>> [for i in range(n+1)]
>> [0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>
>
> Ah, I knew it was too easy!
>
>>>> from fractions import Fraction as F
>>>> start, stop, n = 1, 3.1, 7
>>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
> [1.0, 1.3, 1.6, 1.9000000000000001, 2.2, 2.5, 2.8000000000000003, 3.1]

>>> start, stop, n = 1, 3.1, 7
>>> [((n-i)*start + i*stop)/n for i in range(n+1)]
[1.0, 1.3, 1.5999999999999999, 1.9000000000000001, 2.2, 2.5,
2.8000000000000003, 3.1]

>>>> start, stop, n = -1, 1.1, 7
>>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
> [-1.0, -0.7, -0.39999999999999997, -0.09999999999999996,
> 0.20000000000000004, 0.5000000000000001, 0.8, 1.1]

>>> start, stop, n = -1, 1.1, 7
>>> [((n-i)*start + i*stop)/n for i in range(n+1)]
[-1.0, -0.7000000000000001, -0.39999999999999997,
-0.09999999999999996, 0.20000000000000004, 0.5, 0.8, 1.1]

On these examples, using fractions is no better than what I suggested
in my previous post.

-- 
Arnaud


From stefan-usenet at bytereef.org  Sat Sep 24 16:30:45 2011
From: stefan-usenet at bytereef.org (Stefan Krah)
Date: Sat, 24 Sep 2011 22:30:45 +0200
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <CAJ6cK1Yi0LC7f1KZjPjmMCcDiOTKnhSUxAT8dsMu5nzGT9nr=A@mail.gmail.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<CAJ6cK1Yi0LC7f1KZjPjmMCcDiOTKnhSUxAT8dsMu5nzGT9nr=A@mail.gmail.com>
Message-ID: <20110924203045.GA2014@sleipnir.bytereef.org>

Arnaud Delobelle <arnodel at gmail.com> wrote:
> >>>> start, stop, n = -1, 1.1, 7
> >>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
> > [-1.0, -0.7, -0.39999999999999997, -0.09999999999999996,
> > 0.20000000000000004, 0.5000000000000001, 0.8, 1.1]
> 
> >>> start, stop, n = -1, 1.1, 7
> >>> [((n-i)*start + i*stop)/n for i in range(n+1)]
> [-1.0, -0.7000000000000001, -0.39999999999999997,
> -0.09999999999999996, 0.20000000000000004, 0.5, 0.8, 1.1]
> 
> On these examples, using fractions is no better than what I suggested
> in my previous post.

Why not use Decimal if one needs exact endpoints? Something like:

def drange(start, stop, step=1):
    if (step == 0):
        raise ValueError("step must be != 0")
    with localcontext() as ctx:
        ctx.traps[Inexact] = True
        x = start
        cmp = -1 if step > 0 else 1
        while x.compare(stop) == cmp:
            yield float(x)
            x += step


>>> list(drange(Decimal(1), Decimal("3.1"), Decimal("0.3")))
[1.0, 1.3, 1.6, 1.9, 2.2, 2.5, 2.8]
>>> list(drange(Decimal(-1), Decimal("1.1"), Decimal("0.3")))
[-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8]
>>> list(drange(Decimal(-1), Decimal("1.1"), Decimal("0.1823612873")))
[-1.0, -0.8176387127, -0.6352774254, -0.4529161381, -0.2705548508, -0.0881935635, 0.0941677238, 0.2765290111, 0.4588902984, 0.6412515857, 0.823612873, 1.0059741603]
>>> list(drange(Decimal(-1), Decimal("1.1"), Decimal(1)/3))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 10, in drange
  File "/usr/lib/python3.2/decimal.py", line 1178, in __add__
    ans = ans._fix(context)
  File "/usr/lib/python3.2/decimal.py", line 1652, in _fix
    context._raise_error(Inexact)
  File "/usr/lib/python3.2/decimal.py", line 3836, in _raise_error
    raise error(explanation)
decimal.Inexact: None



Stefan Krah




From mateusz at loskot.net  Sat Sep 24 16:52:46 2011
From: mateusz at loskot.net (Mateusz Loskot)
Date: Sat, 24 Sep 2011 13:52:46 -0700 (PDT)
Subject: PyEval_EvalCodeEx return value
In-Reply-To: <3520ac5c-9e75-45b2-a4f1-fc29658bea4b@l4g2000vbv.googlegroups.com>
References: <4E786C42.3050309@loskot.net>
	<3520ac5c-9e75-45b2-a4f1-fc29658bea4b@l4g2000vbv.googlegroups.com>
Message-ID: <32503908.post@talk.nabble.com>



John Pinner-3 wrote:
> 
> I assume that you have read the documentation at
> http://docs.python.org/c-api/veryhigh.html,
> and I agree that it's sparse, but the entry for the next entry,
> PyEval_EvalCodeEx, tells you a little more, as does that for
> PyEval_EvalFrameEx.
> 

It does help, but only a bit.


John Pinner-3 wrote:
> 
> Obviously, it's returning a pointer to a PyObject, and Looking at the
> source code, that may be NULL, to throw an exception, or an execution
> frame, or a generator,etc, etc, depending on the code it's been given.
> I guess that you should be able to inspect the PyObject to see what it is.
> 

Yes, that's one possibility. I tried to investigate others.


John Pinner-3 wrote:
> 
> What I'm wondering is, why are you eval-ing code ? A favourite device
> of C programmers coming to Python (and mea culpa in the past), it's
> fraught with potential problems and even security risks, and is
> difficult to debug, and maybe you should be using introspection instead.
> 

My application accepts Python scripts from user and executes using embedded
Python interpreter.
So, I use this particular API.

Could you elaborate on the "using introspection"?


John Pinner-3 wrote:
> 
> And maybe you should be working in Python, and not C++ at this point,
> do the dynamic stuff in the language best suited, and then return to C++
> when needed.
> 

My application in C++ interacts with Python programs provided by users.
Depending on what these programs request, various PyObject objects are
created and returned back, etc.

I understand it's difficult to discuss it without long essays or without
providing the code, etc.
So, I can only discuss and investigate building blocks I use.
Anyway, thanks for your comments.

Best regards,

-----
-- 
Mateusz Loskot
http://mateusz.loskot.net
-- 
View this message in context: http://old.nabble.com/PyEval_EvalCodeEx-return-value-tp32501833p32503908.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From f.derainville at gmail.com  Sat Sep 24 16:54:16 2011
From: f.derainville at gmail.com (f.derainville at gmail.com)
Date: Sat, 24 Sep 2011 13:54:16 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <16897112.251.1316897656322.JavaMail.geo-discussion-forums@yqmw31>

>>> import numpy
>>> numpy.arange(0, 3, 0.3)
array([ 0. ,  0.3,  0.6,  0.9,  1.2,  1.5,  1.8,  2.1,  2.4,  2.7])


From rantingrick at gmail.com  Sat Sep 24 17:05:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 24 Sep 2011 14:05:36 -0700 (PDT)
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <210c9d0b-d0f0-4fec-9d7b-11ef32127d6e@q26g2000vby.googlegroups.com>

On Sep 22, 4:14?pm, Matt <mattj.morri... at gmail.com> wrote:
> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins. It makes everything
> extremely customizable and reusable. I think this is a very good
> practice to follow, however, in Python mixins are achieved by using
> (or perhaps misusing) inheritance and often multiple inheritance.

Have a look at this article also. Even though he uses java source code
anyone can follow along:

   http://berniesumption.com/software/inheritance-is-evil-and-must-be-destroyed/


From tim at akwebsoft.com  Sat Sep 24 17:09:35 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sat, 24 Sep 2011 13:09:35 -0800
Subject: Suggested coding style
In-Reply-To: <CAJ6cK1Y5UJPs3n8WmO2MEKUUR9uZWaa9bFjWAR4D1P3T3GhGsA@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<4E7E30CC.3040402@mrabarnett.plus.com>
	<CAJ6cK1Y5UJPs3n8WmO2MEKUUR9uZWaa9bFjWAR4D1P3T3GhGsA@mail.gmail.com>
Message-ID: <20110924210935.GI19422@johnsons-web.com>

* Arnaud Delobelle <arnodel at gmail.com> [110924 12:04]:
> On 24 September 2011 20:34, MRAB <python at mrabarnett.plus.com> wrote:
> 
> >>> In my brief coding experience I have stumbled upon Python zfill(width)
> >>> method,
> [...]
> >> ? It could be some sort of legacy. I imagine we will hear from some
> >> ? more senior pythonists on this matter.
> >>
> > The documentation says "New in version 2.2.2".
> 
> But zfill has been in the string module for a lot longer.
 :) Like I said. See timestamp.
 http://mail.python.org/pipermail/python-bugs-list/1999-July/000035.html
 I was coding C/C++ and ASM back then.... 

-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From tjreedy at udel.edu  Sat Sep 24 18:10:29 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 24 Sep 2011 18:10:29 -0400
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5lkgs$e4c$1@dough.gmane.org>

On 9/24/2011 9:53 AM, Steven D'Aprano wrote:
> I'm trying to generate a sequence of equally-spaced numbers between a lower
> and upper limit. Given arbitrary limits, what is the best way to generate a
> list of equally spaced floats with the least rounding error for each point?
>
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
>
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>
> and I'd like to return the values in the brackets. Using Decimal or Fraction
> is not an option, I must use floats. If the exact value isn't representable
> as a float, I'm okay with returning the nearest possible float.
>
> The width of each interval is:
>
> width = (2.1 - 0.0)/7

Calculating width is the fundamental problem. .3 cannot be exactly 
represented in binary, and higher multiples with multiply the error.

>
> The relevant points can be calculated in either of two methods:
>
> #1 add multiples of the width to the starting value, 0.
>
> #2 subtract multiples of width from the ending value, 2.1.
>
> (Repeated addition or subtraction should be avoided, as it increases the
> amount of rounding error.)
>
> Mathematically the two are equivalent, but due to rounding, they may not be.
> Here's a run using Python 3.2:
>
>>>> [0.0 + i*width for i in range(8)]
> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
>
> The 4th and 7th values have rounding errors, the rest are exact

No they are not. Their errors are just smaller and not visible with 16 
digits.

 >>> width = (2.1 - 0.0)/7
 >>> ['%20.18f' % x for x in [0.0 + i*width for i in range(8)]]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.899999999999999911', '1.199999999999999956', '1.500000000000000000', 
'1.799999999999999822', '2.100000000000000089']

On 9/24/2011 10:18 AM, Arnaud Delobelle wrote:
 >      ((n-i)*a + i*b)/n for i in range(n+1)

 >>> ['%20.18f' % x for x in [((7-i)*0.0 + i*2.1)/7 for i in range(8)]]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.900000000000000133', '1.199999999999999956', '1.500000000000000000', 
'1.800000000000000266', '2.100000000000000089']

In the two places where this disagrees with the previous result, I 
believe it is worse. The *0.0 adds nothing. You are still multiplying an 
inexactly represented 2.1 by increasingly large numbers. Even 7*2.1/7 is 
not exact!

My answer is the same as Mark's. Do exact calculation with fractions 
(whether using Fraction or not) and convert to float. I believe the 
least common multiple of a.as_integer_ratio[1], b.as_integer_ratio[1], 
and n is the common denominator needed to convert the numerators to a 
range() output. For the current problem, that is lcm(10,7) = 70.

The best you can do for this example is
 >>> ['%20.18f' % (i/10 ) for i in range(0, 22, 3)]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.900000000000000022', '1.199999999999999956', '1.500000000000000000', 
'1.800000000000000044', '2.100000000000000089']

Notice that the last place errors are all less than 50, so printing to 
16 places will make them appear 'exact'.

Without being fancy (to see than you can cancel 7), you get the same 
output with
 >>> ['%20.18f' % (i/70 ) for i in range(0, 148, 21)]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.900000000000000022', '1.199999999999999956', '1.500000000000000000', 
'1.800000000000000044', '2.100000000000000089']

In the two places where these disagree with the first (your original) 
they are *better*, with absolute error in the last places of 22 versus 
89 and 44 versus 178 for .9 and 1.8. The last place errors greater than 
50 gave you the 'inexact' answers in your post, and indeed, they are not 
the best possible.

-- 
Terry Jan Reedy



From rantingrick at gmail.com  Sat Sep 24 18:36:44 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 24 Sep 2011 15:36:44 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
Message-ID: <0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>

On Sep 23, 10:36?pm, Fletcher Johnson <flt.john... at gmail.com> wrote:
> The topic says it all:
> Why is shutil named shutil? What does it stand for? This is just a
> mild curiosity of mine.
> The shutil module for reference:http://docs.python.org/library/shutil.html#module-shutil

Because even after 20 freaking years of evolution Python "heads of
state" (or states of head) cannot be bi-partisan enough to agree on a
freaking File and/or path object; remind you of any "body" we know?


From rantingrick at gmail.com  Sat Sep 24 18:41:22 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 24 Sep 2011 15:41:22 -0700 (PDT)
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
	<4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <3baeef0c-1dbf-4067-a73e-d6bfbc059f17@5g2000yqo.googlegroups.com>

On Sep 24, 3:57?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:

> class StandardTestMixin:
> ? ? def test_requires_one_argument(self):
> ? ? ? ? self.assertRaises(TypeError, self.func)
> ? ? def test_has_docstring(self):
> ? ? ? ? self.assertTrue(self.func.__doc__)

And this is another example of why we need doc-string reforms. Here we
have a well know "pythonista" (for lack of better word) who needs to
write a test for doc-string inclusion because he refuses to get in the
habit of writing them. People, EVERY method and function MUST have a
doc-string! What is the purpose of having doc-strings if we are too
lazy to use them!




From jesus.ramirez.utexas at gmail.com  Sat Sep 24 19:08:21 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Sat, 24 Sep 2011 16:08:21 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
Message-ID: <2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>


I installed it from here: http://www.python.org/getit/releases/2.5.6/

What do you think a solution might be?



From benjamin.kaplan at case.edu  Sat Sep 24 19:33:35 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 24 Sep 2011 19:33:35 -0400
Subject: Python 2.5 zlib trouble
In-Reply-To: <2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
Message-ID: <CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>

On Sat, Sep 24, 2011 at 7:08 PM, Jesramz <jesus.ramirez.utexas at gmail.com> wrote:
>
> I installed it from here: http://www.python.org/getit/releases/2.5.6/
>
> What do you think a solution might be?
>

There is no binary installer on that page. That means you downloaded
the source code and compiled it yourself. Yes, you didn't patch it.
But it's still a self-compiled version of Python.

In order to get zlib in a self-compiled version of Python, you need to
install the appropriate -dev package. From a quick look at the
repository, I think it's zlib1g-dev but I'm not sure.

On Ubuntu, the development headers are in a different package than the
libraries themselves. The development headers aren't needed when
you're installing a binary that someone else compiled (for instance,
anything you get from the package manager) but are needed if you're
trying to build anything that uses the library. Since a good chunk of
the Python stdlib isn't actually necessary to run Python, you can
successfully build Python without getting a good chunk of the modules.
./configure will give you a list of the modules that won't get built
at the end of its output.


From python.list at tim.thechases.com  Sat Sep 24 19:36:56 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sat, 24 Sep 2011 18:36:56 -0500
Subject: Python Mixins
In-Reply-To: <3baeef0c-1dbf-4067-a73e-d6bfbc059f17@5g2000yqo.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>	<4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<3baeef0c-1dbf-4067-a73e-d6bfbc059f17@5g2000yqo.googlegroups.com>
Message-ID: <4E7E6998.80102@tim.thechases.com>

On 09/24/11 17:41, rantingrick wrote:
> On Sep 24, 3:57 am, Steven D'Aprano<steve
> +comp.lang.pyt... at pearwood.info>  wrote:
>
>> class StandardTestMixin:
>>      def test_requires_one_argument(self):
>>          self.assertRaises(TypeError, self.func)
>>      def test_has_docstring(self):
>>          self.assertTrue(self.func.__doc__)
>
> And this is another example of why we need doc-string reforms. Here we
> have a well know "pythonista" (for lack of better word) who needs to
> write a test for doc-string inclusion because he refuses to get in the
> habit of writing them. People, EVERY method and function MUST have a
> doc-string! What is the purpose of having doc-strings if we are too
> lazy to use them!

http://www.python.org/dev/peps/pep-0257/

"""
The aim of this PEP is to standardize the high-level structure of 
docstrings: what they should contain, and how to say it (without 
touching on any markup syntax within docstrings). The PEP 
contains conventions, not laws or syntax.
"""

You keep saying the word "MUST".  I do not think it means what 
you think it means.  Just for the record [1], [2], [3], [4] all 
in my first page of search Google search results.  Pot, meet 
kettle.

-tkc

[1]
http://mail.python.org/pipermail/python-list/2009-September/1220068.html

[2]
http://mail.python.org/pipermail//python-list/2011-July/1276021.html

[3]
http://mail.python.org/pipermail/python-list/2010-March/1237898.html

[4]
http://mail.python.org/pipermail/python-list/2010-June/1246305.html


From tjreedy at udel.edu  Sat Sep 24 20:31:06 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 24 Sep 2011 20:31:06 -0400
Subject: Python Mixins
In-Reply-To: <4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
	<4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5lsoh$o80$1@dough.gmane.org>

On 9/24/2011 4:57 AM, Steven D'Aprano wrote:

> Python says is that issubclass(Cat, Yamlafiable) will return True. The
> *interpretation* of that fact is entirely up to you. If you want to
> interpret it as meaning that cats are Yamlafiables, go right ahead. If you
> want to interpret it as a technical result with no semantic meaning, that's
> fine too. After all, just because "ram" in "programming" returns True
> doesn't actually mean anything about male sheep and computing.

Today's comics had a strip in which girl A suggests to girl B that they 
go to a disco to disco-ver someone interesting.

> In fact, even in real life, the ancestor/descendant metaphor creaks. What
> should we make of bacteria which exchange DNA with other species of
> bacteria?

That the human concept of 'species' does not really apply to bacteria.
And similarly, that the CompSci concept of 'class' may also not always 
fit what we want to model.

 > Which is the ancestor and which is the descendant? How about
> symbionts like lichen? What about when we splice genes from one species
> into another? So even in real life, there are multiple inheritance and
> mixins.

Good point.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep 24 20:40:36 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 24 Sep 2011 20:40:36 -0400
Subject: Why is the shutil module called shutil?
In-Reply-To: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
Message-ID: <j5ltac$qut$1@dough.gmane.org>

On 9/23/2011 11:36 PM, Fletcher Johnson wrote:
> The topic says it all:
> Why is shutil named shutil? What does it stand for? This is just a
> mild curiosity of mine.
> The shutil module for reference: http://docs.python.org/library/shutil.html#module-shutil

I think it would be nice if the doc explained. Feel free to open a doc 
issue to add '(sh-ell util-ities)' or something after "The shutil " and 
add me, terry.reedy, as nosy.

-- 
Terry Jan Reedy



From lists at cheimes.de  Sat Sep 24 20:51:28 2011
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 25 Sep 2011 02:51:28 +0200
Subject: Python 2.5 zlib trouble
In-Reply-To: <CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>	<mailman.1405.1316812862.27778.python-list@python.org>	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>	<mailman.1427.1316876233.27778.python-list@python.org>	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
Message-ID: <j5ltuh$u34$1@dough.gmane.org>

Am 25.09.2011 01:33, schrieb Benjamin Kaplan:
> There is no binary installer on that page. That means you downloaded
> the source code and compiled it yourself. Yes, you didn't patch it.
> But it's still a self-compiled version of Python.
> 
> In order to get zlib in a self-compiled version of Python, you need to
> install the appropriate -dev package. From a quick look at the
> repository, I think it's zlib1g-dev but I'm not sure.
> 
> On Ubuntu, the development headers are in a different package than the
> libraries themselves. The development headers aren't needed when
> you're installing a binary that someone else compiled (for instance,
> anything you get from the package manager) but are needed if you're
> trying to build anything that uses the library. Since a good chunk of
> the Python stdlib isn't actually necessary to run Python, you can
> successfully build Python without getting a good chunk of the modules.
> ../configure will give you a list of the modules that won't get built
> at the end of its output.

On recent Ubuntu and Debian versions, the dev packages aren't enough for
old versions of Python. Anything older than Python 2.7.2 requires a
tweak in order to make Python find the shared libraries. It's all
explained in my blog posting.

Debian's new multiarch features has broken Python's main setup.py
because it tries to find the libraries itself instead of relying on
ld.so and gcc. Barry has already fixed the issue for 2.7.2 and recent 3.2.

Christian

PS: Linux 3.x is going to cause trouble with older versions of Python,
too. Wanna know more? Have a look: http://lipyrary.blogspot.com/



From steve+comp.lang.python at pearwood.info  Sat Sep 24 22:13:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 12:13:26 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1439.1316894136.27778.python-list@python.org>
Message-ID: <4e7e8e47$0$29966$c3e8da3$5496439d@news.astraweb.com>

Arnaud Delobelle wrote:

> On these examples, using fractions is no better than what I suggested
> in my previous post.

I'm sorry, I can't see your previous post. Perhaps it isn't available on my
news provider?



-- 
Steven



From steve+comp.lang.python at pearwood.info  Sat Sep 24 22:36:42 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 12:36:42 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
Message-ID: <4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>

MRAB wrote:

> On 24/09/2011 20:10, Tim Johnson wrote:
>> * Passiday<passiday at gmail.com>  [110924 09:47]:
>> <...>
>>> I have been coding in many other languages, most of the time it was
>>> Java and C#. I don't like the function mess of PHP (ie, loads and
>>> loads of functions without any namespaces etc), but I'd like to think
>>> that Python is different.
>>    It is ...
>>
>>> In my brief coding experience I have stumbled upon Python zfill(width)
>>> method, and I thought, really, do you have to include such a narrow-
>>> purpose method in the basic method set? Perhaps there are more such
>>> methods that are nice when you need them, but then again, you don't
>>> put all the possible methods in the standard set.
>>    I think that you have raised an interesting question here. I've
>>    been coding in python for 9 years and I have never used it.
>>
>>> Perhaps there is reason such method is in the basic library, and my
>>> complaints are unbased?
>>
>>    It could be some sort of legacy. I imagine we will hear from some
>>    more senior pythonists on this matter.
>>
> The documentation says "New in version 2.2.2".

Which is about nine years old, so roughly half as old as Python itself. 
It's hardly a new feature.

Just because Passiday and Tim don't use zfill doesn't mean it's not useful 
to some people. Here are examples of it in use, or people asking how to 
format numbers with leading zeroes:

http://www.ruby-forum.com/topic/67378
http://stackoverflow.com/questions/134934/display-number-with-leading-zeros
http://stackoverflow.com/questions/733454/best-way-to-format-integer-as-string-with-leading-zeros
http://msdn.microsoft.com/en-us/library/dd260048.aspx
http://www.ozgrid.com/forum/showthread.php?t=64193&page=1

http://www.google.com/codesearch#algXCqBNNP0/utils/zip2rep.py&q=lang:%5Epython$%20zfill%20case:yes&ct=rc&cd=7

http://www.google.com/codesearch#Wnd3W7C0RPM/lives_guide.tar.bz2%7C0MIk12cLwTg/desub.py&q=lang:%5Epython$%20zfill%20case:yes

Padding numbers with leading zeroes is very common. I'm surprised that 
more languages don't make it a string method.



-- 
Steven



From jeanpierreda at gmail.com  Sat Sep 24 22:55:10 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sat, 24 Sep 2011 22:55:10 -0400
Subject: Suggested coding style
In-Reply-To: <4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>

> Padding numbers with leading zeroes is very common. I'm surprised that
> more languages don't make it a string method.

By making it a string method, instead of a function, we force all
implementations of strings to implement that method. That sort of
sucks, and it's a reason not to include it as a method. It can, after
all, be implemented as a function, and in doing so (with the
appropriate operator overloading) that function could work with
multiple implementations of strings. Instead any implementation of a
string must implement that method. That's a waste.

Of course, one could argue that there are very few string
implementations. On the other hand, there were three in the stdlib in
2.x, and there are other concepts of strings (like ropes) that are
more efficient for different use-cases. The third string in the stdlib,
mmap, didn't even bother implementing the full string interface. It's
just so damned big. (Also some methods didn't apply, like zfill, but
hey!)

At the very least, it's sort of ugly from my perspective to tack on
trivial things like this to be string methods.

But sure, yeah, as a bonus you get to do fewer imports. That's pretty
great too, I guess.

Devin

On Sat, Sep 24, 2011 at 10:36 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> MRAB wrote:
>
>> On 24/09/2011 20:10, Tim Johnson wrote:
>>> * Passiday<passiday at gmail.com> ?[110924 09:47]:
>>> <...>
>>>> I have been coding in many other languages, most of the time it was
>>>> Java and C#. I don't like the function mess of PHP (ie, loads and
>>>> loads of functions without any namespaces etc), but I'd like to think
>>>> that Python is different.
>>> ? ?It is ...
>>>
>>>> In my brief coding experience I have stumbled upon Python zfill(width)
>>>> method, and I thought, really, do you have to include such a narrow-
>>>> purpose method in the basic method set? Perhaps there are more such
>>>> methods that are nice when you need them, but then again, you don't
>>>> put all the possible methods in the standard set.
>>> ? ?I think that you have raised an interesting question here. I've
>>> ? ?been coding in python for 9 years and I have never used it.
>>>
>>>> Perhaps there is reason such method is in the basic library, and my
>>>> complaints are unbased?
>>>
>>> ? ?It could be some sort of legacy. I imagine we will hear from some
>>> ? ?more senior pythonists on this matter.
>>>
>> The documentation says "New in version 2.2.2".
>
> Which is about nine years old, so roughly half as old as Python itself.
> It's hardly a new feature.
>
> Just because Passiday and Tim don't use zfill doesn't mean it's not useful
> to some people. Here are examples of it in use, or people asking how to
> format numbers with leading zeroes:
>
> http://www.ruby-forum.com/topic/67378
> http://stackoverflow.com/questions/134934/display-number-with-leading-zeros
> http://stackoverflow.com/questions/733454/best-way-to-format-integer-as-string-with-leading-zeros
> http://msdn.microsoft.com/en-us/library/dd260048.aspx
> http://www.ozgrid.com/forum/showthread.php?t=64193&page=1
>
> http://www.google.com/codesearch#algXCqBNNP0/utils/zip2rep.py&q=lang:%5Epython$%20zfill%20case:yes&ct=rc&cd=7
>
> http://www.google.com/codesearch#Wnd3W7C0RPM/lives_guide.tar.bz2%7C0MIk12cLwTg/desub.py&q=lang:%5Epython$%20zfill%20case:yes
>
> Padding numbers with leading zeroes is very common. I'm surprised that
> more languages don't make it a string method.
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From anacrolix at gmail.com  Sun Sep 25 00:56:15 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Sun, 25 Sep 2011 14:56:15 +1000
Subject: Why is the shutil module called shutil?
In-Reply-To: <0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
Message-ID: <CAB4yi1MRV1neeZqq-FVA9vX_wUzczD4w6H7eekmV_GUGV_zXzQ@mail.gmail.com>

Please continue

On Sun, Sep 25, 2011 at 8:36 AM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 23, 10:36?pm, Fletcher Johnson <flt.john... at gmail.com> wrote:
>> The topic says it all:
>> Why is shutil named shutil? What does it stand for? This is just a
>> mild curiosity of mine.
>> The shutil module for reference:http://docs.python.org/library/shutil.html#module-shutil
>
> Because even after 20 freaking years of evolution Python "heads of
> state" (or states of head) cannot be bi-partisan enough to agree on a
> freaking File and/or path object; remind you of any "body" we know?
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve+comp.lang.python at pearwood.info  Sun Sep 25 01:21:31 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 15:21:31 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1443.1316902249.27778.python-list@python.org>
Message-ID: <4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>

Terry Reedy wrote:

> On 9/24/2011 9:53 AM, Steven D'Aprano wrote:
[...]
>>>>> [0.0 + i*width for i in range(8)]
>> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
>>
>> The 4th and 7th values have rounding errors, the rest are exact
> 
> No they are not. Their errors are just smaller and not visible with 16
> digits.

Pardon. I meant that they were as close to exact as is possible in binary
floats. With the exception of 0.8999... and 1.7999... I don't believe any
other float can be closer to the exact value.

I did mention that "If the exact value isn't representable as a float, I'm
okay with returning the nearest possible float." :)



-- 
Steven



From steve+comp.lang.python at pearwood.info  Sun Sep 25 01:31:14 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 15:31:14 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1429.1316884776.27778.python-list@python.org>
Message-ID: <4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> On Sun, Sep 25, 2011 at 3:01 AM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> Mark Dickinson wrote:
>>
>>> Using Fraction for intermediate calculations actually works perfectly
>>> for this, since conversions from float to Fraction are exact, while
>>> conversions from Fraction to float are correctly rounded. ?So if
>>> you're using Python, you're not too bothered about efficiency, and you
>>> want provably correctly-rounded results, why not use Fraction?
>>>
>> Ah, I knew it was too easy!
> 
> Try using Fraction for the start and stop too:

If you look again at the code I used, I did. I just did it inside the list
comp. 


>>>> from fractions import Fraction as F
>>>> start,stop,n = F(0),F(21,10),7
>>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
> [0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
> [-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8, 1.1]


Something looks a tad suspicious here... the two list comps are identical,
but give completely different results, even though you don't re-assign
start and stop between calls. You're not editing your results are you?
<wink>

But seriously, you were freaking me out there for a bit. I couldn't see why
pulling the conversion to fraction outside of the list comp was giving
different results. And then it hit me...

>>> 2.1 == F(21, 10)
False

You're testing different numbers from me. Try again with F(2.1) as the stop
value.



-- 
Steven



From ladasky at my-deja.com  Sun Sep 25 01:38:14 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 24 Sep 2011 22:38:14 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <f432139d-8061-434a-a66e-d172d2e7ec12@db5g2000vbb.googlegroups.com>

On Sep 24, 6:53?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> I'm trying to generate a sequence of equally-spaced numbers between a lower
> and upper limit. Given arbitrary limits, what is the best way to generate a
> list of equally spaced floats with the least rounding error for each point?
>
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
>
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>
> and I'd like to return the values in the brackets. Using Decimal or Fraction
> is not an option, I must use floats. If the exact value isn't representable
> as a float, I'm okay with returning the nearest possible float.

Use numpy.

>>> from numpy import mgrid
>>> seq = mgrid[0.0:2.1:8j]
>>> seq

array([ 0. ,  0.3,  0.6,  0.9,  1.2,  1.5,  1.8,  2.1])

>>> for x in seq:
	print repr(x)

0.0
0.29999999999999999
0.59999999999999998
0.89999999999999991
1.2
1.5
1.7999999999999998
2.1000000000000001



From rosuav at gmail.com  Sun Sep 25 02:02:47 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 16:02:47 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1429.1316884776.27778.python-list@python.org>
	<4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmpUiGiTuPX4eWe9TTWvBae7c2QKn1z0QYk8_rrEcHcY7A@mail.gmail.com>

On Sun, Sep 25, 2011 at 3:31 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:>> If you look again at
the code I used, I did. I just did it inside the list> comp.
You did, but you created a Fraction from a float; my version used
Fraction(21,10) instead of (effectively) Fraction(2.1). My description
was a little sloppy, but what I meant was to use Fraction for the
actual arguments to the "function" that this is implementing.
> Something looks a tad suspicious here... the two list comps are identical,
> but give completely different results, even though you don't re-assign
> start and stop between calls. You're not editing your results are you?
> <wink>

Whooops! I had a whole lot of other commands in the scrollback
(displaying intermediate results and such), and elided the rather
crucial reassignment of parameters along with them!

Fortunately, thanks to my reiplophobia, I still have the original
session up in IDLE. This is even the most recent thing in it.

>>> sys.version
'3.2 (r32:88445, Feb 20 2011, 21:29:02) [MSC v.1500 32 bit (Intel)]'
>>> from fractions import Fraction as F
>>> start,stop,n = F(0),F(21,10),7
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>>> start, stop, n = F(-1), F(11,10), 7
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8, 1.1]

There, now it's honest. Sorry about that!!

ChrisA


From tjreedy at udel.edu  Sun Sep 25 02:07:25 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 25 Sep 2011 02:07:25 -0400
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1443.1316902249.27778.python-list@python.org>
	<4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5mget$57s$1@dough.gmane.org>

On 9/25/2011 1:21 AM, Steven D'Aprano wrote:
> Terry Reedy wrote:
>
>> On 9/24/2011 9:53 AM, Steven D'Aprano wrote:
> [...]
>>>>>> [0.0 + i*width for i in range(8)]
>>> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
>>>
>>> The 4th and 7th values have rounding errors, the rest are exact
>>
>> No they are not. Their errors are just smaller and not visible with 16
>> digits.
>
> Pardon. I meant that they were as close to exact as is possible in binary
> floats. With the exception of 0.8999... and 1.7999... I don't believe any
> other float can be closer to the exact value.
>
> I did mention that "If the exact value isn't representable as a float, I'm
> okay with returning the nearest possible float." :)

I do hope you did not stop with my lead-in sentence, and read to the 
end, where I gave you most of the answer you were looking for, without 
using the fractions module.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sun Sep 25 02:09:01 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 16:09:01 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1429.1316884776.27778.python-list@python.org>
	<4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmqEF69Ss0suHtF54Z4PnyWOw6b6SwPOGGcvAGNptMPdiQ@mail.gmail.com>

On Sun, Sep 25, 2011 at 3:31 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
>>>> 2.1 == F(21, 10)
> False
>

Ahh, but that may just mean that Fraction doesn't implement an == that
compares with floats.

>>> 2.1==float(F(21,10))
True

This may be because one oughtn't to use == with floats anyway.

>>> F(2.1)==F(21,10)
False
>>> F(2.1)
Fraction(4728779608739021, 2251799813685248)

That denominator is a power of 2 (2**51 as it happens), which is
unsurprising for something created from an IEEE floating point value.
Rounding F(21,10) off to fit into float produces this same value.

ChrisA


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Subject: TOP 15 HOT BOLLYWOOD KISSES
Message-ID: <31d837d8-5274-4b9a-a1e8-f11cfc7779b1@i9g2000yqe.googlegroups.com>


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From arnodel at gmail.com  Sun Sep 25 03:36:23 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sun, 25 Sep 2011 08:36:23 +0100
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <j5lkgs$e4c$1@dough.gmane.org>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<j5lkgs$e4c$1@dough.gmane.org>
Message-ID: <CAJ6cK1YCoqL+T1mp1RNuzuGO6UGLPN5fp065_UHugZSJ19J4xg@mail.gmail.com>

On 24 September 2011 23:10, Terry Reedy <tjreedy at udel.edu> wrote:

> On 9/24/2011 10:18 AM, Arnaud Delobelle wrote:
>> ? ? ?((n-i)*a + i*b)/n for i in range(n+1)
>
>>>> ['%20.18f' % x for x in [((7-i)*0.0 + i*2.1)/7 for i in range(8)]]
> ['0.000000000000000000', '0.299999999999999989', '0.599999999999999978',
> '0.900000000000000133', '1.199999999999999956', '1.500000000000000000',
> '1.800000000000000266', '2.100000000000000089']
>
> In the two places where this disagrees with the previous result, I believe
> it is worse. The *0.0 adds nothing. You are still multiplying an inexactly
> represented 2.1 by increasingly large numbers. Even 7*2.1/7 is not exact!

Of course *0.0 adds nothing in this case.  I was suggesting a general
solution to the problem of partitioning the interval (a, b) into n
subintervals of equal length.  As for 7*2.1/7 it is exactly the same
as 21/10 to 18 decimal places as the output of your own solution shows
below.

[...]
> The best you can do for this example is
>>>> ['%20.18f' % (i/10 ) for i in range(0, 22, 3)]
> ['0.000000000000000000', '0.299999999999999989', '0.599999999999999978',
> '0.900000000000000022', '1.199999999999999956', '1.500000000000000000',
> '1.800000000000000044', '2.100000000000000089']

Can you give an implementation for any interval (a, b) where a, b are
floats and any partition size n where n is a positive int?

My suggestion was a simple answer which tries to avoid the obvious
pitfalls that the naive approaches may fall into, as shown

>>> def bary(start, stop, n):
...     return [((n-i)*start + i*stop)/n for i in range(n+1)]
...
>>> def width(start, stop, n):
...     width = stop - start
...     return [start + i*width/n for i in range(n+1)]
...

Here is where the 'width' approach will fail:

>>> width(-1.0, 1e-20, 4)
[-1.0, -0.75, -0.5, -0.25, 0.0]
>>> bary(-1.0, 1e-20, 4)
[-1.0, -0.75, -0.5, -0.25, 1e-20]

-- 
Arnaud


From steve+comp.lang.python at pearwood.info  Sun Sep 25 05:30:03 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 19:30:03 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1443.1316902249.27778.python-list@python.org>
	<4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1452.1316930857.27778.python-list@python.org>
Message-ID: <4e7ef49b$0$29987$c3e8da3$5496439d@news.astraweb.com>

Terry Reedy wrote:

> I do hope you did not stop with my lead-in sentence, and read to the
> end, where I gave you most of the answer you were looking for, without
> using the fractions module.

Yes, I read your entire post, thank you, and for my purposes I'm happy with
the fractions module.


-- 
Steven



From t.omahony.dublin at gmail.com  Sun Sep 25 08:31:50 2011
From: t.omahony.dublin at gmail.com (Timmy O'Mahony)
Date: Sun, 25 Sep 2011 05:31:50 -0700 (PDT)
Subject: Inexplicable Urllib2 problem between virtualenv's when POSTing to a
	Tomcat server
Message-ID: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>

Hey, I have a question on Stackoverflow at the moment that I thought I would put up here as it might get some more eyes (It has a bounty so feel free to answer there if you have a SO account!)

----

I have some test code (as a part of a webapp) that uses urllib2 to perform an operation I would usually perform via a browser:

- Log in to a remote website (this works)
- Move to another page (this works)
- Perform a POST by filling in a form (read on ...!)

I've created 4 separate, clean virtualenvs (with --no-site-packages) on 3 different machines, all with different versions of python but the exact same packages (via pip requirements file), and the code only works on the two virtualenvs on my local development machine(2.6.1 and 2.7.2) - it won't work on either of my production VPSs :(

In the failing cases, I can log in successfully, move to the correct page but when I submit the form, the remote server replies telling me that there has been an error - it's an application server error page ('we couldn't complete your request') and not a webserver error. 

- because I can successfully log in and maneuver to a second page, this doesn't seem to be a session or a cookie problem - it's particular to the final POST

- because I can perform the operation on a particular machine with the EXACT same headers and data, this doesn't seem to be a problem with what I am requesting/posting

- because I am trying the code on two separate VPS rented from different companies, this doesn't seem to be a problem with the VPS physical environment

- because the code works on 2 different python versions, I can't imagine it being an incompabilty problem
I'm completely lost at this stage as to why this wouldn't work. I've even 'turned-it-off-and-turn-it-on-again' because I just can't see what the problem could be.

I've tried everything I can think of to get this working. I've been through all of the headers of the requests & responses and they are all the same between machines.

The server I am trying to contact is a Tomcat server. It gives me a cookie called JSESSIONID and it also requires an apache.struct.token in the POST data which I am succesfully extracting with BeautifulSoup/lxml. Again, this works on 2 machines, so I don't think it's an ommision on my behalf, I think it's a compatibility or an encoding error. 

Any ideas welcome!





From eaglebalti at gmail.com  Sun Sep 25 09:47:43 2011
From: eaglebalti at gmail.com (Ashraf Ali)
Date: Sun, 25 Sep 2011 06:47:43 -0700 (PDT)
Subject: Information About Bollywood Famous Actresses Just For You
Message-ID: <353fde50-2433-4cae-84b0-73b36871c95d@q26g2000vby.googlegroups.com>

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From jeanpierreda at gmail.com  Sun Sep 25 11:53:59 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 11:53:59 -0400
Subject: Inexplicable Urllib2 problem between virtualenv's when POSTing to
	a Tomcat server
In-Reply-To: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
References: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
Message-ID: <CABicbJKbivRzi6RyFH7eAz3z_H6N7UvBDw--uCy-FAV5vTLjTA@mail.gmail.com>

It might help to give more information about the machines. In
particular, what versions of Python are on the production machines?

Devin

On Sun, Sep 25, 2011 at 8:31 AM, Timmy O'Mahony
<t.omahony.dublin at gmail.com> wrote:
> Hey, I have a question on Stackoverflow at the moment that I thought I would put up here as it might get some more eyes (It has a bounty so feel free to answer there if you have a SO account!)
>
> ----
>
> I have some test code (as a part of a webapp) that uses urllib2 to perform an operation I would usually perform via a browser:
>
> - Log in to a remote website (this works)
> - Move to another page (this works)
> - Perform a POST by filling in a form (read on ...!)
>
> I've created 4 separate, clean virtualenvs (with --no-site-packages) on 3 different machines, all with different versions of python but the exact same packages (via pip requirements file), and the code only works on the two virtualenvs on my local development machine(2.6.1 and 2.7.2) - it won't work on either of my production VPSs :(
>
> In the failing cases, I can log in successfully, move to the correct page but when I submit the form, the remote server replies telling me that there has been an error - it's an application server error page ('we couldn't complete your request') and not a webserver error.
>
> - because I can successfully log in and maneuver to a second page, this doesn't seem to be a session or a cookie problem - it's particular to the final POST
>
> - because I can perform the operation on a particular machine with the EXACT same headers and data, this doesn't seem to be a problem with what I am requesting/posting
>
> - because I am trying the code on two separate VPS rented from different companies, this doesn't seem to be a problem with the VPS physical environment
>
> - because the code works on 2 different python versions, I can't imagine it being an incompabilty problem
> I'm completely lost at this stage as to why this wouldn't work. I've even 'turned-it-off-and-turn-it-on-again' because I just can't see what the problem could be.
>
> I've tried everything I can think of to get this working. I've been through all of the headers of the requests & responses and they are all the same between machines.
>
> The server I am trying to contact is a Tomcat server. It gives me a cookie called JSESSIONID and it also requires an apache.struct.token in the POST data which I am succesfully extracting with BeautifulSoup/lxml. Again, this works on 2 machines, so I don't think it's an ommision on my behalf, I think it's a compatibility or an encoding error.
>
> Any ideas welcome!
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From t.omahony.dublin at gmail.com  Sun Sep 25 12:48:22 2011
From: t.omahony.dublin at gmail.com (Timmy O'Mahony)
Date: Sun, 25 Sep 2011 09:48:22 -0700 (PDT)
Subject: Inexplicable Urllib2 problem between virtualenv's when POSTing to
	a Tomcat server
In-Reply-To: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
References: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
Message-ID: <21653630.520.1316969302334.JavaMail.geo-discussion-forums@yqjw35>

Good point.

The two machines that the code works with are running python 2.6.1 and 2.7.2 and are running on my Mac (Snow Leopard)

The two non-working machines are running python 2.6.6 and 2.7.1 and are on Debian 6 and Debian 5 respectively. They are VPSs managed by different providers.

All of the installs are on separate virtuaenvs. 


From tim at akwebsoft.com  Sun Sep 25 14:46:14 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sun, 25 Sep 2011 10:46:14 -0800
Subject: Suggested coding style
In-Reply-To: <CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
Message-ID: <20110925184614.GK19422@johnsons-web.com>

* Devin Jeanpierre <jeanpierreda at gmail.com> [110924 19:07]:
> > Padding numbers with leading zeroes is very common. I'm surprised that
> > more languages don't make it a string method.
> 
> By making it a string method, instead of a function, we force all
> implementations of strings to implement that method. That sort of
> sucks, and it's a reason not to include it as a method. 
  Why does it suck? And why do people say 'suck' so much, especially
  in technical venues?
  :) Just answer the first question, the second is rhetorical. I
  think that your answer, regardless of whether I agree with it may
  edify me serendipitously.

> It can, after all, be implemented as a function, and in doing so
> (with the appropriate operator overloading) that function could
> work with multiple implementations of strings. Instead any
> implementation of a string must implement that method. That's a
> waste.
 I'm not sure what you mean. I've written my own `split' function. I
 don't believe that there would be any conflict if you wrote your
 own `zfill' function. Or if there would be, I'd want to know before
 I hurt myself.

 regards
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From petite.abeille at gmail.com  Sun Sep 25 14:54:28 2011
From: petite.abeille at gmail.com (Petite Abeille)
Date: Sun, 25 Sep 2011 20:54:28 +0200
Subject: Suggested coding style
In-Reply-To: <20110925184614.GK19422@johnsons-web.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
Message-ID: <53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>


On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:

>  Why does it suck? And why do people say 'suck' so much, especially in technical venues? :) 

It's a technical term:

http://www.osnews.com/images/comics/wtfm.jpg



From rantingrick at gmail.com  Sun Sep 25 16:30:41 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 25 Sep 2011 13:30:41 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
Message-ID: <683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>

On Sep 24, 11:56?pm, Matt Joiner <anacro... at gmail.com> wrote:
> Please continue

Well specifically we should have a look over the Ruby API's of "File",
"Dir", and "IO". I don't believe we should copy them verbatim --as the
Ruby API is not Pythonic-- however, it may be a good starting point
for something that has been decades overdue within this community.

There was the rejected Path object from PEP 355:
    http://www.python.org/dev/peps/pep-0355/

But it seems the "Anointed One" tossed the idea due to it's
"versatility" and it being a subclass of string... is he joking? o_O

First of all, what the hell is wrong with versatility Mr Van Rossum?
Where else would you put these methods? True it may be a large
collection, however, can YOU offer any suggestions as to where else we
would put them or are YOU just going to latch on to your prejudices of
path objects like your irrational fears of functional programming? Do
you remember the map and lambda fiasco?

We need you to get on board and push something through. When you hide
your head in the sand and imagine everything is "peachy cream" you
expose your backside for a swift kicking.

[References:]

Ruby File Object:
     http://www.ruby-doc.org/core/classes/File.html

Ruby Dir Object:
    http://ruby-doc.org/core/classes/Dir.html

Ruby IO Object:
    http://www.ruby-doc.org/core/classes/IO.html


From rosuav at gmail.com  Sun Sep 25 17:48:29 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 26 Sep 2011 07:48:29 +1000
Subject: Suggested coding style
In-Reply-To: <53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
Message-ID: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 4:54 AM, Petite Abeille
<petite.abeille at gmail.com> wrote:
>
> On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:
>
>> ?Why does it suck? And why do people say 'suck' so much, especially in technical venues? :)
>
> It's a technical term:
>
> http://www.osnews.com/images/comics/wtfm.jpg

Also, because technical people are opinionated windbags. Goes with the
territory. :) Actually, it's partly because it's so easy to create
standards. You don't like X? Create your own language in which it
doesn't exist! You absolutely detest Y? Ignore it and use something
else! But since we can't ignore _everything_ we dislike, there ends up
a happy medium in which we all use the things that we dislike least,
all the while ranting about those aspects of them that "absolutely,
totally suck", and vowing that we could have done way better if we'd
been in the position of Some Famous Guy back when he had that perfect
opportunity to create a new and perfect standard, but he *blew it* by
having a small and narrow view, etc, etc, etc...

Of course, some of us manage to still be courteous and objective when
discussing the things that suck, while others just go off on lengthy
rants. And if you're willing to learn, it's not uncommon to start off
complaining and end up appreciating. :)

Chris Angelico


From jeanpierreda at gmail.com  Sun Sep 25 17:52:35 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 17:52:35 -0400
Subject: Why is the shutil module called shutil?
In-Reply-To: <683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
Message-ID: <CABicbJ+Q0_0qsVXViE2Li4KM82_6a+gUmzeDx+tWdFHEREr-_Q@mail.gmail.com>

> Well specifically we should have a look over the Ruby API's of "File",
> "Dir", and "IO". I don't believe we should copy them verbatim --as the
> Ruby API is not Pythonic-- however, it may be a good starting point
> for something that has been decades overdue within this community.

Perhaps you would be interested in one of the recent threads on Python-Ideas.

http://mail.python.org/pipermail/python-ideas/2011-September/011559.html

Also please stop being abrasive and personally attacking other members
of the Python community.

Devin

On Sun, Sep 25, 2011 at 4:30 PM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 24, 11:56?pm, Matt Joiner <anacro... at gmail.com> wrote:
>> Please continue
>
> Well specifically we should have a look over the Ruby API's of "File",
> "Dir", and "IO". I don't believe we should copy them verbatim --as the
> Ruby API is not Pythonic-- however, it may be a good starting point
> for something that has been decades overdue within this community.
>
> There was the rejected Path object from PEP 355:
> ? ?http://www.python.org/dev/peps/pep-0355/
>
> But it seems the "Anointed One" tossed the idea due to it's
> "versatility" and it being a subclass of string... is he joking? o_O
>
> First of all, what the hell is wrong with versatility Mr Van Rossum?
> Where else would you put these methods? True it may be a large
> collection, however, can YOU offer any suggestions as to where else we
> would put them or are YOU just going to latch on to your prejudices of
> path objects like your irrational fears of functional programming? Do
> you remember the map and lambda fiasco?
>
> We need you to get on board and push something through. When you hide
> your head in the sand and imagine everything is "peachy cream" you
> expose your backside for a swift kicking.
>
> [References:]
>
> Ruby File Object:
> ? ? http://www.ruby-doc.org/core/classes/File.html
>
> Ruby Dir Object:
> ? ?http://ruby-doc.org/core/classes/Dir.html
>
> Ruby IO Object:
> ? ?http://www.ruby-doc.org/core/classes/IO.html
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From arnodel at gmail.com  Sun Sep 25 18:39:47 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sun, 25 Sep 2011 23:39:47 +0100
Subject: Suggested coding style
In-Reply-To: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
Message-ID: <CAJ6cK1bENYJ9LhwXPiDVArn2pbCON4ngA3GvWpTmRd6hd6h=Nw@mail.gmail.com>

On Sep 25, 2011 10:49 PM, "Chris Angelico" <rosuav at gmail.com> wrote:
> And if you're willing to learn, it's not uncommon to start off
> complaining and end up appreciating. :)

+1 QOTW

-- 
Arnaud
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From rantingrick at gmail.com  Sun Sep 25 18:50:17 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 25 Sep 2011 15:50:17 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
Message-ID: <fd4f32a2-57ed-4b34-95d8-1575d0ad2c5e@t11g2000yqk.googlegroups.com>

Here is a *very* rough outline of my ideas. There are probably a few
mistakes in there. I've decided on three main main objects. A File
object, a Path object, and a Dir object.


## START ENLIGHTENMENT ##

class Path:
    def __init__(self, path):
    #
    # Properties about the path:
    drive => str
    directory => str
    filename => str
    extension => str
    uncshare[1]=> ???
    #
    # Mutations.
    def coerce(self) => File or Dir
    def normalize(self): => ip or Path? #normcase/normpath
    def expand_user(self): => ip or Path?
    def expand_vars(self): => ip or Path?
    def absolute(self) => ip or Path? #realpath/abspath
    def strip(self) => ip => remove one extension.
    def chmod(self, mode) => None
    def chown(self, uid, gid) => None [1]
    def rename(self, newname) => None
    def access(self, mode): => None #access
    def chroot(self) => None
    #
    # Introspection.
    def is_valid(self): # exists
    def is_absolute(self): #isabs
    def is_directory(self): #isdir
    def is_file(self): #isfile
    def is_link(self): #islnk
    def is_mount(self): #ismount
    def is_identical(self, other): #issamefile
    def time_accessed(self): #atime
    def time_modified(self): #mtime
    def time_changed(self): #ctime
##    def utime(self, times) => None
    #
    # Inspection.
    def info_stat(self): #stat
    def info_lstat(self): #lstat
    def info_statvfs(self): #statvfs
    #
    # Extraction.
    def basename(self): => str
        #Do we need basename when properties exist?
    def partition(self) => (drive, path, filename, extension)
        #Do we need partition when properties exist?
    def splitunc(self): ???
    def splitall(self): ???
    def relpathto(self, dest): => ???
    def pathconf(self, name): #pathconfig
    #
    # Modifying operations on links
    def link(self, newpath): ...
    def symlink(self, newlink): ...
    def readlink(self): ...
    def readlinkabs(self): ...

class File:
    def new(path)
    (...All existing file methods here...)
    #
    # Mutate, Clone, Destroy.
    def rename(self, newname) => ip or File?
    def delete(self, overwrites=3) => None
    def copy(self, dst) => File
    def unlink(self) => None    #
    #
    # Attribute mutation.
    def update(self) => None #touch
    def copy_mode(src) => None #copymode
    def copy_stat(src) => None #copystat
    def update_mode(dst) => None
    def update_stat(dst) => None
    #
    # Other
    def bytes(self): => int => 1292894
    def size(self, fmtstr="{0:0.2f}") => str => "1.23 MB"
    def backup(self) => filename.bak{count}


class Dir:
    def new(path)
    def open(path)
    #
    # Mutate, Clone, Destroy.
    def delete(self, onerror=None): => None
    def copy(self, dst, symlinks=True): => Dir
    #
    # Introspection.
    def get_paths(self, pattern=None): [Path, Path, ...]
    def get_dirs(self, pattern=None): => [Dir, Dir, ...]
    def get_files(self, pattern=None): => [File, File, ...]
    #
    def walk_paths(self, pattern=None): itereach->PathObj
    def walk_dirs(self, pattern=None): itereach->DirObj
    def walk_files(self, pattern=None): itereach->FileObj
    #
    def match(self, pattern) => bool
    def glob(self, pattern): => [Path, Path, ...]

    #######################################
    # Not sure what to do with these yet.
    #######################################
    def startfile(self)
        # startfile should part of os anyway.

## END ENLIGHTENMENT ##



From rantingrick at gmail.com  Sun Sep 25 19:50:13 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 25 Sep 2011 16:50:13 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
	<fd4f32a2-57ed-4b34-95d8-1575d0ad2c5e@t11g2000yqk.googlegroups.com>
Message-ID: <605ac6e9-0a83-4658-9240-8889980b1862@8g2000yqm.googlegroups.com>

Oh the creative juices are flowing now!!!



class Path:
    def __init__(self, path):
    def __coerce__(self) => File or Dir
    #
    # Properties about the path:
    drive => str
    directory => str
    filename => str
    extension => str
##    uncshare[1]=> ???
    #
    # Mutations.
    def expand_user(self): => ip or Path?
    def expand_vars(self): => ip or Path?
    def to_normpath(self): => ip #normcase/normpath
    def to_abspath(self) => ip #realpath/abspath
    def set_access(self, mode) => None
    def set_owner(self, uid, gid) => None
    def set_root(self, path) => None
    #
    # Introspection.
    def is_accessable(self, mode) => bool #access
    def is_valid(self) => bool # exists
    def is_absolute(self) => bool #isabs
    def is_directory(self) => bool #isdir
    def is_file(self) => bool #isfile
    def is_link(self) => bool #islnk
    def is_mount(self) => bool #ismount
    def is_same(self, path_Dir_or_File) => bool #issamefile
    #
    # Inspection, Extraction
    def get_abspath(self)=> Path
    def get_normpath(self) => Path
##    def get_atime(self) => str #atime
##    def get_mtime(self) => str #mtime
##    def get_ctime(self) => str #ctime
    def get_stat(self) => stat #stat,lstat
##    def get_statvfs(self) => stat #statvfs
##        # do we really need this antiquity?

    ############################################################
    #                         Question                         #
    ############################################################
    # Should all the stat stuff like get_mtime, get_ctime,     #
    # get_atime, etc... be accessed only under get_stat? I     #
    # believe so!                                              #
    ############################################################

    def get_drive(self): => str
    def get_directory(self): => str
    def get_filename(self): => str (empty if is_dir)
    def get_extension(self): => str (empty if is_dir)
    #
    def split(self) => (drive, path, filename, extension)
##    def splitunc(self): ???
##    def splitall(self): ???
##    def relpathto(self, dest): => ???
##    def pathconf(self, name): #pathconfig
    #
    # Modifying operations on links
    def link_new(self, newpath, symbolic=False): ...
    def link_read(self): ...
    def link_readabs(self): ...


class File:
    def new(path)
    (...All existing file methods here...)
    #
    # Mutate, Clone, Destroy.
    def rename(self, newname) => ip or File?
    def delete(self, overwrites=3) => None
    def copy(self, dst) => File
    def unlink(self) => None    #
    #
    # Attribute mutation.
    def update(self) => None #touch
    def copy_mode(src) => None #copymode
    def copy_stat(src) => None #copystat
    def update_mode(dst) => None
    def update_stat(dst) => None
    #
    # Other
    def get_bytes(self): => int => 1292894
    def get_size(self, fmtstr="{0:0.2f}") => str => "1.23 MB"
    def backup(self) => filename.bak{count}


class Dir:
    def new(path)
    def open(path)
    #
    # Mutate, Clone, Destroy.
    def delete(self, onerror=None): => None
    def copy(self, dst, symlinks=True): => Dir
    #
    # Introspection.
    def get_paths(self, pattern=None): [Path, Path, ...]
    def get_dirs(self, pattern=None): => [Dir, Dir, ...]
    def get_files(self, pattern=None): => [File, File, ...]
    def walk_paths(self, pattern=None): itereach->PathObj
    def walk_dirs(self, pattern=None): itereach->DirObj
    def walk_files(self, pattern=None): itereach->FileObj

    ############################################################
    #                         Question                         #
    ############################################################
    # Do we really need "get_*" AND "walk_*"? I believe we     #
    # should choose one set of three                           #
    ############################################################

    def match(self, pattern) => bool
        # Do we need match when re would suffice?
    def glob(self, pattern): => [Path, Path, ...]

    ############################################################
    # Excommunicated Methods.
    ############################################################
    def startfile(self)
        # startfile should part of os anyway.



From jeanpierreda at gmail.com  Sun Sep 25 20:23:47 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 20:23:47 -0400
Subject: Suggested coding style
In-Reply-To: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
Message-ID: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>

>  Why does it suck?

The gist of what I was saying is that it's possible to define
functions that do this "generically" so that one implementation of
zfill can work with multiple implementations of strings. Having to
reimplement every time when one implementation would do is bothersome
and generally isn't done unless it has to be (thus why mmap lacks a
zfill method). Having to do more work than necessary "sucks", as does
having partial str implementations that don't do everything str does.

Ideally, I would claim that if some interface will have multiple
implementations, it should have as few methods as possible to make
implementation as easy as possible, and move as much as possible
_away_ from methods and into functions that work with arbitrary
implementations of the interface. This minimizes the amount of work
that must be done for implementors and thus makes life better.

It's also true that it's "bad practice" to have objects with large
APIs, not for convenience reasons but because it increases object
coupling, something that "good" object oriented design seeks to
eliminate. The idea there is that the less ways you can have your
object interacted with / interact with other objects, the easier it is
to think of the way state flows. I agree with this in principle, but
it doesn't really matter for strings.

The situation I see with something like zfill as-a-method is that it
has nearly negligible benefit (less imports vs function?) and some
detriment. So I would conclude it should not exist. Other people look
at this differently.

> Also, because technical people are opinionated windbags.

Pardon?

Devin

On Sun, Sep 25, 2011 at 5:48 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Mon, Sep 26, 2011 at 4:54 AM, Petite Abeille
> <petite.abeille at gmail.com> wrote:
>>
>> On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:
>>
>>> ?Why does it suck? And why do people say 'suck' so much, especially in technical venues? :)
>>
>> It's a technical term:
>>
>> http://www.osnews.com/images/comics/wtfm.jpg
>
> Also, because technical people are opinionated windbags. Goes with the
> territory. :) Actually, it's partly because it's so easy to create
> standards. You don't like X? Create your own language in which it
> doesn't exist! You absolutely detest Y? Ignore it and use something
> else! But since we can't ignore _everything_ we dislike, there ends up
> a happy medium in which we all use the things that we dislike least,
> all the while ranting about those aspects of them that "absolutely,
> totally suck", and vowing that we could have done way better if we'd
> been in the position of Some Famous Guy back when he had that perfect
> opportunity to create a new and perfect standard, but he *blew it* by
> having a small and narrow view, etc, etc, etc...
>
> Of course, some of us manage to still be courteous and objective when
> discussing the things that suck, while others just go off on lengthy
> rants. And if you're willing to learn, it's not uncommon to start off
> complaining and end up appreciating. :)
>
> Chris Angelico
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From python at mrabarnett.plus.com  Sun Sep 25 20:47:58 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 26 Sep 2011 01:47:58 +0100
Subject: Suggested coding style
In-Reply-To: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
Message-ID: <4E7FCBBE.4070806@mrabarnett.plus.com>

On 26/09/2011 01:23, Devin Jeanpierre wrote:
>>   Why does it suck?
>
> The gist of what I was saying is that it's possible to define
> functions that do this "generically" so that one implementation of
> zfill can work with multiple implementations of strings. Having to
> reimplement every time when one implementation would do is bothersome
> and generally isn't done unless it has to be (thus why mmap lacks a
> zfill method). Having to do more work than necessary "sucks", as does
> having partial str implementations that don't do everything str does.
>
> Ideally, I would claim that if some interface will have multiple
> implementations, it should have as few methods as possible to make
> implementation as easy as possible, and move as much as possible
> _away_ from methods and into functions that work with arbitrary
> implementations of the interface. This minimizes the amount of work
> that must be done for implementors and thus makes life better.
>
[snip]
I would have thought that a better solution would be to specify a
minimal set of methods in an abstract superclass and write the
additional methods using that minimal set.

The concrete string implementations would be descended from the
superclass and would still be able to override the additional methods
with more efficient code were desired, such as in the 'str' class.


From tjreedy at udel.edu  Sun Sep 25 20:58:57 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 25 Sep 2011 20:58:57 -0400
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <CAJ6cK1YCoqL+T1mp1RNuzuGO6UGLPN5fp065_UHugZSJ19J4xg@mail.gmail.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<j5lkgs$e4c$1@dough.gmane.org>
	<CAJ6cK1YCoqL+T1mp1RNuzuGO6UGLPN5fp065_UHugZSJ19J4xg@mail.gmail.com>
Message-ID: <j5oioj$4gh$1@dough.gmane.org>

On 9/25/2011 3:36 AM, Arnaud Delobelle wrote:
> On 24 September 2011 23:10, Terry Reedy<tjreedy at udel.edu>  wrote:

>> The best you can do for this example is
>>>>> ['%20.18f' % (i/10 ) for i in range(0, 22, 3)]
>> ['0.000000000000000000', '0.299999999999999989', '0.599999999999999978',
>> '0.900000000000000022', '1.199999999999999956', '1.500000000000000000',
>> '1.800000000000000044', '2.100000000000000089']
>
> Can you give an implementation for any interval (a, b) where a, b are
> floats and any partition size n where n is a positive int?

I was leaving that as an exercise for Stephen ;-)
but since he is satisfied with using Franctions ...
I accepted the challenge and (I believe) did it.

I first separated float-fractions conversions from generating equally 
spaced fractions. While this does not make much if any difference if and 
when one converts back to floats, testing with (21,10), for instance, as 
input is much easier than with (2.1).as_integer_ratio() ==
(4728779608739021, 2251799813685248). In some applications, small 
integer ratios are wanted anyway instead of floats. The main 
complication in the code is getting all outputs to have the smallest 
possible common denominator across the entire series.

#! python3 -- frange.py
# Copyright 2011 Terry Jan Reedy: use with acknowledgement
'''Generate n+1 equally spaced fractions or float given two endpoints
and the number n of intervals'''

from fractions import gcd

def floatrange(a, b, n):
     '''Yield floats a, b, and n-1 equally spaced floats in between.'''
     for num,dem in fracrange(a.as_integer_ratio(), 
b.as_integer_ratio(), n):
         yield num/dem

def fracrange(frac1, frac2, n):
     '''Yield fractions frac1, frac2 and n-1 equally spaced fractions in 
between.
     Fractions are represented as (numerator, denominator > 0)  pairs.
     For output, use the smallest common denominator of the inputs
     that makes the numerator range an even multiple of n.
     '''
     n1, d1 = frac1
     n2, d2 = frac2
     dem = d1 * d2 // gcd(d1, d2)
     start = n1 * (dem // d1)
     stop = n2 * (dem // d2)
     rang = stop - start
     q, r = divmod(rang, n)
     if r:
         gcd_r_n = gcd(r, n)
         m =  n // gcd_r_n
         dem *= m
         start *= m
         stop *= m
         step  = rang // gcd_r_n  # rang * m // n
     else:
         step = q   # if r==0: gcd(r,n)==n, m==1, rang//n == q
     for num in range(start, stop+1, step):
         yield num,dem

for (i,j), x  in zip(fracrange((0,1), (21,10), 7), floatrange(0.0, 2.1, 7)):
     print((i,j), '%20.18f' % (i/j ), '%20.18f' % x )
print()
for i,j in fracrange((1,10), (22,10), 7): print(i,j)
print()
for i,j in fracrange((1,5), (1,1), 6): print(i,j)

# output
(0, 10) 0.000000000000000000 0.000000000000000000
(3, 10) 0.299999999999999989 0.299999999999999989
(6, 10) 0.599999999999999978 0.599999999999999978
(9, 10) 0.900000000000000022 0.900000000000000022
(12, 10) 1.199999999999999956 1.199999999999999956
(15, 10) 1.500000000000000000 1.500000000000000000
(18, 10) 1.800000000000000044 1.800000000000000044
(21, 10) 2.100000000000000089 2.100000000000000089

1 10
4 10
7 10
10 10
13 10
16 10
19 10
22 10

3 15
5 15
7 15
9 15
11 15
13 15
15 15

-- 
Terry Jan Reedy



From jeanpierreda at gmail.com  Sun Sep 25 21:15:49 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 21:15:49 -0400
Subject: Suggested coding style
In-Reply-To: <4E7FCBBE.4070806@mrabarnett.plus.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
	<4E7FCBBE.4070806@mrabarnett.plus.com>
Message-ID: <CABicbJLUFKvaTRg0UmiryqhXjeEULJqJKmH7yD-sECahUW_42Q@mail.gmail.com>

> I would have thought that a better solution would be to specify a
> minimal set of methods in an abstract superclass and write the
> additional methods using that minimal set.
>
> The concrete string implementations would be descended from the
> superclass and would still be able to override the additional methods
> with more efficient code were desired, such as in the 'str' class.

This does sound better to me too!

Devin

On Sun, Sep 25, 2011 at 8:47 PM, MRAB <python at mrabarnett.plus.com> wrote:
> On 26/09/2011 01:23, Devin Jeanpierre wrote:
>>>
>>> ?Why does it suck?
>>
>> The gist of what I was saying is that it's possible to define
>> functions that do this "generically" so that one implementation of
>> zfill can work with multiple implementations of strings. Having to
>> reimplement every time when one implementation would do is bothersome
>> and generally isn't done unless it has to be (thus why mmap lacks a
>> zfill method). Having to do more work than necessary "sucks", as does
>> having partial str implementations that don't do everything str does.
>>
>> Ideally, I would claim that if some interface will have multiple
>> implementations, it should have as few methods as possible to make
>> implementation as easy as possible, and move as much as possible
>> _away_ from methods and into functions that work with arbitrary
>> implementations of the interface. This minimizes the amount of work
>> that must be done for implementors and thus makes life better.
>>
> [snip]
> I would have thought that a better solution would be to specify a
> minimal set of methods in an abstract superclass and write the
> additional methods using that minimal set.
>
> The concrete string implementations would be descended from the
> superclass and would still be able to override the additional methods
> with more efficient code were desired, such as in the 'str' class.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rosuav at gmail.com  Sun Sep 25 21:42:55 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 26 Sep 2011 11:42:55 +1000
Subject: Suggested coding style
In-Reply-To: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
Message-ID: <CAPTjJmqe4snKL16bcmMm1DxMWGD5nUh+eiOQcAhtVdi5PZVfCg@mail.gmail.com>

On Mon, Sep 26, 2011 at 10:23 AM, Devin Jeanpierre
<jeanpierreda at gmail.com> wrote:
>> Also, because technical people are opinionated windbags.
>
> Pardon?

No offense intended; just look at this list and you'll see how
opinionated people can be, and how willing to express those opinions
in many words! Frank and courteous exchange of views, one of the best
ways to learn about the subject matter... and about the other
programmers too.

ChrisA


From tim at akwebsoft.com  Sun Sep 25 22:55:26 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sun, 25 Sep 2011 18:55:26 -0800
Subject: Suggested coding style
In-Reply-To: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
Message-ID: <20110926025526.GN19422@johnsons-web.com>

* Devin Jeanpierre <jeanpierreda at gmail.com> [110925 16:37]:
> >  Why does it suck?
> 
> The gist of what I was saying is that it's possible to define
> functions that do this "generically" so that one implementation of
> zfill can work with multiple implementations of strings. 

  That is kind of 'spot on' for me. Before I started using python, I
  worked in rebol - where (at that time), there was a limited number
  of function names available because of limited namespacing (and
  the binary was a fraction the size of python). So I learned to
  take that approach.

> Having to
> reimplement every time when one implementation would do is bothersome
> and generally isn't done unless it has to be (thus why mmap lacks a
> zfill method). Having to do more work than necessary "sucks", as does
> having partial str implementations that don't do everything str does.
> 
> Ideally, I would claim that if some interface will have multiple
> implementations, it should have as few methods as possible to make
> implementation as easy as possible, and move as much as possible
> _away_ from methods and into functions that work with arbitrary
> implementations of the interface. This minimizes the amount of work
> that must be done for implementors and thus makes life better.
> 
> It's also true that it's "bad practice" to have objects with large
> APIs, not for convenience reasons but because it increases object
> coupling, something that "good" object oriented design seeks to
> eliminate. The idea there is that the less ways you can have your
> object interacted with / interact with other objects, the easier it is
> to think of the way state flows. I agree with this in principle, but
> it doesn't really matter for strings.
> 
> The situation I see with something like zfill as-a-method is that it
> has nearly negligible benefit (less imports vs function?) and some
> detriment. So I would conclude it should not exist. Other people look
> at this differently.
  Good response.
  Thank you.
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From tim at akwebsoft.com  Sun Sep 25 22:59:20 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sun, 25 Sep 2011 18:59:20 -0800
Subject: Suggested coding style
In-Reply-To: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
Message-ID: <20110926025920.GO19422@johnsons-web.com>

* Chris Angelico <rosuav at gmail.com> [110925 13:50]:
> On Mon, Sep 26, 2011 at 4:54 AM, Petite Abeille
> <petite.abeille at gmail.com> wrote:
> >
> > On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:
> >
> >> ?Why does it suck? And why do people say 'suck' so much, especially in technical venues? :)
> >
> > It's a technical term:
> >
> > http://www.osnews.com/images/comics/wtfm.jpg
> 
> Also, because technical people are opinionated windbags. Goes with the
> territory. :) 
 I always felt that to be courteous, to the point and reserved cost
 me less typing time. And since I'm self-employed and only charge
 for productive time for clients, that's being cost-conscious for me.

 Of course I've been known to get a little crazy about PHP. So don't
 let me get started...

 BTW: If you like ranting as a spectator sport, I have found the
 Common Lisp newsgroup to be among the most spectacular. But that's
 just me.
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From rosuav at gmail.com  Sun Sep 25 23:41:29 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 26 Sep 2011 13:41:29 +1000
Subject: Suggested coding style
In-Reply-To: <20110926025920.GO19422@johnsons-web.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<20110926025920.GO19422@johnsons-web.com>
Message-ID: <CAPTjJmoMdhf5VZ29=XLcGOfPb0rfUKj=Tu--4PMnCAQDCUA+dA@mail.gmail.com>

On Mon, Sep 26, 2011 at 12:59 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> BTW: If you like ranting as a spectator sport, I have found the
> ?Common Lisp newsgroup to be among the most spectacular. But that's
> ?just me.
>

I do, actually, but I don't need to add another newsgroup. Rick
provides plenty of material here, and I can easily sate myself in just
a few other places that I frequent. It's quite amusing to watch those
holy wars erupt...

And every once in a while, they actually prove quite educative. I'm
not sure how it happens, nor how to trigger it - hmm, perhaps this
should be the subject of a scientific paper. "On ranting newsgroups
and how to make them productive".

ChrisA


From wuwei23 at gmail.com  Mon Sep 26 00:18:27 2011
From: wuwei23 at gmail.com (alex23)
Date: Sun, 25 Sep 2011 21:18:27 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
	<fd4f32a2-57ed-4b34-95d8-1575d0ad2c5e@t11g2000yqk.googlegroups.com>
	<605ac6e9-0a83-4658-9240-8889980b1862@8g2000yqm.googlegroups.com>
Message-ID: <098aa3ae-070f-46c5-99e4-f8b712561029@i33g2000yqm.googlegroups.com>

On Sep 26, 9:50?am, rantingrick <rantingr... at gmail.com> wrote:
> Oh the creative juices are flowing now!!!

It's a pity they won't flow into a PyPI project to aggregate interest
in such replacement objects.

But please, spam us some more with your code stubs. It's a nice change
from invective.


From bmacinnis at comcast.net  Mon Sep 26 03:45:11 2011
From: bmacinnis at comcast.net (bmacinnis at comcast.net)
Date: Mon, 26 Sep 2011 03:45:11 -0400
Subject: Counting bits in large string / bit vector
Message-ID: <B10437305E114BA198F2644912B82A35@QUAD>

In Perl I can create a large bit vector as follows:

 

vec($bitmap,10000000,1) = 0;    # this will create a bit string of all zeros

 

To set bits I may using commands like:

 

     vec($bitmap,1000, 1) = 1          # turn on bit 1000

     vec($bitmap,10000, 1) = 1        # turn on bit 10000

     vec($bitmap,1000000, 1) = 1     # turn on bit 10000000

 

which would set three bits in the string $bitmap - Note: in perl I don't
even have to declare $bitmap until I use it in the vec command.

 

Anyway there is a very cool perl command which return the number of bits set
in a large bitmap string instantly. 

The command is:

 

     $setbits = unpack("%32b*", $bitmap);

 

 

Which in this case would store the number 3 in $setbits

 

 

Is there an equivalent command in python that would immediately provide the
number of set bits in a large bit vector/string

 

I know I could loop through but when you have 10,000,000 or 100,000,000
bits, the looping takes quite a while the perl unpack is instant.

 

Thanks for any help you could provide

 

 

 

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From nizamov.shawkat at gmail.com  Mon Sep 26 03:56:56 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Mon, 26 Sep 2011 09:56:56 +0200
Subject: Counting bits in large string / bit vector
In-Reply-To: <B10437305E114BA198F2644912B82A35@QUAD>
References: <B10437305E114BA198F2644912B82A35@QUAD>
Message-ID: <CAFwQ1StJNARy2z21hfOVvmO-JUO69-JAoKEcgLwM608Yt+e8cQ@mail.gmail.com>

> Is there an equivalent command in python that would immediately provide the
> number of set bits in a large bit vector/string
>

You might be able to achieve this using numpy boolean array and, e.g,
the arithmetic sum function or something similar.
There is also another library  http://pypi.python.org/pypi/bitarray
which resembles numpy's bit array.

Hope it helps,
S.Nizamov


From gelonida at gmail.com  Mon Sep 26 04:55:42 2011
From: gelonida at gmail.com (Gelonida N)
Date: Mon, 26 Sep 2011 10:55:42 +0200
Subject: Hierarchical commnd line parsing / help texts
Message-ID: <j5pemf$tnr$1@dough.gmane.org>

Hi,

So far I used optparse.OptionParser for parsing command line arguments
for my python scripts. So far I was happy, with a one level approach,
where I get only one help text

Now I'd like to create a slightly different python script and wondered
which approach / module might be best for implementing the parsing and
generation of help texts.

Please look at my example (let's emulate a shell in python)

$ ./sh.py
or
$ ./sh.py -h
Should create the top level help text and list possible commands
.e.g.
ls
rm
cat
and list some commands with potential sub commands
.e.g.
net
db


then if I typed ./sh.py <command> -h
I'd like to get the helptext for the specified command.

For some more complex commands I'd even like to be able to type


/sh.py <command> <subcommand> -h


Ideally, I would like to be able to parse generic options before
commands / sub commands and less generic options after the commands


./sh.py -v ls -a


Thanks in advance for suggestions





From clp2 at rebertia.com  Mon Sep 26 05:10:17 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 26 Sep 2011 02:10:17 -0700
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <j5pemf$tnr$1@dough.gmane.org>
References: <j5pemf$tnr$1@dough.gmane.org>
Message-ID: <CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 1:55 AM, Gelonida N <gelonida at gmail.com> wrote:
> Hi,
>
> So far I used optparse.OptionParser for parsing command line arguments
> for my python scripts. So far I was happy, with a one level approach,
> where I get only one help text
>
> Now I'd like to create a slightly different python script and wondered
> which approach / module might be best for implementing the parsing and
> generation of help texts.
<snip>
> then if I typed ./sh.py <command> -h
> I'd like to get the helptext for the specified command.

http://docs.python.org/library/argparse.html

It is capable of handling sub-commands and the display of
subcommand-specific help text.

Cheers,
Chris


From __peter__ at web.de  Mon Sep 26 05:11:07 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 26 Sep 2011 11:11:07 +0200
Subject: Counting bits in large string / bit vector
References: <B10437305E114BA198F2644912B82A35@QUAD>
Message-ID: <j5pfiv$44d$1@dough.gmane.org>

bmacinnis at comcast.net wrote:

> In Perl I can create a large bit vector as follows:

> vec($bitmap,10000000,1) = 0;    # this will create a bit string of all
> zeros

> To set bits I may using commands like:

>      vec($bitmap,1000, 1) = 1          # turn on bit 1000
>      vec($bitmap,10000, 1) = 1        # turn on bit 10000
>      vec($bitmap,1000000, 1) = 1     # turn on bit 10000000

> which would set three bits in the string $bitmap - Note: in perl I don't
> even have to declare $bitmap until I use it in the vec command.
> Anyway there is a very cool perl command which return the number of bits
> set in a large bitmap string instantly.
 
> The command is:

>      $setbits = unpack("%32b*", $bitmap);

> Which in this case would store the number 3 in $setbits

> Is there an equivalent command in python that would immediately provide
> the number of set bits in a large bit vector/string
> I know I could loop through but when you have 10,000,000 or 100,000,000
> bits, the looping takes quite a while the perl unpack is instant.

With numpy:

>>> b = numpy.zeros(10**7, dtype=bool)
>>> for x in 3, 4, 6: b[10**x] = True
...
>>> b.sum()
3

I don't know how it's implemented, but it seems to be quite fast.



From gelonida at gmail.com  Mon Sep 26 05:28:59 2011
From: gelonida at gmail.com (Gelonida N)
Date: Mon, 26 Sep 2011 11:28:59 +0200
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
Message-ID: <j5pgkr$b0p$1@dough.gmane.org>

On 09/26/2011 11:10 AM, Chris Rebert wrote:
> On Mon, Sep 26, 2011 at 1:55 AM, Gelonida N <gelonida at gmail.com> wrote:
>> Hi,
>>
>> So far I used optparse.OptionParser for parsing command line arguments
>> for my python scripts. So far I was happy, with a one level approach,
>> where I get only one help text
>>
>> Now I'd like to create a slightly different python script and wondered
>> which approach / module might be best for implementing the parsing and
>> generation of help texts.
> <snip>
>> then if I typed ./sh.py <command> -h
>> I'd like to get the helptext for the specified command.
> 
> http://docs.python.org/library/argparse.html
> 
> It is capable of handling sub-commands and the display of
> subcommand-specific help text.
> 
Thanks a lot.
It seems it's time to start reading about argparse



From arnodel at gmail.com  Mon Sep 26 06:02:02 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Mon, 26 Sep 2011 11:02:02 +0100
Subject: Counting bits in large string / bit vector
In-Reply-To: <j5pfiv$44d$1@dough.gmane.org>
References: <B10437305E114BA198F2644912B82A35@QUAD>
	<j5pfiv$44d$1@dough.gmane.org>
Message-ID: <CAJ6cK1b9wiHYPz8iz8OiYLSkj=N1Rau1BrQ+Hu4Pnvnkj7Vp7w@mail.gmail.com>

>>>> b = numpy.zeros(10**7, dtype=bool)
>>>> for x in 3, 4, 6: b[10**x] = True
> ...
>>>> b.sum()
> 3

Without numpy:

>>> counts = [bin(i).count('1') for i in range(256)]
>>> bytes = b"hello python"*100000
>>> len(bytes)*8
9600000
>>> sum(map(counts.__getitem__, bytes))
4800000

Pretty fast as well.

-- 
Arnaud


From taleinat at gmail.com  Mon Sep 26 07:23:04 2011
From: taleinat at gmail.com (Tal Einat)
Date: Mon, 26 Sep 2011 04:23:04 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
Message-ID: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>

The library is called RunningCalcs and is useful for running several
calculations on a single iterable of values.

https://bitbucket.org/taleinat/runningcalcs/
http://pypi.python.org/pypi/RunningCalcs/

I'd like some input on how this could be made more useful and how to
spread the word about it.


The library contains the base RunningCalc class and implementations of
sub-classes for common calculations: sum, min/max, average, variance &
standard deviation, n-largest & n-smallest. Additionaly a utility
function apply_in_parallel() is supplied which makes running several
calculations on an iterable easy (and fast!).

Straight-forward example:

mean_rc, stddev_rc = RunningMean(), RunningStdDev()
for x in values:
    mean_rc.feed(x)
    stddev_rc.feed(x)
mean, stddev = mean_rc.value, stddev_rc.value

Examples using apply_in_parallel():

mean, stddev = apply_in_parallel(values, [RunningMean(),
RunningStdDev()])
five_smallest, five_largest = apply_in_parallel(values,
[RunningNSmallest(5), RunningNLargest(5)])


Comments and suggestions would be highly appreciated!


From casevh at gmail.com  Mon Sep 26 11:38:57 2011
From: casevh at gmail.com (casevh)
Date: Mon, 26 Sep 2011 08:38:57 -0700 (PDT)
Subject: Counting bits in large string / bit vector
References: <B10437305E114BA198F2644912B82A35@QUAD>
	<mailman.1470.1317023820.27778.python-list@python.org>
Message-ID: <d8dafcc9-b8c9-4772-b008-2087edce1e9f@fx14g2000vbb.googlegroups.com>

On Sep 26, 12:56?am, Nizamov Shawkat <nizamov.shaw... at gmail.com>
wrote:
> > Is there an equivalent command in python that would immediately provide the
> > number of set bits in a large bit vector/string
>
> You might be able to achieve this using numpy boolean array and, e.g,
> the arithmetic sum function or something similar.
> There is also another library ?http://pypi.python.org/pypi/bitarray
> which resembles numpy's bit array.
>
> Hope it helps,
> S.Nizamov

You can also use gmpy or gmpy2.

>>> a=gmpy2.mpz(123)
>>> bin(a)
'0b1111011'
>>> gmpy2.hamdist(a,0)
6
>>>

casevh


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Message-ID: <980d6317-f747-498f-bb22-dd8432bf50be@i33g2000yqm.googlegroups.com>

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From ian.g.kelly at gmail.com  Mon Sep 26 12:39:16 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 26 Sep 2011 10:39:16 -0600
Subject: Counting bits in large string / bit vector
Message-ID: <CALwzid=rH7eJwefvuKGP8FMABos=Nxbgy3EsTxpZZo__18hASA@mail.gmail.com>

On Sep 26, 2011 1:49 AM, <bmacinnis at comcast.net> wrote:
> Is there an equivalent command in python that would immediately provide
the number of set bits in a large bit vector/string

Besides what others have said, if you expect the number of bits set to be
small, you might just use a set.

bits = set()
# set bit 1000
bits.add(1000)
# clear bit 2000000
bits.discard(2000000)
# test bit 1000
if 1000 in bits:
    pass
# get number of bits set
len(bits)

All of these operations are O(1), but if you expect to set a very large
number of bits, then the space trade-off may not be practical.

Cheers,
Ian
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From rahul_g_chaudhary at yahoo.com  Mon Sep 26 13:45:42 2011
From: rahul_g_chaudhary at yahoo.com (Rahul)
Date: Mon, 26 Sep 2011 10:45:42 -0700 (PDT)
Subject: Python Weekly
Message-ID: <13c6df6c-7ab5-4cf6-b82b-9e7631226a8b@i9g2000yqe.googlegroups.com>

Hi Everyone,

I have started a free weekly newsletter called Python Weekly which
includes curated news, articles, new releases, software & tools,
events, jobs etc about Python and related technologies. It's a great
way to keep abreast of what's happening in Python land. You can
subscribe to it here, http://www.pythonweekly.com/

Regards
Rahul Chaudhary


From jesus.ramirez.utexas at gmail.com  Mon Sep 26 14:16:08 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Mon, 26 Sep 2011 11:16:08 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
	<mailman.1448.1316911903.27778.python-list@python.org>
Message-ID: <16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>


I appreciate all the help, but I am still a little confused. Sorry,
I'm a lay person.

Should I download zlib1g-dev and install it to get the zlib module?

and Alter the configure script to avoid future issues?

Also about getting zlib I found the following:

"I was able to recompile zlib

$./configure --shared

then recompile Python 2.5.1; I am now able to import the zlib module.

cheers

-sg"

Does this mean that while in the zlib folder run ./configure shared
and then install python?


From ramit.prasad at jpmorgan.com  Mon Sep 26 14:57:52 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Mon, 26 Sep 2011 14:57:52 -0400
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <j5pgkr$b0p$1@dough.gmane.org>
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
	<j5pgkr$b0p$1@dough.gmane.org>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>

> It seems it's time to start reading about argparse
FYI, it only appears on Python 2.7+

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From benjamin.kaplan at case.edu  Mon Sep 26 15:04:45 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 26 Sep 2011 15:04:45 -0400
Subject: Python 2.5 zlib trouble
In-Reply-To: <16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
	<mailman.1448.1316911903.27778.python-list@python.org>
	<16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>
Message-ID: <CAMuTYXiE6HDP3UATaDd60f9ysgMR1SU-HYDp0Lo2NSvgxe=g+w@mail.gmail.com>

On Mon, Sep 26, 2011 at 2:16 PM, Jesramz <jesus.ramirez.utexas at gmail.com> wrote:
>
> I appreciate all the help, but I am still a little confused. Sorry,
> I'm a lay person.
>
> Should I download zlib1g-dev and install it to get the zlib module?
>
> and Alter the configure script to avoid future issues?
>
> Also about getting zlib I found the following:
>
> "I was able to recompile zlib
>
> $./configure --shared
>
> then recompile Python 2.5.1; I am now able to import the zlib module.
>
> cheers
>
> -sg"
>
> Does this mean that while in the zlib folder run ./configure shared
> and then install python?
> --

Not quite. This person was talking about configuring zlib, not Python.
Just about every Linux program out there has a ./configure file- it's
part of GNU Autotools, which many programs use as an easy way to
compile and install their software. Since the version of zlib on
Ubuntu Natty doesn't work for Python 2.5, this person just compiled
their own zlib (calling ./configure --shared; make; make install from
the zlib *source* folder that they downloaded) and then compiled their
own Python version (from the Python source folder that they
downloaded)


> http://mail.python.org/mailman/listinfo/python-list
>


From paul.nospam at rudin.co.uk  Mon Sep 26 15:44:02 2011
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Mon, 26 Sep 2011 20:44:02 +0100
Subject: Hierarchical commnd line parsing / help texts
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
	<j5pgkr$b0p$1@dough.gmane.org>
	<mailman.1485.1317065300.27778.python-list@python.org>
Message-ID: <874nzz3x8d.fsf@no-fixed-abode.cable.virginmedia.net>

"Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:

> This email is confidential...

Probably a bad idea to post it to a world readable mailing list then :)


From joncle at googlemail.com  Mon Sep 26 16:07:43 2011
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 26 Sep 2011 13:07:43 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
Message-ID: <abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>

On Sep 26, 12:23?pm, Tal Einat <talei... at gmail.com> wrote:
> The library is called RunningCalcs and is useful for running several
> calculations on a single iterable of values.
>
> https://bitbucket.org/taleinat/runningcalcs/http://pypi.python.org/pypi/RunningCalcs/
>
> I'd like some input on how this could be made more useful and how to
> spread the word about it.
>
> The library contains the base RunningCalc class and implementations of
> sub-classes for common calculations: sum, min/max, average, variance &
> standard deviation, n-largest & n-smallest. Additionaly a utility
> function apply_in_parallel() is supplied which makes running several
> calculations on an iterable easy (and fast!).
>
> Straight-forward example:
>
> mean_rc, stddev_rc = RunningMean(), RunningStdDev()
> for x in values:
> ? ? mean_rc.feed(x)
> ? ? stddev_rc.feed(x)
> mean, stddev = mean_rc.value, stddev_rc.value
>
> Examples using apply_in_parallel():
>
> mean, stddev = apply_in_parallel(values, [RunningMean(),
> RunningStdDev()])
> five_smallest, five_largest = apply_in_parallel(values,
> [RunningNSmallest(5), RunningNLargest(5)])
>
> Comments and suggestions would be highly appreciated!

You may not of heard of it, but the SAS language has something called
PROC FREQ... I'm imagining that maybe this is where you should be
taking this. Sorry I can't comment on the code, as I haven't really
got time, but have a look! (I'd be willing to invest sometime with
you, if you agree that's where something like this should be going...)

Cheers,

Jon.


From python.list at tim.thechases.com  Mon Sep 26 16:11:44 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 26 Sep 2011 15:11:44 -0500
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>
References: <j5pemf$tnr$1@dough.gmane.org>	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>	<j5pgkr$b0p$1@dough.gmane.org>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <4E80DC80.8090808@tim.thechases.com>

On 09/26/11 13:57, Prasad, Ramit wrote:
>> It seems it's time to start reading about argparse
> FYI, it only appears on Python 2.7+

However I believe it can be uneventfully copied and run under 
several versions earlier (likely back to 2.5, perhaps to 2.4 -- I 
no longer have 2.4 at my fingertips to test).

-tkc





From ian.g.kelly at gmail.com  Mon Sep 26 16:33:54 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 26 Sep 2011 14:33:54 -0600
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <4E80DC80.8090808@tim.thechases.com>
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
	<j5pgkr$b0p$1@dough.gmane.org>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>
	<4E80DC80.8090808@tim.thechases.com>
Message-ID: <CALwzidmruB4hhi9n8Qwb9pXfxvhiwMvHUsCyxMndtJQ9mhiB-w@mail.gmail.com>

On Mon, Sep 26, 2011 at 2:11 PM, Tim Chase
<python.list at tim.thechases.com> wrote:
> On 09/26/11 13:57, Prasad, Ramit wrote:
>>>
>>> It seems it's time to start reading about argparse
>>
>> FYI, it only appears on Python 2.7+
>
> However I believe it can be uneventfully copied and run under several
> versions earlier (likely back to 2.5, perhaps to 2.4 -- I no longer have 2.4
> at my fingertips to test).

For older versions it would be best to use the Google project, which I
think is still maintained and backported:

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


From jabba.laci at gmail.com  Mon Sep 26 16:39:28 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Mon, 26 Sep 2011 16:39:28 -0400
Subject: install packages with pip to older Python versions
Message-ID: <CAOuJsMk33V0WoX+a2X37jDuzw471FfU+3JVBX=GS2Kk-epcNkg@mail.gmail.com>

Hi,

I have Python 2.7 on my system. Today I wanted to try Google App
Engine but it runs on Python 2.5 at Google so I installed this version
on my machine next to v2.7 to avoid compatibility problems. However,
when I start the Python shell v2.5 and try to import something from
the GAE SDK (for instance "from google.appengine.ext import webapp"),
I get an error: "ImportError: No module named webob". (Note that with
v2.7 I don't have this problem.)

So, how can I install packages for a specific version of Python (here,
v2.5)? With 2.7 I use "sudo pip install <package_name>".

Thanks,

Laszlo


From tgugger at bex.net  Mon Sep 26 16:56:51 2011
From: tgugger at bex.net (TOM)
Date: Mon, 26 Sep 2011 13:56:51 -0700 (PDT)
Subject: QA Engineering/ Python/ Contract/ Austin, TX
Message-ID: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>

Tom Gugger
Independent Recruiter
tgugger at bex.net

US Citizens or Greencard
On Site


QA Engineering/ Python/ Contract/ Austin, TX

This is an immediate start, such as next week. I need three
contractors
for a 4--6 month contract in Austin, TX for Quality Assurance
Engineers.
The location is Austin, TX.

This is an automation project.

Must Have ? Good Network domain knowledge such as TCP/IP.

Must Have --- experience testing  Data, Voice, and IPTV traffic.

Must Have --- Strong Python

A Plus --- Fanfare

Please make sure all the required skills show on the resume. If
interested and
qualified, email resume to tgugger at bex.net.


From clp2 at rebertia.com  Mon Sep 26 17:03:49 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 26 Sep 2011 14:03:49 -0700
Subject: QA Engineering/ Python/ Contract/ Austin, TX
In-Reply-To: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>
References: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>
Message-ID: <CAMZYqRRq6ymmAiJqD+UN10z+aysEmQd1t_FP4MEDj4rE_Bz=JQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 1:56 PM, TOM <tgugger at bex.net> wrote:
> Tom Gugger
> Independent Recruiter
> tgugger at bex.net
>
> US Citizens or Greencard
> On Site
>
>
> QA Engineering/ Python/ Contract/ Austin, TX
>
> This is an immediate start, such as next week. I need three
> contractors

Such postings belong on the Python jobs board
(http://www.python.org/community/jobs/ ), not
python-list/comp.lang.python.

Cheers,
Chris


From atherun at gmail.com  Mon Sep 26 21:07:31 2011
From: atherun at gmail.com (Atherun)
Date: Mon, 26 Sep 2011 18:07:31 -0700 (PDT)
Subject: Race condition deadlock in communicate when threading?
Message-ID: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>

In python 2.6.4 I have a fairly complex system running (copying and
pasting it would be quite difficult).  At its core there are builders
that inherit from threading.Thread.  I have some builders that run
external tasks via popen and read output using communicate.  I have
the ability to run any number of builders in parallel. All of this
uses logging as well, where each builder has their own logger they
create from the base logger i.e. logging.getLogger("Logger.
%s"%self.Name).

When running several threads in parallel that each call popen and
communicate functions, python just hangs, about 95% of the time.  All
of it, parent threads, any threads I started before I got to this
step, it just stops responding.  Stepping through it with pdb trying
to find the deadlock will always make it work, killing the external
app I called via popen, after it has hung, will make it move along as
well. Looking at the stack traces using the code found
http://code.activestate.com/recipes/577334-how-to-debug-deadlocked-multi-threaded-programs/
the threads stop running with the following stacks, this is the last
output from the tracer before it stops responding.:

File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

And

out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()

I'm trying to track this down so I can eliminate it for good as it
pops up in multiple places from time to time.

Any tips would be appreciated.


From wuwei23 at gmail.com  Mon Sep 26 23:11:13 2011
From: wuwei23 at gmail.com (alex23)
Date: Mon, 26 Sep 2011 20:11:13 -0700 (PDT)
Subject: install packages with pip to older Python versions
References: <mailman.1488.1317069590.27778.python-list@python.org>
Message-ID: <ca08c8f0-052a-4ba5-8858-d9da0890f60b@x19g2000vbl.googlegroups.com>

On Sep 27, 6:39?am, Jabba Laci <jabba.l... at gmail.com> wrote:
> So, how can I install packages for a specific version of Python (here,
> v2.5)? With 2.7 I use "sudo pip install <package_name>".

It's amazing what you can find when you look at the documentation:
http://www.pip-installer.org/en/latest/index.html

"You can use pip install --upgrade SomePackage to upgrade to a newer
version, or pip install SomePackage==1.0.4 to install a very specific
version."

However, if you're not using virtualenv, I'd recommend looking at it
as well: http://pypi.python.org/pypi/virtualenv


From devplayer at gmail.com  Tue Sep 27 02:45:21 2011
From: devplayer at gmail.com (DevPlayer)
Date: Mon, 26 Sep 2011 23:45:21 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<20110926025920.GO19422@johnsons-web.com>
	<mailman.1468.1317008498.27778.python-list@python.org>
Message-ID: <492cb266-01df-493c-86d2-1a994933e570@p11g2000yqe.googlegroups.com>

On Sep 25, 11:41?pm, Chris Angelico <ros... at gmail.com> wrote:
> On Mon, Sep 26, 2011 at 12:59 PM, Tim Johnson <t... at akwebsoft.com> wrote:
> > BTW: If you like ranting as a spectator sport, I have found the
> > ?Common Lisp newsgroup to be among the most spectacular. But that's
> > ?just me.
>
> I do, actually, but I don't need to add another newsgroup. Rick
> provides plenty of material here, and I can easily sate myself in just
> a few other places that I frequent. It's quite amusing to watch those
> holy wars erupt...
>
> And every once in a while, they actually prove quite educative. I'm
> not sure how it happens, nor how to trigger it - hmm, perhaps this
> should be the subject of a scientific paper. "On ranting newsgroups
> and how to make them productive".
>
> ChrisA

I think intellectual growth from rants works like this:

Ranter: Bla bla, bad logic, poor facts, some point.
Others: Bla bla you rant Mr Ranter, some logic, few facts, same point.
Ranter: bad mouthing
Others: bad mouthing back
Ranter: Bla Bla, I don't rant, better logic counter facts, lots of
opinion (to not get called a ranter)
Others: Bla bla, You do rant Ranter, good counter logic and facts,
same point (some reason needs to put Ranter "in his place")
Ranter: Super Bla, long winded logic with some strong points, random
but accurate facts out the wazzu (tries to save face)
Others: Acknowleges Ranters point are accurate but claims they don't
apply
Ranter: makes case his points do.
Others: agrees to disagree, silently picks mute Ranter,
Ranter: picks a new topic and starts over.


From devplayer at gmail.com  Tue Sep 27 02:51:08 2011
From: devplayer at gmail.com (DevPlayer)
Date: Mon, 26 Sep 2011 23:51:08 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>

By the way OP Passiday the title of the topic is "Suggested coding
style".

Are you suggesting a coding style or asking for a Python coding style
or are you asking what IS the Python coding style.

If you are asking what is the Python coding style. Google The Zen of
Python. It's pretty much the dictum of coding style and referred to
alot by many Pythoneers.


From pavlovevidence at gmail.com  Tue Sep 27 03:17:50 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 27 Sep 2011 00:17:50 -0700 (PDT)
Subject: Race condition deadlock in communicate when threading?
In-Reply-To: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
Message-ID: <29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>

There's really not enough information for us to debug this, but one possibility is that your subprocess is using buffered I/O; you're expecting the external task to write a string, but it doesn't actually write that string because it's sitting in a buffer.  First thing to try is to see if the program accepts some kind of command line argument to run in unbuffered mode (for instance, if you are calling a Python interpreter you can pass it the -u switch to force unbuffered I/O).  If (like most programs) it doesn't have an option to disable buffering, you can try running it on a pty device (if you're on Unix).  If worse comes to worst, see if there's a way to get the external task to print lots of extra output (a verbosity setting, for instance); that could work in a pinch until you can debug it more thoroughly.


Carl Banks


From r32813 at freescale.com  Tue Sep 27 05:08:54 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Tue, 27 Sep 2011 09:08:54 +0000
Subject: Error 'module' object has no attribute "_extension_registry" when
	cPickle is imported from an installed Python 2.7.1
In-Reply-To: <29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
Message-ID: <02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>

Hello all,

I encounter this issue whereby I am not able to load cPickle module into the python I newly built. There is no issue when I load it right from the folder where the python executable and libpython2.7.so is built. However, it gives me this error when I load the same module using the installed files (python and all its modules, shared library from default /use/local folder that contains bin, lib, include sub-folders) from "make install" command.

Does anyone know why? Here is the error:-

$ python
Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
Type "help", "copyright", "credits" or "license" for more information.
>>> import cPickle
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute '_extension_registry'





From r32813 at freescale.com  Tue Sep 27 05:28:31 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Tue, 27 Sep 2011 09:28:31 +0000
Subject: Error 'No module named _sha256' when importing random in python 2.7.1 
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13> 
Message-ID: <02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>

I just built python 2.7.1 on my HP Itanium 64-bit platform, using aCC. I encountered following issue when importing the random module. Does anyone know why am I getting this error? Thanks in advance for your reply. 

$ python
Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
Type "help", "copyright", "credits" or "license" for more information.
>>> import random
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "random.py", line 49, in <module>
    import hashlib as _hashlib
  File "hashlib.py", line 136, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "hashlib.py", line 74, in __get_builtin_constructor
    import _sha256
ImportError: No module named _sha256
>>> 
 



From clp2 at rebertia.com  Tue Sep 27 05:51:30 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 27 Sep 2011 02:51:30 -0700
Subject: Error 'No module named _sha256' when importing random in python
	2.7.1
In-Reply-To: <02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>
Message-ID: <CAMZYqRSrTQ=Rx75QURHCpfo+FRXNVJhx61Xa8ZMT9nvnxJuGmQ@mail.gmail.com>

On Tue, Sep 27, 2011 at 2:28 AM, Wong Wah Meng-R32813
<r32813 at freescale.com> wrote:
> I just built python 2.7.1 on my HP Itanium 64-bit platform, using aCC. I encountered following issue when importing the random module. Does anyone know why am I getting this error? Thanks in advance for your reply.
<snip>
> ?File "hashlib.py", line 74, in __get_builtin_constructor
> ? ?import _sha256
> ImportError: No module named _sha256

Did you get a message along the lines of "Python build finished, but
the necessary bits to build these modules were not found:" when you
built Python?

Cheers,
Chris


From r32813 at freescale.com  Tue Sep 27 06:04:50 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Tue, 27 Sep 2011 10:04:50 +0000
Subject: Error 'No module named _sha256' when importing random in python
	2.7.1
In-Reply-To: <CAMZYqRSrTQ=Rx75QURHCpfo+FRXNVJhx61Xa8ZMT9nvnxJuGmQ@mail.gmail.com>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>
	<CAMZYqRSrTQ=Rx75QURHCpfo+FRXNVJhx61Xa8ZMT9nvnxJuGmQ@mail.gmail.com>
Message-ID: <02EA6D704E30CE499C5071776509A925F59485@039-SN1MPN1-003.039d.mgd.msft.net>

Yes I did. In fact earlier "make test" failed to execute due to _sha256 not found in one of the module testing. 

Earlier I ignored these failures from the build and make test as I thought they are not needed by my application. Now I can't use "random" module in my application. So I need to solve this issue. 

Here is the output of the build. 

Python build finished, but the necessary bits to build these modules were not found:
_bsddb             _curses            _curses_panel   
_sqlite3           _ssl               bsddb185        
bz2                dl                 gdbm            
imageop            linuxaudiodev      ossaudiodev     
readline           spwd               sunaudiodev     
zlib                                                  
To find the necessary bits, look in setup.py in detect_modules() for the module's name.


Failed to build these modules:
_ctypes            termios                            

Regards,
Wah Meng

-----Original Message-----
From: chris at rebertia.com [mailto:chris at rebertia.com] On Behalf Of Chris Rebert
Sent: Tuesday, September 27, 2011 5:52 PM
To: Wong Wah Meng-R32813
Cc: python-list at python.org
Subject: Re: Error 'No module named _sha256' when importing random in python 2.7.1

On Tue, Sep 27, 2011 at 2:28 AM, Wong Wah Meng-R32813
<r32813 at freescale.com> wrote:
> I just built python 2.7.1 on my HP Itanium 64-bit platform, using aCC. I encountered following issue when importing the random module. Does anyone know why am I getting this error? Thanks in advance for your reply.
<snip>
> ?File "hashlib.py", line 74, in __get_builtin_constructor
> ? ?import _sha256
> ImportError: No module named _sha256

Did you get a message along the lines of "Python build finished, but
the necessary bits to build these modules were not found:" when you
built Python?

Cheers,
Chris




From yixuan178 at gmail.com  Tue Sep 27 06:48:07 2011
From: yixuan178 at gmail.com (yixuan)
Date: Tue, 27 Sep 2011 03:48:07 -0700 (PDT)
Subject: error when use portable python 2.7.2
Message-ID: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>

Hello,
I copy python 2.7.2 folder from other machine to my new installed
Windows XP.
If I run python.exe it would say side by side error, it is caused by
crt environment.
I copy msvc90 runtime and manifest into my folder, python.exe seems
working now.
But when I used 'import FixTk', it would say "dll load failed",
actually, it also a side by side error, if I paste crt libraries into
Dlls folder, it can be solved. But I don't think it is a good
solution.
How can I set it to prevent above error? w/o install any microsoft
package. I want to user can use my package when they unpack it.

Thanks,
Eugene


From alec.taylor6 at gmail.com  Tue Sep 27 07:01:32 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Tue, 27 Sep 2011 21:01:32 +1000
Subject: error when use portable python 2.7.2
In-Reply-To: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
References: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
Message-ID: <CAO+9iGeuF0AvDUoRT5vch9iazU6J5NBTLFXupZYLZipjQRh=Cg@mail.gmail.com>

You're looking for this:
http://www.portablepython.com/wiki/PortablePython2.7.2.1

On Tue, Sep 27, 2011 at 8:48 PM, yixuan <yixuan178 at gmail.com> wrote:
> Hello,
> I copy python 2.7.2 folder from other machine to my new installed
> Windows XP.
> If I run python.exe it would say side by side error, it is caused by
> crt environment.
> I copy msvc90 runtime and manifest into my folder, python.exe seems
> working now.
> But when I used 'import FixTk', it would say "dll load failed",
> actually, it also a side by side error, if I paste crt libraries into
> Dlls folder, it can be solved. But I don't think it is a good
> solution.
> How can I set it to prevent above error? w/o install any microsoft
> package. I want to user can use my package when they unpack it.
>
> Thanks,
> Eugene
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mikehulluk at googlemail.com  Tue Sep 27 07:54:10 2011
From: mikehulluk at googlemail.com (Mike Hull)
Date: Tue, 27 Sep 2011 04:54:10 -0700 (PDT)
Subject: atexit handlers - getting the return code
Message-ID: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>

Hi,
I work in neuroscience modelling and use python for lots of my work.
One problem I have is management of scripts and results. To that end,
I have
written code that make its easier to keep track of scripts, to see
which ones
have run, or need to be rerun, to see output errors and generally
organise running of scripts better.

The way i have implemented it is that I register a function to the
atexit module,
which takes care of recording information about the script run; such
as whether an
exception was raised and not caught, and how long it took to run and
the
stdout/stderr streams; which can then be uploaded into a database.

One thing I am struggling to get though is the 'return code' that the
is going to be returned after my
atexit handlers have finished. Could anyone tell me how it get at
this!?


Thanks


Mike



From yixuan178 at gmail.com  Tue Sep 27 08:00:30 2011
From: yixuan178 at gmail.com (yixuan)
Date: Tue, 27 Sep 2011 05:00:30 -0700 (PDT)
Subject: error when use portable python 2.7.2
References: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
	<mailman.1494.1317121295.27778.python-list@python.org>
Message-ID: <3f4dc714-17c7-4b27-82ff-9f1c50ad5846@g33g2000yqc.googlegroups.com>

On Sep 27, 7:01?pm, Alec Taylor <alec.tayl... at gmail.com> wrote:
> You're looking for this:http://www.portablepython.com/wiki/PortablePython2.7.2.1
>
>
>
>
>
>
>
> On Tue, Sep 27, 2011 at 8:48 PM, yixuan <yixuan... at gmail.com> wrote:
> > Hello,
> > I copy python 2.7.2 folder from other machine to my new installed
> > Windows XP.
> > If I run python.exe it would say side by side error, it is caused by
> > crt environment.
> > I copy msvc90 runtime and manifest into my folder, python.exe seems
> > working now.
> > But when I used 'import FixTk', it would say "dll load failed",
> > actually, it also a side by side error, if I paste crt libraries into
> > Dlls folder, it can be solved. But I don't think it is a good
> > solution.
> > How can I set it to prevent above error? w/o install any microsoft
> > package. I want to user can use my package when they unpack it.
>
> > Thanks,
> > Eugene
> > --
> >http://mail.python.org/mailman/listinfo/python-list

Alec,
Thanks for your information. But in that site, it seems how to rebuild
python for another use.
My issue is that, when I install python 2.7.2 in one windows, then I
want to copy that folder to my new installed windows, and try to run
python. It will ask CRT environment.
Why I need that scenario, i want to package python in my package, so I
want it to run one new installed windows which w/o any crt runtime
installed.

For more convenience, my issue seems like that in DLLs folder, there
has some dlls, python would load them when needed, but when run
application, it couldn't find crt files which stored in python root
folder. So how to set that all dll can find that folder?

Thanks,
Eugene


From drobinow at gmail.com  Tue Sep 27 08:15:10 2011
From: drobinow at gmail.com (David Robinow)
Date: Tue, 27 Sep 2011 08:15:10 -0400
Subject: install packages with pip to older Python versions
In-Reply-To: <CAOuJsMk33V0WoX+a2X37jDuzw471FfU+3JVBX=GS2Kk-epcNkg@mail.gmail.com>
References: <CAOuJsMk33V0WoX+a2X37jDuzw471FfU+3JVBX=GS2Kk-epcNkg@mail.gmail.com>
Message-ID: <CAF3Xjbz+gpOtM32a-HW=gbzLffz1Ycu3cRunCZ_sqVhScYexeQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 4:39 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> I have Python 2.7 on my system. Today I wanted to try Google App
> Engine but it runs on Python 2.5 at Google so I installed this version
> on my machine next to v2.7 to avoid compatibility problems. However,
> when I start the Python shell v2.5 and try to import something from
> the GAE SDK (for instance "from google.appengine.ext import webapp"),
> I get an error: "ImportError: No module named webob". (Note that with
> v2.7 I don't have this problem.)
>
> So, how can I install packages for a specific version of Python (here,
> v2.5)? With 2.7 I use "sudo pip install <package_name>".
sudo pip-2.5 install <package_name>

(You may need to install pip in your 2.5)


From nizamov.shawkat at gmail.com  Tue Sep 27 08:35:38 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Tue, 27 Sep 2011 14:35:38 +0200
Subject: error when use portable python 2.7.2
In-Reply-To: <3f4dc714-17c7-4b27-82ff-9f1c50ad5846@g33g2000yqc.googlegroups.com>
References: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
	<mailman.1494.1317121295.27778.python-list@python.org>
	<3f4dc714-17c7-4b27-82ff-9f1c50ad5846@g33g2000yqc.googlegroups.com>
Message-ID: <CAFwQ1SuYjNJxTFBo69WOZ80EVP6UV1G_FH6afJYKQi+J_FrRFA@mail.gmail.com>

I bet that the difference is in the environment settings (PYTHONPATH).
Look here for details how to set it manually:

http://docs.python.org/using/windows.html


Hope it helps,
S.Nizamov


From g.rodola at gmail.com  Tue Sep 27 08:55:17 2011
From: g.rodola at gmail.com (=?ISO-8859-1?Q?Giampaolo_Rodol=E0?=)
Date: Tue, 27 Sep 2011 14:55:17 +0200
Subject: atexit handlers - getting the return code
In-Reply-To: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
Message-ID: <CAFYqXL8=k=hop-uzcepOhX5fdz95HY-bmMb1Jr_oS7AUCW14zA@mail.gmail.com>

You mean the registered function return value or the process return code?
In the first case you can do something such as:

import atexit

@atexit.register
def cleanup():
     def actual_function():
           ...
           return something
     ret = actual_function()
     # do something with ret

In the latter case you can use sys.exit(code).

--- Giampaolo
http://code.google.com/p/pyftpdlib/
http://code.google.com/p/psutil/

2011/9/27 Mike Hull <mikehulluk at googlemail.com>:
> Hi,
> I work in neuroscience modelling and use python for lots of my work.
> One problem I have is management of scripts and results. To that end,
> I have
> written code that make its easier to keep track of scripts, to see
> which ones
> have run, or need to be rerun, to see output errors and generally
> organise running of scripts better.
>
> The way i have implemented it is that I register a function to the
> atexit module,
> which takes care of recording information about the script run; such
> as whether an
> exception was raised and not caught, and how long it took to run and
> the
> stdout/stderr streams; which can then be uploaded into a database.
>
> One thing I am struggling to get though is the 'return code' that the
> is going to be returned after my
> atexit handlers have finished. Could anyone tell me how it get at
> this!?
>
>
> Thanks
>
>
> Mike
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mikehulluk at googlemail.com  Tue Sep 27 09:37:10 2011
From: mikehulluk at googlemail.com (Mike Hull)
Date: Tue, 27 Sep 2011 06:37:10 -0700 (PDT)
Subject: atexit handlers - getting the return code
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
	<mailman.1497.1317128120.27778.python-list@python.org>
Message-ID: <bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>

Hi Giampaolo,
Sorry, I didn't explain very clearly.
I have a python file, 'simulation_logger.py', (given below).
Then, in my scripts, I add the following lines to the top,



#simulation1.py:
###################
from simulation_logger  import SimulationDecorator
SimulationDecorator.Init()

# Rest of the simulation script....

#####################

and at the end of the simulation, it should write the stdout/stderr,
the return code and any top level exception details into a database.
This is working except I can't work out how to get the return code
the script is going to return.
Any help would be gratefully appreciated,

Thanks!

Mike










# simulation_logger.py
########################

import atexit
import sys
import os
import cStringIO
import time
import traceback
import datetime
import inspect

class SimulationRunInfo(object):
 def __init__(self, script_name ):
    self.return_code = None
    self.time_taken = None
    self.time_out = None
    self.std_out = None
    self.std_err = None
    self.exception_details = None,None

    self.script_name = script_name



class IOStreamDistributor(object):
    def __init__(self, outputs):
        self.outputs = outputs

    def write(self,  *args, **kwargs):
        for op in self.outputs:
            op.write(*args, **kwargs)




class SimulationDecorator(object):

    start_time = None
    time_out = None
    is_initialised = False
    exception_details = None,None

    std_out = None
    std_err = None
    script_name = None





    @classmethod
    def exit_handler(cls, *args, **kwargs):
        print 'Exit Handler'
        print 'Args', args
        print 'KwArgs', kwargs

        info = SimulationRunInfo( cls.script_name)

        # Read and restore the StdOut/Err
        info.std_out = cls.std_out.getvalue()
        sys.stdout = sys.__stdout__
        info.std_err = cls.std_err.getvalue()
        sys.stderr = sys.__stderr__

        # Get the return value:
        info.return_code = 0

        # Get the timing:
        info.time_taken = int( time.time() - cls.start_time )

        # Has thier been an exception?
        info.exception_details = cls.exception_details
        if info.exception_details != (None,None):
          print 'Exception details', info.exception_details
          info.return_code = -1

        # Write to SimulationDataBase

        # Save the information to a database:
        SimulationDBWriter.write_to_database(info)


    @classmethod
    def top_level_exception_handler(cls, exception_type, exception,
traceback, *args):
        print 'TopLevel Exception Handler'
        cls.exception_details  = exception_type, exception, traceback

    @classmethod
    def Init(cls, time_out=None):
        assert not cls.is_initialised

        if 'MF_TIMEOUT' in os.environ:
            timeout = int( os.environ['MF_TIMEOUT'] )


        # Filename of the Simulation script
        cwd = os.getcwd()
        cls.script_name = os.path.join( cwd, traceback.extract_stack()
[0][0] )
        #cls.script_name = traceback.extract_stack()[0][2].
        #cls.script_name = inspect.stack()[-1][1]

        #Intercept StdOut and StdErr:
        cls.std_out = cStringIO.StringIO()
        sys.stdout = IOStreamDistributor( [cls.std_out, sys.stdout] )
        cls.std_err = cStringIO.StringIO()
        sys.stderr = IOStreamDistributor( [cls.std_err, sys.stderr] )

        # Set an exit handler and a top level exception-handler
        # Set a top level exception handler:
        atexit.register( cls.exit_handler )
        sys.excepthook = cls.top_level_exception_handler


        # Set a time-out alarm
        cls.start_time = time.time()
        cls.time_out = time_out



From wescpy at gmail.com  Tue Sep 27 10:00:55 2011
From: wescpy at gmail.com (wesley chun)
Date: Tue, 27 Sep 2011 11:00:55 -0300
Subject: ANN: Intro+Intermediate Python course, SF, Oct 18-20
In-Reply-To: <CAB6eaA5LA5V5F11m1vbCcxW=1x2anhN101jcF6tGYZboxscN_Q@mail.gmail.com>
References: <CAB6eaA5LA5V5F11m1vbCcxW=1x2anhN101jcF6tGYZboxscN_Q@mail.gmail.com>
Message-ID: <CAB6eaA7zdU1siY-2RodTNr4eE_McAEew=2DoGCqwFCa2a-15OQ@mail.gmail.com>

** FINAL CALL **

http://sfbay.craigslist.org/sfc/cls/2495963854.html


---------- Forwarded message ----------
From: wesley chun <wescpy at gmail.com>
Date: Mon, Jul 25, 2011 at 12:32 PM
Subject: ANN: Intro+Intermediate Python course, SF, Oct 18-20

Need to get up-to-speed with Python as quickly and as in-depth as
possible? Already coding Python but still have areas of uncertainty
you need to fill? Then come join me, Wesley Chun, author of
Prentice-Hall's bestseller "Core Python" for a comprehensive
intro/intermediate course coming up this May in Northern California,
then enjoy a beautiful Fall weekend afterwards in San Francisco, the
beautiful city by the bay.

Please pass on this note to whomever you think may be interested. I
look forward to meeting you and your colleagues! Feel free to pass
around the PDF flyer linked down below. Write if you have questions.

Since I hate spam, I'll only send out one reminder as the date gets
closer.

(Comprehensive) Intro+Intermediate Python
Tue-Thu, 2011 Oct 18-20, 9am-5pm

Hope to meet you soon!
-Wesley

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Although this course may appear to those new to Python, it is also
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We will immerse you in the world of Python in only a few days, showing
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NASA, Ubuntu, YouTube, and Red Hat all use Python. Users supporting or
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PREVIEW 1: you will find (and can download) a video clip of a
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the interactive classroom environment (as well as sign-up) at:

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PREVIEW 2: Partnering with O'Reilly and Pearson, Safari Books
Online has asked me to deliver a 1-hour webcast a couple of years ago
called "What is Python?". This was an online seminar based on a
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will give you an idea of lecture style as well as an overview of the
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covered in the course.

info:http://www.safaribooksonline.com/events/WhatIsPython.html
download (reg req'd):
http://www.safaribooksonline.com/Corporate/DownloadAndResources/webcastInfo.php?page=WhatIsPython
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"Python Fundamentals", Prentice Hall, (c)2009
    http://corepython.com

wesley.chun : wescpy-gmail.com : @wescpy
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com
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From taleinat at gmail.com  Tue Sep 27 10:24:12 2011
From: taleinat at gmail.com (Tal Einat)
Date: Tue, 27 Sep 2011 07:24:12 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
In-Reply-To: <abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
Message-ID: <13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>

I don't work with SAS so I have no reason to invest any time developing for it.

Also, as far as I can tell, SAS is far from free or open-source, meaning I definitely am not interested in developing for it.

My library solves a problem for which there is no existing solution in the world of Python programming, AFAIK. I'm certainly not surprised such solutions already exist in other computing environments, but that's not relevant for me.


From robert.kern at gmail.com  Tue Sep 27 11:49:47 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 27 Sep 2011 11:49:47 -0400
Subject: Wrote a new library - Comments and suggestions please!
In-Reply-To: <13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
Message-ID: <j5srar$dfl$1@dough.gmane.org>

On 9/27/11 10:24 AM, Tal Einat wrote:
> I don't work with SAS so I have no reason to invest any time developing for it.
>
> Also, as far as I can tell, SAS is far from free or open-source, meaning I definitely am not interested in developing for it.

I don't think he's suggesting that you drop what you are doing in Python and 
start working with SAS. He is suggesting that you look at the similar procedures 
that exist in the SAS standard library for inspiration.

-- 
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  Tue Sep 27 11:52:13 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 27 Sep 2011 11:52:13 -0400
Subject: QA Engineering/ Python/ Contract/ Austin, TX
In-Reply-To: <CAMZYqRRq6ymmAiJqD+UN10z+aysEmQd1t_FP4MEDj4rE_Bz=JQ@mail.gmail.com>
References: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>
	<CAMZYqRRq6ymmAiJqD+UN10z+aysEmQd1t_FP4MEDj4rE_Bz=JQ@mail.gmail.com>
Message-ID: <j5srfd$d8c$1@dough.gmane.org>

On 9/26/11 5:03 PM, Chris Rebert wrote:
> On Mon, Sep 26, 2011 at 1:56 PM, TOM<tgugger at bex.net>  wrote:
>> Tom Gugger
>> Independent Recruiter
>> tgugger at bex.net
>>
>> US Citizens or Greencard
>> On Site
>>
>>
>> QA Engineering/ Python/ Contract/ Austin, TX
>>
>> This is an immediate start, such as next week. I need three
>> contractors
>
> Such postings belong on the Python jobs board
> (http://www.python.org/community/jobs/ ), not
> python-list/comp.lang.python.

While he should definitely also post to the Jobs Board, job postings have 
usually been welcomed on python-list provided that they are relevant and not too 
spammy. Using [JOB] in the Subject line also helps.

-- 
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  Tue Sep 27 11:59:09 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 27 Sep 2011 11:59:09 -0400
Subject: atexit handlers - getting the return code
In-Reply-To: <bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
	<mailman.1497.1317128120.27778.python-list@python.org>
	<bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>
Message-ID: <j5srsd$he8$1@dough.gmane.org>

On 9/27/11 9:37 AM, Mike Hull wrote:
> Hi Giampaolo,
> Sorry, I didn't explain very clearly.
> I have a python file, 'simulation_logger.py', (given below).
> Then, in my scripts, I add the following lines to the top,
>
>
>
> #simulation1.py:
> ###################
> from simulation_logger  import SimulationDecorator
> SimulationDecorator.Init()
>
> # Rest of the simulation script....
>
> #####################
>
> and at the end of the simulation, it should write the stdout/stderr,
> the return code and any top level exception details into a database.
> This is working except I can't work out how to get the return code
> the script is going to return.

I don't think that's available inside the process. You may want to use a 
"runner" script that records this information. Additionally, the runner script 
could record the stdout/stderr information more cleanly than stubbing out 
sys.stdout/sys.stderr. For example, if you have C or Fortran modules that use 
their own mechanisms to print things directly to the STDOUT/STDERR file 
descriptors, your sys.stdout/sys.stderr stubs will never be informed about it. 
However, if the runner script directs stdout/stderr to a pipe, it can read every 
bit of text that gets printed. Timing is probably also best recorded by the 
runner script to record the startup overhead of the Python interpreter. Continue 
to use the SimulationDecorator to record the traceback information, though.

-- 
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 sakthi92 at gmail.com  Tue Sep 27 13:21:24 2011
From: sakthi92 at gmail.com (sakthi)
Date: Tue, 27 Sep 2011 10:21:24 -0700 (PDT)
Subject: Multiplication error in python
Message-ID: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>

In the following code,
>>> l=[1,2,3,4,5]
>>> i=0
>>> for a in l:
...     p=2*a
...     t=p+i
...     i=t
...
>>> t
45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.


From steve+comp.lang.python at pearwood.info  Tue Sep 27 13:33:13 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 28 Sep 2011 03:33:13 +1000
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
Message-ID: <4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>

Robert Kern wrote:

> On 9/27/11 10:24 AM, Tal Einat wrote:
>> I don't work with SAS so I have no reason to invest any time developing
>> for it.
>>
>> Also, as far as I can tell, SAS is far from free or open-source, meaning
>> I definitely am not interested in developing for it.
> 
> I don't think he's suggesting that you drop what you are doing in Python
> and start working with SAS. He is suggesting that you look at the similar
> procedures that exist in the SAS standard library for inspiration.

Yeah, inspiration on what *not* to do.

I googled on "SAS PROC FREQ" and found this:

http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/default/procstat_freq_sect006.htm

All the words are in English, but I have no idea what the function does, how
you would call it, and what it returns. Would it have been so hard to show
a couple of examples?

Documentation like that really makes me appreciate the sterling work done on
Python's docs.

This tutorial:

http://www2.sas.com/proceedings/sugi30/263-30.pdf

is much clearer.



-- 
Steven



From gherron at digipen.edu  Tue Sep 27 13:41:02 2011
From: gherron at digipen.edu (Gary Herron)
Date: Tue, 27 Sep 2011 10:41:02 -0700
Subject: Multiplication error in python
In-Reply-To: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <4E820AAE.2000405@digipen.edu>

On 09/27/2011 10:21 AM, sakthi wrote:
> In the following code,
>>>> l=[1,2,3,4,5]
>>>> i=0
>>>> for a in l:
> ...     p=2*a
> ...     t=p+i
> ...     i=t
> ...
>>>> t
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.

I think it's most likely you've made an error here.  Running your exact 
lines in Python gives the expected result:
 >>> l=[1,2,3,4,5]
 >>> i=0
 >>> for a in l:
   ...   p=2*a
   ...   t=p+i
   ...   i=t
   ...
 >>> t
   30

Please try again.  If you can reproduce the incorrect result -- then we 
have a real bug.  However, the chance of that is really really tiny.

Gary Herron






-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From pruebauno at latinmail.com  Tue Sep 27 13:42:02 2011
From: pruebauno at latinmail.com (nn)
Date: Tue, 27 Sep 2011 10:42:02 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <4082eb5c-9374-4409-a007-1133eb13bb36@i28g2000yqn.googlegroups.com>

On Sep 27, 1:21?pm, sakthi <sakth... at gmail.com> wrote:
> In the following code,>>> l=[1,2,3,4,5]
> >>> i=0
> >>> for a in l:
>
> ... ? ? p=2*a
> ... ? ? t=p+i
> ... ? ? i=t
> ...>>> t
>
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.

You must be doing something different than these steps:

Python 3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> l=[1,2,3,4,5]
>>> i=0
>>> for a in l:
	p=2*a
	t=p+i
	i=t


>>> t
30
>>>


From contato at abruno.com  Tue Sep 27 13:42:20 2011
From: contato at abruno.com (Alysson Bruno (WebSite))
Date: Tue, 27 Sep 2011 14:42:20 -0300
Subject: Multiplication error in python
In-Reply-To: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <CADUW+MkP8UONvJ79NK5vpTN6EiCLiq0+G8P6Deocn_+ag55dWA@mail.gmail.com>

In my python 3.2, no problem:

>>> l=[1,2,3,4,5]
>>> i=0
>>> for a in l:
...   p=2*a
...   t=p+i
...   i=t
...   print("p={}, t={}, i={}".format(p,t,i))
...
p=2, t=2, i=2
p=4, t=6, i=6
p=6, t=12, i=12
p=8, t=20, i=20
p=10, t=30, i=30
>>> t
30
>>>

paz e amor (love and peace),

Alysson Bruno
Palmas(TO)
Brasil

http://abruno.com

Leia: Heo Sargila: Hist?ria da Cria??o:
http://heosargila.blogspot.com/2011/09/historia-da-criacao.html



2011/9/27 sakthi <sakthi92 at gmail.com>

> In the following code,
> >>> l=[1,2,3,4,5]
> >>> i=0
> >>> for a in l:
> ...     p=2*a
> ...     t=p+i
> ...     i=t
> ...
> >>> t
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From bex.lewis at gmail.com  Tue Sep 27 13:43:00 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 27 Sep 2011 10:43:00 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <4dfd3a08-d5df-48a2-91d1-95a2a0f79c3e@j19g2000yqc.googlegroups.com>

I tried running your code in ipython:

In [1]: l = [1,2,3,4,5]
In [2]: i = 0
In [3]: for a in l:
   ...:     p = 2 * a
   ...:     t = p + i
   ...:     i = t
   ...:
In [4]:
In [4]: t
Out[4]: 30

The output from Python was 30, not 45. What Python version are you
running?

On Sep 27, 6:21?pm, sakthi <sakth... at gmail.com> wrote:

> In the following code,>>> l=[1,2,3,4,5]
> >>> i=0
> >>> for a in l:
>
> ... ? ? p=2*a
> ... ? ? t=p+i
> ... ? ? i=t
> ...>>> t
>
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.



From clp2 at rebertia.com  Tue Sep 27 13:43:22 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 27 Sep 2011 10:43:22 -0700
Subject: Multiplication error in python
In-Reply-To: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <CAMZYqRQCtXsyvVsxiBVXROQHQzaiBjLR4JbTJQabKMzq1H-U=w@mail.gmail.com>

On Tue, Sep 27, 2011 at 10:21 AM, sakthi <sakthi92 at gmail.com> wrote:
> In the following code,
>>>> l=[1,2,3,4,5]
>>>> i=0
>>>> for a in l:
> ... ? ? p=2*a
> ... ? ? t=p+i
> ... ? ? i=t
> ...
>>>> t
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.

My Python gives 30; methinks perhaps you've elided some important part
of your code.
Also, I note that your loop body can be significantly simplified to
just: i += 2*a

Cheers,
Chris
--
http://rebertia.com


From sakthi92 at gmail.com  Tue Sep 27 13:50:23 2011
From: sakthi92 at gmail.com (sakthi)
Date: Tue, 27 Sep 2011 10:50:23 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<mailman.1504.1317145412.27778.python-list@python.org>
Message-ID: <2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>

On Sep 27, 1:43?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Sep 27, 2011 at 10:21 AM, sakthi <sakth... at gmail.com> wrote:
> > In the following code,
> >>>> l=[1,2,3,4,5]
> >>>> i=0
> >>>> for a in l:
> > ... ? ? p=2*a
> > ... ? ? t=p+i
> > ... ? ? i=t
> > ...
> >>>> t
> > 45
>
> > Python gives an answer as 45. But i am getting 30 when i execute
> > manually. Is there any different multiplication pattern in python?
> > Thank yu.
>
> My Python gives 30; methinks perhaps you've elided some important part
> of your code.
> Also, I note that your loop body can be significantly simplified to
> just: i += 2*a
>
> Cheers,
> Chris
> --http://rebertia.com

if i put i += 2*a it returns 155.


From bex.lewis at gmail.com  Tue Sep 27 14:51:06 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 27 Sep 2011 11:51:06 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<mailman.1504.1317145412.27778.python-list@python.org>
	<2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>
Message-ID: <b904f32a-4354-43d2-893b-1fc1b3c5c17a@p11g2000yqe.googlegroups.com>

I think you may be doing something wrong.

If I run:
>>> l = [1, 2, 3, 4, 5]
>>> i = 0
>>> for a in l:
    ...    i += 2 * a
    ...
>>> i
 30

The result is 30 as expected.

Nowhere near the 155 that you are getting. :/

Again, could you state which version of python are you using (and what
OS) so that we can run the code in the same environment as you.

Becky Lewis


>
> > > Python gives an answer as 45. But i am getting 30 when i execute
> > > manually. Is there any different multiplication pattern in python?
> > > Thank yu.
>
> > My Python gives 30; methinks perhaps you've elided some important part
> > of your code.
> > Also, I note that your loop body can be significantly simplified to
> > just: i += 2*a
>
> > Cheers,
> > Chris
> > --http://rebertia.com
>
> if i put i += 2*a it returns 155.



From mikehulluk at googlemail.com  Tue Sep 27 15:12:09 2011
From: mikehulluk at googlemail.com (Mike Hull)
Date: Tue, 27 Sep 2011 12:12:09 -0700 (PDT)
Subject: atexit handlers - getting the return code
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
	<mailman.1497.1317128120.27778.python-list@python.org>
	<bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>
	<mailman.1503.1317139208.27778.python-list@python.org>
Message-ID: <662ee8e4-34af-42aa-b01b-edace3af133d@20g2000yqq.googlegroups.com>

On Sep 27, 4:59?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 9/27/11 9:37 AM, Mike Hull wrote:
>
>
>
>
>
>
>
>
>
> > Hi Giampaolo,
> > Sorry, I didn't explain very clearly.
> > I have a python file, 'simulation_logger.py', (given below).
> > Then, in my scripts, I add the following lines to the top,
>
> > #simulation1.py:
> > ###################
> > from simulation_logger ?import SimulationDecorator
> > SimulationDecorator.Init()
>
> > # Rest of the simulation script....
>
> > #####################
>
> > and at the end of the simulation, it should write the stdout/stderr,
> > the return code and any top level exception details into a database.
> > This is working except I can't work out how to get the return code
> > the script is going to return.
>
> I don't think that's available inside the process. You may want to use a
> "runner" script that records this information. Additionally, the runner script
> could record the stdout/stderr information more cleanly than stubbing out
> sys.stdout/sys.stderr. For example, if you have C or Fortran modules that use
> their own mechanisms to print things directly to the STDOUT/STDERR file
> descriptors, your sys.stdout/sys.stderr stubs will never be informed about it.
> However, if the runner script directs stdout/stderr to a pipe, it can read every
> bit of text that gets printed. Timing is probably also best recorded by the
> runner script to record the startup overhead of the Python interpreter. Continue
> to use the SimulationDecorator to record the traceback information, though.
>
> --
> 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

Hi Robert,
Thanks for this. The return code is not super important at this stage,
but I thought I would
try and get everything working neatly. Creating a separate runner
script is probably the way
to go. If i get some time I will implement it like that. My reason for
wanting to do it 'in
the same script' was that I also have another library that intercepts
calls to matplotlib's show(),
so I could ultimately create a pdf containing the script with figures
interjected at the right place.
Anyway, I will have to think about that some more.

Thanks again!

Mike



From mwilson at the-wire.com  Tue Sep 27 15:12:20 2011
From: mwilson at the-wire.com (Mel)
Date: Tue, 27 Sep 2011 15:12:20 -0400
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5t76i$k2e$1@speranza.aioe.org>

Steven D'Aprano wrote:
> I googled on "SAS PROC FREQ" and found this:
> 
http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/default/procstat_freq_sect006.htm
> 
> All the words are in English, but I have no idea what the function does,
> how you would call it, and what it returns. Would it have been so hard to
> show a couple of examples?

Hmm.  Yeah.  Very much so.  That's the kind of documentation I call "syntax 
happy".  It tells you how to create a well-formed PROC STAT without ever 
saying what would happen if you did, or why you might want that, whatever it 
was, to happen.  I see that kind of documentation way too often.  By 
comparison, even this <https://www.ubersoft.net/comic/hd/2011/09/losing-
sight-big-picture> might seem good.  At least they try.

"Does things to the stuff.  By default, the most recent stuff is done things 
to."

	Mel.



From tundra at tundraware.com  Tue Sep 27 15:12:33 2011
From: tundra at tundraware.com (Tim Daneliuk)
Date: Tue, 27 Sep 2011 14:12:33 -0500
Subject: Multiplication error in python
In-Reply-To: <2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<mailman.1504.1317145412.27778.python-list@python.org>
	<2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>
Message-ID: <1qj9l8-t6b.ln1@ozzie.tundraware.com>

On 9/27/2011 12:50 PM, sakthi said this:
> On Sep 27, 1:43 pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Tue, Sep 27, 2011 at 10:21 AM, sakthi <sakth... at gmail.com> wrote:
>>> In the following code,
>>>>>> l=[1,2,3,4,5]
>>>>>> i=0
>>>>>> for a in l:
>>> ...     p=2*a
>>> ...     t=p+i
>>> ...     i=t
>>> ...
>>>>>> t
>>> 45
>>
>>> Python gives an answer as 45. But i am getting 30 when i execute
>>> manually. Is there any different multiplication pattern in python?
>>> Thank yu.
>>
>> My Python gives 30; methinks perhaps you've elided some important part
>> of your code.
>> Also, I note that your loop body can be significantly simplified to
>> just: i += 2*a
>>
>> Cheers,
>> Chris
>> --http://rebertia.com
> 
> if i put i += 2*a it returns 155.

Are you sure you don't have something indented incorrectly?

How about a plain text copy of your program (without the interactive
stuff) so we can run it independently...


-- 
------------------------------------------------------------------------
Tim Daneliuk
tundra at tundraware.com


From joncle at googlemail.com  Tue Sep 27 15:54:22 2011
From: joncle at googlemail.com (Jon Clements)
Date: Tue, 27 Sep 2011 12:54:22 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <65466670-d990-4d7c-9cca-0ac3ec9881a6@db5g2000vbb.googlegroups.com>

On Sep 27, 6:33?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Robert Kern wrote:
> > On 9/27/11 10:24 AM, Tal Einat wrote:
> >> I don't work with SAS so I have no reason to invest any time developing
> >> for it.
>
> >> Also, as far as I can tell, SAS is far from free or open-source, meaning
> >> I definitely am not interested in developing for it.
>
> > I don't think he's suggesting that you drop what you are doing in Python
> > and start working with SAS. He is suggesting that you look at the similar
> > procedures that exist in the SAS standard library for inspiration.
>
> Yeah, inspiration on what *not* to do.
>
> I googled on "SAS PROC FREQ" and found this:
>
> http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/defau...
>
> All the words are in English, but I have no idea what the function does, how
> you would call it, and what it returns. Would it have been so hard to show
> a couple of examples?
>
> Documentation like that really makes me appreciate the sterling work done on
> Python's docs.
>
> This tutorial:
>
> http://www2.sas.com/proceedings/sugi30/263-30.pdf
>
> is much clearer.
>
> --
> Steven

Yes - I definitely do not like the SAS docs - in fact, when I last had
to "buy" the product, it was something like ?5k for the "BASE" system,
then if I wanted ODBC it was another ?900, and the "proper" manuals
were something stupid like another ?1k (and only in hard copy) - this
was a good 5/6 years ago though... (oh, and for a very basic course,
it was ?1.2k a day for staff to train) *sighs* [oh, and if I wanted a
'site' licence, we were talking 6 digits]

Anyway, Robert Kern correctly interpreted me. I was not suggesting to
the OP that he move to SAS (heaven forbid), I was indeed suggesting
that he look into what similar systems have (that I have experience
with and appreciate), and he acknowledges that is not present in
Python, and ummm, take inspiration and quite possibly "rip 'em off".

A decent tabulate/cross-tabulation and statistics related there-to
library is something I'd be willing to assist with and put time into.

Cheers,

Jon.





From rantingrick at gmail.com  Tue Sep 27 16:45:52 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 27 Sep 2011 13:45:52 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
Message-ID: <8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>

On Sep 27, 1:51?am, DevPlayer <devpla... at gmail.com> wrote:
> By the way OP Passiday the title of the topic is "Suggested coding
> style".
>
> Are you suggesting a coding style or asking for a Python coding style
> or are you asking what IS the Python coding style.
>
> If you are asking what is the Python coding style. Google The Zen of
> Python. It's pretty much the dictum of coding style and referred to
> alot by many Pythoneers.

The Python zen is a very general outline of our collective religious
beliefs concerning programming (and it could be applied to many
fields). Every Python programmer should know the zen by heart. Which
can be very beneficial in a war of words when some smart mouth decides
to quote the zen in an attempt to defeat you. Since, like the bible
the zen is self contradicting, any argument utilizing the zen can be
defeated utilizing the zen.

If however you want to learn about the accepted rules for formatting
code then you need to read "PEP-8"! PEP 8 is our style guide. It is
not perfect as i have pointed out on many occasions HOWEVER it is the
only thing we have that keeps multiplicity from reproducing like
leporidae.

  http://www.python.org/dev/peps/pep-0008/


From wanderer at dialup4less.com  Tue Sep 27 16:54:48 2011
From: wanderer at dialup4less.com (Wanderer)
Date: Tue, 27 Sep 2011 13:54:48 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
Message-ID: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>

How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says

"Python 2.6.6 has been replaced by a newer security-fix only source
release of Python. Please download Python 2.6.7 instead."

But there is no windows installer on the 2.6.7 page. Do I install
2.6.6 first and then update to 2.6.7?

Thanks


From arnodel at gmail.com  Tue Sep 27 17:11:58 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 27 Sep 2011 22:11:58 +0100
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
Message-ID: <CAJ6cK1Z-5fZmOjoZsRPMhu_-gzPh7pMwMYcE+2J++o17Xuw9Pw@mail.gmail.com>

On 27 September 2011 21:54, Wanderer <wanderer at dialup4less.com> wrote:
> How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> "Python 2.6.6 has been replaced by a newer security-fix only source
> release of Python. Please download Python 2.6.7 instead."
>
> But there is no windows installer on the 2.6.7 page. Do I install
> 2.6.6 first and then update to 2.6.7?

I don't know if it would suite your needs but there's ActivePython -
they provide an installer for 2.6.7

http://www.activestate.com/activepython/downloads

HTH

-- 
Arnaud


From brian.curtin at gmail.com  Tue Sep 27 17:17:45 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Tue, 27 Sep 2011 16:17:45 -0500
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
Message-ID: <CAD+XWwqy=4-bk5nA6BLLg8Ei0kEc39CdE0o1F1BPSRa0rf57tg@mail.gmail.com>

On Tue, Sep 27, 2011 at 15:54, Wanderer <wanderer at dialup4less.com> wrote:
> How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> "Python 2.6.6 has been replaced by a newer security-fix only source
> release of Python. Please download Python 2.6.7 instead."
>
> But there is no windows installer on the 2.6.7 page. Do I install
> 2.6.6 first and then update to 2.6.7?

As the text states, 2.6.7 is only a source code release. 2.6.6 is the
last binary package available, but if you need what's in 2.6.7, you
will have to compile the source yourself.

Alternatively, you could upgrade to 2.7 as 2.6 will continue to only
receive security fixes, or as Arnaud states, you could use an
alternative distribution to get 2.6.6.


From bex.lewis at gmail.com  Tue Sep 27 17:19:33 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 27 Sep 2011 14:19:33 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
Message-ID: <42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>

On Sep 27, 9:54?pm, Wanderer <wande... at dialup4less.com> wrote:
> How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> "Python 2.6.6 has been replaced by a newer security-fix only source
> release of Python. Please download Python 2.6.7 instead."
>
> But there is no windows installer on the 2.6.7 page. Do I install
> 2.6.6 first and then update to 2.6.7?
>
> Thanks

Hi,

is there any reason that you specifically need the 2.6 branch or would
it be possible to update to 2.7?

As someone else already pointed out, there's the ActivePython route if
you really need 2.6.7.


From wanderer at dialup4less.com  Tue Sep 27 17:32:43 2011
From: wanderer at dialup4less.com (Wanderer)
Date: Tue, 27 Sep 2011 14:32:43 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
Message-ID: <1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>

On Sep 27, 5:19?pm, becky_lewis <bex.le... at gmail.com> wrote:
> On Sep 27, 9:54?pm, Wanderer <wande... at dialup4less.com> wrote:
>
> > How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> > "Python 2.6.6 has been replaced by a newer security-fix only source
> > release of Python. Please download Python 2.6.7 instead."
>
> > But there is no windows installer on the 2.6.7 page. Do I install
> > 2.6.6 first and then update to 2.6.7?
>
> > Thanks
>
> Hi,
>
> is there any reason that you specifically need the 2.6 branch or would
> it be possible to update to 2.7?
>
> As someone else already pointed out, there's the ActivePython route if
> you really need 2.6.7.

I need to stay in sink with the rest of the company which is still
using 2.6 flavors. There was some investigation into going to Python 3
but not enough of the libraries we use were available. I'll install
2.6.6. I don't think the security stuff really effects me. I think it
is strange to release a security update but not really expect people
to use it.


From iamforufriends at gmail.com  Tue Sep 27 18:02:21 2011
From: iamforufriends at gmail.com (hot girl)
Date: Tue, 27 Sep 2011 15:02:21 -0700 (PDT)
Subject: hai date with girl for free
Message-ID: <1239dc58-6fcd-4f7d-8795-1907e08af831@j10g2000vbb.googlegroups.com>

want a gf for dating

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas


From aljosa.mohorovic at gmail.com  Tue Sep 27 18:54:37 2011
From: aljosa.mohorovic at gmail.com (Aljosa Mohorovic)
Date: Tue, 27 Sep 2011 15:54:37 -0700 (PDT)
Subject: oauth2 server implementation
Message-ID: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>

i'm looking for oauth2 server implementation but other than
https://github.com/simplegeo/python-oauth2 (oauth v1 implementation)
it doesn't seem that people are using v2 implementations.
anybody using some oauth2 implementation and can share some info?


Aljosa Mohorovic


From brian.curtin at gmail.com  Tue Sep 27 18:59:35 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Tue, 27 Sep 2011 17:59:35 -0500
Subject: PyCon 2012 Proposals Due October 12
Message-ID: <CAD+XWwqJapzt-9L=Tyb5K4vdh8AzJSyru3u4nKSXCEdOJAjDAA@mail.gmail.com>

The deadline for PyCon 2012 tutorial, talk, and poster proposals is
under 15 days away, so be sure to get your submissions in by October
12, 2011. Whether you?re a first-timer or an experienced veteran,
PyCon is depends on you, the community, coming together to build the
best conference schedule possible. Our
call for proposals (http://us.pycon.org/2012/cfp/) lays out the
details it takes to be included in the lineup for the conference in
Santa Clara, CA on March 7-15, 2012.

If you?re unsure of what to write about, our recent survey yielded a
large list of potential talk topics
(http://pycon.blogspot.com/2011/09/need-talk-ideas.html), and plenty
of ideas for tutorials (INSERT TUTORIAL POST). We?ve also come up with
general tips on proposal writing at
http://pycon.blogspot.com/2011/08/writing-good-proposal.html to ensure
everyone has the most complete proposal when it comes time for review.
As always, the program committee wants to put together an incredible
conference, so they?ll be working with submitters to fine tune
proposal details and help you produce the best submissions.

We?ve had plenty of great news to share since we first announced the
call for proposals. Paul Graham of Y Combinator was recently announced
as a keynote speaker
(http://pycon.blogspot.com/2011/09/announcing-first-pycon-2012-keynote.html),
making his return after a 2003 keynote. David Beazley, famous for his
mind-blowing talks on CPython?s Global Interpreter Lock, was added to
the plenary talk series
(http://pycon.blogspot.com/2011/09/announcing-first-pycon-2012-plenary.html).
Sponsors can now list their job openings on the ?Job Fair? section of
the PyCon site (http://pycon.blogspot.com/2011/09/announcing-pycon-2012-fair-page-sponsor.html).
We?re hard at work to bring you the best conference yet, so stay tuned
to PyCon news at http://pycon.blogspot.com/ and on Twitter at
https://twitter.com/#!/pycon.

We recently eclipsed last year?s sponsorship count of 40 and are
currently at a record 52 organizations supporting PyCon. If you or
your organization are interested in sponsoring PyCon, we?d love to
hear from you, so check out our sponsorship page
(http://us.pycon.org/2012/sponsors/).

A quick thanks to all of our awesome PyCon 2012 Sponsors:

- Diamond Level: Google and Dropbox.
- Platinum Level: New Relic, SurveyMonkey, Microsoft, Eventbrite,
Nasuni and Gondor.io
- Gold Level: Walt Disney Animation Studios, CCP Games, Linode,
Enthought, Canonical, Dotcloud, Loggly, Revsys, ZeOmega, Bitly,
ActiveState, JetBrains, Caktus, Disqus, Spotify, Snoball, Evite, and
PlaidCloud
- Silver Level: Imaginary Landscape, WiserTogether, Net-ng, Olark, AG
Interactive, Bitbucket, Open Bastion, 10Gen, gocept, Lex Machina,
fwix, github, toast driven, Aarki, Threadless, Cox Media, myYearBook,
Accense Technology, Wingware, FreshBooks, and BigDoor
- Lanyard: Dreamhost
- Sprints: Reddit
- FLOSS: OSU/OSL, OpenHatch


The PyCon Organizers - http://us.pycon.org/2012
Jesse Noller - Chairman - jnoller at python.org
Brian Curtin - Publicity Coordinator - brian at python.org


From gagsl-py2 at yahoo.com.ar  Tue Sep 27 19:52:55 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 27 Sep 2011 20:52:55 -0300
Subject: Error 'module' object has no attribute "_extension_registry" when
	cPickle is imported from an installed Python 2.7.1
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
Message-ID: <op.v2hrahhax6zn5v@lepton>

En Tue, 27 Sep 2011 06:08:54 -0300, Wong Wah Meng-R32813  
<r32813 at freescale.com> escribi?:

> Hello all,
>
> I encounter this issue whereby I am not able to load cPickle module into  
> the python I newly built. There is no issue when I load it right from  
> the folder where the python executable and libpython2.7.so is built.  
> However, it gives me this error when I load the same module using the  
> installed files (python and all its modules, shared library from default  
> /use/local folder that contains bin, lib, include sub-folders) from  
> "make install" command.
>
> Does anyone know why? Here is the error:-
>
> $ python
> Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import cPickle
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AttributeError: 'module' object has no attribute '_extension_registry'

Looking at cPickle.c, it imports the copy_reg module and then looks for  
its "_extension_registry" attribute. Maybe your copy_reg.py is broken, or  
you have another copy_reg.py hiding the standard one.

-- 
Gabriel Genellina



From roy at panix.com  Tue Sep 27 20:17:01 2011
From: roy at panix.com (Roy Smith)
Date: Tue, 27 Sep 2011 20:17:01 -0400
Subject: oauth2 server implementation
References: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>
Message-ID: <roy-E5FDBE.20170027092011@news.panix.com>

In article 
<4c93ff75-1d85-48ec-b6d1-b71f216c61ce at g33g2000yqc.googlegroups.com>,
 Aljosa Mohorovic <aljosa.mohorovic at gmail.com> wrote:

> i'm looking for oauth2 server implementation but other than
> https://github.com/simplegeo/python-oauth2 (oauth v1 implementation)
> it doesn't seem that people are using v2 implementations.
> anybody using some oauth2 implementation and can share some info?
> 
> 
> Aljosa Mohorovic

We rolled our own oauth2 client on top of basic urllib calls.  It's not 
terribly difficult.

Other than Twitter, I'm not aware of anybody still using oauth1.


From brian.curtin at gmail.com  Tue Sep 27 20:52:07 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Tue, 27 Sep 2011 19:52:07 -0500
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
Message-ID: <CAD+XWwoSsLug6iUajPPsR+GJ2uatNNXOsTDnpCTqOX+X33v82Q@mail.gmail.com>

On Tue, Sep 27, 2011 at 16:32, Wanderer <wanderer at dialup4less.com> wrote:

> I think it is strange to release a security update but not really expect
> people
> to use it.


We expect that people who need 2.6 but won't move to 2.7, and at the same
time are vulnerable to the security issue(s), would be able to compile
Python for themselves. Shortly after 2.7 was released, 2.6 went into
security-fix mode, and that's true of any X.Y and X.Y-1 pair.

For a look at how busy the release schedule has been at times, I wrote about
all of the releases we were up to in June at
http://blog.python.org/2011/06/june-releases-267-272-314.html. Consider the
fact that the person creating the installer usually creates at least three
installers for any release (usually two candidates, and the final - add in
alphas for a new X.Y), for each branch, of which three branches were having
binary installers produced.

For the specifics on the 2.6.7 fix,
http://blog.python.org/2011/04/urllib-security-vulnerability-fixed.html covers
it.
-------------- next part --------------
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From tjreedy at udel.edu  Tue Sep 27 20:56:49 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 27 Sep 2011 20:56:49 -0400
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
Message-ID: <j5trcm$65h$1@dough.gmane.org>

On 9/27/2011 5:32 PM, Wanderer wrote:

> I need to stay in sink with the rest of the company which is still
> using 2.6 flavors. There was some investigation into going to Python 3
> but not enough of the libraries we use were available. I'll install
> 2.6.6. I don't think the security stuff really effects me. I think it
> is strange to release a security update but not really expect people
> to use it.

It is used most, I presume, by security-conscious server people, 
especially *nix people, who expect to compile their own binary. The 
ordinary user is hardly affected by most of these issues.

-- 
Terry Jan Reedy



From wuwei23 at gmail.com  Tue Sep 27 22:22:49 2011
From: wuwei23 at gmail.com (alex23)
Date: Tue, 27 Sep 2011 19:22:49 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <553f821c-58c1-4b81-817e-078c148af209@j19g2000yqc.googlegroups.com>

Steven D'Aprano <steve+comp.lang.pyt... at pearwood.info> wrote:
> I googled on "SAS PROC FREQ" and found this:
>
> http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/defau...
>
> All the words are in English, but I have no idea what the function does, how
> you would call it, and what it returns. Would it have been so hard to show
> a couple of examples?

I'm currently arms deep in converting a handful of randomisation
algorithms written in SAS into Python. Pretty much ALL of the magic
happens behind cryptic SAS calls like this. I'm having more success
reverse-engineering the _results_ they produce and building something
Pythonic and comprehensible.



From wuwei23 at gmail.com  Tue Sep 27 22:25:48 2011
From: wuwei23 at gmail.com (alex23)
Date: Tue, 27 Sep 2011 19:25:48 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
Message-ID: <d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>

rantingrick <rantingr... at gmail.com> wrote:
> Since, like the bible
> the zen is self contradicting, any argument utilizing the zen can be
> defeated utilizing the zen.

And like the Bible, the Zen was created by humans as a joke. If you're
taking it too seriously, that's your problem.

> If however you want to learn about the accepted rules for formatting
> code then you need to read "PEP-8"! PEP 8 is our style guide.

PEP 8 is the _standard library style guide_. There's a difference.

> It is
> not perfect as i have pointed out on many occasions HOWEVER it is the
> only thing we have that keeps multiplicity from reproducing like
> leporidae.

Yes, save us from multiplicity, variety and difference. Nothing good
comes from them anyway.



From steve+comp.lang.python at pearwood.info  Wed Sep 28 00:25:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 28 Sep 2011 04:25:05 GMT
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
Message-ID: <4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>

On Tue, 27 Sep 2011 14:32:43 -0700, Wanderer wrote:

> I need to stay in sink with the rest of the company which is still using
> 2.6 flavors. There was some investigation into going to Python 3 but not
> enough of the libraries we use were available. I'll install 2.6.6. I
> don't think the security stuff really effects me. I think it is strange
> to release a security update but not really expect people to use it.


More likely the person who builds the Windows installers just hasn't made 
a new release yet.

The Python development team is relatively small and chronically busy: too 
much to do and not enough time to do it. As I understand it, most of them 
use Linux, so I'm afraid that Windows sometimes takes a back seat. (At 
least it's not Mac OS, which is stuck riding in the boot of the car, or 
the other semi-supported OSes, which are on a skateboard desperately 
hanging onto the bumper trying not to be left behind.)

You could try installing from source, if you have the appropriate Windows 
development environment.



-- 
Steven


From timr at probo.com  Wed Sep 28 02:28:32 2011
From: timr at probo.com (Tim Roberts)
Date: Tue, 27 Sep 2011 23:28:32 -0700
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <cjf5875ftnqppihvpogguuippelco58nin@4ax.com>

sakthi <sakthi92 at gmail.com> wrote:

>In the following code,
>>>> l=[1,2,3,4,5]
>>>> i=0
>>>> for a in l:
>...     p=2*a
>...     t=p+i
>...     i=t
>...
>>>> t
>45
>
>Python gives an answer as 45. But i am getting 30 when i execute
>manually. Is there any different multiplication pattern in python?

My guess is that you actually typed
    p=3*a
instead of
    p=2*a

That produces 45.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From r32813 at freescale.com  Wed Sep 28 02:37:56 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Wed, 28 Sep 2011 06:37:56 +0000
Subject: Error 'module' object has no attribute "_extension_registry"
	when	cPickle is imported from an installed Python 2.7.1
In-Reply-To: <op.v2hrahhax6zn5v@lepton>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
	<op.v2hrahhax6zn5v@lepton>
Message-ID: <02EA6D704E30CE499C5071776509A925F598F9@039-SN1MPN1-003.039d.mgd.msft.net>

Thanks Gabriel,

Indeed, there is corrupted copy_reg.py file residing in my $PYTHONPATH folder, as opposed to the standard one from the installed package. Thanks a lot for your helps!

Regards,
Wah Meng

-----Original Message-----
From: python-list-bounces+wahmeng=freescale.com at python.org [mailto:python-list-bounces+wahmeng=freescale.com at python.org] On Behalf Of Gabriel Genellina
Sent: Wednesday, September 28, 2011 7:53 AM
To: python-list at python.org
Subject: Re: Error 'module' object has no attribute "_extension_registry" when cPickle is imported from an installed Python 2.7.1

En Tue, 27 Sep 2011 06:08:54 -0300, Wong Wah Meng-R32813  
<r32813 at freescale.com> escribi?:

> Hello all,
>
> I encounter this issue whereby I am not able to load cPickle module into  
> the python I newly built. There is no issue when I load it right from  
> the folder where the python executable and libpython2.7.so is built.  
> However, it gives me this error when I load the same module using the  
> installed files (python and all its modules, shared library from default  
> /use/local folder that contains bin, lib, include sub-folders) from  
> "make install" command.
>
> Does anyone know why? Here is the error:-
>
> $ python
> Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import cPickle
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AttributeError: 'module' object has no attribute '_extension_registry'

Looking at cPickle.c, it imports the copy_reg module and then looks for  
its "_extension_registry" attribute. Maybe your copy_reg.py is broken, or  
you have another copy_reg.py hiding the standard one.

-- 
Gabriel Genellina

-- 
http://mail.python.org/mailman/listinfo/python-list




From 1248283536 at qq.com  Wed Sep 28 03:24:13 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Wed, 28 Sep 2011 15:24:13 +0800
Subject: how to run in xp?
Message-ID: <tencent_668C2ABD4239059823E912BC@qq.com>

#coding:utf-8
import urllib
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'w')
    url='http://www.nasdaq.com/screening/companies- \  by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.urlopen(url).read()
    myfile.write(file)
    print ('ok',down)
    myfile.close()

it can run in ubuntu+python2.6 ,when it run in window xp+python32,the output is  
Traceback (most recent call last):
  File "C:\Python32\getcode.py", line 8, in <module>
    file=urllib.urlopen(url).read()
AttributeError: 'module' object has no attribute 'urlopen'

i change it into:
#coding:utf-8
import urllib.request
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'w')
    url='http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print ('ok',down)
    myfile.close()

the output is :
Traceback (most recent call last):
  File "C:\Python32\getcode.py", line 9, in <module>
    myfile.write(file)
TypeError: must be str, not bytes

how to make it run in xp+python32?
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From rosuav at gmail.com  Wed Sep 28 03:31:16 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 17:31:16 +1000
Subject: Multiplication error in python
In-Reply-To: <cjf5875ftnqppihvpogguuippelco58nin@4ax.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<cjf5875ftnqppihvpogguuippelco58nin@4ax.com>
Message-ID: <CAPTjJmo4sALojxu_p=Var3S5NMoEAs0h+SUWwNfj7MvOXtqmoA@mail.gmail.com>

On Wed, Sep 28, 2011 at 4:28 PM, Tim Roberts <timr at probo.com> wrote:
> My guess is that you actually typed
> ? ?p=3*a
> instead of
> ? ?p=2*a
>
> That produces 45.
>

Or alternatively, that you used an interactive Python environment and
didn't clear i between runs.

ChrisA


From __peter__ at web.de  Wed Sep 28 04:04:46 2011
From: __peter__ at web.de (Peter Otten)
Date: Wed, 28 Sep 2011 10:04:46 +0200
Subject: how to run in xp?
References: <tencent_668C2ABD4239059823E912BC@qq.com>
Message-ID: <j5uke7$ou8$1@dough.gmane.org>

=?gbk?B?ytjW6rT9zcM=?= wrote:

> #coding:utf-8
> import urllib
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies- \ 
>     by-industry.aspx?exchange='+down+'&render=download'
>     file=urllib.urlopen(url).read() myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> it can run in ubuntu+python2.6 ,when it run in window xp+python32,the
> output is Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 8, in <module>
>     file=urllib.urlopen(url).read()
> AttributeError: 'module' object has no attribute 'urlopen'
> 
> i change it into:
> #coding:utf-8
> import urllib.request
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> the output is :
> Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 9, in <module>
>     myfile.write(file)
> TypeError: must be str, not bytes
> 
> how to make it run in xp+python32?

The problem here is the switch from Python 2 to 3. Python 3 has some 
backwards-incompatible Syntax changes along with changes to classes and 
library organisation. The good news is that there's a tool, 2to3, that can 
handle most of these changes:

$ cat getcode.py
#coding:utf-8   
import urllib   
exchange=['NASDAQ','NYSE','AMEX'] 
for down in exchange:             
    myfile=open('./'+down,'wb')   
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download' 
    file=urllib.urlopen(url).read()                                                                    
    myfile.write(file)                                                                                 
    print 'ok', down
    myfile.close()
$ cp getcode.py getcode3.py
$ 2to3-3.2 getcode3.py -w
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
RefactoringTool: Refactored getcode3.py
--- getcode3.py (original)
+++ getcode3.py (refactored)
@@ -1,10 +1,10 @@
 #coding:utf-8
-import urllib
+import urllib.request, urllib.parse, urllib.error
 exchange=['NASDAQ','NYSE','AMEX']
 for down in exchange:
     myfile=open('./'+down,'wb')
     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
-    file=urllib.urlopen(url).read()
+    file=urllib.request.urlopen(url).read()
     myfile.write(file)
-    print 'ok', down
+    print('ok', down)
     myfile.close()
RefactoringTool: Files that were modified:
RefactoringTool: getcode3.py
$ cat getcode3.py
#coding:utf-8
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'wb')
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print('ok', down)
    myfile.close()
$ python3.2 getcode3.py
ok NASDAQ
ok NYSE
ok AMEX




From r32813 at freescale.com  Wed Sep 28 04:37:13 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Wed, 28 Sep 2011 08:37:13 +0000
Subject: python 2.7.1 built not supporting thread? 
In-Reply-To: <op.v2hrahhax6zn5v@lepton>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
	<op.v2hrahhax6zn5v@lepton>
Message-ID: <02EA6D704E30CE499C5071776509A925F59952@039-SN1MPN1-003.039d.mgd.msft.net>


Hello there,

I couldn't detect this problem until I run my application that utilizes thread module in python that I just built on HP-UX 11.31 ia64 using aCC.

Could it be the build did not include enable thread option? _REENTRANT as stated in the README file? If yes, it looks like threading may not work "out of the box". 


>>> thread.start_new_thread(testing, ())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
thread.error: can't start new thread
>>>

Excerpts from README file for python 2.7 build

HP-UX:  When using threading, you may have to add -D_REENTRANT to the
        OPT variable in the top-level Makefile; reported by Pat Knight,
        this seems to make a difference (at least for HP-UX 10.20)
        even though pyconfig.h defines it. This seems unnecessary when
        using HP/UX 11 and later - threading seems to work "out of the
        box".

 



From xahlee at gmail.com  Wed Sep 28 05:28:38 2011
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 28 Sep 2011 02:28:38 -0700 (PDT)
Subject: question about speed of sequential string replacement vs regex or
Message-ID: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>

curious question.

suppose you have 300 different strings and they need all be replaced
to say "aaa".

is it faster to replace each one sequentially (i.e. replace first
string to aaa, then do the 2nd, 3rd,...)
, or is it faster to use a regex with ?or? them all and do replace one
shot? (i.e. "1ststr|2ndstr|3rdstr|..." -> aaa)

let's say the sourceString this replacement to be done on is 500k
chars.

Anyone? i suppose the answer will be similar for perl, python, ruby.

btw, the origin of this question is about writing a emacs lisp
function that replace ~250 html named entities to unicode char.

 Xah


From aljosa.mohorovic at gmail.com  Wed Sep 28 05:55:12 2011
From: aljosa.mohorovic at gmail.com (Aljosa Mohorovic)
Date: Wed, 28 Sep 2011 02:55:12 -0700 (PDT)
Subject: oauth2 server implementation
References: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>
	<roy-E5FDBE.20170027092011@news.panix.com>
Message-ID: <862e37e9-f4d2-4423-8d28-485923f1c76b@p11g2000yqe.googlegroups.com>

On Sep 28, 2:17?am, Roy Smith <r... at panix.com> wrote:
> We rolled our own oauth2 client on top of basic urllib calls. ?It's not
> terribly difficult.

i'm asking about oauth2 server implementation, not client.
it's easy to consume oauth2 stuff but what to do when you need to
implement server side stuff?

Aljosa


From rosuav at gmail.com  Wed Sep 28 06:04:43 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 20:04:43 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <CAPTjJmoirhp-1SLgzSV1=Yp_GpAdB1LD1mfco_UE2BMXivHYFQ@mail.gmail.com>

On Wed, Sep 28, 2011 at 7:28 PM, Xah Lee <xahlee at gmail.com> wrote:
> suppose you have 300 different strings and they need all be replaced
> to say "aaa".
>
> is it faster to replace each one sequentially

Before you ask "is it faster", you need to first be sure it's correct.
I would recommend doing all the replaces in a single function call to
avoid risk of overlaps or other issues causing problems.

ChrisA


From r32813 at freescale.com  Wed Sep 28 06:14:08 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Wed, 28 Sep 2011 10:14:08 +0000
Subject: python 2.7.1 HP-UX 11 ia64 built not supporting thread 
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
	<op.v2hrahhax6zn5v@lepton> 
Message-ID: <02EA6D704E30CE499C5071776509A925F599D0@039-SN1MPN1-003.039d.mgd.msft.net>

Hello there,

I included --with-threads option into the configure script calling, which it failed to add the -D_REENTRANT into Makefile. So I manually added this into OPT of the Makefile. I ran make again and generated a new python binary. However, the new binary is still not able to start a new thread from the thread module. 

I reviewed the config.log file, I think this failure has caused the build with threads failed. Cthreads.h header file is missing. Should this be included in my HP UX Compiler or it comes from python source? In python source I only found pythread.h. Anyway, I am only guessing what is wrong. 

Hope to hear some feedback here, whether this is something missing or a bug. 

configure:8407: checking for --with-threads
configure:8427: result: yes
configure:8484: checking for _POSIX_THREADS in unistd.h
configure:8503: result: yes
configure:8508: checking cthreads.h usability
configure:8508: cc +DD64 -I/home/r32813/local/include -c -g  conftest.c >&5
"conftest.c", line 128: error #3696-D: cannot open source file "cthreads.h"
  #include <cthreads.h>
                       ^
1 error detected in the compilation of "conftest.c".

| #define HAVE_LIBDLD 1
| #define _REENTRANT 1
| /* end confdefs.h.  */
| #include <cthreads.h>
configure:8508: result: no
configure:8508: checking for cthreads.h
configure:8508: result: no
configure:8521: checking mach/cthreads.h usability
configure:8521: cc +DD64 -I/home/r32813/local/include -c -g  conftest.c >&5
"conftest.c", line 128: error #3696-D: cannot open source file "mach/cthreads.h"
  #include <mach/cthreads.h>
                            ^

1 error detected in the compilation of "conftest.c".
configure:8521: $? = 2
configure: failed program was:
| /* confdefs.h */
| #define _GNU_SOURCE 1

| #define HAVE_LIBDLD 1
| #define _REENTRANT 1
| /* end confdefs.h.  */
| #include <mach/cthreads.h>
configure:8521: result: no
configure:8521: checking for mach/cthreads.h
configure:8521: result: no
configure:8533: checking for --with-pth
configure:8548: result: no
configure:8556: checking for pthread_create in -lpthread
configure:8572: cc +DD64 -I/home/r32813/local/include -o conftest -g  -L/home/r32813/local/lib -L/home/r32813/Build/2.7.1/Python-2.7.1 conftest.c -l
nsl -lrt -ldld -ldl  -lpthread >&5


Regards,
Wah Meng
Genesis Wafermap Support Ticket: 
To report a problem: http://dyno.freescale.net/Question/QuestionMain3.asp?location=zmy02&category=&tickettype=6820
To request a service: http://dyno.freescale.net/Question/Questionmain3.asp?location=74&category=2&tickettype=6819
Or if it is related to EWM or DSA: http://dyno.freescale.net/Question/Questionmain3.asp?location=ZMY02&tickettype=6539

-----Original Message-----
From: Wong Wah Meng-R32813 
Sent: Wednesday, September 28, 2011 4:37 PM
To: python-list at python.org
Subject: python 2.7.1 built not supporting thread? 


Hello there,

I couldn't detect this problem until I run my application that utilizes thread module in python that I just built on HP-UX 11.31 ia64 using aCC.

Could it be the build did not include enable thread option? _REENTRANT as stated in the README file? If yes, it looks like threading may not work "out of the box". 


>>> thread.start_new_thread(testing, ())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
thread.error: can't start new thread
>>>

Excerpts from README file for python 2.7 build

HP-UX:  When using threading, you may have to add -D_REENTRANT to the
        OPT variable in the top-level Makefile; reported by Pat Knight,
        this seems to make a difference (at least for HP-UX 10.20)
        even though pyconfig.h defines it. This seems unnecessary when
        using HP/UX 11 and later - threading seems to work "out of the
        box".

 



From merlyn at stonehenge.com  Wed Sep 28 06:57:44 2011
From: merlyn at stonehenge.com (Randal L. Schwartz)
Date: Wed, 28 Sep 2011 03:57:44 -0700
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <86bou553yv.fsf@red.stonehenge.com>

>>>>> "Xah" == Xah Lee <xahlee at gmail.com> writes:

Xah> curious question.
Xah> suppose you have 300 different strings and they need all be replaced
Xah> to say "aaa".

And then suppose this isn't the *real* question, but one entirely of
Fiction by Xah Lee.

How helpful do you want to be?

-- 
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn at stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
Smalltalk/Perl/Unix consulting, Technical writing, Comedy, etc. etc.
See http://methodsandmessages.posterous.com/ for Smalltalk discussion


From 1248283536 at qq.com  Wed Sep 28 07:50:04 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Wed, 28 Sep 2011 19:50:04 +0800
Subject: how to run in xp?
Message-ID: <tencent_3C36EA947F825BD94E8366FD@qq.com>

it can run ,but there is still a problem ,nothing in my file.
please run the code in xp+python32
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    url='http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    print (file)
what you get is:

>>> 
b''
b''
b''
>>> 

how to fix it?
------------------ Original ------------------
From:  "Peter Otten"<__peter__ at web.de>;
Date:  Wed, Sep 28, 2011 04:04 PM
To:  "python-list"<python-list at python.org>; 

Subject:  Re: how to run in xp?

 
=?gbk?B?ytjW6rT9zcM=?= wrote:

> #coding:utf-8
> import urllib
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies- \ 
>     by-industry.aspx?exchange='+down+'&render=download'
>     file=urllib.urlopen(url).read() myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> it can run in ubuntu+python2.6 ,when it run in window xp+python32,the
> output is Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 8, in <module>
>     file=urllib.urlopen(url).read()
> AttributeError: 'module' object has no attribute 'urlopen'
> 
> i change it into:
> #coding:utf-8
> import urllib.request
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> the output is :
> Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 9, in <module>
>     myfile.write(file)
> TypeError: must be str, not bytes
> 
> how to make it run in xp+python32?

The problem here is the switch from Python 2 to 3. Python 3 has some 
backwards-incompatible Syntax changes along with changes to classes and 
library organisation. The good news is that there's a tool, 2to3, that can 
handle most of these changes:

$ cat getcode.py
#coding:utf-8   
import urllib   
exchange=['NASDAQ','NYSE','AMEX'] 
for down in exchange:             
    myfile=open('./'+down,'wb')   
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download' 
    file=urllib.urlopen(url).read()                                                                    
    myfile.write(file)                                                                                 
    print 'ok', down
    myfile.close()
$ cp getcode.py getcode3.py
$ 2to3-3.2 getcode3.py -w
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
RefactoringTool: Refactored getcode3.py
--- getcode3.py (original)
+++ getcode3.py (refactored)
@@ -1,10 +1,10 @@
 #coding:utf-8
-import urllib
+import urllib.request, urllib.parse, urllib.error
 exchange=['NASDAQ','NYSE','AMEX']
 for down in exchange:
     myfile=open('./'+down,'wb')
     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
-    file=urllib.urlopen(url).read()
+    file=urllib.request.urlopen(url).read()
     myfile.write(file)
-    print 'ok', down
+    print('ok', down)
     myfile.close()
RefactoringTool: Files that were modified:
RefactoringTool: getcode3.py
$ cat getcode3.py
#coding:utf-8
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'wb')
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print('ok', down)
    myfile.close()
$ python3.2 getcode3.py
ok NASDAQ
ok NYSE
ok AMEX


-- 
http://mail.python.org/mailman/listinfo/python-list
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From devplayer at gmail.com  Wed Sep 28 08:12:31 2011
From: devplayer at gmail.com (DevPlayer)
Date: Wed, 28 Sep 2011 05:12:31 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
Message-ID: <ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>

On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
> rantingrick <rantingr... at gmail.com> wrote:
> > Since, like the bible
> > the zen is self contradicting, any argument utilizing the zen can be
> > defeated utilizing the zen.
>
> And like the Bible, the Zen was created by humans as a joke. If you're
> taking it too seriously, that's your problem.
>
> > If however you want to learn about the accepted rules for formatting
> > code then you need to read "PEP-8"! PEP 8 is our style guide.
>
Contradiction is only seen by narrow perspectve.

Calling the Bible a joke is used to hurt people, not enlighten them.
Those words show bitter arrogance, not constructive critism as it
ignores how others feel about that book. What benefit to others is
gained by calling someones belief a joke? To put the "believers" minds
straight? I think not. I think the unsensitive person who attackes
others beliefs, even if illogical or unrealistic, is after some kind
of self grandizement or to illude themself into thinking "they know
the truth of the universe" and should attack others to prove they do.

Although this is not the place to defend about such things it is also
not the place to attack those same things (that being someone's
faith). There is no real forum to defend a faith or religion, or words
in a book about that, other then where such faiths are in fact
attacked.

However I did laugh at the ironic use of using any-kind of zen to
seriously, even Python's, as that is very unzen-like. That is a
contradiction by it's very own definitions!


From xahlee at gmail.com  Wed Sep 28 08:28:01 2011
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 28 Sep 2011 05:28:01 -0700 (PDT)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
Message-ID: <4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>

On Sep 28, 3:57?am, mer... at stonehenge.com (Randal L. Schwartz) wrote:
> >>>>> "Xah" == Xah Lee <xah... at gmail.com> writes:
>
> Xah> curious question.
> Xah> suppose you have 300 different strings and they need all be replaced
> Xah> to say "aaa".
>
> And then suppose this isn't the *real* question, but one entirely of
> Fiction by Xah Lee.
>
> How helpful do you want to be?

it's a interesting question anyway.

the question originally came from when i was coding elisp of a
function that changes html entities to unicode char literal. The
problem is slightly complicated, involving a few questions about speed
in emacs. e.g. string vs buffer, and much more... i spent several
hours on this but it's probably too boring to detail (but i'll do so
if anyone wishes). But anyway, while digging these questions that's
not clear in my mind, i thought of why not generate a regex or
construct and do it in one shot, and wondered if that'd be faster. But
afterwards, i realized this wouldn't be applicable to my problem
because for my problem each string needs to be changed to a unique
string, not all to the same string.

 Xah


From michele.simionato at gmail.com  Wed Sep 28 08:45:27 2011
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 28 Sep 2011 05:45:27 -0700 (PDT)
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <mailman.1477.1317027357.27778.python-list@python.org>
References: <mailman.1477.1317027357.27778.python-list@python.org>
Message-ID: <29931044.1310.1317213927830.JavaMail.geo-discussion-forums@yqnk41>

plac is based on argparser and it is intended to be much easier to use. See
http://plac.googlecode.com/hg/doc/plac.html

Here is an example of usage.

$ cat vcs.py
class VCS(object):
    "A fictitious version control tool"
    commands = ['checkout', 'commit']
    def checkout(self, url):
        return 'ok'
    def commit(self):
        return 'ok'

if __name__ == '__main__':
    import plac; plac.Interpreter.call(VCS)

The line plac.Interpreter.call instantiates the VCS class by passing to it the arguments in the command line and then calls the appropriate method.

You can use the script as follows:

$ python vcs.py -h
usage: vcs.py [-h] [args [args ...]]

positional arguments:
  args

optional arguments:
  -h, --help  show this help message and exit

$ python vcs.py checkout url
ok
$ python vcs.py commit
ok
plac takes care of parsing the command line, giving the correct error message if you pass wrong arguments or not enough arguments:

$ python vcs.py checkout
usage:  checkout url
 checkout: error: too few arguments

plac can also be used to write command interpreters.


From michele.simionato at gmail.com  Wed Sep 28 08:45:27 2011
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 28 Sep 2011 05:45:27 -0700 (PDT)
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <mailman.1477.1317027357.27778.python-list@python.org>
References: <mailman.1477.1317027357.27778.python-list@python.org>
Message-ID: <29931044.1310.1317213927830.JavaMail.geo-discussion-forums@yqnk41>

plac is based on argparser and it is intended to be much easier to use. See
http://plac.googlecode.com/hg/doc/plac.html

Here is an example of usage.

$ cat vcs.py
class VCS(object):
    "A fictitious version control tool"
    commands = ['checkout', 'commit']
    def checkout(self, url):
        return 'ok'
    def commit(self):
        return 'ok'

if __name__ == '__main__':
    import plac; plac.Interpreter.call(VCS)

The line plac.Interpreter.call instantiates the VCS class by passing to it the arguments in the command line and then calls the appropriate method.

You can use the script as follows:

$ python vcs.py -h
usage: vcs.py [-h] [args [args ...]]

positional arguments:
  args

optional arguments:
  -h, --help  show this help message and exit

$ python vcs.py checkout url
ok
$ python vcs.py commit
ok
plac takes care of parsing the command line, giving the correct error message if you pass wrong arguments or not enough arguments:

$ python vcs.py checkout
usage:  checkout url
 checkout: error: too few arguments

plac can also be used to write command interpreters.


From roy at panix.com  Wed Sep 28 08:53:06 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 08:53:06 -0400
Subject: oauth2 server implementation
References: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>
	<roy-E5FDBE.20170027092011@news.panix.com>
	<862e37e9-f4d2-4423-8d28-485923f1c76b@p11g2000yqe.googlegroups.com>
Message-ID: <roy-6F8862.08530628092011@news.panix.com>

In article 
<862e37e9-f4d2-4423-8d28-485923f1c76b at p11g2000yqe.googlegroups.com>,
 Aljosa Mohorovic <aljosa.mohorovic at gmail.com> wrote:

> On Sep 28, 2:17?am, Roy Smith <r... at panix.com> wrote:
> > We rolled our own oauth2 client on top of basic urllib calls. ?It's not
> > terribly difficult.
> 
> i'm asking about oauth2 server implementation, not client.
> it's easy to consume oauth2 stuff but what to do when you need to
> implement server side stuff?

Oh, my apologies, I read your post too fast and misunderstood what you 
were asking.  I suspect writing an oauth2 provider will be on my plate 
soon, so let me know what you figure out :-)


From xahlee at gmail.com  Wed Sep 28 09:14:33 2011
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 28 Sep 2011 06:14:33 -0700 (PDT)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
Message-ID: <2b90e8b7-2f1e-4f24-9413-56a3fafa897b@z12g2000yqz.googlegroups.com>

here's more detail about the origin of this problem. Relevant to emacs
lisp only.

------------------------------

in the definition of ?replace-regexp-in-string?, there's this comment:

  ;; To avoid excessive consing from multiple matches in long strings,
  ;; don't just call `replace-match' continually.  Walk down the
  ;; string looking for matches of REGEXP and building up a (reversed)
  ;; list MATCHES.  This comprises segments of STRING which weren't
  ;; matched interspersed with replacements for segments that were.
  ;; [For a `large' number of replacements it's more efficient to
  ;; operate in a temporary buffer; we can't tell from the function's
  ;; args whether to choose the buffer-based implementation, though it
  ;; might be reasonable to do so for long enough STRING.]

note: ?For a `large' number of replacements it's more efficient to
operate in a temporary buffer?.

my question is, anyone got some idea, how ?large? is large?

currently, i have a function replace-pairs-in-string which is
implemented by repeatedly calling ?replace-pairs-in-string? like this:

(while (< ii (length pairs))
      (setq mystr (replace-regexp-in-string
                   (elt tempMapPoints ii)
                   (elt (elt pairs ii) 1)
                   mystr t t))
      (setq ii (1+ ii))
      )

When there are 260 pairs of strings to be replaced on a file that's
26k in size, my function takes about 3 seconds (which i think is too
slow). I'm at pain deciding whether my function should be implemented
like this or whether it should create a temp buffer. The problem with
temp buffer is that, if you repeatedly call it, the overhead of
creating buffer is going to make it much slower.

i was actually surprised that replace-regexp-in-string isn't written
in C, which i thought it was.

is there technical reason the replace-regexp-in-string isn't C? (i
suppose only because nobody every did it and the need for speed didn't
suffice?) and also, shouldn't there also be a replace-in-string
(literal, not regex)? because i thought implementing replacement for
string should be much simpler and faster, because buffers comes with
it a whole structure such as ?point?, text properties, buffer names,
buffier modifier, etc.

 Xah

On Sep 28, 5:28?am, Xah Lee <xah... at gmail.com> wrote:
> On Sep 28, 3:57?am, mer... at stonehenge.com (Randal L. Schwartz) wrote:
>
> > >>>>> "Xah" == Xah Lee <xah... at gmail.com> writes:
>
> > Xah> curious question.
> > Xah> suppose you have 300 different strings and they need all be replaced
> > Xah> to say "aaa".
>
> > And then suppose this isn't the *real* question, but one entirely of
> > Fiction by Xah Lee.
>
> > How helpful do you want to be?
>
> it's a interesting question anyway.
>
> the question originally came from when i was coding elisp of a
> function that changes html entities to unicode char literal. The
> problem is slightly complicated, involving a few questions about speed
> in emacs. e.g. string vs buffer, and much more... i spent several
> hours on this but it's probably too boring to detail (but i'll do so
> if anyone wishes). But anyway, while digging these questions that's
> not clear in my mind, i thought of why not generate a regex or
> construct and do it in one shot, and wondered if that'd be faster. But
> afterwards, i realized this wouldn't be applicable to my problem
> because for my problem each string needs to be changed to a unique
> string, not all to the same string.
>
> ?Xah



From rosuav at gmail.com  Wed Sep 28 09:19:32 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 23:19:32 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
Message-ID: <CAPTjJmoX60sP4kRFvts8HjuDNMwqxUBmcy3MoH2DTazwVwF33g@mail.gmail.com>

On Wed, Sep 28, 2011 at 10:28 PM, Xah Lee <xahlee at gmail.com> wrote:
> each string needs to be changed to a unique
> string, not all to the same string.

And you'll find that this is, by and large, the most normal situation.
Folding many strings down to one string is a lot less common. So,
let's have some real-world use cases and then we can talk
recommendations.

ChrisA


From neilc at norwich.edu  Wed Sep 28 09:22:41 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 28 Sep 2011 13:22:41 GMT
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<mailman.1524.1317215975.27778.python-list@python.org>
Message-ID: <9egld1F385U1@mid.individual.net>

On 2011-09-28, Chris Angelico <rosuav at gmail.com> wrote:
> On Wed, Sep 28, 2011 at 10:28 PM, Xah Lee <xahlee at gmail.com> wrote:
>> each string needs to be changed to a unique string, not all to
>> the same string.
>
> And you'll find that this is, by and large, the most normal
> situation. Folding many strings down to one string is a lot
> less common. So, let's have some real-world use cases and then
> we can talk recommendations.

I'd like to know what "string replacement" is supposed to mean in
the context of Python.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From rosuav at gmail.com  Wed Sep 28 09:26:37 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 23:26:37 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <2b90e8b7-2f1e-4f24-9413-56a3fafa897b@z12g2000yqz.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<2b90e8b7-2f1e-4f24-9413-56a3fafa897b@z12g2000yqz.googlegroups.com>
Message-ID: <CAPTjJmpv4vRy1YKGM2cqSRK_-hAVMfFuXdi6c=iwC+gzh3RquA@mail.gmail.com>

On Wed, Sep 28, 2011 at 11:14 PM, Xah Lee <xahlee at gmail.com> wrote:
> (while (< ii (length pairs))
> ? ? ?(setq mystr (replace-regexp-in-string
> ? ? ? ? ? ? ? ? ? (elt tempMapPoints ii)
> ? ? ? ? ? ? ? ? ? (elt (elt pairs ii) 1)
> ? ? ? ? ? ? ? ? ? mystr t t))
> ? ? ?(setq ii (1+ ii))
> ? ? ?)

from __future__ import lisp_syntax

There, that makes it on-topic for the Python list... I guess.

ChrisA


From __peter__ at web.de  Wed Sep 28 09:29:19 2011
From: __peter__ at web.de (Peter Otten)
Date: Wed, 28 Sep 2011 15:29:19 +0200
Subject: how to run in xp?
References: <tencent_3C36EA947F825BD94E8366FD@qq.com>
Message-ID: <j5v7en$t29$1@dough.gmane.org>

=?gbk?B?ytjW6rT9zcM=?= wrote:

> it can run ,but there is still a problem ,nothing in my file.
> please run the code in xp+python32
> import urllib.request, urllib.parse, urllib.error
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     print (file)
> what you get is:
> 
>>>> 
> b''
> b''
> b''
>>>> 
> 
> how to fix it?

I get the expected output, but I'm on Linux. Are you using the latest bugfix 
release (Python 3.2.2)? Can you download the data with your browser?



From roy at panix.com  Wed Sep 28 09:29:57 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 09:29:57 -0400
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<mailman.1524.1317215975.27778.python-list@python.org>
	<9egld1F385U1@mid.individual.net>
Message-ID: <roy-2F5DEE.09295728092011@news.panix.com>

In article <9egld1F385U1 at mid.individual.net>,
 Neil Cerutti <neilc at norwich.edu> wrote:

> On 2011-09-28, Chris Angelico <rosuav at gmail.com> wrote:
> > On Wed, Sep 28, 2011 at 10:28 PM, Xah Lee <xahlee at gmail.com> wrote:
> >> each string needs to be changed to a unique string, not all to
> >> the same string.
> >
> > And you'll find that this is, by and large, the most normal
> > situation. Folding many strings down to one string is a lot
> > less common. So, let's have some real-world use cases and then
> > we can talk recommendations.
> 
> I'd like to know what "string replacement" is supposed to mean in
> the context of Python.

You just need to use "string" in the more generic computer-sciency 
sense, not in the python-data-type sense.

s = "I am an immutable string"
l = list(s)      # now you can pretend strings are mutable
do_stuff_to_string(l)
s = ''.join(l)


From rosuav at gmail.com  Wed Sep 28 09:32:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 23:32:49 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <9egld1F385U1@mid.individual.net>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<mailman.1524.1317215975.27778.python-list@python.org>
	<9egld1F385U1@mid.individual.net>
Message-ID: <CAPTjJmoO-7uVbYZGOVDKL0V49pBMA6isdYxz3-LJtr=9-4VPbg@mail.gmail.com>

On Wed, Sep 28, 2011 at 11:22 PM, Neil Cerutti <neilc at norwich.edu> wrote:
> I'd like to know what "string replacement" is supposed to mean in
> the context of Python.
>

Substring replacement, such as:
>>> "Hello, world!".replace(", "," -- ")
'Hello -- world!'

The str method doesn't accept a list, though, so it won't do
simultaneous replaces. (At least, I don't think it can. Tried it only
in Python 3.2 on Windows.)

ChrisA


From python.list at tim.thechases.com  Wed Sep 28 10:16:59 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 28 Sep 2011 09:16:59 -0500
Subject: Unittest testing assert*() calls rather than methods?
Message-ID: <4E832C5B.1080007@tim.thechases.com>

While I asked this on the Django list as it happened to be with 
some Django testing code, this might be a more generic Python 
question so I'll ask here too.

When performing unittest tests, I have a number of methods of the 
form

   def test_foo(self):
     data = (
       (item1, result1),
       ... #bunch of tests for fence-post errors
       )
     for test, result in data:
       self.assertEqual(process(test), result)

When I run my tests, I only get a tick for running one the one 
test (test_foo), not the len(data) tests that were actually 
performed.  Is there a way for unittesting to report the number 
of passed-assertions rather than the number of test-methods run?

-tkc




From ben+python at benfinney.id.au  Wed Sep 28 10:17:57 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 00:17:57 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <87oby4zr6y.fsf@benfinney.id.au>

DevPlayer <devplayer at gmail.com> writes:

> Calling the Bible a joke is used to hurt people, not enlighten them.

How do you know that?

> Those words show bitter arrogance, not constructive critism

How do you know that?

> as it ignores how others feel about that book.

That strikes me as a good thing; how people feel about a book should not
in any way restrain our criticism of the book.

> What benefit to others is gained by calling someones belief a joke? To
> put the "believers" minds straight? I think not.

I can't speak for the person who wrote that. But when I call a religious
belief a joke, it is to point out the folly of the belief in the pursuit
of convincing people not to hold beliefs I consider to be foolish.

> I think the unsensitive person who attackes others beliefs, even if
> illogical or unrealistic, is after some kind of self grandizement or
> to illude themself into thinking "they know the truth of the universe"
> and should attack others to prove they do.

You are wrong to conflate ?attack others's beliefs? with ?attack
others?.

You are not your beliefs. If your beliefs are shown to be false ? even
ridiculous ? you can distance yourself from those beliefs. It is even
virtuous to do so.

We must always be free to attack any belief, and encourage everyone to
stop taking it as any kind of personal attack.

> Although this is not the place to defend about such things it is also
> not the place to attack those same things (that being someone's
> faith).

I will join you in deploring any attack on a person. But that's not what
you're doing, and I deny your attempt to shield any idea from ridicule,
in any forum.

Ideas don't have feelings, and you don't get to put people in front of
them as human shields against attacking those ideas.

Any idea is and must be open to attack in any forum; those that can't
survive ridicule deserve to go.

-- 
 \              ?Ridicule is the only weapon which can be used against |
  `\       unintelligible propositions.? ?Thomas Jefferson, 1816-07-30 |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Wed Sep 28 10:29:18 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 00:29:18 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
Message-ID: <87k48szqo1.fsf@benfinney.id.au>

Tim Chase <python.list at tim.thechases.com> writes:

>   def test_foo(self):
>     data = (
>       (item1, result1),
>       ... #bunch of tests for fence-post errors
>       )
>     for test, result in data:
>       self.assertEqual(process(test), result)

The sets of data for running the same test we might call ?scenarios?.

> When I run my tests, I only get a tick for running one the one test
> (test_foo), not the len(data) tests that were actually performed.

Worse, if one of the scenarios causes the test to fail, the loop will
end and you won't get the results for the remaining scenarios.

> Is there a way for unittesting to report the number of
> passed-assertions rather than the number of test-methods run?

You can use the third-party ?testscenarios? library
<URL:http://pypi.python.org/pypi/test-scenarios> to generate test cases
at run time, one for each combination of scenarios with test cases on
the class. They will all be run and reported as distinct test cases.

There is even another library integrating this with Django
<URL:http://pypi.python.org/pypi/django-testscenarios>.

-- 
 \     ?Books and opinions, no matter from whom they came, if they are |
  `\     in opposition to human rights, are nothing but dead letters.? |
_o__)                                                  ?Ernestine Rose |
Ben Finney


From ben+python at benfinney.id.au  Wed Sep 28 10:53:40 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 00:53:40 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
Message-ID: <87fwjgzpjf.fsf@benfinney.id.au>

Ben Finney <ben+python at benfinney.id.au> writes:

> You can use the third-party ?testscenarios? library

The URL got a bit mangled. The proper PyPI URL for that library is
<URL:http://pypi.python.org/pypi/testscenarios>.

> to generate test cases at run time, one for each combination of
> scenarios with test cases on the class. They will all be run and
> reported as distinct test cases.
>
> There is even another library integrating this with Django
> <URL:http://pypi.python.org/pypi/django-testscenarios>.

-- 
 \        ?Don't worry about people stealing your ideas. If your ideas |
  `\     are any good, you'll have to ram them down people's throats.? |
_o__)                                                    ?Howard Aiken |
Ben Finney


From drobinow at gmail.com  Wed Sep 28 12:17:05 2011
From: drobinow at gmail.com (David Robinow)
Date: Wed, 28 Sep 2011 12:17:05 -0400
Subject: how to run in xp?
In-Reply-To: <j5v7en$t29$1@dough.gmane.org>
References: <tencent_3C36EA947F825BD94E8366FD@qq.com>
	<j5v7en$t29$1@dough.gmane.org>
Message-ID: <CAF3XjbyEP-Nv7qhGo18=SW-9tsJG5PMYP6DCNO9EiJVU26RBVA@mail.gmail.com>

On Wed, Sep 28, 2011 at 9:29 AM, Peter Otten <__peter__ at web.de> wrote:
> =?gbk?B?ytjW6rT9zcM=?= wrote:
>
>> it can run ,but there is still a problem ,nothing in my file.
>> please run the code in xp+python32
>> import urllib.request, urllib.parse, urllib.error
>> exchange=['NASDAQ','NYSE','AMEX']
>> for down in exchange:
>> ? ? url='http://www.nasdaq.com/screening/companies-by-
> industry.aspx?exchange='+down+'&render=download'
>> ? ? file=urllib.request.urlopen(url).read()
>> ? ? print (file)
>> what you get is:
>>
>>>>>
>> b''
>> b''
>> b''
>>>>>
>>
>> how to fix it?
>
> I get the expected output, but I'm on Linux. Are you using the latest bugfix
> release (Python 3.2.2)? Can you download the data with your browser?
I get the expected output, but I'm on Windows (Vista, Python 3.2.2.)


From alec.taylor6 at gmail.com  Wed Sep 28 12:19:32 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 29 Sep 2011 02:19:32 +1000
Subject: Python 2.5 zlib trouble
In-Reply-To: <CAMuTYXiE6HDP3UATaDd60f9ysgMR1SU-HYDp0Lo2NSvgxe=g+w@mail.gmail.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
	<mailman.1448.1316911903.27778.python-list@python.org>
	<16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>
	<CAMuTYXiE6HDP3UATaDd60f9ysgMR1SU-HYDp0Lo2NSvgxe=g+w@mail.gmail.com>
Message-ID: <CAO+9iGdwWJmacW4RvfQsHAe5OroNRdgRAb+9MCM=8OH7Fg_E3w@mail.gmail.com>

Fix: http://lipyrary.blogspot.com/2011/05/how-to-compile-python-on-ubuntu-1104.html

On Tue, Sep 27, 2011 at 5:04 AM, Benjamin Kaplan
<benjamin.kaplan at case.edu> wrote:
> On Mon, Sep 26, 2011 at 2:16 PM, Jesramz <jesus.ramirez.utexas at gmail.com> wrote:
>>
>> I appreciate all the help, but I am still a little confused. Sorry,
>> I'm a lay person.
>>
>> Should I download zlib1g-dev and install it to get the zlib module?
>>
>> and Alter the configure script to avoid future issues?
>>
>> Also about getting zlib I found the following:
>>
>> "I was able to recompile zlib
>>
>> $./configure --shared
>>
>> then recompile Python 2.5.1; I am now able to import the zlib module.
>>
>> cheers
>>
>> -sg"
>>
>> Does this mean that while in the zlib folder run ./configure shared
>> and then install python?
>> --
>
> Not quite. This person was talking about configuring zlib, not Python.
> Just about every Linux program out there has a ./configure file- it's
> part of GNU Autotools, which many programs use as an easy way to
> compile and install their software. Since the version of zlib on
> Ubuntu Natty doesn't work for Python 2.5, this person just compiled
> their own zlib (calling ./configure --shared; make; make install from
> the zlib *source* folder that they downloaded) and then compiled their
> own Python version (from the Python source folder that they
> downloaded)
>
>
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From willem at toad.stack.nl  Wed Sep 28 13:00:51 2011
From: willem at toad.stack.nl (Willem)
Date: Wed, 28 Sep 2011 17:00:51 +0000 (UTC)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
Message-ID: <slrnj86km3.1egn.willem@toad.stack.nl>

Xah Lee wrote:
) the question originally came from when i was coding elisp of a
) function that changes html entities to unicode char literal. The
) problem is slightly complicated, involving a few questions about speed
) in emacs. e.g. string vs buffer, and much more... i spent several
) hours on this but it's probably too boring to detail (but i'll do so
) if anyone wishes). But anyway, while digging these questions that's
) not clear in my mind, i thought of why not generate a regex or
) construct and do it in one shot, and wondered if that'd be faster. But
) afterwards, i realized this wouldn't be applicable to my problem
) because for my problem each string needs to be changed to a unique
) string, not all to the same string.

In Perl, it would be applicable.  You see, in Perl, you can call a function
in the replacement of the regex substitution, which can then look up the
html entity and return the wanted unicode literal.

I think you can do that in some other languages as well.


SaSW, Willem
-- 
Disclaimer: I am in no way responsible for any of the statements
            made in the above text. For all I know I might be
            drugged or something..
            No I'm not paranoid. You all think I'm paranoid, don't you !
#EOT


From python at mrabarnett.plus.com  Wed Sep 28 13:11:33 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 28 Sep 2011 18:11:33 +0100
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <slrnj86km3.1egn.willem@toad.stack.nl>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
Message-ID: <4E835545.9010802@mrabarnett.plus.com>

On 28/09/2011 18:00, Willem wrote:
> Xah Lee wrote:
> ) the question originally came from when i was coding elisp of a
> ) function that changes html entities to unicode char literal. The
> ) problem is slightly complicated, involving a few questions about speed
> ) in emacs. e.g. string vs buffer, and much more... i spent several
> ) hours on this but it's probably too boring to detail (but i'll do so
> ) if anyone wishes). But anyway, while digging these questions that's
> ) not clear in my mind, i thought of why not generate a regex or
> ) construct and do it in one shot, and wondered if that'd be faster. But
> ) afterwards, i realized this wouldn't be applicable to my problem
> ) because for my problem each string needs to be changed to a unique
> ) string, not all to the same string.
>
> In Perl, it would be applicable.  You see, in Perl, you can call a function
> in the replacement of the regex substitution, which can then look up the
> html entity and return the wanted unicode literal.
>
> I think you can do that in some other languages as well.
>
Including Python...


From ian.g.kelly at gmail.com  Wed Sep 28 13:48:48 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Wed, 28 Sep 2011 11:48:48 -0600
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <CALwzidnfaDbR1DGj+TdN_S=rJKS1ZegpkXBWtmLriLdBw-4KPA@mail.gmail.com>

On Wed, Sep 28, 2011 at 3:28 AM, Xah Lee <xahlee at gmail.com> wrote:
> curious question.
>
> suppose you have 300 different strings and they need all be replaced
> to say "aaa".
>
> is it faster to replace each one sequentially (i.e. replace first
> string to aaa, then do the 2nd, 3rd,...)
> , or is it faster to use a regex with ?or? them all and do replace one
> shot? (i.e. "1ststr|2ndstr|3rdstr|..." -> aaa)
>
> let's say the sourceString this replacement to be done on is 500k
> chars.
>
> Anyone? i suppose the answer will be similar for perl, python, ruby.
>
> btw, the origin of this question is about writing a emacs lisp
> function that replace ~250 html named entities to unicode char.

I haven't timed it at the scale you're talking about, but for Python I
expect regex will be your best bet:

# Python 3.2: Supposing the match strings and replacements are
# in a dict stored as `repls`...

import re

pattern = '|'.join(map(re.escape, repls.keys()))
new_str = re.sub(pattern, lambda m: repls[m.group()], old_str)

The problem with doing 300 str.replace calls is the 300 intermediate
strings that would be created and then collected.

Cheers,
Ian


From * at eli.users.panix.com  Wed Sep 28 15:08:21 2011
From: * at eli.users.panix.com (Eli the Bearded)
Date: Wed, 28 Sep 2011 19:08:21 +0000 (UTC)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
Message-ID: <eli$1109281505@qz.little-neck.ny.us>

In comp.lang.perl.misc, Willem  <willem at toad.stack.nl> wrote:
> In Perl, it would be applicable.  You see, in Perl, you can call a function
> in the replacement of the regex substitution, which can then look up the
> html entity and return the wanted unicode literal.

A function? I'd use a hash.

> I think you can do that in some other languages as well.

Hash / array type substitutions indexed by $1 (or language equivilent)
are probably easy to implement in many languages.

Elijah
------
for really fast, write code to generate a C lexer to do it


From willem at toad.stack.nl  Wed Sep 28 15:11:27 2011
From: willem at toad.stack.nl (Willem)
Date: Wed, 28 Sep 2011 19:11:27 +0000 (UTC)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
	<eli$1109281505@qz.little-neck.ny.us>
Message-ID: <slrnj86sav.276n.willem@toad.stack.nl>

Eli the Bearded wrote:
) In comp.lang.perl.misc, Willem  <willem at toad.stack.nl> wrote:
)> In Perl, it would be applicable.  You see, in Perl, you can call a function
)> in the replacement of the regex substitution, which can then look up the
)> html entity and return the wanted unicode literal.
)
) A function? I'd use a hash.

A function can return a sensible value for unknown substitutions.
In the case where you prebuild a giant regex or-list, that is not an issue,
but I would match html entities generically.


SaSW, Willem
-- 
Disclaimer: I am in no way responsible for any of the statements
            made in the above text. For all I know I might be
            drugged or something..
            No I'm not paranoid. You all think I'm paranoid, don't you !
#EOT


From john at castleamber.com  Wed Sep 28 16:14:51 2011
From: john at castleamber.com (John Bokma)
Date: Wed, 28 Sep 2011 15:14:51 -0500
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
	<eli$1109281505@qz.little-neck.ny.us>
	<slrnj86sav.276n.willem@toad.stack.nl>
Message-ID: <8739fgjuf8.fsf@castleamber.com>

Willem <willem at toad.stack.nl> writes:

> Eli the Bearded wrote:
> ) In comp.lang.perl.misc, Willem  <willem at toad.stack.nl> wrote:
> )> In Perl, it would be applicable.  You see, in Perl, you can call a function
> )> in the replacement of the regex substitution, which can then look up the
> )> html entity and return the wanted unicode literal.
> )
> ) A function? I'd use a hash.
>
> A function can return a sensible value for unknown substitutions.

You can do that also in the RHS of the substitution and still keep it
readable if you use something like

s{..}{

    your
    code
    goes
    here
}ge;

However, a function can be easier on the eye:

s{...}{ some_good_name( ... ) }ge;

-- 
John Bokma                                                               j3b

Blog: http://johnbokma.com/        Perl Consultancy: http://castleamber.com/
Perl for books:    http://johnbokma.com/perl/help-in-exchange-for-books.html


From theg33k at gmail.com  Wed Sep 28 17:06:23 2011
From: theg33k at gmail.com (The Geek)
Date: Wed, 28 Sep 2011 17:06:23 -0400
Subject: new to python question
Message-ID: <CAGE_Tf1GUagGGrWCAJV2kek3KHhHhULjxPcSfB3BiWi1LogO8A@mail.gmail.com>

I'm clearly not understanding something about scope in python...  Any help
is appreciated

In the following script I'm attempting to create 2 Foo objects, for each Foo
object I create 2 Bars and add them to Foo's bar array

Something hokey is occurring with the "foo.bars.append(bar)" line such that
Foo.bars is treated as a "static" (I know python doesn't have statics)

I have a workaround using encapsulation for the bars array but I prefer
would also like to understand the issue.

TIA,
Brad

[SCRIPT]
foos = []

class Foo:
id = 0
bars = []

class Bar:
id = 0

for j in range(0, 2):
foo = Foo()

for i in range(0, 2):
bar = Bar()
bar.id = i
foo.bars.append(bar)
foos.append(foo)

for myFoo in foos:
print("foo id: ", myFoo.id)
for myBar in myFoo.bars:
print ("\tbar id: ", myBar.id)

[/SCRIPT]

[OUTPUT]
python test.py
foo id:  0
        bar id:  0
        bar id:  1
        bar id:  0
        bar id:  1
foo id:  0
        bar id:  0
        bar id:  1
        bar id:  0
        bar id:  1
[/OUTPUT]
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From benjamin.kaplan at case.edu  Wed Sep 28 17:12:13 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 28 Sep 2011 17:12:13 -0400
Subject: new to python question
In-Reply-To: <CAGE_Tf1GUagGGrWCAJV2kek3KHhHhULjxPcSfB3BiWi1LogO8A@mail.gmail.com>
References: <CAGE_Tf1GUagGGrWCAJV2kek3KHhHhULjxPcSfB3BiWi1LogO8A@mail.gmail.com>
Message-ID: <CAMuTYXhAMJyKp=j1MxqR1gN8LBYpHnGCaXgfLU9JUS1DpH=TYA@mail.gmail.com>

On Wed, Sep 28, 2011 at 5:06 PM, The Geek <theg33k at gmail.com> wrote:
> I'm clearly not understanding something about scope in python... ?Any help
> is appreciated
> In the following script I'm attempting to create 2 Foo objects, for each Foo
> object I create 2 Bars and add them to Foo's bar array
> Something hokey is?occurring?with the "foo.bars.append(bar)" line such that
> Foo.bars is treated as a "static" (I know python doesn't have statics)
> I have a workaround using encapsulation for the bars array but I prefer
> would also like to understand the issue.
> TIA,
> Brad
> [SCRIPT]
> foos = []
> class Foo:
> id = 0
> bars = []
> class Bar:
> id = 0
> for j in range(0, 2):
> foo = Foo()
> for i in range(0, 2):
> bar = Bar()
> bar.id = i
> foo.bars.append(bar)
> foos.append(foo)
> for myFoo in foos:
> print("foo id: ", myFoo.id)
> for myBar in myFoo.bars:
> print ("\tbar id: ", myBar.id)
> [/SCRIPT]


It's a pretty common gotcha for people coming from other languages.
Everything declared in the class scope becomes an attribute of the
class.
>>> class Foo(object) :
...    a = 3
...    def b() : pass
...
>>> dir(Foo)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribut
e__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_e
x__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '_
_weakref__', 'a', 'b']

Mutating those objects mutates the attribute of the class, which is
visible to all instances of the class.

In order to get an instance of a class, you have to add the field to
the instance of the class instead of to the class itself.

class Bar(object) :
    def ___init__(self) :
        self.a = 3


From tjreedy at udel.edu  Wed Sep 28 17:23:50 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 28 Sep 2011 17:23:50 -0400
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <j6039d$co9$1@dough.gmane.org>

On 9/28/2011 5:28 AM, Xah Lee wrote:
> curious question.
>
> suppose you have 300 different strings and they need all be replaced
> to say "aaa".
>
> is it faster to replace each one sequentially (i.e. replace first
> string to aaa, then do the 2nd, 3rd,...)
> , or is it faster to use a regex with ?or? them all and do replace one
> shot? (i.e. "1ststr|2ndstr|3rdstr|..." ->  aaa)

Here the problem is replace multiple random substrings with one random 
substring that could create new matches. I would start with the re 'or' 
solution.

> btw, the origin of this question is about writing a emacs lisp
> function that replace ~250 html named entities to unicode char.

As you noted this is a different problem in that there is a different 
replacement for each. Also, the substrings being searched for are not 
random but have a distinct and easily recognized structure. The 
replacement cannot create a new match. So the multiple scan approach 
*could* work.

Unspecified is whether the input is unicode or ascii bytes. If the 
latter I might copy to a bytearray (mutable), scan forward, replace 
entity defs with utf-8 encoding of the corresponding unicode (with a 
dict lookup, and which I assume are *always* fewer chars), and shift 
other chars to close any gaps created.

If the input is unicode, I might do the same with array.array (which is 
where bytearray came from). Or I might use the standard idiom of 
constructing a list of pieces of the original, with replacements, and 
''.join() at the end.

-- 
Terry Jan Reedy




From ethan at stoneleaf.us  Wed Sep 28 17:26:09 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 28 Sep 2011 14:26:09 -0700
Subject: syntactic sugar for def?
Message-ID: <4E8390F1.9060207@stoneleaf.us>

I remember that 'class' is sugar for type(....).

I don't remember if 'def' is sugar for something besides lambda.

Any clues for me?  Heck, I'll even be grateful for outright answers!

~Ethan~


From ian.g.kelly at gmail.com  Wed Sep 28 17:36:08 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Wed, 28 Sep 2011 15:36:08 -0600
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <CALwzidk=PRFf2bxEywYC=iJ1N+hERMhqQYovZNgJBjq8gXbEKA@mail.gmail.com>

On Wed, Sep 28, 2011 at 3:26 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> I remember that 'class' is sugar for type(....).
>
> I don't remember if 'def' is sugar for something besides lambda.
>
> Any clues for me? ?Heck, I'll even be grateful for outright answers!

If you mean is there a way to create functions using reflection, you
can use types.FunctionType.  Like type() requires a dict,
FunctionType() requires a code object that must first be compiled.

Cheers,
Ian


From arnodel at gmail.com  Wed Sep 28 17:37:12 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 28 Sep 2011 22:37:12 +0100
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>

On 28 September 2011 22:26, Ethan Furman <ethan at stoneleaf.us> wrote:
> I remember that 'class' is sugar for type(....).
>
> I don't remember if 'def' is sugar for something besides lambda.
>
> Any clues for me? ?Heck, I'll even be grateful for outright answers!

It's not really sugar.  But I think you mean something like this:


>>> class A: pass
...
>>> type(A)
<class 'type'>
>>> type is type(A)
True

So the closest you get for functions will be:

>>> def f(): pass
...
>>> type(f)
<class 'function'>

Try help(type(f)) to see how to use it to create a function object.
The problem is that you need to provide a code object, and the easiest
way to create a code object is to use a def statement :)

HTH

-- 
Arnaud


From tayfun92_kayhan at yahoo.com  Wed Sep 28 17:49:21 2011
From: tayfun92_kayhan at yahoo.com (Tayfun Kayhan)
Date: Wed, 28 Sep 2011 14:49:21 -0700 (PDT)
Subject: A trivial question
Message-ID: <1317246561.85326.YahooMailNeo@web120310.mail.ne1.yahoo.com>

I accidentally wrote such a code (below) while trying to write sth else for my application but i am now just wondering much how to run the class Foo, if it is possible. Is not it weird that Python does not give any error when I run it ? Sorry for that it's pretty unimportant question according to the other questions being asked here :D

def trial():
class Foo(object):
def __init__(self):
print("Hello, world!")
trial() # not worked, as expected.
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From ckaynor at zindagigames.com  Wed Sep 28 17:51:00 2011
From: ckaynor at zindagigames.com (Chris Kaynor)
Date: Wed, 28 Sep 2011 14:51:00 -0700
Subject: syntactic sugar for def?
In-Reply-To: <CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>
References: <4E8390F1.9060207@stoneleaf.us>
	<CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>
Message-ID: <CALvWhxvi3vb5uXpEUqeLkhYa2322wPi+DKRC=Goa-oTnftV8cw@mail.gmail.com>

On Wed, Sep 28, 2011 at 2:37 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> On 28 September 2011 22:26, Ethan Furman <ethan at stoneleaf.us> wrote:
>> I remember that 'class' is sugar for type(....).
>>
>> I don't remember if 'def' is sugar for something besides lambda.
>>
>> Any clues for me? ?Heck, I'll even be grateful for outright answers!
>
> It's not really sugar. ?But I think you mean something like this:
>
>
>>>> class A: pass
> ...
>>>> type(A)
> <class 'type'>
>>>> type is type(A)
> True
>
> So the closest you get for functions will be:
>
>>>> def f(): pass
> ...
>>>> type(f)
> <class 'function'>
>
> Try help(type(f)) to see how to use it to create a function object.
> The problem is that you need to provide a code object, and the easiest
> way to create a code object is to use a def statement :)

I would say compile isn't too much harder to use:
>>> c = compile('a = 123', 'test', 'exec')
>>> d = {}
>>> f = types.FunctionType(c, d, 'test')
>>> f()
>>> print d
{'a': 123}

Although it appears you get all of the variables defined as global
apparently (try "f = types.FunctionType(c, globals(), 'test')"
instead).

>
> HTH
>
> --
> Arnaud
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tayfun92_kayhan at yahoo.com  Wed Sep 28 17:53:59 2011
From: tayfun92_kayhan at yahoo.com (Tayfun Kayhan)
Date: Wed, 28 Sep 2011 14:53:59 -0700 (PDT)
Subject: A Trivial Question
Message-ID: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>

I accidentally wrote such a code (below) while trying to write sth else for my application but i am now just wondering much how to run the class Foo, if it is possible. Is not it weird that Python does not give any error when I run it ? Sorry for that it's pretty unimportant question according to the other questions being asked here :D

def trial():
class Foo(object):
def __init__(self):
print("Hello, world!")
trial() # not worked, as expected.
-------------- next part --------------
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From tjreedy at udel.edu  Wed Sep 28 18:03:48 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 28 Sep 2011 18:03:48 -0400
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <4E832C5B.1080007@tim.thechases.com>
References: <4E832C5B.1080007@tim.thechases.com>
Message-ID: <j605ka$sps$1@dough.gmane.org>

On 9/28/2011 10:16 AM, Tim Chase wrote:

> When performing unittest tests, I have a number of methods of the form
>
> def test_foo(self):
> data = (
> (item1, result1),
> ... #bunch of tests for fence-post errors
> )
> for test, result in data:
> self.assertEqual(process(test), result)
>
> When I run my tests, I only get a tick for running one the one test
> (test_foo), not the len(data) tests that were actually performed. Is
> there a way for unittesting to report the number of passed-assertions
> rather than the number of test-methods run?

In my view, unittest, based on JUnit from Java, is both overkill and 
inadequate for simple function testing of multiple input-output pairs. 
So I wrote my own short function test function that does just what I 
want, and which I can change if I change what I want.

Ben has described the combinatorial explosion solution. But if I were 
using unittest, I might do something like the following:

   def test_foo(self):
     data = (
       (item1, result1),
       ... #bunch of tests for fence-post errors
       )
     errors = []
     for input, expected in data:
       try:
         actual = process(input)
         if actual != expected: errors.append(input, expected, actual)
       except Exception as e:
         errors.append(input, expected, actual)
     self.assertEqual((0,[]), (len(errors),errors))

except that I would write a functest(func, iopairs) that returned the 
error pair. (This is essentially what I have done for for myself.)  I am 
presuming that one can run unittest so that it prints the unequal items.

-- 
Terry Jan Reedy



From clp2 at rebertia.com  Wed Sep 28 18:06:14 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 28 Sep 2011 15:06:14 -0700
Subject: A Trivial Question
In-Reply-To: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
References: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
Message-ID: <CAMZYqRTMYJEbfeGTLgUiN2u5PO0BCuOUVasbP2R18c=bw+kyMg@mail.gmail.com>

On Wed, Sep 28, 2011 at 2:53 PM, Tayfun Kayhan
<tayfun92_kayhan at yahoo.com> wrote:
> I accidentally wrote such a code (below) while trying to write sth else for
> my application but i am now just wondering much how to run the class Foo, if
> it is possible. Is not it weird that Python does not give any error when I
> run it ? Sorry for that it's pretty unimportant question according to the
> other questions being asked here :D
> def trial():
>     class Foo(object):
>         def __init__(self):
>             print("Hello, world!")
> trial() # not worked, as expected.

Right now, you've merely defined a class in the local scope of a
function, which is perfectly valid, although you don't take advantage
of this, so there's no particular reason to put the class definition
inside trial(). Foo.__init__() only gets called when you create an
instance of Foo, which you aren't doing currently, hence why "Hello,
world!" isn't printed.

Try this:

def trial():
    class Foo(object):
        def __init__(self):
            print("Hello, world!")
    Foo()
trial()


Or this:

class Foo(object):
    def __init__(self):
        print("Hello, world!")

def trial():
    Foo()
trial()


Cheers,
Chris
--
http://rebertia.com


From nad at acm.org  Wed Sep 28 18:21:25 2011
From: nad at acm.org (Ned Deily)
Date: Wed, 28 Sep 2011 15:21:25 -0700
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <nad-47A451.15212528092011@news.gmane.org>

In article <4e82a1a1$0$29965$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> On Tue, 27 Sep 2011 14:32:43 -0700, Wanderer wrote:
> > I need to stay in sink with the rest of the company which is still using
> > 2.6 flavors. There was some investigation into going to Python 3 but not
> > enough of the libraries we use were available. I'll install 2.6.6. I
> > don't think the security stuff really effects me. I think it is strange
> > to release a security update but not really expect people to use it.
> 
> 
> More likely the person who builds the Windows installers just hasn't made 
> a new release yet.
> 
> The Python development team is relatively small and chronically busy: too 
> much to do and not enough time to do it. As I understand it, most of them 
> use Linux, so I'm afraid that Windows sometimes takes a back seat. (At 
> least it's not Mac OS, which is stuck riding in the boot of the car, or 
> the other semi-supported OSes, which are on a skateboard desperately 
> hanging onto the bumper trying not to be left behind.)

No, it was a deliberate decision.  After a release is in security-fix 
mode only, we don't build Windows or Mac OS X installers for them.  The 
emphasis is on the actively maintained release branches, currently 3.2.x 
and 2.7.x.  If third-party distributors want to support their users with 
binary installers, that is of course their option.

"Python 2.6.7 is a security-fix only source release for Python 2.6.6, 
fixing several reported security issues. Python 2.6.7 was released on 
June 3, 2011.

Python 2.6 is now in security-fix-only mode; no new features are being 
added, and no new bug fix releases are planned. We intend to provide 
source-only security fixes for the Python 2.6 series until October 2013 
(five years after the 2.6 final release). For ongoing maintenance 
releases, please see the Python 2.7 series."

http://www.python.org/getit/releases/2.6.7/

(And I think you may be just slightly mischaracterizing the status of 
both Mac OS X and Windows support.)

-- 
 Ned Deily,
 nad at acm.org



From gagsl-py2 at yahoo.com.ar  Wed Sep 28 18:30:01 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 28 Sep 2011 19:30:01 -0300
Subject: syntactic sugar for def?
References: <4E8390F1.9060207@stoneleaf.us>
	<CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>
	<CALvWhxvi3vb5uXpEUqeLkhYa2322wPi+DKRC=Goa-oTnftV8cw@mail.gmail.com>
Message-ID: <op.v2jh4bnbx6zn5v@lepton>

En Wed, 28 Sep 2011 18:51:00 -0300, Chris Kaynor  
<ckaynor at zindagigames.com> escribi?:

> On Wed, Sep 28, 2011 at 2:37 PM, Arnaud Delobelle <arnodel at gmail.com>  
> wrote:
>> On 28 September 2011 22:26, Ethan Furman <ethan at stoneleaf.us> wrote:
>>> I remember that 'class' is sugar for type(....).
>>>
>>> I don't remember if 'def' is sugar for something besides lambda.
>>>
>>> Any clues for me?  Heck, I'll even be grateful for outright answers!
>>
>> It's not really sugar.  But I think you mean something like this:
>>
>>
>>>>> class A: pass
>> ...
>>>>> type(A)
>> <class 'type'>
>>>>> type is type(A)
>> True
>>
>> So the closest you get for functions will be:
>>
>>>>> def f(): pass
>> ...
>>>>> type(f)
>> <class 'function'>
>>
>> Try help(type(f)) to see how to use it to create a function object.
>> The problem is that you need to provide a code object, and the easiest
>> way to create a code object is to use a def statement :)
>
> I would say compile isn't too much harder to use:
>>>> c = compile('a = 123', 'test', 'exec')
>>>> d = {}
>>>> f = types.FunctionType(c, d, 'test')
>>>> f()
>>>> print d
> {'a': 123}
>
> Although it appears you get all of the variables defined as global
> apparently (try "f = types.FunctionType(c, globals(), 'test')"
> instead).

I know no way of compiling a function body alone. Suppose you have this  
function:

def foo(x):
   print x
   y = 2*x
   return y

py> compile("  print x\n  y = 2*x\n  return y", "<string>", "exec")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "<string>", line 1
     print x
     ^
IndentationError: unexpected indent
py> compile("print x\ny = 2*x\nreturn y", "<string>", "exec")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "<string>", line 3
SyntaxError: 'return' outside function

If you include the 'def' statement in the source string, the resulting  
code object does not represent the function itself, but a "module"  
defining it:

py> f = FunctionType(compile("def foo(x):\n print x\n y = 2*x\n return  
y\n",
...       "<string>", "exec"), globals(), "foo")
py> f(3)
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: <module>() takes no arguments (1 given)
py> dis.dis(f)
   1           0 LOAD_CONST               0 (<code object foo at 00C0FAD0,  
file "<string>", line 1>)
               3 MAKE_FUNCTION            0
               6 STORE_NAME               0 (foo)
               9 LOAD_CONST               1 (None)
              12 RETURN_VALUE

To get at the actual function code, one should use  
f.func_code.co_consts[0]; this would be the 'code' parameter for  
types.FunctionType. Very complicated, really; nothing can beat the 'def'  
statement for defining a function ;)

-- 
Gabriel Genellina



From ericsnowcurrently at gmail.com  Wed Sep 28 18:38:26 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Wed, 28 Sep 2011 16:38:26 -0600
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <CALFfu7CgRZFNmrEfwqMp=nDwfrH_Doqs0CZPFNpZT=3pEg+Hgg@mail.gmail.com>

On Wed, Sep 28, 2011 at 3:26 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> I remember that 'class' is sugar for type(....).
>
> I don't remember if 'def' is sugar for something besides lambda.

This is something I have thought about a lot since PyCon this year.  I
apologize in advance.  <wink>

Since 3.0, class statements are syntactic sugar for some extra steps
beyond "meta(...)" [1].  In CPython this is facilitated through the
"hidden" __build_class__() builtin[2].  We have the __import__()
builtin for customizing module creation. But, as you asked, what about
functions?

Currently there isn't a way to customize function creation.  There is
no __build_function__() builtin.  The best you can do is, like others
have said, directly call FunctionType(...) or type(f)(...) where f is
an existing function.

I expect that if there were a __build_function__, it would wrap the
code that is currently run for the MAKE_FUNCTION/MAKE_CLOSURE
opcodes[3].

Also, both modules and classes have mechanisms built-in to allow for
customization in certain parts of the creation process (PEP 302[4] and
metaclasses[5], respectively).  Functions lack this as well, though
there hasn't been a big clamor for it.  :)  Nick Coghlan proposed an
interesting idea for this in March[6], with some later follow-up[7].
Nothing much came of it though.

Definitely an interesting topic, which has led me to learn a lot about
Python and CPython.

-eric

[1] http://www.python.org/dev/peps/pep-3115/
     http://mail.python.org/pipermail/python-3000/2007-March/006338.html
[2] http://hg.python.org/cpython/file/default/Python/bltinmodule.c#l35
[3] http://hg.python.org/cpython/file/default/Python/ceval.c#l2680
[4] http://www.python.org/dev/peps/pep-0302/
     http://docs.python.org/release/2.3.5/whatsnew/section-pep302.html
     http://docs.python.org/dev/reference/simple_stmts.html#the-import-statement
[5] http://docs.python.org/dev/reference/datamodel.html#customizing-class-creation
     http://www.python.org/doc/essays/metaclasses/
[6] http://mail.python.org/pipermail/python-ideas/2011-March/009391.html
[7] http://mail.python.org/pipermail/python-ideas/2011-March/009625.html
     http://mail.python.org/pipermail/python-ideas/2011-April/009765.html

>
> Any clues for me? ?Heck, I'll even be grateful for outright answers!
>
> ~Ethan~
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tjreedy at udel.edu  Wed Sep 28 19:01:11 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 28 Sep 2011 19:01:11 -0400
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <j608vt$hcs$1@dough.gmane.org>

On 9/28/2011 5:26 PM, Ethan Furman wrote:

> I don't remember if 'def' is sugar for something besides lambda.

That is a bit backwards.
   lambda x: expr(x)
is syntactic sugar for
   def <lambda>(x): return expr(x)
   del <lambda>
;-)

-- 
Terry Jan Reedy



From greg.ewing at canterbury.ac.nz  Wed Sep 28 19:01:27 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 29 Sep 2011 12:01:27 +1300
Subject: Wrote a new library - Comments and suggestions please!
In-Reply-To: <4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <9ehnaaF35hU1@mid.individual.net>

Steven D'Aprano wrote:

> I googled on "SAS PROC FREQ" and found this:
> 
> http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/default/procstat_freq_sect006.htm
> 
> Documentation like that really makes me appreciate the sterling work done on
> Python's docs.

I think you have to read it in context. A couple of levels up
there is a section called "The FREQ Procedure" which seems to
explain more about what's going on, including examples. (I
didn't look too closely at it, though, in case my eyes started
to bleed...)

-- 
Greg


From tim at akwebsoft.com  Wed Sep 28 19:26:51 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Wed, 28 Sep 2011 15:26:51 -0800
Subject: Suggested coding style
In-Reply-To: <ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <20110928232651.GT19422@johnsons-web.com>

* DevPlayer <devplayer at gmail.com> [110928 04:31]:
> On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
> > rantingrick <rantingr... at gmail.com> wrote:
> > > Since, like the bible
> > > the zen is self contradicting, any argument utilizing the zen can be
> > > defeated utilizing the zen.
> >
> > And like the Bible, the Zen was created by humans as a joke. If you're
> > taking it too seriously, that's your problem.
> >
> > > If however you want to learn about the accepted rules for formatting
> > > code then you need to read "PEP-8"! PEP 8 is our style guide.
> >
> Contradiction is only seen by narrow perspectve.
> 
> Calling the Bible a joke is used to hurt people, not enlighten them.
> Those words show bitter arrogance, not constructive critism as it
> ignores how others feel about that book. What benefit to others is
> gained by calling someones belief a joke? 

 My wife and I are devout christians, but not fundamentalist. We
 would not take rantingrick too seriously. If _you_ take him
 seriously, you're just giving him 'street cred'.

-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From nobody at nowhere.com  Wed Sep 28 20:10:38 2011
From: nobody at nowhere.com (Nobody)
Date: Thu, 29 Sep 2011 01:10:38 +0100
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1543.1317248503.27778.python-list@python.org>
Message-ID: <pan.2011.09.29.00.10.37.975000@nowhere.com>

On Wed, 28 Sep 2011 15:21:25 -0700, Ned Deily wrote:

> No, it was a deliberate decision.  After a release is in security-fix 
> mode only, we don't build Windows or Mac OS X installers for them.

But you continue to offer the installers for the unfixed version.



From steve+comp.lang.python at pearwood.info  Wed Sep 28 20:16:30 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 10:16:30 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
Message-ID: <4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>

Tim Chase wrote:

> While I asked this on the Django list as it happened to be with
> some Django testing code, this might be a more generic Python
> question so I'll ask here too.
> 
> When performing unittest tests, I have a number of methods of the
> form
> 
>    def test_foo(self):
>      data = (
>        (item1, result1),
>        ... #bunch of tests for fence-post errors
>        )
>      for test, result in data:
>        self.assertEqual(process(test), result)
> 
> When I run my tests, I only get a tick for running one the one
> test (test_foo), not the len(data) tests that were actually
> performed.  Is there a way for unittesting to report the number
> of passed-assertions rather than the number of test-methods run?

I used to ask the same question, but then I decided that if I wanted each
data point to get its own tick, I should bite the bullet and write an
individual test for each.

If you really care, you could subclass unittest.TestCase, and then cause
each assert* method to count how often it gets called. But really, how much
detailed info about *passed* tests do you need? 

If you are writing loops inside tests, you might find this anecdote useful:

http://mail.python.org/pipermail/python-list/2011-April/1270640.html



-- 
Steven



From cmpython at gmail.com  Wed Sep 28 20:39:52 2011
From: cmpython at gmail.com (CM)
Date: Wed, 28 Sep 2011 17:39:52 -0700 (PDT)
Subject: options for plotting points on geographic map
Message-ID: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>

Recommendations sought for using Python to plot points/custom markers
(and maybe other things?) on a map of an area of the U.S. of maybe 100
miles radius.  (This would be a "political" map showing towns, such as
from Google Maps or Mapquest, and not a "physical" map).  I'll need to
place markers or something based on zip codes.

I see there is pymaps, a Python wrapper for Google Maps.  I may try
that but it seems to be barely documented and would require making a
webpage with javascript to display the map, whereas I'd probably
prefer a desktop app for this--though I'd consider a web page (it's
probably easier than I think).

I already use Matplotlib, but its Basemap seems to be only for
physical geography needs.

Are there other options one might recommend?  (It is a little hard to
Google for this given the map() function).

Thanks,
Che


From zzzzysilence at gmail.com  Wed Sep 28 20:42:09 2011
From: zzzzysilence at gmail.com (Bertha Jonanna)
Date: Wed, 28 Sep 2011 17:42:09 -0700 (PDT)
Subject: red bull hats, snapback hats, hello kitty hats, monster energy hats
	of http://www.currenthats.com/
Message-ID: <8edb383c-c6c7-4bc4-8b54-13c94a5c6493@18g2000yqz.googlegroups.com>

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promotional shop from monster energy hats. It was authorized to
provide red bull hats?snapback hats?hello kitty hats and the
fashionable sports items to meet red bull hats Fans shopping needs.


From zzzzysilence at gmail.com  Wed Sep 28 20:46:10 2011
From: zzzzysilence at gmail.com (Bertha Jonanna)
Date: Wed, 28 Sep 2011 17:46:10 -0700 (PDT)
Subject: red bull hats, snapback hats, hello kitty hats, monster energy hats
	of http://www.currenthats.com/
Message-ID: <c99fe5dc-775c-4d55-91cd-d0900e7ce5d2@h34g2000yqd.googlegroups.com>

Welcome to the www. currenthats.com,. The currenthats.com is a
promotional shop from monster energy hats. It was authorized to
provide red bull hats?snapback hats?hello kitty hats and the
fashionable sports items to meet red bull hats Fans shopping needs.


From roy at panix.com  Wed Sep 28 20:49:24 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 20:49:24 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-DF6FAC.20492428092011@news.panix.com>

In article <4e83b8e0$0$29972$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> If you are writing loops inside tests, you might find this anecdote useful:
> 
> http://mail.python.org/pipermail/python-list/2011-April/1270640.html

On the other hand, the best test is one that gets written.  I will often 
write tests that I know do not meet the usual standards of purity and 
wholesomeness.  Here's a real-life example:

    for artist in artists:
        name = artist['name']
        self.assertIsInstance(name, unicode)
        name = name.lower()
        # Due to fuzzy matching, it's not strictly guaranteed that the 
        # following assertion is true, but it works in this case.  
        self.assertTrue(name.startswith(term), (name, term))

Could I have written the test without the loop?  Probably.  Would it 
have been a better test?  I guess, at some level, probably.  And, of 
course, the idea of a "not strictly guaranteed" assertion is probably 
enough to make me lose my Unit Tester's Guild Secret Decoder Ring 
forever :-)

But, the test was quick and easy to write, and provides value.  I could 
have spent twice as long writing a better test, and it would have 
provided a little more value, but certainly not double.  More 
importantly, had I spent the extra time writing the better test, I might 
have not had enough time to write all the other tests I wrote that day.

Sometimes good enough is good enough.


From jeanpierreda at gmail.com  Wed Sep 28 20:50:03 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Wed, 28 Sep 2011 20:50:03 -0400
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJLMV+Wez60xPzKyrFE1nrLw+H=iHZ5QxjEXp-1wngpHbQ@mail.gmail.com>

> I used to ask the same question, but then I decided that if I wanted each
> data point to get its own tick, I should bite the bullet and write an
> individual test for each.

Nearly the entire re module test suite is a list of tuples. If it was
instead a bunch of TestCase classes, there'd be a lot more boilerplate
to write. (At a bare minimum, there'd be two times as many lines, and
all the extra lines would be identical...)

Why is writing boilerplate for a new test a good thing? It discourages
the authorship of tests. Make it as easy as possible by e.g. adding a
new thing to whatever you're iterating over. This is, for example, why
the nose test library has a decorator for generating a test suite from
a generator.

Devin

On Wed, Sep 28, 2011 at 8:16 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Tim Chase wrote:
>
>> While I asked this on the Django list as it happened to be with
>> some Django testing code, this might be a more generic Python
>> question so I'll ask here too.
>>
>> When performing unittest tests, I have a number of methods of the
>> form
>>
>> ? ?def test_foo(self):
>> ? ? ?data = (
>> ? ? ? ?(item1, result1),
>> ? ? ? ?... #bunch of tests for fence-post errors
>> ? ? ? ?)
>> ? ? ?for test, result in data:
>> ? ? ? ?self.assertEqual(process(test), result)
>>
>> When I run my tests, I only get a tick for running one the one
>> test (test_foo), not the len(data) tests that were actually
>> performed. ?Is there a way for unittesting to report the number
>> of passed-assertions rather than the number of test-methods run?
>
> I used to ask the same question, but then I decided that if I wanted each
> data point to get its own tick, I should bite the bullet and write an
> individual test for each.
>
> If you really care, you could subclass unittest.TestCase, and then cause
> each assert* method to count how often it gets called. But really, how much
> detailed info about *passed* tests do you need?
>
> If you are writing loops inside tests, you might find this anecdote useful:
>
> http://mail.python.org/pipermail/python-list/2011-April/1270640.html
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From roy at panix.com  Wed Sep 28 20:52:31 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 20:52:31 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
Message-ID: <roy-0A695E.20523128092011@news.panix.com>

In article <87k48szqo1.fsf at benfinney.id.au>,
 Ben Finney <ben+python at benfinney.id.au> wrote:

> Worse, if one of the scenarios causes the test to fail, the loop will
> end and you won't get the results for the remaining scenarios.

Which, depending on what you're doing, may or may not be important.  In 
many cases, there's only two states of interest:

1) All tests pass

2) Anything else


From steve+comp.lang.python at pearwood.info  Wed Sep 28 21:14:04 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 11:14:04 +1000
Subject: [OT] Benefit and belief [was Re: Suggested coding style]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>

DevPlayer wrote:

> On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
>> And like the Bible, the Zen was created by humans as a joke. If you're
>> taking it too seriously, that's your problem.
[...]
> Calling the Bible a joke is used to hurt people, not enlighten them.
> Those words show bitter arrogance, not constructive critism as it
> ignores how others feel about that book. What benefit to others is 
> gained by calling someones belief a joke? 

It is the same benefit as the little boy who pointed out that the Emperor
was not wearing any clothes. (In real life, the story was called "The
Little Boy Who Said The Emperor Wasn't Wearing Any Clothes, and Got
Arrested and Thrown in Prison Together With His Parents for Insulting The
Emperor".)


> To put the "believers" minds 
> straight? I think not. I think the unsensitive person who attackes
> others beliefs, even if illogical or unrealistic, is after some kind
> of self grandizement or to illude themself into thinking "they know
> the truth of the universe" and should attack others to prove they do.

There is a difference between attacking ideas and attacking people.

"The Bible is a joke" attacks the idea.

"Insensitive people after self-aggrandisement deluding themselves" attacks
the person.

We live in a world where religion is privileged, where governments pander to
the most sick and twisted, hateful, bigoted beliefs because of religion,
where organised conspiracies to support and protect child molesters and
sexual predators are nevertheless looked up to as sources of morality.

There are some ideas that are simply incompatible with civilization, and the
idea that religious beliefs should be beyond criticism is one of them.
Forget money, or even the love of money. The idea that one mustn't
criticise another person's beliefs is the root of all evil.



-- 
Steven



From jeanpierreda at gmail.com  Wed Sep 28 21:40:27 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Wed, 28 Sep 2011 21:40:27 -0400
Subject: [OT] Benefit and belief [was Re: Suggested coding style]
In-Reply-To: <4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJKRaFyQbQ=EVBOE0YoOCmCTEXwh+t7W7f_uthbM-tY=cA@mail.gmail.com>

> Forget money, or even the love of money. The idea that one mustn't
> criticise another person's beliefs is the root of all evil.

This was a technical discussion, and calling the bible a joke was not
necessary at all. It creates a hostile atmosphere.

Can't you pick somewhere else to attack Christianity?

Devin

On Wed, Sep 28, 2011 at 9:14 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> DevPlayer wrote:
>
>> On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
>>> And like the Bible, the Zen was created by humans as a joke. If you're
>>> taking it too seriously, that's your problem.
> [...]
>> Calling the Bible a joke is used to hurt people, not enlighten them.
>> Those words show bitter arrogance, not constructive critism as it
>> ignores how others feel about that book. What benefit to others is
>> gained by calling someones belief a joke?
>
> It is the same benefit as the little boy who pointed out that the Emperor
> was not wearing any clothes. (In real life, the story was called "The
> Little Boy Who Said The Emperor Wasn't Wearing Any Clothes, and Got
> Arrested and Thrown in Prison Together With His Parents for Insulting The
> Emperor".)
>
>
>> To put the "believers" minds
>> straight? I think not. I think the unsensitive person who attackes
>> others beliefs, even if illogical or unrealistic, is after some kind
>> of self grandizement or to illude themself into thinking "they know
>> the truth of the universe" and should attack others to prove they do.
>
> There is a difference between attacking ideas and attacking people.
>
> "The Bible is a joke" attacks the idea.
>
> "Insensitive people after self-aggrandisement deluding themselves" attacks
> the person.
>
> We live in a world where religion is privileged, where governments pander to
> the most sick and twisted, hateful, bigoted beliefs because of religion,
> where organised conspiracies to support and protect child molesters and
> sexual predators are nevertheless looked up to as sources of morality.
>
> There are some ideas that are simply incompatible with civilization, and the
> idea that religious beliefs should be beyond criticism is one of them.
> Forget money, or even the love of money. The idea that one mustn't
> criticise another person's beliefs is the root of all evil.
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From gagsl-py2 at yahoo.com.ar  Wed Sep 28 21:49:25 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 28 Sep 2011 22:49:25 -0300
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1543.1317248503.27778.python-list@python.org>
	<pan.2011.09.29.00.10.37.975000@nowhere.com>
Message-ID: <op.v2jrcnfxx6zn5v@lepton>

En Wed, 28 Sep 2011 21:10:38 -0300, Nobody <nobody at nowhere.com> escribi?:

> On Wed, 28 Sep 2011 15:21:25 -0700, Ned Deily wrote:
>
>> No, it was a deliberate decision.  After a release is in security-fix
>> mode only, we don't build Windows or Mac OS X installers for them.
>
> But you continue to offer the installers for the unfixed version.

As well as all the previous ones back to Python 1.x

I can think of several alternatives:

* Upgrade to Python 2.7, the current stable and maintained release.

* Compile Python 2.6.7 yourself. For the 32 bits version, you may use  
Microsoft Visual C++ 2008 Express Edition (free/gratis); see  
PCbuild\readme.txt for details. Obtain the required dependencies using  
Tools\buildbot\external.bat. It compiles cleanly out of the box.

* Obtain the compiled binary somewhere else. Considering that 2.6.7 is  
just a security patch, I'm not sure if running a precompiled binary from  
untrusted sources is any better than sticking with the official, previous  
version. I've built the binaries, in case you're interested.

* Compare both source trees and look at their differences. Most of them  
are in Python modules that you can just drop over an existing 2.6.6  
install. Only two C modules have changed, and require rebuilding  
python26.dll:

  timemodule.c r87648: Issue #8013: Fixed time.asctime segfault when OS's  
asctime fails
  unicodedata.c http://bugs.python.org/issue10254

If you think you're not affected by these, just ignore 2.6.7 (or apply  
only the .py changes)

-- 
Gabriel Genellina



From rantingrick at gmail.com  Wed Sep 28 21:59:49 2011
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 28 Sep 2011 18:59:49 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <42df7e77-44ab-405e-9c60-8f394e3e5628@d17g2000yqa.googlegroups.com>

On Sep 27, 11:25?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:

> The Python development team is relatively small and chronically busy: too
> much to do and not enough time to do it.

If that is the case then why do they snub their noses at anyone who
wishes to help? What kind of people would chase off good help just to
save ego? I imagine the folks at py dev sort of like a dying man in
need of a heart transplant; the man informs the doctor that he would
happy to get a transplant but not if the heart came from a jew, asian,
african, latin, russian, or canuck.


From ericsnowcurrently at gmail.com  Wed Sep 28 22:01:14 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Wed, 28 Sep 2011 20:01:14 -0600
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <CABicbJLMV+Wez60xPzKyrFE1nrLw+H=iHZ5QxjEXp-1wngpHbQ@mail.gmail.com>
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJLMV+Wez60xPzKyrFE1nrLw+H=iHZ5QxjEXp-1wngpHbQ@mail.gmail.com>
Message-ID: <CALFfu7AvqCLRinj=RvWrUixkJgiDCh0wZDbtysw_cdRw9tecUg@mail.gmail.com>

On Wed, Sep 28, 2011 at 6:50 PM, Devin Jeanpierre
<jeanpierreda at gmail.com> wrote:
>> I used to ask the same question, but then I decided that if I wanted each
>> data point to get its own tick, I should bite the bullet and write an
>> individual test for each.
>
> Nearly the entire re module test suite is a list of tuples. If it was
> instead a bunch of TestCase classes, there'd be a lot more boilerplate
> to write. (At a bare minimum, there'd be two times as many lines, and
> all the extra lines would be identical...)
>
> Why is writing boilerplate for a new test a good thing? It discourages
> the authorship of tests. Make it as easy as possible by e.g. adding a
> new thing to whatever you're iterating over. This is, for example, why
> the nose test library has a decorator for generating a test suite from
> a generator.

+1

>
> Devin
>
> On Wed, Sep 28, 2011 at 8:16 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> Tim Chase wrote:
>>
>>> While I asked this on the Django list as it happened to be with
>>> some Django testing code, this might be a more generic Python
>>> question so I'll ask here too.
>>>
>>> When performing unittest tests, I have a number of methods of the
>>> form
>>>
>>> ? ?def test_foo(self):
>>> ? ? ?data = (
>>> ? ? ? ?(item1, result1),
>>> ? ? ? ?... #bunch of tests for fence-post errors
>>> ? ? ? ?)
>>> ? ? ?for test, result in data:
>>> ? ? ? ?self.assertEqual(process(test), result)
>>>
>>> When I run my tests, I only get a tick for running one the one
>>> test (test_foo), not the len(data) tests that were actually
>>> performed. ?Is there a way for unittesting to report the number
>>> of passed-assertions rather than the number of test-methods run?
>>
>> I used to ask the same question, but then I decided that if I wanted each
>> data point to get its own tick, I should bite the bullet and write an
>> individual test for each.
>>
>> If you really care, you could subclass unittest.TestCase, and then cause
>> each assert* method to count how often it gets called. But really, how much
>> detailed info about *passed* tests do you need?
>>
>> If you are writing loops inside tests, you might find this anecdote useful:
>>
>> http://mail.python.org/pipermail/python-list/2011-April/1270640.html
>>
>>
>>
>> --
>> Steven
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rantingrick at gmail.com  Wed Sep 28 22:11:08 2011
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 28 Sep 2011 19:11:08 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
Message-ID: <dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>

On Sep 28, 6:26?pm, Tim Johnson <t... at akwebsoft.com> wrote:
> * DevPlayer <devpla... at gmail.com> [110928 04:31]:
> > On Sep 27, 10:25 pm, alex23 <wuwe... at gmail.com> wrote:
> > > rantingrick <rantingr... at gmail.com> wrote:
> > > > Since, like the bible
> > > > the zen is self contradicting, any argument utilizing the zen can be
> > > > defeated utilizing the zen.
>
> > > And like the Bible, the Zen was created by humans as a joke. If you're
> > > taking it too seriously, that's your problem.
>
> > > > If however you want to learn about the accepted rules for formatting
> > > > code then you need to read "PEP-8"! PEP 8 is our style guide.
>
> > Contradiction is only seen by narrow perspectve.
>
> > Calling the Bible a joke is used to hurt people, not enlighten them.
> > Those words show bitter arrogance, not constructive critism as it
> > ignores how others feel about that book. What benefit to others is
> > gained by calling someones belief a joke?
>
> ?My wife and I are devout christians, but not fundamentalist. We
> ?would not take rantingrick too seriously. If _you_ take him
> ?seriously, you're just giving him 'street cred'.

DevPlayer was not even talking about what i said, he was replying to a
statement by Alex23 who said (and i quote) "And like the Bible, the
Zen was created by humans as a joke". Maybe you should spend the next
fifteen or so minutes catching up to the conversation...(?_?)...of
course only *after* you clean that egg from your face.


From devplayer at gmail.com  Wed Sep 28 22:15:24 2011
From: devplayer at gmail.com (DevPlayer)
Date: Wed, 28 Sep 2011 19:15:24 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
Message-ID: <088ba6ac-4468-4755-9336-f1ddf1ab2121@k15g2000yqd.googlegroups.com>

Oh I was just testing my intellecual-enlightenment-from-ranter-
conversation algorithm found in a previous post. I think my OOP model
failed as I'm just too tired to finished that pattern test. He had
some good points which fit the process I layed out. But the original
topic is just so much better:

Suggested coding style Options





From ben+python at benfinney.id.au  Wed Sep 28 22:25:41 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 12:25:41 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <878vp83x0a.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I used to ask the same question, but then I decided that if I wanted
> each data point to get its own tick, I should bite the bullet and
> write an individual test for each.

Hence my advocating the ?testscenarios? library. Have you tried that?

It allows the best of both worlds: within the class, you write a
collection of data scenarios, and write one test case for each separate
behaviour, and that's all that appears in the code; but the test run
shows every test case for every scenario.

E.g. with a ParrotTestCase class having three test cases and four
scenarios, the test run will run the full combination of all of them and
report twelve distinct test cases and the result for each.

So the ?bite the bullet? you describe isn't necessary to get what you
want.

> If you really care, you could subclass unittest.TestCase, and then
> cause each assert* method to count how often it gets called. But
> really, how much detailed info about *passed* tests do you need?

The ?testscenarios? library does subclass the standard library
?unittest? module.

But as explained elsewhere, it's not the counting which is the issue.
The issue is to ensure (and report) that every test case is actually
tested in isolation against every relevant scenario.

-- 
 \            ?Human reason is snatching everything to itself, leaving |
  `\              nothing for faith.? ?Bernard of Clairvaux, 1090?1153 |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Wed Sep 28 22:27:27 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 12:27:27 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
Message-ID: <874nzw3wxc.fsf@benfinney.id.au>

Roy Smith <roy at panix.com> writes:

> In article <87k48szqo1.fsf at benfinney.id.au>,
>  Ben Finney <ben+python at benfinney.id.au> wrote:
>
> > Worse, if one of the scenarios causes the test to fail, the loop will
> > end and you won't get the results for the remaining scenarios.
>
> Which, depending on what you're doing, may or may not be important.  In 
> many cases, there's only two states of interest:
>
> 1) All tests pass
>
> 2) Anything else

For the purpose of debugging, it's always useful to more specifically
narrow down the factors leading to failure.

-- 
 \      ?A lie can be told in a few words. Debunking that lie can take |
  `\   pages. That is why my book? is five hundred pages long.? ?Chris |
_o__)                                                Rodda, 2011-05-05 |
Ben Finney


From wuwei23 at gmail.com  Wed Sep 28 22:41:51 2011
From: wuwei23 at gmail.com (alex23)
Date: Wed, 28 Sep 2011 19:41:51 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <22c6d97a-a0f3-43e8-ac23-16787db5da1d@g33g2000yqc.googlegroups.com>

On Sep 28, 10:12?pm, DevPlayer <devpla... at gmail.com> wrote:
> Calling the Bible a joke is used to hurt people, not enlighten them.

Y'know, I wouldn't even bother responding to this if Xianists were as
open, forgiving and accepting as their messiah told them to be. It was
a *flippant remark*. If you want to establish intent, aggression and
religio-politico-philosophy from every throwaway remark made on the
internet, you're not really going to have much time for Python.

My belief system isn't your's. Hell, my belief system doesn't even
require that I have *any respect whatsoever* for your's. If it's okay
for Xianists to "suffer not a witch to live", then I'm going to assert
my making light jokes about those whose world view is in direct
opposition to mine isn't even comparable to that mentality.

from attitude import humour

(Since we're already fully derailed here, I've always preferred
Borges' suggestion that it was actually Judas who carried the full
weight of man's sins, given that his betrayal of Christ and inevitable
condemnation to hell was a necessity. Then again, I'm able to safely
view this as *allegory* and am genuinely interested in the opinions of
modern minds over something first begun by nomads millenia ago...)




From roy at panix.com  Wed Sep 28 22:49:58 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 22:49:58 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
	<874nzw3wxc.fsf@benfinney.id.au>
Message-ID: <roy-C4E4C5.22495828092011@news.panix.com>

In article <874nzw3wxc.fsf at benfinney.id.au>,
 Ben Finney <ben+python at benfinney.id.au> wrote:

> Roy Smith <roy at panix.com> writes:
> 
> > In article <87k48szqo1.fsf at benfinney.id.au>,
> >  Ben Finney <ben+python at benfinney.id.au> wrote:
> >
> > > Worse, if one of the scenarios causes the test to fail, the loop will
> > > end and you won't get the results for the remaining scenarios.
> >
> > Which, depending on what you're doing, may or may not be important.  In 
> > many cases, there's only two states of interest:
> >
> > 1) All tests pass
> >
> > 2) Anything else
> 
> For the purpose of debugging, it's always useful to more specifically
> narrow down the factors leading to failure.

Well, sure, but "need to debug" is just a consequence of being in state 
2.  If a test fails and I can't figure out why, I can always go back and 
add additional code to the test case to extract additional information.


From ben+python at benfinney.id.au  Wed Sep 28 23:05:36 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 13:05:36 +1000
Subject: [OT] Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
Message-ID: <87zkho2glb.fsf@benfinney.id.au>

Devin Jeanpierre <jeanpierreda at gmail.com> writes:

> > Forget money, or even the love of money. The idea that one mustn't
> > criticise another person's beliefs is the root of all evil.
>
> This was a technical discussion, and calling the bible a joke was not
> necessary at all. It creates a hostile atmosphere.

I disagree. It was not an attack on any person nor group of people. If
we are to be required to avoid jokes not directed at people, then *that*
is an atmosphere hostile to open friendly discussion.

> Can't you pick somewhere else to attack Christianity?

The person who wrote the ?bible is a joke? intended it as a flippant
remark. Countless other flippant remarks pass through here all the time,
making jokes at the expense of some idea or other. Christianity will not
be an exception to that.

If you find someone attacking people, I'll join you in ostracising the
attacker. But no, don't attempt to silence jokes that attack an idea.

Off-topic? If we start discussing the content of the ideas being
attacked, yeah, I'd say religion is pretty off-topic.

But the topic of keeping this forum safe for technical discussion
entails that it must be safe for *any* idea to be the butt of a joke, be
it a religious text or the Zen of Python, and that is very much
on-topic.

-- 
 \         ?We demand rigidly defined areas of doubt and uncertainty!? |
  `\    ?Vroomfondel, _The Hitch-Hiker's Guide To The Galaxy_, Douglas |
_o__)                                                            Adams |
Ben Finney


From python.list at tim.thechases.com  Wed Sep 28 23:13:57 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 28 Sep 2011 22:13:57 -0500
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <roy-0A695E.20523128092011@news.panix.com>
References: <mailman.1528.1317219432.27778.python-list@python.org>	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
Message-ID: <4E83E275.6060209@tim.thechases.com>

On 09/28/11 19:52, Roy Smith wrote:
> In many cases, there's only two states of interest:
>
> 1) All tests pass
>
> 2) Anything else

Whether for better or worse, at some places (such as a previous 
employer) the number (and accretion) of test-points is a 
marketing bullet-point for upgrades & new releases.

-tkc





From roy at panix.com  Wed Sep 28 23:20:27 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 23:20:27 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
	<mailman.1552.1317266045.27778.python-list@python.org>
Message-ID: <roy-A524D5.23202628092011@news.panix.com>

In article <mailman.1552.1317266045.27778.python-list at python.org>,
 Tim Chase <python.list at tim.thechases.com> wrote:

> On 09/28/11 19:52, Roy Smith wrote:
> > In many cases, there's only two states of interest:
> >
> > 1) All tests pass
> >
> > 2) Anything else
> 
> Whether for better or worse, at some places (such as a previous 
> employer) the number (and accretion) of test-points is a 
> marketing bullet-point for upgrades & new releases.

Never attribute to malice that which is adequately explained by the 
stupidity of the marketing department.


From rosuav at gmail.com  Thu Sep 29 00:27:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 29 Sep 2011 14:27:31 +1000
Subject: A Trivial Question
In-Reply-To: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
References: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
Message-ID: <CAPTjJmprBHpZWm6eDoASmymNVoe=38U8k2VqFGYcKbcf2Y0nkQ@mail.gmail.com>

On Thu, Sep 29, 2011 at 7:53 AM, Tayfun Kayhan
<tayfun92_kayhan at yahoo.com> wrote:
> def trial():
>    class Foo(object):
>       def __init__(self):
>          print("Hello, world!")
> trial() # not worked, as expected.

Python doesn't have "class declarations" in the way that some other
languages do. The 'class' statement is an executable statement - it
builds a class object and binds it to the name Foo, just like any
other assignment. The 'def' command builds a function object in a
similar fashion. So in your trial() function, you're defining a class
and binding it to the local name Foo; and then doing nothing with it.
It's perfectly legal, and as Chris Rebert suggests, you can make it
useful by instantiating Foo() objects inside trial().

ChrisA


From gaurav.gangalwar at gmail.com  Thu Sep 29 01:17:46 2011
From: gaurav.gangalwar at gmail.com (gaurav gangalwar)
Date: Thu, 29 Sep 2011 10:47:46 +0530
Subject: UnicodeDecodeError
Message-ID: <CAJiE4OkRseJAvRBxzt2tOzsp7A75ONd2fbpnCyVCrNwyOjebgQ@mail.gmail.com>

I am getting this error while some testing on Python2.6,

 File "/usr/lib64/python2.6/httplib.py", line 774, in _send_output     #msg
= "\r\n".join(self._buffer) UnicodeDecodeError: 'ascii' codec can't decode
byte 0xe1 in position 14: ordinal not in range(128)

I tried the change suggested on this link
http://web.archiveorange.com/archive/v/PJbOg9pxJoUpQA9AHp3X, its working
fine after that.

There seems to be some problem in httplib with unicode handling.
I am running it on centos5.
I am still not sure why its happening and what will be ideal solution for
this?

Thanks,
Gaurav
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From namenobodywants at gmail.com  Thu Sep 29 01:47:49 2011
From: namenobodywants at gmail.com (Sean McIlroy)
Date: Wed, 28 Sep 2011 22:47:49 -0700 (PDT)
Subject: change text of a Tkinter Button by clicking it
Message-ID: <b32d1d2b-0692-4050-9275-428dae2e2a25@5g2000yqo.googlegroups.com>

hello

(how) can you change the text of a Tkinter Button by clicking it?
something like

def click(index): return lambda: buttons[index].text = 'hello'
buttons = [Button(root,command=click(index)) for index in
range(numbuttons)]

only with an attribute that Buttons actually have. sorry to have to
ask such a see-spot-run question. thanks if you can help.

peace
stm


From namenobodywants at gmail.com  Thu Sep 29 02:15:20 2011
From: namenobodywants at gmail.com (Sean McIlroy)
Date: Wed, 28 Sep 2011 23:15:20 -0700 (PDT)
Subject: change text of a Tkinter Button by clicking it
References: <b32d1d2b-0692-4050-9275-428dae2e2a25@5g2000yqo.googlegroups.com>
Message-ID: <fd4eb890-b9ed-492a-b38f-9df8ac3ff2be@gd10g2000vbb.googlegroups.com>

never mind. i found it.


From questions.anon at gmail.com  Thu Sep 29 02:16:13 2011
From: questions.anon at gmail.com (questions anon)
Date: Thu, 29 Sep 2011 16:16:13 +1000
Subject: memory error
In-Reply-To: <CAN_=ogtoNm2Y2ubP9ou7h+fkQJXBQdNF26hJW79jH28tqdUrCg@mail.gmail.com>
References: <CAN_=ogtoNm2Y2ubP9ou7h+fkQJXBQdNF26hJW79jH28tqdUrCg@mail.gmail.com>
Message-ID: <CAN_=ogtfVgmZB=Ydspt1u_j0GHvQQ2sGyetnD7xTAEoGwTLcqg@mail.gmail.com>

Hello All,
I am still having trouble with memory errors when I try to process many
netcdf files.
Originally I would get the memory error as mentioned in the previous post
but when I added gc.collect() after each for loop I receive the error:
GEOS_ERROR: bad allocation
with no additional information!
The error use to occur at the point when a new netcdf file was to be opened
and plotted but with the things I have 'fixed' thanks to suggestions from
this list it seems to happen while processing the second file.
I am just trying to plot 3hourly data for each file and each file contains
hourly data for a month and I am trying to do this for many months.
It seems like I cannot close down the last file properly so the computer has
a clean memory to start the next one.
Any feedback will be greatly appreciated.
My latest version of the code:

######################

from netCDF4 import Dataset
import numpy as N
import matplotlib.pyplot as plt
from numpy import ma as MA
from mpl_toolkits.basemap import Basemap
from netcdftime import utime
from datetime import datetime
import os


shapefile1="E:/DSE_BushfireClimatologyProject/griddeddatasamples/test_GIS/DSE_REGIONS"
OutputFolder=r"E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/OutputsforValidation"

def plotrawdata(variable):
        if variable=='TSFC':
                ncvariablename='T_SFC'

MainFolder=r"E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/InputsforValidation/T_SFC/"
                ticks=[-5,0,5,10,15,20,25,30,35,40,45,50]
                Title='Surface Temperature'
                cmap=plt.cm.jet

        elif variable=='RHSFC':
                ncvariablename='RH_SFC'

MainFolder=r"E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/InputsforValidation/RH_SFC/"
                ticks=[0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
                Title='Surface RH'
                cmap=plt.cm.jet_r


fileforlatlon=Dataset("E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/InputsforValidation/T_SFC/TSFC_1974_01/IDZ00026_VIC_ADFD_T_SFC.nc",
'r+', 'NETCDF4')
        LAT=fileforlatlon.variables['latitude'][:]
        LON=fileforlatlon.variables['longitude'][:]

        startperiod=raw_input("Start slice (e.g. 1 ): ")
        endperiod=raw_input("End slice (e.g. 2): ")
        skipperiod=raw_input("skip slice (e.g. 1): ")
        if startperiod == "":
                startperiod = None
        else:
                startperiod = int(startperiod)
        if endperiod == "":
                endperiod = None
        else:
                endperiod = int(endperiod)
        if skipperiod == "":
                skipperiod = None
        else:
                skipperiod= int(skipperiod)

        for (path, dirs, files) in os.walk(MainFolder):
                        for dir in dirs:
                                print dir
                        path=path+'/'

                        for ncfile in files:
                                if ncfile[-3:]=='.nc':
                                    print "dealing with ncfiles:",
path+ncfile
                                    ncfile=os.path.join(path,ncfile)
                                    ncfile=Dataset(ncfile, 'r+', 'NETCDF4')
                                    #global TSFC

variable=ncfile.variables[ncvariablename][startperiod:endperiod:skipperiod]

TIME=ncfile.variables['time'][startperiod:endperiod:skipperiod]

fillvalue=ncfile.variables[ncvariablename]._FillValue
                                    ncfile.close()

                                    for variable, TIME in
zip((variable[:]),(TIME[:])):
                                    #for variable, TIME in
zip((variable[sliceperiod]),(TIME[sliceperiod])):

                                            cdftime=utime('seconds since
1970-01-01 00:00:00')

ncfiletime=cdftime.num2date(TIME)
                                            print ncfiletime
                                            timestr=str(ncfiletime)
                                            d = datetime.strptime(timestr,
'%Y-%m-%d %H:%M:%S')
                                            date_string =
d.strftime('%Y%m%d_%H%M')
                                            #Set up basemap using mercator
projection
http://matplotlib.sourceforge.net/basemap/doc/html/users/merc.html
                                            map =
Basemap(projection='merc',llcrnrlat=-40,urcrnrlat=-33,

llcrnrlon=139.0,urcrnrlon=151.0,lat_ts=0,resolution='i')
                                            x,y=map(*N.meshgrid(LON,LAT))

map.drawcoastlines(linewidth=0.5)
                                            map.readshapefile(shapefile1,
'DSE_REGIONS')
                                            map.drawstates()

                                            plt.title(Title+' %s
UTC'%ncfiletime)

                                            CS = map.contourf(x,y,variable,
ticks, cmap=cmap)
                                            l,b,w,h =0.1,0.1,0.8,0.8
                                            cax = plt.axes([l+w+0.025, b,
0.025, h], )
                                            cbar=plt.colorbar(CS, cax=cax,
drawedges=True)

                                            #save map as *.png and plot
netcdf file

plt.savefig((os.path.join(OutputFolder,
ncvariablename+date_string+'UTC.png')))
                                            #plt.show()
                                            plt.close()


######################



On Wed, Sep 14, 2011 at 4:08 PM, questions anon <questions.anon at gmail.com>wrote:

> Hello All,
> I keep coming across a memory error when processing many netcdf files. I
> assume it has something to do with how I loop things and maybe need to close
> things off properly.
> In the code below I am looping through a bunch of netcdf files (each file
> is hourly data for one month) and within each netcdf file I am outputting a
> *png file every three hours.
> This works for one netcdf file but when it begins to process the next
> netcdf file I receive this memory error:
>
> *Traceback (most recent call last):
>   File
> "d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
> line 44, in <module>
>     TSFC=ncfile.variables['T_SFC'][:]
>   File "netCDF4.pyx", line 2473, in netCDF4.Variable.__getitem__
> (netCDF4.c:23094)
> MemoryError*
>
> To reduce processing requirements I have tried making the LAT and LON to
> only use [0] but I also receive an error:
>
> *Traceback (most recent call last):
>   File
> "d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
> line 75, in <module>
>     x,y=map(*N.meshgrid(LON,LAT))
>   File "C:\Python27\lib\site-packages\numpy\lib\function_base.py", line
> 3256, in meshgrid
>     numRows, numCols = len(y), len(x)  # yes, reversed
> TypeError: len() of unsized object*
>
> finally I have added gc.collect() in a couple of places but that doesn't
> seem to do anything to help.
> I am using :*Python 2.7.2 |EPD 7.1-2 (32-bit)| (default, Jul  3 2011,
> 15:13:59) [MSC v.1500 32 bit (Intel)] on win32*
> Any feedback will be greatly appreciated!
>
>
> from netCDF4 import Dataset
> import numpy
> import numpy as N
> import matplotlib.pyplot as plt
> from numpy import ma as MA
> from mpl_toolkits.basemap import Basemap
> from netcdftime import utime
> from datetime import datetime
> import os
> import gc
>
> print "start processing...."
>
> inputpath=r'E:/GriddedData/Input/'
> outputpath=r'E:/GriddedData/Validation/'
> shapefile1="E:/test_GIS/DSE_REGIONS"
> for (path, dirs, files) in os.walk(inputpath):
>     for dir in dirs:
>         print dir
>         sourcepath=os.path.join(path,dir)
>         relativepath=os.path.relpath(sourcepath,inputpath)
>         newdir=os.path.join(outputpath,relativepath)
>         if not os.path.exists(newdir):
>             os.makedirs(newdir)
>
>     for ncfile in files:
>         if ncfile[-3:]=='.nc':
>             print "dealing with ncfiles:", ncfile
>             ncfile=os.path.join(sourcepath,ncfile)
>             #print ncfile
>             ncfile=Dataset(ncfile, 'r+', 'NETCDF4')
>             TSFC=ncfile.variables['T_SFC'][:,:,:]
>             TIME=ncfile.variables['time'][:]
>             LAT=ncfile.variables['latitude'][:]
>             LON=ncfile.variables['longitude'][:]
>             fillvalue=ncfile.variables['T_SFC']._FillValue
>             TSFC=MA.masked_values(TSFC, fillvalue)
>             ncfile.close()
>             gc.collect()
>             print "garbage collected"
>
>
>             for TSFC, TIME in zip((TSFC[1::3]),(TIME[1::3])):
>                 print TSFC, TIME
>             #convert time from numbers to date and prepare it to have no
> symbols for saving to filename
>                 cdftime=utime('seconds since 1970-01-01 00:00:00')
>                 ncfiletime=cdftime.num2date(TIME)
>                 print ncfiletime
>                 timestr=str(ncfiletime)
>                 d = datetime.strptime(timestr, '%Y-%m-%d %H:%M:%S')
>                 date_string = d.strftime('%Y%m%d_%H%M')
>
>                 #Set up basemap using mercator projection
> http://matplotlib.sourceforge.net/basemap/doc/html/users/merc.html
>                 map =
> Basemap(projection='merc',llcrnrlat=-40,urcrnrlat=-33,
>
> llcrnrlon=139.0,urcrnrlon=151.0,lat_ts=0,resolution='i')
>
>             # compute map projection coordinates for lat/lon grid.
>                 x,y=map(*N.meshgrid(LON,LAT))
>                 map.drawcoastlines(linewidth=0.5)
>                 map.readshapefile(shapefile1, 'DSE_REGIONS')
>                 map.drawstates()
>
>                 plt.title('Surface temperature at %s UTC'%ncfiletime)
>                 ticks=[-5,0,5,10,15,20,25,30,35,40,45,50]
>                 CS = map.contourf(x,y,TSFC, ticks, cmap=plt.cm.jet)
>                 l,b,w,h =0.1,0.1,0.8,0.8
>                 cax = plt.axes([l+w+0.025, b, 0.025, h], )
>                 cbar=plt.colorbar(CS, cax=cax, drawedges=True)
>
>             #save map as *.png and plot netcdf file
>
> plt.savefig((os.path.join(newdir,'TSFC'+date_string+'UTC.png')))
>                 plt.close()
>                 gc.collect()
>                 print "garbage collected again"
> print "end of processing"
>
>
>
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From anikom15 at gmail.com  Thu Sep 29 02:21:21 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 28 Sep 2011 23:21:21 -0700
Subject: syntactic sugar for def?
In-Reply-To: <j608vt$hcs$1@dough.gmane.org>
References: <4E8390F1.9060207@stoneleaf.us>
 <j608vt$hcs$1@dough.gmane.org>
Message-ID: <20110929062121.GA10216@Smoke>

On Wed, Sep 28, 2011 at 07:01:11PM -0400, Terry Reedy wrote:
> On 9/28/2011 5:26 PM, Ethan Furman wrote:
> 
> >I don't remember if 'def' is sugar for something besides lambda.
> 
> That is a bit backwards.
>   lambda x: expr(x)
> is syntactic sugar for
>   def <lambda>(x): return expr(x)
>   del <lambda>
> ;-)
> 

lambda is less sugar and more of just a def as an expression.


From anikom15 at gmail.com  Thu Sep 29 02:24:13 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 28 Sep 2011 23:24:13 -0700
Subject: Suggested coding style
In-Reply-To: <dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
Message-ID: <20110929062413.GB10216@Smoke>

On Wed, Sep 28, 2011 at 07:11:08PM -0700, rantingrick wrote:
> On Sep 28, 6:26?pm, Tim Johnson <t... at akwebsoft.com> wrote:
> > * DevPlayer <devpla... at gmail.com> [110928 04:31]:
> > > On Sep 27, 10:25 pm, alex23 <wuwe... at gmail.com> wrote:
> > > > rantingrick <rantingr... at gmail.com> wrote:
> > > > > Since, like the bible
> > > > > the zen is self contradicting, any argument utilizing the zen can be
> > > > > defeated utilizing the zen.
> >
> > > > And like the Bible, the Zen was created by humans as a joke. If you're
> > > > taking it too seriously, that's your problem.
> >
> > > > > If however you want to learn about the accepted rules for formatting
> > > > > code then you need to read "PEP-8"! PEP 8 is our style guide.
> >
> > > Contradiction is only seen by narrow perspectve.
> >
> > > Calling the Bible a joke is used to hurt people, not enlighten them.
> > > Those words show bitter arrogance, not constructive critism as it
> > > ignores how others feel about that book. What benefit to others is
> > > gained by calling someones belief a joke?
> >
> > ?My wife and I are devout christians, but not fundamentalist. We
> > ?would not take rantingrick too seriously. If _you_ take him
> > ?seriously, you're just giving him 'street cred'.
> 
> DevPlayer was not even talking about what i said, he was replying to a
> statement by Alex23 who said (and i quote) "And like the Bible, the
> Zen was created by humans as a joke". Maybe you should spend the next
> fifteen or so minutes catching up to the conversation...(?_?)...of
> course only *after* you clean that egg from your face

Perhaps you should spend a little less time on the mailing list and a
little more time in church.


From __peter__ at web.de  Thu Sep 29 02:27:00 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 29 Sep 2011 08:27 +0200
Subject: change text of a Tkinter Button by clicking it
References: <b32d1d2b-0692-4050-9275-428dae2e2a25@5g2000yqo.googlegroups.com>
Message-ID: <j6132o$sqb$1@dough.gmane.org>

Sean McIlroy wrote:

> hello
> 
> (how) can you change the text of a Tkinter Button by clicking it?
> something like
> 
> def click(index): return lambda: buttons[index].text = 'hello'
> buttons = [Button(root,command=click(index)) for index in
> range(numbuttons)]
> 
> only with an attribute that Buttons actually have. sorry to have to
> ask such a see-spot-run question. thanks if you can help.

See http://infohost.nmt.edu/tcc/help/pubs/tkinter/universal.html

You can set the text of a Button widget with

button["text"] = ...

or

button.configure(text=...)





From ian.g.kelly at gmail.com  Thu Sep 29 02:57:21 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 00:57:21 -0600
Subject: Suggested coding style
In-Reply-To: <20110929062413.GB10216@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<20110929062413.GB10216@Smoke>
Message-ID: <CALwzidkVOVj=HS7mr=OTt1xhDUSNbeR=EnBSN0dwUw074DpO5g@mail.gmail.com>

On Thu, Sep 29, 2011 at 12:24 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> Perhaps you should spend a little less time on the mailing list and a
> little more time in church.

You must not like churchgoers very much if you want to inflict
rantingrick on them...


From ian.g.kelly at gmail.com  Thu Sep 29 03:08:13 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 01:08:13 -0600
Subject: Suggested coding style
In-Reply-To: <CALwzidkVOVj=HS7mr=OTt1xhDUSNbeR=EnBSN0dwUw074DpO5g@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<20110929062413.GB10216@Smoke>
	<CALwzidkVOVj=HS7mr=OTt1xhDUSNbeR=EnBSN0dwUw074DpO5g@mail.gmail.com>
Message-ID: <CALwzidkw2KKxgwavdGRkRahw00536nNYOFqHTFn7SavkWpwHgw@mail.gmail.com>

On Thu, Sep 29, 2011 at 12:57 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Thu, Sep 29, 2011 at 12:24 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
>> Perhaps you should spend a little less time on the mailing list and a
>> little more time in church.
>
> You must not like churchgoers very much if you want to inflict
> rantingrick on them...

Although come to think of it, I bet he could deliver a pretty mean sermon. ;-)


From jitu.icfai at gmail.com  Thu Sep 29 03:41:29 2011
From: jitu.icfai at gmail.com (jitendra gupta)
Date: Thu, 29 Sep 2011 13:11:29 +0530
Subject: A trivial question
In-Reply-To: <1317246561.85326.YahooMailNeo@web120310.mail.ne1.yahoo.com>
References: <1317246561.85326.YahooMailNeo@web120310.mail.ne1.yahoo.com>
Message-ID: <CAM6SjUJNKRRUw078JMek-gQA6oZyEVZo12XrFmwyENQoSpqraw@mail.gmail.com>

HI
The class Foo you have defined is local NameSpace for trial functioon, for
details http://docs.python.org/tutorial/classes.html

def trial():
class Foo(object):
def __init__(self):
print("Hello, world!")
       lacalClass = Foo()
>>>trial
"Hello, world!"

Thanks
Jitendra

On Thu, Sep 29, 2011 at 3:19 AM, Tayfun Kayhan <tayfun92_kayhan at yahoo.com>wrote:

> I accidentally wrote such a code (below) while trying to write sth else for
> my application but i am now just wondering much how to run the class Foo, if
> it is possible. Is not it weird that Python does not give any error when I
> run it ? Sorry for that it's pretty unimportant question according to the
> other questions being asked here :D
>
> def trial():
> class Foo(object):
> def __init__(self):
> print("Hello, world!")
> trial() # not worked, as expected.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
-------------- next part --------------
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From steve+comp.lang.python at pearwood.info  Thu Sep 29 05:21:16 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 29 Sep 2011 09:21:16 GMT
Subject: Python without a tty
Message-ID: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>

I have a Python script which I would like to test without a tty attached 
to the process. I could run it as a cron job, but is there an easier way?

I am running Linux.



-- 
Steven


From redbullhats123 at gmail.com  Thu Sep 29 05:36:29 2011
From: redbullhats123 at gmail.com (red bull hats red bull hats)
Date: Thu, 29 Sep 2011 02:36:29 -0700 (PDT)
Subject: red bull hats, monster energy hats, red bull t shirts, monster energy
	t shirts, snapback hats on www.theworldhats.com
Message-ID: <e694068b-8a03-4419-86f9-d538fb2b0041@i33g2000yqm.googlegroups.com>

 www.theworldhats.com are promoting

the products:

red bull hats:http://www.theworldhats.com/category-130-b0-Red-Bull-
Hats.html

snapback hats: http://www.theworldhats.com/category-230-b0-Snapback-Hats.html

monster energy hats: http://www.theworldhats.com/category-128-b0-Monster-Energy-Hats.html

red bull t shirts:http://www.theworldhats.com/category-227-b0-Red-Bull-
T-shirts.html

monster energy t shirts:http://www.theworldhats.com/category-203-b0-
Monster-Energy-T-shirts.html

website: www.theworldhats.com


From t at jollybox.de  Thu Sep 29 05:45:40 2011
From: t at jollybox.de (Thomas Jollans)
Date: Thu, 29 Sep 2011 11:45:40 +0200
Subject: Python without a tty
In-Reply-To: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E843E44.7040008@jollybox.de>

On 29/09/11 11:21, Steven D'Aprano wrote:
> I have a Python script which I would like to test without a tty attached 
> to the process. I could run it as a cron job, but is there an easier way?
> 
> I am running Linux.
> 

./program </dev/null >/dev/null 2>&1



From alain at dpt-info.u-strasbg.fr  Thu Sep 29 05:53:12 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Thu, 29 Sep 2011 11:53:12 +0200
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87bou3wu7r.fsf@dpt-info.u-strasbg.fr>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I have a Python script which I would like to test without a tty attached 
> to the process. I could run it as a cron job, but is there an easier way?
>
> I am running Linux.

Isn't os.setsid() what you're looking for? It makes the calling process
have no controlling terminal. There's also a user command called setsid
that should have the same effect.

-- Alain.


From passiday at gmail.com  Thu Sep 29 06:37:39 2011
From: passiday at gmail.com (Passiday)
Date: Thu, 29 Sep 2011 03:37:39 -0700 (PDT)
Subject: Suggested coding style
In-Reply-To: <265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
Message-ID: <16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>

Oh, my. Who could expect this topic would iterate to some whining about religion (please don't respond on this remark of mine).

Here's a summary of what I take from this longwinded thread:
Read the Zen of Pthon for some fun: http://www.python.org/dev/peps/pep-0020
Read the PEP-8 for some good guidelines: http://www.python.org/dev/peps/pep-0008

My topic was "Suggested coding style" because I hoped there is some common understanding which of the ancient methods/functions are so not where they should be that the use of them should be depreciated. I can fully understand that when the language evolves, it might implement some ugly methods. Perhaps it was some quick itching need to format some numbers that drove some antique Python programmer so mad that he decided this belongs to the string class, instead of some number/date/string formatting class that attempts to build on existing well established standards. And so, the str.zfill() was born. But I'd expect that there exists some leadership who are brave enough to admit some bad decisions and lead the people by announcing that using certain methods is "bad style". No need to take them out of the implementation, that might unnecessary break some code in obscure places. However, guiding programmers for better coding practice and avoid ugly bloating of nice scripting language should be considered a holy (please don't rant on use of this word) mission.

Passiday


From steve+comp.lang.python at pearwood.info  Thu Sep 29 06:37:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 20:37:53 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<mailman.1558.1317277459.27778.python-list@python.org>
Message-ID: <4e844a83$0$29982$c3e8da3$5496439d@news.astraweb.com>

Westley Mart?nez wrote:

> Perhaps you should spend a little less time on the mailing list and a
> little more time in church.

Is that meant as punishment for Rick or for the churchgoers?


-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep 29 06:52:22 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 20:52:22 +1000
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
Message-ID: <4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>

Alain Ketterlin wrote:

> Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:
> 
>> I have a Python script which I would like to test without a tty attached
>> to the process. I could run it as a cron job, but is there an easier way?
>>
>> I am running Linux.
> 
> Isn't os.setsid() what you're looking for? It makes the calling process
> have no controlling terminal. There's also a user command called setsid
> that should have the same effect.

It doesn't appear so to me.

[steve at sylar ~]$ tty
/dev/pts/16
[steve at sylar ~]$ setsid tty
/dev/pts/16

[steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
True
[steve at sylar ~]$ setsid python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
True


If I run the same Python command (without the setsid) as a cron job, I 
get False emailed to me. That's the effect I'm looking for.



-- 
Steven



From hansmu at xs4all.nl  Thu Sep 29 07:39:25 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Thu, 29 Sep 2011 13:39:25 +0200
Subject: Python without a tty
In-Reply-To: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e8458ed$0$2486$e4fe514c@news2.news.xs4all.nl>

On 29/09/11 11:21:16, Steven D'Aprano wrote:
> I have a Python script which I would like to test without a tty attached
> to the process. I could run it as a cron job, but is there an easier way?

There is module on Pypi called python-daemon; it implements PEP-3143.
This module detaches the process from the tty and resets a number of
process attributes that are normally inherited.

You could start by reading the PEP to determine which of its features
are relevant to your situation.  It would provide you with a complete
list of aspects you'd need to think about.

If a third of what the module does is relevant to your situation and
the other two thirds do not hurt, then using the module is likely to
be less work than rolling your own.

Hope this helps,

-- HansM


From alain at dpt-info.u-strasbg.fr  Thu Sep 29 07:50:18 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Thu, 29 Sep 2011 13:50:18 +0200
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <877h4rwosl.fsf@dpt-info.u-strasbg.fr>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> Alain Ketterlin wrote:

>>> I have a Python script which I would like to test without a tty attached
>>> to the process. I could run it as a cron job, but is there an easier way?

>> Isn't os.setsid() what you're looking for?[...]

> It doesn't appear so to me.
[...]
> [steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
> [steve at sylar ~]$ setsid python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
>
> If I run the same Python command (without the setsid) as a cron job, I 
> get False emailed to me. That's the effect I'm looking for.

If that's what you mean by "without a tty attached", simply redirecting
standard channels should work, no?

-- Alain.


From hansmu at xs4all.nl  Thu Sep 29 07:50:29 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Thu, 29 Sep 2011 13:50:29 +0200
Subject: Python without a tty
In-Reply-To: <4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e845b85$0$2486$e4fe514c@news2.news.xs4all.nl>

On 29/09/11 12:52:22, Steven D'Aprano wrote:

> [steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
 >
> If I run the same Python command (without the setsid) as a cron job, I
> get False emailed to me. That's the effect I'm looking for.

In that case, all you need to do is redirect stdout:

$ python -c "import sys, os
 > print os.isatty(sys.stdout.fileno())" >/tmp/xxx
$ cat /tmp/xxx
False

You'll probably want to redirect to /dev/null and
maybe you want to redirect stdin and stderr as well.

-- HansM


From rantingrick at gmail.com  Thu Sep 29 08:23:30 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 05:23:30 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
Message-ID: <fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>

On Sep 29, 5:37?am, Passiday <passi... at gmail.com> wrote:

> Here's a summary of what I take from this longwinded thread:
> Read the Zen of Pthon for some fun:http://www.python.org/dev/peps/pep-0020
> Read the PEP-8 for some good guidelines:http://www.python.org/dev/peps/pep-0008

That's the point of all this, yes. You see, around here, once the
point is made there is an unwritten rule that the thread must then
descend into chaos. However, it seems you "may" have brought this
train wreck back to reality below... whether the trolls will allow
that happen remains to be seen...?

> My topic was "Suggested coding style" because I hoped
> there is some common understanding which of the ancient
> methods/functions are so not where they should be that the
> use of them should be depreciated.

I agree. Whilst zfill is useful, and probably should be a part of the
stlib somewhere, the string module is no place for it. The only way
zfill WOULD work as a string method is if it were changed to accept a
user defined fill char. Even then i don't like it as a string method;
too specific!

A specific method for padding a string with ONLY zeros is ludicrous
and exposes the narrow mindedness of the creator. The only thing worse
than "zfill" as a string method is making zfill into built-in
function! The ONLY proper place for zfill is as an option in the
str.format() method.

py> "{0:zf10}".format(1234) -> "00000000001234"

When are they going to see that I am the best API designer this
community has ever had the privilege to work with! GvR should be
texting me every night in hopes that some of my API genius will rub
off on him.

> I can fully understand
> that when the language evolves, it might implement some
> ugly methods. Perhaps it was some quick itching need to
> format some numbers that drove some antique Python
> programmer so mad that he decided this belongs to the
> string class, instead of some number/date/string
> formatting class that attempts to build on existing well
> established standards. And so, the str.zfill() was born.

zfills foster home placement is akin to the missing Path object we
still don't have. Both are a result of poor planning. Now zfill is
like some red headed step child that nobody wants, but nobody has the
balls to return the abortion to it's rightful place.

> But I'd expect that there exists some leadership who are
> brave enough to admit some bad decisions and lead the
> people by announcing that using certain methods is "bad
> style".

Ha! I would not hold my breath waiting for "leadership" to admit wrong
doings; these people think they are beyond reproach.

> No need to take them out of the implementation,
> that might unnecessary break some code in obscure places.

What is so bad about breaking code in obscure places? We changed print
to a function which broke just about every piece of code every written
in this language. (BTW, print should ALWAYS have been a function!)
What is so bad then about breaking some very obscure code? We could
always have a lengthy deprecation period.

> However, guiding programmers for better coding practice
> and avoid ugly bloating of nice scripting language should
> be considered a holy (please don't rant on use of this
> word) mission.

I agree. I think you'll agree also with me in the fact that Mr Van
Rossum has created the cleanest, most simplistically elegant, and no
nonsense language this world has ever seen. However. He is not immune
to the wicked influence of a few high ranking people within this
community who have "hidden agendas" and want to mutate Python into a
clone of some other nasty languages.

I believe GvR had a "mid-dev-crisis" and realized the err of his ways.
He attempted to turn back the clock with Python 3000, HOWEVER he did
not go far enough! Much more cleanup is in order to get this language
back on track to what it should be, and COULD be!


From ben+python at benfinney.id.au  Thu Sep 29 08:32:37 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 22:32:37 +1000
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87vcsb34wq.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I have a Python script which I would like to test without a tty
> attached to the process. I could run it as a cron job, but is there an
> easier way?
>
> I am running Linux.

You could crib from the ?python-daemon? library implementation
<URL:http://pypi.python.org/pypi/python-daemon>. Part of its job
involves detaching the current program from the terminal.

Or maybe you could simply invoke the library for its main purpose, if
that would be sufficient to do what you need.

-- 
 \        ?Sane people have an appropriate perspective on the relative |
  `\     importance of foodstuffs and human beings. Crazy people can't |
_o__)                 tell the difference.? ?Paul Z. Myers, 2010-04-18 |
Ben Finney


From rantingrick at gmail.com  Thu Sep 29 09:21:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 06:21:36 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <1c731ba2-7104-44bb-a5d4-5798ce56bfc8@z12g2000yqz.googlegroups.com>

On Sep 29, 7:23?am, rantingrick <rantingr... at gmail.com> wrote:

> A specific method for padding a string with ONLY zeros is ludicrous
> and exposes the narrow mindedness of the creator. The only thing worse
> than "zfill" as a string method is making zfill into built-in
> function! The ONLY proper place for zfill is as an option in the
> str.format() method.
>
> py> "{0:zf10}".format(1234) -> "00000000001234"


If something like "zfill" where to be included as a string method, it
should be more general like this:

class String:
    def pad(self, char, count, side='left') => str

py> "".pad(0, 10)
'00000000001234'

However the same can be accomplished with:

py> '{0}1234'.format("0"*10)
'00000000001234'

py> "0"*10+'1234'
'00000000001234'

Seems like pollution either way you go. Best to just let the
programmer handle it. Python IS NOT a 100% OOP language (and for good
reason!) so we don't need methods to scratch every little itch -- and
this itch seems to have originated in the "nether regions" instead of
the "Netherlands".




From roy at panix.com  Thu Sep 29 09:28:35 2011
From: roy at panix.com (Roy Smith)
Date: Thu, 29 Sep 2011 09:28:35 -0400
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-48F208.09283529092011@news.panix.com>

In article <4e84388c$0$29965$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> I have a Python script which I would like to test without a tty attached 
> to the process. I could run it as a cron job, but is there an easier way?

I'm not sure what you mean by "without a tty attached to the process".  
If you mean no file descriptors attached to your control terminal, then 
some variation on

foo.py < /dev/null > /dev/null

(as others has suggested) might be good enough.  Or, are you talking 
about control terminals in the process control sense?  In that case, you 
might want to look at the "at" or "batch" commands, which do very much 
the same thing as cron, but without the overhead of having to edit the 
cron file to get things going.


From python at mrabarnett.plus.com  Thu Sep 29 10:02:55 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 29 Sep 2011 15:02:55 +0100
Subject: [OT] Benefit and belief
In-Reply-To: <87zkho2glb.fsf@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
Message-ID: <4E847A8F.3070401@mrabarnett.plus.com>

On 29/09/2011 04:05, Ben Finney wrote:
> Devin Jeanpierre<jeanpierreda at gmail.com>  writes:
>
>>> Forget money, or even the love of money. The idea that one mustn't
>>> criticise another person's beliefs is the root of all evil.
>>
>> This was a technical discussion, and calling the bible a joke was not
>> necessary at all. It creates a hostile atmosphere.
>
> I disagree. It was not an attack on any person nor group of people. If
> we are to be required to avoid jokes not directed at people, then *that*
> is an atmosphere hostile to open friendly discussion.
>
>> Can't you pick somewhere else to attack Christianity?
>
> The person who wrote the ?bible is a joke? intended it as a flippant
> remark. Countless other flippant remarks pass through here all the time,
> making jokes at the expense of some idea or other. Christianity will not
> be an exception to that.
>
> If you find someone attacking people, I'll join you in ostracising the
> attacker. But no, don't attempt to silence jokes that attack an idea.
>
> Off-topic? If we start discussing the content of the ideas being
> attacked, yeah, I'd say religion is pretty off-topic.
>
> But the topic of keeping this forum safe for technical discussion
> entails that it must be safe for *any* idea to be the butt of a joke, be
> it a religious text or the Zen of Python, and that is very much
> on-topic.
>
Even if it offends Python worshippers?
http://www.youtube.com/watch?v=asUyK6JWt9U


From martin.hellwig at gmail.com  Thu Sep 29 10:25:40 2011
From: martin.hellwig at gmail.com (Martin P. Hellwig)
Date: Thu, 29 Sep 2011 15:25:40 +0100
Subject: Python without a tty
In-Reply-To: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j61v4o$52e$1@dont-email.me>

On 29/09/2011 10:21, Steven D'Aprano wrote:
> I have a Python script which I would like to test without a tty attached
> to the process. I could run it as a cron job, but is there an easier way?
>
> I am running Linux.
>
>
>
Well you could double fork and drop the parent, that would lose the tty
which is the same effect what you get when you want a daemon.

-- 
mph


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From: brandtrade08 at 126.com (jerser-2009)
Date: Thu, 29 Sep 2011 07:26:15 -0700 (PDT)
Subject: Nike Air Max LeBron VIII
Message-ID: <81a0b983-ea36-45ff-b482-450d07eed5ed@g23g2000vbz.googlegroups.com>

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From brian.curtin at gmail.com  Thu Sep 29 10:27:43 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Thu, 29 Sep 2011 09:27:43 -0500
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <pan.2011.09.29.00.10.37.975000@nowhere.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1543.1317248503.27778.python-list@python.org>
	<pan.2011.09.29.00.10.37.975000@nowhere.com>
Message-ID: <CAD+XWwok627Do=JcE+JSBDUJT8A0p6+dSa6tzEiM+FcQo08SDA@mail.gmail.com>

On Wed, Sep 28, 2011 at 19:10, Nobody <nobody at nowhere.com> wrote:

> On Wed, 28 Sep 2011 15:21:25 -0700, Ned Deily wrote:
>
> > No, it was a deliberate decision.  After a release is in security-fix
> > mode only, we don't build Windows or Mac OS X installers for them.
>
> But you continue to offer the installers for the unfixed version.


No one would use Python if we literally forced everyone to upgrade based on
our schedule by removing any trace of previous installers.

Also, "unfixed" is relative. You're only vulnerable if you're using urllib
to request resources which may end up being 302 redirected. I personally
don't need that fix, so 2.6.6 would be alright with me.
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From bcloete at gmail.com  Thu Sep 29 10:45:53 2011
From: bcloete at gmail.com (Bradley Cloete)
Date: Thu, 29 Sep 2011 16:45:53 +0200
Subject: Python without a tty
In-Reply-To: <4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CACGgnMCPVqTXOvj2rXWDLn1pOwYa=63wqaVAxo7tW+LASaMe3A@mail.gmail.com>

> It doesn't appear so to me.
>
> [steve at sylar ~]$ tty
> /dev/pts/16
> [steve at sylar ~]$ setsid tty
> /dev/pts/16
>
> [steve at sylar ~]$ python -c "import sys,os; print
> os.isatty(sys.stdout.fileno())"
> True
> [steve at sylar ~]$ setsid python -c "import sys,os; print
> os.isatty(sys.stdout.fileno())"
> True
>
>
> If I run the same Python command (without the setsid) as a cron job, I
> get False emailed to me. That's the effect I'm looking for.
>
>
Maybe nohup is what you looking for?

>From the info pages...

"`nohup' runs the given COMMAND with hangup signals ignored, so that the
command can continue running in the background after you log out.
Synopsis:

     nohup COMMAND [ARG]...

   If standard output is a terminal, it is redirected so that it is
appended to the file `nohup.out'; if that cannot be written to, it is
appended to the file `$HOME/nohup.out'.  If that cannot be written to,
the command is not run.  If standard output is not a terminal, then the
standard output of COMMAND will be the same as that of `nohup'.

"

Regards
Bradley
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From subhagurgaon2011 at gmail.com  Thu Sep 29 12:11:41 2011
From: subhagurgaon2011 at gmail.com (Subhabrata Banerjee)
Date: Thu, 29 Sep 2011 09:11:41 -0700 (PDT)
Subject: Question on Manipulating List and on Python
Message-ID: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>

Dear Group,

I have two questions one on list manipulation and other on Python.

(i) I have a file of lists. Now, the first digit starts with a number
or index, like,

[001, "Obama", "USA", "President"]
[002  "Major", "UK", "PM"]
[003  "Singh", "INDIA", "PM"]

Initially, I am reading the file and taking as
for line in file:
    line_word=line.split
    print line_word

I am getting the above result. But, my problem is if I read the array
position 0, which is a number then it should give me reciprocal words
like
if
word1=line_word[0]
if word1==001:
    I should get line_word[1], line_word[2] reciprocating the value.

Predefining it solves the problem, but I want to capture and do as it
iterates. If any one can help?

(ii) My second question is posted by one of my colleagues, what makes
Python so fast?

Regards,
Subhabrata Banerjee.


From gordon at panix.com  Thu Sep 29 12:27:49 2011
From: gordon at panix.com (John Gordon)
Date: Thu, 29 Sep 2011 16:27:49 +0000 (UTC)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
Message-ID: <j626a5$5he$1@reader1.panix.com>

In <a6679459-fc57-4389-8d43-1e5ed960d85d at y18g2000yqy.googlegroups.com> Subhabrata Banerjee <subhagurgaon2011 at gmail.com> writes:

> (i) I have a file of lists. Now, the first digit starts with a number
> or index, like,

> [001, "Obama", "USA", "President"]
> [002  "Major", "UK", "PM"]
> [003  "Singh", "INDIA", "PM"]

> Initially, I am reading the file and taking as
> for line in file:
>     line_word=line.split
>     print line_word

This isn't your actual code.  Please show us your real code, along with
a sample of your input file.

> (ii) My second question is posted by one of my colleagues, what makes
> Python so fast?

Fast compared to what?  Why does your colleague believe it should be
slower?

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From dwblas at gmail.com  Thu Sep 29 12:34:00 2011
From: dwblas at gmail.com (David)
Date: Thu, 29 Sep 2011 09:34:00 -0700 (PDT)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
Message-ID: <12c2b6e4-5fa4-44ed-83f4-2a969ae4076b@8g2000yqm.googlegroups.com>

> word1=line_word[0]
> if word1==001:


You are comparing a string and an integer assuming you are reading a
text file.

integers
word1=int(line_word[0])
if word1=1:

strings
word1=line_word[0]
if word1=="001:"



From anikom15 at gmail.com  Thu Sep 29 12:34:25 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 09:34:25 -0700
Subject: Suggested coding style
In-Reply-To: <4e844a83$0$29982$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<mailman.1558.1317277459.27778.python-list@python.org>
	<4e844a83$0$29982$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110929163425.GA10980@Smoke>

On Thu, Sep 29, 2011 at 08:37:53PM +1000, Steven D'Aprano wrote:
> Westley Mart?nez wrote:
> 
> > Perhaps you should spend a little less time on the mailing list and a
> > little more time in church.
> 
> Is that meant as punishment for Rick or for the churchgoers?
> 
> 

Hopefully neither, probably both.


From subhagurgaon2011 at gmail.com  Thu Sep 29 12:36:29 2011
From: subhagurgaon2011 at gmail.com (Subhabrata Banerjee)
Date: Thu, 29 Sep 2011 09:36:29 -0700 (PDT)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
Message-ID: <71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>

On Sep 29, 9:27?pm, John Gordon <gor... at panix.com> wrote:
> In <a6679459-fc57-4389-8d43-1e5ed960d... at y18g2000yqy.googlegroups.com> Subhabrata Banerjee <subhagurgaon2... at gmail.com> writes:
>
> > (i) I have a file of lists. Now, the first digit starts with a number
> > or index, like,
> > [001, "Obama", "USA", "President"]
> > [002 ?"Major", "UK", "PM"]
> > [003 ?"Singh", "INDIA", "PM"]
> > Initially, I am reading the file and taking as
> > for line in file:
> > ? ? line_word=line.split
> > ? ? print line_word
>
> This isn't your actual code. ?Please show us your real code, along with
> a sample of your input file.
>
> > (ii) My second question is posted by one of my colleagues, what makes
> > Python so fast?
>
> Fast compared to what? ?Why does your colleague believe it should be
> slower?
>
> --
> John Gordon ? ? ? ? ? ? ? ? ? A is for Amy, who fell down the stairs
> gor... at panix.com ? ? ? ? ? ? ?B is for Basil, assaulted by bears
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? -- Edward Gorey, "The Gashlycrumb Tinies"

Hi John,
The actual code is till now is:

def name_debugger(n):
    open_file=open("/python27/name1.txt")
    for line in open_file:
        line_word=line.split()
        #print line_word
        word1=line_word[0]
        print word1


And Python seems faster than C++/Java. It is indeed. I also experience
it.

Regards,
Subhabrata Banerjee.


From clp2 at rebertia.com  Thu Sep 29 12:37:28 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 29 Sep 2011 09:37:28 -0700
Subject: Question on Manipulating List and on Python
In-Reply-To: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
Message-ID: <CAMZYqRTY09hsLjQ4A0Cu_cZ7uMH-hofRz9dve=Hyvw+htrLqBg@mail.gmail.com>

On Thu, Sep 29, 2011 at 9:11 AM, Subhabrata Banerjee
<subhagurgaon2011 at gmail.com> wrote:
> Dear Group,
>
> I have two questions one on list manipulation and other on Python.
>
> (i) I have a file of lists. Now, the first digit starts with a number
> or index, like,
>
> [001, "Obama", "USA", "President"]
> [002 ?"Major", "UK", "PM"]
> [003 ?"Singh", "INDIA", "PM"]
>
> Initially, I am reading the file and taking as
> for line in file:
> ? ?line_word=line.split
> ? ?print line_word
>
> I am getting the above result. But, my problem is if I read the array
> position 0, which is a number then it should give me reciprocal words
> like
> if
> word1=line_word[0]
> if word1==001:
> ? ?I should get line_word[1], line_word[2] reciprocating the value.
>
> Predefining it solves the problem, but I want to capture and do as it
> iterates. If any one can help?

I'm not really clear what you mean by "reciprocal", so this is just a
guess: Perhaps you want list slicing?

>>> line_word = ["001", "Obama", "USA", "President"]
>>> print(line_word[1:])
['Obama', 'USA', 'President']
>>>

Details: http://stackoverflow.com/questions/509211/good-primer-for-python-slice-notation

> (ii) My second question is posted by one of my colleagues, what makes
> Python so fast?

CPython is actually relatively slow compared to the primary
implementations of other languages since Python highly dynamic, and
interpreted rather than compiled to machine code (normally). There are
currently some promising efforts (like PyPy) to produce a faster
implementation however.

Cheers,
Chris
--
http://rebertia.com


From moky.math at gmail.com  Thu Sep 29 12:39:51 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Thu, 29 Sep 2011 18:39:51 +0200
Subject: Question on Manipulating List and on Python
In-Reply-To: <j626a5$5he$1@reader1.panix.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
Message-ID: <4E849F57.4010101@gmail.com>

Le 29/09/2011 18:27, John Gordon a ?crit :
> In<a6679459-fc57-4389-8d43-1e5ed960d85d at y18g2000yqy.googlegroups.com>  Subhabrata Banerjee<subhagurgaon2011 at gmail.com>  writes:
>
>>  (i) I have a file of lists. Now, the first digit starts with a number
>>  or index, like,
>
>>  [001, "Obama", "USA", "President"]
>>  [002  "Major", "UK", "PM"]
>>  [003  "Singh", "INDIA", "PM"]

What about creating a dictionary ?

dic = {1:["Obama","USA","President"],2:[etc.]]


>>  (ii) My second question is posted by one of my colleagues, what makes
>>  Python so fast?

If your colleague is used to program inside Word macros, I guess the 
answer ;) If he is used to program in C, I'm less sure.
It really depends on the context of the question.

Laurent


From anikom15 at gmail.com  Thu Sep 29 12:42:11 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 09:42:11 -0700
Subject: Suggested coding style
In-Reply-To: <fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <20110929164211.GA11016@Smoke>

On Thu, Sep 29, 2011 at 05:23:30AM -0700, rantingrick wrote:
> On Sep 29, 5:37?am, Passiday <passi... at gmail.com> wrote:
>  
> What is so bad about breaking code in obscure places? We changed print
> to a function which broke just about every piece of code every written
> in this language. (BTW, print should ALWAYS have been a function!)
> What is so bad then about breaking some very obscure code? We could
> always have a lengthy deprecation period.
> 

Well, I once thought that a print function made a lot of sense.  In C,
printf is a function, however then I think why print is a function.  In
C, just about every function has side effects (the return values are
more often than not either pointers or status codes).  In Python
functions are encouraged to not have side-effects, so the implementation
of print as a statement or a method makes far more sense than as a
function.

But maybe I'm just batty as you all think I am.


From rosuav at gmail.com  Thu Sep 29 12:50:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 02:50:49 +1000
Subject: Question on Manipulating List and on Python
In-Reply-To: <71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
Message-ID: <CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>

On Fri, Sep 30, 2011 at 2:36 AM, Subhabrata Banerjee
<subhagurgaon2011 at gmail.com> wrote:
> And Python seems faster than C++/Java. It is indeed. I also experience
> it.
>

Python compared to Java? Difficult to compare. Python to C++?
Impossible to compare. But performance depends MASSIVELY on
algorithmic quality; if you code the exact same thing in Python and in
C++, you would probably find that the C++ one is faster, but chances
are you're implementing approximately the same thing in two quite
different ways. Or possibly you're using a slow and inefficient
library or third-party function.

I've sometimes written code in one language and directly ported it to
another, and then run both on the same hardware. With most such
experiments, CPython generally doesn't perform all that well, and C or
C++ rocks. But frequently, the C/C++ code is more verbose and more
error-prone than the Python - because Python's biggest boast is not
that it's fast, but that it's *fast enough*, while being easy to work
with. (And every once in a while there's something where I want to use
a pointer to some other variable, and that's a concept that just plain
doesn't work in Python. You have references to objects, but you can't
from one place change another variable, without using some kind of
mutable object that they both reference.)

ChrisA


From miki.tebeka at gmail.com  Thu Sep 29 12:52:07 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 29 Sep 2011 09:52:07 -0700 (PDT)
Subject: options for plotting points on geographic map
In-Reply-To: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
References: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
Message-ID: <28071425.854.1317315127547.JavaMail.geo-discussion-forums@prfb12>

Probably the google maps routes will be faster (maybe using embedded webkit window). However it requires internet connection.

See also http://www.scipy.org/Cookbook/Matplotlib/Maps

HTH
--
Miki Tebeka <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From gordon at panix.com  Thu Sep 29 12:52:53 2011
From: gordon at panix.com (John Gordon)
Date: Thu, 29 Sep 2011 16:52:53 +0000 (UTC)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
Message-ID: <j627p5$bsd$1@reader1.panix.com>

In <71c71a9d-928d-4ebe-af64-674c31bc1c09 at e9g2000vby.googlegroups.com> Subhabrata Banerjee <subhagurgaon2011 at gmail.com> writes:

> Hi John,
> The actual code is till now is:

> def name_debugger(n):
>     open_file=3Dopen("/python27/name1.txt")
>     for line in open_file:
>         line_word=3Dline.split()
>         #print line_word
>         word1=3Dline_word[0]
>         print word1

Can you give us some sample lines from /python27/name1.txt ?

> And Python seems faster than C++/Java. It is indeed. I also experience
> it.

It shouldn't be inherently faster than C++ or Java.  If it is, it's
because the C++ or Java code is doing more work.

Do you have a sample Python program and a sample C++ or Java program
to demonstrate the speed difference?

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From rosuav at gmail.com  Thu Sep 29 13:02:29 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 03:02:29 +1000
Subject: Suggested coding style
In-Reply-To: <20110929164211.GA11016@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<20110929164211.GA11016@Smoke>
Message-ID: <CAPTjJmqYNG8DCxRH0RiLVGa0bkXpPjbHE1bqc8dRXFHggBwWgw@mail.gmail.com>

On Fri, Sep 30, 2011 at 2:42 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> But maybe I'm just batty as you all think I am.

Yes, I'm afraid so. Bonkers. Off your head. But let me tell you a
secret... All the best people are.

> Well, I once thought that a print function made a lot of sense. ?In C,
> printf is a function, however then I think why print is a function. ?In
> C, just about every function has side effects (the return values are
> more often than not either pointers or status codes). ?In Python
> functions are encouraged to not have side-effects, so the implementation
> of print as a statement or a method makes far more sense than as a
> function.

Since functions and methods in Python are practically the same thing,
I don't know that there really need be any difference in policy. But I
do like any reduction in the number of "special features" of a
language. If screen output can be done as an ordinary function taking
ordinary arguments, that's better than having a special language
construct. Also, it's just plain stupid and yet just plain cool to be
able to:

print = sys.stderr.write

and smoothly redirect all your prints to stderr. (Unfortunately this
doesn't quite work, as it means you don't get your newlines put in for
you, but there's sure to be an equally stupid/cool reassignment
available.)

ChrisA


From moky.math at gmail.com  Thu Sep 29 13:08:52 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Thu, 29 Sep 2011 19:08:52 +0200
Subject: Counting the number of call of a function
Message-ID: <j628n2$vmq$1@news.univ-fcomte.fr>

    Hello


    Is it possible to count the number of time a function is called ?
Of course, if I've access to the source code, it's easy.

I tried the following :

def foo():
     print "foo !"


class wraper(object):
     def __init__(self,fun):
         globals()[fun]=self.replacement
     def replacement(*args):
         print "I'm replaced"

foo()
X=wraper(foo)
foo()

I was hoping that globals()[foo] would be replaced by my X.replacement 
and thus the second call to foo() was expected to print "I'm replaced".

Instead nothing is done.

By the way, I tried to print globals() inside __init__() to see what 
happens. It turns out that the entry 'foo' is never modified.

Any idea ?
I fact what I have to do is to add a decorator _a posteriori_ ...

Have a good night
Laurent





From rosuav at gmail.com  Thu Sep 29 13:20:30 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 03:20:30 +1000
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <CAPTjJmqP+rHVQ3MOjWGYPup2srrNRkQg49PzuoWmeGc6BFt5Yg@mail.gmail.com>

On Fri, Sep 30, 2011 at 3:08 AM, Laurent Claessens <moky.math at gmail.com> wrote:
> def foo():
> ? ?print "foo !"
>
>
> class wraper(object):
> ? ?def __init__(self,fun):
> ? ? ? ?globals()[fun]=self.replacement
> ? ?def replacement(*args):
> ? ? ? ?print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()

Are you able to change the call structure to:

foo() # unchanged
foo=wrapper(foo) # this changes it
foo() # should now be changed

perhaps? That would be a lot easier to manage. Then you could write
the wrapper thus:

class wrapper(object):
    def __init__(self,func):
        self.func=func
    def __call__(self,*args,**kwargs):
        print("I'm replaced!")  # if you want to be noisy
        self.count+=1
        self.func(*args,**kwargs)

Tested in Python 3; should also work in Python 2, which you appear to
be using. Effectively, I've written something that could actually be a
decorator, and then done the same sort of thing that a decorator does
by rebinding the name.

ChrisA


From rosuav at gmail.com  Thu Sep 29 13:22:12 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 03:22:12 +1000
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <CAPTjJmo9AZc4HFMHk+Oc7q6i7ydtmB+-rxxUDfiN=w75yR67Vg@mail.gmail.com>

On Fri, Sep 30, 2011 at 3:08 AM, Laurent Claessens <moky.math at gmail.com> wrote:
> class wraper(object):
> ? ?def __init__(self,fun):
> ? ? ? ?globals()[fun]=self.replacement
> ? ?def replacement(*args):
> ? ? ? ?print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()
>
> I was hoping that globals()[foo] would be replaced by my X.replacement and
> thus the second call to foo() was expected to print "I'm replaced".

Actually, I've just realized what your problem might be. Try:
X = wraper("foo")

You're indexing globals() with the actual function object, but you
want to index it with the function _name_. I do think that the
decorator technique will be a lot cleaner, though.

ChrisA


From python at mrabarnett.plus.com  Thu Sep 29 13:26:18 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 29 Sep 2011 18:26:18 +0100
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <4E84AA3A.7040209@mrabarnett.plus.com>

On 29/09/2011 18:08, Laurent Claessens wrote:
> Hello
>
>
> Is it possible to count the number of time a function is called ?
> Of course, if I've access to the source code, it's easy.
>
> I tried the following :
>
> def foo():
> print "foo !"
>
>
> class wraper(object):
> def __init__(self,fun):
> globals()[fun]=self.replacement
> def replacement(*args):
> print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()
>
> I was hoping that globals()[foo] would be replaced by my X.replacement
> and thus the second call to foo() was expected to print "I'm replaced".
>
> Instead nothing is done.
>
> By the way, I tried to print globals() inside __init__() to see what
> happens. It turns out that the entry 'foo' is never modified.
>
> Any idea ?
> I fact what I have to do is to add a decorator _a posteriori_ ...
>
The keys of globals() are the _names_. You're giving it the function
itself.

Try this:

class wraper(object):
     def __init__(self,fun):
         globals()[fun.__name__]=self.replacement
     def replacement(*args):
         print("I'm replaced")

A decorator would be better.


From clp2 at rebertia.com  Thu Sep 29 13:27:35 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 29 Sep 2011 10:27:35 -0700
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <CAMZYqRS2NGqpJoXakXF98pfpCMiprOp9HmvusakvATeLuc11XQ@mail.gmail.com>

On Thu, Sep 29, 2011 at 10:08 AM, Laurent Claessens <moky.math at gmail.com> wrote:
> ? Hello
>
>
> ? Is it possible to count the number of time a function is called ?
> Of course, if I've access to the source code, it's easy.
>
> I tried the following :
>
> def foo():
> ? ?print "foo !"
>
>
> class wraper(object):
> ? ?def __init__(self,fun):
> ? ? ? ?globals()[fun]=self.replacement
> ? ?def replacement(*args):
> ? ? ? ?print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()
>
> I was hoping that globals()[foo] would be replaced by my X.replacement and
> thus the second call to foo() was expected to print "I'm replaced".
>
> Instead nothing is done.

That's because globals() maps names (i.e. strings) to values, whereas
in this case `fun` is a function object, not a string. Trying to
subscript globals() with a non-string arguably ought to be an error.

By way of example (with irrelevant stuff elided):

Python 2.6.6 (r266:84292, Jan 12 2011, 13:35:00)
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo():
...     pass
...
>>> globals()
{..., 'foo': <function foo at 0x378170>}
>>> globals()[foo] = 42
>>> globals()
{..., <function foo at 0x378170>: 42, 'foo': <function foo at 0x378170>}
>>> globals()["foo"] = 99
>>> globals()
{..., 'foo': 99, <function foo at 0x378170>: 42}

Note that you can get the name of a function using its __name__
attribute. That is to say:
foo.__name__ == "foo"

> By the way, I tried to print globals() inside __init__() to see what
> happens. It turns out that the entry 'foo' is never modified.
>
> Any idea ?
> I fact what I have to do is to add a decorator _a posteriori_ ...

Recall that the decorator syntax:

@bar
def qux():
    pass

is basically equivalent to:

def qux():
    pass

qux = bar(qux)

Therefore, you want something like:

def wrapped(func):
    def replacement(*args, **kwargs):
        print "I'm replaced"
    return replacement

foo = wrapped(foo)
foo() # => I'm replaced

Cheers,
Chris
--
http://rebertia.com


From jeanpierreda at gmail.com  Thu Sep 29 14:49:05 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Thu, 29 Sep 2011 14:49:05 -0400
Subject: [OT] Benefit and belief
In-Reply-To: <87zkho2glb.fsf@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
Message-ID: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>

>> This was a technical discussion, and calling the bible a joke was not
>> necessary at all. It creates a hostile atmosphere.
>
> I disagree. It was not an attack on any person nor group of people. If
> we are to be required to avoid jokes not directed at people, then *that*
> is an atmosphere hostile to open friendly discussion.

Well. It wasn't directly an attack on people exactly. It did mention
believers directly. It could certainly be _interpreted_ as an attack
(and was interpreted that way), and that's really all that's necessary
for a hostile environment.

I'm not saying we should censor ourselves exactly. I've always been
opposed to harsh _rules_ about what's appropriate and what
isn't. But I do think it's important to consider others' feelings.
Just because it isn't an attack, doesn't mean it can't hurt peoples'
feelings, and I think hurting peoples' feelings is something worth
going out of your way to avoid.

Anyway, if it was a joke before, it isn't when somebody starts calling
some "group of people" "organised conspiracies to support and protect
child molesters".

> The person who wrote the ?bible is a joke? intended it as a flippant
> remark. Countless other flippant remarks pass through here all the time,
> making jokes at the expense of some idea or other. Christianity will not
> be an exception to that.

That doesn't make it right. Is it OK to make fun of arbitrary ideas as
"jokes"? I don't think so. It seems, again, hurtful. Especially when
the idea is totally unrelated. It's like we're having a discussion
about dynamic typing and somebody blurts out "Hahaha, static typing is
almost as dumb as Cartesian Dualism". The best case outcome is that
nobody cares. The worse case outcomes go down to hurt feelings and
flame wars from dualists.

> But the topic of keeping this forum safe for technical discussion
> entails that it must be safe for *any* idea to be the butt of a joke, be
> it a religious text or the Zen of Python, and that is very much
> on-topic.

It obviously isn't "safe" to joke about any topic, seeing as it caused
a derailment and new thread.

Devin

On Wed, Sep 28, 2011 at 11:05 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> Devin Jeanpierre <jeanpierreda at gmail.com> writes:
>
>> > Forget money, or even the love of money. The idea that one mustn't
>> > criticise another person's beliefs is the root of all evil.
>>
>> This was a technical discussion, and calling the bible a joke was not
>> necessary at all. It creates a hostile atmosphere.
>
> I disagree. It was not an attack on any person nor group of people. If
> we are to be required to avoid jokes not directed at people, then *that*
> is an atmosphere hostile to open friendly discussion.
>
>> Can't you pick somewhere else to attack Christianity?
>
> The person who wrote the ?bible is a joke? intended it as a flippant
> remark. Countless other flippant remarks pass through here all the time,
> making jokes at the expense of some idea or other. Christianity will not
> be an exception to that.
>
> If you find someone attacking people, I'll join you in ostracising the
> attacker. But no, don't attempt to silence jokes that attack an idea.
>
> Off-topic? If we start discussing the content of the ideas being
> attacked, yeah, I'd say religion is pretty off-topic.
>
> But the topic of keeping this forum safe for technical discussion
> entails that it must be safe for *any* idea to be the butt of a joke, be
> it a religious text or the Zen of Python, and that is very much
> on-topic.
>
> --
> ?\ ? ? ? ? ?We demand rigidly defined areas of doubt and uncertainty!? |
> ?`\ ? ??Vroomfondel, _The Hitch-Hiker's Guide To The Galaxy_, Douglas |
> _o__) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Adams |
> Ben Finney
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From petite.abeille at gmail.com  Thu Sep 29 15:32:20 2011
From: petite.abeille at gmail.com (Petite Abeille)
Date: Thu, 29 Sep 2011 21:32:20 +0200
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
Message-ID: <2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>


On Sep 29, 2011, at 8:49 PM, Devin Jeanpierre wrote:

>  It could certainly be _interpreted_ as an attack
> (and was interpreted that way), and that's really all that's necessary
> for a hostile environment.

In other news:

http://alt.textdrive.com/assets/public/non/nq050616.gif

--
Tout le monde il est beau, tout le monde il est gentil




From navkirat.py at gmail.com  Thu Sep 29 15:37:34 2011
From: navkirat.py at gmail.com (Navkirat Singh)
Date: Fri, 30 Sep 2011 01:07:34 +0530
Subject: [OT] Benefit and belief
In-Reply-To: <2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
Message-ID: <CAKzQzusJ9zRRDe1v8H1dDDcdyV_JUi2nS2WXvBhKrsv6Vb3aMQ@mail.gmail.com>

Hi,

I am looking for the python mailing list. . ? Have you guys seen it
somewhere? I think I accidently reached the cry-me-a-river list?

Regards,
Nav
On Sep 30, 2011 1:03 AM, "Petite Abeille" <petite.abeille at gmail.com> wrote:
>
> On Sep 29, 2011, at 8:49 PM, Devin Jeanpierre wrote:
>
>> It could certainly be _interpreted_ as an attack
>> (and was interpreted that way), and that's really all that's necessary
>> for a hostile environment.
>
> In other news:
>
> http://alt.textdrive.com/assets/public/non/nq050616.gif
>
> --
> Tout le monde il est beau, tout le monde il est gentil
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
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From ramit.prasad at jpmorgan.com  Thu Sep 29 15:39:48 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 29 Sep 2011 15:39:48 -0400
Subject: options for plotting points on geographic map
In-Reply-To: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
References: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F66B1B@EMARC112VS01.exchad.jpmchase.net>

>I see there is pymaps, a Python wrapper for Google Maps.  I may try
>that but it seems to be barely documented and would require making a
>webpage with javascript to display the map, whereas I'd probably
>prefer a desktop app for this--though I'd consider a web page (it's
>probably easier than I think).

You could create the webpage and then render it in your desktop app. I have seen plenty of apps like that.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423




This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ethan at stoneleaf.us  Thu Sep 29 15:52:23 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 29 Sep 2011 12:52:23 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
Message-ID: <4E84CC77.7060804@stoneleaf.us>

Petite Abeille wrote:
> On Sep 29, 2011, at 8:49 PM, Devin Jeanpierre wrote:
> 
>>  It could certainly be _interpreted_ as an attack
>> (and was interpreted that way), and that's really all that's necessary
>> for a hostile environment.
> 
> In other news:
> 
> http://alt.textdrive.com/assets/public/non/nq050616.gif


Okay, now that's funny.

~Ethan~


From ramit.prasad at jpmorgan.com  Thu Sep 29 15:52:52 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 29 Sep 2011 15:52:52 -0400
Subject: Question on Manipulating List and on Python
In-Reply-To: <CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
	<CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F66B77@EMARC112VS01.exchad.jpmchase.net>

-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Chris Angelico
Sent: Thursday, September 29, 2011 11:51 AM
To: python-list at python.org
Subject: Re: Question on Manipulating List and on Python

On Fri, Sep 30, 2011 at 2:36 AM, Subhabrata Banerjee
<subhagurgaon2011 at gmail.com> wrote:
> And Python seems faster than C++/Java. It is indeed. I also experience
> it.
>

Python compared to Java? Difficult to compare. Python to C++?
Impossible to compare. But performance depends MASSIVELY on
algorithmic quality; if you code the exact same thing in Python and in
C++, you would probably find that the C++ one is faster, but chances
are you're implementing approximately the same thing in two quite
different ways. Or possibly you're using a slow and inefficient
library or third-party function.

I've sometimes written code in one language and directly ported it to
another, and then run both on the same hardware. With most such
experiments, CPython generally doesn't perform all that well, and C or
C++ rocks. But frequently, the C/C++ code is more verbose and more
error-prone than the Python - because Python's biggest boast is not
that it's fast, but that it's *fast enough*, while being easy to work
with. (And every once in a while there's something where I want to use
a pointer to some other variable, and that's a concept that just plain
doesn't work in Python. You have references to objects, but you can't
from one place change another variable, without using some kind of
mutable object that they both reference.)
-----------------------------------------------------------------------


I think Steven D'Aprano had an excellent post on this a week or so ago (on the tutor list, not this one).

See: http://mail.python.org/pipermail/tutor/2011-September/085573.html 




Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



ChrisA
-- 
http://mail.python.org/mailman/listinfo/python-list
This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From petite.abeille at gmail.com  Thu Sep 29 15:54:54 2011
From: petite.abeille at gmail.com (Petite Abeille)
Date: Thu, 29 Sep 2011 21:54:54 +0200
Subject: [OT] Benefit and belief
In-Reply-To: <CAKzQzusJ9zRRDe1v8H1dDDcdyV_JUi2nS2WXvBhKrsv6Vb3aMQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
	<CAKzQzusJ9zRRDe1v8H1dDDcdyV_JUi2nS2WXvBhKrsv6Vb3aMQ@mail.gmail.com>
Message-ID: <3D981489-D106-459B-91C1-73DE3A45B79C@gmail.com>


On Sep 29, 2011, at 9:37 PM, Navkirat Singh wrote:

> I am looking for the python mailing list. . ? Have you guys seen it
> somewhere? I think I accidently reached the cry-me-a-river list?

The portal can be reactivated by intoning Bobby Brown Goes Down in unison.



From chris at simplistix.co.uk  Thu Sep 29 17:00:58 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Thu, 29 Sep 2011 22:00:58 +0100
Subject: TestFixtures 2.1.0 Released!
Message-ID: <4E84DC8A.4040508@simplistix.co.uk>

Hi All,

Another release of TestFixtures, getting things closer to where I want 
them to be.

The only change was:

- Add a "strict mode" to `compare`. When used, it ensures that
   the values compared are not only equal but also of the same
   type. This mode is not used by default, and the default mode
   restores the more commonly useful functionality where values of
   similar types but that aren't equal give useful feedback about
   differences.

For details, read:

http://packages.python.org/testfixtures/comparing.html#strict-comparison

The full list of changes can be found here:

http://packages.python.org/testfixtures/changes.html

The package is on PyPI and a full list of all the links to docs, issue 
trackers and the like can be found here:

http://www.simplistix.co.uk/software/python/testfixtures

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
            - http://www.simplistix.co.uk


From anikom15 at gmail.com  Thu Sep 29 17:20:15 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 14:20:15 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
Message-ID: <20110929212015.GA11663@Smoke>

On Thu, Sep 29, 2011 at 02:49:05PM -0400, Devin Jeanpierre wrote:
> >> This was a technical discussion, and calling the bible a joke was not
> >> necessary at all. It creates a hostile atmosphere.
> >
> > I disagree. It was not an attack on any person nor group of people. If
> > we are to be required to avoid jokes not directed at people, then *that*
> > is an atmosphere hostile to open friendly discussion.
> 
> Well. It wasn't directly an attack on people exactly. It did mention
> believers directly. It could certainly be _interpreted_ as an attack
> (and was interpreted that way), and that's really all that's necessary
> for a hostile environment.
> 
> I'm not saying we should censor ourselves exactly. I've always been
> opposed to harsh _rules_ about what's appropriate and what
> isn't. But I do think it's important to consider others' feelings.
> Just because it isn't an attack, doesn't mean it can't hurt peoples'
> feelings, and I think hurting peoples' feelings is something worth
> going out of your way to avoid.
> 
> Anyway, if it was a joke before, it isn't when somebody starts calling
> some "group of people" "organised conspiracies to support and protect
> child molesters".
> 
> > The person who wrote the ?bible is a joke? intended it as a flippant
> > remark. Countless other flippant remarks pass through here all the time,
> > making jokes at the expense of some idea or other. Christianity will not
> > be an exception to that.
> 
> That doesn't make it right. Is it OK to make fun of arbitrary ideas as
> "jokes"? I don't think so. It seems, again, hurtful. Especially when
> the idea is totally unrelated. It's like we're having a discussion
> about dynamic typing and somebody blurts out "Hahaha, static typing is
> almost as dumb as Cartesian Dualism". The best case outcome is that
> nobody cares. The worse case outcomes go down to hurt feelings and
> flame wars from dualists.
> 
> > But the topic of keeping this forum safe for technical discussion
> > entails that it must be safe for *any* idea to be the butt of a joke, be
> > it a religious text or the Zen of Python, and that is very much
> > on-topic.
> 
> It obviously isn't "safe" to joke about any topic, seeing as it caused
> a derailment and new thread.
> 

Sometimes it's just not appropriate to joke.  Save them for the dates.


From ben+python at benfinney.id.au  Thu Sep 29 17:24:15 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 07:24:15 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
Message-ID: <87r52z2gao.fsf@benfinney.id.au>

Passiday <passiday at gmail.com> writes:

> Oh, my. Who could expect this topic would iterate to some whining
> about religion (please don't respond on this remark of mine).

That's an unreasonable request. If you make a provocative remark (I
doubt you chose to use ?whining? without knowing how dismissive it is),
it's disingenuous to then ask that people please not respond.

-- 
 \     ?If nothing changes, everything will remain the same.? ?Barne's |
  `\                                                               Law |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Thu Sep 29 17:32:42 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 07:32:42 +1000
Subject: [OT] Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<mailman.1566.1317305041.27778.python-list@python.org>
Message-ID: <87mxdn2fwl.fsf@benfinney.id.au>

MRAB <python at mrabarnett.plus.com> writes:

> On 29/09/2011 04:05, Ben Finney wrote:
> > But the topic of keeping this forum safe for technical discussion
> > entails that it must be safe for *any* idea to be the butt of a
> > joke, be it a religious text or the Zen of Python, and that is very
> > much on-topic.
>
> Even if it offends Python worshippers?
> http://www.youtube.com/watch?v=asUyK6JWt9U

Even then. People who remain attached to ideas are being unreasonable if
they take a joke about that idea personally. No idea, certainly not any
religion, gets any special exemption.

-- 
 \     ?On the other hand, you have different fingers.? ?Steven Wright |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From anikom15 at gmail.com  Thu Sep 29 17:33:34 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 14:33:34 -0700
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <4E847A8F.3070401@mrabarnett.plus.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
Message-ID: <20110929213334.GB11663@Smoke>

I'm kind of new to the whole mailing list thing, but they seem to be a
lot more lenient than internet forums about most things.  I've noticed
that sometimes Off-topic posts can get a little out of hand.  I guess
it's not really a big deal, but it bothers me, and the trolls just love
to feed on it.  I mean, as programmers, we should devote our time to
improving computer systems.  On this mailing list, we're programmers,
nothing else, and so we shouldn't mingle other things into the list.
Think of it as using global variables or even a goto.  That's
essentially what OT is.  It just serves to obfuscate valuable answers to
good programming questions.


From rosuav at gmail.com  Thu Sep 29 17:40:13 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 07:40:13 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <20110929213334.GB11663@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<20110929213334.GB11663@Smoke>
Message-ID: <CAPTjJmo1GmVcaF6LuX=N8mS66KwnHfYsKthy84xNp-DnpWpa2g@mail.gmail.com>

On Fri, Sep 30, 2011 at 7:33 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> On this mailing list, we're programmers,
> nothing else, and so we shouldn't mingle other things into the list.
> Think of it as using global variables or even a goto. ?That's
> essentially what OT is.

Not a bad analogy, that... but I accept it in perhaps not the same way
as you intended it.

I don't mind using a global variable once in a while. I don't object
to a well-placed goto, especially when it's clear and obvious what
it's doing. And the occasional off-topic post or thread on a mailing
list isn't the end of the world either.

ChrisA


From ben+python at benfinney.id.au  Thu Sep 29 18:01:32 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 08:01:32 +1000
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
Message-ID: <20110929220132.GD2715@benfinney.id.au>

On 29-Sep-2011, Devin Jeanpierre wrote:
> >> This was a technical discussion, and calling the bible a joke was not
> >> necessary at all. It creates a hostile atmosphere.
> >
> > I disagree. It was not an attack on any person nor group of people. If
> > we are to be required to avoid jokes not directed at people, then *that*
> > is an atmosphere hostile to open friendly discussion.
> 
> Well. It wasn't directly an attack on people exactly. It did mention
> believers directly.

It did not. It mentioned only a pair of texts: the bible, and the Zen of
Python. Texts are not people, and we should not go out of our way to
protect them from jokes or criticism.

> It could certainly be _interpreted_ as an attack (and was interpreted
> that way), and that's really all that's necessary for a hostile
> environment.

Nonsense. *Any* joke could be interpreted as an attack; the issue is
whether it's reasonable to do so. Anyone who is so confused as to take a
joke about a book as an attack on people is being quite unreasonable, and
we should not restrain our jokes for the sake of that.

> I'm not saying we should censor ourselves exactly. I've always been
> opposed to harsh _rules_ about what's appropriate and what
> isn't. But I do think it's important to consider others' feelings.

Agreed. But only to the extent that attacks *on those people* are
concerned. Peoples feelings about ideas are not a consideration when
discussing ideas, and certainly not when joking about ideas.

> Just because it isn't an attack, doesn't mean it can't hurt peoples'
> feelings, and I think hurting peoples' feelings is something worth
> going out of your way to avoid.

There we disagree. The hurt feelings of someone who attaches their identity
to a text should not restrain our discourse.

> Anyway, if it was a joke before, it isn't when somebody starts calling
> some "group of people" "organised conspiracies to support and protect
> child molesters".

The group of people to whom that refers, the administrative hierarchy of
the Catholic Church, have been doing exactly what the quotation says.

I agree that's not a joke; it's a matter of fact, and relevant in the
context where it was mentioned.

> Is it OK to make fun of arbitrary ideas as "jokes"? I don't think so.

Yes, a thousand times yes. Ideas are not people, have no rights, and get no
exemption from criticism or dismissal or attack or ridicule.

> It seems, again, hurtful. Especially when the idea is totally unrelated.

That would eliminate just about every joke: a huge range of jokes *depend*
for their humour on connecting seemingly-unrelated ideas. So by your logic,
we don't get to make those jokes here.

> It's like we're having a discussion about dynamic typing and somebody
> blurts out "Hahaha, static typing is almost as dumb as Cartesian
> Dualism". The best case outcome is that nobody cares. The worse case
> outcomes go down to hurt feelings and flame wars from dualists.

And the joke would still be okay, and it would be silly for anyone to take
it as hurtful.

You can call such a joke off-topic, and I'd agree. You can say it's not
very funny, and I'd agree. You can say it's undeserving of a flame war, and
I'd agree wholeheartedly.

But whoever takes that joke and says it's deliberately hurtful is being
presumptuous and censorious and unreasonable. If they then castigate the
joker for supposedly hurting someone's feelings, it's at that point the
atmosphere turns hostile to discussion.

-- 
 \         ?The most dangerous man to any government is the man who is |
  `\       able to think things out for himself, without regard to the |
_o__)          prevailing superstitions and taboos.? ?Henry L. Mencken |
Ben Finney <ben at benfinney.id.au>
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From ian.g.kelly at gmail.com  Thu Sep 29 18:12:51 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 16:12:51 -0600
Subject: Suggested coding style
In-Reply-To: <fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <CALwzid==3YBr-NWaZBBb03uByB+mgkbUnEF1Fzk98D_=CW8YvA@mail.gmail.com>

On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingrick at gmail.com> wrote:
> A specific method for padding a string with ONLY zeros is ludicrous
> and exposes the narrow mindedness of the creator. The only thing worse
> than "zfill" as a string method is making zfill into built-in
> function! The ONLY proper place for zfill is as an option in the
> str.format() method.
>
> py> "{0:zf10}".format(1234) -> "00000000001234"

Agree that zfill seems to be redundant with str.format, although your
suggested syntax is atrocious, especially since a syntax already
exists that fits better in the already-complicated format specifier
syntax.

"{0:=010d}".format(1234) -> "0000001234"

There are a couple of warts with the existing implementation, however:

1) str.zfill() operates on strings; the .format() syntax operates on
numeric types.  I would suggest that the "=" fill alignment in format
specifiers should be extended to do the same thing as zfill when given
a string.

2) It seems to not behave as documented for floats.  I expect:

"{0:=010f}".format(-32.7) -> "-0000032.7"

I get:

"{0:=010f}".format(-32.7) -> "-32.700000"

On the other hand, I can't imagine why I would ever actually want the
expected result, so maybe it's not a big deal.


From clp2 at rebertia.com  Thu Sep 29 18:16:43 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 29 Sep 2011 15:16:43 -0700
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <20110929213334.GB11663@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<20110929213334.GB11663@Smoke>
Message-ID: <CAMZYqRQrUWqRaf-rKB=a9WUHX9L0tOuNtEp0+V9xy6XJCzGyLg@mail.gmail.com>

On Thu, Sep 29, 2011 at 2:33 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> I'm kind of new to the whole mailing list thing, but they seem to be a
> lot more lenient than internet forums about most things. ?I've noticed
> that sometimes Off-topic posts can get a little out of hand. ?I guess
> it's not really a big deal, but it bothers me, and the trolls just love
> to feed on it. ?I mean, as programmers, we should devote our time to
> improving computer systems.

This is why good mail clients have a "Mute" or equivalent function to
ignore an entire thread and not let it waste any more of your time.

You may want to plonk Xah and the ranter who goes by Rick while you're at it. :)

Cheers,
Chris


From rantingrick at gmail.com  Thu Sep 29 18:56:57 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 15:56:57 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
Message-ID: <db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>

On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
> > A specific method for padding a string with ONLY zeros is ludicrous
> > and exposes the narrow mindedness of the creator. The only thing worse
> > than "zfill" as a string method is making zfill into built-in
> > function! The ONLY proper place for zfill is as an option in the
> > str.format() method.
>
> > py> "{0:zf10}".format(1234) -> "00000000001234"
>
> Agree that zfill seems to be redundant with str.format, although your
> suggested syntax is atrocious, especially since a syntax already
> exists that fits better in the already-complicated format specifier
> syntax.

It's interesting that you find the format specifier "complicated". I
will admit that upon first glance i lamented the new format method
spec and attempted to cling to the old string interpolation crap.
However, as you use the new format method you will come to appreciate
it. It's an adult beverage with an acquired taste. ;-)

One thing that may help format noobs is to look at the spec as two
parts; the part before the colon and the part after the colon. If you
break it down in this manner the meaning starts to shine through. I
will agree, it is a lot of cryptic info squeezed into a small space
HOWEVER you would no want a verbose format specification.

But i wholeheartedly agree with you points and i would say the zfill
method has no future uses in the stdlib except for historical reasons.
We should deprecate it now.


> "{0:=010d}".format(1234) -> "0000001234"
>
> There are a couple of warts with the existing implementation, however:
>
> 1) str.zfill() operates on strings; the .format() syntax operates on
> numeric types. ?I would suggest that the "=" fill alignment in format
> specifiers should be extended to do the same thing as zfill when given
> a string.

EXACTLY!

PS: Has anyone noticed all the off topic chatter about religion and
feelings? Since the main subject of this thread is about zfill i can't
help but wonder if the minions where sent out to present a distraction
with "scripted" pseudo arguments. Just an observation.


From jeanpierreda at gmail.com  Thu Sep 29 19:03:24 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Thu, 29 Sep 2011 19:03:24 -0400
Subject: [OT] Benefit and belief
In-Reply-To: <20110929220132.GD2715@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
Message-ID: <CABicbJKDws8sv+9FkPHknQjabGCK-x7j=kZnLtrS+YV-Gx7DLQ@mail.gmail.com>

> There we disagree. The hurt feelings of someone who attaches their identity
> to a text should not restrain our discourse.

Yes, we do.

> That would eliminate just about every joke: a huge range of jokes *depend*
> for their humour on connecting seemingly-unrelated ideas. So by your logic,
> we don't get to make those jokes here.

I didn't have much logic. I just don't think it's nice to do things
that hurt other people, and if we can, we should avoid those things.
Avoiding them is pretty easy here.

> But whoever takes that joke and says it's deliberately hurtful is being
> presumptuous and censorious and unreasonable. If they then castigate the
> joker for supposedly hurting someone's feelings, it's at that point the
> atmosphere turns hostile to discussion.

I don't really care about the "joke". I honestly I didn't understand
it as a joke, which would drive most of my disagrement. I don't think
it should have been made, yes. I take major issue with the
anti-Christian rant that appeared afterward, but I haven't really
taken much opportunity to attack it because it doesn't matter. All I'd
like is for people to be a little more friendly, if you please.

I also didn't reprimand anyone, except maybe Steven.

But anyway, no, we don't agree on what it means to be friendly or what
a hostile atmosphere is. I've noticed that people tend to be a lot
harsher here than what I'm used to, so perhaps your attitude to it is
more common on mailing-lists and I should just adapt.

Devin

On Thu, Sep 29, 2011 at 6:01 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> On 29-Sep-2011, Devin Jeanpierre wrote:
>> >> This was a technical discussion, and calling the bible a joke was not
>> >> necessary at all. It creates a hostile atmosphere.
>> >
>> > I disagree. It was not an attack on any person nor group of people. If
>> > we are to be required to avoid jokes not directed at people, then *that*
>> > is an atmosphere hostile to open friendly discussion.
>>
>> Well. It wasn't directly an attack on people exactly. It did mention
>> believers directly.
>
> It did not. It mentioned only a pair of texts: the bible, and the Zen of
> Python. Texts are not people, and we should not go out of our way to
> protect them from jokes or criticism.
>
>> It could certainly be _interpreted_ as an attack (and was interpreted
>> that way), and that's really all that's necessary for a hostile
>> environment.
>
> Nonsense. *Any* joke could be interpreted as an attack; the issue is
> whether it's reasonable to do so. Anyone who is so confused as to take a
> joke about a book as an attack on people is being quite unreasonable, and
> we should not restrain our jokes for the sake of that.
>
>> I'm not saying we should censor ourselves exactly. I've always been
>> opposed to harsh _rules_ about what's appropriate and what
>> isn't. But I do think it's important to consider others' feelings.
>
> Agreed. But only to the extent that attacks *on those people* are
> concerned. Peoples feelings about ideas are not a consideration when
> discussing ideas, and certainly not when joking about ideas.
>
>> Just because it isn't an attack, doesn't mean it can't hurt peoples'
>> feelings, and I think hurting peoples' feelings is something worth
>> going out of your way to avoid.
>
> There we disagree. The hurt feelings of someone who attaches their identity
> to a text should not restrain our discourse.
>
>> Anyway, if it was a joke before, it isn't when somebody starts calling
>> some "group of people" "organised conspiracies to support and protect
>> child molesters".
>
> The group of people to whom that refers, the administrative hierarchy of
> the Catholic Church, have been doing exactly what the quotation says.
>
> I agree that's not a joke; it's a matter of fact, and relevant in the
> context where it was mentioned.
>
>> Is it OK to make fun of arbitrary ideas as "jokes"? I don't think so.
>
> Yes, a thousand times yes. Ideas are not people, have no rights, and get no
> exemption from criticism or dismissal or attack or ridicule.
>
>> It seems, again, hurtful. Especially when the idea is totally unrelated.
>
> That would eliminate just about every joke: a huge range of jokes *depend*
> for their humour on connecting seemingly-unrelated ideas. So by your logic,
> we don't get to make those jokes here.
>
>> It's like we're having a discussion about dynamic typing and somebody
>> blurts out "Hahaha, static typing is almost as dumb as Cartesian
>> Dualism". The best case outcome is that nobody cares. The worse case
>> outcomes go down to hurt feelings and flame wars from dualists.
>
> And the joke would still be okay, and it would be silly for anyone to take
> it as hurtful.
>
> You can call such a joke off-topic, and I'd agree. You can say it's not
> very funny, and I'd agree. You can say it's undeserving of a flame war, and
> I'd agree wholeheartedly.
>
> But whoever takes that joke and says it's deliberately hurtful is being
> presumptuous and censorious and unreasonable. If they then castigate the
> joker for supposedly hurting someone's feelings, it's at that point the
> atmosphere turns hostile to discussion.
>
> --
> ?\ ? ? ? ? ?The most dangerous man to any government is the man who is |
> ?`\ ? ? ? able to think things out for himself, without regard to the |
> _o__) ? ? ? ? ?prevailing superstitions and taboos.? ?Henry L. Mencken |
> Ben Finney <ben at benfinney.id.au>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From jeanpierreda at gmail.com  Thu Sep 29 19:07:28 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Thu, 29 Sep 2011 19:07:28 -0400
Subject: Suggested coding style
In-Reply-To: <db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
Message-ID: <CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>

> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)

Yeah. It's a much more difficult to read thing, but once you learn how
to write it it flows faster.

Of course, I never managed to learn how to write it...

I would suggest that rather than being "complicated" it is "dense".

> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.

May I suggest a email client that can group mailing list threads?
Also, not accusing others of conspiracies.

Devin

On Thu, Sep 29, 2011 at 6:56 PM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
>> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
>> > A specific method for padding a string with ONLY zeros is ludicrous
>> > and exposes the narrow mindedness of the creator. The only thing worse
>> > than "zfill" as a string method is making zfill into built-in
>> > function! The ONLY proper place for zfill is as an option in the
>> > str.format() method.
>>
>> > py> "{0:zf10}".format(1234) -> "00000000001234"
>>
>> Agree that zfill seems to be redundant with str.format, although your
>> suggested syntax is atrocious, especially since a syntax already
>> exists that fits better in the already-complicated format specifier
>> syntax.
>
> It's interesting that you find the format specifier "complicated". I
> will admit that upon first glance i lamented the new format method
> spec and attempted to cling to the old string interpolation crap.
> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)
>
> One thing that may help format noobs is to look at the spec as two
> parts; the part before the colon and the part after the colon. If you
> break it down in this manner the meaning starts to shine through. I
> will agree, it is a lot of cryptic info squeezed into a small space
> HOWEVER you would no want a verbose format specification.
>
> But i wholeheartedly agree with you points and i would say the zfill
> method has no future uses in the stdlib except for historical reasons.
> We should deprecate it now.
>
>
>> "{0:=010d}".format(1234) -> "0000001234"
>>
>> There are a couple of warts with the existing implementation, however:
>>
>> 1) str.zfill() operates on strings; the .format() syntax operates on
>> numeric types. ?I would suggest that the "=" fill alignment in format
>> specifiers should be extended to do the same thing as zfill when given
>> a string.
>
> EXACTLY!
>
> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From vacorama at gmail.com  Thu Sep 29 19:11:02 2011
From: vacorama at gmail.com (ron)
Date: Thu, 29 Sep 2011 16:11:02 -0700 (PDT)
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <0acaf956-3285-4d0c-98ea-61f7ce88a3ba@x19g2000vbl.googlegroups.com>

On Sep 29, 5:21?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> I have a Python script which I would like to test without a tty attached
> to the process. I could run it as a cron job, but is there an easier way?
>
> I am running Linux.
>
> --
> Steven

Have you tried GNU Screen?  It let's you run processes under virtual
terminals, which can then be backgrounded, reconnected to, etc.  I
think it comes with most linux distros.


From rosuav at gmail.com  Thu Sep 29 19:12:50 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 09:12:50 +1000
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJKDws8sv+9FkPHknQjabGCK-x7j=kZnLtrS+YV-Gx7DLQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<CABicbJKDws8sv+9FkPHknQjabGCK-x7j=kZnLtrS+YV-Gx7DLQ@mail.gmail.com>
Message-ID: <CAPTjJmq-XRSM9VXxOoQQ+GvDKZZpQdbB1+tyVxSV-6TG18YMoA@mail.gmail.com>

On Fri, Sep 30, 2011 at 9:03 AM, Devin Jeanpierre
<jeanpierreda at gmail.com> wrote:
> But anyway, no, we don't agree on what it means to be friendly or what
> a hostile atmosphere is. I've noticed that people tend to be a lot
> harsher here than what I'm used to, so perhaps your attitude to it is
> more common on mailing-lists and I should just adapt.
>

I'm told that there are other mailing lists / newsgroups that are far,
FAR more hostile than this. Haven't explored though, as I don't feel
like torturing myself :)

As to the original offensiveness, though: I'm a fundamentalist
Christian (not Catholic though), and I water-off-a-duck's-backed the
insult. If it's true, it's allowed to be offensive; if it's not true,
I can distance myself from it. (In this case, the latter; the inner
issues of the Catholic church are unconnected to the core of
Christianity.)

Chris Angelico


From ethan at stoneleaf.us  Thu Sep 29 19:21:25 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 29 Sep 2011 16:21:25 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <20110929220132.GD2715@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
Message-ID: <4E84FD75.5050907@stoneleaf.us>

Ben Finney wrote:
> But whoever takes that joke and says it's deliberately hurtful is being
> presumptuous and censorious and unreasonable. If they then castigate the
> joker for supposedly hurting someone's feelings, it's at that point the
> atmosphere turns hostile to discussion.

Um, wasn't it RantingRick who made this 'joke'?  Do you honestly believe 
he /wasn't/ trying to be offensive?

~Ethan~


From python at mrabarnett.plus.com  Thu Sep 29 19:37:08 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 30 Sep 2011 00:37:08 +0100
Subject: [OT] Benefit and belief
In-Reply-To: <4E84FD75.5050907@stoneleaf.us>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
Message-ID: <4E850124.8070508@mrabarnett.plus.com>

On 30/09/2011 00:21, Ethan Furman wrote:
> Ben Finney wrote:
>> But whoever takes that joke and says it's deliberately hurtful is being
>> presumptuous and censorious and unreasonable. If they then castigate the
>> joker for supposedly hurting someone's feelings, it's at that point the
>> atmosphere turns hostile to discussion.
>
> Um, wasn't it RantingRick who made this 'joke'? Do you honestly believe
> he /wasn't/ trying to be offensive?
>
rantingrick:
"""Since, like the bible the zen is self contradicting, any argument 
utilizing
the zen can be defeated utilizing the zen."""

alex23:
"""And like the Bible, the Zen was created by humans as a joke. If you're
taking it too seriously, that's your problem."""


From ethan at stoneleaf.us  Thu Sep 29 19:40:59 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 29 Sep 2011 16:40:59 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <4E84FD75.5050907@stoneleaf.us>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
Message-ID: <4E85020B.30207@stoneleaf.us>

Ethan Furman wrote:
> Ben Finney wrote:
>> But whoever takes that joke and says it's deliberately hurtful is being
>> presumptuous and censorious and unreasonable. If they then castigate the
>> joker for supposedly hurting someone's feelings, it's at that point the
>> atmosphere turns hostile to discussion.
> 
> Um, wasn't it RantingRick who made this 'joke'?  Do you honestly believe 
> he /wasn't/ trying to be offensive?

Okay, that's what I get for skimming -- it was alex23, not rr.  My 
apologies, rr, for the misattribution.

~Ethan~


From rantingrick at gmail.com  Thu Sep 29 19:41:34 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 16:41:34 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<mailman.1596.1317337691.27778.python-list@python.org>
Message-ID: <30b05df7-6f16-45fd-bbe8-7f6c09d2e6e1@i28g2000yqn.googlegroups.com>

On Sep 29, 6:07?pm, Devin Jeanpierre <jeanpierr... at gmail.com> wrote:
> > However, as you use the new format method you will come to appreciate
> > it. It's an adult beverage with an acquired taste. ;-)
>
> Yeah. It's a much more difficult to read thing, but once you learn how
> to write it it flows faster.
>
> Of course, I never managed to learn how to write it...

A good way to start out is to just use the positional arguments.

py> name = "Bob"

py> "Hello my name is {0}".format(name)
Hello my name is Bob

py> "Hello my name is {name}".format(name=name)
Hello my name is Bob

py> "Hello my name is {0}. My named spelled backwards is:
{0}".format(name)
Hello my name is Bob. My named spelled backwards is: Bob

py> "A small fry cost {0:0.2f}".format(1.6666666)
A small fry cost 1.67

py> "A small car cost {0:,.2f}".format(11666.6666)
A small car cost 11,666.67

# Python 2.7+ you can omit the index.
py> "{} = {}".format("value",2)
value = 2

Start with the small stuff and then diversify! You'll be glad you made
the change.


From rantingrick at gmail.com  Thu Sep 29 19:47:40 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 16:47:40 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
Message-ID: <1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>

On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
> > A specific method for padding a string with ONLY zeros is ludicrous
> > and exposes the narrow mindedness of the creator. The only thing worse
> > than "zfill" as a string method is making zfill into built-in
> > function! The ONLY proper place for zfill is as an option in the
> > str.format() method.
>
> > py> "{0:zf10}".format(1234) -> "00000000001234"
>
> Agree that zfill seems to be redundant with str.format, although your
> suggested syntax is atrocious, especially since a syntax already
> exists that fits better in the already-complicated format specifier
> syntax.
>
> "{0:=010d}".format(1234) -> "0000001234"
>
> There are a couple of warts with the existing implementation, however:
>
> 1) str.zfill() operates on strings; the .format() syntax operates on
> numeric types. ?I would suggest that the "=" fill alignment in format
> specifiers should be extended to do the same thing as zfill when given
> a string.

Ah ha! Found the answer!

py> "{0:010d}".format(1234)
0000001234

py> "{0:0>10}".format(1234)
0000001234

py> "{0:0>10}".format("1234")
0000001234

py> "{0:@>10}".format("1234")
@@@@@@1234

I would skip using the "{int}{repeat}d" syntax and just use the string
padding since you won't need to worry about the input data type. I
hate specificity types in string formats. With the old interpolation i
ALWAYS used %s for everything.


From rantingrick at gmail.com  Thu Sep 29 20:04:40 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 17:04:40 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1600.1317339708.27778.python-list@python.org>
Message-ID: <dee341b4-d2c0-42bf-825e-3e45b50c0c94@j1g2000yqj.googlegroups.com>

On Sep 29, 6:40?pm, Ethan Furman <et... at stoneleaf.us> wrote:
> Okay, that's what I get for skimming -- it was alex23, not rr. ?My
> apologies, rr, for the misattribution.

Oh don't worry Ethan, this is not the first time I've been falsely
accused, misquoted, and kicked in the testicles, and i'm quite sure
with this fine group of folks it won't be the last either.


From ben+python at benfinney.id.au  Thu Sep 29 22:06:56 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 12:06:56 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
Message-ID: <87bou23hrz.fsf@benfinney.id.au>

Westley Mart?nez <anikom15 at gmail.com> writes:

> I'm kind of new to the whole mailing list thing, but they seem to be a
> lot more lenient than internet forums about most things.

Note that a mailing list *is* an internet forum: it is a forum for
discussion, conducted on the internet. Mailing lists have been internet
forums long before any web application came along.

> I've noticed that sometimes Off-topic posts can get a little out of
> hand. I guess it's not really a big deal, but it bothers me, and the
> trolls just love to feed on it.

Yes, these are hazards of an unmoderated discussion forum like this. The
overall quality of discussion here, and the signal-to-noise ratio, makes
it very worthwhile I think.

> I mean, as programmers, we should devote our time to improving
> computer systems. On this mailing list, we're programmers, nothing
> else, and so we shouldn't mingle other things into the list.

What counts as ?mingle other things in?? What sparked this latest outcry
was a flippant remark at the expense of an ancient text and the Zen of
Python. That outcry was, I have argued, not reasonable.

I am firmly committed to allowing flippant remarks which are not at the
expense of people. It's highly inappropriate to ask that such remarks
not be made simply because some people might take undue offense.

Are they off-topic? Maybe, but there's no compulsion to respond to them
since flippant remarks, by definition, aren't meant seriously.

Are they not funny? That doesn't matter. If the obligation is that
people should not make unfunny jokes, we'd all be guilty.

Are they poking fun at something? That *definitely* shouldn't matter; if
a thing (not a person) is worth defending, then do so or not as you
choose. If you like it but can't defend it adequately, that's your
problem not anyone else's. If the ridicule works because it's true, then
the target thing is perhaps not worth defending.

We draw the line, IMO rightly so, at personal attacks on people or
groups of people. I have many times spoken out against those in this
forum. But books and ideas, no matter who likes them, are fair game for
flippant remarks in this and any forum, and I resist efforts to quash
such expression.

-- 
 \          ?What I have to do is see, at any rate, that I do not lend |
  `\      myself to the wrong which I condemn.? ?Henry Thoreau, _Civil |
_o__)                                                    Disobedience_ |
Ben Finney


From ben+python at benfinney.id.au  Thu Sep 29 22:10:16 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 12:10:16 +1000
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<0acaf956-3285-4d0c-98ea-61f7ce88a3ba@x19g2000vbl.googlegroups.com>
Message-ID: <877h4q3hmf.fsf@benfinney.id.au>

ron <vacorama at gmail.com> writes:

> On Sep 29, 5:21?am, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
> > I have a Python script which I would like to test without a tty attached
> > to the process. I could run it as a cron job, but is there an easier way?
>
> Have you tried GNU Screen?  It let's you run processes under virtual
> terminals, which can then be backgrounded, reconnected to, etc.  I
> think it comes with most linux distros.

That would not satisfy the ?without a TTY attached? requirement. GNU
Screen's main goal is to *provide* an attached TTY to multiple processes
when the TTY isn't interacting with the user.

I don't know whether Screen can *remove* a TTY from a process, and it
would be strange to me if it did so.

-- 
 \         ?I have yet to see any problem, however complicated, which, |
  `\      when you looked at it in the right way, did not become still |
_o__)                                more complicated.? ?Paul Anderson |
Ben Finney


From derek at simkowiak.net  Thu Sep 29 22:16:52 2011
From: derek at simkowiak.net (Derek Simkowiak)
Date: Thu, 29 Sep 2011 19:16:52 -0700
Subject: Motion Tracking with Python
Message-ID: <4E852694.4080303@simkowiak.net>

Hello,
I have a neat Python project I'd like to share. It does real-time motion 
tracking, using the Python bindings to the OpenCV library:

http://derek.simkowiak.net/motion-tracking-with-python/

There is a YouTube video showing the script in action.

It's especially neat because my daughter and I worked together on this 
project. We used it to track her two pet gerbils, as part of her science 
fair project. She wrote her own (separate) Python script to read the 
motion tracking log files, compute distance and velocity, and then 
export those values in a CSV file. Like I say on the web page: "I?m 
convinced that Python is the best language currently available for 
teaching kids how to program."

I also use Python professionally, and it's worked out great every time. 
There's no job Python can't handle.


Thanks,
Derek Simkowiak
http://derek.simkowiak.net



From steve+comp.lang.python at pearwood.info  Thu Sep 29 22:38:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 12:38:01 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
Message-ID: <4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>

Westley Mart?nez wrote:

> On this mailing list, we're programmers, nothing else, 

Speak for yourself.



-- 
Steven



From rosuav at gmail.com  Thu Sep 29 22:48:17 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 12:48:17 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmoxycEXE_x62gTa4-syGcp617O8GgNKXzJy4ksA_Xn3qA@mail.gmail.com>

On Fri, Sep 30, 2011 at 12:38 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Westley Mart?nez wrote:
>
>> On this mailing list, we're programmers, nothing else,
>
> Speak for yourself.
>

I don't think he meant that the populace here is exclusively
programmers, but that *on this list* we are here because we're
programmers. We may happen to have coincidental interest in (say)
music, but just because some group of us (or even all of us) all enjoy
music does not mean that it'd be on-topic to have a discussion of the
tetrachord of Mercury.

ChrisA


From wuwei23 at gmail.com  Thu Sep 29 22:50:27 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 19:50:27 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>

On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:
> What is so bad about breaking code in obscure places?

Try coding in PHP across minor release versions and see how you feel
about deprecating core functions on a whim.

> We changed print
> to a function which broke just about every piece of code every written
> in this language.

In a well declared _break_ with backwards compatibility. Not on a whim
between minor releases.

> (BTW, print should ALWAYS have been a function!)

Unfortunately, not everyone is as infallible as you. Or as
intractable. Coding styles change over time: this is a concept known
as "progress", although it's not as obvious in monocultures, so you
may not have heard of it.

> What is so bad then about breaking some very obscure code?

Because while you say "some very obscure code", what you really mean
is "code that isn't mine".

> GvR should be texting me every night in hopes that some of my API genius will rub
> off on him.

Are you off your medication again?

> I believe GvR had a "mid-dev-crisis"[...]

You seem to believe a lot of absolute garbage. As you have no access
to the inner states of _any_ of the people you regularly condemn here
with your hypocritical attacks, I've no idea why you consider yourself
to be an expert on their desires and opinions.



From wuwei23 at gmail.com  Thu Sep 29 23:05:26 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:05:26 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
Message-ID: <284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>

On Sep 30, 9:37?am, MRAB <pyt... at mrabarnett.plus.com> wrote:
> rantingrick:
> """Since, like the bible the zen is self contradicting, any argument
> utilizing
> the zen can be defeated utilizing the zen."""
>
> alex23:
> """And like the Bible, the Zen was created by humans as a joke. If you're
> taking it too seriously, that's your problem."""

Strangely, calling the bible self-contradictory wasn't seen as
inflammatory...

Seeing the quotes again, I'm pretty sure I was intending to be
flippant _in reference to rantrantrantrick's comment_. Given that it
was a response to someone else referring to the bible _and_ it made a
point about the zen, I'm not entirely sure why my comment was OT.

Again, if you want to disagree with my remark, knock yourself out. If
you want to take it as a personal attack, then there's nothing I can
do to stop you. But do realise that it is _you_ who is interpreting it
as such, and then recall the provision your very own Christ stated
about judging the actions of others: within your own belief system
_it's not your right to do so_.

That never seems to reduce the moral outrage though...


From steve+comp.lang.python at pearwood.info  Thu Sep 29 23:10:07 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 13:10:07 +1000
Subject: [OT] Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
Message-ID: <4e853310$0$29996$c3e8da3$5496439d@news.astraweb.com>

Devin Jeanpierre wrote:

> I also didn't reprimand anyone, except maybe Steven.

If you are more upset at my describing the Catholic Church as protecting
child molesters than you are at the Church for actually protecting child
molesters, then your priorities are completely screwed up and your
reprimand means less than nothing to me. I wear it as a badge of honour.


-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep 29 23:19:28 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 13:19:28 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
Message-ID: <4e853541$0$29997$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> On Fri, Sep 30, 2011 at 12:38 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> Westley Mart?nez wrote:
>>
>>> On this mailing list, we're programmers, nothing else,
>>
>> Speak for yourself.
>>
> 
> I don't think he meant that the populace here is exclusively
> programmers, but that *on this list* we are here because we're
> programmers. We may happen to have coincidental interest in (say)
> music, but just because some group of us (or even all of us) all enjoy
> music does not mean that it'd be on-topic to have a discussion of the
> tetrachord of Mercury.

I didn't say it would be on-topic. But we don't cease to be well-rounded
human beings with concerns beyond the narrow world of Python programming
just because we are writing on a programming forum.


-- 
Steven



From wuwei23 at gmail.com  Thu Sep 29 23:29:51 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:29:51 -0700 (PDT)
Subject: A Trivial Question
References: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
	<mailman.1542.1317247577.27778.python-list@python.org>
Message-ID: <65588c04-eea5-4a7a-b7ba-52dbcded227d@c1g2000yql.googlegroups.com>

On Sep 29, 8:06?am, Chris Rebert <c... at rebertia.com> wrote:
> Try this:
>
> def trial():
> ? ? class Foo(object):
> ? ? ? ? def __init__(self):
> ? ? ? ? ? ? print("Hello, world!")
> ? ? Foo()
> trial()

While this will display "Hello, world!" in the way required, with a
slight adjustment you end up with something potentially a little more
useful:

def trial():
    class Foo(object):
        def __init__(self):
            print("Hello, world!")
    return Foo()

myfoo = trial()

You'll see the same behaviour, but now myfoo refers to the Foo()
object that was created inside trial. This makes trial an object
factory. If you return an uninstantiated Foo instead:

def trial():
    class Foo(object):
        def __init__(self):
            print("Hello, world!")
    return Foo

MyFoo = trial()
foo = MyFoo()

Then trial is a class factory, creating and returning a class.
Factories can be handy if you're wanting to create dynamic classes
based on run time information.

def reader_factory(format='json'):
  class Reader(object):
    def __init__(self, file):
      self.file = file
    if format == 'json':
      def process(self):
        print 'json processing goes here'
    elif format == 'html':
      def process(self):
        print 'html processing goes here'
  return Reader

>>> JSONReader = reader_factory('json')
>>> j = JSONReader('file1')
>>> j.process()
json processing goes here

This is a trivial example which would probably be better handled by
subclasses, but is meant to be indicative of what's possible.


From rosuav at gmail.com  Thu Sep 29 23:41:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 13:41:31 +1000
Subject: Suggested coding style
In-Reply-To: <f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
Message-ID: <CAPTjJmrALWk-KYfKz3uXgewmzb584J4uU=sq_8Uw03bOrWj_Qw@mail.gmail.com>

On Fri, Sep 30, 2011 at 12:50 PM, alex23 <wuwei23 at gmail.com> wrote:
>> GvR should be texting me every night in hopes that some of my API genius will rub
>> off on him.
>
> Are you off your medication again?
>

He's very much like jimontrack (aka Tranzit Jim - google him if you're
curious), whose username people frequently referred to with the t
replaced with a c. Everyone thought he lived in April 1st.

ChrisA


From wuwei23 at gmail.com  Thu Sep 29 23:49:56 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:49:56 -0700 (PDT)
Subject: Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au> <4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
Message-ID: <5d04e455-3d9f-4727-bbe1-e7e22e3b27a0@i28g2000yqn.googlegroups.com>

Chris Angelico <ros... at gmail.com> wrote:
> We may happen to have coincidental interest in (say)
> music, but just because some group of us (or even all of us) all enjoy
> music does not mean that it'd be on-topic to have a discussion of the
> tetrachord of Mercury.

As general discussion it would be, sure, but I don't think there's
anything that can be readily dismissed as 'not relevant' in terms of
providing abstract concepts to programmers. I've tried explaining
encapsulation to non-programmers using Reason's hardware rack
metaphor. I'm slowly seeing more and more interest in applying
hermeneutics to computer science, a discipline that arose out of the
study of religious texts.

We don't always know what we don't know. For that alone, I'd rather we
were more inclusive of topics of discussion than exclusionary.


From wuwei23 at gmail.com  Thu Sep 29 23:57:56 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:57:56 -0700 (PDT)
Subject: Benefit and belief [was Re: Suggested coding style]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJKRaFyQbQ=EVBOE0YoOCmCTEXwh+t7W7f_uthbM-tY=cA@mail.gmail.com>
	<mailman.1555.1317274209.27778.python-list@python.org>
Message-ID: <4ba4842c-9043-4674-a0d5-5beb915e436b@k10g2000vbn.googlegroups.com>

Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> ? ? ? ? Well... We could try for equality in offense -- the Torah or the
> Koran? Maybe the Tripitaka or Sutras?

I always enjoyed the possibly apocryphal claim that the design of VRML
was influenced by the story of Indra's Net. Maybe some religious tomes
are just better? :)


From steve+comp.lang.python at pearwood.info  Fri Sep 30 00:34:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 14:34:26 +1000
Subject: Hermeneutics and computer science [was off-topic, now back on]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
	<5d04e455-3d9f-4727-bbe1-e7e22e3b27a0@i28g2000yqn.googlegroups.com>
Message-ID: <4e8546d3$0$29984$c3e8da3$5496439d@news.astraweb.com>

alex23 wrote:

> I'm slowly seeing more and more interest in applying
> a discipline that arose out of the
> study of religious texts.

Tell us more, please.



-- 
Steven



From ian.g.kelly at gmail.com  Fri Sep 30 00:36:29 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 22:36:29 -0600
Subject: Benefit and belief
In-Reply-To: <284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
Message-ID: <CALwzidkxkQYFj6+CYOzw27TG9jWN5md9GYqU7AM=2URuYR=G0w@mail.gmail.com>

On Thu, Sep 29, 2011 at 9:05 PM, alex23 <wuwei23 at gmail.com> wrote:
> Strangely, calling the bible self-contradictory wasn't seen as
> inflammatory...

Well, that part is factual.  Whether that makes it a joke is subjective.


From mickyhulse.lists at gmail.com  Fri Sep 30 00:48:30 2011
From: mickyhulse.lists at gmail.com (Micky Hulse)
Date: Thu, 29 Sep 2011 21:48:30 -0700
Subject: Motion Tracking with Python
In-Reply-To: <4E852694.4080303@simkowiak.net>
References: <4E852694.4080303@simkowiak.net>
Message-ID: <CALri7M=c=F2BUFmWu75tNDfOAvi_XUh7qFpm-prLp=NkpJVYtw@mail.gmail.com>

That's really cool! Thanks for sharing! :)


From ian.g.kelly at gmail.com  Fri Sep 30 00:49:43 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 22:49:43 -0600
Subject: Suggested coding style
In-Reply-To: <1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>
Message-ID: <CALwzidn0GUtsyPA2H0CzLp0YVhSdZgonn8qPRhzE=VSfB4j5UA@mail.gmail.com>

On Thu, Sep 29, 2011 at 5:47 PM, rantingrick <rantingrick at gmail.com> wrote:
> Ah ha! Found the answer!
>
> py> "{0:010d}".format(1234)
> 0000001234
>
> py> "{0:0>10}".format(1234)
> 0000001234
>
> py> "{0:0>10}".format("1234")
> 0000001234
>
> py> "{0:@>10}".format("1234")
> @@@@@@1234
>
> I would skip using the "{int}{repeat}d" syntax and just use the string
> padding since you won't need to worry about the input data type. I
> hate specificity types in string formats. With the old interpolation i
> ALWAYS used %s for everything.

Nope, that doesn't work.

>>> "{0:0>10}".format("-1234")
'00000-1234'

The whole point of zfill is that it handles signs correctly.


From colinphaedrus at yahoo.com  Fri Sep 30 01:02:48 2011
From: colinphaedrus at yahoo.com (crazycga)
Date: Fri, 30 Sep 2011 05:02:48 GMT
Subject: Motion Tracking with Python
References: <mailman.1603.1317355329.27778.python-list@python.org>
Message-ID: <Y3chq.31$kr4.2@newsfe03.iad>

On Thu, 29 Sep 2011 19:16:52 -0700, Derek Simkowiak wrote:

> Hello,
> I have a neat Python project I'd like to share. It does real-time motion
> tracking, using the Python bindings to the OpenCV library:
> 
> http://derek.simkowiak.net/motion-tracking-with-python/
> 
> There is a YouTube video showing the script in action.
> 
> It's especially neat because my daughter and I worked together on this
> project. We used it to track her two pet gerbils, as part of her science
> fair project. She wrote her own (separate) Python script to read the
> motion tracking log files, compute distance and velocity, and then
> export those values in a CSV file. Like I say on the web page: "I?m
> convinced that Python is the best language currently available for
> teaching kids how to program."
> 
> I also use Python professionally, and it's worked out great every time.
> There's no job Python can't handle.
> 
> 
> Thanks,
> Derek Simkowiak
> http://derek.simkowiak.net

That is excessively cool dude!  You've given me some inspiration for my 
own programming as a result!  Thank you!


From ian.g.kelly at gmail.com  Fri Sep 30 01:06:27 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 23:06:27 -0600
Subject: Suggested coding style
In-Reply-To: <db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
Message-ID: <CALwzidns6AYNTom4Wf7u9X6q9jQyksdqm5zboQa34EdaB8M0iA@mail.gmail.com>

On Thu, Sep 29, 2011 at 4:56 PM, rantingrick <rantingrick at gmail.com> wrote:
>> Agree that zfill seems to be redundant with str.format, although your
>> suggested syntax is atrocious, especially since a syntax already
>> exists that fits better in the already-complicated format specifier
>> syntax.
>
> It's interesting that you find the format specifier "complicated". I
> will admit that upon first glance i lamented the new format method
> spec and attempted to cling to the old string interpolation crap.
> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)

I find it interesting that a self-proclaimed API expert like yourself
suggests that it isn't complicated.  The documentation on the format
specifiers is around 6 1/2 printed pages long, and that's not even
including the docs for the string.Formatter API.  Devin is right,
though, in that a better word for it would be "dense".

"Complicated" is not a bad thing here, because with that complexity
comes expressiveness.  It just means that care needs to be taken when
adding new options to ensure that they integrate well with the
existing syntax.

> One thing that may help format noobs is to look at the spec as two
> parts; the part before the colon and the part after the colon. If you
> break it down in this manner the meaning starts to shine through. I
> will agree, it is a lot of cryptic info squeezed into a small space
> HOWEVER you would no want a verbose format specification.

What makes you think I'm a "format noob"?  The details may have
evolved over the years, but the format specifiers are fundamentally
still the same old printf syntax that we've all been using for
decades.


From ben+python at benfinney.id.au  Fri Sep 30 01:14:27 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 15:14:27 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
Message-ID: <8739fe393g.fsf@benfinney.id.au>

alex23 <wuwei23 at gmail.com> writes:

> On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:

> > GvR should be texting me every night in hopes that some of my API
> > genius will rub off on him.
>
> Are you off your medication again?

Please don't make personal attacks. If you don't feel like addressing
the content of his message, don't switch to implying he has a mental
illness.

-- 
 \         ?Pinky, are you pondering what I'm pondering?? ?I think so, |
  `\   Brain, but Tuesday Weld isn't a complete sentence.? ?_Pinky and |
_o__)                                                       The Brain_ |
Ben Finney


From ben+python at benfinney.id.au  Fri Sep 30 01:22:03 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 15:22:03 +1000
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJKRaFyQbQ=EVBOE0YoOCmCTEXwh+t7W7f_uthbM-tY=cA@mail.gmail.com>
	<mailman.1555.1317274209.27778.python-list@python.org>
	<4ba4842c-9043-4674-a0d5-5beb915e436b@k10g2000vbn.googlegroups.com>
Message-ID: <87y5x61u6c.fsf@benfinney.id.au>

alex23 <wuwei23 at gmail.com> writes:

> I always enjoyed the possibly apocryphal claim that the design of VRML
> was influenced by the story of Indra's Net.

You see, folks? It's by ?mingling in? other aspects of life with
technical discussion that we can improve the technical discussion :-)

> Maybe some religious tomes are just better? :)

They're all flawed, of course, as is any text. But some are wholly
dreadful while others have parts worth keeping.

-- 
 \         ?Nature hath given men one tongue but two ears, that we may |
  `\          hear from others twice as much as we speak.? ?Epictetus, |
_o__)                                                      _Fragments_ |
Ben Finney


From wuwei23 at gmail.com  Fri Sep 30 01:24:44 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 22:24:44 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
	<8739fe393g.fsf@benfinney.id.au>
Message-ID: <4b295504-3fbe-4d9a-b566-d12afad058c5@dd6g2000vbb.googlegroups.com>

On Sep 30, 3:14?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> alex23 <wuwe... at gmail.com> writes:
> > On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:
> > > GvR should be texting me every night in hopes that some of my API
> > > genius will rub off on him.
>
> > Are you off your medication again?
>
> Please don't make personal attacks. If you don't feel like addressing
> the content of his message, don't switch to implying he has a mental
> illness.

Fair enough. It was intended more as a ludicrous accusation to his
ridiculous claim. Lord knows there's enough in his posts to focus on
without the ad hominems :)


From rosuav at gmail.com  Fri Sep 30 01:31:24 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 15:31:24 +1000
Subject: Motion Tracking with Python
In-Reply-To: <4E852694.4080303@simkowiak.net>
References: <4E852694.4080303@simkowiak.net>
Message-ID: <CAPTjJmoZ7GwhTxC0TzVRBpMGoZcb9aDD0zR4n1NfH1j5zeToNQ@mail.gmail.com>

On Fri, Sep 30, 2011 at 12:16 PM, Derek Simkowiak <derek at simkowiak.net> wrote:
> Like I say on the web page: "I?m convinced that Python is the best language
> currently available for teaching kids how to program."

Agreed.

> There's no job Python can't handle.

Ehhh... Not agreed. Not quite. Yes it's true in that Python is
Turing-complete, but there are a lot of jobs that it can't handle
_well_. (Unless someone's seriously considering porting the Linux
kernel to Python... or writing a device driver in Python... or writing
a MS Word virus in Python...) Right tool for the job! But certainly
Python is excellent at many tasks, and it's easy to work with. I
wholeheartedly support the sentiment behind your statement, even if I
quibble slightly - your statement has accuracy, it merely wants
precision :)

I'll watch your vid once I'm home from work - it promises to be some
pretty cool stuff!

ChrisA


From wuwei23 at gmail.com  Fri Sep 30 01:54:43 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 22:54:43 -0700 (PDT)
Subject: Hermeneutics and computer science [was off-topic, now back on]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au> <4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
	<5d04e455-3d9f-4727-bbe1-e7e22e3b27a0@i28g2000yqn.googlegroups.com>
	<4e8546d3$0$29984$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <1e8a3553-75fb-45cc-ab71-998a5406fbcd@m37g2000yqc.googlegroups.com>

On Sep 30, 2:34?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> alex23 wrote:
> > I'm slowly seeing more and more interest in applying
> > a discipline that arose out of the
> > study of religious texts.
>
> Tell us more, please.

Well, it's mostly from real world discussions and may actually be an
artefact of my holding degrees in both philosophy & computer
science :)  But googling "hermeneutics computer science" does bring up
a heap of entries, although the highest ranked is from 1979, so I may
have oversold the idea of it being a growing interest.

Amazon also shows that there have been a number of publications
dealing with this:
http://www.amazon.com/s?ie=UTF8&keywords=Hermeneutics.&rh=n%3A3508%2Ck%3AHermeneutics.

For me, the main aspect of hermeneutics that could apply here - to
programming especially - is the concept that reading a text informs
you for subsequently reinterpreting the text (the "hermeneutic circle"
of Heidegger). No philosophical notion of truth is needed to explain
this, I see much in common with iterative development processes.
Multiplicity of perspective is similarly important in interpretation:
again, computer systems are developed with many user roles and thus
many 'views' of what is happening.

In the interest of fair play, if anyone still smarting at my flippancy
wants to take a swing at my belief system, it's mostly cobbled
together from Nietzsche, Wittgenstein & Crowley. Personal email
preferably, let's keep it off the list unless its particularly witty :)


From thebiggestbangtheory at gmail.com  Fri Sep 30 02:02:55 2011
From: thebiggestbangtheory at gmail.com (bingbang)
Date: Thu, 29 Sep 2011 23:02:55 -0700 (PDT)
Subject: Modifying external running process using python
Message-ID: <086bd803-ddc5-4913-b1f1-5fb6cb5848bb@i28g2000yqn.googlegroups.com>

Hi all,

Beginner here. I am trying to figure out how to modify a running
process on a linux system using Python.

Example: I have a python program that takes in as an argument a PID.
My goal is to use this PID and get info about the running process with
that PID. (1) Find where it is located in memory (2) Where is the
instruction pointer (3) Modify the program such that the next executed
instruction is something else (4) Return the pointer back to the next
legitimate instruction (5) Let the original process execute as it
should have

I am trying to develop a POC to show how a small piece of code can be
injected into a running process to just print 'hello' to stdout and
not disturb the rest of the process. Before you tear you hair out. The
program I want to "infect" will be an infinite loop with a sleep in it
and the "malware" will be a " print 'infected' " kind of program. Not
looking to do anything malicious, just trying to learn.

I looked up trace and some other modules but they all seem to do with
following the currently executing python process. Also looked at
pyhook, but its mainly to trap signals from keyboards etc.. Looked at
gray hat python - tuned towards windows.

Can anyone please point me to some modules that might be useful, or
some code samples. I tried googling for "python inspect process PID"
etc.. did not get anything very useful. I know I can run gdb -a pid
from within python and such but I am looking for a non os.popen ish
kind of a way. Is there a module that will be helpful.

Let's assume I have sudo/root privileges and that the POC code "only
needs to work in linux".

Any help is very appreciated.
[Also posted on StackOverflow] - no real good leads from there

Thanks!


From anikom15 at gmail.com  Fri Sep 30 02:14:21 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 23:14:21 -0700
Subject: Suggested coding style
In-Reply-To: <CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
Message-ID: <20110930061421.GA12929@Smoke>

On Thu, Sep 29, 2011 at 07:07:28PM -0400, Devin Jeanpierre wrote:
> > However, as you use the new format method you will come to appreciate
> > it. It's an adult beverage with an acquired taste. ;-)
> 
> Yeah. It's a much more difficult to read thing, but once you learn how
> to write it it flows faster.
> 
> Of course, I never managed to learn how to write it...
> 
> I would suggest that rather than being "complicated" it is "dense".
> 
I'm one of the weirdos who is absolutely hostile to the format method
and continues to use % formatting.  I'm pretty sure it is because of my
C background (actually I learned Python before C, and thus learned %
formatting in Python).  However, I'm not so opposed to it that I've not
learned it.  It is quite "dense", almost feels like something in a
scripting language like Perl.  Indeed, I did try it for some time, but
it was just too "heavy" and slow for me.  Well someday I'll probably be
forced to use it, but for anyone else who agrees with me, always know
there's at least one Python programmer out there with some (or no)
sense.


From wuwei23 at gmail.com  Fri Sep 30 02:31:50 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 23:31:50 -0700 (PDT)
Subject: Motion Tracking with Python
References: <mailman.1603.1317355329.27778.python-list@python.org>
Message-ID: <75e59668-9002-4614-9fe8-9605e6ecf924@dm9g2000vbb.googlegroups.com>

On Sep 30, 12:16?pm, Derek Simkowiak <de... at simkowiak.net> wrote:
> It's especially neat because my daughter and I worked together on this
> project. We used it to track her two pet gerbils, as part of her science
> fair project. She wrote her own (separate) Python script to read the
> motion tracking log files, compute distance and velocity, and then
> export those values in a CSV file.

Thank you for sharing this. My daughter is only 20 months at the
moment but I definitely hope to teach her coding as she gets older.

Cheers.


From rosuav at gmail.com  Fri Sep 30 02:35:02 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 16:35:02 +1000
Subject: Suggested coding style
In-Reply-To: <20110930061421.GA12929@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<20110930061421.GA12929@Smoke>
Message-ID: <CAPTjJmoNF0Vw0KuECyaTR72_TC_FednvEkzw80-35cT7_SatLg@mail.gmail.com>

On Fri, Sep 30, 2011 at 4:14 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> I'm one of the weirdos who is absolutely hostile to the format method
> and continues to use % formatting. ?I'm pretty sure it is because of my
> C background (actually I learned Python before C, and thus learned %
> formatting in Python).

I quite like printf-style formatting. It's well known, well defined,
and compact. When I write C++ programs, I often still use
printf/sprintf extensively - it just "feels nicer" than iostream (and
the main downside of printf, the lack of argument checking, is largely
solved in recent gcc). So when I work with Python, it makes sense to
use the same thing there. Dense syntax results in easy-to-read format
strings, imho.

ChrisA


From wuwei23 at gmail.com  Fri Sep 30 02:39:29 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 23:39:29 -0700 (PDT)
Subject: Motion Tracking with Python
References: <4E852694.4080303@simkowiak.net>
	<mailman.1608.1317360687.27778.python-list@python.org>
Message-ID: <a3946135-6f74-4b32-862b-8ca0410f3c15@18g2000yqz.googlegroups.com>

On Sep 30, 3:31?pm, Chris Angelico <ros... at gmail.com> wrote:
> Unless someone's seriously considering porting the Linux
> kernel to Python...

Well, they've certainly asked:
http://bytes.com/topic/python/answers/37048-reimplenting-linux-kernel-python

And while not Linux kernels, there are two projects attempting to
develop Python-implemented OSes:
http://code.google.com/p/cleese/
http://unununium.org

> or writing a device driver in Python...

http://www.stealth-x.com/programming/driver-writing-with-python.php

> or writing a MS Word virus in Python...

Now that's just crazy talk.


From subhagurgaon2011 at gmail.com  Fri Sep 30 02:43:13 2011
From: subhagurgaon2011 at gmail.com (Subhabrata Banerjee)
Date: Thu, 29 Sep 2011 23:43:13 -0700 (PDT)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
	<CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>
	<mailman.1586.1317326003.27778.python-list@python.org>
Message-ID: <f68e3dda-4666-4bce-8e08-f263c4fd4079@z19g2000vby.googlegroups.com>

On Sep 30, 12:52?am, "Prasad, Ramit" <ramit.pra... at jpmorgan.com>
wrote:
> -----Original Message-----
> From: python-list-bounces+ramit.prasad=jpmorgan.... at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.... at python.org] On Behalf Of Chris Angelico
> Sent: Thursday, September 29, 2011 11:51 AM
> To: python-l... at python.org
> Subject: Re: Question on Manipulating List and on Python
>
> On Fri, Sep 30, 2011 at 2:36 AM, Subhabrata Banerjee
> <subhagurgaon2... at gmail.com> wrote:
> > And Python seems faster than C++/Java. It is indeed. I also experience
> > it.
>
> Python compared to Java? Difficult to compare. Python to C++?
> Impossible to compare. But performance depends MASSIVELY on
> algorithmic quality; if you code the exact same thing in Python and in
> C++, you would probably find that the C++ one is faster, but chances
> are you're implementing approximately the same thing in two quite
> different ways. Or possibly you're using a slow and inefficient
> library or third-party function.
>
> I've sometimes written code in one language and directly ported it to
> another, and then run both on the same hardware. With most such
> experiments, CPython generally doesn't perform all that well, and C or
> C++ rocks. But frequently, the C/C++ code is more verbose and more
> error-prone than the Python - because Python's biggest boast is not
> that it's fast, but that it's *fast enough*, while being easy to work
> with. (And every once in a while there's something where I want to use
> a pointer to some other variable, and that's a concept that just plain
> doesn't work in Python. You have references to objects, but you can't
> from one place change another variable, without using some kind of
> mutable object that they both reference.)
> -----------------------------------------------------------------------
>
> I think Steven D'Aprano had an excellent post on this a week or so ago (on the tutor list, not this one).
>
> See:http://mail.python.org/pipermail/tutor/2011-September/085573.html
>
> Ramit
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
> ChrisA
> --http://mail.python.org/mailman/listinfo/python-list
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available athttp://www.jpmorgan.com/pages/disclosures/email. ?
>
>

Dear Group,
Thanks for your suggestions. I'll check if these work. Converting to
dictionary I was thinking but others I have to test. Without patting
my own back(I do not write algorithms that good), I can say Python is
indeed damn fast. A reason many of my friends are shifting fast to
Python and I was suggested by a reputed person of MIT CogLab to use
Python instead of C++ and it worked just fabulous for me. To my
collegue I would find out an answer.
Regards,
Subhabrata.


From rustompmody at gmail.com  Fri Sep 30 03:24:30 2011
From: rustompmody at gmail.com (rusi)
Date: Fri, 30 Sep 2011 00:24:30 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
Message-ID: <73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>

On Sep 30, 4:03?am, Devin Jeanpierre <jeanpierr... at gmail.com> wrote:
>
> But anyway, no, we don't agree on what it means to be friendly or what
> a hostile atmosphere is. I've noticed that people tend to be a lot
> harsher here than what I'm used to, so perhaps your attitude to it is
> more common on mailing-lists and I should just adapt.

A Mulla Nasruddin story comes to mind:
The judge in a village court had gone on vacation. Nasrudin was asked
to be temporary judge for a day. Mulla sat on the Judge's chair and
ordered the first case to be brought up for hearing.

"You are right," said Nasrudin after carefully hearing one side.
"You are right," he said after carefully hearing the other side.
"But both cannot be right!" said the court clerk bewildered.
After profound thought said the Mulla:

  "You are right"


From rosuav at gmail.com  Fri Sep 30 03:52:42 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 17:52:42 +1000
Subject: Benefit and belief
In-Reply-To: <73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
	<73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>
Message-ID: <CAPTjJmq=h5Cwe4tTYaumNOGp8EcQF_nKOgP81FfUjz5OCbLd9g@mail.gmail.com>

On Fri, Sep 30, 2011 at 5:24 PM, rusi <rustompmody at gmail.com> wrote:
> "You are right," said Nasrudin after carefully hearing one side.
> "You are right," he said after carefully hearing the other side.
> "But both cannot be right!" said the court clerk bewildered.
> After profound thought said the Mulla:
>
> ?"You are right"
>

And I am right, and you are right, and all is right as right can be!
-- Pish-Tush, a Japanese nobleman in service of /The Mikado/

Chris Angelico


From rosuav at gmail.com  Fri Sep 30 03:57:12 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 17:57:12 +1000
Subject: Motion Tracking with Python
In-Reply-To: <a3946135-6f74-4b32-862b-8ca0410f3c15@18g2000yqz.googlegroups.com>
References: <4E852694.4080303@simkowiak.net>
	<mailman.1608.1317360687.27778.python-list@python.org>
	<a3946135-6f74-4b32-862b-8ca0410f3c15@18g2000yqz.googlegroups.com>
Message-ID: <CAPTjJmrtqhGt55o0dYFGA26E2t_ri5AvzVjs+aswDX_AA1admA@mail.gmail.com>

On Fri, Sep 30, 2011 at 4:39 PM, alex23 <wuwei23 at gmail.com> wrote:
>> or writing a MS Word virus in Python...
>
> Now that's just crazy talk.
>

... and I thought all three were. You know what they say - truth is
stranger than fiction, because fiction has to make sense!

Although the device driver example you cite is still ring-3 code, and
the Linux kernel is still in C. I like the idea of a special OS
written in Python though; it wouldn't be Linux, but it could well be
an excellent embedded-device OS. It'd probably end up having to
reinvent all sorts of facilities like process isolation and such,
though.

ChrisA


From ovidiudeac at gmail.com  Fri Sep 30 05:10:48 2011
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 30 Sep 2011 12:10:48 +0300
Subject: regexp compilation error
Message-ID: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>

I have the following regexp which fails to compile. Can somebody explain why?

>>> re.compile(r"""^(?: [^y]* )*""", re.X)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/re.py", line 190, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python2.6/re.py", line 245, in _compile
    raise error, v # invalid expression
sre_constants.error: nothing to repeat

Is this a bug or a feature?

Thanks,
Ovidiu


From moky.math at gmail.com  Fri Sep 30 05:13:14 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Fri, 30 Sep 2011 11:13:14 +0200
Subject: Counting the number of call of a function
In-Reply-To: <mailman.1577.1317317181.27778.python-list@python.org>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
	<mailman.1577.1317317181.27778.python-list@python.org>
Message-ID: <4E85882A.6010602@gmail.com>


> The keys of globals() are the _names_. You're giving it the function
> itself.

Ow, ok. I didn't caught it. I understand now.

  > A decorator would be better.

Yes. I keep the solution with
foo=Wraper(foo)

Thanks a lot all !
Laurent



From moky.math at gmail.com  Fri Sep 30 05:13:14 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Fri, 30 Sep 2011 11:13:14 +0200
Subject: Counting the number of call of a function
In-Reply-To: <mailman.1577.1317317181.27778.python-list@python.org>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
	<mailman.1577.1317317181.27778.python-list@python.org>
Message-ID: <4E85882A.6010602@gmail.com>


> The keys of globals() are the _names_. You're giving it the function
> itself.

Ow, ok. I didn't caught it. I understand now.

  > A decorator would be better.

Yes. I keep the solution with
foo=Wraper(foo)

Thanks a lot all !
Laurent



From rosuav at gmail.com  Fri Sep 30 05:18:43 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 19:18:43 +1000
Subject: regexp compilation error
In-Reply-To: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
Message-ID: <CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>

On Fri, Sep 30, 2011 at 7:10 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
> I have the following regexp which fails to compile. Can somebody explain why?
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "/usr/lib/python2.6/re.py", line 190, in compile
> ? ?return _compile(pattern, flags)
> ?File "/usr/lib/python2.6/re.py", line 245, in _compile
> ? ?raise error, v # invalid expression
> sre_constants.error: nothing to repeat
>
> Is this a bug or a feature?

What version of Python are you using? It looks like you're running in
a Python 3 interpreter, and loading a Python 2 module (as shown by the
python2.6 in the path and the Python 2 error-raise syntax). You may
have a problem with your module path.

Running that line of code in Python 3.2 for Windows produces this error:

>>> re.compile(r"""^(?: [^y]* )*""", re.X)
Traceback (most recent call last):
  File "<pyshell#465>", line 1, in <module>
    re.compile(r"""^(?: [^y]* )*""", re.X)
  File "C:\Python32\lib\re.py", line 206, in compile
    return _compile(pattern, flags)
  File "C:\Python32\lib\re.py", line 256, in _compile
    return _compile_typed(type(pattern), pattern, flags)
  File "C:\Python32\lib\functools.py", line 180, in wrapper
    result = user_function(*args, **kwds)
  File "C:\Python32\lib\re.py", line 268, in _compile_typed
    return sre_compile.compile(pattern, flags)
  File "C:\Python32\lib\sre_compile.py", line 495, in compile
    code = _code(p, flags)
  File "C:\Python32\lib\sre_compile.py", line 480, in _code
    _compile(code, p.data, flags)
  File "C:\Python32\lib\sre_compile.py", line 74, in _compile
    elif _simple(av) and op is not REPEAT:
  File "C:\Python32\lib\sre_compile.py", line 359, in _simple
    raise error("nothing to repeat")
sre_constants.error: nothing to repeat

Does that help at all?

ChrisA


From ovidiudeac at gmail.com  Fri Sep 30 05:26:52 2011
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 30 Sep 2011 12:26:52 +0300
Subject: regexp compilation error
In-Reply-To: <CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
Message-ID: <CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>

$ python --version
Python 2.6.6


On Fri, Sep 30, 2011 at 12:18 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 7:10 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
>> I have the following regexp which fails to compile. Can somebody explain why?
>>
>>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
>> Traceback (most recent call last):
>> ?File "<stdin>", line 1, in <module>
>> ?File "/usr/lib/python2.6/re.py", line 190, in compile
>> ? ?return _compile(pattern, flags)
>> ?File "/usr/lib/python2.6/re.py", line 245, in _compile
>> ? ?raise error, v # invalid expression
>> sre_constants.error: nothing to repeat
>>
>> Is this a bug or a feature?
>
> What version of Python are you using? It looks like you're running in
> a Python 3 interpreter, and loading a Python 2 module (as shown by the
> python2.6 in the path and the Python 2 error-raise syntax). You may
> have a problem with your module path.
>
> Running that line of code in Python 3.2 for Windows produces this error:
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
> ?File "<pyshell#465>", line 1, in <module>
> ? ?re.compile(r"""^(?: [^y]* )*""", re.X)
> ?File "C:\Python32\lib\re.py", line 206, in compile
> ? ?return _compile(pattern, flags)
> ?File "C:\Python32\lib\re.py", line 256, in _compile
> ? ?return _compile_typed(type(pattern), pattern, flags)
> ?File "C:\Python32\lib\functools.py", line 180, in wrapper
> ? ?result = user_function(*args, **kwds)
> ?File "C:\Python32\lib\re.py", line 268, in _compile_typed
> ? ?return sre_compile.compile(pattern, flags)
> ?File "C:\Python32\lib\sre_compile.py", line 495, in compile
> ? ?code = _code(p, flags)
> ?File "C:\Python32\lib\sre_compile.py", line 480, in _code
> ? ?_compile(code, p.data, flags)
> ?File "C:\Python32\lib\sre_compile.py", line 74, in _compile
> ? ?elif _simple(av) and op is not REPEAT:
> ?File "C:\Python32\lib\sre_compile.py", line 359, in _simple
> ? ?raise error("nothing to repeat")
> sre_constants.error: nothing to repeat
>
> Does that help at all?
>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rosuav at gmail.com  Fri Sep 30 05:29:50 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 19:29:50 +1000
Subject: regexp compilation error
In-Reply-To: <CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
Message-ID: <CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>

On Fri, Sep 30, 2011 at 7:26 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
> $ python --version
> Python 2.6.6

Ah, I think I was misinterpreting the traceback. You do actually have
a useful message there; it's the same error that my Py3.2 produced:

sre_constants.error: nothing to repeat

I'm not sure what your regex is trying to do, but the problem seems to
be connected with the * at the end of the pattern.

ChrisA


From 1248283536 at qq.com  Fri Sep 30 05:35:37 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Fri, 30 Sep 2011 17:35:37 +0800
Subject: =?gbk?B?u9i4tKO6IGhvdyB0byBydW4gaW4geHA/?=
Message-ID: <tencent_1A00B2D755E0E2994EFC8D6D@qq.com>

the command :
2to3-3.2 getcode3.py -w
can run in linux
it can't run in window xp,can i make it in window xp?
 
 
------------------ ???? ------------------
???: "1248283536"<1248283536 at qq.com>;
????: 2011?9?28?(???) ??7:50
???: "Peter Otten"<__peter__ at web.de>; "python-list"<python-list at python.org>; 

??: Re: how to run in xp?

 

 it can run ,but there is still a problem ,nothing in my file.
please run the code in xp+python32
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    url='http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    print (file)
what you get is:

>>> 
b''
b''
b''
>>> 

how to fix it?
------------------ Original ------------------
From:  "Peter Otten"<__peter__ at web.de>;
Date:  Wed, Sep 28, 2011 04:04 PM
To:  "python-list"<python-list at python.org>; 

Subject:  Re: how to run in xp?

 
=?gbk?B?ytjW6rT9zcM=?= wrote:

> #coding:utf-8
> import urllib
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies- \ 
>     by-industry.aspx?exchange='+down+'&render=download'
>     file=urllib.urlopen(url).read() myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> it can run in ubuntu+python2.6 ,when it run in window xp+python32,the
> output is Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 8, in <module>
>     file=urllib.urlopen(url).read()
> AttributeError: 'module' object has no attribute 'urlopen'
> 
> i change it into:
> #coding:utf-8
> import urllib.request
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> the output is :
> Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 9, in <module>
>     myfile.write(file)
> TypeError: must be str, not bytes
> 
> how to make it run in xp+python32?

The problem here is the switch from Python 2 to 3. Python 3 has some 
backwards-incompatible Syntax changes along with changes to classes and 
library organisation. The good news is that there's a tool, 2to3, that can 
handle most of these changes:

$ cat getcode.py
#coding:utf-8   
import urllib   
exchange=['NASDAQ','NYSE','AMEX'] 
for down in exchange:             
    myfile=open('./'+down,'wb')   
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download' 
    file=urllib.urlopen(url).read()                                                                    
    myfile.write(file)                                                                                 
    print 'ok', down
    myfile.close()
$ cp getcode.py getcode3.py
$ 2to3-3.2 getcode3.py -w
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
RefactoringTool: Refactored getcode3.py
--- getcode3.py (original)
+++ getcode3.py (refactored)
@@ -1,10 +1,10 @@
 #coding:utf-8
-import urllib
+import urllib.request, urllib.parse, urllib.error
 exchange=['NASDAQ','NYSE','AMEX']
 for down in exchange:
     myfile=open('./'+down,'wb')
     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
-    file=urllib.urlopen(url).read()
+    file=urllib.request.urlopen(url).read()
     myfile.write(file)
-    print 'ok', down
+    print('ok', down)
     myfile.close()
RefactoringTool: Files that were modified:
RefactoringTool: getcode3.py
$ cat getcode3.py
#coding:utf-8
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'wb')
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print('ok', down)
    myfile.close()
$ python3.2 getcode3.py
ok NASDAQ
ok NYSE
ok AMEX


-- 
http://mail.python.org/mailman/listinfo/python-list
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From ovidiudeac at gmail.com  Fri Sep 30 05:57:25 2011
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 30 Sep 2011 12:57:25 +0300
Subject: regexp compilation error
In-Reply-To: <CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
	<CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
Message-ID: <CAKVsE7teYVhts07Nj4jWWcv-XS4fv92wqgGfB7Dg86nNXBSNFA@mail.gmail.com>

This is only part of a regex taken from an old perl application which
we are trying to understand/port to our new Python implementation.

The original regex was considerably more complex and it didn't compile
in python so I removed all the parts I could in order to isolate the
problem such that I can ask help here.

So the problem is that this regex doesn't compile. On the other hand
I'm not really sure it should. It's an anchor on which you apply *.
I'm not sure if this is legal.

On the other hand if I remove one of the * it compiles.

>>> re.compile(r"""^(?: [^y]* )*""", re.X)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/re.py", line 190, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python2.6/re.py", line 245, in _compile
    raise error, v # invalid expression
sre_constants.error: nothing to repeat
>>> re.compile(r"""^(?: [^y] )*""", re.X)
<_sre.SRE_Pattern object at 0x7f4069cc36b0>
>>> re.compile(r"""^(?: [^y]* )""", re.X)
<_sre.SRE_Pattern object at 0x7f4069cc3730>

Is this a bug in python regex engine? Or maybe some incompatibility with Perl?

On Fri, Sep 30, 2011 at 12:29 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 7:26 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
>> $ python --version
>> Python 2.6.6
>
> Ah, I think I was misinterpreting the traceback. You do actually have
> a useful message there; it's the same error that my Py3.2 produced:
>
> sre_constants.error: nothing to repeat
>
> I'm not sure what your regex is trying to do, but the problem seems to
> be connected with the * at the end of the pattern.
>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve+comp.lang.python at pearwood.info  Fri Sep 30 08:06:43 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 22:06:43 +1000
Subject: regexp compilation error
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
	<CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
	<mailman.1619.1317376649.27778.python-list@python.org>
Message-ID: <4e85b0d3$0$29975$c3e8da3$5496439d@news.astraweb.com>

Ovidiu Deac wrote:

>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.6/re.py", line 190, in compile
>     return _compile(pattern, flags)
>   File "/usr/lib/python2.6/re.py", line 245, in _compile
>     raise error, v # invalid expression
> sre_constants.error: nothing to repeat
>>>> re.compile(r"""^(?: [^y] )*""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc36b0>
>>>> re.compile(r"""^(?: [^y]* )""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc3730>
> 
> Is this a bug in python regex engine? Or maybe some incompatibility with
> Perl?

Before asking whether it is a bug, perhaps you should consider what (if
anything) that regex is supposed to actually do.

Perhaps you should post the Perl equivalent, and some examples of it in use.


-- 
Steven



From hansmu at xs4all.nl  Fri Sep 30 08:12:12 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Fri, 30 Sep 2011 14:12:12 +0200
Subject: regexp compilation error
In-Reply-To: <mailman.1613.1317373851.27778.python-list@python.org>
References: <mailman.1613.1317373851.27778.python-list@python.org>
Message-ID: <4e85b21c$0$2444$e4fe514c@news2.news.xs4all.nl>

On 30/09/11 11:10:48, Ovidiu Deac wrote:
> I have the following regexp which fails to compile. Can somebody explain why?
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
[...]
> sre_constants.error: nothing to repeat
>
> Is this a bug or a feature?

A feature: the message explains why this pattern is not allowed.

The sub-pattern (?: [^y]* ) matches zero or more non-'y's, so
it potentially matches the empty string.  It you were allowed
to apply '*' to such a sub-pattern, the matcher could go into
an infinite loop, finding billions of matching empty strings,
one after the other.

I'm not sure what you are trying to match, but for zero-or-more
not-'y's, you could write r"^[^y]*".  This is guaranteed to
always match, since there are always at least zero of them.

You might as well write r"^", that is also guaranteed to
always match.

What are you trying to achieve?

-- HansM




From neilc at norwich.edu  Fri Sep 30 08:15:33 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 30 Sep 2011 12:15:33 GMT
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
	<73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>
	<mailman.1611.1317369165.27778.python-list@python.org>
Message-ID: <9elq75Fh5cU1@mid.individual.net>

On 2011-09-30, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 5:24 PM, rusi <rustompmody at gmail.com> wrote:
>> "You are right," said Nasrudin after carefully hearing one side.
>> "You are right," he said after carefully hearing the other side.
>> "But both cannot be right!" said the court clerk bewildered.
>> After profound thought said the Mulla:
>>
>> ?"You are right"
>>
>
> And I am right, and you are right, and all is right as right can be!
> -- Pish-Tush, a Japanese nobleman in service of /The Mikado/

Never has being right, proper and correct been so thoroughly
celebrated. Except perhaps when my C++ program compiles without
warnings. That's pretty good, too.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From 1248283536 at qq.com  Fri Sep 30 08:36:57 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Fri, 30 Sep 2011 20:36:57 +0800
Subject: parse  xml
Message-ID: <tencent_3FDC10142817A6FA2A1CD410@qq.com>

please click the 
http://www.secinfo.com/d14qfp.q9j.htm
then ,click  the following:
44: XML   IDEA: Condensed Consolidating Statements of Income   XML   5.11M   (Details)--R158 
there is the  citigroup's annual financial report --statements of income,xml file.

how can i get a  table of  statements of income  in python ?
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From jeanpierreda at gmail.com  Fri Sep 30 08:40:33 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Fri, 30 Sep 2011 08:40:33 -0400
Subject: [OT] Benefit and belief
In-Reply-To: <4e853310$0$29996$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
	<4e853310$0$29996$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJL1xFdrX3qhWHxmRDa6JXs9K-0HJt8PZ1DhrPy6RbVODw@mail.gmail.com>

> If you are more upset at my describing the Catholic Church as protecting
> child molesters than you are at the Church for actually protecting child
> molesters

I'm not, and your rhetoric is ridiculous.

Devin

On Thu, Sep 29, 2011 at 11:10 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Devin Jeanpierre wrote:
>
>> I also didn't reprimand anyone, except maybe Steven.
>
> If you are more upset at my describing the Catholic Church as protecting
> child molesters than you are at the Church for actually protecting child
> molesters, then your priorities are completely screwed up and your
> reprimand means less than nothing to me. I wear it as a badge of honour.
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rantingrick at gmail.com  Fri Sep 30 09:54:25 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 06:54:25 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <27620bc4-edd2-473e-809f-18f17b426b4f@db5g2000vbb.googlegroups.com>

Note: I am quoting "Passiday" to get this thread back on subject
however my reply is for "alex23" the philosopher"

On Sep 29, 9:50?pm, alex23 <wuwe... at gmail.com> wrote:
> On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:
>
> > What is so bad about breaking code in obscure places?
>
> Try coding in PHP across minor release versions and see how you feel
> about deprecating core functions on a whim.

I never said we should remove it now, i said we should deprecate it
now.

> > We changed print
> > to a function which broke just about every piece of code every written
> > in this language.
>
> In a well declared _break_ with backwards compatibility. Not on a whim
> between minor releases.

Please Google deprecate.

> > What is so bad then about breaking some very obscure code?
>
> Because while you say "some very obscure code", what you really mean
> is "code that isn't mine".

Well "alex" i can't see a mob approaching with pitchforks because we
deprecate a misplaced and rarely used functionality of the stdlib.

> As you have no access
> to the inner states of _any_ of the people you regularly condemn here
> with your hypocritical attacks, I've no idea why you consider yourself
> to be an expert on their desires and opinions.

Well "alex", like yourself, i hold expertise in many fields BESIDES
programming. One of which being psychology.


From vlastimil.brom at gmail.com  Fri Sep 30 09:56:20 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 30 Sep 2011 15:56:20 +0200
Subject: regexp compilation error
In-Reply-To: <CAKVsE7teYVhts07Nj4jWWcv-XS4fv92wqgGfB7Dg86nNXBSNFA@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
	<CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
	<CAKVsE7teYVhts07Nj4jWWcv-XS4fv92wqgGfB7Dg86nNXBSNFA@mail.gmail.com>
Message-ID: <CAHzaPEMVfBjWjh9FxOtatpONBguYjMnceipSTZuSi3za2-gu=w@mail.gmail.com>

2011/9/30 Ovidiu Deac <ovidiudeac at gmail.com>:
> This is only part of a regex taken from an old perl application which
> we are trying to understand/port to our new Python implementation.
>
> The original regex was considerably more complex and it didn't compile
> in python so I removed all the parts I could in order to isolate the
> problem such that I can ask help here.
>
> So the problem is that this regex doesn't compile. On the other hand
> I'm not really sure it should. It's an anchor on which you apply *.
> I'm not sure if this is legal.
>
> On the other hand if I remove one of the * it compiles.
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "/usr/lib/python2.6/re.py", line 190, in compile
> ? ?return _compile(pattern, flags)
> ?File "/usr/lib/python2.6/re.py", line 245, in _compile
> ? ?raise error, v # invalid expression
> sre_constants.error: nothing to repeat
>>>> re.compile(r"""^(?: [^y] )*""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc36b0>
>>>> re.compile(r"""^(?: [^y]* )""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc3730>
>
> Is this a bug in python regex engine? Or maybe some incompatibility with Perl?
>
> On Fri, Sep 30, 2011 at 12:29 PM, Chris Angelico <rosuav at gmail.com> wrote:
>> On Fri, Sep 30, 2011 at 7:26 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
>>> $ python --version
>>> Python 2.6.6
>>
>> Ah, I think I was misinterpreting the traceback. You do actually have
>> a useful message there; it's the same error that my Py3.2 produced:
>>
>> sre_constants.error: nothing to repeat
>>
>> I'm not sure what your regex is trying to do, but the problem seems to
>> be connected with the * at the end of the pattern.
>>
>> ChrisA
>> --

I believe, this is a limitation of the builtin re engine concerning
nested infinite quantifiers - (...*)*  - in your pattern.
You can try a more powerful recent regex implementation, which appears
to handle it:

http://pypi.python.org/pypi/regex

using the VERBOSE flag - re.X all (unescaped) whitespace outside of
character classes is ignored,
http://docs.python.org/library/re.html#re.VERBOSE
the pattern should be equivalent to:
r"^(?:[^y]*)*"
ie. you are not actually gaining anything with double quantifier, as
there isn't anything "real" in the pattern outside [^y]*

It appears, that you have oversimplified the pattern (if it had worked
in the original app),
however, you may simply try with
import regex as re
and see, if it helps.

Cf:
>>>
>>> regex.findall(r"""^(?: [^y]* )*""", "a bcd e", re.X)
['a bcd e']
>>> re.findall(r"""^(?: [^y]* )*""", "a bcd e", re.X)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "re.pyc", line 177, in findall
  File "re.pyc", line 244, in _compile
error: nothing to repeat
>>>
>>> re.findall(r"^(?:[^y]*)*", "a bcd e")
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "re.pyc", line 177, in findall
  File "re.pyc", line 244, in _compile
error: nothing to repeat
>>> regex.findall(r"^(?:[^y]*)*", "a bcd e")
['a bcd e']
>>> regex.findall(r"^[^y]*", "a bcd e")
['a bcd e']
>>>


hth,
  vbr


From devplayer at gmail.com  Fri Sep 30 09:57:17 2011
From: devplayer at gmail.com (DevPlayer)
Date: Fri, 30 Sep 2011 06:57:17 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<mailman.1566.1317305041.27778.python-list@python.org>
	<87mxdn2fwl.fsf@benfinney.id.au>
Message-ID: <60c608a5-5f56-4949-806f-f68ff2510fb0@j1g2000yqj.googlegroups.com>

from attitude import humour

Funny. url link to gif. Funny. Youtube video. Funny.

True Pythonees do not speak in English they speak in Python.

Shame, this discussion will be sent to the Pearly gates or the Flaming
Iron Bars in 5 days. Well, not so much a shame.



From rantingrick at gmail.com  Fri Sep 30 09:58:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 06:58:36 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
Message-ID: <6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>

On Sep 29, 10:05?pm, alex23 <wuwe... at gmail.com> wrote:
> On Sep 30, 9:37?am, MRAB <pyt... at mrabarnett.plus.com> wrote:

> > alex23:
> > """And like the Bible, the Zen was created by humans as a joke. If you're
> > taking it too seriously, that's your problem."""
>
> Strangely, calling the bible self-contradictory wasn't seen as
> inflammatory...

For the same reason that telling the truth is not slander. The fact is
that the Bible IS contradictory with itself. However, your opinion
unlike my facts, were full of vile hatred. Nice try attempting to
shift the mob against me.





From rick.mansilla at gmail.com  Fri Sep 30 10:06:42 2011
From: rick.mansilla at gmail.com (Ricardo Mansilla)
Date: Fri, 30 Sep 2011 09:06:42 -0500
Subject: Motion Tracking with Python
In-Reply-To: <4E852694.4080303@simkowiak.net>
References: <4E852694.4080303@simkowiak.net>
Message-ID: <201109300906.43128.rick.mansilla@gmail.com>

On Thursday 29 September 2011 21:16:52 you wrote:
> Hello,
> I have a neat Python project I'd like to share. It does real-time motion
> tracking, using the Python bindings to the OpenCV library:
> 
> http://derek.simkowiak.net/motion-tracking-with-python/
> 
> There is a YouTube video showing the script in action.
> 
> It's especially neat because my daughter and I worked together on this
> project. We used it to track her two pet gerbils, as part of her science
> fair project. She wrote her own (separate) Python script to read the
> motion tracking log files, compute distance and velocity, and then
> export those values in a CSV file. Like I say on the web page: "I?m
> convinced that Python is the best language currently available for
> teaching kids how to program."
> 
> I also use Python professionally, and it's worked out great every time.
> There's no job Python can't handle.
> 
> 
> Thanks,
> Derek Simkowiak
> http://derek.simkowiak.net

Hi, this is awesome!!
 I'm currently working in something similar, but I am having problems with 
getting data from the CCD (basically i don't know how to do it :), can you 
give me a tip for doing this? Or explain how you did it please?
I not a newbie at python but not as experienced as evidently you are.
Thanks a lot in advance.

-- 
(...)Also, since that same law states that any system able to prove its 
consistency to itself must be inconsistent; any mind that believes it can 
prove its own sanity is, therefore, insane.(...) 
Kurt G?del. 
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From rantingrick at gmail.com  Fri Sep 30 10:19:20 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 07:19:20 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>
	<mailman.1606.1317358215.27778.python-list@python.org>
Message-ID: <7d5a7284-6f73-42f7-9386-14cb5e6e69b2@z8g2000yqb.googlegroups.com>

On Sep 29, 11:49?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> Nope, that doesn't work.
>
> >>> "{0:0>10}".format("-1234")
>
> '00000-1234'
>
> The whole point of zfill is that it handles signs correctly.

py> "{0:-010d}".format(-1234)
'-000001234'

My point was: Use the {char}{repeat}d format for integers and the
{char}{<|>|=}{repeat} for strings. Problem solved. No more need for
zfill.

py> "{0:0>10}".format(-1234)
'00000-1234'

What result would you expect from that string argument? I think it
behaves as anyone would expect. If you have a str and you want it
interpreted as a negative integer then cast it.

py> "{0:010d}".format(int("-1234"))
'-000001234'

If you would like for the spec to handle the case of integers and
strings transparently then you need to lobby to have the API changed.
Maybe they could add a !i like the !s and !r which would be explicit.
However, i don't think implicit coercion of strings to integers is a
good idea. Using the int function or !i removes and ambiguities.

For me, the spec works just fine as is.


From rosuav at gmail.com  Fri Sep 30 10:43:15 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 00:43:15 +1000
Subject: Suggested coding style
In-Reply-To: <27620bc4-edd2-473e-809f-18f17b426b4f@db5g2000vbb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<27620bc4-edd2-473e-809f-18f17b426b4f@db5g2000vbb.googlegroups.com>
Message-ID: <CAPTjJmqMb=-Dv6T2=a3WZ85x=OvP1V1ktMMUCMQ5QuQswDgjhA@mail.gmail.com>

On Fri, Sep 30, 2011 at 11:54 PM, rantingrick <rantingrick at gmail.com> wrote:
> Well "alex", like yourself, i hold expertise in many fields BESIDES
> programming. One of which being psychology.
>

I *knew* it! We're all part of a huge experiment to see how much the
human psyche can withstand. If we succeed on the Rick test, do we
"level up" and get a second troll to deal with, or is this MST3K-style
eternity?

ChrisA


From devplayer at gmail.com  Fri Sep 30 10:59:27 2011
From: devplayer at gmail.com (DevPlayer)
Date: Fri, 30 Sep 2011 07:59:27 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
Message-ID: <c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>

I still assert that contradiction is caused by narrow perspective.

By that I mean: just because an objects scope may not see a certain
condition, doesn't mean that condition is non-existant.

I also propose that just because something seems to contradict doesn't
mean it is false. Take for instance:

Look out your window. Is it daylight or night time? You may say it is
daylight or you may say it is night time. I would disagree that only
one of those conditions are true. Both conditions are true. Always. It
is only day (or night) for YOU. But the opposite DOES in fact exist on
the other side of the world at the same time.

I call this Duality of Nature (and I believe there was some religion
somewhere in some time that has the same notion, Budism I think but I
could be mistaken). I see such "contradictions" in what appears to be
most truths.

If I am correct; not sure here; but I think that is part of the new
math Choas theory. (The notion that not all variables are known and
the results of well defined functions may result in completely
different actual outcomes) [Missing variables in such data sets and
functions, to me is basically a narrow(er) perspective of the all the
revelent factors for such computations.]

You could think of this in terms of classes and attributes if you
want. Just because an object does not see an attribute, like "has_
connection", doesn't mean the app doesn't have a connection to the
server, just that that object doesn't have access to the existance of
that attribute, because it is not in scope (ie narrow perspective).

I propose that if something seems to contradict itself, that that
doesnt' invalidate its value outright. It -could- invalidate its
value, but doesn't guarentee no value.

How this matters to coding style? No connection visible. It's just a
proposed notion.


From breamoreboy at yahoo.co.uk  Fri Sep 30 11:51:37 2011
From: breamoreboy at yahoo.co.uk (Blockheads Oi Oi)
Date: Fri, 30 Sep 2011 08:51:37 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<42df7e77-44ab-405e-9c60-8f394e3e5628@d17g2000yqa.googlegroups.com>
Message-ID: <9b034444-a387-4f73-9c0c-08c159cd3017@dm9g2000vbb.googlegroups.com>

On Sep 29, 2:59?am, rantingrick <rantingr... at gmail.com> wrote:
> On Sep 27, 11:25?pm, Steven D'Aprano <steve
>
> +comp.lang.pyt... at pearwood.info> wrote:
> > The Python development team is relatively small and chronically busy: too
> > much to do and not enough time to do it.
>
> If that is the case then why do they snub their noses at anyone who
> wishes to help? What kind of people would chase off good help just to
> save ego? I imagine the folks at py dev sort of like a dying man in
> need of a heart transplant; the man informs the doctor that he would
> happy to get a transplant but not if the heart came from a jew, asian,
> african, latin, russian, or canuck.

For the uninitiated, rr is to Python what King Herod was to baby
sitting. (With apologies to Tommy Docherty)


From neilc at norwich.edu  Fri Sep 30 11:58:24 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 30 Sep 2011 15:58:24 GMT
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
Message-ID: <9em790Fnj9U1@mid.individual.net>

On 2011-09-30, DevPlayer <devplayer at gmail.com> wrote:
> I still assert that contradiction is caused by narrow perspective.
>
> By that I mean: just because an objects scope may not see a certain
> condition, doesn't mean that condition is non-existant.
>
> I also propose that just because something seems to contradict doesn't
> mean it is false. Take for instance:
>
> Look out your window. Is it daylight or night time? You may say
> it is daylight or you may say it is night time. I would
> disagree that only one of those conditions are true. Both
> conditions are true. Always. It is only day (or night) for YOU.
> But the opposite DOES in fact exist on the other side of the
> world at the same time.
> 
> I call this Duality of Nature (and I believe there was some
> religion somewhere in some time that has the same notion,
> Budism I think but I could be mistaken). I see such
> "contradictions" in what appears to be most truths.

You are not alone. Many ancient philosophers, fathers of
religious and scientific thought, thought the same.

They thought that contradictory qualities could exist in objects
simultaneously. For example, they thought that a cat was both big
and small, because it was big compared to a mouse and small
compared to a house. They didn't notice that big and small were
not poperties of the cat, at all but were instead statements
about how a cat relates to another object.

When you say, "It is night," you are making an assertion about a
position on the surface of the earth and its relationship to the
sun.

If you are not discussing a specific a position on the Earth,
then you cannot make a meaningful assertion about night or day at
all. Night and Day are not qualities of the entire Earth, but
only of positions on the Earth.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From ramit.prasad at jpmorgan.com  Fri Sep 30 12:06:19 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 12:06:19 -0400
Subject: Suggested coding style
In-Reply-To: <CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>

>May I suggest a[n] email client that can group mailing list threads?

Please do. Bonus points if it handles threading in a Gmail-like style.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Devin Jeanpierre
Sent: Thursday, September 29, 2011 6:07 PM
To: rantingrick
Cc: python-list at python.org
Subject: Re: Suggested coding style

> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)

Yeah. It's a much more difficult to read thing, but once you learn how
to write it it flows faster.

Of course, I never managed to learn how to write it...

I would suggest that rather than being "complicated" it is "dense".

> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.

Devin

On Thu, Sep 29, 2011 at 6:56 PM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
>> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
>> > A specific method for padding a string with ONLY zeros is ludicrous
>> > and exposes the narrow mindedness of the creator. The only thing worse
>> > than "zfill" as a string method is making zfill into built-in
>> > function! The ONLY proper place for zfill is as an option in the
>> > str.format() method.
>>
>> > py> "{0:zf10}".format(1234) -> "00000000001234"
>>
>> Agree that zfill seems to be redundant with str.format, although your
>> suggested syntax is atrocious, especially since a syntax already
>> exists that fits better in the already-complicated format specifier
>> syntax.
>
> It's interesting that you find the format specifier "complicated". I
> will admit that upon first glance i lamented the new format method
> spec and attempted to cling to the old string interpolation crap.
> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)
>
> One thing that may help format noobs is to look at the spec as two
> parts; the part before the colon and the part after the colon. If you
> break it down in this manner the meaning starts to shine through. I
> will agree, it is a lot of cryptic info squeezed into a small space
> HOWEVER you would no want a verbose format specification.
>
> But i wholeheartedly agree with you points and i would say the zfill
> method has no future uses in the stdlib except for historical reasons.
> We should deprecate it now.
>
>
>> "{0:=010d}".format(1234) -> "0000001234"
>>
>> There are a couple of warts with the existing implementation, however:
>>
>> 1) str.zfill() operates on strings; the .format() syntax operates on
>> numeric types. ?I would suggest that the "=" fill alignment in format
>> specifiers should be extended to do the same thing as zfill when given
>> a string.
>
> EXACTLY!
>
> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-- 
http://mail.python.org/mailman/listinfo/python-list

This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From rustompmody at gmail.com  Fri Sep 30 12:22:59 2011
From: rustompmody at gmail.com (rusi)
Date: Fri, 30 Sep 2011 09:22:59 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
Message-ID: <55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>

On Sep 30, 8:58?pm, Neil Cerutti <ne... at norwich.edu> wrote:
> On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
>
>
>
> > I still assert that contradiction is caused by narrow perspective.
>
> > By that I mean: just because an objects scope may not see a certain
> > condition, doesn't mean that condition is non-existant.
>
> > I also propose that just because something seems to contradict doesn't
> > mean it is false. Take for instance:
>
> > Look out your window. Is it daylight or night time? You may say
> > it is daylight or you may say it is night time. I would
> > disagree that only one of those conditions are true. Both
> > conditions are true. Always. It is only day (or night) for YOU.
> > But the opposite DOES in fact exist on the other side of the
> > world at the same time.
>
> > I call this Duality of Nature (and I believe there was some
> > religion somewhere in some time that has the same notion,
> > Budism I think but I could be mistaken). I see such
> > "contradictions" in what appears to be most truths.
>
> You are not alone. Many ancient philosophers, fathers of
> religious and scientific thought, thought the same.
>
> They thought that contradictory qualities could exist in objects
> simultaneously. For example, they thought that a cat was both big
> and small, because it was big compared to a mouse and small
> compared to a house. They didn't notice that big and small were
> not poperties of the cat, at all but were instead statements
> about how a cat relates to another object.
>
> When you say, "It is night," you are making an assertion about a
> position on the surface of the earth and its relationship to the
> sun.
>
> If you are not discussing a specific a position on the Earth,
> then you cannot make a meaningful assertion about night or day at
> all. Night and Day are not qualities of the entire Earth, but
> only of positions on the Earth.

But just imagine that we were all pre-galiliean savages -- knowing
nothing about the roundness of the earth, the earth going round and so
on and somehow you and I get on the phone and we start arguing:
Rusi: Its 9:30 pm
Neil: No its 12 noon

How many cases are there?
We both may be right, I may be wrong (my watch may have stopped) or we
both etc

ie conflicting data may get resolved within a larger world view (which
is what devplayer is probably saying).

Until then it is wiser to assume that that larger world view exists
(and I dont yet know it)
than to assume that since I dont know it it does not exist.

For me (admittedly an oriental) such agnosticism (literally "I-do-not-
know-ness") is as much a foundation for true religiosity as effective
science.


From anikom15 at gmail.com  Fri Sep 30 12:36:38 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Fri, 30 Sep 2011 09:36:38 -0700
Subject: Benefit and belief
In-Reply-To: <55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
	<55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
Message-ID: <20110930163638.GA13519@Smoke>

On Fri, Sep 30, 2011 at 09:22:59AM -0700, rusi wrote:
> On Sep 30, 8:58?pm, Neil Cerutti <ne... at norwich.edu> wrote:
> > On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
> >
> >
> >
> > > I still assert that contradiction is caused by narrow perspective.
> >
> > > By that I mean: just because an objects scope may not see a certain
> > > condition, doesn't mean that condition is non-existant.
> >
> > > I also propose that just because something seems to contradict doesn't
> > > mean it is false. Take for instance:
> >
> > > Look out your window. Is it daylight or night time? You may say
> > > it is daylight or you may say it is night time. I would
> > > disagree that only one of those conditions are true. Both
> > > conditions are true. Always. It is only day (or night) for YOU.
> > > But the opposite DOES in fact exist on the other side of the
> > > world at the same time.
> >
> > > I call this Duality of Nature (and I believe there was some
> > > religion somewhere in some time that has the same notion,
> > > Budism I think but I could be mistaken). I see such
> > > "contradictions" in what appears to be most truths.
> >
> > You are not alone. Many ancient philosophers, fathers of
> > religious and scientific thought, thought the same.
> >
> > They thought that contradictory qualities could exist in objects
> > simultaneously. For example, they thought that a cat was both big
> > and small, because it was big compared to a mouse and small
> > compared to a house. They didn't notice that big and small were
> > not poperties of the cat, at all but were instead statements
> > about how a cat relates to another object.
> >
> > When you say, "It is night," you are making an assertion about a
> > position on the surface of the earth and its relationship to the
> > sun.
> >
> > If you are not discussing a specific a position on the Earth,
> > then you cannot make a meaningful assertion about night or day at
> > all. Night and Day are not qualities of the entire Earth, but
> > only of positions on the Earth.
> 
> But just imagine that we were all pre-galiliean savages -- knowing
> nothing about the roundness of the earth, the earth going round and so
> on and somehow you and I get on the phone and we start arguing:
> Rusi: Its 9:30 pm
> Neil: No its 12 noon
> 
> How many cases are there?
> We both may be right, I may be wrong (my watch may have stopped) or we
> both etc
> 
> ie conflicting data may get resolved within a larger world view (which
> is what devplayer is probably saying).
> 
> Until then it is wiser to assume that that larger world view exists
> (and I dont yet know it)
> than to assume that since I dont know it it does not exist.
> 
> For me (admittedly an oriental) such agnosticism (literally "I-do-not-
> know-ness") is as much a foundation for true religiosity as effective
> science

I.e. humility?


From irmen.NOSPAM at xs4all.nl  Fri Sep 30 12:40:32 2011
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Fri, 30 Sep 2011 18:40:32 +0200
Subject: Motion Tracking with Python
In-Reply-To: <mailman.1603.1317355329.27778.python-list@python.org>
References: <mailman.1603.1317355329.27778.python-list@python.org>
Message-ID: <4e85f0ff$0$2529$e4fe514c@news2.news.xs4all.nl>

On 30-9-2011 4:16, Derek Simkowiak wrote:
> Hello,
> I have a neat Python project I'd like to share. It does real-time motion tracking, using
> the Python bindings to the OpenCV library:
> 
> http://derek.simkowiak.net/motion-tracking-with-python/
> 
> There is a YouTube video showing the script in action.
> 
> It's especially neat because my daughter and I worked together on this project. We used
> it to track her two pet gerbils, as part of her science fair project. She wrote her own
> (separate) Python script to read the motion tracking log files, compute distance and
> velocity, and then export those values in a CSV file. Like I say on the web page: "I?m
> convinced that Python is the best language currently available for teaching kids how to
> program."

Wow. Very impressive and very enjoyable to read about it. How was her project received
at school?

Thanks a lot for sharing this.

Irmen de Jong


From ladasky at my-deja.com  Fri Sep 30 12:40:46 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Fri, 30 Sep 2011 09:40:46 -0700 (PDT)
Subject: Simplest way to resize an image-like array
Message-ID: <fb126bd8-7b71-4e61-b44d-95848c591d97@t11g2000yqa.googlegroups.com>

Hi folks,

I have 500 x 500 arrays of floats, representing 2D "grayscale" images,
that I need to resample at a lower spatial resolution, say, 120 x 120
(details to follow, if you feel they are relevant).

I've got the numpy, and scipy, and matplotlib. All of these packages
hint at the fact that they have the capability to resample an image-
like array.  But after reading the documentation for all of these
packages, none of them make it straightforward, which surprises me.
For example, there are several spline and interpolation methods in
scipy.interpolate.  They seem to return interpolator classes rather
than arrays.  Is there no simple method which then calls the
interpolator, and builds the resampled array?

Yes, I can do this myself if I must -- but over the years, I've come
to learn that a lot of the code I want is already written, and that
sometimes I just have to know where to look for it.

Thanks!


From rosuav at gmail.com  Fri Sep 30 12:41:30 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 02:41:30 +1000
Subject: Benefit and belief
In-Reply-To: <j64r9v$v63$1@dough.gmane.org>
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<j64r9v$v63$1@dough.gmane.org>
Message-ID: <CAPTjJmqDxZ2bx6CKfqQOoNHre7L0+ZBJQeDiy6u24Nj9xhY9Yw@mail.gmail.com>

On Sat, Oct 1, 2011 at 2:38 AM, Dennis Lee Bieber <wlfraed at ix.netcom.com> wrote:
> ? ? ? ?And I would argue that by starting with "Look out your window..."
> you have explicitly excluded the rest of the world from consideration in
> answering; you have narrowed the focus to only the region visible from
> "my window".
>

But what if I'm a great windowing magnate, owning windows all over the world?

(Is anyone else amused by this thread and its ridiculosity?)

ChrisA


From rustompmody at gmail.com  Fri Sep 30 12:49:21 2011
From: rustompmody at gmail.com (rusi)
Date: Fri, 30 Sep 2011 09:49:21 -0700 (PDT)
Subject: Benefit and belief
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<j64r9v$v63$1@dough.gmane.org>
	<mailman.1630.1317400892.27778.python-list@python.org>
Message-ID: <e27fa9f0-c989-4d6c-94cd-b6857371fd8b@m5g2000vbe.googlegroups.com>

On Sep 30, 9:41?pm, Chris Angelico <ros... at gmail.com> wrote:
> On Sat, Oct 1, 2011 at 2:38 AM, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
>
> > ? ? ? ?And I would argue that by starting with "Look out your window..."
> > you have explicitly excluded the rest of the world from consideration in
> > answering; you have narrowed the focus to only the region visible from
> > "my window".
>
> But what if I'm a great windowing magnate, owning windows all over the world?
>
> (Is anyone else amused by this thread and its ridiculosity?)
>
> ChrisA

Not more ridiculous than people getting religious over not just about
silly (man-made) languages but even over the editors they use <wink>


From ramit.prasad at jpmorgan.com  Fri Sep 30 12:56:46 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 12:56:46 -0400
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <4e853541$0$29997$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
	<4e853541$0$29997$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677B6@EMARC112VS01.exchad.jpmchase.net>

>I didn't say it would be on-topic. But we don't cease to be well-rounded
>human beings with concerns beyond the narrow world of Python programming
>just because we are writing on a programming forum.

Everything is on topic to programmers! To (mis)quote Sheldon Cooper: "I'm a [programmer]. I have a working knowledge of the entire universe and everything it contains."

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423





This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From rosuav at gmail.com  Fri Sep 30 12:59:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 02:59:31 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>

On Sat, Oct 1, 2011 at 2:06 AM, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>May I suggest a[n] email client that can group mailing list threads?
>
> Please do. Bonus points if it handles threading in a Gmail-like style.
>

May I suggest Gmail? It handles threading in a very Gmail-like style.

ChrisA
running and ducking


From ramit.prasad at jpmorgan.com  Fri Sep 30 13:05:27 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 13:05:27 -0400
Subject: Suggested coding style
In-Reply-To: <CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
	<CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>

>> Please do. Bonus points if it handles threading in a Gmail-like style.
>>
>
>May I suggest Gmail? It handles threading in a very Gmail-like style.

Curses, foiled by my lack of specificity! I meant desktop client. Although...if another website does similar threading it would be good to know. Never know when I will want to start avoiding Gmail :)

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ethan at stoneleaf.us  Fri Sep 30 13:10:32 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 30 Sep 2011 10:10:32 -0700
Subject: Benefit and belief
In-Reply-To: <e27fa9f0-c989-4d6c-94cd-b6857371fd8b@m5g2000vbe.googlegroups.com>
References: <87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>	<mailman.1599.1317339426.27778.python-list@python.org>	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>	<j64r9v$v63$1@dough.gmane.org>	<mailman.1630.1317400892.27778.python-list@python.org>
	<e27fa9f0-c989-4d6c-94cd-b6857371fd8b@m5g2000vbe.googlegroups.com>
Message-ID: <4E85F808.9040100@stoneleaf.us>

rusi wrote:
> On Sep 30, 9:41 pm, Chris Angelico <ros... at gmail.com> wrote:
>> On Sat, Oct 1, 2011 at 2:38 AM, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
>>
>>>        And I would argue that by starting with "Look out your window..."
>>> you have explicitly excluded the rest of the world from consideration in
>>> answering; you have narrowed the focus to only the region visible from
>>> "my window".
>> But what if I'm a great windowing magnate, owning windows all over the world?
>>
>> (Is anyone else amused by this thread and its ridiculosity?)
>>
>> ChrisA
> 
> Not more ridiculous than people getting religious over not just about
> silly (man-made) languages but even over the editors they use <wink>

No kidding!  Vim is *obviously* the best one out there!  *ducks and runs*

~Ethan~


From paul.nospam at rudin.co.uk  Fri Sep 30 13:11:36 2011
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Fri, 30 Sep 2011 18:11:36 +0100
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
Message-ID: <871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>

"Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:

>>May I suggest a[n] email client that can group mailing list threads?
>
> Please do. Bonus points if it handles threading in a Gmail-like style.

The answer to any news/mail client with feature X type question is
normally "gnus" - although I don't know what "Gmail-like style" is.


From rosuav at gmail.com  Fri Sep 30 13:12:02 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 03:12:02 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
	<CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPTjJmqKDyv9ZMu8jo+xShtHBz2-7DUV-p=DNP7gywXPbGLMzA@mail.gmail.com>

On Sat, Oct 1, 2011 at 3:05 AM, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
> Curses, foiled by my lack of specificity! I meant desktop client. Although...if another website does similar threading it would be good to know. Never know when I will want to start avoiding Gmail :)
>

Ah, *desktop* client! Hm. I actually can't advise there; since I'm
constantly mobile, I use webmail for everything - installed Squirrel
Mail and RoundCube on my server for remote access. Neither does
threading though afaik; nor does PMMail (which is a desktop client).

ChrisA


From neilc at norwich.edu  Fri Sep 30 13:12:26 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 30 Sep 2011 17:12:26 GMT
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
Message-ID: <9embjqFb8uU1@mid.individual.net>

On 2011-09-30, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
> "Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:
>
>>>May I suggest a[n] email client that can group mailing list threads?
>>
>> Please do. Bonus points if it handles threading in a Gmail-like style.
>
> The answer to any news/mail client with feature X type question is
> normally "gnus" - although I don't know what "Gmail-like style" is.

slrn. Is good.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From alec.taylor6 at gmail.com  Fri Sep 30 13:19:20 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 1 Oct 2011 03:19:20 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
	<CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAO+9iGdGiK0O8OeqHd4KogC7B7Cw75oLb+wX=ZUmQn+9PD2BFQ@mail.gmail.com>

Maybe one Apache's Buzz?

On 10/1/11, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>> Please do. Bonus points if it handles threading in a Gmail-like style.
>>>
>>
>>May I suggest Gmail? It handles threading in a very Gmail-like style.
>
> Curses, foiled by my lack of specificity! I meant desktop client.
> Although...if another website does similar threading it would be good to
> know. Never know when I will want to start avoiding Gmail :)
>
> Ramit
>
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available at http://www.jpmorgan.com/pages/disclosures/email.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From alec.taylor6 at gmail.com  Fri Sep 30 13:26:00 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 1 Oct 2011 03:26:00 +1000
Subject: Suggested coding style
In-Reply-To: <9embjqFb8uU1@mid.individual.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
Message-ID: <CAO+9iGcuodGt_GSuVORJr3h5uOChPDk_nuAhZpp61=oekt8YXw@mail.gmail.com>

http://incubator.apache.org/wave/

On 10/1/11, Neil Cerutti <neilc at norwich.edu> wrote:
> On 2011-09-30, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
>> "Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:
>>
>>>>May I suggest a[n] email client that can group mailing list threads?
>>>
>>> Please do. Bonus points if it handles threading in a Gmail-like style.
>>
>> The answer to any news/mail client with feature X type question is
>> normally "gnus" - although I don't know what "Gmail-like style" is.
>
> slrn. Is good.
>
> --
> Neil Cerutti
> "A politician is an arse upon which everyone has sat except a man."
>   e. e. cummings
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ramit.prasad at jpmorgan.com  Fri Sep 30 13:45:21 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 13:45:21 -0400
Subject: Suggested coding style
In-Reply-To: <9embjqFb8uU1@mid.individual.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>

>>>>May I suggest a[n] email client that can group mailing list threads?

> The answer to any news/mail client with feature X type question is
> normally "gnus" - although I don't know what "Gmail-like style" is.
Yeah

>slrn. Is good.
Unless I am missing something, it does not do email.

>http://incubator.apache.org/wave/
Are you suggesting I run my own webserver to aggregate emails, stick them in wave, and then write something that will convert my wave post to email? I suppose it could work, but that is *usually* not what is considered a "desktop app".

> Maybe one Apache's Buzz?
I think you will have to Google that one for me, as the first results I found were Apache Wicket and Apache Beehive...both which seem not related.


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ramit.prasad at jpmorgan.com  Fri Sep 30 13:48:25 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 13:48:25 -0400
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678F0@EMARC112VS01.exchad.jpmchase.net>

>> The answer to any news/mail client with feature X type question is 
>> normally "gnus" - although I don't know what "Gmail-like style" is.
>Yeah

Gah, I got distracted mid-email and forgot to finish. What I wanted to say was, "Yeah, not knowing what 'Gmail-like style' makes a big difference ;)".

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423




This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From rantingrick at gmail.com  Fri Sep 30 14:08:16 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 11:08:16 -0700 (PDT)
Subject: Benefit and belief
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
	<55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
	<mailman.1628.1317400611.27778.python-list@python.org>
Message-ID: <cfb688fb-235c-48f4-ae18-de0ce89079b2@b6g2000vbz.googlegroups.com>

On Sep 30, 11:36?am, Westley Mart?nez <aniko... at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 09:22:59AM -0700, rusi wrote:
> > On Sep 30, 8:58???pm, Neil Cerutti <ne... at norwich.edu> wrote:
> > > On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
>
> > > > I still assert that contradiction is caused by narrow perspective.
>
> > > > By that I mean: just because an objects scope may not see a certain
> > > > condition, doesn't mean that condition is non-existant.
>
> > > > I also propose that just because something seems to contradict doesn't
> > > > mean it is false. Take for instance:
>
> > > > Look out your window. Is it daylight or night time? You may say
> > > > it is daylight or you may say it is night time. I would
> > > > disagree that only one of those conditions are true. Both
> > > > conditions are true. Always. It is only day (or night) for YOU.
> > > > But the opposite DOES in fact exist on the other side of the
> > > > world at the same time.
>
> > > > I call this Duality of Nature (and I believe there was some
> > > > religion somewhere in some time that has the same notion,
> > > > Budism I think but I could be mistaken). I see such
> > > > "contradictions" in what appears to be most truths.
>
> > > You are not alone. Many ancient philosophers, fathers of
> > > religious and scientific thought, thought the same.
>
> > > They thought that contradictory qualities could exist in objects
> > > simultaneously. For example, they thought that a cat was both big
> > > and small, because it was big compared to a mouse and small
> > > compared to a house. They didn't notice that big and small were
> > > not poperties of the cat, at all but were instead statements
> > > about how a cat relates to another object.
>
> > > When you say, "It is night," you are making an assertion about a
> > > position on the surface of the earth and its relationship to the
> > > sun.
>
> > > If you are not discussing a specific a position on the Earth,
> > > then you cannot make a meaningful assertion about night or day at
> > > all. Night and Day are not qualities of the entire Earth, but
> > > only of positions on the Earth.
>
> > But just imagine that we were all pre-galiliean savages -- knowing
> > nothing about the roundness of the earth, the earth going round and so
> > on and somehow you and I get on the phone and we start arguing:
> > Rusi: Its 9:30 pm
> > Neil: No its 12 noon
>
> > How many cases are there?
> > We both may be right, I may be wrong (my watch may have stopped) or we
> > both etc
>
> > ie conflicting data may get resolved within a larger world view (which
> > is what devplayer is probably saying).
>
> > Until then it is wiser to assume that that larger world view exists
> > (and I dont yet know it)
> > than to assume that since I dont know it it does not exist.
>
> > For me (admittedly an oriental) such agnosticism (literally "I-do-not-
> > know-ness") is as much a foundation for true religiosity as effective
> > science
>
> I.e. humility?

@DevPlayer, rusi, Neil, Wes, and group

Yes, there are two views of reality; that of the absolute and that of
the relative. Both are true. It is always daytime and nighttime
simultaneously; if you look at things from a global perspective.

However, the true nature of "daytime vs nighttime" is purely a
relative observation. The fact that both exist does not falsify the
validity of the relative view. Recognizing the paradox is important
and proves you are not confined to your own selfish view points and
are in fact an intelligent being.


From rbotting at csusb.edu  Fri Sep 30 14:34:37 2011
From: rbotting at csusb.edu (RJB)
Date: Fri, 30 Sep 2011 11:34:37 -0700 (PDT)
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <a59fdb41-baae-4f3b-b8bf-1ce89b0f2177@z19g2000vby.googlegroups.com>

On Sep 29, 3:52?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Alain Ketterlin wrote:
> > Steven D'Aprano <steve+comp.lang.pyt... at pearwood.info> writes:
>
> >> I have a Python script which I would like to test without a tty attached
> >> to the process. I could run it as a cron job, but is there an easier way?
>
> >> I am running Linux.
>
> > Isn't os.setsid() what you're looking for? It makes the calling process
> > have no controlling terminal. There's also a user command called setsid
> > that should have the same effect.
>
> It doesn't appear so to me.
>
> [steve at sylar ~]$ tty
> /dev/pts/16
> [steve at sylar ~]$ setsid tty
> /dev/pts/16
>
> [steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
> [steve at sylar ~]$ setsid python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
>
> If I run the same Python command (without the setsid) as a cron job, I
> get False emailed to me. That's the effect I'm looking for.
>
> --
> Steven

You could try the old UNIX "nohup ... &" technique for running a
process in the background (the &) with no HangUP if you log out:

$ nohup python -c "import sys,os; print
os.isatty(sys.stdout.fileno())" &
appending output to nohup.out
$ cat nohup.out
False

But that is over kill I guess.

One worrying detail.... the definition of a running process in UNIX
implies is that it has standard input/output files open.
You'd be wise to make sure that they are connected to things that are
safe.... /dev/null.

Even so /dev/tty can be opened any way...

Hope this helps.


From derek at simkowiak.net  Fri Sep 30 14:42:57 2011
From: derek at simkowiak.net (Derek Simkowiak)
Date: Fri, 30 Sep 2011 11:42:57 -0700
Subject: Motion Tracking with Python
In-Reply-To: <201109300906.43128.rick.mansilla@gmail.com>
References: <4E852694.4080303@simkowiak.net>
	<201109300906.43128.rick.mansilla@gmail.com>
Message-ID: <4E860DB1.202@simkowiak.net>

 > /I am having problems with getting data from the CCD (basically i 
don't know how to do it :), can you give me a tip for doing this? Or 
explain how you did it please?/

     I am using the OpenCV library to grab images.  Here are the 
specific lines of code:

self.capture = cv.CaptureFromCAM(0)cv.SetCaptureProperty( self.capture, 
cv.CV_CAP_PROP_FRAME_WIDTH, 320 );cv.SetCaptureProperty( self.capture, 
cv.CV_CAP_PROP_FRAME_HEIGHT, 240 );frame = cv.QueryFrame(self.capture) # 
...this is done repeatedly in the main loop.


     These were copied from the examples that came with OpenCV.  I don't 
know if this will work under Windows.

     The source code to my script is available online; I recommend 
downloading it and playing with it.  Also, check out the OpenCV Python 
documentation.


Thanks,
Derek

On 09/30/2011 07:06 AM, Ricardo Mansilla wrote:
>
> On Thursday 29 September 2011 21:16:52 you wrote:
>
> > Hello,
>
> > I have a neat Python project I'd like to share. It does real-time motion
>
> > tracking, using the Python bindings to the OpenCV library:
>
> >
>
> > http://derek.simkowiak.net/motion-tracking-with-python/
>
> >
>
> > There is a YouTube video showing the script in action.
>
> >
>
> > It's especially neat because my daughter and I worked together on this
>
> > project. We used it to track her two pet gerbils, as part of her science
>
> > fair project. She wrote her own (separate) Python script to read the
>
> > motion tracking log files, compute distance and velocity, and then
>
> > export those values in a CSV file. Like I say on the web page: "I?m
>
> > convinced that Python is the best language currently available for
>
> > teaching kids how to program."
>
> >
>
> > I also use Python professionally, and it's worked out great every time.
>
> > There's no job Python can't handle.
>
> >
>
> >
>
> > Thanks,
>
> > Derek Simkowiak
>
> > http://derek.simkowiak.net
>
> Hi, this is awesome!!
>
> I'm currently working in something similar, but I am having problems 
> with getting data from the CCD (basically i don't know how to do it 
> :), can you give me a tip for doing this? Or explain how you did it 
> please?
>
> I not a newbie at python but not as experienced as evidently you are.
>
> Thanks a lot in advance.
>
>
> -- 
>
> (...)Also, since that same law states that any system able to prove 
> its consistency to itself must be inconsistent; any mind that believes 
> it can prove its own sanity is, therefore, insane.(...)
>
> Kurt G?del.
>

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From derek at simkowiak.net  Fri Sep 30 14:48:26 2011
From: derek at simkowiak.net (Derek Simkowiak)
Date: Fri, 30 Sep 2011 11:48:26 -0700
Subject: Motion Tracking with Python
In-Reply-To: <4e85f0ff$0$2529$e4fe514c@news2.news.xs4all.nl>
References: <mailman.1603.1317355329.27778.python-list@python.org>
	<4e85f0ff$0$2529$e4fe514c@news2.news.xs4all.nl>
Message-ID: <4E860EFA.1020807@simkowiak.net>

>  /How was her project received at school?/


     She got an "Outstanding" blue ribbon award.  The teachers were 
impressed.

     (It was only a mandatory school project; it was not part of a 
regional competition or anything fancy like that.)

--Derek

On 09/30/2011 09:40 AM, Irmen de Jong wrote:
> On 30-9-2011 4:16, Derek Simkowiak wrote:
>> Hello,
>> I have a neat Python project I'd like to share. It does real-time motion tracking, using
>> the Python bindings to the OpenCV library:
>>
>> http://derek.simkowiak.net/motion-tracking-with-python/
>>
>> There is a YouTube video showing the script in action.
>>
>> It's especially neat because my daughter and I worked together on this project. We used
>> it to track her two pet gerbils, as part of her science fair project. She wrote her own
>> (separate) Python script to read the motion tracking log files, compute distance and
>> velocity, and then export those values in a CSV file. Like I say on the web page: "I?m
>> convinced that Python is the best language currently available for teaching kids how to
>> program."
> Wow. Very impressive and very enjoyable to read about it. How was her project received
> at school?
>
> Thanks a lot for sharing this.
>
> Irmen de Jong

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From anikom15 at gmail.com  Fri Sep 30 15:27:14 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Fri, 30 Sep 2011 12:27:14 -0700
Subject: Benefit and belief
In-Reply-To: <cfb688fb-235c-48f4-ae18-de0ce89079b2@b6g2000vbz.googlegroups.com>
References: <20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
	<55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
	<mailman.1628.1317400611.27778.python-list@python.org>
	<cfb688fb-235c-48f4-ae18-de0ce89079b2@b6g2000vbz.googlegroups.com>
Message-ID: <20110930192714.GA14314@Smoke>

On Fri, Sep 30, 2011 at 11:08:16AM -0700, rantingrick wrote:
> On Sep 30, 11:36?am, Westley Mart?nez <aniko... at gmail.com> wrote:
> > On Fri, Sep 30, 2011 at 09:22:59AM -0700, rusi wrote:
> > > On Sep 30, 8:58???pm, Neil Cerutti <ne... at norwich.edu> wrote:
> > > > On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
> >
> > > > > I still assert that contradiction is caused by narrow perspective.
> >
> > > > > By that I mean: just because an objects scope may not see a certain
> > > > > condition, doesn't mean that condition is non-existant.
> >
> > > > > I also propose that just because something seems to contradict doesn't
> > > > > mean it is false. Take for instance:
> >
> > > > > Look out your window. Is it daylight or night time? You may say
> > > > > it is daylight or you may say it is night time. I would
> > > > > disagree that only one of those conditions are true. Both
> > > > > conditions are true. Always. It is only day (or night) for YOU.
> > > > > But the opposite DOES in fact exist on the other side of the
> > > > > world at the same time.
> >
> > > > > I call this Duality of Nature (and I believe there was some
> > > > > religion somewhere in some time that has the same notion,
> > > > > Budism I think but I could be mistaken). I see such
> > > > > "contradictions" in what appears to be most truths.
> >
> > > > You are not alone. Many ancient philosophers, fathers of
> > > > religious and scientific thought, thought the same.
> >
> > > > They thought that contradictory qualities could exist in objects
> > > > simultaneously. For example, they thought that a cat was both big
> > > > and small, because it was big compared to a mouse and small
> > > > compared to a house. They didn't notice that big and small were
> > > > not poperties of the cat, at all but were instead statements
> > > > about how a cat relates to another object.
> >
> > > > When you say, "It is night," you are making an assertion about a
> > > > position on the surface of the earth and its relationship to the
> > > > sun.
> >
> > > > If you are not discussing a specific a position on the Earth,
> > > > then you cannot make a meaningful assertion about night or day at
> > > > all. Night and Day are not qualities of the entire Earth, but
> > > > only of positions on the Earth.
> >
> > > But just imagine that we were all pre-galiliean savages -- knowing
> > > nothing about the roundness of the earth, the earth going round and so
> > > on and somehow you and I get on the phone and we start arguing:
> > > Rusi: Its 9:30 pm
> > > Neil: No its 12 noon
> >
> > > How many cases are there?
> > > We both may be right, I may be wrong (my watch may have stopped) or we
> > > both etc
> >
> > > ie conflicting data may get resolved within a larger world view (which
> > > is what devplayer is probably saying).
> >
> > > Until then it is wiser to assume that that larger world view exists
> > > (and I dont yet know it)
> > > than to assume that since I dont know it it does not exist.
> >
> > > For me (admittedly an oriental) such agnosticism (literally "I-do-not-
> > > know-ness") is as much a foundation for true religiosity as effective
> > > science
> >
> > I.e. humility?
> 
> @DevPlayer, rusi, Neil, Wes, and group
> 
> Yes, there are two views of reality; that of the absolute and that of
> the relative. Both are true. It is always daytime and nighttime
> simultaneously; if you look at things from a global perspective.
> 
> However, the true nature of "daytime vs nighttime" is purely a
> relative observation. The fact that both exist does not falsify the
> validity of the relative view. Recognizing the paradox is important
> and proves you are not confined to your own selfish view points and
> are in fact an intelligent being

What paradox?.


From alec.taylor6 at gmail.com  Fri Sep 30 15:57:13 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 1 Oct 2011 05:57:13 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678F0@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678F0@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAO+9iGc3xd6CiUgR4YX=HDGuYKALOyKtORH9ROqmNH06v2+8og@mail.gmail.com>

Meh, so run your own web-server.

If wave isn't right, search on sourceforge for a while.

On 10/1/11, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>> The answer to any news/mail client with feature X type question is
>>> normally "gnus" - although I don't know what "Gmail-like style" is.
>>Yeah
>
> Gah, I got distracted mid-email and forgot to finish. What I wanted to say
> was, "Yeah, not knowing what 'Gmail-like style' makes a big difference ;)".
>
> Ramit
>
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
>
>
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available at http://www.jpmorgan.com/pages/disclosures/email.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From nobody at nowhere.com  Fri Sep 30 16:09:54 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 30 Sep 2011 21:09:54 +0100
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
Message-ID: <pan.2011.09.30.20.09.53.397000@nowhere.com>

On Thu, 29 Sep 2011 11:53:12 +0200, Alain Ketterlin wrote:

>> I have a Python script which I would like to test without a tty attached 
>> to the process. I could run it as a cron job, but is there an easier way?
>>
>> I am running Linux.
> 
> Isn't os.setsid() what you're looking for? It makes the calling process
> have no controlling terminal. There's also a user command called setsid
> that should have the same effect.

setsid() requires that the calling process isn't a process group
leader; this can be achieved by fork()ing. The setsid command does this
automatically.

As you say, this ensures that the process has no controlling terminal
(i.e. it won't get signals from the tty driver for ^C, ^Z, hangup, etc).
It won't detach stdin etc from a terminal. Also, open()ing a tty will
result in it becoming the controlling terminal unless O_NOCTTY is used.

I suspect that the OP just wants e.g.:

	script.py &>/dev/null <&-

which will redirect stdout and stderr to /dev/null and close stdin.



From nobody at nowhere.com  Fri Sep 30 16:20:52 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 30 Sep 2011 21:20:52 +0100
Subject: Modifying external running process using python
References: <086bd803-ddc5-4913-b1f1-5fb6cb5848bb@i28g2000yqn.googlegroups.com>
Message-ID: <pan.2011.09.30.20.20.51.581000@nowhere.com>

On Thu, 29 Sep 2011 23:02:55 -0700, bingbang wrote:

> Beginner here. I am trying to figure out how to modify a running
> process on a linux system using Python.

> I looked up trace and some other modules but they all seem to do with
> following the currently executing python process.

ptrace() is the system call which programs such as gdb, strace, ltrace,
etc use to monitor or control another process. You wil probably need to
use ctypes to access this function from Python.

> Let's assume I have sudo/root privileges and that the POC code "only
> needs to work in linux".

You don't need root privilege to ptrace() a process which you own and
which isn't privileged (a process which starts out setuid/setgid is still
treated as privileged even if it reverts to the real user/group IDs).



From joncle at googlemail.com  Fri Sep 30 16:51:43 2011
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 30 Sep 2011 13:51:43 -0700 (PDT)
Subject: Simplest way to resize an image-like array
References: <fb126bd8-7b71-4e61-b44d-95848c591d97@t11g2000yqa.googlegroups.com>
Message-ID: <9b0b8951-bfc2-4047-8b4e-1ee0af20af27@q24g2000vby.googlegroups.com>

On Sep 30, 5:40?pm, John Ladasky <lada... at my-deja.com> wrote:
> Hi folks,
>
> I have 500 x 500 arrays of floats, representing 2D "grayscale" images,
> that I need to resample at a lower spatial resolution, say, 120 x 120
> (details to follow, if you feel they are relevant).
>
> I've got the numpy, and scipy, and matplotlib. All of these packages
> hint at the fact that they have the capability to resample an image-
> like array. ?But after reading the documentation for all of these
> packages, none of them make it straightforward, which surprises me.
> For example, there are several spline and interpolation methods in
> scipy.interpolate. ?They seem to return interpolator classes rather
> than arrays. ?Is there no simple method which then calls the
> interpolator, and builds the resampled array?
>
> Yes, I can do this myself if I must -- but over the years, I've come
> to learn that a lot of the code I want is already written, and that
> sometimes I just have to know where to look for it.
>
> Thanks!

Is something like http://docs.scipy.org/doc/scipy/reference/generated/scipy.misc.imresize.html#scipy.misc.imresize
any use?


From hansmu at xs4all.nl  Fri Sep 30 17:09:02 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Fri, 30 Sep 2011 23:09:02 +0200
Subject: Python without a tty
In-Reply-To: <a59fdb41-baae-4f3b-b8bf-1ce89b0f2177@z19g2000vby.googlegroups.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<a59fdb41-baae-4f3b-b8bf-1ce89b0f2177@z19g2000vby.googlegroups.com>
Message-ID: <4e862fee$0$2438$e4fe514c@news2.news.xs4all.nl>

On 30/09/11 20:34:37, RJB wrote:
> You could try the old UNIX "nohup ...&" technique for running a
> process in the background (the&) with no HangUP if you log out:
>
> $ nohup python -c "import sys,os; print
> os.isatty(sys.stdout.fileno())"&
> appending output to nohup.out
> $ cat nohup.out
> False
>
> But that is over kill I guess.
>
> One worrying detail.... the definition of a running process in
> UNIX implies is that it has standard input/output files open.
> You'd be wise to make sure that they are connected to things
> that are safe.... /dev/null.
>
> Even so /dev/tty can be opened any way...

Not if you really detach from your tty: after you've detached,
there is no tty for /dev/tty to connect to and any attempt to
open it will raise IOError.

-- HansM



From navkirat.py at gmail.com  Fri Sep 30 23:25:54 2011
From: navkirat.py at gmail.com (Navkirat Singh)
Date: Sat, 1 Oct 2011 08:55:54 +0530
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
Message-ID: <CAKzQzuvY-4b70HFRu2_uHicjfXmG-D3nM89b2gaEy2_LTijsUQ@mail.gmail.com>

Lol you all sound like google's angry birds with their feathers ruffled by a
comment. You guys should open up another mailing list to extinguish your
virtually bruised egos. . . .
On Sep 30, 2011 10:27 PM, "Prasad, Ramit" <ramit.prasad at jpmorgan.com> wrote:
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From nagle at animats.com  Thu Sep  1 00:22:23 2011
From: nagle at animats.com (John Nagle)
Date: Wed, 31 Aug 2011 21:22:23 -0700
Subject: try... except with unknown error types
In-Reply-To: <4e51a32d$0$29974$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.230.1313780957.27778.python-list@python.org>
	<j2mcne$rmo$1@reader1.panix.com>
	<4e4ec405$0$29994$c3e8da3$5496439d@news.astraweb.com>
	<7xipprsxha.fsf@ruckus.brouhaha.com>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.283.1313954283.27778.python-list@python.org>
	<4e51a32d$0$29974$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e5f089b$0$2148$742ec2ed@news.sonic.net>

On 8/21/2011 5:30 PM, Steven D'Aprano wrote:
> Chris Angelico wrote:
>
>
>> A new and surprising mode of network failure would be indicated by a
>> new subclass of IOError or EnvironmentError.
>
> /s/would/should/
>
> I don't see why you expect this, when *existing* network-related failures
> aren't:
>
>>>> import socket
>>>> issubclass(socket.error, EnvironmentError)
> False
>
> (Fortunately that specific example is fixed in Python 3.)

    I think I reported that some years ago.

    There were some other errors in the URL and SSL area that
weren't subclasses of EnvironmentError.  It's also possible
to get UnicodeError from URL operations.

					John Nagle


From sahil at FreeBSD.org  Thu Sep  1 00:56:50 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Thu, 1 Sep 2011 00:56:50 -0400
Subject: idiomatic analogue of Perl's: while (<>) { ... }
Message-ID: <20110901045650.GA3466@magic.hamla.org>

I've been tasked with converting some programs from Perl -> Python, and
am (as will soon be obvious) new to the language.  A few archive/google
searches were inconclusive on a consensus approach, which is OK, but I
just wonder if there is a more Python-esque way to do the following in
Python 2.7.1:

%%
# unbuffer STDOUT
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

# process input, line-by-line, and print responses after parsing input 
while 1:
  rval = parse(raw_input())
  if rval == None:
    print('foo')
  else:
    print('bar')
%%

This works, but while reading the documentation, I thought of using 'for
line in fileinput.input()' in lieu of 'while 1:' construct.  This does
not work when debugging the program on the command line -- the script
appears to just hang no matter what is typed into STDIN.  I believe this
is because of some internal buffering when using fileinput.  Is there a
recommended way to disable such buffering?  Am I taking a totally wrong
approach?

Feel free to just link me to previous discussions on the topic(s) if I
have missed them.  Please be gentle with your cluebats. :-)

Thanks,
-- 
Sahil Tandon <sahil at FreeBSD.org>


From kushal.kumaran+python at gmail.com  Thu Sep  1 01:21:36 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Thu, 1 Sep 2011 10:51:36 +0530
Subject: How to daemonize a HTTPServer
In-Reply-To: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
References: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
Message-ID: <CAH8GtdMFp5ydv6JB66n_0g=rGiZgn_AtvHH9AC9VpZkjpWYG2A@mail.gmail.com>

On 1 Sep 2011 08:54, "babbu Pehlwan" <nemjain2 at gmail.com> wrote:
>
> I have written a http server using BaseHTTPServer module. Now I want
> to instantiate it through another python script. The issue here is
> after instantiate the control doesn't come back till the server is
> running. Please suggest.

What did a web search for "python daemon" lead to? I believe there's a
python-daemon package available on pypi.

-- 
regards,
kushal
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From steve+comp.lang.python at pearwood.info  Thu Sep  1 02:02:54 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 01 Sep 2011 16:02:54 +1000
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <mailman.644.1314853527.27778.python-list@python.org>
Message-ID: <4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>

On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:

> I've been tasked with converting some programs from Perl -> Python, and
> am (as will soon be obvious) new to the language.  A few archive/google
> searches were inconclusive on a consensus approach, which is OK, but I
> just wonder if there is a more Python-esque way to do the following in
> Python 2.7.1:
> 
> %%
> # unbuffer STDOUT
> sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

I've never bothered with unbuffered stdout, but that looks fine to me.

I'm not sure if it is necessary though, because print seems to automatically
flush the buffer after each line in my testing. Unless you're printing
repeatedly to the same line, I'm not sure unbuffered stdout is helpful.


> # process input, line-by-line, and print responses after parsing input
> while 1:
>   rval = parse(raw_input())
>   if rval == None:
>     print('foo')
>   else:
>     print('bar')
> %%

"while True" is considered slightly more idiomatic (readable), but
otherwise, that seems fine.

 
> This works, but while reading the documentation, I thought of using 'for
> line in fileinput.input()' in lieu of 'while 1:' construct.  This does
> not work when debugging the program on the command line -- the script
> appears to just hang no matter what is typed into STDIN.  I believe this
> is because of some internal buffering when using fileinput.  Is there a
> recommended way to disable such buffering?  Am I taking a totally wrong
> approach?

I'm not sure anything about fileinput is exactly *recommended*, it's kinda
discouraged on account of being a bit slow. See help(fileinput) at the
interactive prompt.

For what it's worth, the default buffersize for fileinput.input is 0, so if
that doesn't do what you want, I don't think fileinput is the right
solution.



-- 
Steven



From __peter__ at web.de  Thu Sep  1 02:31:32 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 08:31:32 +0200
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <20110901045650.GA3466@magic.hamla.org>
Message-ID: <j3n8r3$heg$1@dough.gmane.org>

Sahil Tandon wrote:

> I've been tasked with converting some programs from Perl -> Python, and
> am (as will soon be obvious) new to the language.  A few archive/google
> searches were inconclusive on a consensus approach, which is OK, but I
> just wonder if there is a more Python-esque way to do the following in
> Python 2.7.1:
> 
> %%
> # unbuffer STDOUT
> sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
> 
> # process input, line-by-line, and print responses after parsing input
> while 1:
>   rval = parse(raw_input())
>   if rval == None:
>     print('foo')
>   else:
>     print('bar')
> %%
> 
> This works, but while reading the documentation, I thought of using 'for
> line in fileinput.input()' in lieu of 'while 1:' construct.  This does
> not work when debugging the program on the command line -- the script
> appears to just hang no matter what is typed into STDIN.  I believe this
> is because of some internal buffering when using fileinput.  Is there a
> recommended way to disable such buffering?  Am I taking a totally wrong
> approach?
> 
> Feel free to just link me to previous discussions on the topic(s) if I
> have missed them.  Please be gentle with your cluebats. :-)

A quick look into fileinput.py reveals that it uses readlines() and slurps 
in the complete "file". I'm not sure that was a clever design decision...

Here's a partial reimplementation that should work for your use-case:

import sys
from itertools import chain

def _open_many(files):
    for file in files:
        if file == "-":
            yield sys.stdin
        else:
            with open(file) as f:
                yield f

def input(files=None, buffered=False):
    if files is None:
        files = sys.argv[1:]
    if not files:
        files = ["-"]
    files = _open_many(files)
    if not buffered:
        files = (iter(file.readline, "") for file in files)
    return chain.from_iterable(files)

for line in input():
    print line.strip().upper()




From __peter__ at web.de  Thu Sep  1 03:43:04 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 09:43:04 +0200
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <20110901045650.GA3466@magic.hamla.org>
	<j3n8r3$heg$1@dough.gmane.org>
Message-ID: <j3nd17$ei8$1@dough.gmane.org>

Peter Otten wrote:

> A quick look into fileinput.py reveals that it uses readlines() and slurps
> in the complete "file". I'm not sure that was a clever design decision...

Correction: 

>>> with open("tmp.txt") as f: lines = f.readlines(0)
...
>>> len(lines)
1000000
>>> with open("tmp.txt") as f: lines = f.readlines(1)
...
>>> len(lines)
301
>>> len("".join(lines))
8208

So on my system file.readlines(size) stops after about 2**13 bytes which is 
not a problem memorywise. Sorry for the confusion.



From msamogh at gmail.com  Thu Sep  1 03:48:52 2011
From: msamogh at gmail.com (Amogh M S)
Date: Thu, 1 Sep 2011 13:18:52 +0530
Subject: Constructors...BIIIIG PROBLEM!
Message-ID: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>

Hey guys...
I think we have a problem with my _init_ method and the constructor
When I create a class and its _init_ method and try to create an object of
it outside the class,
Say, something like

class S:
   def _init_(self, name=None):
       self.name = name
s = S("MyName")

It says that the constructor takes no arguments!! I have to explicitly call
the _init_ method which, I think is not the right way of doing things...
Could you tell me if that is what is supposed to happen or is something
wrong with my code?
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From __peter__ at web.de  Thu Sep  1 03:56:11 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 09:56:11 +0200
Subject: Constructors...BIIIIG PROBLEM!
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
Message-ID: <j3ndpq$hf9$1@dough.gmane.org>

Amogh M S wrote:

> Hey guys...
> I think we have a problem with my _init_ method and the constructor
> When I create a class and its _init_ method and try to create an object of
> it outside the class,
> Say, something like
> 
> class S:
>    def _init_(self, name=None):

Your __init__() method needs two leading and two trailing underscores.

>        self.name = name
> s = S("MyName")
> 
> It says that the constructor takes no arguments!! I have to explicitly
> call the _init_ method which, I think is not the right way of doing
> things... Could you tell me if that is what is supposed to happen or is
> something wrong with my code?




From motoom at xs4all.nl  Thu Sep  1 04:00:27 2011
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 1 Sep 2011 10:00:27 +0200
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
Message-ID: <8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>


On Sep 1, 2011, at 09:48, Amogh M S wrote:

> Hey guys... 
> I think we have a problem with my _init_ method and the constructor
> When I create a class and its _init_ method and try to create an object of it outside the class,
> Say, something like
> 
> class S:
>    def _init_(self, name=None):
>        self.name = name
> s = S("MyName")

Two things: Derive your class from object, and the constructor function should be '__init__', that is, with *two* underscores before and after it. Are you reading a book or tutorial which does use a badly chosen font which doesn't distinguish two consecutive underscores well?

class S(object):
    def __init__(self, name=None):
        self.name = name

s = S("MyName")
print s.name

Greetings,


-- 
"If you don't know, the thing to do is not to get scared, but to learn." - Ayn Rand      





From airween at gmail.com  Thu Sep  1 04:24:29 2011
From: airween at gmail.com (=?utf-8?Q?Heged=C3=BCs?= Ervin)
Date: Thu, 1 Sep 2011 10:24:29 +0200
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
	<8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
Message-ID: <20110901082427.GA18046@arxnet.hu>

hello,

On Thu, Sep 01, 2011 at 10:00:27AM +0200, Michiel Overtoom wrote:
> On Sep 1, 2011, at 09:48, Amogh M S wrote:
[...]
> > class S:
> >    def _init_(self, name=None):
> >        self.name = name
> > s = S("MyName")
> 
> Two things: Derive your class from object,

why's that better than just create a simple class, without
derive?


thanks:

a.



From motoom at xs4all.nl  Thu Sep  1 05:04:18 2011
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 1 Sep 2011 11:04:18 +0200
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <20110901082427.GA18046@arxnet.hu>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
	<8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
	<20110901082427.GA18046@arxnet.hu>
Message-ID: <85112CB3-E5C1-42F5-9F2C-EFDFB3086EB0@xs4all.nl>


On Sep 1, 2011, at 10:24, Heged?s Ervin wrote:

> On Thu, Sep 01, 2011 at 10:00:27AM +0200, Michiel Overtoom wrote:
>> Derive your class from object,
> 
> why's that better than just create a simple class, without
> derive?

Amongst other things, fixes to the type system and the method resolution order.

http://docs.python.org/reference/datamodel.html#new-style-and-classic-classes
http://unspecified.wordpress.com/2010/11/18/pythons-new-classes-vs-old-classes/
http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html
http://www.python.org/download/releases/2.2.3/descrintro/

Greetings,

-- 
"If you don't know, the thing to do is not to get scared, but to learn." - Ayn Rand      





From dotancohen at gmail.com  Thu Sep  1 05:42:04 2011
From: dotancohen at gmail.com (Dotan Cohen)
Date: Thu, 1 Sep 2011 12:42:04 +0300
Subject: Regex to match all trailing whitespace _and_ newlines.
Message-ID: <CAKDXFkPG8d+k0rgM131UFqf6LvsnyRmV-hctpOq0RSA6myVRGw@mail.gmail.com>

In the terrific Anki [1] application I am trying to remove trailing
whitespace from form fields. This is my regex:
[\n+\s+]$

Actually, even simplifying it to [\n] or [\r\n] is not matching any
newlines! What might be the cause of this? Note that I am not entering
the regex in Python code, I am entering it in a regex-supporting
Find/Replace dialogue in Anki. Anki is written in Python.

Thanks.

[1] ankisrs.net

-- 
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com


From __peter__ at web.de  Thu Sep  1 06:30:15 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 01 Sep 2011 12:30:15 +0200
Subject: Regex to match all trailing whitespace _and_ newlines.
References: <mailman.653.1314870127.27778.python-list@python.org>
Message-ID: <j3nmqm$vp4$1@solani.org>

Dotan Cohen wrote:

> In the terrific Anki [1] application I am trying to remove trailing
> whitespace from form fields. This is my regex:
> [\n+\s+]$

My attempt:

>>> sub = re.compile(r"\s*?(\n|$)").sub
>>> sub("<EOL>", "alpha   \nbeta   \r\n\ngamma\n")
'alpha<EOL>beta<EOL><EOL>gamma<EOL>'
>>> sub("<EOL>", "alpha   \nbeta   \r\n\ngamma")
'alpha<EOL>beta<EOL><EOL>gamma<EOL>'
>>> sub("<EOL>", "alpha   \nbeta   \r\n\ngamma\t")
'alpha<EOL>beta<EOL><EOL>gamma<EOL>'



From fnautaNO at SPAMsolfon.nl  Thu Sep  1 06:30:40 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Thu, 1 Sep 2011 12:30:40 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net>
	<mailman.620.1314810894.27778.python-list@python.org>
Message-ID: <9c9578F5eaU1@mid.individual.net>

"Paul K?lle" <paul at subsignal.org> wrote in message 
news:mailman.620.1314810894.27778.python-list at python.org...
> Hi, answers below...
>
> Am 31.08.2011 14:18, schrieb Fokke Nauta:
>> "Paul K?lle"<paul at subsignal.org>  wrote in message
>> news:mailman.595.1314780791.27778.python-list at python.org...
>>> Hi,
>>>
>>> Am 30.08.2011 22:00, schrieb Fokke Nauta:
>>>> Hi all,
>>>>
>>>> I am completely new to Python, but I'm confronted with a problem I 
>>>> can't
>>>> solve.
>>> Welcome to python.
>>>
>>>> This is my question:
>>> [snip]
>>>
>>>> I installed Python 3.2.1 and extracted the packages PyWebDAV and PyXML.
>>>> Now
>>>> I have a working Python app and 2 directories called PyWebDAV-0.9.4.1 
>>>> and
>>>> PyXML-0.8.4. In the PyWebDAV README it says:
>>>>
>>>> Installation and setup of server can be as easy as follows:
>>>>
>>>> $ easy_install PyWebDAV
>>>> $ davserver -D /tmp -n -J
>>>>
>>>> But of course it doesn't work like that. When I start up Python GUI I 
>>>> see
>>>> the ">>>" prompt instead of the "$" prompt. But where do I place the 
>>>> two
>>>> directories? And there is no easy_install script in the PyXML-0.8.4
>>>> directory, only a setup.py and ez_setup.py script. I guess the latter 
>>>> is
>>>> the
>>>> one to use. But how?
>>> You dont install from "Python GUI", use normal cmd, navigate to the 
>>> folder
>>> you downloaded PyXML and PyWebDAV and run "python setup.py install"
>>> (python.exe has to be in your PATH). Then you have to find the
>>> startup-script "davserver". Find your python installation directory and
>>> look into<Install dir>/Tools/Scripts, in my computer this is
>>> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
>>> site-packages folder i.e. E:\python27\Lib/site-packages. You might have 
>>> to
>>> look for "davserver" there...
>>>
>>
>> Thanks, Paul.
>>
>> I ran "python setup.py install" in both the PyXML and PyWebDAV 
>> directories.
>> A lot of things happened and are added into those directories and I guess 
>> it
>> will be OK.
>> Next step, the startup-script "davserver". There is no script as such, 
>> also
>> not in \python27\tools\scripts.
>> I found 2 similar scripts:
>> 1. server.py in D:\Python27\WebDAV\PyWebDAV\DAVServer
>> 2. WebDAVServer.py in D:\Python27\WebDAV\PyWebDAV\DAV
>>
>> Which one is the one to use?
> Your install locations look odd, but it might work nevertheless. The 
> server is in DAVServer\server.py, you can look at the file and you will 
> see:
>
> if __name__ == '__main__':
>     run()
>
> at the bottom. This is the "entry point" of a python script if called from 
> the command line.

Yes, it was server.py.

> My install looks a bit different but I can start the server as follows:
> python.exe 
> E:\Python27\Lib\site-packages\pywebdav-0.9.4.1-py2.7.egg\DAVServer\server.py 
>  -D c:\home -n
> WARNING:pywebdav:Authentication disabled!
> Listening on localhost (8008)

I used server.py e:/wwwroot -m -c config.ini

>> I also configured config.ini in D:\Python27\WebDAV\PyWebDAV\DAVServer
> I would use a config file outside the program directory and use the -c 
> or --config switch, run server.py without arguments to see possible 
> startup options.
>
>>
>> In this file it says:
>> "# Auth Database Table, Must exists in database prior to firstrun
>> dbtable=webDav
>>
>> # Create User Database Table and Insert system user"
>>
>> I created in MySQL a database called webDav.
>> I can create a table called User, but how many fields?
> Don't know if that's documented somewhere but you can just look at the 
> code in mysqlauth.py in the same directory as server.py. Seems it needs 
> three columns, (User<string>,Pass<string>,can_write<0|1>) but I haven't 
> tried.
>

I have understood that the database will be configured with the first run, 
but in my case it didn't.

In my congig.ini there was
# Create User Database Table and Insert system user
# Disable after the Table is created; for performance reasons
firstrun=1

Fokke




From fnautaNO at SPAMsolfon.nl  Thu Sep  1 06:30:43 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Thu, 1 Sep 2011 12:30:43 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net>
	<mailman.643.1314851358.27778.python-list@python.org>
Message-ID: <9c9578F5eaU2@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message
news:mailman.643.1314851358.27778.python-list at python.org...
> On Wed, 31 Aug 2011 14:18:00 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>>
>> I also configured config.ini in D:\Python27\WebDAV\PyWebDAV\DAVServer
>>
>> In this file it says:
>> "# Auth Database Table, Must exists in database prior to firstrun
>> dbtable=webDav
>>
>> # Create User Database Table and Insert system user"
>>
>> I created in MySQL a database called webDav.
>> I can create a table called User, but how many fields?
>>
> After looking at the config file.
>
> I presume you have specified the MySQL username/password

Sure

> (personally, and out of paranoia, I'd create a webDAV user/password that
> only has access rights to the specified webDAV database).
>
> Next, if you'd read further and didn't take the comment as the
> instruction. set
> firstrun=1

I did

> to tell the server this is the first time it is being run - IT WILL
> create the database table (after the first start, reset the flag to 0 to
> speed up later runs).

It didn't create the table. The database kept empty.

> Later in the config file set
> mysql_auth=1
> to enable the use of MySQL, and set the admin user/password to what you
> plan to have it use.

I did

> You probably want to set
> daemonize=1
> (maybe after first run)

I left this to 0.

> Oh, and don't forget to set the main data directory and any
> port/host changes.

I left host and port as they were. The main directory is e:\wwwroot

> Start the server - it should connect to MySQL, create the table, and
> add the admin user to the table.

I started the server with server.py (in
D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini

The seems to work as I get a login screen in the browser.

Later on I changed the ini file:

# disable auth
noauth = 1

# Enable mysql auth
mysql_auth=0

No login screen anymore but I got an error message "fshandler:get_data: 
e:\wwwroot not found"

Fokke





From martin.hellwig at gmail.com  Thu Sep  1 06:32:35 2011
From: martin.hellwig at gmail.com (Martin P. Hellwig)
Date: Thu, 01 Sep 2011 11:32:35 +0100
Subject: How to daemonize a HTTPServer
In-Reply-To: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
References: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
Message-ID: <j3nmvr$98t$1@dont-email.me>

On 01/09/2011 04:16, babbu Pehlwan wrote:
> I have written a http server using BaseHTTPServer module. Now I want
> to instantiate it through another python script. The issue here is
> after instantiate the control doesn't come back till the server is
> running. Please suggest.

Sounds like something you could use the multiprocessing module for, but 
then again my crystal ball is a bit fuzzy today.

-- 
mph


From andrei.lisnic at gmail.com  Thu Sep  1 06:40:25 2011
From: andrei.lisnic at gmail.com (UncleLaz)
Date: Thu, 1 Sep 2011 03:40:25 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
Message-ID: <058cb764-2ba2-4b63-be4d-33307a9a81cc@g31g2000yqh.googlegroups.com>

On Aug 31, 5:35?pm, "T. Goodchild" <tgoodch... at gmail.com> wrote:
> I?m new to Python, and I love it. ?The philosophy of the language (and
> of the community as a whole) is beautiful to me.
>
> But one of the things that bugs me is the requirement that all class
> methods have 'self' as their first parameter. ?On a gut level, to me
> this seems to be at odds with Python?s dedication to simplicity.
>
> For example, consider Python?s indent-sensitive syntax. ?Although
> other languages didn?t use indentation to specify scope, programmers
> always used indentation anyways. ?Making indentation took a common
> practice, made it a rule, and the result was a significantly improved
> signal-to-noise ratio in the readability of Python code.
>
> So why is 'self' necessary on class methods? ?It seems to me that the
> most common practice is that class methods *almost always* operate on
> the instance that called them. ?It would make more sense to me if this
> was assumed by default, and for "static" methods (methods that are
> part of a class, but never associated with a specific instance) to be
> labelled instead.
>
> Just curious about the rationale behind this part of the language.

It's required to make distinction between objects inside the calss and
outside of it. Seems pretty logical to me.


From yasar11732 at gmail.com  Thu Sep  1 06:51:43 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 1 Sep 2011 13:51:43 +0300
Subject: Invoking profile from command line prevent my sys.path modification
Message-ID: <CAFEUn8YAG5P92XTHaubMuX_NFG0b28+yhFkR3yf2QxQ4u5gFpQ@mail.gmail.com>

Hi,

I am new to profile module, so I am sorry if this is an absolute beginner
question. In order to my code to run, I need to add a directory to sys.path.
When I invole python -m profile myfile.py, my code won't work, saying that
the thing that is supposed to be in path, isn't. Code works fine without
profiling. Profiling works if I write it into the file, but I don't prefer
doing that, if that is possible.

-- 
http://yasar.serveblog.net/
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From motoom at xs4all.nl  Thu Sep  1 07:23:54 2011
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 1 Sep 2011 13:23:54 +0200
Subject: Why do class methods always need 'self' as the first parameter?
In-Reply-To: <058cb764-2ba2-4b63-be4d-33307a9a81cc@g31g2000yqh.googlegroups.com>
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<058cb764-2ba2-4b63-be4d-33307a9a81cc@g31g2000yqh.googlegroups.com>
Message-ID: <2B38B9D1-4DD5-4E88-B4DB-324A677C6BD1@xs4all.nl>


> On Aug 31, 5:35 pm, "T. Goodchild" <tgoodch... at gmail.com> wrote:


>> So why is 'self' necessary on class methods?
>> 
>> Just curious about the rationale behind this part of the language.

When instance variables are accessed with the 'self.varname' syntax, it is clear to the programmer that an instance variable is accessed, and not some global.  Other languages have weird syntax conventions like that you have to prepend all instance attributes with an '@', and in languages like C++ where there is not necessarily such a syntactic requirement, many programmers use ad-hoc constructs like '_varname' or 'm_varname' to make the distinction clear.


>> It seems to me that the
>> most common practice is that class methods *almost always* operate on
>> the instance that called them.  It would make more sense to me if this
>> was assumed by default, and for "static" methods (methods that are
>> part of a class, but never associated with a specific instance) to be
>> labelled instead.

Yes, you have a point there. My personal preference would be to optimize for the most common case, while exceptions to the norm are still possible, but perhaps a bit more verbose.

Greetings

-- 
"Learn to value yourself, which means: fight for your happiness."  - Ayn Rand      



From johnroth1 at gmail.com  Thu Sep  1 08:45:36 2011
From: johnroth1 at gmail.com (John Roth)
Date: Thu, 1 Sep 2011 05:45:36 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
Message-ID: <42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>

On Aug 31, 8:35?am, "T. Goodchild" <tgoodch... at gmail.com> wrote:
> I?m new to Python, and I love it. ?The philosophy of the language (and
> of the community as a whole) is beautiful to me.
>
> But one of the things that bugs me is the requirement that all class
> methods have 'self' as their first parameter. ?On a gut level, to me
> this seems to be at odds with Python?s dedication to simplicity.
>
> For example, consider Python?s indent-sensitive syntax. ?Although
> other languages didn?t use indentation to specify scope, programmers
> always used indentation anyways. ?Making indentation took a common
> practice, made it a rule, and the result was a significantly improved
> signal-to-noise ratio in the readability of Python code.
>
> So why is 'self' necessary on class methods? ?It seems to me that the
> most common practice is that class methods *almost always* operate on
> the instance that called them. ?It would make more sense to me if this
> was assumed by default, and for "static" methods (methods that are
> part of a class, but never associated with a specific instance) to be
> labelled instead.
>
> Just curious about the rationale behind this part of the language.

I personally consider this to be a wart. Some time ago I did an
implementation analysis. The gist is that, if self and cls were made
special variables that returned the current instance and class
respectively, then the compiler could determine whether a function was
an instance or class method. If it then marked the code object
appropriately you could get rid of all of the wrappers and the
attendant run-time overhead.

I've never published the analysis because that train has already left
the shed. The earliest it could be considered would be 4.0, which
isn't even on the horizon.

John Roth


From lanyjie at yahoo.com  Thu Sep  1 09:43:54 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Thu, 1 Sep 2011 06:43:54 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
Message-ID: <1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>

Hi Matt,

=======================================================
From: Matt Joiner <anacrolix at gmail.com>


The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
already heavily used by other syntactical structures.?

=======================================================

How about only require indentation
to freely break lines? Here is an example:

x = firstpart * secondpart #line breaks here
+ anotherpart #continue by indentation
+ stillanother #continue on.
#until here, another line starts by dedentation?
y = some_expression?- another_one

All this would be completely compatible with former code, while
having almost free line breaking! Plus, indentation makes it pretty.

Really hope Python can have freedom in breaking lines.

Yingjie
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From ian.g.kelly at gmail.com  Thu Sep  1 09:57:00 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 07:57:00 -0600
Subject: Constructors...BIIIIG PROBLEM!
In-Reply-To: <85112CB3-E5C1-42F5-9F2C-EFDFB3086EB0@xs4all.nl>
References: <CABWGKeW6sw2GJghQRbPcUA7_EO2V7SX5iJH0Pz0u513wX9TPNw@mail.gmail.com>
	<8D536E41-941B-45A8-BD27-0896ACD8CCD5@xs4all.nl>
	<20110901082427.GA18046@arxnet.hu>
	<85112CB3-E5C1-42F5-9F2C-EFDFB3086EB0@xs4all.nl>
Message-ID: <CALwzidkcoJAFRtsjTBHeu4=PD17cmu6g0sb5tqPG03XeLFJ1_g@mail.gmail.com>

On Thu, Sep 1, 2011 at 3:04 AM, Michiel Overtoom <motoom at xs4all.nl> wrote:
>
> On Sep 1, 2011, at 10:24, Heged?s Ervin wrote:
>
>> On Thu, Sep 01, 2011 at 10:00:27AM +0200, Michiel Overtoom wrote:
>>> Derive your class from object,
>>
>> why's that better than just create a simple class, without
>> derive?
>
> Amongst other things, fixes to the type system and the method resolution order.
>
> http://docs.python.org/reference/datamodel.html#new-style-and-classic-classes
> http://unspecified.wordpress.com/2010/11/18/pythons-new-classes-vs-old-classes/
> http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html
> http://www.python.org/download/releases/2.2.3/descrintro/

That is for Python 2.  For Python 3, old-style classes are gone, all
classes derive from object by default, and writing it explicitly is
merely good style for compatibility.


From dalist0 at gmail.com  Thu Sep  1 10:05:20 2011
From: dalist0 at gmail.com (Daniel)
Date: Thu, 1 Sep 2011 07:05:20 -0700 (PDT)
Subject: fun with nested loops
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>

Hi Steve,

Thanks for your comments, I appreciate any input.
> Do you think the software in the Apple iPod is "simple"? Or Microsoft
No, that's much more complicated that what I am doing.
But the iPod probably (?) doesn't get new algorithms based on a
specification discussed with non-programmers once a month.

I didn't explain enough of what I am doing. This is a fairly complex
application that has been running for a few years now,
I am just trying to improve it. The code runs a big
test machine, that runs >100000 individual tests in one run on
something like semiconductor chips.

The specification of these tests is already very complex, it has the
form of the nested loops,
for all these configurations try these steps, if they fail try them
again n times, if it still doesn't work give up
this configuration, if it works continue on to the next steps etc.
That's the form the specification is in, and it makes sense and is
very readable.
In pseudocode it looks like this, I am using @ to give loops a name:

@loop1
for c in configurations:
    @loop2
    while not_done:
        @loop3
        while step1_did_not_work:
            @loop4
            for substeps in step1 # loop 4a
                if hopeless(): continue loop1 # run next configuration
                if substepsFailed(): restart loop4 # try again
                if substepsWorked(): break loop3 # go on to next
steps, like loop4

That format is fine, everyone involved can understand it, even the
people in charge. I'd like to make this executable without
changing too much of the form. It would be possible to do this as a
FSM, but then you'd loose the line to line correspondence with the
specification, and of course some errors always creep in.

> non-CS people to be hacking the source code, they only interact with the
This is a research setting, so the person running the machine will
have to change the source from time to time if
he gets a new specification. The specifications are far to complex to
be entered into a user interface because of all the loops.

> the code by splitting it into functions appropriately, instead of the
> spaghetti code you have (apparently) written with jumps all over the place.
I wouldn't call the example above spaghetti code in the sense of old
Fortran or Basic full of gotos.
In a language that can break out of nested loops this is highly
structured code.
I am not jumping forward to labels, not jumping into functions, not
using jumps to replace loops etc.

It is like the Fortran example (just to show the syntax, has an
infinite loop), everyone can understand that right away, even
non Fortran people:

10 loop1: do I=1,3
    loop2: do J=1,4
        print *,I,J
        goto 10 ! redo loop1
        cycle loop1
        exit loop1
    enddo loop2
enddo loop1

There is no wild jumping her. The only problem is that Fortran does
not allow to restart a loop, so instead of restart loop1 you have to
do a goto 10. Otherwise you could do entirely without gotos (like in
Ruby with the redo, which is of course much much better)

> To take the most obvious, simple example: any time you have a loop that you
> might want to redo, the right solution is to put the loop inside a
> function, and then "redo the loop" becomes "call the function again".
Doesn't work, because it can only redo one level, to break out of the
next loop, I'd need exceptions anyway.
And having all of these exceptions as gotos doesn't make it more
readable.
Replacing loop4 by a function makes it possible to replace the restart
loop4 by a return, but then I still need an exception to
continue loop1 and one to break out of loop4 to indicate that we can
go on to the next step.

> I suppose that, just possibly, your application really would benefit from
> named labels to jump to. But if so, you've stumbled across something rarer
> than iridium.

Don't think so. I am doing that all of the time in other languages,
and I am convinced the named loops (not raw labels+gotos, which are
just a necessary evil) are beautiful and clean things.
They have a lot of symmetry, break is always break, not sometimes
break, sometimes return and sometimes raise breakSomeLoopExcept().
Rewriting the simple Fortran example above in Python would be much,
much uglier and more difficult to comprehend.
You always call break and continue with a label, searching for that
label will tell you right away which loop the break breaks.
I am always doing that, even if there is only one loop. break and
continue (without label) are IMO (please no flame war about that)
worse than goto, at least the goto tells you where it goes, with break/
continue you always have to scan the surroundings to find the right
loop.

I know I am not the only one who is trying to solve that problem, I
was hoping someone has come up with a hack to solve it, like this goto
Chis has come up with. I have to play with that a bit.



Dan



From ian.g.kelly at gmail.com  Thu Sep  1 10:26:53 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 08:26:53 -0600
Subject: Why do class methods always need 'self' as the first parameter?
In-Reply-To: <42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
Message-ID: <CALwzidm1P8=9u3iN5iwVTq3TcxfVs3OLiMfo6x2+t0gD=RhESQ@mail.gmail.com>

On Thu, Sep 1, 2011 at 6:45 AM, John Roth <johnroth1 at gmail.com> wrote:
> I personally consider this to be a wart. Some time ago I did an
> implementation analysis. The gist is that, if self and cls were made
> special variables that returned the current instance and class
> respectively, then the compiler could determine whether a function was
> an instance or class method. If it then marked the code object
> appropriately you could get rid of all of the wrappers and the
> attendant run-time overhead.

I don't see how you could get rid of the wrappers.  Methods would
still need to be bound, somehow, so that code like this will work:

methods = {}
for obj in objs:
    if obj.is_flagged:
        methods[obj.user_id] = obj.do_work
    else:
        methods[obj.user_id] = obj.do_other_work
# ...
methods[some_user_id]()

Without method wrappers, how does the interpreter figure out which
instance is bound to the method being called?

Cheers,
Ian


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep  1 10:57:39 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 01 Sep 2011 16:57:39 +0200
Subject: fun with nested loops
In-Reply-To: <a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
Message-ID: <j3o6h5$5ag$1@r03.glglgl.eu>

Am 01.09.2011 16:05 schrieb Daniel:

> In pseudocode it looks like this, I am using @ to give loops a name:
>
> @loop1
> for c in configurations:
>      @loop2
>      while not_done:
>          @loop3
>          while step1_did_not_work:
>              @loop4
>              for substeps in step1 # loop 4a
>                  if hopeless(): continue loop1 # run next configuration
>                  if substepsFailed(): restart loop4 # try again
>                  if substepsWorked(): break loop3 # go on to next
> steps, like loop4

let me have a try:

def loop(f):
     def wrapper(*a, **k):
         while True:
             try:
                 ret = f(*a, **k):
                 return ret
             except wrapper.restart:
                 continue # next try
             except wrapper.stop:
                 return None
             return ret
     wrapper.restart = type('restart', (Exception,), {})
     wrapper.stop = type('stop', (Exception,), {})
     return wrapper




@loop
def level1():
     for c in configurations:
         level2(c)

@loop
def level2():
     while not_done:
         level3()

@loop
def level3():
     while step1_did_not_work:
         level4()

@loop
def level4a():
     for substeps in step1
         if hopeless: raise level2.stop
         if substepsFailed: raise level4a.restart
         if substepsWorked: return ok


I don't know if I have the levels right, but that should be a way which 
works, without too many indentations.

Another approach could be a decorator which immediately runs the given 
functions, after adding the needed exception classes.


Thomas


From as at sci.fi  Thu Sep  1 11:25:30 2011
From: as at sci.fi (Anssi Saari)
Date: Thu, 01 Sep 2011 18:25:30 +0300
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <mailman.644.1314853527.27778.python-list@python.org>
Message-ID: <vg31uw0p9lg.fsf@coffee.modeemi.fi>

Sahil Tandon <sahil at FreeBSD.org> writes:

> I've been tasked with converting some programs from Perl -> Python, and
> am (as will soon be obvious) new to the language. 

If it's any help, I have usually done handling of standard input line by
line with this kind of thing:

for inputline in sys.stdin:


From mukeshtiwari.iiitm at gmail.com  Thu Sep  1 11:46:50 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Thu, 1 Sep 2011 08:46:50 -0700 (PDT)
Subject: Listing HAL devices
Message-ID: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>

Hello all
I am trying to write a python script which detects usb pen drive and
copy all the data into my home directory. After bit of searching , i
found these two links 1] http://en.wikibooks.org/wiki/Python_Programming/Dbus
and 2] http://stackoverflow.com/questions/469243/how-can-i-listen-for-usb-device-inserted-events-in-linux-in-python
. I just copied the wiki program but after running it , i got error

import dbus


class BusListener:
        def __init__( self ):
                self.bus = dbus.SystemBus()
                self.hal_obj =
self.bus.get_object('org.freedesktop.Hal' , '/org/freedesktop/Hal/
Manager' )
                print self.proxy



if __name__ == "__main__":
        obj = BusListener()

Traceback (most recent call last):
  File "Mount.py", line 13, in <module>
    obj = BusListener()
  File "Mount.py", line 7, in __init__
    self.hal_obj = self.bus.get_object('org.freedesktop.Hal' , '/org/
freedesktop/Hal/Manager' )
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 244, in
get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/pymodules/python2.7/dbus/proxies.py", line 241, in
__init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 183, in
activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 281, in
start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/pymodules/python2.7/dbus/connection.py", line 630, in
call_blocking
    message, timeout)
dbus.exceptions.DBusException:
org.freedesktop.DBus.Error.ServiceUnknown: The name
org.freedesktop.Hal was not provided by any .service files

Kindly some one please tell me why i am getting this error .
Thank you


From patentsvnc at gmail.com  Thu Sep  1 11:52:49 2011
From: patentsvnc at gmail.com (Den)
Date: Thu, 1 Sep 2011 08:52:49 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
Message-ID: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>

Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
is handled deep inside the OS, and I'm not trying to interrupt that.
But is there some way to detect that a C-A-D has been pressed?

Also, is there a corresponding key-sequence in Mac and Linux?  And how
might one detect those too?

Den


From mukeshtiwari.iiitm at gmail.com  Thu Sep  1 12:04:29 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Thu, 1 Sep 2011 09:04:29 -0700 (PDT)
Subject: Listing HAL devices
References: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>
Message-ID: <ed2c7683-17bd-480d-80ac-dc2a9fef2506@z1g2000prf.googlegroups.com>

On Sep 1, 8:46?pm, mukesh tiwari <mukeshtiwari.ii... at gmail.com> wrote:
> Hello all
> I am trying to write a python script which detects usb pen drive and
> copy all the data into my home directory. After bit of searching , i
> found these two links 1]http://en.wikibooks.org/wiki/Python_Programming/Dbus
> and 2]http://stackoverflow.com/questions/469243/how-can-i-listen-for-usb-de...
> . I just copied the wiki program but after running it , i got error
>
> import dbus
>
> class BusListener:
> ? ? ? ? def __init__( self ):
> ? ? ? ? ? ? ? ? self.bus = dbus.SystemBus()
> ? ? ? ? ? ? ? ? self.hal_obj =
> self.bus.get_object('org.freedesktop.Hal' , '/org/freedesktop/Hal/
> Manager' )
> ? ? ? ? ? ? ? ? print self.proxy
>
> if __name__ == "__main__":
> ? ? ? ? obj = BusListener()
>
> Traceback (most recent call last):
> ? File "Mount.py", line 13, in <module>
> ? ? obj = BusListener()
> ? File "Mount.py", line 7, in __init__
> ? ? self.hal_obj = self.bus.get_object('org.freedesktop.Hal' , '/org/
> freedesktop/Hal/Manager' )
> ? File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 244, in
> get_object
> ? ? follow_name_owner_changes=follow_name_owner_changes)
> ? File "/usr/lib/pymodules/python2.7/dbus/proxies.py", line 241, in
> __init__
> ? ? self._named_service = conn.activate_name_owner(bus_name)
> ? File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 183, in
> activate_name_owner
> ? ? self.start_service_by_name(bus_name)
> ? File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 281, in
> start_service_by_name
> ? ? 'su', (bus_name, flags)))
> ? File "/usr/lib/pymodules/python2.7/dbus/connection.py", line 630, in
> call_blocking
> ? ? message, timeout)
> dbus.exceptions.DBusException:
> org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.Hal was not provided by any .service files
>
> Kindly some one please tell me why i am getting this error .
> Thank you

I am using Ubuntu 11.04 .


From ansuman.python at gmail.com  Thu Sep  1 12:46:52 2011
From: ansuman.python at gmail.com (Ansuman Bebarta)
Date: Thu, 1 Sep 2011 09:46:52 -0700 (PDT)
Subject: Microphone Input
Message-ID: <3a8e8ad0-5ff8-4236-88b6-73be500e1ad3@p25g2000pri.googlegroups.com>

I want to have a microphone input in a python program on cross
platform. I don't want to use any third party module rather I want to
have a module of my own. Please guide me in this direction.


From ian.g.kelly at gmail.com  Thu Sep  1 13:19:33 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 11:19:33 -0600
Subject: Listing HAL devices
In-Reply-To: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>
References: <781677b3-722d-4c9d-80d6-ca00b0de4abc@r40g2000prf.googlegroups.com>
Message-ID: <CALwzidk1Cg2Dn5XHgSeG3HE27DOF+cX1pv48dco_txbPEd6uNw@mail.gmail.com>

On Thu, Sep 1, 2011 at 9:46 AM, mukesh tiwari
<mukeshtiwari.iiitm at gmail.com> wrote:
> dbus.exceptions.DBusException:
> org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.Hal was not provided by any .service files
>
> Kindly some one please tell me why i am getting this error .
> Thank you

It looks like you don't have HAL installed.  In any case, this is a
Ubuntu / DBus issue, not really a Python issue, so you might find
better support at those fora.

By the way, HAL is deprecated.  I believe current best practice is to
interface with udev directly, but I don't know exactly what that
entails.


From james.thornton at gmail.com  Thu Sep  1 13:58:54 2011
From: james.thornton at gmail.com (JT)
Date: Thu, 1 Sep 2011 10:58:54 -0700 (PDT)
Subject: Help parsing a text file
In-Reply-To: <j3glai$1mu$1@dont-email.me>
References: <j3glai$1mu$1@dont-email.me>
Message-ID: <015c1b3a-947f-4e11-8b1b-6f4ae52c31fd@glegroupsg2000goo.googlegroups.com>

On Monday, August 29, 2011 1:21:48 PM UTC-5, William Gill wrote:
> 
> I have a text file with XML like records that I need to parse.  By XML 
> like I mean records have proper opening and closing tags. but fields 
> don't have closing tags (they rely on line ends).  Not all fields appear 
> in all records, but they do adhere to a defined sequence.

lxml can parse XML and broken HTML (see http://lxml.de/parsing.html).

- James

-- 
Bulbflow: A Python framework for graph databases (http://bulbflow.com)


From nospam at domain.invalid  Thu Sep  1 14:38:09 2011
From: nospam at domain.invalid (William Gill)
Date: Thu, 01 Sep 2011 14:38:09 -0400
Subject: Help parsing a text file
In-Reply-To: <015c1b3a-947f-4e11-8b1b-6f4ae52c31fd@glegroupsg2000goo.googlegroups.com>
References: <j3glai$1mu$1@dont-email.me>
	<015c1b3a-947f-4e11-8b1b-6f4ae52c31fd@glegroupsg2000goo.googlegroups.com>
Message-ID: <j3ojeg$164$1@dont-email.me>

On 9/1/2011 1:58 PM, JT wrote:
> On Monday, August 29, 2011 1:21:48 PM UTC-5, William Gill wrote:
>>
>> I have a text file with XML like records that I need to parse.  By XML
>> like I mean records have proper opening and closing tags. but fields
>> don't have closing tags (they rely on line ends).  Not all fields appear
>> in all records, but they do adhere to a defined sequence.
>
> lxml can parse XML and broken HTML (see http://lxml.de/parsing.html).
>
> - James
>
Thanks to everyone.

Though I didn't get what I expected, it made me think more about the 
reason I need to parse these files to begin with.  So I'm going to do 
some more homework on the overall business application and work backward 
from there. Once I know how the data fits in the scheme of things, I 
will create an appropriate abstraction layer, either from scratch, or 
using one of the existing parsers mentioned, but I won't really know 
that until I have finished modeling.






From tjreedy at udel.edu  Thu Sep  1 14:40:28 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 14:40:28 -0400
Subject: fun with nested loops
In-Reply-To: <a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
Message-ID: <j3ojka$l2h$1@dough.gmane.org>

On 9/1/2011 10:05 AM, Daniel wrote:

You seems to be requesting one of the options in
http://python.org/dev/peps/pep-3136/ Labeled break and continue
(The 'Other languages' section omits Fortran.)

The rejection post is at
http://mail.python.org/pipermail/python-3000/2007-July/008663.html
I basically agree with it.

Your use case seems to be valid, extreme, and rare. You would probably 
use the proposed feature responsibly. But you are not everyone. I am not 
sure what Python-solution I would recommend. I might just stick with 
whatever you are doing that works for your group. However, I can also 
understand the desire to improve.

-- 
Terry Jan Reedy



From pavlovevidence at gmail.com  Thu Sep  1 15:02:45 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 1 Sep 2011 12:02:45 -0700 (PDT)
Subject: fun with nested loops
In-Reply-To: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
Message-ID: <7f43d4ad-fbd7-45f0-bcf5-719e19813429@glegroupsg2000goo.googlegroups.com>

On Wednesday, August 31, 2011 8:51:45 AM UTC-7, Daniel wrote:
> Dear All,
> 
> I have some complicated loops of the following form
> 
> for c in configurations: # loop 1
>     while nothing_bad_happened: # loop 2
>         while step1_did_not_work: # loop 3
>             for substeps in step1 # loop 4a
>                 # at this point, we may have to
>                 -leave loop 1
>                 -restart loop 4
>                 -skip a step in loop 4
>                 -continue on to loop 4b
> 
>         while step2_did_not_work: # loop 4b
>             for substeps in step2:
>                 # at this point, we may have to
>                 -leave loop 1
>                 -restart loop 2
>                 -restart loop 4b
>                 ...
>         ...many more loops...
> 
> 
> I don't see any way to reduce these nested loops logically, they
> describe pretty well what the software has to do.
> This is a data acquisition application, so on ever line there is
> a lot of IO that might fail or make subsequent steps useless or
> require a
> retry.
> 
> Now every step could need to break out of any of the enclosing loops.


I feel your pain.  Every language, even Python, has cases where the trade-offs made in the language design make some legitimate task very difficult.  In such cases I typically throw out the guidebook and make use of whatever shameless Perlesque thing it takes to keep things manageable.

In your example you seem like you're trying to maintain some semblance of structure and good habit; I'd it's probably no longer worth it.  Just store the level to break to in a variable, and after every loop check the variable and break if you need to break further.  Something like this, for example:

break_level = 99
while loop1:
    while loop2:
        while loop3:
            if some_condition:
                break_level = (1, 2, or 3)
                break
        if break_level < 3: break
        break_level = 99
    if break_level < 2: break
    break_level = 99


Carl Banks


From woooee at gmail.com  Thu Sep  1 15:17:37 2011
From: woooee at gmail.com (woooee)
Date: Thu, 1 Sep 2011 12:17:37 -0700 (PDT)
Subject: Text file with mixed end-of-line terminations
References: <4e5e8d71$0$2554$e4fe514c@news2.news.xs4all.nl>
Message-ID: <93d72f06-2e4d-4857-9d9a-f21473ef3267@x11g2000prb.googlegroups.com>

You can use f.read() to read the entire file's contents into a string,
providing the file isn't huge.  Then, split on "\r" and replace "\n"
when found.
A simple test:
input_data = "abc\rdef\rghi\r\njkl\r\nmno\r\n"
first_split = input_data.split("\r")
for rec in first_split:
    rec = rec.replace("\n", "")
    print rec


From aaron.hildebrandt at gmail.com  Thu Sep  1 15:54:02 2011
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Thu, 1 Sep 2011 12:54:02 -0700 (PDT)
Subject: OSX application built with py2app can't see bundled PySide module?
Message-ID: <2e0b44ea-0d71-4c30-8efe-6582cf6923bd@glegroupsg2000goo.googlegroups.com>

I'm trying to deploy a Python app on OSX that was built with PySide. py2app packages it without issue, copying and linking a lot of PySide and Qt files in the process. But then, when I try to run the built app, I get this error:

Traceback (most recent call last):
  File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 31, in <module>
    _run('dailies_v02.py')
  File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 28, in _run
    execfile(path, globals(), globals())
  File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/dailies_v02.py", line 9, in <module>
from PySide.QtCore import *
  File "PySide/__init__.pyc", line 2, in <module>
  File "PySide/private.pyc", line 2, in <module>
  File "PySide/QtCore.pyc", line 18, in <module>
  File "PySide/QtCore.pyc", line 15, in __load
ImportError: '/usr/lib/python2.6/lib-dynload/PySide/QtCore.so' not found

The weird thing is, QtCore.so IS included in the application bundle: py2app copied it to the build under Contents/Resources/lib/python2.6/lib-dynload/PySide/. Is there a reason the application isn't seeing this?


From false at pp.jaring.my  Thu Sep  1 17:12:44 2011
From: false at pp.jaring.my (Fulvio)
Date: Fri, 02 Sep 2011 05:12:44 +0800
Subject: Optparse buggy?
Message-ID: <j3osg8$fq8$1@speranza.aioe.org>

Hello,

I'm on python3.2, trying some experiment with OptionParser but no success

>>> from optparse import OptionParser as parser
>>> parser.add_option('-n','--new', dest='new')                                                                                             
Traceback (most recent call last):                                                                                                          
  File "<stdin>", line 1, in <module>                                                                                                       
  File "/usr/lib/python3.2/optparse.py", line 1001, in add_option                                                                           
    option = self.option_class(*args, **kwargs)                                                                                             
AttributeError: 'str' object has no attribute 'option_class'                                                                                
>>>                                                                                                                                     

Any futher item in the option won't make any better.
-- 
Archlinux on $(uname -a) :P



From mydevgroup at gmail.com  Thu Sep  1 17:14:23 2011
From: mydevgroup at gmail.com (George)
Date: Thu, 01 Sep 2011 22:14:23 +0100
Subject: Python thread
Message-ID: <CA85B43F.874C%mydevgroup@gmail.com>

Hi,
Why doesn't python threads show an associated PID?  On spawning python
threads using the threading module I can only see the main thread's pid on
using top or ps unix command, no  subprocesses are displayed. In otherwords
top or ps in not aware of any subprocesses created using threading module in
python. 

Whereas in Java , creating threads will result in separate pid , these
subprocesses can be listed using top or ps. Java threads get mapped to the
cores in the system.
  
Does it mean that python threads are not mapped to the core in the system.
On using multiprocessing module, separate processes are created with unique
PID. 


Any input would be great
George




From ian.g.kelly at gmail.com  Thu Sep  1 17:24:33 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 1 Sep 2011 15:24:33 -0600
Subject: Optparse buggy?
In-Reply-To: <j3osg8$fq8$1@speranza.aioe.org>
References: <j3osg8$fq8$1@speranza.aioe.org>
Message-ID: <CALwzidngyoYVLMg94VJpjPMWx8GmMOEjwSFSQ2tZ5J47tuVecg@mail.gmail.com>

On Thu, Sep 1, 2011 at 3:12 PM, Fulvio <false at pp.jaring.my> wrote:
> Hello,
>
> I'm on python3.2, trying some experiment with OptionParser but no success
>
>>>> from optparse import OptionParser as parser
>>>> parser.add_option('-n','--new', dest='new')
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "/usr/lib/python3.2/optparse.py", line 1001, in add_option
> ? ?option = self.option_class(*args, **kwargs)
> AttributeError: 'str' object has no attribute 'option_class'
>>>>
>
> Any futher item in the option won't make any better.

You're trying to call the method from the OptionParser class -- you
need to instantiate it first.

from optparse import OptionParser
parser = OptionParser()
parser.add_option('-n', '--new', dest='new')
...

Cheers,
Ian


From jason.swails at gmail.com  Thu Sep  1 17:27:25 2011
From: jason.swails at gmail.com (Jason Swails)
Date: Thu, 1 Sep 2011 17:27:25 -0400
Subject: Optparse buggy?
In-Reply-To: <j3osg8$fq8$1@speranza.aioe.org>
References: <j3osg8$fq8$1@speranza.aioe.org>
Message-ID: <CAEk9e3q-OD5Rog-wkoAOsm7o7=iLwR7ALTKd4ZqyVUL72=g7DQ@mail.gmail.com>

On Thu, Sep 1, 2011 at 5:12 PM, Fulvio <false at pp.jaring.my> wrote:

> Hello,
>
> I'm on python3.2, trying some experiment with OptionParser but no success
>
> >>> from optparse import OptionParser as parser
> >>> parser.add_option('-n','--new', dest='new')
>

Here you've imported parser as an alias to the OptionParser class.  You can
only use add_option() on an instance of that class.  Try this:

from optparse import OptionParser

parser = OptionParser()
parser.add_option('-n','--new',dest='new')

However, I think argparse has replaced optparse since Python 2.7 and
higher...

HTH,
Jason
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From mydevgroup at gmail.com  Thu Sep  1 17:41:13 2011
From: mydevgroup at gmail.com (George)
Date: Thu, 01 Sep 2011 22:41:13 +0100
Subject: PythonThreading
Message-ID: <CA85BA89.88B9%mydevgroup@gmail.com>

Hi,
Why doesn't python threads show an associated PID?  On spawning python
threads using the threading module I can only see the main thread's pid on
using top or ps unix command, no  subprocesses are displayed. In otherwords
top or ps in not aware of any subprocesses created using threading module in
python.

Whereas in Java , creating threads will result in separate pid , these
subprocesses can be listed using top or ps. Java threads get mapped to the
cores in the system.

Does it mean that python threads are not mapped to the core in the system.
On using multiprocessing module, separate processes are created with unique
PID.


Any input would be great
George




From mydevgroup at gmail.com  Thu Sep  1 17:45:11 2011
From: mydevgroup at gmail.com (George Kovoor)
Date: Thu, 1 Sep 2011 22:45:11 +0100
Subject: Threads in Python
Message-ID: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>

Hi,
Why doesn't python threads show an associated PID?  On spawning python
threads using the threading module I can only see the main thread's pid on
using top or ps unix command, no  subprocesses are displayed. In otherwords
top or ps in not aware of any subprocesses created using threading module in
python.

Whereas in Java , creating threads will result in separate pid , these
subprocesses can be listed using top or ps. Java threads get mapped to the
cores in the system.

Does it mean that python threads are not mapped to the core in the system.
On using multiprocessing module, separate processes are created with unique
PID.


Any input would be great
George
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From tjreedy at udel.edu  Thu Sep  1 17:51:32 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 17:51:32 -0400
Subject: Optparse buggy?
In-Reply-To: <j3osg8$fq8$1@speranza.aioe.org>
References: <j3osg8$fq8$1@speranza.aioe.org>
Message-ID: <j3ouqi$2t3$1@dough.gmane.org>

On 9/1/2011 5:12 PM, Fulvio wrote:

> I'm on python3.2, trying some experiment with OptionParser but no success

Do note "The optparse module is deprecated and will not be developed 
further; development will continue with the argparse module."

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Thu Sep  1 17:54:37 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 17:54:37 -0400
Subject: Python thread
In-Reply-To: <CA85B43F.874C%mydevgroup@gmail.com>
References: <CA85B43F.874C%mydevgroup@gmail.com>
Message-ID: <j3ov0b$40l$1@dough.gmane.org>

On 9/1/2011 5:14 PM, George wrote:
> Hi,
> Why doesn't python threads show an associated PID?  On spawning python
> threads using the threading module I can only see the main thread's pid on
> using top or ps unix command, no  subprocesses are displayed. In otherwords
> top or ps in not aware of any subprocesses created using threading module in
> python.

Perhaps because threads are not subprocesses?

> Whereas in Java , creating threads will result in separate pid , these
> subprocesses can be listed using top or ps. Java threads get mapped to the
> cores in the system.
>
> Does it mean that python threads are not mapped to the core in the system.

They all run on the same core.

> On using multiprocessing module, separate processes are created with unique
> PID.

That is why multiprocessing was added.


-- 
Terry Jan Reedy



From mydevgroup at gmail.com  Thu Sep  1 18:08:01 2011
From: mydevgroup at gmail.com (George)
Date: Thu, 01 Sep 2011 23:08:01 +0100
Subject: Python thread
In-Reply-To: <j3ov0b$40l$1@dough.gmane.org>
Message-ID: <CA85C0D1.88C3%mydevgroup@gmail.com>

So what exactly does threading module do, if it doesn't create a subprocess.
Does each thread have its own stack and PC.
What advantage would a threading module provide over sequential execution.


On 01/09/2011 22:54, "Terry Reedy" <tjreedy at udel.edu> wrote:

> On 9/1/2011 5:14 PM, George wrote:
>> Hi,
>> Why doesn't python threads show an associated PID?  On spawning python
>> threads using the threading module I can only see the main thread's pid on
>> using top or ps unix command, no  subprocesses are displayed. In otherwords
>> top or ps in not aware of any subprocesses created using threading module in
>> python.
> 
> Perhaps because threads are not subprocesses?
> 
>> Whereas in Java , creating threads will result in separate pid , these
>> subprocesses can be listed using top or ps. Java threads get mapped to the
>> cores in the system.
>> 
>> Does it mean that python threads are not mapped to the core in the system.
> 
> They all run on the same core.
> 
>> On using multiprocessing module, separate processes are created with unique
>> PID.
> 
> That is why multiprocessing was added.
> 




From ramit.prasad at jpmorgan.com  Thu Sep  1 18:21:37 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 1 Sep 2011 18:21:37 -0400
Subject: Python thread
In-Reply-To: <CA85C0D1.88C3%mydevgroup@gmail.com>
References: <j3ov0b$40l$1@dough.gmane.org> <CA85C0D1.88C3%mydevgroup@gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>

>So what exactly does threading module do, if it doesn't create a subprocess.
>Does each thread have its own stack and PC.
>What advantage would a threading module provide over sequential execution.

I believe it merely simulates multiple processes through scheduling (like the CPU).

From http://docs.python.org/library/threading.html: CPython implementation detail: Due to the Global Interpreter Lock, in CPython only one thread can execute Python code at once (even though certain performance-oriented libraries might overcome this limitation). If you want your application to make better of use of the computational resources of multi-core machines, you are advised to use multiprocessing. However, threading is still an appropriate model if you want to run multiple I/O-bound tasks simultaneously.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423




This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From me+list/python at ixokai.io  Thu Sep  1 18:27:32 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Thu, 01 Sep 2011 15:27:32 -0700
Subject: Threads in Python
In-Reply-To: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>
References: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>
Message-ID: <4E6006D4.9080106@ixokai.io>

On 9/1/11 2:45 PM, George Kovoor wrote:
> Hi,
> Why doesn't python threads show an associated PID?  On spawning python
> threads using the threading module I can only see the main thread's pid on
> using top or ps unix command, no  subprocesses are displayed. In otherwords
> top or ps in not aware of any subprocesses created using threading module in
> python.
>
> Whereas in Java , creating threads will result in separate pid , these
> subprocesses can be listed using top or ps. Java threads get mapped to the
> cores in the system.

I think you're confused about what threads and subprocesses are. They
are completely different mechanisms for concurrent code. Threads never
show up on top or ps, in any language ... or the language isn't offering
threads. I don't know Java, so I can't really comment on it much, but it
may be misusing the 'thread' word, but I somehow doubt it. I suspect
you're just mistaken about what Java is offering.

Threads are separate operating ..er, chains-of-instructions within a
single process... Notably with threads, they share the same address
space so you can easily share objects amongst threads, without any
copying and with no overhead ... Also notably with threads, this can be
dangerous, so you often end up wrapping lots of locks around those
shared objects and have to take extreme care to make sure nothing goes
haywire.

Subprocesses are different; they are a whole, separate process with its
own address space and no shared memory (unless you go out of your way to
do it manually). Heck, each subprocess can have any number of threads.
Anything you want to share between them you have to take special care to
set up and do -- multiprocessing exists to make this easier and make
subprocesses easier to use, like threads are.

They're very distinct. Threads are a lot more lightweight and start up a
lot faster, but doing multithreaded programming right with any sort of
shared objects is really, really, really hard to get right. Some say you
can't.

But, in Python, only one thread actually ever executes actual Python
code at any given time. This does not actually make threading useless as
some people claim; if you're making a lot of calls into C-code, for
instance, the lock gets released while said C-code runs and other Python
code can continue along. Its just not useful if your program is
CPU-bound and wants to take advantage of multiple cores. But there's
lots of other reasons to go concurrent.

But if you do need lots of CPU power, multiprocessing lets you chew up
multiple cores and does so /fairly/ easily. Communication between the
processes can be expensive depending on the types of objects you need to
pass back and forth, but it depends on how you're designing your app.

They're just different ways of achieving concurrency, and the two
primary ways Python provides. (Greenlets is another, available as a
third-party module; Twisted's asynch dispatching isn't really exactly
concurrency, but it does a better job then concurrency does for some
operations; someone's always working on coroutines in some fashion or
another, which is another kind of concurrency.)

Lots of different ways to go concurrent, depending on your needs.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

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From cs at zip.com.au  Thu Sep  1 18:43:01 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 2 Sep 2011 08:43:01 +1000
Subject: Threads in Python
In-Reply-To: <4E6006D4.9080106@ixokai.io>
References: <4E6006D4.9080106@ixokai.io>
Message-ID: <20110901224301.GA8878@cskk.homeip.net>

On 01Sep2011 15:27, Stephen Hansen <me+list/python at ixokai.io> wrote:
| On 9/1/11 2:45 PM, George Kovoor wrote:
| > Why doesn't python threads show an associated PID?  On spawning python
| > threads using the threading module I can only see the main thread's pid on
| > using top or ps unix command, no  subprocesses are displayed. In otherwords
| > top or ps in not aware of any subprocesses created using threading module in
| > python.
| >
| > Whereas in Java , creating threads will result in separate pid , these
| > subprocesses can be listed using top or ps. Java threads get mapped to the
| > cores in the system.
| 
| I think you're confused about what threads and subprocesses are. They
| are completely different mechanisms for concurrent code. Threads never
| show up on top or ps, in any language ... or the language isn't offering
| threads. I don't know Java, so I can't really comment on it much, but it
| may be misusing the 'thread' word, but I somehow doubt it. I suspect
| you're just mistaken about what Java is offering.

No, you're mistaken about the threading models on offer.

Some systems offer a threading model where threads can have distinct
process ids; the only real criterion is that they share the same address
space.

The advantages of separate process ids for threads include letting
the OS arrange their scheduling, delivery of signals (on UNIX systems)
to a particular thread, ability to use multiple cores. On the flipside,
threads with distinct process ids tend to be more expensive to set up
and may be more expensive in thread switching.

Java has long shipped with multiple threading implementations; IIRC
"green threads" is an "all in one process id" model that can be used on
any platform.

Some use a mix of heavyweight (threads with distinct pids) and
lightweight threads.

| But, in Python, only one thread actually ever executes actual Python
| code at any given time.

In CPython this is true. Other implementations like Jython can use
other threading models; I'd expect Jython to take a lot of advantage of
Java's native threads.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Seeing my great fault
Through darkening blue windows
I begin again
- Haiku Error Messages http://www.salonmagazine.com/21st/chal/1998/02/10chal2.html


From benjamin.kaplan at case.edu  Thu Sep  1 18:46:32 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 1 Sep 2011 18:46:32 -0400
Subject: Python thread
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>
References: <j3ov0b$40l$1@dough.gmane.org> <CA85C0D1.88C3%mydevgroup@gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAMuTYXgQy1qZrJxRywkvPMxwCHXWnLLmBKNbm+=E2je-NKwAFA@mail.gmail.com>

On Thu, Sep 1, 2011 at 6:21 PM, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>So what exactly does threading module do, if it doesn't create a subprocess.
>>Does each thread have its own stack and PC.
>>What advantage would a threading module provide over sequential execution.
>
> I believe it merely simulates multiple processes through scheduling (like the CPU).
>
> >From http://docs.python.org/library/threading.html: CPython implementation detail: Due to the Global Interpreter Lock, in CPython only one thread can execute Python code at once (even though certain performance-oriented libraries might overcome this limitation). If you want your application to make better of use of the computational resources of multi-core machines, you are advised to use multiprocessing. However, threading is still an appropriate model if you want to run multiple I/O-bound tasks simultaneously.
>
> Ramit

Threading is an OS-level construct to allow concurrency within a
single process (and address space). Threads are never supposed to be
separate processes (they aren't at the C-level, so I don't know what
Java is doing here). CPython code has a global interpreter lock which
prevents two threads from running Python code at the same time, but
they're still useful for asynchronous operations. For example, one
thread can be waiting for user input while another thread continues to
process data. Other Python implementations such as Jython and
IronPython don't have a global interpreter lock so threads can run
concurrently (and on different cores in a multi-core machine).

> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
>
>
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available at http://www.jpmorgan.com/pages/disclosures/email.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tjreedy at udel.edu  Thu Sep  1 19:02:17 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 19:02:17 -0400
Subject: Python thread
In-Reply-To: <CA85C0D1.88C3%mydevgroup@gmail.com>
References: <j3ov0b$40l$1@dough.gmane.org> <CA85C0D1.88C3%mydevgroup@gmail.com>
Message-ID: <j3p2v7$qiq$1@dough.gmane.org>

On 9/1/2011 6:08 PM, George wrote:
> So what exactly does threading module do, if it doesn't create a subprocess.
> Does each thread have its own stack and PC.
> What advantage would a threading module provide over sequential execution.

https://secure.wikimedia.org/wikipedia/en/wiki/Thread_%28computer_science%29

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Thu Sep  1 19:06:16 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 01 Sep 2011 19:06:16 -0400
Subject: PythonThreading
In-Reply-To: <CA85BA89.88B9%mydevgroup@gmail.com>
References: <CA85BA89.88B9%mydevgroup@gmail.com>
Message-ID: <j3p36m$qiq$2@dough.gmane.org>

Please do not repeatedly post the same thing. Doing so, with different 
titles, will only annoy people. It takes awhile for a post to show up 
with whatever news or mail reader you are using.

-- 
Terry Jan Reedy



From lists at cheimes.de  Thu Sep  1 19:09:51 2011
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 02 Sep 2011 01:09:51 +0200
Subject: Python thread
In-Reply-To: <CAMuTYXgQy1qZrJxRywkvPMxwCHXWnLLmBKNbm+=E2je-NKwAFA@mail.gmail.com>
References: <j3ov0b$40l$1@dough.gmane.org>
	<CA85C0D1.88C3%mydevgroup@gmail.com>	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F165DD74C@EMARC112VS01.exchad.jpmchase.net>
	<CAMuTYXgQy1qZrJxRywkvPMxwCHXWnLLmBKNbm+=E2je-NKwAFA@mail.gmail.com>
Message-ID: <j3p3bv$tbs$1@dough.gmane.org>

Am 02.09.2011 00:46, schrieb Benjamin Kaplan:
> Threading is an OS-level construct to allow concurrency within a
> single process (and address space). Threads are never supposed to be
> separate processes (they aren't at the C-level, so I don't know what
> Java is doing here). CPython code has a global interpreter lock which
> prevents two threads from running Python code at the same time, but
> they're still useful for asynchronous operations. For example, one
> thread can be waiting for user input while another thread continues to
> process data. Other Python implementations such as Jython and
> IronPython don't have a global interpreter lock so threads can run
> concurrently (and on different cores in a multi-core machine).

On Linux threading is implemented with multiple processes. A Linux
pthread is a clone of the process created with the clone(2) syscall. [1]
Each thread has a PID and an entry in the kernel's process table. Tools
like htop can show user land threads as different processes. This may
explain the confusion of the OP. He may have seen multiple Java threads
as different processes.

psutil can list all threads with PIDs. The getpid(2) syscall returns
always the PID of the main process, gettid (only available through
syscall(SYS_gettid)) returns the PID of the current thread.

Christian

[1] http://linux.die.net/man/2/clone



From nobody at nowhere.com  Thu Sep  1 20:10:14 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 02 Sep 2011 01:10:14 +0100
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <pan.2011.09.02.00.10.14.153000@nowhere.com>

On Thu, 01 Sep 2011 08:52:49 -0700, Den wrote:

> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?

Not reliably. You might infer that Ctrl-Alt-Del has been used by the way
that certain operations behave, but that's fairly error-prone.

> Also, is there a corresponding key-sequence in Mac and Linux?  And how
> might one detect those too?

I don't know about Mac. Linux has some support for Ctrl-Alt-Del on the
console, and the optional "Magic SysRq" feature. But there's no easy way
to detect these (if the sequence is recognised by the kernel, it's not
reported by the usual mechanisms).



From dalist0 at gmail.com  Thu Sep  1 20:21:33 2011
From: dalist0 at gmail.com (Daniel)
Date: Thu, 1 Sep 2011 17:21:33 -0700 (PDT)
Subject: fun with nested loops
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<7f43d4ad-fbd7-45f0-bcf5-719e19813429@glegroupsg2000goo.googlegroups.com>
Message-ID: <e04c74e8-d4cb-4aeb-9d2c-8cccd785ebcf@g9g2000yqb.googlegroups.com>

I thought a bit about Carl's and Thomas' proposals, and it gave me an
idea how this problem could be approached:
Break is relatively easy to implement with a context manager that
returns an iterable that throws an exception specific to that context
manager:

with named_loop(i for i in range(10)) as loop1:
    for i in loop1:
        with named_loop(i for i in range(10)) as loop2a:
            for j in loop2a:
                loop1._break() # this is easy
                loop1._continue() # this is difficult
                # if we _continue here, we need to do a continue right
after the with loop2a:
        if loop1.cont: continue # context manager does not create new
scope

        with named_loop(i for i in range(10)) as loop2b:
            for j in loop2b:
                loop1._break()

this throws an exception that propagates through all the context
managers till it hits the one that made loop1
at that point the exception is caught.

Now using the idea of break_levels, something like loop1._continue()
should work.
It is more difficult, because it should be caught in the last loop
before the one that is targeted,
loop1._continue throws an exception that is caught in loop2. Then
loop1 just continues with the next value.

I don't know how loop2 can learn that it is enclosed in loop1. Maybe
loop1 could add itself to a global stack on enter
and delete itself on exit, or maybe inspect could help?

The big problem is that loop1._continue breaks out of loop2a, but then
starts to execute loop2b, which we don't want.
If loop1 is _continued inside of loop2a, a continue needs to directly
follow the loop2a with block.

An alternative would be to wrap each sequence of statements in another
with statement, I think this is better:

for i in loop1:
    with sequenced_stuff():
        with named_loop(i for i in range(10)) as loop2a:
            for j in loop2a:
                loop1._continue() # this is caught in
sequenced_stuff()

        with named_loop(i for i in range(10)) as loop2b:
            for j in loop2b:
                loop1._break()


Loops can even be restarted with a small modification:
In a loop like "for i in loop1:" the __iter__ method of loop1 is
called. If __iter__ returns a smart iterator that keeps a reference to
loop1, then it can be restarted, advanced etc.
loop1.restart() would throw an exception that __exits__ all the inner
loops and gets caught in the loop just before loop1. Then it resets
the iterable that the iterator returned by __iter__ links to, i.e.
loop1 restarts.
Nice side benefit: loops can have a method peek(n) to look ahead.

Thanks for all your input,

Dan





From bkasterm at gmail.com  Thu Sep  1 20:35:10 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Thu, 01 Sep 2011 18:35:10 -0600
Subject: List comprehension timing difference.
Message-ID: <87zkinkcht.fsf@gmail.com>


In the following code I create the graph with vertices
sgb-words.txt (the file of 5 letter words from the
stanford graphbase), and an edge if two words differ 
by one letter.  The two methods I wrote seem to me to 
likely perform the same computations, the list comprehension 
is faster though (281 seconds VS 305 seconds on my dell mini).

Is the right interpretation of this timing difference
that the comprehension is performed in the lower level
C code?

As this time I have no other conjecture about the cause.

---------------------------------------------------------
import time
import copy

data = map (lambda x: x.strip(), open('sgb-words.txt').readlines())

def d (w1, w2):
    count = 0
    for idx in range(0,5):
        if w1[idx] != w2[idx]:
            count += 1
    return count

print "creating graph"
t0 = time.clock ()
graph = [[a,b] for a in data for b in data if d(a,b) ==1 and a < b]
t1 = time.clock ()
print "took " + str (t1 - t0) + " seconds."

t0 = time.clock ()
graph2 = []
for i in range (0, len(data)):
    for j in range(0,len(data)):
        if d(data[i],data[j]) == 1 and i < j:
            graph2.append ([i,j])
t1 = time.clock ()
print "took " + str (t1 - t0) + " seconds."


From steve+comp.lang.python at pearwood.info  Thu Sep  1 21:04:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 02 Sep 2011 11:04:01 +1000
Subject: fun with nested loops
References: <e544c1e4-7d5e-4688-bd92-dbb2cd4c179f@k9g2000vbd.googlegroups.com>
	<e314b23a-f430-43e1-a36d-17e5285629cd@d7g2000vbv.googlegroups.com>
	<9dc99e77-af2e-4d28-b563-e1a66236318e@er4g2000vbb.googlegroups.com>
	<4e5ecdcf$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<4e5ed6ef$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<a929cbc5-696e-45c1-8eff-6428a7e7af18@ea4g2000vbb.googlegroups.com>
Message-ID: <4e602b81$0$29985$c3e8da3$5496439d@news.astraweb.com>

Daniel wrote:

> That's the form the specification is in, and it makes sense and is
> very readable.
> In pseudocode it looks like this, I am using @ to give loops a name:
> 
> @loop1
> for c in configurations:
>     @loop2
>     while not_done:
>         @loop3
>         while step1_did_not_work:
>             @loop4
>             for substeps in step1 # loop 4a
>                 if hopeless(): continue loop1 # run next configuration
>                 if substepsFailed(): restart loop4 # try again
>                 if substepsWorked(): break loop3 # go on to next
> steps, like loop4
> 
> That format is fine, everyone involved can understand it, even the
> people in charge.

Well good for them, because I sure as hell don't understand it. To me,
that's exactly the sort of thing that Guido was worried about when he
rejected the idea of named labels. I'd need to sit down and trace a few
loops by hand to grasp it. I wonder how new people coming into the project
find it?

Personally, I consider two nested loops right on the boundary of my "magic
number seven, plus or minus two" short term memory[1]. I prefer to chunk
code into functions so that I can ignore details of the inner loops while
reasoning about the outer loops, and vice versa. If you feel different,
then I'm not being sarcastic when I say "good for you".

If you require a 1:1 correspondence between your code and your pseudo-code
specification, then maybe Python isn't the right language for this task.

Ruby is very Python-like, and has labelled loops. Perl and PHP less so, but
can also be quite readable with some discipline. You could also check out
Cobra -- their website is down just at the moment, so I can't check whether
it has labelled loops.

http://cobra-language.com/



[1] Not really magic, and probably more like 4?2.


-- 
Steven



From python at mrabarnett.plus.com  Thu Sep  1 21:12:47 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 02 Sep 2011 02:12:47 +0100
Subject: List comprehension timing difference.
In-Reply-To: <87zkinkcht.fsf@gmail.com>
References: <87zkinkcht.fsf@gmail.com>
Message-ID: <4E602D8F.4090408@mrabarnett.plus.com>

On 02/09/2011 01:35, Bart Kastermans wrote:
>
> In the following code I create the graph with vertices
> sgb-words.txt (the file of 5 letter words from the
> stanford graphbase), and an edge if two words differ
> by one letter.  The two methods I wrote seem to me to
> likely perform the same computations, the list comprehension
> is faster though (281 seconds VS 305 seconds on my dell mini).
>
> Is the right interpretation of this timing difference
> that the comprehension is performed in the lower level
> C code?
>
> As this time I have no other conjecture about the cause.
>
> ---------------------------------------------------------
> import time
> import copy
>
> data = map (lambda x: x.strip(), open('sgb-words.txt').readlines())
>
> def d (w1, w2):
>      count = 0
>      for idx in range(0,5):
>          if w1[idx] != w2[idx]:
>              count += 1
>      return count
>
> print "creating graph"
> t0 = time.clock ()
> graph = [[a,b] for a in data for b in data if d(a,b) ==1 and a<  b]
> t1 = time.clock ()
> print "took " + str (t1 - t0) + " seconds."
>
> t0 = time.clock ()
> graph2 = []
> for i in range (0, len(data)):
>      for j in range(0,len(data)):
>          if d(data[i],data[j]) == 1 and i<  j:
>              graph2.append ([i,j])
> t1 = time.clock ()
> print "took " + str (t1 - t0) + " seconds."

Are they actually equivalent? Does graph == graph2?

The first version (list comprehension) creates a list of pairs of
values:

     [a, b]

whereas the second version (for loops) creates a list of pairs of
indexes:

     [i, j]

The second version has subscripting ("data[i]" and "data[j]"), which
will slow it down.


From rtomek at ceti.com.pl  Thu Sep  1 21:53:07 2011
From: rtomek at ceti.com.pl (Tomasz Rola)
Date: Fri, 2 Sep 2011 03:53:07 +0200 (CEST)
Subject: slightly OT -- LaTeX
In-Reply-To: <4E60379F.4000702@stoneleaf.us>
References: <4E60379F.4000702@stoneleaf.us>
Message-ID: <Pine.LNX.4.64.1109020349250.17864@tau.ceti.pl>

On Thu, 1 Sep 2011, Ethan Furman wrote:

> I asked a question a couple weeks ago about scripting WordPerfect with Python,
> and a couple respondents suggested LaTeX was very good.  Where would I start
> if I wanted to learn about it?
> 
> ~Ethan~

1. Leslie Lamport, "LaTeX: A Document Preparation System" - I have used 
it, learning LaTeX in front of a computer, as I wrote my first document in 
it. I guess this is a very good book on the subject but I have never tried 
anything else.

2. http://www.latex-project.org/
   http://www.latex-project.org/guides/
   http://www.ctan.org/

Regards,
Tomasz Rola

--
** A C programmer asked whether computer had Buddha's nature.      **
** As the answer, master did "rm -rif" on the programmer's home    **
** directory. And then the C programmer became enlightened...      **
**                                                                 **
** Tomasz Rola          mailto:tomasz_rola at bigfoot.com             **


From ethan at stoneleaf.us  Thu Sep  1 21:55:43 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 01 Sep 2011 18:55:43 -0700
Subject: slightly OT -- LaTeX
Message-ID: <4E60379F.4000702@stoneleaf.us>

I asked a question a couple weeks ago about scripting WordPerfect with 
Python, and a couple respondents suggested LaTeX was very good.  Where 
would I start if I wanted to learn about it?

~Ethan~


From sahil at FreeBSD.org  Thu Sep  1 22:02:54 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Thu, 01 Sep 2011 22:02:54 -0400
Subject: idiomatic analogue of Perl's: while (<>) { ... }
In-Reply-To: <4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.644.1314853527.27778.python-list@python.org>
	<4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E60394E.2080708@FreeBSD.org>

[Thanks to everyone who responded]

Steven D'Aprano wrote:
> On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:
>> %%
>> # unbuffer STDOUT
>> sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
>
> I've never bothered with unbuffered stdout, but that looks fine to me.
>
> I'm not sure if it is necessary though, because print seems to automatically
> flush the buffer after each line in my testing. Unless you're printing
> repeatedly to the same line, I'm not sure unbuffered stdout is helpful.

I found it necessary because without reopening sys.stdout with buffering 
explicitly turned off, I would have to manually flush the buffer after 
each print.  This is because the program must reply (via writing to 
STDOUT) after parsing each line read via STDIN.  If I neither disable 
buffering nor manually flush after each print, the program just hangs 
instead of printing right away.

>> # process input, line-by-line, and print responses after parsing input
>> while 1:
>>    rval = parse(raw_input())
>>    if rval == None:
>>      print('foo')
>>    else:
>>      print('bar')
>> %%
>
> "while True" is considered slightly more idiomatic (readable), but
> otherwise, that seems fine.

Ah, thanks -- I've changed '1' to 'True'.

>> This works, but while reading the documentation, I thought of using 'for
>> line in fileinput.input()' in lieu of 'while 1:' construct.  This does
>> not work when debugging the program on the command line -- the script
>> appears to just hang no matter what is typed into STDIN.  I believe this
>> is because of some internal buffering when using fileinput.  Is there a
>> recommended way to disable such buffering?  Am I taking a totally wrong
>> approach?
>
> I'm not sure anything about fileinput is exactly *recommended*, it's kinda
> discouraged on account of being a bit slow. See help(fileinput) at the
> interactive prompt.
>
> For what it's worth, the default buffersize for fileinput.input is 0, so if
> that doesn't do what you want, I don't think fileinput is the right
> solution.

Got it.  Based on your and others' response, I will stick with my 
existing approach.

-- 
Sahil Tandon <sahil at FreeBSD.org>



From ben+python at benfinney.id.au  Thu Sep  1 22:11:23 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 02 Sep 2011 12:11:23 +1000
Subject: slightly OT -- LaTeX
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <8762lbsng4.fsf@benfinney.id.au>

Ethan Furman <ethan at stoneleaf.us> writes:

> I asked a question a couple weeks ago about scripting WordPerfect with
> Python, and a couple respondents suggested LaTeX was very good.

Someone (you, or the respondents, or some combination of those) has
omitted a few steps there, and what you've said here has become a non
sequitur: I can't see the path you've taken from ?scripting WordPerfect
with Python? to ?LaTeX?.

How does this relate to Python? (If it relates only to WordPerfect or
LaTeX, you're in the wrong forum, so I assume there must be some
particular relevance to Python.)

> Where would I start if I wanted to learn about it?

About LaTeX? <URL:http://www.latex-project.org/> seems the obvious
answer.

If you want something more specific, please be more specific with the
question.

-- 
 \          ?Now Maggie, I?ll be watching you too, in case God is busy |
  `\       creating tornadoes or not existing.? ?Homer, _The Simpsons_ |
_o__)                                                                  |
Ben Finney


From false at pp.jaring.my  Thu Sep  1 22:11:55 2011
From: false at pp.jaring.my (Fulvio)
Date: Fri, 02 Sep 2011 10:11:55 +0800
Subject: Optparse buggy?
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
Message-ID: <j3pe1q$o67$1@speranza.aioe.org>

Terry Reedy wrote:

> Do note "The optparse module is deprecated and will not be developed
> further; development will continue with the argparse module."

Then,do you propose me to opt to argparse?

-- 
Archlinux on $(uname -a) :P
F


From roy at panix.com  Thu Sep  1 22:16:13 2011
From: roy at panix.com (Roy Smith)
Date: Thu, 01 Sep 2011 22:16:13 -0400
Subject: Optparse buggy?
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
Message-ID: <roy-CFA28A.22161301092011@news.panix.com>

In article <mailman.666.1314913951.27778.python-list at python.org>,
 Terry Reedy <tjreedy at udel.edu> wrote:

> Do note "The optparse module is deprecated and will not be developed 
> further; development will continue with the argparse module."

One of the unfortunate things about optparse and argparse is the names.  
I can never remember which is the new one and which is the old one.  It 
would have been a lot simpler if the new one had been named optparse2 
(in the style of unittest2 and urllib2).


From ben+python at benfinney.id.au  Thu Sep  1 22:18:19 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 02 Sep 2011 12:18:19 +1000
Subject: Optparse buggy?
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
	<j3pe1q$o67$1@speranza.aioe.org>
Message-ID: <871uvzsn4k.fsf@benfinney.id.au>

Fulvio <false at pp.jaring.my> writes:

> Terry Reedy wrote:
>
> > Do note "The optparse module is deprecated and will not be developed
> > further; development will continue with the argparse module."
>
> Then,do you propose me to opt to argparse?

Without argument, yes; though for now it is opt-in.

-- 
 \     ?We are no more free to believe whatever we want about God than |
  `\         we are free to adopt unjustified beliefs about science or |
_o__)              history [?].? ?Sam Harris, _The End of Faith_, 2004 |
Ben Finney


From askutt at gmail.com  Thu Sep  1 22:25:22 2011
From: askutt at gmail.com (Adam Skutt)
Date: Thu, 1 Sep 2011 19:25:22 -0700 (PDT)
Subject: Python thread
References: <mailman.661.1314911668.27778.python-list@python.org>
Message-ID: <cdc08977-7dfc-4282-9792-072edd140853@q2g2000vbz.googlegroups.com>

On Sep 1, 5:14?pm, George <mydevgr... at gmail.com> wrote:
> Hi,
> Why doesn't python threads show an associated PID? ?On spawning python
> threads using the threading module I can only see the main thread's pid on
> using top or ps unix command, no ?subprocesses are displayed. In otherwords
> top or ps in not aware of any subprocesses created using threading module in
> python.

You probably need to run 'ps axm' or something similar to see to
threads associated with a processes on your system.

>
> Whereas in Java , creating threads will result in separate pid , these
> subprocesses can be listed using top or ps. Java threads get mapped to the
> cores in the system.

No.  It depends on your runtime, but if Java uses native threads, it
will have the same behavior as Python here. It also doesn't mean they
get mapped to cores in the system.  All it means is the operating
system is responsible for scheduling the threads and managing their
lifecycle.

Adam


From gagsl-py2 at yahoo.com.ar  Thu Sep  1 22:26:54 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 01 Sep 2011 23:26:54 -0300
Subject: Calling Script from Command line not working
References: <CADBb1sdSMyiEKSaxPgScE_sCobpcVkFjuEJP0iFJ_KJJPFnQGg@mail.gmail.com>
Message-ID: <op.v05s24u3x6zn5v@lepton>

En Mon, 29 Aug 2011 07:40:06 -0300, Sathish S <sathish at solitontech.com>  
escribi?:

> We created a DLL using cygwin and have written a class based python  
> module
> for the same. We have created a sample script for the class based python
> module, that creates an object of the class and calls various methods in  
> the
> class. This Test script works fine while I run it from IDLE. However  
> when I
> run it from command prompt it either hangs or just returns without  
> executing
> the functions. When it returns I do not get a error trace.
>
> When I tried to findout where exactly the issue is happening. the issue
> occurs when I try to call the *cygwin_dll_init* method of the  
> cygwin1.dll .
> This cygwin1.dll is actualy a dependency to the DLL we have built. So we
> have to load this DLL and call this *cygwin_dll_init* method before  
> loading
> my DLL.
>
>
> cyg = cdll.LoadLibrary("cygwin1.dll")
> cyg.cygwin_dll_init() #hangs or returns here
> mydll=cdll.LoadLibrary("my.dll")
>mydll.func1()
>I'm trying to understand what exactly is the difference, when we call it
> IDLE and when we call it from command prompt using the python command. I
> will have to get the script working from command prompt as well.

A few comments:

* why do you initialize cygwin1.dll in Python? If it's a dependency of  
my.dll, it might be better to load and initialize it there.

* for this function prototype: void cygwin_dll_init(void);
you should declare it using:

cyg = cdll.LoadLibrary("cygwin1.dll")
cyg.restype = None
cyg.cygwin_dll_init() #hangs or returns here
...

Anyway, I don't see why a console application would fail but not inside  
IDLE.

-- 
Gabriel Genellina



From askutt at gmail.com  Thu Sep  1 22:28:58 2011
From: askutt at gmail.com (Adam Skutt)
Date: Thu, 1 Sep 2011 19:28:58 -0700 (PDT)
Subject: Python thread
References: <CA85B43F.874C%mydevgroup@gmail.com>
	<mailman.667.1314914411.27778.python-list@python.org>
Message-ID: <ab42ae84-f1a1-47a6-a131-77b0812646b0@k29g2000yqf.googlegroups.com>

On Sep 1, 5:54?pm, Terry Reedy <tjre... at udel.edu> wrote:
> > Does it mean that python threads are not mapped to the core in the system.
>
> They all run on the same core.
>

No, CPython is a native thread implementation, so they'll be scheduled
however the kernel sees fit.  Only allowing one thread to run at a
time doesn't mean they'll always run on the same core.

Adam


From dan at tombstonezero.net  Thu Sep  1 22:32:17 2011
From: dan at tombstonezero.net (Dan Sommers)
Date: Fri, 2 Sep 2011 02:32:17 +0000 (UTC)
Subject: idiomatic analogue of Perl's: while (<>) { ... }
References: <mailman.644.1314853527.27778.python-list@python.org>
	<4e5f2010$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.02.02.32.15@tombstonezero.net>

On Thu, 01 Sep 2011 16:02:54 +1000, Steven D'Aprano wrote:

> On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:

>> # process input, line-by-line, and print responses after parsing input
>> while 1:
>>   rval = parse(raw_input())
>>   if rval == None:
>>     print('foo')
>>   else:
>>     print('bar')
>> %%

> "while True" is considered slightly more idiomatic (readable), but
> otherwise, that seems fine.

Arguably more readable, but arguably less idomatic, is to describe the
actual condition that controls the loop in a string (non-empty strings
are equivalent to True in this context):

while "there is more input":
    rval = parse(raw_input())
    if real is None:
        print('foo')
    else:
        print('bar')

(Although now that I've said that, this looks like an infinite loop
unless parse, raw_input, or print raises an exception.)

Dan



From miki.tebeka at gmail.com  Fri Sep  2 00:01:56 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 1 Sep 2011 21:01:56 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <0d3e6227-9435-4103-b810-ae3b6e58c04f@glegroupsg2000goo.googlegroups.com>

I found http://tobi.oetiker.ch/lshort/lshort.pdf very useful.


From miki.tebeka at gmail.com  Fri Sep  2 00:01:56 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 1 Sep 2011 21:01:56 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <0d3e6227-9435-4103-b810-ae3b6e58c04f@glegroupsg2000goo.googlegroups.com>

I found http://tobi.oetiker.ch/lshort/lshort.pdf very useful.


From invalid at invalid.invalid  Fri Sep  2 00:32:48 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Fri, 2 Sep 2011 04:32:48 +0000 (UTC)
Subject: Threads in Python
References: <CA+kOh44brn-ZnaQEeaXrscrnTwY-A7rAuCTsvwX4egKxa8U60Q@mail.gmail.com>
	<mailman.670.1314916069.27778.python-list@python.org>
Message-ID: <j3pm9g$t6g$1@reader1.panix.com>

On 2011-09-01, Stephen Hansen <me+list/python at ixokai.io> wrote:
> On 9/1/11 2:45 PM, George Kovoor wrote:

>> Why doesn't python threads show an associated PID?  On spawning
>> python threads using the threading module I can only see the main
>> thread's pid on using top or ps unix command, no subprocesses are
>> displayed. In otherwords top or ps in not aware of any subprocesses
>> created using threading module in python.

That's because threads are displayed by top/ps in most Linux systems.

>> Whereas in Java , creating threads will result in separate pid, these
>> subprocesses can be listed using top or ps. Java threads get mapped to the
>> cores in the system.

If that's on the same system, then those aren't threads.

> I think you're confused about what threads and subprocesses are. They
> are completely different mechanisms for concurrent code. Threads never
> show up on top or ps, in any language...

That depends on your threading model.  Some versions of Linux using
LinuxThreads rather than NPTL will show each thread in top or ps.

> or the language isn't offering threads.

The difference between threads and processes isn't whether they show
up in top or ps.  For many years threads showed up in top and ps. They
were still threads.  But, you're right that on most modern,
non-embedded, Linux systems threads don't show up in top or ps.

> I don't know Java, so I can't really comment on it much, but it may
> be misusing the 'thread' word, but I somehow doubt it. I suspect
> you're just mistaken about what Java is offering.

Sure sounds like it.

-- 
Grant


From cs at zip.com.au  Fri Sep  2 01:01:59 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 2 Sep 2011 15:01:59 +1000
Subject: idiomatic analogue of Perl's: while (<>) { ... }
In-Reply-To: <4E60394E.2080708@FreeBSD.org>
References: <4E60394E.2080708@FreeBSD.org>
Message-ID: <20110902050158.GA20589@cskk.homeip.net>

On 01Sep2011 22:02, Sahil Tandon <sahil at FreeBSD.org> wrote:
| [Thanks to everyone who responded]
| 
| Steven D'Aprano wrote:
| >On Thu, 1 Sep 2011 02:56 pm Sahil Tandon wrote:
| >>%%
| >># unbuffer STDOUT
| >>sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
| >
| >I've never bothered with unbuffered stdout, but that looks fine to me.
| >
| >I'm not sure if it is necessary though, because print seems to automatically
| >flush the buffer after each line in my testing. Unless you're printing
| >repeatedly to the same line, I'm not sure unbuffered stdout is helpful.
| 
| I found it necessary because without reopening sys.stdout with
| buffering explicitly turned off, I would have to manually flush the
| buffer after each print.  This is because the program must reply
| (via writing to STDOUT) after parsing each line read via STDIN.  If
| I neither disable buffering nor manually flush after each print, the
| program just hangs instead of printing right away.

Yes. Steven was probably testing on a terminal. UNIX stdio buffering is
line buffered on a terminal and block buffered otherwise (except for
stderr, which is normally unbuffered regardless). So Steven saw stuff
flushed on newlines and you would see stuff flushed when you explicitly
flush or when the buffer fills (probably doesn't happen for your use
because you need a response, and never write enough to fill the buffer).

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Gentle suggestions being those which are written on rocks of less than 5lbs.
        - Tracy Nelson in comp.lang.c


From anacrolix at gmail.com  Fri Sep  2 01:33:01 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Fri, 2 Sep 2011 15:33:01 +1000
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
Message-ID: <CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>

I guess the issue here is that you can't tell if an expression is
complete without checking the indent of the following line. This is
likely not desirable.

On Thu, Sep 1, 2011 at 11:43 PM, Yingjie Lan <lanyjie at yahoo.com> wrote:
> Hi Matt,
> =======================================================
> From: Matt Joiner <anacrolix at gmail.com>
>
> The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
> already heavily used by other syntactical structures.
> =======================================================
> How about only require indentation
> to freely break lines? Here is an example:
> x = firstpart * secondpart #line breaks here
> + anotherpart #continue by indentation
> + stillanother #continue on.
> #until here, another line starts by dedentation
> y = some_expression?- another_one
> All this would be completely compatible with former code, while
> having almost free line breaking! Plus, indentation makes it pretty.
> Really hope Python can have freedom in breaking lines.
> Yingjie


From pavlovevidence at gmail.com  Fri Sep  2 01:42:08 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 1 Sep 2011 22:42:08 -0700 (PDT)
Subject: Optparse buggy?
In-Reply-To: <roy-CFA28A.22161301092011@news.panix.com>
References: <j3osg8$fq8$1@speranza.aioe.org>
	<mailman.666.1314913951.27778.python-list@python.org>
	<roy-CFA28A.22161301092011@news.panix.com>
Message-ID: <058eeca4-6892-4075-abab-3ddcf6773692@glegroupsg2000goo.googlegroups.com>

On Thursday, September 1, 2011 7:16:13 PM UTC-7, Roy Smith wrote:
> In article <mailman.666.13149139... at python.org>,
>  Terry Reedy <tjr... at udel.edu> wrote:
> 
> > Do note "The optparse module is deprecated and will not be developed 
> > further; development will continue with the argparse module."
> 
> One of the unfortunate things about optparse and argparse is the names.  
> I can never remember which is the new one and which is the old one.  It 
> would have been a lot simpler if the new one had been named optparse2 
> (in the style of unittest2 and urllib2).

It's easy: "opt"parse parses only "opt"ions (-d and the like), whereas "arg"parse parses all "arg"uments.  argparse is the more recent version since it does more.  optparse2 would have been a bad name for something that parses more than options.

(In fact, although I have some minor philosophical disagreements with optparse's design decisions, the main reason I always recommended using argparse instead was that optparse didn't handle positional arguments.  optparse has all these spiffy features with type checking and defaults, but it never occurred to the optparse developers that this stuff would be useful for positional arugments, too.  They just dropped the ball there.)


Carl Banks


From gahtune at gmail.com  Fri Sep  2 02:14:12 2011
From: gahtune at gmail.com (Gabriel AHTUNE)
Date: Fri, 2 Sep 2011 14:14:12 +0800
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
Message-ID: <CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>

So can be done with this syntax:

> x = firstpart * secondpart  +  #line breaks here
> anotherpart + #continue
> stillanother #continue on.

after a "+" operator the line is clearly not finished yet.

Gabriel AHTUNE


2011/9/2 Matt Joiner <anacrolix at gmail.com>

> I guess the issue here is that you can't tell if an expression is
> complete without checking the indent of the following line. This is
> likely not desirable.
>
> On Thu, Sep 1, 2011 at 11:43 PM, Yingjie Lan <lanyjie at yahoo.com> wrote:
> > Hi Matt,
> > =======================================================
> > From: Matt Joiner <anacrolix at gmail.com>
> >
> > The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
> > already heavily used by other syntactical structures.
> > =======================================================
> > How about only require indentation
> > to freely break lines? Here is an example:
> > x = firstpart * secondpart #line breaks here
> > + anotherpart #continue by indentation
> > + stillanother #continue on.
> > #until here, another line starts by dedentation
> > y = some_expression - another_one
> > All this would be completely compatible with former code, while
> > having almost free line breaking! Plus, indentation makes it pretty.
> > Really hope Python can have freedom in breaking lines.
> > Yingjie
> _______________________________________________
> Python-ideas mailing list
> Python-ideas at python.org
> http://mail.python.org/mailman/listinfo/python-ideas
>
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From sathish at solitontech.com  Fri Sep  2 02:17:18 2011
From: sathish at solitontech.com (Sathish S)
Date: Fri, 2 Sep 2011 11:47:18 +0530
Subject: Calling Script from Command line not working
In-Reply-To: <op.v05s24u3x6zn5v@lepton>
References: <CADBb1sdSMyiEKSaxPgScE_sCobpcVkFjuEJP0iFJ_KJJPFnQGg@mail.gmail.com>
	<op.v05s24u3x6zn5v@lepton>
Message-ID: <CADBb1seMVO70EeOE83+bR2YnCj8ToWz-oe_=2oSL_kHemB6xBA@mail.gmail.com>

Hey Gabriel,
Thanks a lot for replying. I was able to run this python script from
console/command prompt using cygwin python. I'm not sure whats the
difference between these two versions of python. But it seems to be working.
Searching theough the web i found that having cygwin1.dll could be causing
this issue. So I'm trying to build my DLL using MinGW which will not create
an dependecy DLL's. But I'm stuck up with few more issue in porting few
functions to MinGW.

I'm using Python2.7 and Cygwin Python 2.6.5

*Reply to your comments:*

** why do you initialize cygwin1.dll in Python? If it's a dependency of
my.dll, it might be better to load and initialize it there.*
Yes, cygwin1.dll is actually a dependency to my.dll. hence I'm loading it
and initializing it
** for this function prototype: void cygwin_dll_init(void);*
*you should declare it using:*
I'm doing this as you said. But didn't mention it in my mail

hCyg = cdll.LoadLibrary(CygWinDLL_Name)
hCyg = CDLL(CygWinDLL_Name)
Prototype_Cyg = CFUNCTYPE(c_void_p)
Init = Prototype_Cyg (("cygwin_dll_init", hCyg))
Init.restype = c_void_p
Init()

Thanks,
Sathish


On Fri, Sep 2, 2011 at 7:56 AM, Gabriel Genellina <gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 29 Aug 2011 07:40:06 -0300, Sathish S <sathish at solitontech.com>
> escribi?:
>
>
>  We created a DLL using cygwin and have written a class based python module
>> for the same. We have created a sample script for the class based python
>> module, that creates an object of the class and calls various methods in
>> the
>> class. This Test script works fine while I run it from IDLE. However when
>> I
>> run it from command prompt it either hangs or just returns without
>> executing
>> the functions. When it returns I do not get a error trace.
>>
>> When I tried to findout where exactly the issue is happening. the issue
>> occurs when I try to call the *cygwin_dll_init* method of the cygwin1.dll
>> .
>> This cygwin1.dll is actualy a dependency to the DLL we have built. So we
>> have to load this DLL and call this *cygwin_dll_init* method before
>> loading
>> my DLL.
>>
>>
>> cyg = cdll.LoadLibrary("cygwin1.dll"**)
>> cyg.cygwin_dll_init() #hangs or returns here
>> mydll=cdll.LoadLibrary("my.**dll")
>> mydll.func1()
>> I'm trying to understand what exactly is the difference, when we call it
>> IDLE and when we call it from command prompt using the python command. I
>> will have to get the script working from command prompt as well.
>>
>
> A few comments:
>
> * why do you initialize cygwin1.dll in Python? If it's a dependency of
> my.dll, it might be better to load and initialize it there.
>
> * for this function prototype: void cygwin_dll_init(void);
> you should declare it using:
>
>
> cyg = cdll.LoadLibrary("cygwin1.dll"**)
> cyg.restype = None
>
> cyg.cygwin_dll_init() #hangs or returns here
> ...
>
> Anyway, I don't see why a console application would fail but not inside
> IDLE.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
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From greg.ewing at canterbury.ac.nz  Fri Sep  2 02:19:58 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 02 Sep 2011 18:19:58 +1200
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <pan.2011.09.02.00.10.14.153000@nowhere.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<pan.2011.09.02.00.10.14.153000@nowhere.com>
Message-ID: <9cbashF8buU1@mid.individual.net>

> On Thu, 01 Sep 2011 08:52:49 -0700, Den wrote:
> 
>>Also, is there a corresponding key-sequence in Mac and Linux?

The nearest equivalent in MacOSX is Command-Option-Escape, which
brings up the force-quit dialog. I don't know how deep down in
the system it's implemented.

It's possible to use SetSystemUIMode to put an app into a "kiosk
mode" where force-quitting is disabled, but I don't know whether
the app can intercept Command-Option-Escape in that situation and
do something else with it.

-- 
Greg


From sathish at solitontech.com  Fri Sep  2 02:21:52 2011
From: sathish at solitontech.com (Sathish S)
Date: Fri, 2 Sep 2011 11:51:52 +0530
Subject: Calling Script from Command line not working
In-Reply-To: <CADBb1seMVO70EeOE83+bR2YnCj8ToWz-oe_=2oSL_kHemB6xBA@mail.gmail.com>
References: <CADBb1sdSMyiEKSaxPgScE_sCobpcVkFjuEJP0iFJ_KJJPFnQGg@mail.gmail.com>
	<op.v05s24u3x6zn5v@lepton>
	<CADBb1seMVO70EeOE83+bR2YnCj8ToWz-oe_=2oSL_kHemB6xBA@mail.gmail.com>
Message-ID: <CADBb1sefJfBODS32C2_8X6T9WvZ4j5i5PiLsfWSaE3jHaniu5Q@mail.gmail.com>

One more thing I observed is, while running the script from IDLE it launches
a seperate process of pythonw.exe and I could see this console window poping
up. However while running it from command prompt this does not happens. I
was wondering if the command prompt way of calling the script is not able to
launch this new process, that why it could be hanging.

BTW I'm still trying to get the script running using Python 2.7 from the
command prompt.

Thanks,
Sathish


On Fri, Sep 2, 2011 at 11:47 AM, Sathish S <sathish at solitontech.com> wrote:

> Hey Gabriel,
> Thanks a lot for replying. I was able to run this python script from
> console/command prompt using cygwin python. I'm not sure whats the
> difference between these two versions of python. But it seems to be working.
> Searching theough the web i found that having cygwin1.dll could be causing
> this issue. So I'm trying to build my DLL using MinGW which will not create
> an dependecy DLL's. But I'm stuck up with few more issue in porting few
> functions to MinGW.
>
> I'm using Python2.7 and Cygwin Python 2.6.5
>
> *Reply to your comments:*
>
>
> ** why do you initialize cygwin1.dll in Python? If it's a dependency of
> my.dll, it might be better to load and initialize it there.*
> Yes, cygwin1.dll is actually a dependency to my.dll. hence I'm loading it
> and initializing it
>
> ** for this function prototype: void cygwin_dll_init(void);*
> *you should declare it using:*
> I'm doing this as you said. But didn't mention it in my mail
>
> hCyg = cdll.LoadLibrary(CygWinDLL_Name)
> hCyg = CDLL(CygWinDLL_Name)
> Prototype_Cyg = CFUNCTYPE(c_void_p)
> Init = Prototype_Cyg (("cygwin_dll_init", hCyg))
> Init.restype = c_void_p
> Init()
>
> Thanks,
> Sathish
>
>
>
> On Fri, Sep 2, 2011 at 7:56 AM, Gabriel Genellina <gagsl-py2 at yahoo.com.ar>wrote:
>
>> En Mon, 29 Aug 2011 07:40:06 -0300, Sathish S <sathish at solitontech.com>
>> escribi?:
>>
>>
>>  We created a DLL using cygwin and have written a class based python
>>> module
>>> for the same. We have created a sample script for the class based python
>>> module, that creates an object of the class and calls various methods in
>>> the
>>> class. This Test script works fine while I run it from IDLE. However when
>>> I
>>> run it from command prompt it either hangs or just returns without
>>> executing
>>> the functions. When it returns I do not get a error trace.
>>>
>>> When I tried to findout where exactly the issue is happening. the issue
>>> occurs when I try to call the *cygwin_dll_init* method of the cygwin1.dll
>>> .
>>> This cygwin1.dll is actualy a dependency to the DLL we have built. So we
>>> have to load this DLL and call this *cygwin_dll_init* method before
>>> loading
>>> my DLL.
>>>
>>>
>>> cyg = cdll.LoadLibrary("cygwin1.dll"**)
>>> cyg.cygwin_dll_init() #hangs or returns here
>>> mydll=cdll.LoadLibrary("my.**dll")
>>> mydll.func1()
>>> I'm trying to understand what exactly is the difference, when we call it
>>> IDLE and when we call it from command prompt using the python command. I
>>> will have to get the script working from command prompt as well.
>>>
>>
>> A few comments:
>>
>> * why do you initialize cygwin1.dll in Python? If it's a dependency of
>> my.dll, it might be better to load and initialize it there.
>>
>> * for this function prototype: void cygwin_dll_init(void);
>> you should declare it using:
>>
>>
>> cyg = cdll.LoadLibrary("cygwin1.dll"**)
>> cyg.restype = None
>>
>> cyg.cygwin_dll_init() #hangs or returns here
>> ...
>>
>> Anyway, I don't see why a console application would fail but not inside
>> IDLE.
>>
>> --
>> Gabriel Genellina
>>
>> --
>> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>>
>
>
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From lanyjie at yahoo.com  Fri Sep  2 02:38:01 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Thu, 1 Sep 2011 23:38:01 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
Message-ID: <1314945481.74495.YahooMailNeo@web121517.mail.ne1.yahoo.com>



Hi Gabriel,

==================================================
From: Gabriel AHTUNE <gahtune at gmail.com>
Subject: Re: [Python-ideas] allow line break at operators


So can be done with this syntax:

> x = firstpart * secondpart? +? #line breaks here
> anotherpart + #continue 
> stillanother #continue on.

after a "+" operator the line is clearly not finished yet.

Gabriel AHTUNE

==================================================

That's good to me too, which I proposed early in this thread.
Then somebody would like to have the operator in the
beginning of the next line so that it would stand out.Then still another one said that indentation is good here.
So I finally proposed line continuation with indentation.
Since this is Python, we will live with indentation.
Currently indentation in Python starts a new block,
but if you view it from the perspective of line breaking,
it also function as if the line is continued. The line

if condition: do_a(); do_b()

can be ?written as:

if condition: #line breaks
do_a(); # ';' is optional here?
do_b() # continue

Sounds a pretty natural way to allow free line breaking.


Yingjie
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From lanyjie at yahoo.com  Fri Sep  2 02:45:07 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Thu, 1 Sep 2011 23:45:07 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
Message-ID: <1314945907.94847.YahooMailNeo@web121513.mail.ne1.yahoo.com>

Yeah, that might be a challenge for the Python?interpreter, for it has to check if the next line is indented or not. But it might be worthwhile to take this trouble, so that the coder has more freedom, and the code is hopefully better to read.


________________________________
From: Matt Joiner <anacrolix at gmail.com>
To: Yingjie Lan <lanyjie at yahoo.com>
Cc: "python-list at python.org" <python-list at python.org>; python-ideas <python-ideas at python.org>
Sent: Friday, September 2, 2011 1:33 PM
Subject: Re: [Python-ideas] allow line break at operators

I guess the issue here is that you can't tell if an expression is
complete without checking the indent of the following line. This is
likely not desirable.

On Thu, Sep 1, 2011 at 11:43 PM, Yingjie Lan <lanyjie at yahoo.com> wrote:
> Hi Matt,
> =======================================================
> From: Matt Joiner <anacrolix at gmail.com>
>
> The "trailing \" workaround is nonobvious. Wrapping in () is noisy and
> already heavily used by other syntactical structures.
> =======================================================
> How about only require indentation
> to freely break lines? Here is an example:
> x = firstpart * secondpart #line breaks here
> + anotherpart #continue by indentation
> + stillanother #continue on.
> #until here, another line starts by dedentation
> y = some_expression?- another_one
> All this would be completely compatible with former code, while
> having almost free line breaking! Plus, indentation makes it pretty.
> Really hope Python can have freedom in breaking lines.
> Yingjie
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From me+list/python at ixokai.io  Fri Sep  2 03:06:12 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Fri, 02 Sep 2011 00:06:12 -0700
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <4E608064.9030005@ixokai.io>

On 9/1/11 8:52 AM, Den wrote:
> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?

IIUC, by definition, Ctrl-Alt-Delete can't be responded to in any way.
Its the entire point of the sequence: when you type it you can be
entirely, totally, 100% certain that what happens next is the true OS
and not any app faking things.

That's why you have to hit CAD to get to the login form in some versions
of Windows. The whole point of that secure sequence is that the OS and
only the OS responds.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

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From tavares at fe.up.pt  Fri Sep  2 03:08:14 2011
From: tavares at fe.up.pt (tavares at fe.up.pt)
Date: Fri, 2 Sep 2011 00:08:14 -0700 (PDT)
Subject: CompIMAGE 2012: Call for Thematic Sessions and Papers
Message-ID: <ddaa0b56-c3a8-4576-9e70-a75c9a9f20ba@h11g2000vbc.googlegroups.com>

Dear Colleague,

We would like to call your attention to the International Symposium
CompIMAGE 2012 ? Computational Modeling of Objects Presented in
Images: Fundamentals, Methods and Applications (www.dis.uniroma1.it/
compimage2012), that will be held in Rome, Italy, in September 5-7,
2012.

MAIN TOPICS

- image processing and analysis
- image segmentation
- 2D and 3D reconstruction
- data interpolation
- registration and acquisition
- objects tracking
- scientific data visualization
- satellite data
- shape modeling
- simulation
- biometric person identification
- medical imaging
- motion and deformation analysis
- material science
- large set data visualization
- vision in robotics and automation

INVITED LECTURERS

- Lorenzo Bruzzone, University of Trento, Italy
- Jorge Marques, Instituto Superior T?cnico, Lisboa, Portugal
- Fiorella Sgallari, University of Bologna, Italy
- Bertrand Thirion, INRIA, France
- Luminita Vese, UCLA, USA

THEMATIC SESSIONS

Proposals to organize Thematic Session within CompIMAGE2012 are
welcome and should be submitted by email to:
compimage2012 at dis.uniroma1.it.

PUBLICATIONS

- The proceedings book will be published by Taylor & Francis Group and
indexed by Thomson Reuters Conference Proceedings Citation Index, IET
Inspect and Elsevier Scopus.

- A book with 20 invited works from the best ones presented in
CompIMAGE 2012 (extended versions) will be published by Springer.

- The organizers will encourage the submission of extended versions of
the accepted papers to related International Journals; in particular,
for special issues dedicated to CompIMAGE 2012.

IMPORTANT DATES

- Deadline for Thematic Sessions proposals: November 1, 2011
- Deadline for Full Paper Submission: December 31, 2011
- Authors Notification: March 16, 2012
- Final camera-ready papers: April 20, 2012
- Early Symposium registration (mandatory for Authors): April 20, 2012
- Symposium dates: September 5-7, 2012

AWARDS

"Best paper award" and "Best student paper award" are going to be
given to the author(s) of two papers presented at CompIMAGE 2012,
selected by the Organizing Committee based on the best combined marks
from the Scientific Committee and Session Chairs.

Kind regards,

Paolo Di Giamberardino
Daniela Iacoviello
Renato M. Natal Jorge
Jo?o Manuel R. S. Tavares

PS. For further details, please, visit CompIMAGE 2012 website at:
www.dis.uniroma1.it/compimage2012.


From nemjain at gmail.com  Fri Sep  2 03:12:18 2011
From: nemjain at gmail.com (nemi)
Date: Fri, 2 Sep 2011 00:12:18 -0700 (PDT)
Subject: How to daemonize a HTTPServer
References: <594e0376-3a1d-4430-bf47-d1e0f856c4dd@f31g2000prj.googlegroups.com>
	<j3nmvr$98t$1@dont-email.me>
Message-ID: <d8e93c2a-eb02-467d-9473-1f623f474067@t30g2000prm.googlegroups.com>

On Sep 1, 6:32?am, "Martin P. Hellwig" <martin.hell... at gmail.com>
wrote:
> On 01/09/2011 04:16, babbu Pehlwan wrote:
>
> > I have written a http server using BaseHTTPServer module. Now I want
> > to instantiate it through another python script. The issue here is
> > after instantiate the control doesn't come back till the server is
> > running. Please suggest.
>
> Sounds like something you could use the multiprocessing module for, but
> then again my crystal ball is a bit fuzzy today.
>
> --
> mph

Thanks dear, the issue get solved now. You are absolutely right,
actually I was daemonising the same thread. Now I have created a
seperate thread for the server.


From stephen at xemacs.org  Fri Sep  2 03:28:16 2011
From: stephen at xemacs.org (Stephen J. Turnbull)
Date: Fri, 02 Sep 2011 16:28:16 +0900
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
Message-ID: <877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>

Gabriel AHTUNE writes:
 > So can be done with this syntax:
 > 
 > > x = firstpart * secondpart  +  #line breaks here
 > > anotherpart + #continue
 > > stillanother #continue on.
 > 
 > after a "+" operator the line is clearly not finished yet.

Sure, but IIRC one design principle of Python is that the keyword that
denotes the syntax should be the first thing on the line, making it
easy to scan down the left side of the code to see the syntactic
structure.  The required indentation of the controlled suite also
helps emphasize that keyword.

Analogously, if operators are going to denote continuation, they
should come first on the line.

I just don't think this idea is going anywhere.  Explicit continuation
with backslash or implicit continuation of parenthesized expressions
is just not that heavy a price to pay.  Perhaps historically some of
these ideas could have been implemented, but now they're just going to
confuse a host of editors and code analysis tools.


From rosuav at gmail.com  Fri Sep  2 03:55:41 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 2 Sep 2011 17:55:41 +1000
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <4E608064.9030005@ixokai.io>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<4E608064.9030005@ixokai.io>
Message-ID: <CAPTjJmqb7ferhp8dg5pZqS-U1vdHJkBohzFE_2rR30=9wEYQeA@mail.gmail.com>

On Fri, Sep 2, 2011 at 5:06 PM, Stephen Hansen <me+list/python at ixokai.io> wrote:
> That's why you have to hit CAD to get to the login form in some versions
> of Windows. The whole point of that secure sequence is that the OS and
> only the OS responds.
>

Although I heard somewhere that that's more gimmick than guarantee,
and that it IS possible for an app to hook CAD - just that it's a lot
harder than building a simple window that looks like the login... but
it's pretty easy to fool a lot of people. Just look at the emails in
your spam box one day, find the ones spoofing a bank, and see what a
poor job they do. And yet they work.

ChrisA


From vinay_sajip at yahoo.co.uk  Fri Sep  2 05:56:29 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 02:56:29 -0700 (PDT)
Subject: Help me understand this logging config
References: <bdf729a3-5f68-46fb-b6ae-27dceed5af77@18g2000yqu.googlegroups.com>
	<mailman.566.1314696279.27778.python-list@python.org>
	<roy-7F52BC.08392630082011@news.panix.com>
Message-ID: <fa2db494-bd1b-40f1-bfcf-5be31c8f97a6@a31g2000vbt.googlegroups.com>

On Aug 30, 1:39 pm, Roy Smith <r... at panix.com> wrote:
> Oh, my, it turns out that django includes:
>
> # This is a copy of the Pythonlogging.config.dictconfig module,
> # reproduced with permission. It is provided here for backwards
> # compatibility for Python versions prior to 2.7.
>
> Comparing the django copy to lib/logging/config.py from Python 2.7.2,
> they're not identical.  It's likely they grabbed something earlier in
> the 2.7 series.  I'll check 2.7.0 and 2.7.1 to see.

They're not identical, but should be functionally equivalent. I'm not
able to reproduce your results: I copied the "loggers" part of your
config into a Django 1.3 project, and from a manage.py shell session:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import logging
>>> logger = logging.getLogger('djfront.auth.facebook')
>>> logger.debug('Debug')
>>> logger.info('Info')
2011-09-02 10:51:13,445 INFO     djfront.auth.facebook Info
>>>

... as expected.

Since it's Python 2.6, it should be using the dictconfig which ships
with Django 1.3.

Regards,

Vinay Sajip


From vinay_sajip at yahoo.co.uk  Fri Sep  2 05:58:29 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 09:58:29 +0000 (UTC)
Subject: Help me understand this logging config
References: <bdf729a3-5f68-46fb-b6ae-27dceed5af77@18g2000yqu.googlegroups.com>
	<mailman.566.1314696279.27778.python-list@python.org>
	<roy-7F52BC.08392630082011@news.panix.com>
Message-ID: <loom.20110902T115801-476@post.gmane.org>

On Aug 30, 1:39 pm, Roy Smith <r... at panix.com> wrote:
> Oh, my, it turns out that django includes:
> 
> # This is a copy of the Pythonlogging.config.dictconfig module,              
                     
> # reproduced with permission. It is provided here for backwards              
                     
> # compatibility for Python versions prior to 2.7.
> 
> Comparing the django copy to lib/logging/config.py from Python 2.7.2,
> they're not identical.  It's likely they grabbed something earlier in
> the 2.7 series.  I'll check 2.7.0 and 2.7.1 to see.

They're not identical, but should be functionally equivalent. I'm not able to
reproduce your results: I copied the "loggers" part of your config into a Django
1.3 project, and from a manage.py shell session:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import logging
>>> logger = logging.getLogger('djfront.auth.facebook')
>>> logger.debug('Debug')
>>> logger.info('Info')
2011-09-02 10:51:13,445 INFO     djfront.auth.facebook Info
>>> 

... as expected.

Since it's Python 2.6, it should be using the dictconfig which ships with Django
1.3.

Regards,

Vinay Sajip



From vinay_sajip at yahoo.co.uk  Fri Sep  2 06:00:30 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 03:00:30 -0700 (PDT)
Subject: Help me understand this logging config
References: <bdf729a3-5f68-46fb-b6ae-27dceed5af77@18g2000yqu.googlegroups.com>
	<mailman.566.1314696279.27778.python-list@python.org>
	<roy-7F52BC.08392630082011@news.panix.com>
Message-ID: <d4a6dc37-0165-4209-ac79-2fbdc507dcdc@er4g2000vbb.googlegroups.com>

On Aug 30, 1:39 pm, Roy Smith <r... at panix.com> wrote:
> Oh, my, it turns out that django includes:
>
> # This is a copy of the Pythonlogging.config.dictconfig module,
> # reproduced with permission. It is provided here for backwards
> # compatibility for Python versions prior to 2.7.
>
> Comparing the django copy to lib/logging/config.py from Python 2.7.2,
> they're not identical.  It's likely they grabbed something earlier in
> the 2.7 series.  I'll check 2.7.0 and 2.7.1 to see.

They're not identical, but should be functionally equivalent. I'm not
able to reproduce your results: I copied the "loggers" part of your
config into a Django 1.3 project, and from a manage.py shell session:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import logging
>>> logger = logging.getLogger('djfront.auth.facebook')
>>> logger.debug('Debug')
>>> logger.info('Info')
2011-09-02 10:51:13,445 INFO     djfront.auth.facebook Info
>>>

... as expected.

Since it's Python 2.6, it should be using the dictconfig which ships
with Django 1.3.

Regards,

Vinay Sajip


From t at jollybox.de  Fri Sep  2 06:01:34 2011
From: t at jollybox.de (Thomas Jollans)
Date: Fri, 02 Sep 2011 12:01:34 +0200
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <4E60A97E.2080506@jollybox.de>

On 01/09/11 17:52, Den wrote:
> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?
> 
> Also, is there a corresponding key-sequence in Mac and Linux?  And how
> might one detect those too?

On Linux Ctrl+Alt+Delete is typically configured to reboot the machine
when in console mode. In X11 (graphical), as far as I know, it's no
different than other keys. To catch it globally, you'd probably have to
go through the individual window manager.

As m'colleague Nobody mentions, there's also the SysRq feature, but that
always goes straight to the kernel and is, like Ctrl+Alt+Delete on
Windows, impossible to handle in userspace code.

Thomas


From fnautaNO at SPAMsolfon.nl  Fri Sep  2 08:04:55 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 14:04:55 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><6545843.yvFAXZvWTv@PointedEars.de><9c528rFi5aU1@mid.individual.net><4761603.ypaU67uLZW@PointedEars.de><9c6d4cFa54U1@mid.individual.net>
	<mailman.622.1314812583.27778.python-list@python.org>
Message-ID: <9cbvupFjr3U2@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.622.1314812583.27778.python-list at python.org...
> On Wed, 31 Aug 2011 11:27:36 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>>
>> Ofcourse I realized it was Unix/Linux. I already could tell that as the
>> packages I downloaded were tar.gz files.
>> So I unpacked them and expected to run a Python installer script from the
>> Python command line.
>> Hence my question "How do I do that", but perhaps I did not make myself
>> clear enough.
>>
> NO Python package installer runs "from the Python command line" (ie;
> from a Python interactive session prompt).
>
> Typically you run them from the OS command interpreter. If the
> installer is a .py file and the associations are correct, the Python
> interpreter will be started to process the installer script. If the
> associations aren't set, you may have to enter
>
> python installer.py
>
> at the system prompt instead of
>
> installer.py
>
>> Tried to run the Python installer script from the DOS command line but 
>> that
>> resulted in an error.
>>
> Okay -- so what was the error?
> -- 

Sorry - I didn't come back on your question. In the mean time I forgot what 
the error message was.
But I installed it the way Paul K?lle mentioned:

"You dont install from "Python GUI", use normal cmd, navigate to the
folder you downloaded PyXML and PyWebDAV and run "python setup.py
install" (python.exe has to be in your PATH)."

Fokke




From fnautaNO at SPAMsolfon.nl  Fri Sep  2 08:19:32 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 14:19:32 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
Message-ID: <9cbvupFjr3U3@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.687.1314941410.27778.python-list at python.org...
> On Thu, 1 Sep 2011 12:30:43 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>> "Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message
>> news:mailman.643.1314851358.27778.python-list at python.org...
>
>> > Next, if you'd read further and didn't take the comment as the
>> > instruction. set
>> > firstrun=1
>>
>> I did
>>
>> > to tell the server this is the first time it is being run - IT WILL
>> > create the database table (after the first start, reset the flag to 0 
>> > to
>> > speed up later runs).
>>
>> It didn't create the table. The database kept empty.
>
> Odd -- but then, I'm not running it myself, and wasn't up to reading
> all the code to see what path it takes.

It's only for experimenting with calendar software, so authorization is not 
a point.
So I forget about MySQL.

>>
>> > Later in the config file set
>> > mysql_auth=1
>> > to enable the use of MySQL, and set the admin user/password to what you
>> > plan to have it use.
>>
>> I did
>>
>> > You probably want to set
>> > daemonize=1
>> > (maybe after first run)
>>
>> I left this to 0.
>>
>> > Oh, and don't forget to set the main data directory and any
>> > port/host changes.
>>
>> I left host and port as they were. The main directory is e:\wwwroot
>>
>> > Start the server - it should connect to MySQL, create the table, and
>> > add the admin user to the table.
>>
>> I started the server with server.py (in
>> D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini
>>
> If the main directory is already in the config file, you probably
> don't need to specify it on the command line...

OK

> And... could there be
> something in the code where overriding the directory by command line
> changes where it looks for the config file? (Just guessing at this
> point).
>

Possibly.
I tried this:
server.py -n -c config.ini
Once again, the server is up and running and when I am logging in with my 
browser (10.0.0.140:8081) I can see information showing up at the command 
prompt, showing somebody is logging is, but the same error: 
"fshandler:get_data: \Webdav not found". During starting up the server 
mentioned: "pywebdav:Serving data from \Webdav".

In the config file it says:
"# main directory
directory = \Webdav"

Perhaps my Python configuration is at fault.

Fokke 




From msamogh at gmail.com  Fri Sep  2 08:25:28 2011
From: msamogh at gmail.com (Amogh M S)
Date: Fri, 2 Sep 2011 17:55:28 +0530
Subject: Python-list Digest, Vol 96, Issue 4
In-Reply-To: <mailman.66.1314871203.20590.python-list@python.org>
References: <mailman.66.1314871203.20590.python-list@python.org>
Message-ID: <CABWGKeWzCeuQ6QyjoS7JdpP0ho3-6QZXxHm=BAohUnxPQzXnSw@mail.gmail.com>

Thank you very much
And no, no, I have not been reading a book with bad font =D haha!!
The problem was that I did not inherit from Object... Since I am from a JAVA
background, I assumed that Python would inherit implicitly.
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From sjmsoft at gmail.com  Fri Sep  2 08:27:50 2011
From: sjmsoft at gmail.com (sjm)
Date: Fri, 2 Sep 2011 05:27:50 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <c287acc8-8fec-4f3d-ad64-bea090ed8eae@w28g2000yqw.googlegroups.com>

On Sep 1, 12:52?pm, Den <patents... at gmail.com> wrote:
> Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?

If you manage to write a program that can detect CTRL-ALT-DEL, please
report it as a bug in Windows!  CTRL-ALT-DEL is Windows' "secure
attention sequence" which must only be handled by the OS.

-- Steve



From msamogh at gmail.com  Fri Sep  2 08:29:17 2011
From: msamogh at gmail.com (Amogh M S)
Date: Fri, 2 Sep 2011 17:59:17 +0530
Subject: Python-list Digest, Vol 96, Issue 4
In-Reply-To: <CABWGKeWzCeuQ6QyjoS7JdpP0ho3-6QZXxHm=BAohUnxPQzXnSw@mail.gmail.com>
References: <mailman.66.1314871203.20590.python-list@python.org>
	<CABWGKeWzCeuQ6QyjoS7JdpP0ho3-6QZXxHm=BAohUnxPQzXnSw@mail.gmail.com>
Message-ID: <CABWGKeUd+r6XmtTHo-2N2NcD6jxf5BtU4BsOHN=h4csSiDH+BQ@mail.gmail.com>

Two underscores??!!! OH!!! I thank thee!
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From mail at timgolden.me.uk  Fri Sep  2 08:45:39 2011
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 02 Sep 2011 13:45:39 +0100
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <4e60ce59$0$18107$426a74cc@news.free.fr>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<4e60ce59$0$18107$426a74cc@news.free.fr>
Message-ID: <4E60CFF3.6080006@timgolden.me.uk>

>> Obviously, this is a windows-based question.  I know that Ctrl-Alt-Del
>> is handled deep inside the OS, and I'm not trying to interrupt that.
>> But is there some way to detect that a C-A-D has been pressed?

Others have pointed out that this shouldn't really be possible for
reasons of security. (And I agree). However, if what you're really
after is to detect a session switch or a logon then this might
be of some use:

http://timgolden.me.uk/python/win32_how_do_i/track-session-events.html

TJG


From bex.lewis at gmail.com  Fri Sep  2 09:09:06 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Fri, 2 Sep 2011 06:09:06 -0700 (PDT)
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
Message-ID: <86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>

On Sep 2, 1:19?pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in messagenews:mailman.687.1314941410.27778.python-list at python.org...
>
>
>
>
>
>
>
>
>
> > On Thu, 1 Sep 2011 12:30:43 +0200, "Fokke Nauta"
> > <fnaut... at SPAMsolfon.nl> declaimed the following in
> > gmane.comp.python.general:
>
> >> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in message
> >>news:mailman.643.1314851358.27778.python-list at python.org...
>
> >> > Next, if you'd read further and didn't take the comment as the
> >> > instruction. set
> >> > firstrun=1
>
> >> I did
>
> >> > to tell the server this is the first time it is being run - IT WILL
> >> > create the database table (after the first start, reset the flag to 0
> >> > to
> >> > speed up later runs).
>
> >> It didn't create the table. The database kept empty.
>
> > Odd -- but then, I'm not running it myself, and wasn't up to reading
> > all the code to see what path it takes.
>
> It's only for experimenting with calendar software, so authorization is not
> a point.
> So I forget about MySQL.
>
>
>
>
>
>
>
>
>
>
>
> >> > Later in the config file set
> >> > mysql_auth=1
> >> > to enable the use of MySQL, and set the admin user/password to what you
> >> > plan to have it use.
>
> >> I did
>
> >> > You probably want to set
> >> > daemonize=1
> >> > (maybe after first run)
>
> >> I left this to 0.
>
> >> > Oh, and don't forget to set the main data directory and any
> >> > port/host changes.
>
> >> I left host and port as they were. The main directory is e:\wwwroot
>
> >> > Start the server - it should connect to MySQL, create the table, and
> >> > add the admin user to the table.
>
> >> I started the server with server.py (in
> >> D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini
>
> > If the main directory is already in the config file, you probably
> > don't need to specify it on the command line...
>
> OK
>
> > And... could there be
> > something in the code where overriding the directory by command line
> > changes where it looks for the config file? (Just guessing at this
> > point).
>
> Possibly.
> I tried this:
> server.py -n -c config.ini
> Once again, the server is up and running and when I am logging in with my
> browser (10.0.0.140:8081) I can see information showing up at the command
> prompt, showing somebody is logging is, but the same error:
> "fshandler:get_data: \Webdav not found". During starting up the server
> mentioned: "pywebdav:Serving data from \Webdav".
>
> In the config file it says:
> "# main directory
> directory = \Webdav"
>
> Perhaps my Python configuration is at fault.
>
> Fokke

Is the path supposed to be absolute? In which case you'd need to have:
directory=C:\path\to\Webdav

instead of just
directory=\Webdav


Becky Lewis


From python at bdurham.com  Fri Sep  2 09:11:13 2011
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 02 Sep 2011 09:11:13 -0400
Subject: Installing WebDAV server
In-Reply-To: <9cbvupFjr3U3@mid.individual.net>
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
Message-ID: <1314969073.6889.140258136595213@webmail.messagingengine.com>

Hi Fokke,

Disclaimer: I have no experience with the Python WebDAV package you're
using.

But a thought:

> In the config file it says:
> "# main directory
> directory = \Webdav"

Perhaps you should qualify your directory path with a drive letter?

I would try this 2 ways:

directory = E:\Webdav

And if that doesn't work:

directory = E:/Webdav

My thinking about the 2nd example is that perhaps the \W is getting
interpreted as a control character vs. "backslash" "W".

Malcolm


From alan.isaac at gmail.com  Fri Sep  2 09:12:37 2011
From: alan.isaac at gmail.com (Alan)
Date: Fri, 2 Sep 2011 06:12:37 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>

http://www.pytex.org/

hth,
Alan Isaac


From alan.isaac at gmail.com  Fri Sep  2 09:12:37 2011
From: alan.isaac at gmail.com (Alan)
Date: Fri, 2 Sep 2011 06:12:37 -0700 (PDT)
Subject: slightly OT -- LaTeX
In-Reply-To: <mailman.677.1314927521.27778.python-list@python.org>
References: <mailman.677.1314927521.27778.python-list@python.org>
Message-ID: <5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>

http://www.pytex.org/

hth,
Alan Isaac


From kw at codebykevin.com  Fri Sep  2 09:21:43 2011
From: kw at codebykevin.com (Kevin Walzer)
Date: Fri, 02 Sep 2011 09:21:43 -0400
Subject: OSX application built with py2app can't see bundled PySide module?
In-Reply-To: <2e0b44ea-0d71-4c30-8efe-6582cf6923bd@glegroupsg2000goo.googlegroups.com>
References: <2e0b44ea-0d71-4c30-8efe-6582cf6923bd@glegroupsg2000goo.googlegroups.com>
Message-ID: <j3ql94$dh2$1@dont-email.me>

On 9/1/11 3:54 PM, Aaron Scott wrote:
> I'm trying to deploy a Python app on OSX that was built with PySide. py2app packages it without issue, copying and linking a lot of PySide and Qt files in the process. But then, when I try to run the built app, I get this error:
>
> Traceback (most recent call last):
>    File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 31, in<module>
>      _run('dailies_v02.py')
>    File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/__boot__.py", line 28, in _run
>      execfile(path, globals(), globals())
>    File "/Users/sequence/Desktop/code/dailies/dist/dailies_v02.app/Contents/Resources/dailies_v02.py", line 9, in<module>
> from PySide.QtCore import *
>    File "PySide/__init__.pyc", line 2, in<module>
>    File "PySide/private.pyc", line 2, in<module>
>    File "PySide/QtCore.pyc", line 18, in<module>
>    File "PySide/QtCore.pyc", line 15, in __load
> ImportError: '/usr/lib/python2.6/lib-dynload/PySide/QtCore.so' not found
>
> The weird thing is, QtCore.so IS included in the application bundle: py2app copied it to the build under Contents/Resources/lib/python2.6/lib-dynload/PySide/. Is there a reason the application isn't seeing this?

You might want to post this question to the MacPython list--that's where 
the py2app experts are found.

-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From python at bdurham.com  Fri Sep  2 09:49:30 2011
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 02 Sep 2011 09:49:30 -0400
Subject: slightly OT -- LaTeX
In-Reply-To: <5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>
References: <mailman.677.1314927521.27778.python-list@python.org>
	<5f676110-1623-47a9-8cc3-47a6f0ac9831@glegroupsg2000goo.googlegroups.com>
Message-ID: <1314971370.18457.140258136609677@webmail.messagingengine.com>

Hi Alan,

Thanks for sharing that link - very interesting!
http://www.pytex.org/

Malcolm (former LaTeX/TeX user from early 90's)



From bkasterm at gmail.com  Fri Sep  2 09:54:50 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Fri, 02 Sep 2011 07:54:50 -0600
Subject: List comprehension timing difference.
References: <87zkinkcht.fsf@gmail.com>
	<mailman.676.1314925972.27778.python-list@python.org>
Message-ID: <87sjofjbh1.fsf@gmail.com>

MRAB <python at mrabarnett.plus.com> writes:

> On 02/09/2011 01:35, Bart Kastermans wrote:

>> graph = [[a,b] for a in data for b in data if d(a,b) ==1 and a<  b]

>> graph2 = []
>> for i in range (0, len(data)):
>>      for j in range(0,len(data)):
>>          if d(data[i],data[j]) == 1 and i<  j:
>>              graph2.append ([i,j])

>
> Are they actually equivalent? Does graph == graph2?
>
> The first version (list comprehension) creates a list of pairs of
> values:
>
>     [a, b]
>
> whereas the second version (for loops) creates a list of pairs of
> indexes:
>
>     [i, j]
>
> The second version has subscripting ("data[i]" and "data[j]"), which
> will slow it down.

You are absolutely right.  I had changed the code from the
equivalent:

    graph2 = []
    for i in range (0, len(data)):
        for j in range(0,len(data)):
            if d(data[i],data[j]) == 1 and i < j:
                graph2.append ([data[i],data[j]])

But then also tried the equivalent

    for a in data:
        for b in data:
            if d(a,b) == 1 and a < b:
                graph2.append([a,b])

Which does away with the indexing, and is just about exactly as
fast as the list comprehension.


That'll teach me; I almost didn't ask the question thinking it might 
be silly.  And it was, but I thought it for the wrong reason.  I tell my
students there are no stupid questions, I should listen to myself
more when I do.  Thanks!


From ting at thsu.org  Fri Sep  2 10:50:24 2011
From: ting at thsu.org (ting at thsu.org)
Date: Fri, 2 Sep 2011 07:50:24 -0700 (PDT)
Subject: List comprehension timing difference.
References: <87zkinkcht.fsf@gmail.com>
	<mailman.676.1314925972.27778.python-list@python.org>
	<87sjofjbh1.fsf@gmail.com>
Message-ID: <07906043-d732-43ca-8313-bee4746eca75@fi7g2000vbb.googlegroups.com>

On Sep 2, 9:54?am, Bart Kastermans <bkast... at gmail.com> wrote:
> if d(a,b) == 1 and a < b:

It will probably be faster if you reverse the evaluation order of that
expression.

if a<b and d(a,b)==1:

That way the d() function is called less than half the time. Of course
this assumes that a<b is a faster evaluation than d(a,b), but I think
that's true for your example.
--
// T.Hsu


From roy at panix.com  Fri Sep  2 10:53:35 2011
From: roy at panix.com (Roy Smith)
Date: Fri, 2 Sep 2011 07:53:35 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
Message-ID: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>

I have a function I want to run in a thread and return a value.  It
seems like the most obvious way to do this is to have my target
function return the value, the Thread object stash that someplace, and
return it as the return value for join().

Yes, I know there's other ways for a thread to return values (pass the
target a queue, for example), but making the return value of the
target function available would have been the most convenient.  I'm
curious why threading wasn't implemented this way.


From d_vineet at yahoo.com  Fri Sep  2 11:34:25 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Fri, 2 Sep 2011 08:34:25 -0700 (PDT)
Subject: convert python List to javascript array
Message-ID: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>

Hi !
Within a web framework, I want want to pass a python sequence (list or tuple) to client-side javascript function as an array (javascript compatible)
e.g., I have this list:
L = ['spam', 'ham', 'eggs', 12, (13.63)]
What is the correct way to convert L to?javascript array format? 

1) jsonify the list and pass it to javascript
(whether json format & javascript array are similar?)

OR
2) 
>> import array
>> y = array.array(i, L)
?then return y to javascript function
But the problem with this method is, it will give an array of basic values only.

OR
3) Any other alternative?

Thanks,
Vineet
-------------- next part --------------
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From steve+comp.lang.python at pearwood.info  Fri Sep  2 11:45:22 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 03 Sep 2011 01:45:22 +1000
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
Message-ID: <4e60fa12$0$29992$c3e8da3$5496439d@news.astraweb.com>

Roy Smith wrote:

> I have a function I want to run in a thread and return a value.  It
> seems like the most obvious way to do this is to have my target
> function return the value, the Thread object stash that someplace, and
> return it as the return value for join().
> 
> Yes, I know there's other ways for a thread to return values (pass the
> target a queue, for example), but making the return value of the
> target function available would have been the most convenient.  I'm
> curious why threading wasn't implemented this way.

Because then the code launching the thread would have to block, waiting
until the thread is completed, so it will have a result to return.


-- 
Steven



From benjamin.kaplan at case.edu  Fri Sep  2 11:50:12 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 2 Sep 2011 11:50:12 -0400
Subject: convert python List to javascript array
In-Reply-To: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
Message-ID: <CAMuTYXjN1ad4zYsC4VEBMKuXLqWOoNqLJGEPQyykuaug2izASw@mail.gmail.com>

On Fri, Sep 2, 2011 at 11:34 AM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
> Hi !
> Within a web framework, I want want to pass a python sequence (list or
> tuple) to client-side javascript function as an array (javascript
> compatible)
> e.g., I have this list:
> L = ['spam', 'ham', 'eggs', 12, (13.63)]
> What is the correct way to convert L to?javascript array format?
> 1) jsonify the list and pass it to javascript
> (whether json format & javascript array are similar?)
>
> OR
> 2)
>>> import array
>>> y = array.array(i, L)
> ?then return y to javascript function
> But the problem with this method is, it will give an array of basic values
> only.
>
> OR
> 3) Any other alternative?
>
> Thanks,
> Vineet
> --

The JavaScript Object Notation (JSON) is meant exactly for this purpose.


From patentsvnc at gmail.com  Fri Sep  2 12:19:35 2011
From: patentsvnc at gmail.com (Den)
Date: Fri, 2 Sep 2011 09:19:35 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<c287acc8-8fec-4f3d-ad64-bea090ed8eae@w28g2000yqw.googlegroups.com>
Message-ID: <4310f6ad-8aab-481b-9e68-3931f67b49b6@m4g2000pri.googlegroups.com>

On Sep 2, 5:27?am, sjm <sjms... at gmail.com> wrote:
> On Sep 1, 12:52?pm, Den <patents... at gmail.com> wrote:
>
> > Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> > is handled deep inside the OS, and I'm not trying to interrupt that.
> > But is there some way to detect that a C-A-D has been pressed?
>
> If you manage to write a program that can detect CTRL-ALT-DEL, please
> report it as a bug in Windows! ?CTRL-ALT-DEL is Windows' "secure
> attention sequence" which must only be handled by the OS.
>
> -- Steve

I have already done that, in AutoHotKey ... or at least it used to
work.  AHK can detect when a window opened.  And when CAD was pressed
the ... well, I've forgotten what it was called ... but a window
opened asking if you wanted to open the task manager, or quit or log
off or what.  Then you would know that CAD was pressed.  There was
nothing you could do to stop it, but you could at least detect that it
had been pressed.

That's why I was wondering if there was a similar technique which
could be used in Python.

Den


From patentsvnc at gmail.com  Fri Sep  2 12:20:23 2011
From: patentsvnc at gmail.com (Den)
Date: Fri, 2 Sep 2011 09:20:23 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<c287acc8-8fec-4f3d-ad64-bea090ed8eae@w28g2000yqw.googlegroups.com>
Message-ID: <2ab915f4-a0cb-42ed-8d4b-5bd16a9ee9ca@x21g2000prd.googlegroups.com>

On Sep 2, 5:27?am, sjm <sjms... at gmail.com> wrote:
> On Sep 1, 12:52?pm, Den <patents... at gmail.com> wrote:
>
> > Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> > is handled deep inside the OS, and I'm not trying to interrupt that.
> > But is there some way to detect that a C-A-D has been pressed?
>
> If you manage to write a program that can detect CTRL-ALT-DEL, please
> report it as a bug in Windows! ?CTRL-ALT-DEL is Windows' "secure
> attention sequence" which must only be handled by the OS.
>
> -- Steve

I'm not trying to hook it or stop it, just detect it.

Den


From patentsvnc at gmail.com  Fri Sep  2 12:26:12 2011
From: patentsvnc at gmail.com (Den)
Date: Fri, 2 Sep 2011 09:26:12 -0700 (PDT)
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
Message-ID: <d5a699af-83ae-48ca-b32c-3aedc4a96d2a@s2g2000prm.googlegroups.com>

On Sep 1, 8:52?am, Den <patents... at gmail.com> wrote:
> Obviously, this is a windows-based question. ?I know that Ctrl-Alt-Del
> is handled deep inside the OS, and I'm not trying to interrupt that.
> But is there some way to detect that a C-A-D has been pressed?
>
> Also, is there a corresponding key-sequence in Mac and Linux? ?And how
> might one detect those too?
>
> Den

I've been doing some more thinking on what I want.  This may be a
better explanation.  Is there a way of detecting if my program has
lost "focus" (I'm not sure the correct term)?  For example, if someone
is typing in my program, but some other program takes control (or CAD
has been pressed) I would like simply to log that.  I have no interest
in trying to hijack or interfere with anything, simply log it.

Den


From gagsl-py2 at yahoo.com.ar  Fri Sep  2 12:36:17 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 13:36:17 -0300
Subject: Handling 2.7 and 3.0 Versions of Dict
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
Message-ID: <op.v06wes1px6zn5v@lepton>

En Wed, 31 Aug 2011 22:28:09 -0300, Travis Parks <jehugaleahsa at gmail.com>  
escribi?:

> On Aug 31, 7:37 pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> Ian Kelly wrote:
>> > if sys.version_info < (3,):
>> >     getDictValues = dict.itervalues
>> > else:
>> >     getDictValues = dict.values
>>
>> > (which is basically what the OP was doing in the first place).
>>
> My problem was that I didn't understand the scoping rules. It is still
> strange to me that the getValues variable is still in scope outside
> the if/else branches.

Those if/else are at global scope. An 'if' statement does not introduce a  
new scope; so getDictValues, despite being "indented", is defined at  
global scope, and may be used anywhere in the module.

-- 
Gabriel Genellina



From usenet-nospam at seebs.net  Fri Sep  2 12:42:34 2011
From: usenet-nospam at seebs.net (Seebs)
Date: 02 Sep 2011 16:42:34 GMT
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<4e60fa12$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <slrnj621a4.ubb.usenet-nospam@guild.seebs.net>

On 2011-09-02, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> Roy Smith wrote:
>> I have a function I want to run in a thread and return a value.  It
>> seems like the most obvious way to do this is to have my target
>> function return the value, the Thread object stash that someplace, and
>> return it as the return value for join().

>> Yes, I know there's other ways for a thread to return values (pass the
>> target a queue, for example), but making the return value of the
>> target function available would have been the most convenient.  I'm
>> curious why threading wasn't implemented this way.

> Because then the code launching the thread would have to block, waiting
> until the thread is completed, so it will have a result to return.

Isn't "waiting until the thread is completed" sort of the point of join()?

-s
-- 
Copyright 2011, all wrongs reversed.  Peter Seebach / usenet-nospam at seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
I am not speaking for my employer, although they do rent some of my opinions.


From jehugaleahsa at gmail.com  Fri Sep  2 12:53:37 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 09:53:37 -0700 (PDT)
Subject: Handling 2.7 and 3.0 Versions of Dict
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
	<mailman.710.1314981394.27778.python-list@python.org>
Message-ID: <42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>

On Sep 2, 12:36?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 31 Aug 2011 22:28:09 -0300, Travis Parks <jehugalea... at gmail.com> ?
> escribi :
>
> > On Aug 31, 7:37 pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> >> Ian Kelly wrote:
> >> > if sys.version_info < (3,):
> >> > ? ? getDictValues = dict.itervalues
> >> > else:
> >> > ? ? getDictValues = dict.values
>
> >> > (which is basically what the OP was doing in the first place).
>
> > My problem was that I didn't understand the scoping rules. It is still
> > strange to me that the getValues variable is still in scope outside
> > the if/else branches.
>
> Those if/else are at global scope. An 'if' statement does not introduce a ?
> new scope; so getDictValues, despite being "indented", is defined at ?
> global scope, and may be used anywhere in the module.
>
> --
> Gabriel Genellina
>
>

Does that mean the rules would be different inside a function?


From jehugaleahsa at gmail.com  Fri Sep  2 12:59:03 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 09:59:03 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
Message-ID: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>

Hello:

I am working on an algorithms library. It provides LINQ like
functionality to Python iterators. Eventually, I plan on having
feaures that work against sequences and mappings.

I have the code up at http://code.google.com/p/py-compass.

This is my first project in Python, so I'd like some feedback. I want
to know if I am following conventions (overall style and quality of
code).

Thanks,
Travis Parks


From clp2 at rebertia.com  Fri Sep  2 13:26:15 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 2 Sep 2011 10:26:15 -0700
Subject: convert python List to javascript array
In-Reply-To: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
Message-ID: <CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>

On Fri, Sep 2, 2011 at 8:34 AM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
> Hi !
> Within a web framework, I want want to pass a python sequence (list or
> tuple) to client-side javascript function as an array (javascript
> compatible)
> e.g., I have this list:
> L = ['spam', 'ham', 'eggs', 12, (13.63)]
> What is the correct way to convert L to?javascript array format?
> 1) jsonify the list and pass it to javascript
> (whether json format & javascript array are similar?)

JSON is in fact a subset of JavaScript, and modern browsers now
include a specific API for parsing and generating it
(https://developer.mozilla.org/En/Using_native_JSON ).
Python likewise has a JSON module in the std lib:
http://docs.python.org/library/json.html

> OR
> 2)
>>> import array
>>> y = array.array(i, L)
> ?then return y to javascript function
> But the problem with this method is, it will give an array of basic values
> only.

The word "array" gets tossed around a lot by programmers. The `array`
module is not at all what you want in this case.

Cheers,
Chris
--
http://rebertia.com


From norrisd at bellsouth.net  Fri Sep  2 13:41:32 2011
From: norrisd at bellsouth.net (aMereCat)
Date: Fri, 2 Sep 2011 10:41:32 -0700 (PDT)
Subject: Tenjin and External CSS
Message-ID: <b26fd8f4-1600-4d48-89db-0f302ce9550f@t3g2000vbe.googlegroups.com>

I'm new at Python, Cherrypy and Tenjin and I can't get tenjin to
recognize external css file.  Does anyone have an example showing how
it's done?  Thanks.


From johnroth1 at gmail.com  Fri Sep  2 13:51:14 2011
From: johnroth1 at gmail.com (John Roth)
Date: Fri, 2 Sep 2011 10:51:14 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
	<mailman.658.1314887244.27778.python-list@python.org>
Message-ID: <975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>

On Sep 1, 8:26?am, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Thu, Sep 1, 2011 at 6:45 AM, John Roth <johnro... at gmail.com> wrote:
> > I personally consider this to be a wart. Some time ago I did an
> > implementation analysis. The gist is that, if self and cls were made
> > special variables that returned the current instance and class
> > respectively, then the compiler could determine whether a function was
> > an instance or class method. If it then marked the code object
> > appropriately you could get rid of all of the wrappers and the
> > attendant run-time overhead.
>
> I don't see how you could get rid of the wrappers. ?Methods would
> still need to be bound, somehow, so that code like this will work:
>
> methods = {}
> for obj in objs:
> ? ? if obj.is_flagged:
> ? ? ? ? methods[obj.user_id] = obj.do_work
> ? ? else:
> ? ? ? ? methods[obj.user_id] = obj.do_other_work
> # ...
> methods[some_user_id]()
>
> Without method wrappers, how does the interpreter figure out which
> instance is bound to the method being called?
>
> Cheers,
> Ian

Good question.

Currently the instance wrapper is created during method instantiation,
so the instance is obviously available at that point. There are two
rather obvious ways of remembering it. One is to use the invocation
stack, which has the instance. Another would be for the compiler to
create a local variable for the instance and possibly the class and
fill them in at instantiation time. Both of these require fixing the
names "self" and "cls" so the compiler knows what to do with them. The
first would require giving these two names their own bytecodes, the
second makes them simple local variables the same as the ones in the
method headers. The latter also allows them to be changed by the
method, which is probably not the world's best programming practice
although it's possible now.

John Roth




From askutt at gmail.com  Fri Sep  2 14:01:17 2011
From: askutt at gmail.com (Adam Skutt)
Date: Fri, 2 Sep 2011 11:01:17 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
Message-ID: <5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>

On Sep 2, 10:53?am, Roy Smith <r... at panix.com> wrote:
> I have a function I want to run in a thread and return a value. ?It
> seems like the most obvious way to do this is to have my target
> function return the value, the Thread object stash that someplace, and
> return it as the return value for join().
> > Yes, I know there's other ways for a thread to return values (pass the
> target a queue, for example), but making the return value of the
> target function available would have been the most convenient. ?I'm
> curious why threading wasn't implemented this way.

I assume it is because the underlying operating system APIs do not
support it.  Windows and POSIX threads only support returning an
integer when a thread exits, similar to the exit code of a process.
More importantly, there's no way to tell whether the exit code of a
thread was set by user code or by the system.  Even worse, some of
those integer values are reserved by some operating systems.  If your
thread died via an exception, it still has an error code set by the
operating system.  How would you going to distinguish those codes from
your own?

Adam


From alain at dpt-info.u-strasbg.fr  Fri Sep  2 14:23:28 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Fri, 02 Sep 2011 20:23:28 +0200
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
Message-ID: <87hb4u3isf.fsf@dpt-info.u-strasbg.fr>

Adam Skutt <askutt at gmail.com> writes:

> On Sep 2, 10:53?am, Roy Smith <r... at panix.com> wrote:
>> I have a function I want to run in a thread and return a value. ?It
>> seems like the most obvious way to do this is to have my target
>> function return the value, the Thread object stash that someplace, and
>> return it as the return value for join().
>> > Yes, I know there's other ways for a thread to return values (pass the
>> target a queue, for example), but making the return value of the
>> target function available would have been the most convenient. ?I'm
>> curious why threading wasn't implemented this way.
>
> I assume it is because the underlying operating system APIs do not
> support it.  Windows and POSIX threads only support returning an
> integer when a thread exits, similar to the exit code of a process.

Sorry, you're wrong, at least for POSIX threads:

void pthread_exit(void *value_ptr);
int pthread_join(pthread_t thread, void **value_ptr);

pthread_exit can pass anything, and that value will be retrieved with
pthread_join. Threads of a process share their address space, there is
no reason to restrict their return value to an int.

> More importantly, there's no way to tell whether the exit code of a
> thread was set by user code or by the system.  Even worse, some of
> those integer values are reserved by some operating systems.

I'm not sure what you are talking about here. Maybe you confuse threads
with processes?

Re. the original question: since you can define your own Thread
subclass, with wathever attribute you want, I guess there was no need to
use join() to communicate the result. The Thread's run() can store its
result in an attribute, and the "client" can get it from the same
attribute after a successful call to join().

-- Alain.


From Tim.Arnold at sas.com  Fri Sep  2 14:43:53 2011
From: Tim.Arnold at sas.com (Tim Arnold)
Date: Fri, 02 Sep 2011 14:43:53 -0400
Subject: sqlite3 with context manager
Message-ID: <j3r859$rnt$1@foggy.unx.sas.com>

Hi,
I'm using the 'with' context manager for a sqlite3 connection:

with sqlite3.connect(my.database,timeout=10) as conn:
             conn.execute('update config_build set datetime=?,result=?
where id=?',
                               (datetime.datetime.now(), success,
self.b['id']))

my question is what happens if the update fails? Shouldn't it throw an
exception?

I ask because apparently something went wrong yesterday and the code
never updated but I never got any warning.  I rebooted the machine and
everything is okay now, but I'd like to understand what happened.

thanks,
--Tim


From vinay_sajip at yahoo.co.uk  Fri Sep  2 14:47:33 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 11:47:33 -0700 (PDT)
Subject: ANN: A new version (0.2.8) of the Python module which wraps GnuPG has
	been released.
Message-ID: <d02fd671-a3fe-4056-a706-2bfe2b2d5e2c@a7g2000yqb.googlegroups.com>

A new version of the Python module which wraps GnuPG has been
released.

What Changed?
=============
This is a minor enhancement and bug-fix release. See the project
website ( http://code.google.com/p/python-gnupg/ ) for more
information. Summary:

Better support for status messages from GnuPG.
The fixing of some Unicode encoding problems.
Quoted some command-line arguments to gpg for increased safety.

The current version passes all tests on Windows (CPython 2.4, 2.5,
2.6, 3.1, 2.7 and Jython 2.5.1) and Ubuntu (CPython 2.4, 2.5, 2.6,
2.7, 3.0, 3.1, 3.2). On Windows, GnuPG 1.4.11 has been used for the
tests.

What Does It Do?
================
The gnupg module allows Python programs to make use of the
functionality provided by the Gnu Privacy Guard (abbreviated GPG or
GnuPG). Using this module, Python programs can encrypt and decrypt
data, digitally sign documents and verify digital signatures, manage
(generate, list and delete) encryption keys, using proven Public Key
Infrastructure (PKI) encryption technology based on OpenPGP.

This module is expected to be used with Python versions >= 2.4, as it
makes use of the subprocess module which appeared in that version of
Python. This module is a newer version derived from earlier work by
Andrew Kuchling, Richard Jones and Steve Traugott.

A test suite using unittest is included with the source distribution.

Simple usage:

>>> import gnupg
>>> gpg = gnupg.GPG(gnupghome='/path/to/keyring/directory')
>>> gpg.list_keys()
[{
  ...
  'fingerprint': 'F819EE7705497D73E3CCEE65197D5DAC68F1AAB2',
  'keyid': '197D5DAC68F1AAB2',
  'length': '1024',
  'type': 'pub',
  'uids': ['', 'Gary Gross (A test user) <gary.gr... at gamma.com>']},
 {
  ...
  'fingerprint': '37F24DD4B918CC264D4F31D60C5FEFA7A921FC4A',
  'keyid': '0C5FEFA7A921FC4A',
  'length': '1024',
  ...
  'uids': ['', 'Danny Davis (A test user) <danny.da... at delta.com>']}]
>>> encrypted = gpg.encrypt("Hello, world!", ['0C5FEFA7A921FC4A'])
>>> str(encrypted)
'-----BEGIN PGP MESSAGE-----\nVersion: GnuPG v1.4.9 (GNU/Linux)\n
\nhQIOA/6NHMDTXUwcEAf
...
-----END PGP MESSAGE-----\n'
>>> decrypted = gpg.decrypt(str(encrypted), passphrase='secret')
>>> str(decrypted)
'Hello, world!'
>>> signed = gpg.sign("Goodbye, world!", passphrase='secret')
>>> verified = gpg.verify(str(signed))
>>> print "Verified" if verified else "Not verified"
'Verified'

For more information, visit http://code.google.com/p/python-gnupg/ -
as always, your feedback is most welcome (especially bug reports,
patches and suggestions for improvement). Enjoy!

Cheers

Vinay Sajip
Red Dove Consultants Ltd.


From askutt at gmail.com  Fri Sep  2 14:53:43 2011
From: askutt at gmail.com (Adam Skutt)
Date: Fri, 2 Sep 2011 11:53:43 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
Message-ID: <bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>

On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
wrote:
> Sorry, you're wrong, at least for POSIX threads:
>
> void pthread_exit(void *value_ptr);
> int pthread_join(pthread_t thread, void **value_ptr);
>
> pthread_exit can pass anything, and that value will be retrieved with
> pthread_join.

No, it can only pass a void*, which isn't much better than passing an
int.  Passing a void* is not equivalent to passing anything, not even
in C.  Moreover, specific values are still reserved, like
PTHREAD_CANCELLED. Yes, it was strictly inappropriate for me to say
both return solely integers, but my error doesn't meaningful alter my
description of the situation.  The interface provided by the
underlying APIs is not especially usable for arbitrary data transfer.
Doubly so when we're discussing something like Python's threading
module.

> I'm not sure what you are talking about here. Maybe you confuse threads
> with processes?

Windows threads have exit codes, just like processes.  At least one
code is reserved and cannot be used by the programmer.

Adam


From gagsl-py2 at yahoo.com.ar  Fri Sep  2 15:10:41 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 16:10:41 -0300
Subject: Help required accessing dictionary
References: <54e7c93d35c11cdf72cee56a8a1c5abc@edss.co.in>
Message-ID: <op.v063j3epx6zn5v@lepton>

En Wed, 31 Aug 2011 22:46:54 -0300, <mrinalini at edss.co.in> escribi?:

>  I need to access the dictionary of the script that I am running through
>  my vc++ application by embedding python.
>  I am linking to python dynamically. I want to obtain the dictionary of
>  the script and access the variables declared in the script.
>  However, with the PyObject * that I get from the dictionary, I am not
>  able to find the type of the object. The reason being that
>  GetProcAddress to PyInt_Check returns a NULL. The same thing with
>  PyFloat_Check and so on. I think this is because they are macros and  
>  not
>  exported functions.
>
>  What can be done to be able to perform these checks without statically
>  linking to the pyhon lib ?

Just include python.h
PyInt_Check is completely implemented as a macro, it doesn't call any  
function.

/* from intobject.h */
#define PyInt_Check(op) \
		 PyType_FastSubclass((op)->ob_type, Py_TPFLAGS_INT_SUBCLASS)

/* from object.h */
#define PyType_FastSubclass(t,f)  PyType_HasFeature(t,f)
#define PyType_HasFeature(t,f)  (((t)->tp_flags & (f)) != 0)

-- 
Gabriel Genellina



From fnautaNO at SPAMsolfon.nl  Fri Sep  2 15:12:36 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 21:12:36 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net>
	<mailman.711.1314983727.27778.python-list@python.org>
Message-ID: <9cco6uFvh4U1@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.711.1314983727.27778.python-list at python.org...
> On Fri, 2 Sep 2011 14:19:32 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>
>>
>> In the config file it says:
>> "# main directory
>> directory = \Webdav"
>>
> I think that's the line that should have your e:/wwwroot
> specification
> -- 

Sorry!
It used to have.
But as it did not work, with the same error message, it could not find 
E:\wwwroot, I changed it into \Webdav.
Ofcourse, in the command line as well. Later on I left the D specification 
out in the command line.
Perhaps another drive letter might cause the problem, so in this case I kept 
it on the same partition. But I still got the same error.

Fokke 




From fnautaNO at SPAMsolfon.nl  Fri Sep  2 15:21:03 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 21:21:03 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
Message-ID: <9ccoqkF5efU1@mid.individual.net>


"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:86b084e0-09a8-4997-9e0c-4526d7851e1d at s2g2000vby.googlegroups.com...
On Sep 2, 1:19 pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in 
> messagenews:mailman.687.1314941410.27778.python-list at python.org...
>
> > On Thu, 1 Sep 2011 12:30:43 +0200, "Fokke Nauta"
> > <fnaut... at SPAMsolfon.nl> declaimed the following in
> > gmane.comp.python.general:
>
> >> "Dennis Lee Bieber" <wlfr... at ix.netcom.com> wrote in message
> >>news:mailman.643.1314851358.27778.python-list at python.org...
>
> >> > Next, if you'd read further and didn't take the comment as the
> >> > instruction. set
> >> > firstrun=1
>
> >> I did
>
> >> > to tell the server this is the first time it is being run - IT WILL
> >> > create the database table (after the first start, reset the flag to 0
> >> > to
> >> > speed up later runs).
>
> >> It didn't create the table. The database kept empty.
>
> > Odd -- but then, I'm not running it myself, and wasn't up to reading
> > all the code to see what path it takes.
>
> It's only for experimenting with calendar software, so authorization is 
> not
> a point.
> So I forget about MySQL.
> >> > Later in the config file set
> >> > mysql_auth=1
> >> > to enable the use of MySQL, and set the admin user/password to what 
> >> > you
> >> > plan to have it use.
>
> >> I did
>
> >> > You probably want to set
> >> > daemonize=1
> >> > (maybe after first run)
>
> >> I left this to 0.
>
> >> > Oh, and don't forget to set the main data directory and any
> >> > port/host changes.
>
> >> I left host and port as they were. The main directory is e:\wwwroot
>
> >> > Start the server - it should connect to MySQL, create the table, and
> >> > add the admin user to the table.
>
> >> I started the server with server.py (in
> >> D:\Python27\WebDAV\PyWebDAV\DAVServer) -D e:/wwwroot -m -c config.ini
>
> > If the main directory is already in the config file, you probably
> > don't need to specify it on the command line...
>
> OK
>
> > And... could there be
> > something in the code where overriding the directory by command line
> > changes where it looks for the config file? (Just guessing at this
> > point).
>
> Possibly.
> I tried this:
> server.py -n -c config.ini
> Once again, the server is up and running and when I am logging in with my
> browser (10.0.0.140:8081) I can see information showing up at the command
> prompt, showing somebody is logging is, but the same error:
> "fshandler:get_data: \Webdav not found". During starting up the server
> mentioned: "pywebdav:Serving data from \Webdav".
>
> In the config file it says:
> "# main directory
> directory = \Webdav"
>
> Perhaps my Python configuration is at fault.
>
> Fokke

Is the path supposed to be absolute? In which case you'd need to have:
directory=C:\path\to\Webdav

instead of just
directory=\Webdav

I tried:
directory=D:\Webdav
directory=D:/Webdav

To no avail.
It didn.t make any difference.

I surely believe my WebDAV installation is at fault.

Fokke




From fnautaNO at SPAMsolfon.nl  Fri Sep  2 15:24:02 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Fri, 2 Sep 2011 21:24:02 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net>
	<mailman.703.1314969082.27778.python-list@python.org>
Message-ID: <9ccoqkF5efU2@mid.individual.net>

<python at bdurham.com> wrote in message 
news:mailman.703.1314969082.27778.python-list at python.org...
> Hi Fokke,
>
> Disclaimer: I have no experience with the Python WebDAV package you're
> using.
>
> But a thought:
>
>> In the config file it says:
>> "# main directory
>> directory = \Webdav"
>
> Perhaps you should qualify your directory path with a drive letter?
>
> I would try this 2 ways:
>
> directory = E:\Webdav
>
> And if that doesn't work:
>
> directory = E:/Webdav
>
> My thinking about the 2nd example is that perhaps the \W is getting
> interpreted as a control character vs. "backslash" "W".
>

I tried:
directory=D:\Webdav
directory=D:/Webdav

To no avail.
It didn't make any difference.

I surely believe my WebDAV installation is at fault.

And D: is the same partition as where Python is, D:\Python27

Fokke





From guido at python.org  Fri Sep  2 15:30:34 2011
From: guido at python.org (Guido van Rossum)
Date: Fri, 2 Sep 2011 12:30:34 -0700
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>

On Fri, Sep 2, 2011 at 12:28 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:
> Gabriel AHTUNE writes:
> ?> So can be done with this syntax:
> ?>
> ?> > x = firstpart * secondpart ?+ ?#line breaks here
> ?> > anotherpart + #continue
> ?> > stillanother #continue on.
> ?>
> ?> after a "+" operator the line is clearly not finished yet.
>
> Sure, but IIRC one design principle of Python is that the keyword that
> denotes the syntax should be the first thing on the line, making it
> easy to scan down the left side of the code to see the syntactic
> structure. ?The required indentation of the controlled suite also
> helps emphasize that keyword.

That's true for *statements* (except assignments and calls).

> Analogously, if operators are going to denote continuation, they
> should come first on the line.

That doesn't follow. My preferred style is actually to put the binary
operator at the end of the line. This also matches the prevailing
style for breaking lines after commas (a comma can be seen as a kind
of binary operator).

> I just don't think this idea is going anywhere. ?Explicit continuation
> with backslash or implicit continuation of parenthesized expressions
> is just not that heavy a price to pay. ?Perhaps historically some of
> these ideas could have been implemented, but now they're just going to
> confuse a host of editors and code analysis tools.

Totally agreed that this isn't going to happen.

-- 
--Guido van Rossum (python.org/~guido)


From sahil at FreeBSD.org  Fri Sep  2 15:56:46 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Fri, 02 Sep 2011 15:56:46 -0400
Subject: idiomatic analogue of Perl's: while (<>) { ... }
In-Reply-To: <j3pp0q$6n4$1@dough.gmane.org>
References: <20110901045650.GA3466@magic.hamla.org>
	<j3pp0q$6n4$1@dough.gmane.org>
Message-ID: <4E6134FE.9060309@FreeBSD.org>

Dennis Lee Bieber wrote:
> On Thu, 1 Sep 2011 00:56:50 -0400, Sahil Tandon<sahil at FreeBSD.org>
>> # process input, line-by-line, and print responses after parsing input
>> while 1:
>>    rval = parse(raw_input())
>>    if rval == None:
>
> 	There is only ONE "None" object so the preferred method is
>
> 	if rval is None:

Understood; thanks for that enlightenment.

> 	Note: I don't see any exit handler/condition...

Indeed.  I excluded such things in the interest of brevity, to focus the 
discussion on my question. :)

-- 
Sahil Tandon <sahil at FreeBSD.org>



From gagsl-py2 at yahoo.com.ar  Fri Sep  2 16:06:57 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 17:06:57 -0300
Subject: Invoking profile from command line prevent my sys.path
	modification
References: <CAFEUn8YAG5P92XTHaubMuX_NFG0b28+yhFkR3yf2QxQ4u5gFpQ@mail.gmail.com>
Message-ID: <op.v0655vaux6zn5v@lepton>

En Thu, 01 Sep 2011 07:51:43 -0300, Ya?ar Arabac? <yasar11732 at gmail.com>  
escribi?:

> I am new to profile module, so I am sorry if this is an absolute beginner
> question. In order to my code to run, I need to add a directory to  
> sys.path.
> When I invole python -m profile myfile.py, my code won't work, saying  
> that
> the thing that is supposed to be in path, isn't. Code works fine without
> profiling. Profiling works if I write it into the file, but I don't  
> prefer
> doing that, if that is possible.

You may set the PYTHONPATH environment variable, just for the profiling  
session.

http://docs.python.org/install/index.html#modifying-python-s-search-path

-- 
Gabriel Genellina



From ian.g.kelly at gmail.com  Fri Sep  2 16:09:26 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 2 Sep 2011 14:09:26 -0600
Subject: Algorithms Library - Asking for Pointers
In-Reply-To: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
Message-ID: <CALwzid=og0t+JP5xgkfXEyz+s+GkVEULOqgE0gTk_Fhrcqotmw@mail.gmail.com>

On Fri, Sep 2, 2011 at 10:59 AM, Travis Parks <jehugaleahsa at gmail.com> wrote:
> Hello:
>
> I am working on an algorithms library. It provides LINQ like
> functionality to Python iterators. Eventually, I plan on having
> feaures that work against sequences and mappings.
>
> I have the code up at http://code.google.com/p/py-compass.
>
> This is my first project in Python, so I'd like some feedback. I want
> to know if I am following conventions (overall style and quality of
> code).

Sure, here are my comments.

In the "forever" and "__forever" functions, your use of the term
"generator" is confusing.  "__forever" is a generator function,
because it has a yield statement.  Its argument, called "generator",
appears to be a callable, not a generator or even necessarily a
generator function.  Also, note that __forever(lambda: value) is
functionally equivalent to the more efficient itertools.repeat(value).

The staticmethod __next(iterator) accesses the class it is defined in,
which suggests that it might be better written as a classmethod
__next(cls, iterator).

Each of the LINQ-style methods is divided into two parts: the public
method that contains the docstring and some argument checks, and a
private staticmethod that contains the implementation.  I'm not
certain what the purpose of that is.  If it's to facilitate overriding
the implementation in subclasses, then you need to change the names of
the private methods to start with only one _ character so that they
won't be mangled by the compiler.

The comments before each method that only contain the name of the
immediately following method are redundant.

aggregate: the default aggregator is unintuitive to me.  I would make
it a required field and add a separate method called sum that calls
aggregate with the operator.add aggregator.
Also, the implementation doesn't look correct.  Instead of passing in
each item to the aggregator, you're passing in the number of items
seen so far?  The LINQ Aggregate method is basically reduce, so rather
than reinvent the wheel I would suggest this:

# MISSING is a unique object solely defined to represent missing arguments.
# Unlike None we can safely assume it will never be passed as actual data.
MISSING = object()

def aggregate(self, aggregator, seed=MISSING):
    if seed is self.MISSING:
        return reduce(aggregator, self._iterable)
    else:
        return reduce(aggregator, self._iterable, seed)

Note for compatibility that in Python 3 the reduce function has been
demoted from a builtin to a member of the functools module.

any: the name of this method could cause some confusion with the "any"
builtin that does something a bit different.

compare: the loop would more DRY as a for loop:

def __compare(first, second, comparison):
    for firstval, secondval in itertools.izip_longest(first, second,
fillvalue=self.MISSING):
        if firstval is self.MISSING:
            return -1
        elif secondval is self.MISSING:
            return 1
        else:
            result = comparison(firstval, secondval)
            if result != 0:
                return result
    return 0

concatenate: again, no need to reinvent the wheel.  This should be
more efficient:

def concatenate(self, other):
    return extend(itertools.chain(self.__iterable, other))

equals: could be just "return self.compare(other, comparison) == 0"

__last: the loop could be a for loop:

        # assume we're looking at the last item and try moving to the next
        item = result.Value
        for item in iterator: pass
        return item

lastOrDefault: there's a lot of repeated logic here.  This could just be:

def lastOrDefault(self, default=None):
    try:
        return self.last()
    except ValueError:
        return default

map / forEach: .NET has to separate these into separate methods due to
static typing.  It seems a bit silly to have both of them in Python.
Also, map would be more efficient as "return itertools.imap(mapper,
self.__iterable)"

max / min: it would be more efficient to use the builtin:
def max(self, key):
    return max(self.__iterable, key=key)
If somebody really needs to pass a comparison function instead of a
key function, they can use functools.cmp_to_key.

randomSamples: a more canonical way to pass the RNG would be to pass
an instance of random.Random rather than an arbitrary function. Then
to get a random integer you can just call generator.randrange(total).
Note that for the default you can just use the random module itself,
which provides default implementations of all the Random methods.
Also, for loops:

    def __randomSamples(iterable, sampleCount, generator):
        samples = []
        iterator = iter(iterable)
        # fill up the samples with the items from the beginning of the iterable
        for i, value in zip(xrange(sampleCount), iterator):
            samples.append(value)
        # replace items if the generated number is less than the total
        total = len(samples)
        for value in iterator:
            total += 1
            index = generator.randrange(total)
            if index < len(samples):
                samples[index] = result
        return samples

__reverse: you could just "return reversed(list(iterable))"

__rotateLeft:
def __rotateLeft(iterable, shift):
    iterator = iter(iterable)
    front = list(itertools.islice(iterator, shift))
    return itertools.chain(iterator, front)

skipWhile: suggest using itertools.dropwhile
take: suggest using itertools.islice
takeWhile: suggest using itertools.takewhile
__toList: "return list(iterable)"
__toSet: "return set(iterable)"
__toTuple: "return tuple(iterable)".  Note that as currently written
this actually returns a generator, not a tuple.
__where: suggest using itertools.ifilter
__zip: suggest using a for loop over itertools.izip(first, second)

Lookup: is inconsistent.  The overridden __iter__ method returns an
iterator over the values of the groups, but all the inherited methods
are going to iterate over the keys.  Probably you want to pass
groups.values() to the superclass __init__ method.

Cheers,
Ian


From nospam at torek.net  Fri Sep  2 16:14:56 2011
From: nospam at torek.net (Chris Torek)
Date: 2 Sep 2011 20:14:56 GMT
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
Message-ID: <j3rdg00fmp@news6.newsguy.com>

>On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
>wrote:
>> Sorry, you're wrong, at least for POSIX threads:
>>
>> void pthread_exit(void *value_ptr);
>> int pthread_join(pthread_t thread, void **value_ptr);
>>
>> pthread_exit can pass anything, and that value will be retrieved with
>> pthread_join.

In article <bf50c8e1-1476-41e1-b2bc-61e329bfa5be at s12g2000yqm.googlegroups.com>
Adam Skutt  <askutt at gmail.com> wrote:
>No, it can only pass a void*, which isn't much better than passing an
>int.

It is far better than passing an int, although it leaves you with
an annoying storage-management issue, and sidesteps any reasonable
attempts at type-checking (both of which are of course "par for
the course" in C).  For instance:

    struct some_big_value {
        ... lots of stuff ...
    };
    struct some_big_value storage_management_problem[SIZE];
    ...
    void *func(void *initial_args) {
        ...
    #ifdef ONE_WAY_TO_DO_IT
        pthread_exit(&storage_management_problem[index]);
        /* NOTREACHED */
    #else /* the other way */
        return &storage_management_problem[index];
    #endif
    }
    ...
        int error;
        pthread_t threadinfo;
        pthread_attr_t attr;
        ...
        pthread_attr_init(&attr);
        /* set attributes if desired */
        error = pthread_create(&threadinfo, &attr, func, &args_to_func);
        if (error) {
            ... handle error ...
        } else {
            ...
            void *rv;
            result = pthread_join(&threadinfo, &rv);
            if (rv == PTHREAD_CANCELED) {
                ... the thread was canceled ...
            } else {
                struct some_big_value *ret = rv;
                ... work with ret->field ...
            }
        }

(Or, do dynamic allocation, and have a struct with a distinguishing
ID followed by a union of multiple possible values, or a flexible
array member, or whatever.  This means you can pass any arbitrary
data structure back, provided you can manage the storage somehow.)

>Passing a void* is not equivalent to passing anything, not even
>in C.  Moreover, specific values are still reserved, like
>PTHREAD_CANCELLED.

Some manual pages are clearer about this than others.  Here is one
that I think is not bad:

    The symbolic constant PTHREAD_CANCELED expands to a constant
    expression of type (void *), whose value matches no pointer to
    an object in memory nor the value NULL.

So, provided you use pthread_exit() "correctly" (always pass either
NULL or the address of some actual object in memory), the special
reserved value is different from all of "your" values.

(POSIX threads are certainly klunky, but not all *that* badly designed
given the constraints.)

>>Re. the original question: since you can define your own Thread
>>subclass, with wathever attribute you want, I guess there was no need to
>>use join() to communicate the result. The Thread's run() can store its
>>result in an attribute, and the "client" can get it from the same
>>attribute after a successful call to join().

For that matter, you can use the following to get what the OP asked
for.  (Change all the instance variables to __-prefixed versions
if you want them to be Mostly Private.)

import threading

class ValThread(threading.Thread):
    "like threading.Thread, but the target function's return val is captured"
    def __init__(self, group=None, target=None, name=None,
            args=(), kwargs=None, verbose=None):
        super(ValThread, self).__init__(group, None, name, None, None, verbose)
        self.value = None
        self.target = target
        self.args = args
        self.kwargs = {} if kwargs is None else kwargs

    def run(self):
        "run the thread"
        if self.target:
            self.value = self.target(*self.args, **self.kwargs)

    def join(self, timeout = None):
        "join, then return value set by target function"
        super(ValThread, self).join(timeout)
        return self.value
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From tjreedy at udel.edu  Fri Sep  2 16:22:35 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 02 Sep 2011 16:22:35 -0400
Subject: Handling 2.7 and 3.0 Versions of Dict
In-Reply-To: <42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
	<mailman.710.1314981394.27778.python-list@python.org>
	<42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>
Message-ID: <j3rdvq$hns$1@dough.gmane.org>

On 9/2/2011 12:53 PM, Travis Parks wrote:
> On Sep 2, 12:36 pm, "Gabriel Genellina"<gagsl-... at yahoo.com.ar>

>> Those if/else are at global scope. An 'if' statement does not introduce a
>> new scope; so getDictValues, despite being "indented", is defined at
>> global scope, and may be used anywhere in the module.

> Does that mean the rules would be different inside a function?

Yes. Inside a function, you would have to add
     global getDictValues
before the if statement in order for the assignments to have global effect.

-- 
Terry Jan Reedy



From gagsl-py2 at yahoo.com.ar  Fri Sep  2 16:29:59 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 02 Sep 2011 17:29:59 -0300
Subject: Handling 2.7 and 3.0 Versions of Dict
References: <50924476-9ada-487e-bd4b-5b77bce11d5b@gz5g2000vbb.googlegroups.com>
	<4E5E051B.8060002@v.loewis.de>
	<mailman.611.1314805519.27778.python-list@python.org>
	<9c7utuF8q8U1@mid.individual.net>
	<93c5378e-03f8-4764-96e8-2c3e8568baec@z8g2000yqe.googlegroups.com>
	<mailman.710.1314981394.27778.python-list@python.org>
	<42b6b7cb-d659-4921-bec9-6a43671848e2@s20g2000yql.googlegroups.com>
Message-ID: <op.v06679kex6zn5v@lepton>

En Fri, 02 Sep 2011 13:53:37 -0300, Travis Parks <jehugaleahsa at gmail.com>  
escribi?:

> On Sep 2, 12:36 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 31 Aug 2011 22:28:09 -0300, Travis Parks  
>> <jehugalea... at gmail.com> escribi :
>>
>> > On Aug 31, 7:37 pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> >> Ian Kelly wrote:
>> >> > if sys.version_info < (3,):
>> >> >     getDictValues = dict.itervalues
>> >> > else:
>> >> >     getDictValues = dict.values
>>
>> >> > (which is basically what the OP was doing in the first place).
>>
>> > My problem was that I didn't understand the scoping rules. It is still
>> > strange to me that the getValues variable is still in scope outside
>> > the if/else branches.
>>
>> Those if/else are at global scope. An 'if' statement does not introduce  
>> a new scope; so getDictValues, despite being "indented", is defined at  
>> global scope, and may be used anywhere in the module.
>
> Does that mean the rules would be different inside a function?

Yes: a function body *does* create a new scope, as well as the class  
statement. See
http://docs.python.org/reference/executionmodel.html

-- 
Gabriel Genellina



From ian.g.kelly at gmail.com  Fri Sep  2 16:30:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 2 Sep 2011 14:30:14 -0600
Subject: Why do class methods always need 'self' as the first parameter?
In-Reply-To: <975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
	<mailman.658.1314887244.27778.python-list@python.org>
	<975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>
Message-ID: <CALwzidmxpPUYZx3Tx5DZFHL8m_sAu4mL8t3uneepyk+ep6vOiw@mail.gmail.com>

On Fri, Sep 2, 2011 at 11:51 AM, John Roth <johnroth1 at gmail.com> wrote:
>> I don't see how you could get rid of the wrappers. ?Methods would
>> still need to be bound, somehow, so that code like this will work:
>>
>> methods = {}
>> for obj in objs:
>> ? ? if obj.is_flagged:
>> ? ? ? ? methods[obj.user_id] = obj.do_work
>> ? ? else:
>> ? ? ? ? methods[obj.user_id] = obj.do_other_work
>> # ...
>> methods[some_user_id]()
>>
>> Without method wrappers, how does the interpreter figure out which
>> instance is bound to the method being called?
>>
>> Cheers,
>> Ian
>
> Good question.
>
> Currently the instance wrapper is created during method instantiation,
> so the instance is obviously available at that point. There are two
> rather obvious ways of remembering it. One is to use the invocation
> stack, which has the instance. Another would be for the compiler to
> create a local variable for the instance and possibly the class and
> fill them in at instantiation time. Both of these require fixing the
> names "self" and "cls" so the compiler knows what to do with them. The
> first would require giving these two names their own bytecodes, the
> second makes them simple local variables the same as the ones in the
> method headers. The latter also allows them to be changed by the
> method, which is probably not the world's best programming practice
> although it's possible now.

That's not what I asked.  Both of those options are storing the
instance within a stack frame, once it's been called.  I'm asking how
you would remember the instance during the interval from the time when
the method
is accessed until when it has been called.

In the code above, the method is accessed just before it is stored in
the dictionary.  That is when the method wrapper is currently created,
and the instance is available.  It is not called until much later,
possibly not even within the same function.  How would you remember
the instance over that period without wrapping the function?

Cheers,
Ian


From steve+comp.lang.python at pearwood.info  Fri Sep  2 16:49:17 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 03 Sep 2011 06:49:17 +1000
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<4e60fa12$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<slrnj621a4.ubb.usenet-nospam@guild.seebs.net>
Message-ID: <4e61414e$0$29994$c3e8da3$5496439d@news.astraweb.com>

Seebs wrote:

> On 2011-09-02, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
[...]
>> Because then the code launching the thread would have to block, waiting
>> until the thread is completed, so it will have a result to return.
> 
> Isn't "waiting until the thread is completed" sort of the point of join()?

Doh!

I mean, well done, you have passed my little test!

<wink>



-- 
Steven



From rosuav at gmail.com  Fri Sep  2 17:47:54 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 3 Sep 2011 07:47:54 +1000
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <d5a699af-83ae-48ca-b32c-3aedc4a96d2a@s2g2000prm.googlegroups.com>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<d5a699af-83ae-48ca-b32c-3aedc4a96d2a@s2g2000prm.googlegroups.com>
Message-ID: <CAPTjJmovMvun9UYWCWHvDbequFN=aAWpBo8aCtB2eAWKT+LyHA@mail.gmail.com>

On Sat, Sep 3, 2011 at 2:26 AM, Den <patentsvnc at gmail.com> wrote:
> I've been doing some more thinking on what I want. ?This may be a
> better explanation. ?Is there a way of detecting if my program has
> lost "focus" (I'm not sure the correct term)? ?For example, if someone
> is typing in my program, but some other program takes control (or CAD
> has been pressed) I would like simply to log that. ?I have no interest
> in trying to hijack or interfere with anything, simply log it.

Ah, then yes most definitely! If you're writing a GUI program, a
LostFocus event is a normal thing to be able to catch.

Now, if you're writing a console program, that mightn't be so easy.
But certainly you can detect loss of focus to any window that you
control.

ChrisA


From askutt at gmail.com  Fri Sep  2 18:02:08 2011
From: askutt at gmail.com (Adam Skutt)
Date: Fri, 2 Sep 2011 15:02:08 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
	<j3rdg00fmp@news6.newsguy.com>
Message-ID: <2c0123f1-f776-45af-b39e-a802f2009e7d@y21g2000yqy.googlegroups.com>

On Sep 2, 4:14?pm, Chris Torek <nos... at torek.net> wrote:
> In article <bf50c8e1-1476-41e1-b2bc-61e329bfa... at s12g2000yqm.googlegroups.com>
> Adam Skutt ?<ask... at gmail.com> wrote:
>
> >No, it can only pass a void*, which isn't much better than passing an
> >int.
>
> It is far better than passing an int, although it leaves you with
> an annoying storage-management issue, and sidesteps any reasonable
> attempts at type-checking (both of which are of course "par for
> the course" in C).

And when written out, makes it sound distinctly worse than passing an
int :p.  And let's not kid ourselves, unless you're a C programmer, it
is distinctly worse than passing an int.  Heck, your example (snipped)
goes out of your way to unnecessarily leverage the functionality
provided by pthreads.

> Some manual pages are clearer about this than others. ?Here is one
> that I think is not bad:
>
> ? ? The symbolic constant PTHREAD_CANCELED expands to a constant
> ? ? expression of type (void *), whose value matches no pointer to
> ? ? an object in memory nor the value NULL.
>
> So, provided you use pthread_exit() "correctly" (always pass either
> NULL or the address of some actual object in memory), the special
> reserved value is different from all of "your" values.

Unfortunately, I'm not sure all implementations behave that way.  Not
that cancellation is really worth bothering with anyway, but it's a
pretty nasty corner case.

Adam


From johnroth1 at gmail.com  Fri Sep  2 18:30:35 2011
From: johnroth1 at gmail.com (John Roth)
Date: Fri, 2 Sep 2011 15:30:35 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<42e335a7-b872-4229-ae02-13d61b7fab35@w22g2000prj.googlegroups.com>
	<mailman.658.1314887244.27778.python-list@python.org>
	<975cd42a-00b0-4d2e-9f22-95b4021a7fbb@g32g2000pri.googlegroups.com>
	<mailman.721.1314995446.27778.python-list@python.org>
Message-ID: <d65b4506-f33d-4a79-87fd-4f3d74d89fa7@e34g2000prn.googlegroups.com>

On Sep 2, 2:30?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Fri, Sep 2, 2011 at 11:51 AM, John Roth <johnro... at gmail.com> wrote:
> >> I don't see how you could get rid of the wrappers. ?Methods would
> >> still need to be bound, somehow, so that code like this will work:
>
> >> methods = {}
> >> for obj in objs:
> >> ? ? if obj.is_flagged:
> >> ? ? ? ? methods[obj.user_id] = obj.do_work
> >> ? ? else:
> >> ? ? ? ? methods[obj.user_id] = obj.do_other_work
> >> # ...
> >> methods[some_user_id]()
>
> >> Without method wrappers, how does the interpreter figure out which
> >> instance is bound to the method being called?
>
> >> Cheers,
> >> Ian
>
> > Good question.
>
> > Currently the instance wrapper is created during method instantiation,
> > so the instance is obviously available at that point. There are two
> > rather obvious ways of remembering it. One is to use the invocation
> > stack, which has the instance. Another would be for the compiler to
> > create a local variable for the instance and possibly the class and
> > fill them in at instantiation time. Both of these require fixing the
> > names "self" and "cls" so the compiler knows what to do with them. The
> > first would require giving these two names their own bytecodes, the
> > second makes them simple local variables the same as the ones in the
> > method headers. The latter also allows them to be changed by the
> > method, which is probably not the world's best programming practice
> > although it's possible now.
>
> That's not what I asked. ?Both of those options are storing the
> instance within a stack frame, once it's been called. ?I'm asking how
> you would remember the instance during the interval from the time when
> the method
> is accessed until when it has been called.
>
> In the code above, the method is accessed just before it is stored in
> the dictionary. ?That is when the method wrapper is currently created,
> and the instance is available. ?It is not called until much later,
> possibly not even within the same function. ?How would you remember
> the instance over that period without wrapping the function?
>
> Cheers,
> Ian

I see what you're saying now - I didn't get your example the first
time. So the optimization of eliminating the instance wrapper is only
possible if it's retrieved via the instance and then called
immediately. That would seem to be a useful optimization if it was
possible - I wonder if PyPy is doing it since they've got that fancy
JIT, and it would seem that an immediate call after retrieving the
method is overwhelmingly more frequent than saving it for later.

I think it's still true that calling the underlying function object
through the instance wrapper requires remaking the parameter list,
which seems to be another piece of unnecessary overhead, unless
there's a fast path through the call machinery that treats the
instance specially.

It does, however, decouple the two issues so I can't claim the
optimization as a benefit. Drat.

John Roth


From jehugaleahsa at gmail.com  Fri Sep  2 18:49:03 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 15:49:03 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
Message-ID: <8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>

On Sep 2, 4:09?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Fri, Sep 2, 2011 at 10:59 AM, Travis Parks <jehugalea... at gmail.com> wrote:
> > Hello:
>
> > I am working on an algorithms library. It provides LINQ like
> > functionality to Python iterators. Eventually, I plan on having
> > feaures that work against sequences and mappings.
>
> > I have the code up athttp://code.google.com/p/py-compass.
>
> > This is my first project in Python, so I'd like some feedback. I want
> > to know if I am following conventions (overall style and quality of
> > code).
>
> Sure, here are my comments.
>
> In the "forever" and "__forever" functions, your use of the term
> "generator" is confusing. ?"__forever" is a generator function,
> because it has a yield statement. ?Its argument, called "generator",
> appears to be a callable, not a generator or even necessarily a
> generator function. ?Also, note that __forever(lambda: value) is
> functionally equivalent to the more efficient itertools.repeat(value).
>
> The staticmethod __next(iterator) accesses the class it is defined in,
> which suggests that it might be better written as a classmethod
> __next(cls, iterator).
>
> Each of the LINQ-style methods is divided into two parts: the public
> method that contains the docstring and some argument checks, and a
> private staticmethod that contains the implementation. ?I'm not
> certain what the purpose of that is. ?If it's to facilitate overriding
> the implementation in subclasses, then you need to change the names of
> the private methods to start with only one _ character so that they
> won't be mangled by the compiler.
>
> The comments before each method that only contain the name of the
> immediately following method are redundant.
>
> aggregate: the default aggregator is unintuitive to me. ?I would make
> it a required field and add a separate method called sum that calls
> aggregate with the operator.add aggregator.
> Also, the implementation doesn't look correct. ?Instead of passing in
> each item to the aggregator, you're passing in the number of items
> seen so far? ?The LINQ Aggregate method is basically reduce, so rather
> than reinvent the wheel I would suggest this:
>
> # MISSING is a unique object solely defined to represent missing arguments.
> # Unlike None we can safely assume it will never be passed as actual data.
> MISSING = object()
>
> def aggregate(self, aggregator, seed=MISSING):
> ? ? if seed is self.MISSING:
> ? ? ? ? return reduce(aggregator, self._iterable)
> ? ? else:
> ? ? ? ? return reduce(aggregator, self._iterable, seed)
>
> Note for compatibility that in Python 3 the reduce function has been
> demoted from a builtin to a member of the functools module.
>
> any: the name of this method could cause some confusion with the "any"
> builtin that does something a bit different.
>
> compare: the loop would more DRY as a for loop:
>
> def __compare(first, second, comparison):
> ? ? for firstval, secondval in itertools.izip_longest(first, second,
> fillvalue=self.MISSING):
> ? ? ? ? if firstval is self.MISSING:
> ? ? ? ? ? ? return -1
> ? ? ? ? elif secondval is self.MISSING:
> ? ? ? ? ? ? return 1
> ? ? ? ? else:
> ? ? ? ? ? ? result = comparison(firstval, secondval)
> ? ? ? ? ? ? if result != 0:
> ? ? ? ? ? ? ? ? return result
> ? ? return 0
>
> concatenate: again, no need to reinvent the wheel. ?This should be
> more efficient:
>
> def concatenate(self, other):
> ? ? return extend(itertools.chain(self.__iterable, other))
>
> equals: could be just "return self.compare(other, comparison) == 0"
>
> __last: the loop could be a for loop:
>
> ? ? ? ? # assume we're looking at the last item and try moving to the next
> ? ? ? ? item = result.Value
> ? ? ? ? for item in iterator: pass
> ? ? ? ? return item
>
> lastOrDefault: there's a lot of repeated logic here. ?This could just be:
>
> def lastOrDefault(self, default=None):
> ? ? try:
> ? ? ? ? return self.last()
> ? ? except ValueError:
> ? ? ? ? return default
>
> map / forEach: .NET has to separate these into separate methods due to
> static typing. ?It seems a bit silly to have both of them in Python.
> Also, map would be more efficient as "return itertools.imap(mapper,
> self.__iterable)"
>
> max / min: it would be more efficient to use the builtin:
> def max(self, key):
> ? ? return max(self.__iterable, key=key)
> If somebody really needs to pass a comparison function instead of a
> key function, they can use functools.cmp_to_key.
>
> randomSamples: a more canonical way to pass the RNG would be to pass
> an instance of random.Random rather than an arbitrary function. Then
> to get a random integer you can just call generator.randrange(total).
> Note that for the default you can just use the random module itself,
> which provides default implementations of all the Random methods.
> Also, for loops:
>
> ? ? def __randomSamples(iterable, sampleCount, generator):
> ? ? ? ? samples = []
> ? ? ? ? iterator = iter(iterable)
> ? ? ? ? # fill up the samples with the items from the beginning of the iterable
> ? ? ? ? for i, value in zip(xrange(sampleCount), iterator):
> ? ? ? ? ? ? samples.append(value)
> ? ? ? ? # replace items if the generated number is less than the total
> ? ? ? ? total = len(samples)
> ? ? ? ? for value in iterator:
> ? ? ? ? ? ? total += 1
> ? ? ? ? ? ? index = generator.randrange(total)
> ? ? ? ? ? ? if index < len(samples):
> ? ? ? ? ? ? ? ? samples[index] = result
> ? ? ? ? return samples
>
> __reverse: you could just "return reversed(list(iterable))"
>
> __rotateLeft:
> def __rotateLeft(iterable, shift):
> ? ? iterator = iter(iterable)
> ? ? front = list(itertools.islice(iterator, shift))
> ? ? return itertools.chain(iterator, front)
>
> skipWhile: suggest using itertools.dropwhile
> take: suggest using itertools.islice
> takeWhile: suggest using itertools.takewhile
> __toList: "return list(iterable)"
> __toSet: "return set(iterable)"
> __toTuple: "return tuple(iterable)". ?Note that as currently written
> this actually returns a generator, not a tuple.
> __where: suggest using itertools.ifilter
> __zip: suggest using a for loop over itertools.izip(first, second)
>
> Lookup: is inconsistent. ?The overridden __iter__ method returns an
> iterator over the values of the groups, but all the inherited methods
> are going to iterate over the keys. ?Probably you want to pass
> groups.values() to the superclass __init__ method.
>
> Cheers,
> Ian

Awesome tips. I appreciate the time you spent commenting on just about
every function. I really like your suggestions about using itertools
more, and for loops. I was feeling like some things were becoming way
too complicated.

I also noted the bugs you discovered. I will incorporate your
suggestions.

Thanks again!


From vinay_sajip at yahoo.co.uk  Fri Sep  2 18:59:31 2011
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 2 Sep 2011 15:59:31 -0700 (PDT)
Subject: Making `logging.basicConfig` log to *both* `sys.stderr` and
	`sys.stdout`?
References: <7f46ab8f-710c-4463-a072-fa80c49f90de@ea4g2000vbb.googlegroups.com>
Message-ID: <34939e5a-19ba-4cc5-b10b-36f8b2e42830@h9g2000vbr.googlegroups.com>

On Aug 30, 9:53?am, Michel Albert <exh... at gmail.com> wrote:


> Unfortunately this setup makes `logging.basicConfig` pretty useless.
> However, I believe that this is something that more people could
> benefit from. I also believe, that it just "makes sense" to send
> warnings (and above) to `stderr`, the rest to `stdout`.
>
> So I was thinking: "Why does `logging.basicConfig` not behave that
> way".

Because what seems entirely natural and obvious to you might not seem
so for someone else. The API in the stdlib tries to provide baseline
functionality which others can build on. For example, if you always
have a particular pattern which you use, you can always write a
utility function to set things up exactly how you like, and others who
want to set things up differently (for whatever reason) can do the
same thing, without having to come into conflict (if that's not too
strong a word) with views different from their own.

> Naturally, I was thinking of writing a patch against the python
> codebase and submit it as a suggestion. But before doing so, I would
> like to hear your thoughts on this. Does it make sense to you too or
> am I on the wrong track? Are there any downsides I am missing?

Python 2.x is closed to feature changes, and Python 2.7 and Python 3.2
already support flexible configuration using dictConfig() - see

http://docs.python.org/library/logging.config.html#logging.config.dictConfig

Also, Python 3.3 will support passing a list of handlers to
basicConfig(): see

http://plumberjack.blogspot.com/2011/04/added-functionality-for-basicconfig-in.html

which will allow you to do what you want quite easily.

Regards,

Vinay Sajip


From roy at panix.com  Fri Sep  2 19:16:29 2011
From: roy at panix.com (Roy Smith)
Date: Fri, 02 Sep 2011 19:16:29 -0400
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
Message-ID: <roy-030914.19162802092011@news.panix.com>

In article 
<5da6bf87-9412-46c4-ad32-f8337d56b2c3 at o15g2000vbe.googlegroups.com>,
 Adam Skutt <askutt at gmail.com> wrote:

> On Sep 2, 10:53?am, Roy Smith <r... at panix.com> wrote:
> > I have a function I want to run in a thread and return a value. ?It
> > seems like the most obvious way to do this is to have my target
> > function return the value, the Thread object stash that someplace, and
> > return it as the return value for join().
> > > Yes, I know there's other ways for a thread to return values (pass the
> > target a queue, for example), but making the return value of the
> > target function available would have been the most convenient. ?I'm
> > curious why threading wasn't implemented this way.
> 
> I assume it is because the underlying operating system APIs do not
> support it.  Windows and POSIX threads only support returning an
> integer when a thread exits, similar to the exit code of a process.

But the whole point of higher level languages is to hide the warts of 
the lower-level APIs they are built on top of.  Just because a POSIX 
thread can only return an int (actually, a void *) doesn't mean that 
level of detail needed to be exposed at the Python threading library 
level.

> More importantly, there's no way to tell whether the exit code of a
> thread was set by user code or by the system.  Even worse, some of
> those integer values are reserved by some operating systems.  If your
> thread died via an exception, it still has an error code set by the
> operating system.  How would you going to distinguish those codes from
> your own?

I think you're talking about processes, not threads, but in any case, 
it's a non-sequitur.  Thread.join() currently returns None, so there's 
no chance for confusion.


From greg.ewing at canterbury.ac.nz  Fri Sep  2 20:51:11 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 03 Sep 2011 12:51:11 +1200
Subject: Detecting Ctrl-Alt-Del in Windows
In-Reply-To: <mailman.697.1314951544.27778.python-list@python.org>
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>	<4E608064.9030005@ixokai.io>
	<mailman.697.1314951544.27778.python-list@python.org>
Message-ID: <9cdc00Fnq3U1@mid.individual.net>

Chris Angelico wrote:

> Although I heard somewhere that that's more gimmick than guarantee,
> and that it IS possible for an app to hook CAD - just that it's a lot
> harder than building a simple window that looks like the login...

And of course it's possible that someone has snuck in
during the night and installed Linux on the machine,
with a program that fakes a Windows login screen,
with Ctrl-Alt-Delete and everything...

-- 
Greg


From nospam at torek.net  Fri Sep  2 21:04:16 2011
From: nospam at torek.net (Chris Torek)
Date: 3 Sep 2011 01:04:16 GMT
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<roy-030914.19162802092011@news.panix.com>
Message-ID: <j3rueg0kkm@news4.newsguy.com>

In article <roy-030914.19162802092011 at news.panix.com>
Roy Smith  <roy at panix.com> wrote:
>Thread.join() currently returns None, so there's 
>no chance for [return value] confusion.

Well, still some actually.  If you use my example code (posted
elsethread), you need to know:

  - that there was a target function (my default return
    value if there is none is None); and
  - that the joined thread really did finish (if you pass
    a timeout value, rather than None, and the join times
    out, the return value is again None).

Of course, if your target function always exists and never returns
None, *then* there's no chance for confusion. :-)
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From jehugaleahsa at gmail.com  Fri Sep  2 21:39:21 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Fri, 2 Sep 2011 18:39:21 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
Message-ID: <18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>

On Sep 2, 6:49?pm, Travis Parks <jehugalea... at gmail.com> wrote:
> On Sep 2, 4:09?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Fri, Sep 2, 2011 at 10:59 AM, Travis Parks <jehugalea... at gmail.com> wrote:
> > > Hello:
>
> > > I am working on an algorithms library. It provides LINQ like
> > > functionality to Python iterators. Eventually, I plan on having
> > > feaures that work against sequences and mappings.
>
> > > I have the code up athttp://code.google.com/p/py-compass.
>
> > > This is my first project in Python, so I'd like some feedback. I want
> > > to know if I am following conventions (overall style and quality of
> > > code).
>
> > Sure, here are my comments.
>
> > In the "forever" and "__forever" functions, your use of the term
> > "generator" is confusing. ?"__forever" is a generator function,
> > because it has a yield statement. ?Its argument, called "generator",
> > appears to be a callable, not a generator or even necessarily a
> > generator function. ?Also, note that __forever(lambda: value) is
> > functionally equivalent to the more efficient itertools.repeat(value).
>
> > The staticmethod __next(iterator) accesses the class it is defined in,
> > which suggests that it might be better written as a classmethod
> > __next(cls, iterator).
>
> > Each of the LINQ-style methods is divided into two parts: the public
> > method that contains the docstring and some argument checks, and a
> > private staticmethod that contains the implementation. ?I'm not
> > certain what the purpose of that is. ?If it's to facilitate overriding
> > the implementation in subclasses, then you need to change the names of
> > the private methods to start with only one _ character so that they
> > won't be mangled by the compiler.
>
> > The comments before each method that only contain the name of the
> > immediately following method are redundant.
>
> > aggregate: the default aggregator is unintuitive to me. ?I would make
> > it a required field and add a separate method called sum that calls
> > aggregate with the operator.add aggregator.
> > Also, the implementation doesn't look correct. ?Instead of passing in
> > each item to the aggregator, you're passing in the number of items
> > seen so far? ?The LINQ Aggregate method is basically reduce, so rather
> > than reinvent the wheel I would suggest this:
>
> > # MISSING is a unique object solely defined to represent missing arguments.
> > # Unlike None we can safely assume it will never be passed as actual data.
> > MISSING = object()
>
> > def aggregate(self, aggregator, seed=MISSING):
> > ? ? if seed is self.MISSING:
> > ? ? ? ? return reduce(aggregator, self._iterable)
> > ? ? else:
> > ? ? ? ? return reduce(aggregator, self._iterable, seed)
>
> > Note for compatibility that in Python 3 the reduce function has been
> > demoted from a builtin to a member of the functools module.
>
> > any: the name of this method could cause some confusion with the "any"
> > builtin that does something a bit different.
>
> > compare: the loop would more DRY as a for loop:
>
> > def __compare(first, second, comparison):
> > ? ? for firstval, secondval in itertools.izip_longest(first, second,
> > fillvalue=self.MISSING):
> > ? ? ? ? if firstval is self.MISSING:
> > ? ? ? ? ? ? return -1
> > ? ? ? ? elif secondval is self.MISSING:
> > ? ? ? ? ? ? return 1
> > ? ? ? ? else:
> > ? ? ? ? ? ? result = comparison(firstval, secondval)
> > ? ? ? ? ? ? if result != 0:
> > ? ? ? ? ? ? ? ? return result
> > ? ? return 0
>
> > concatenate: again, no need to reinvent the wheel. ?This should be
> > more efficient:
>
> > def concatenate(self, other):
> > ? ? return extend(itertools.chain(self.__iterable, other))
>
> > equals: could be just "return self.compare(other, comparison) == 0"
>
> > __last: the loop could be a for loop:
>
> > ? ? ? ? # assume we're looking at the last item and try moving to the next
> > ? ? ? ? item = result.Value
> > ? ? ? ? for item in iterator: pass
> > ? ? ? ? return item
>
> > lastOrDefault: there's a lot of repeated logic here. ?This could just be:
>
> > def lastOrDefault(self, default=None):
> > ? ? try:
> > ? ? ? ? return self.last()
> > ? ? except ValueError:
> > ? ? ? ? return default
>
> > map / forEach: .NET has to separate these into separate methods due to
> > static typing. ?It seems a bit silly to have both of them in Python.
> > Also, map would be more efficient as "return itertools.imap(mapper,
> > self.__iterable)"
>
> > max / min: it would be more efficient to use the builtin:
> > def max(self, key):
> > ? ? return max(self.__iterable, key=key)
> > If somebody really needs to pass a comparison function instead of a
> > key function, they can use functools.cmp_to_key.
>
> > randomSamples: a more canonical way to pass the RNG would be to pass
> > an instance of random.Random rather than an arbitrary function. Then
> > to get a random integer you can just call generator.randrange(total).
> > Note that for the default you can just use the random module itself,
> > which provides default implementations of all the Random methods.
> > Also, for loops:
>
> > ? ? def __randomSamples(iterable, sampleCount, generator):
> > ? ? ? ? samples = []
> > ? ? ? ? iterator = iter(iterable)
> > ? ? ? ? # fill up the samples with the items from the beginning of the iterable
> > ? ? ? ? for i, value in zip(xrange(sampleCount), iterator):
> > ? ? ? ? ? ? samples.append(value)
> > ? ? ? ? # replace items if the generated number is less than the total
> > ? ? ? ? total = len(samples)
> > ? ? ? ? for value in iterator:
> > ? ? ? ? ? ? total += 1
> > ? ? ? ? ? ? index = generator.randrange(total)
> > ? ? ? ? ? ? if index < len(samples):
> > ? ? ? ? ? ? ? ? samples[index] = result
> > ? ? ? ? return samples
>
> > __reverse: you could just "return reversed(list(iterable))"
>
> > __rotateLeft:
> > def __rotateLeft(iterable, shift):
> > ? ? iterator = iter(iterable)
> > ? ? front = list(itertools.islice(iterator, shift))
> > ? ? return itertools.chain(iterator, front)
>
> > skipWhile: suggest using itertools.dropwhile
> > take: suggest using itertools.islice
> > takeWhile: suggest using itertools.takewhile
> > __toList: "return list(iterable)"
> > __toSet: "return set(iterable)"
> > __toTuple: "return tuple(iterable)". ?Note that as currently written
> > this actually returns a generator, not a tuple.
> > __where: suggest using itertools.ifilter
> > __zip: suggest using a for loop over itertools.izip(first, second)
>
> > Lookup: is inconsistent. ?The overridden __iter__ method returns an
> > iterator over the values of the groups, but all the inherited methods
> > are going to iterate over the keys. ?Probably you want to pass
> > groups.values() to the superclass __init__ method.
>
> > Cheers,
> > Ian
>
> Awesome tips. I appreciate the time you spent commenting on just about
> every function. I really like your suggestions about using itertools
> more, and for loops. I was feeling like some things were becoming way
>too complicated.
>
> I also noted the bugs you discovered. I will incorporate your
> suggestions.
>
> Thanks again!- Hide quoted text -
>
> - Show quoted text -

You commented that the itertools algorithms will perform faster than
the hand-written ones. Are these algorithms optimized internally?


From bkasterm at gmail.com  Fri Sep  2 22:15:11 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Fri, 02 Sep 2011 20:15:11 -0600
Subject: List comprehension timing difference.
References: <87zkinkcht.fsf@gmail.com>
	<mailman.676.1314925972.27778.python-list@python.org>
	<87sjofjbh1.fsf@gmail.com>
	<07906043-d732-43ca-8313-bee4746eca75@fi7g2000vbb.googlegroups.com>
Message-ID: <87bov29xsg.fsf@gmail.com>

ting at thsu.org writes:

> On Sep 2, 9:54?am, Bart Kastermans <bkast... at gmail.com> wrote:
>> if d(a,b) == 1 and a < b:
>
> It will probably be faster if you reverse the evaluation order of that
> expression.
>
> if a<b and d(a,b)==1:
>
> That way the d() function is called less than half the time. Of course
> this assumes that a<b is a faster evaluation than d(a,b), but I think
> that's true for your example.
> --
> // T.Hsu

Indeed makes quite a difference, goes from 275 seconds down to
153 seconds.


From clp2 at rebertia.com  Fri Sep  2 22:23:11 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 2 Sep 2011 19:23:11 -0700
Subject: Algorithms Library - Asking for Pointers
In-Reply-To: <18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
	<18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
Message-ID: <CAMZYqRT9UOqHDViLCXB0L0MVYjxVMN5wdaAOnQbin-VEPggP4w@mail.gmail.com>

On Fri, Sep 2, 2011 at 6:39 PM, Travis Parks <jehugaleahsa at gmail.com> wrote:
<snip>
> You commented that the itertools algorithms will perform faster than
> the hand-written ones. Are these algorithms optimized internally?

For one thing, they are written in C.

Cheers,
Chris


From lanyjie at yahoo.com  Sat Sep  3 00:18:21 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Fri, 2 Sep 2011 21:18:21 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>

Have you considered line continuation by indentation? It seems to meet the design principle. I think it is the most natural way to allow free line breaking in Python.

(Sorry, the yahoo web email interface is so weird that I don't know how to format comments between the quoted message below.)




>________________________________
>From: Stephen J. Turnbull <stephen at xemacs.org>
>To: Gabriel AHTUNE <gahtune at gmail.com>
>Cc: Matt Joiner <anacrolix at gmail.com>; "python-list at python.org" <python-list at python.org>; python-ideas <python-ideas at python.org>; Yingjie Lan <lanyjie at yahoo.com>
>Sent: Friday, September 2, 2011 3:28 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>Gabriel AHTUNE writes:
>> So can be done with this syntax:
>> 
>> > x = firstpart * secondpart? +? #line breaks here
>> > anotherpart + #continue
>> > stillanother #continue on.
>> 
>> after a "+" operator the line is clearly not finished yet.
>
>Sure, but IIRC one design principle of Python is that the keyword that
>denotes the syntax should be the first thing on the line, making it
>easy to scan down the left side of the code to see the syntactic
>structure.? The required indentation of the controlled suite also
>helps emphasize that keyword.
>
>Analogously, if operators are going to denote continuation, they
>should come first on the line.
>
>
>
>I just don't think this idea is going anywhere.? Explicit continuation
>with backslash or implicit continuation of parenthesized expressions
>is just not that heavy a price to pay.? Perhaps historically some of
>these ideas could have been implemented, but now they're just going to
>confuse a host of editors and code analysis tools.
>
>
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From nospam at torek.net  Sat Sep  3 00:35:05 2011
From: nospam at torek.net (Chris Torek)
Date: 3 Sep 2011 04:35:05 GMT
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
	<18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
Message-ID: <j3sapp01jeh@news1.newsguy.com>

In article <18fe4afd-569b-4580-a629-50f6c74829e8 at c29g2000yqd.googlegroups.com>
Travis Parks  <jehugaleahsa at gmail.com> wrote:
>[Someone] commented that the itertools algorithms will perform
>faster than the hand-written ones. Are these algorithms optimized
>internally?

They are written in C, so avoid a lot of CPython interpreter
overhead.  Mileage in Jython, etc., may vary...
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From stephen at xemacs.org  Sat Sep  3 00:38:15 2011
From: stephen at xemacs.org (Stephen J. Turnbull)
Date: Sat, 03 Sep 2011 13:38:15 +0900
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
Message-ID: <87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>

Guido van Rossum writes:
 > On Fri, Sep 2, 2011 at 12:28 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:

 > > Sure, but IIRC one design principle of Python is that the keyword that
 > > denotes the syntax should be the first thing on the line,
[...]
 > That's true for *statements* (except assignments and calls).
 > 
 > > Analogously, if operators are going to denote continuation, they
 > > should come first on the line.

 > That doesn't follow.

Agreed, it's not a logical implication.  The analogy is only an
analogy, but my eyes do work that way.

My conclusion is that we shouldn't try to encourage either style,
because people "see" continuation differently.  Legislating a style
isn't going to change that, I think.





From ian.g.kelly at gmail.com  Sat Sep  3 00:38:22 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 2 Sep 2011 22:38:22 -0600
Subject: sqlite3 with context manager
In-Reply-To: <j3r859$rnt$1@foggy.unx.sas.com>
References: <j3r859$rnt$1@foggy.unx.sas.com>
Message-ID: <CALwzidk8Yb_iqhgFoc+M4v_AeENY8jszyjWzpSQ96H4V6hzewg@mail.gmail.com>

On Fri, Sep 2, 2011 at 12:43 PM, Tim Arnold <Tim.Arnold at sas.com> wrote:
> Hi,
> I'm using the 'with' context manager for a sqlite3 connection:
>
> with sqlite3.connect(my.database,timeout=10) as conn:
> ? ? ? ? ? ?conn.execute('update config_build set datetime=?,result=?
> where id=?',
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(datetime.datetime.now(), success,
> self.b['id']))
>
> my question is what happens if the update fails? Shouldn't it throw an
> exception?

That depends on why it fails.  If you pass in an id that doesn't exist
in the database, it "successfully" updates 0 rows.  I would guess
that's what happened here.  You should check cursor.rowcount after
running the update query to make sure it actually did something.

Cheers,
Ian


From d_vineet at yahoo.com  Sat Sep  3 01:36:56 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Fri, 2 Sep 2011 22:36:56 -0700 (PDT)
Subject: json in python 2.5
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
Message-ID: <1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>

> e.g., I have this list:
> L = ['spam', 'ham', 'eggs', 12, (13.63)]
> What is the correct way to convert L to javascript array format?
> 1) jsonify the list and pass it to javascript
> (whether json format & javascript array are similar?)

JSON is in fact a subset of JavaScript, and modern browsers now
include a specific API for parsing and generating it
(https://developer.mozilla.org/En/Using_native_JSON ).
=============
@Chris, thanks for the pointer on parsing json.
=============
Python likewise has a JSON module in the std lib:
http://docs.python.org/library/json.html
========
I tried with json in std lib.
But it is included in python 2.6 onwards.
For my current proj, I need to use python 2.5.
Hence can't use json from the std lib.
Any idea on converting list to json in python 2.5?
=========

Thanks,
Vineet
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From clp2 at rebertia.com  Sat Sep  3 01:50:36 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 2 Sep 2011 22:50:36 -0700
Subject: json in python 2.5
In-Reply-To: <1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
	<1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
Message-ID: <CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>

On Fri, Sep 2, 2011 at 10:36 PM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
>> e.g., I have this list:
>> L = ['spam', 'ham', 'eggs', 12, (13.63)]
>> What is the correct way to convert L to javascript array format?
<snip>
> Python likewise has a JSON module in the std lib:
> http://docs.python.org/library/json.html
> ========
> I tried with json in std lib.
> But it is included in python 2.6 onwards.
> For my current proj, I need to use python 2.5.
> Hence can't use json from the std lib.
> Any idea on converting list to json in python 2.5?

http://pypi.python.org/pypi/simplejson/

Cheers,
Chris


From stephen at xemacs.org  Sat Sep  3 02:10:26 2011
From: stephen at xemacs.org (Stephen J. Turnbull)
Date: Sat, 03 Sep 2011 15:10:26 +0900
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
Message-ID: <87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>

Yingjie Lan writes:

 > Have you considered line continuation by indentation? It seems to
 > meet the design principle. I think it is the most natural way to
 > allow free line breaking in Python.

Briefly, yes, and I think it would need a lot of tuning and probably
complex rules.  Unlike statements, where everybody (except the judges
of the Obfuscated C Contest) agrees on a simple rule: "In a control
structure, the controlled suite should be uniformly indented one
level", line breaking and indentation of long expressions is an art,
and people have different opinions on "readability" and "beauty."
Achieving a compromise that is workable even for a few major styles is
likely to be annoying and bug-prone.

Pretty much every program I write seems to have a continued list of
data or a multi-line dictionary display as data.  It's not unusual for
me to comment the formal arguments in a function definition, or the
parent classes of a class definition.  The exception for parenthesized
objects is something I depend on for what I consider good style.  Of
course I could use explicit continuation, but in a long table that's
ugly and error-prone.

Long expressions that need to be broken across lines, on the other
hand, often indication that I haven't thought carefully enough about
that component of the program, and an extra pair of parentheses or a
terminal backslash just isn't that "heavy" or ugly in the context of
such long expressions.  For me, they're also pretty rare; many
programs I write have no explicit continuations in them at all.

YMMV, of course, but I find the compromise that Python arrived at to
be very useful, and I must suppose that it was substantially easier to
implement than "fully free" line breaking (whatever that means to you).


From pavlovevidence at gmail.com  Sat Sep  3 03:03:22 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 3 Sep 2011 00:03:22 -0700 (PDT)
Subject: sqlite3 with context manager
In-Reply-To: <j3r859$rnt$1@foggy.unx.sas.com>
References: <j3r859$rnt$1@foggy.unx.sas.com>
Message-ID: <7dbe35af-9cc7-42a8-9288-465e542b9ea6@glegroupsg2000goo.googlegroups.com>

On Friday, September 2, 2011 11:43:53 AM UTC-7, Tim Arnold wrote:
> Hi,
> I'm using the 'with' context manager for a sqlite3 connection:
> 
> with sqlite3.connect(my.database,timeout=10) as conn:
>              conn.execute('update config_build set datetime=?,result=?
> where id=?',
>                                (datetime.datetime.now(), success,
> self.b['id']))
> 
> my question is what happens if the update fails? Shouldn't it throw an
> exception?

If you look at the sqlite3 syntax documentation, you'll see it has a SQL extension that allows you to specify error semantics.  It looks something like this:

UPDATE OR IGNORE
UPDATE OR FAIL
UPDATE OR ROLLBACK

I'm not sure exactly how this interacts with pysqlite3, but using one of these might help it throw exceptions when you want it to.


Carl Banks


From nobody at nowhere.com  Sat Sep  3 03:49:49 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 03 Sep 2011 08:49:49 +0100
Subject: Detecting Ctrl-Alt-Del in Windows
References: <6e602a19-8cca-4924-bd95-df08615662d2@c8g2000prn.googlegroups.com>
	<4E608064.9030005@ixokai.io>
	<mailman.697.1314951544.27778.python-list@python.org>
Message-ID: <pan.2011.09.03.07.49.49.294000@nowhere.com>

On Fri, 02 Sep 2011 17:55:41 +1000, Chris Angelico wrote:

>> That's why you have to hit CAD to get to the login form in some versions
>> of Windows. The whole point of that secure sequence is that the OS and
>> only the OS responds.
> 
> Although I heard somewhere that that's more gimmick than guarantee,
> and that it IS possible for an app to hook CAD

It's possible to configure how CAD is handled, but this requires
Administrator privilege, so it's not exploitable (i.e. it doesn't gain you
anything you can't obtain by other means).



From lanyjie at yahoo.com  Sat Sep  3 03:51:11 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 00:51:11 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>

I agree that long lines of code are not very common in many projects, though it might be the case with some heavily involved in math. For some reason, when the feature of free line breaking came about in computer languages, it is welcomed and generally well accepted. Python uses indentation for blocks, and by the same mechanism, line breaking can be?accommodated without requiring parenthesis or ending backslashes.

For the tuning, yes, people would disagree on how to split expressions/code. The continue-by-indentation would allow people to break a line in whatever way that pleases their aesthetic taste, as long as there is an indentation. Most people seems to like an indentation on the continuing lines, probably for a visual indication of a continuation line. Some general guidelines may be provided, but there is no need for other hard rules on breaking lines, except that an identifier should never be split apart.

For the implementation, I don't have much clue. At least on the parser, it needs to look beyond the linefeed to determine if a line is completed. If the indentation is defined as a single symbol, then it would only require a one-step look-ahead, and that should not be hard.

Again, my?apology?for top posting.



>________________________________
>From: Stephen J. Turnbull <stephen at xemacs.org>
>To: Yingjie Lan <lanyjie at yahoo.com>
>Cc: Gabriel AHTUNE <gahtune at gmail.com>; Matt Joiner <anacrolix at gmail.com>; "python-list at python.org" <python-list at python.org>; python-ideas <python-ideas at python.org>
>Sent: Saturday, September 3, 2011 2:10 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>Yingjie Lan writes:
>
>> Have you considered line continuation by indentation? It seems to
>> meet the design principle. I think it is the most natural way to
>> allow free line breaking in Python.
>
>Briefly, yes, and I think it would need a lot of tuning and probably
>complex rules.? Unlike statements, where everybody (except the judges
>of the Obfuscated C Contest) agrees on a simple rule: "In a control
>structure, the controlled suite should be uniformly indented one
>level", line breaking and indentation of long expressions is an art,
>and people have different opinions on "readability" and "beauty."
>Achieving a compromise that is workable even for a few major styles is
>likely to be annoying and bug-prone.
>
>Pretty much every program I write seems to have a continued list of
>data or a multi-line dictionary display as data.? It's not unusual for
>me to comment the formal arguments in a function definition, or the
>parent classes of a class definition.? The exception for parenthesized
>objects is something I depend on for what I consider good style.? Of
>course I could use explicit continuation, but in a long table that's
>ugly and error-prone.
>
>Long expressions that need to be broken across lines, on the other
>hand, often indication that I haven't thought carefully enough about
>that component of the program, and an extra pair of parentheses or a
>terminal backslash just isn't that "heavy" or ugly in the context of
>such long expressions.? For me, they're also pretty rare; many
>programs I write have no explicit continuations in them at all.
>
>YMMV, of course, but I find the compromise that Python arrived at to
>be very useful, and I must suppose that it was substantially easier to
>implement than "fully free" line breaking (whatever that means to you).
>
>
>
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From kissgoodbye5204 at yahoo.com.cn  Sat Sep  3 04:28:12 2011
From: kissgoodbye5204 at yahoo.com.cn (www.brandtrade10.com)
Date: Sat, 3 Sep 2011 01:28:12 -0700 (PDT)
Subject: Nike Air Max LeBron VIII
Message-ID: <89bd2be6-2cea-4c1a-8491-769fca930562@w22g2000prj.googlegroups.com>

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From alain at dpt-info.u-strasbg.fr  Sat Sep  3 04:33:10 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sat, 03 Sep 2011 10:33:10 +0200
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
Message-ID: <878vq62fg9.fsf@dpt-info.u-strasbg.fr>

Adam Skutt <askutt at gmail.com> writes:

> On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
> wrote:
>> Sorry, you're wrong, at least for POSIX threads:
>>
>> void pthread_exit(void *value_ptr);
>> int pthread_join(pthread_t thread, void **value_ptr);
>>
>> pthread_exit can pass anything, and that value will be retrieved with
>> pthread_join.
>
> No, it can only pass a void*, which isn't much better than passing an
> int.

We'll have to disagree. A void* simply can point to anything you want.
Since thread stacks disappear at end of thread, only dynamically
allocated memory can be used to store the result. That's why you get a
pointer. There is no restriction on that pointer provided it doesn't
point to memory that has been deallocated.

> Passing a void* is not equivalent to passing anything, not even in C.
> Moreover, specific values are still reserved, like PTHREAD_CANCELLED.

Thread cancellation is program logic (pthread_cancel), it doesn't mean
you thread crashed, it means your program decided to cancel the thread.
If you still care about the return value after having called
pthread_cancel(), 

> Yes, it was strictly inappropriate for me to say both return solely
> integers, but my error doesn't meaningful alter my description of the
> situation. The interface provided by the underlying APIs is not
> especially usable for arbitrary data transfer.

Again, I may misunderstand your wording, but there is no "data transfer"
at all, since memory is shared between threads.

> Doubly so when we're discussing something like Python's threading
> module.

The OP was clearly discussing the case where a thread has a result, and
how to get it back. POSIX threads let you do that. There are of course
tons of other ways to do the same thing. Win32 will force you to use
some other way.

>> I'm not sure what you are talking about here. Maybe you confuse threads
>> with processes?
>
> Windows threads have exit codes, just like processes.  At least one
> code is reserved and cannot be used by the programmer.

Is that STILL_ACTIVE that we are talking about? That's an artefact of
the design of GetExitCodeThread, which will return either the thread
exit code or its own error code. The python lib could easily hide this,
and use run()'s return value to store the (python) result somewhere.

-- Alain.


From d_vineet at yahoo.com  Sat Sep  3 04:58:44 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Sat, 3 Sep 2011 01:58:44 -0700 (PDT)
Subject: json: python 2.5: error in browser
In-Reply-To: <CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
	<1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
	<CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>
Message-ID: <1315040324.53959.YahooMailNeo@web160509.mail.bf1.yahoo.com>

> Any idea on converting list to json in python 2.5?
http://pypi.python.org/pypi/simplejson/
Cheers,
Chris
=============
Now I built json from simplejson.
While trying to render the same in browser, nothing is displayed.
Opera Dragonfly shows this error:--
?
Uncaught exception: SyntaxError: JSON.parse: Unable to parse value: A,B,C
Error thrown at line 3, column 0 in http://127.0.0.1:8000/mywheels/test/cat:
??? var ctg = JSON.parse(["A", "B", "C"]);
~~~~~~~~~~~~~~~~
I validated this json --? ["A", "B", "C"]?? in jsonlint.com
It is valid json.
?
Why the?method "JSON.parse" is unable to parse JSON?
?
--Vineet
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From alain at dpt-info.u-strasbg.fr  Sat Sep  3 05:00:22 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sat, 03 Sep 2011 11:00:22 +0200
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
	<878vq62fg9.fsf@dpt-info.u-strasbg.fr>
Message-ID: <874o0u2e6x.fsf@dpt-info.u-strasbg.fr>

Alain Ketterlin <alain at dpt-info.u-strasbg.fr> writes:

>> Passing a void* is not equivalent to passing anything, not even in C.
>> Moreover, specific values are still reserved, like PTHREAD_CANCELLED.
>
> Thread cancellation is program logic (pthread_cancel), it doesn't mean
> you thread crashed, it means your program decided to cancel the thread.
> If you still care about the return value after having called
> pthread_cancel(), 

Sotry, forgot to end this sentence... What I mean is:

If you still care about the return value after having called
pthread_cancel(), your program logic is unnecessarily complex, and
you should find some other way to handle this case.

-- Alain.


From clp2 at rebertia.com  Sat Sep  3 05:21:44 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 3 Sep 2011 02:21:44 -0700
Subject: json: python 2.5: error in browser
In-Reply-To: <1315040324.53959.YahooMailNeo@web160509.mail.bf1.yahoo.com>
References: <1314977665.30984.YahooMailNeo@web160510.mail.bf1.yahoo.com>
	<CAMZYqRTGnSVecpB0+2fegCtCkRt+Uiz_TeSH1vwfouEW0fLr5w@mail.gmail.com>
	<1315028216.36570.YahooMailNeo@web160520.mail.bf1.yahoo.com>
	<CAMZYqRQw_cTHXJFgTNfafJXeVZu4OyoU6H13PBWP30QWPwrfNg@mail.gmail.com>
	<1315040324.53959.YahooMailNeo@web160509.mail.bf1.yahoo.com>
Message-ID: <CAMZYqRQSyoa32+LDYdaifNCgRYYFq4iaLVZS-WOxQEh0uBPogw@mail.gmail.com>

On Sat, Sep 3, 2011 at 1:58 AM, Vineet Deodhar <d_vineet at yahoo.com> wrote:
> Opera Dragonfly shows this error:--
>
> Uncaught exception: SyntaxError: JSON.parse: Unable to parse value: A,B,C
> Error thrown at line 3, column 0 in http://127.0.0.1:8000/mywheels/test/cat:
> ??? var ctg = JSON.parse(["A", "B", "C"]);
> ~~~~~~~~~~~~~~~~
> I validated this json --? ["A", "B", "C"]?? in jsonlint.com
> It is valid json.
>
> Why the?method "JSON.parse" is unable to parse JSON?

It takes a *string* containing JSON. You want:
var ctg = JSON.parse('["A", "B", "C"]');// note outer quotes!

Think about it: If you already had ["A", "B", "C"] in the first place,
then you could just do:
var ctg = ["A", "B", "C"];
And JSON would never enter into the discussion.

Your issue is akin to confusing the following two outputs:
Python 2.6.6 (r266:84292, Jan 12 2011, 13:35:00)
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 'foo' # expression resulting in the string
'foo'
>>> print 'foo' # contents of the string
foo

Regards,
Chris


From lanyjie at yahoo.com  Sat Sep  3 06:33:48 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 03:33:48 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>

Ambiguity: yes, when the last line of a suite is a continued line, it would require double dedentations to end the line and the suite. I noticed a similar case in current Python language as well:

==================================
#BEGIN CODE 1
if condition:
for i in range(5):
triangulate(i)
else: #double dedentations
for body in space:
triangulate(body)
#double dedentations again
log('triangulation done')
#END CODE 1
==================================



If lines can be continued by indentation, similar situation would rise:

==================================
#BEGIN CODE 2
if condition:
result = [sin(i) for i in range(5)]
+ [cos(i) for i in range(5)]
else:

result = [cos(i) for i in range(5)]
+ [sin(i) for i in range(5)]

log('triangulation done')
#END CODE 2
==================================


Generating text example: right, this is a case that can't be handled by standard indentation, unless we only consider full dedentation (dedentation to the exact level of the initial indentation) as the signal of ending the line. Whether to?accommodate?for such a case might be an issue of debate, but at least we can have such 'freedom' :)




>________________________________
>From: Stephen J. Turnbull <stephen at xemacs.org>
>To: Yingjie Lan <lanyjie at yahoo.com>
>Cc: Gabriel AHTUNE <gahtune at gmail.com>; Matt Joiner <anacrolix at gmail.com>; python-ideas <python-ideas at python.org>
>Sent: Saturday, September 3, 2011 5:29 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>Yingjie Lan writes:
>
>> Python uses indentation for blocks, and by the same mechanism, line
>> breaking can be?accommodated without requiring parenthesis or
>> ending backslashes.
>
>Possibly, but now you have a problem that a dedent has ambiguous
>meaning.? It might mean that you're ending a suite, or it might mean
>you're ending a continued expression.? This probably can be
>disambiguated, but I don't know how easy that will be to do perfectly,
>including in reporting ill-formed programs.
>
>> Most people seems to like an indentation on the continuing lines,
>
>Most of the time, yes, but sometimes not.? For example, in generating
>text, it's often useful to dedent substantially so you can have a
>nearly normal length line in the literal strings being concatenated.
>Or you might have a pattern like this:
>
>? ? x = long_named_variable_a
>? ? ? ? ? ? - long_named_variable_a_base
>? ? ? ? + long_named_variable_b
>? ? ? ? ? ? - long_named_variable_b_base
>
>which your parser would raise an error on, I presume.? That's not
>freedom!<wink />
>
>
>
>
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From lanyjie at yahoo.com  Sat Sep  3 06:50:30 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 03:50:30 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
Message-ID: <1315047030.94472.YahooMailNeo@web121507.mail.ne1.yahoo.com>

Oops, the generating text part of my reply is referring to your last code example. For literal texts, it is is not governed by this proposal, nor are expressions within brackets and backslash continued lines. In a word, this proposal is fully backward compatible.



>________________________________
>From: Yingjie Lan <lanyjie at yahoo.com>
>To: Stephen J. Turnbull <stephen at xemacs.org>
>Cc: python list <python-list at python.org>; Gabriel AHTUNE <gahtune at gmail.com>; python-ideas <python-ideas at python.org>; Matt Joiner <anacrolix at gmail.com>
>Sent: Saturday, September 3, 2011 6:33 PM
>Subject: Re: [Python-ideas] allow line break at operators
>
>
>Ambiguity: yes, when the last line of a suite is a continued line, it would require double dedentations to end the line and the suite. I noticed a similar case in current Python language as well:
>
>
>==================================
>#BEGIN CODE 1
>if condition:
>for i in range(5):
>triangulate(i)
>else: #double dedentations
>for body in space:
>triangulate(body)
>#double dedentations again
>log('triangulation done')
>#END CODE 1
>==================================
>
>
>
>If lines can be continued by indentation, similar situation would rise:
>
>
>==================================
>#BEGIN CODE 2
>if condition:
>result = [sin(i) for i in range(5)]
>+ [cos(i) for i in range(5)]
>else:
>
>result = [cos(i) for i in range(5)]
>+ [sin(i) for i in range(5)]
>
>
>log('triangulation done')
>#END CODE 2
>==================================
>
>
>
>Generating text example: right, this is a case that can't be handled by standard indentation, unless we only consider full dedentation (dedentation to the exact level of the initial indentation) as the signal of ending the line. Whether to?accommodate?for such a case might be an issue of debate, but at least we can have such 'freedom' :)
>
>
>
>
>
>>________________________________
>>From: Stephen J. Turnbull <stephen at xemacs.org>
>>To: Yingjie Lan <lanyjie at yahoo.com>
>>Cc: Gabriel AHTUNE <gahtune at gmail.com>; Matt Joiner <anacrolix at gmail.com>; python-ideas <python-ideas at python.org>
>>Sent: Saturday, September 3, 2011 5:29 PM
>>Subject: Re: [Python-ideas] allow line break at operators
>>
>>Yingjie Lan writes:
>>
>>> Python uses indentation for blocks, and by the same mechanism, line
>>> breaking can be?accommodated without requiring parenthesis or
>>> ending backslashes.
>>
>>Possibly, but now you have a problem that a dedent has ambiguous
>>meaning.? It might mean that you're ending a suite, or it might mean
>>you're ending a continued expression.? This probably can be
>>disambiguated, but I don't know how easy that will be to do
 perfectly,
>>including in reporting ill-formed programs.
>>
>>> Most people seems to like an indentation on the continuing lines,
>>
>>Most of the time, yes, but sometimes not.? For example, in generating
>>text, it's often useful to dedent substantially so you can have a
>>nearly normal length line in the literal strings being concatenated.
>>Or you might have a pattern like this:
>>
>>? ? x = long_named_variable_a
>>? ? ? ? ? ? - long_named_variable_a_base
>>? ? ? ? + long_named_variable_b
>>? ? ? ? ? ? - long_named_variable_b_base
>>
>>which your parser would raise an error on, I presume.? That's not
>>freedom!<wink />
>>
>>
>>
>>
>-- 
>http://mail.python.org/mailman/listinfo/python-list
>
>
>
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From pavlovevidence at gmail.com  Sat Sep  3 08:04:42 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 3 Sep 2011 05:04:42 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
In-Reply-To: <5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
Message-ID: <6a30f0e6-cd0b-4ae2-9a0a-067411bc184f@glegroupsg2000goo.googlegroups.com>

On Friday, September 2, 2011 11:01:17 AM UTC-7, Adam Skutt wrote:
> On Sep 2, 10:53?am, Roy Smith <r.... at panix.com> wrote:
> > I have a function I want to run in a thread and return a value. ?It
> > seems like the most obvious way to do this is to have my target
> > function return the value, the Thread object stash that someplace, and
> > return it as the return value for join().
> > > Yes, I know there's other ways for a thread to return values (pass the
> > target a queue, for example), but making the return value of the
> > target function available would have been the most convenient. ?I'm
> > curious why threading wasn't implemented this way.
> 
> I assume it is because the underlying operating system APIs do not
> support it.

Nope.  This could easily be implemented by storing the return value in the Thread object.

It's not done that way probably because no one thought of doing it.


Carl Bannks


From pavlovevidence at gmail.com  Sat Sep  3 08:27:51 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 3 Sep 2011 05:27:51 -0700 (PDT)
Subject: Why doesn't threading.join() return a value?
In-Reply-To: <bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
Message-ID: <7ea98c63-e045-45f2-9602-0c3b4495d141@glegroupsg2000goo.googlegroups.com>

On Friday, September 2, 2011 11:53:43 AM UTC-7, Adam Skutt wrote:
> On Sep 2, 2:23?pm, Alain Ketterlin <al... at dpt-info.u-strasbg.fr>
> wrote:
> > Sorry, you're wrong, at least for POSIX threads:
> >
> > void pthread_exit(void *value_ptr);
> > int pthread_join(pthread_t thread, void **value_ptr);
> >
> > pthread_exit can pass anything, and that value will be retrieved with
> > pthread_join.
> 
> No, it can only pass a void*, which isn't much better than passing an
> int.  Passing a void* is not equivalent to passing anything, not even
> in C.  Moreover, specific values are still reserved, like
> PTHREAD_CANCELLED. Yes, it was strictly inappropriate for me to say
> both return solely integers, but my error doesn't meaningful alter my
> description of the situation.  The interface provided by the
> underlying APIs is not especially usable for arbitrary data transfer.

I'm sorry, but your claim is flat out wrong.  It's very common in C programming to use a void* to give a programmer ability to pass arbitrary data through some third-party code.

The Python API itself uses void* in this way in several different places.  For instance, ake a look at the Capsule API (http://docs.python.org/c-api/capsule.html).  You'll notice it uses a void* to let a user pass in opaque data.  Another case is when declaring properties in C: it's common to define a single get or set function, and only vary some piece of data for the different properties.  The API provides a void* so that the extension writer can pass arbitrary data to the get and set functions.


Carl Banks


From benjamin at schollnick.net  Sat Sep  3 10:11:17 2011
From: benjamin at schollnick.net (Benjamin Schollnick)
Date: Sat, 3 Sep 2011 10:11:17 -0400
Subject: Need advice on Web / Database framework...
Message-ID: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>

Folks,

I need some advice on a python web & database framework to use...?

I have handcrafted a sqllite3 python script, that is a basic web application, interfacing with a sqlite3 database...

But I am concerned at the thought of handcrafting a administration interface, and so forth.

Are there any recommendations on a python toolkit / framework that could help deal with the realities of this?
The main issue is hand crafting all the forms and html web pages...  

I have done a little cheetah templating...  So that might be a partial solution, but I'm concerned with someone trying to craft a malicious payload in the fields, and so forth...  

I have thought about an out of the box solution, for example, using a wordpress install for the front-end, but I haven't been able to think of a good way to bridge this gap.

Would Zope be a good solution possibly?  Any suggestions would be appreciated...

		- Ben

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From mukeshtiwari.iiitm at gmail.com  Sat Sep  3 10:40:03 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Sat, 3 Sep 2011 07:40:03 -0700 (PDT)
Subject: Reading pen drive data
Message-ID: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>

Hello all
I am trying to write a python script which can mount a pen drive and
read the data from pen drive. I am using pyudev [
http://packages.python.org/pyudev/api/index.html ] and wrote a small
python code

import pyudev, sys
if __name__ =="__main__":
        context = pyudev.Context()
        devices = context.list_devices(subsystem        ="usb")
        for device in devices :
                print device

which prints

Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')

My problem is,  how to know  out of these usb which one to read . The
other solution I got is whenever I insert the pen drive , my system
mounts  it in /media  directory so I can read the /media directory  to
check if its empty or not but this does not seems promising to me
because it may be possible that my system is not able to mount the pen
drive so I have to manually do it .  Kindly some one please tell me
how to solve this problem.


From noreply at domain.invalid  Sat Sep  3 12:15:12 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 12:15:12 -0400
Subject: Functions vs OOP
Message-ID: <j3tjov$c30$1@dont-email.me>

During some recent research, and re-familiarization with Python, I came 
across documentation that suggests that programming using functions, and 
programming using objects were somehow opposing techniques.

It seems to me that they are complimentary.  It makes sense to create 
objects and have some functions that take those objects as arguments. 
Are they suggesting that any function that takes an object as an 
argument should always be a method of that object?  Conversely I can see 
creating functions that take raw input (e.g. strings) and return it in a 
format compatible with an object's constructor, rather than have objects 
accept any conceivable format for its constructor.

Am I missing something, or am I taking things too literally?


From mukeshtiwari.iiitm at gmail.com  Sat Sep  3 12:21:57 2011
From: mukeshtiwari.iiitm at gmail.com (mukesh tiwari)
Date: Sat, 3 Sep 2011 09:21:57 -0700 (PDT)
Subject: Reading pen drive data
References: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>
Message-ID: <4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>

On Sep 3, 7:40?pm, mukesh tiwari <mukeshtiwari.ii... at gmail.com> wrote:
> Hello all
> I am trying to write a python script which can mount a pen drive and
> read the data from pen drive. I am using pyudev [http://packages.python.org/pyudev/api/index.html] and wrote a small
> python code
>
> import pyudev, sys
> if __name__ =="__main__":
> ? ? ? ? context = pyudev.Context()
> ? ? ? ? devices = context.list_devices(subsystem ? ? ? ?="usb")
> ? ? ? ? for device in devices :
> ? ? ? ? ? ? ? ? print device
>
> which prints
>
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')
>
> My problem is, ?how to know ?out of these usb which one to read . The
> other solution I got is whenever I insert the pen drive , my system
> mounts ?it in /media ?directory so I can read the /media directory ?to
> check if its empty or not but this does not seems promising to me
> because it may be possible that my system is not able to mount the pen
> drive so I have to manually do it . ?Kindly some one please tell me
> how to solve this problem.

I got this link and its working fine [ http://packages.python.org/pyudev/api/monitor.html
]
>>> context = pyudev.Context()
>>> monitor = pyudev.Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> for action, device in monitor:
...     print('{0}: {1}'.format(action, device))

but when I am trying to execute code [ http://packages.python.org/pyudev/api/toolkit.html
]

import pyudev, sys

context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem='usb')
observer = QUDevMonitorObserver(monitor)
def device_connected(device):
     print('{0!r} added'.format(device))
observer.deviceAdded.connect(device_connected)
monitor.start()

I am getting
Traceback (most recent call last):
  File "Mount.py", line 7, in <module>
    observer = QUDevMonitorObserver(monitor)
NameError: name 'QUDevMonitorObserver' is not defined

Could any one please tell me how to avoid this error .
Thank you


From steve+comp.lang.python at pearwood.info  Sat Sep  3 12:25:43 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 04 Sep 2011 02:25:43 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>

William Gill wrote:

> During some recent research, and re-familiarization with Python, I came
> across documentation that suggests that programming using functions, and
> programming using objects were somehow opposing techniques.
> 
> It seems to me that they are complimentary.  It makes sense to create
> objects and have some functions that take those objects as arguments.

Python is a mixed paradigm language, with object, functional and imperative
paradigms.


> Are they suggesting that any function that takes an object as an
> argument should always be a method of that object?

Yes.

http://steve-yegge.blogspot.com/2006/03/execution-in-kingdom-of-nouns.html

[...]
> Am I missing something, or am I taking things too literally?

No, it is the OO purists who are missing something.



-- 
Steven



From python at mrabarnett.plus.com  Sat Sep  3 12:29:11 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 03 Sep 2011 17:29:11 +0100
Subject: Functions vs OOP
In-Reply-To: <j3tjov$c30$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <4E6255D7.2070005@mrabarnett.plus.com>

On 03/09/2011 17:15, William Gill wrote:
> During some recent research, and re-familiarization with Python, I
> came across documentation that suggests that programming using
> functions, and programming using objects were somehow opposing
> techniques.
>
> It seems to me that they are complimentary.

I think you mean "complementary". :-)

> It makes sense to create objects and have some functions that take
> those objects as arguments. Are they suggesting that any function
> that takes an object as an argument should always be a method of that
> object? Conversely I can see creating functions that take raw input
> (e.g. strings) and return it in a format compatible with an object's
> constructor, rather than have objects accept any conceivable format
> for its constructor.
>
> Am I missing something, or am I taking things too literally?

I think that it's all about "state".

In functional programming, there's no state; a function's result
depends solely on its arguments, so it will always return the same
result for the same given arguments.

In OOP, on the other hand, an object often has a state; a method may
return a different result each time it's called, even for the same
given arguments.


From me+list/python at ixokai.io  Sat Sep  3 12:50:25 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Sat, 03 Sep 2011 09:50:25 -0700
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
Message-ID: <4E625AD1.6060103@ixokai.io>

On 9/3/11 3:33 AM, Yingjie Lan wrote:
> but at least we can have such 'freedom' :)

Freedom is not and never has been, IMHO, a virtue or goal or even desire
in Python. Where it occurs, it is at best a happy coincidence, and even
if that happy coincidence happens often, it is not a design feature, IMHO.

Simplicity and readability are virtues in Python. Freedom is even
declared a vice to be avoided by the Zen, that holy document which
defines all things Pythonic in clear and unambiguously absolute terms*.

Looking over this whole thread at the various examples -- they add
complication (a vice!). Complication to the parser, complication to the
language itself and worse, understanding of code (as your head has to
parse things too), all for what?

So you don't have to use parens, which quite explicitly (another
virtue!) do the job, to wrap around a long expression? Escaping newlines
is arguably a bit on the ugly side (a vice!), so maybe the proposal has
a little weight there, but since you can just avoid that by using
parens, that's pretty much nullified. (Since it is also a virtue to
offer only the Dutch way of doing things -- at least without hiding the
alternatives in modules with a little bit of shame -- and this is
clearly a case of the Dutch liking limited use of grouping parens).

There just isn't even vaguely enough justification based on
Python-virtues (readability, simplicity, explicitness, things like that)
to even kind of make it worth the complication.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

* Obvious exaggeration :P

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From roy at panix.com  Sat Sep  3 12:51:03 2011
From: roy at panix.com (Roy Smith)
Date: Sat, 03 Sep 2011 12:51:03 -0400
Subject: Why doesn't threading.join() return a value?
References: <61044fa5-2850-4f05-a55a-d61521c74313@d7g2000vbv.googlegroups.com>
	<5da6bf87-9412-46c4-ad32-f8337d56b2c3@o15g2000vbe.googlegroups.com>
	<87hb4u3isf.fsf@dpt-info.u-strasbg.fr>
	<bf50c8e1-1476-41e1-b2bc-61e329bfa5be@s12g2000yqm.googlegroups.com>
	<j3rdg00fmp@news6.newsguy.com>
Message-ID: <roy-A4ECCE.12510303092011@news.panix.com>

In article <j3rdg00fmp at news6.newsguy.com>,
 Chris Torek <nospam at torek.net> wrote:

> For that matter, you can use the following to get what the OP asked
> for.  (Change all the instance variables to __-prefixed versions
> if you want them to be Mostly Private.)
> 
> import threading
> 
> class ValThread(threading.Thread):
>     "like threading.Thread, but the target function's return val is captured"
>     def __init__(self, group=None, target=None, name=None,
>             args=(), kwargs=None, verbose=None):
>         super(ValThread, self).__init__(group, None, name, None, None, 
>         verbose)
>         self.value = None
>         self.target = target
>         self.args = args
>         self.kwargs = {} if kwargs is None else kwargs
> 
>     def run(self):
>         "run the thread"
>         if self.target:
>             self.value = self.target(*self.args, **self.kwargs)
> 
>     def join(self, timeout = None):
>         "join, then return value set by target function"
>         super(ValThread, self).join(timeout)
>         return self.value

Yeah, that's pretty much what I had in mind.  I'm inclined to write up a 
PEP proposing that this become the standard behavior of 
threading.Thread.  It seems useful, and I can't see any way it would 
break any existing code.


From roy at panix.com  Sat Sep  3 12:59:59 2011
From: roy at panix.com (Roy Smith)
Date: Sat, 03 Sep 2011 12:59:59 -0400
Subject: [Python-ideas] allow line break at operators
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<mailman.688.1314941609.27778.python-list@python.org>
Message-ID: <roy-8F9B92.12595803092011@news.panix.com>

In article <mailman.688.1314941609.27778.python-list at python.org>,
 Matt Joiner <anacrolix at gmail.com> wrote:

> I guess the issue here is that you can't tell if an expression is
> complete without checking the indent of the following line. This is
> likely not desirable.

I wrote a weird bug the other day.  I had a function that returned a 
4-tuple and wanted to unpack it, so I wrote:

    var1,
    var2,
    var3,
    var4 = my_function()

which isn't a syntax error, but also isn't what I meant.  Depending on 
whether var[123] have pre-existing values, this doesn't even produce a 
run-time error.  Emacs encouraged me in this crime by merrily 
auto-indenting the code the way I expected :-)


From malaclypse2 at gmail.com  Sat Sep  3 13:08:26 2011
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Sat, 3 Sep 2011 13:08:26 -0400
Subject: Reading pen drive data
In-Reply-To: <4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
References: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>
	<4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
Message-ID: <CADwdpyYuu8cXSokzh_U_W20zmZF5fiWb1fv-eT7Q3nFN=4mdvg@mail.gmail.com>

On Sat, Sep 3, 2011 at 12:21 PM, mukesh tiwari <mukeshtiwari.iiitm at gmail.com
> wrote:

> I am getting
> Traceback (most recent call last):
>  File "Mount.py", line 7, in <module>
>    observer = QUDevMonitorObserver(monitor)
> NameError: name 'QUDevMonitorObserver' is not defined
>
> Could any one please tell me how to avoid this error .
>

It looks to me like that should be pyudev.QUDevMonitorObserver, shouldn't
it?

-- 
Jerry
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From python at mrabarnett.plus.com  Sat Sep  3 13:16:01 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 03 Sep 2011 18:16:01 +0100
Subject: Reading pen drive data
In-Reply-To: <4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
References: <3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>
	<4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
Message-ID: <4E6260D1.4010905@mrabarnett.plus.com>

On 03/09/2011 17:21, mukesh tiwari wrote:
> On Sep 3, 7:40 pm, mukesh tiwari<mukeshtiwari.ii... at gmail.com>  wrote:
>> Hello all
>> I am trying to write a python script which can mount a pen drive and
>> read the data from pen drive. I am using pyudev [http://packages.python.org/pyudev/api/index.html] and wrote a small
>> python code
>>
>> import pyudev, sys
>> if __name__ =="__main__":
>>          context = pyudev.Context()
>>          devices = context.list_devices(subsystem        ="usb")
>>          for device in devices :
>>                  print device
>>
>> which prints
>>
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')
>>
>> My problem is,  how to know  out of these usb which one to read . The
>> other solution I got is whenever I insert the pen drive , my system
>> mounts  it in /media  directory so I can read the /media directory  to
>> check if its empty or not but this does not seems promising to me
>> because it may be possible that my system is not able to mount the pen
>> drive so I have to manually do it .  Kindly some one please tell me
>> how to solve this problem.
>
> I got this link and its working fine [ http://packages.python.org/pyudev/api/monitor.html
> ]
>>>> context = pyudev.Context()
>>>> monitor = pyudev.Monitor.from_netlink(context)
>>>> monitor.filter_by(subsystem='input')
>>>> for action, device in monitor:
> ...     print('{0}: {1}'.format(action, device))
>
> but when I am trying to execute code [ http://packages.python.org/pyudev/api/toolkit.html
> ]
>
> import pyudev, sys
>
> context = pyudev.Context()
> monitor = pyudev.Monitor.from_netlink(context)
> monitor.filter_by(subsystem='usb')
> observer = QUDevMonitorObserver(monitor)
> def device_connected(device):
>       print('{0!r} added'.format(device))
> observer.deviceAdded.connect(device_connected)
> monitor.start()
>
> I am getting
> Traceback (most recent call last):
>    File "Mount.py", line 7, in<module>
>      observer = QUDevMonitorObserver(monitor)
> NameError: name 'QUDevMonitorObserver' is not defined
>
> Could any one please tell me how to avoid this error .
> Thank you

I think you need to import it from pyudev.pyqt4.


From d_vineet at yahoo.com  Sat Sep  3 13:23:17 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Sat, 3 Sep 2011 10:23:17 -0700 (PDT)
Subject: framework suggestions for Ben
Message-ID: <1315070597.66606.YahooMailNeo@web160520.mail.bf1.yahoo.com>

>Folks,
>I need some advice on a python web & database framework to use...?
>I have handcrafted a sqllite3 python script, that is a basic web application, interfacing with a >sqlite3 database...

It depends on whether you want to develop?desktop apps or browser-based apps.
I will suggest 2 frameworks with their urls.
I will not enumerate the features?here,?because their?websites?contain loads of advocacy about them.
?
=========
For desktop apps, my STRONG advise to you is DABO.
http://dabodev.com/
It is developed by the experts in data-centric business apps.
It contains the features which I haven't seen in any other framework except MS VFP & cursor adapter?(if at all you are familiar with them).
========
For browser based apps, I found web2py very simple yet powerful.
http://web2py.com/
?
It requires no installation (not even python).
Everything works out of the box.
No dependencies.
=========
?
Hope this helps.
:)
Vineet
......
>- Ben
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From mithrandi at mithrandi.net  Sat Sep  3 13:26:22 2011
From: mithrandi at mithrandi.net (Tristan Seligmann)
Date: Sat, 3 Sep 2011 19:26:22 +0200
Subject: [ANN] Pyflakes 0.5.0
Message-ID: <CAMcKhMQy_fnb13Co0s6y+LKgsizeMJTUFqGaPQocaUT0N=VgGQ@mail.gmail.com>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

It is my unexpected pleasure to announce the release of Pyflakes
0.5.0, the first release in several years, and available now from
PyPI[1].

Highlights of this release include the use of the built-in AST instead
of the compiler module, and support for various new syntax constructs
in Python 2.7. Note that development of Pyflakes (as well as the other
divmod.org projects) has moved to Launchpad[2] since the last release.

[1] http://pypi.python.org/packages/source/p/pyflakes/pyflakes-0.5.0.tar.gz#md5=568dab27c42e5822787aa8a603898672

[2] https://launchpad.net/pyflakes
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-----END PGP SIGNATURE-----


From milleja46 at gmail.com  Sat Sep  3 13:54:15 2011
From: milleja46 at gmail.com (Joshua Miller)
Date: Sat, 3 Sep 2011 13:54:15 -0400
Subject: IDLE from python 3.2 constantly crashes
Message-ID: <CAKoEMEfVjUuCBEOfCvQUSh4kZ=KMMYqQBvsfZqNKg1cOgJgQ0A@mail.gmail.com>

Ok i've been using IDLE on my home computer and everytime i try and
open a file that i saved to my hdd instead of my flashdrive(because
it's a school project) by accident, it opens for a second and i try to
do something else like open another file and it crashes. Is there
anyway to remedy this error?

By the way i'm running python 3.2 on windows 7 if it makes a difference


From nagle at animats.com  Sat Sep  3 14:10:06 2011
From: nagle at animats.com (John Nagle)
Date: Sat, 03 Sep 2011 11:10:06 -0700
Subject: SSL module needs issuer information
Message-ID: <4e626d97$0$1665$742ec2ed@news.sonic.net>

   The SSL module still doesn't return much information from the
certificate.  SSLSocket.getpeercert only returns a few basic items
about the certificate subject.  You can't retrieve issuer information,
and you can't get the extensions needed to check if a cert is an EV cert.

   With the latest flaps about phony cert issuers, it's worth
having issuer info available.  It was available in the old M2Crypto
module, but not in the current Python SSL module.

				John Nagle


From ian.g.kelly at gmail.com  Sat Sep  3 14:50:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 3 Sep 2011 12:50:14 -0600
Subject: Functions vs OOP
In-Reply-To: <j3tjov$c30$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <CALwzid=kbZYux0k3vs7y6zr9FRu2GBDJ=1-cm8=4BgYNcYpRUQ@mail.gmail.com>

On Sat, Sep 3, 2011 at 10:15 AM, William Gill <noreply at domain.invalid> wrote:
> During some recent research, and re-familiarization with Python, I came
> across documentation that suggests that programming using functions, and
> programming using objects were somehow opposing techniques.
>
> It seems to me that they are complimentary. ?It makes sense to create
> objects and have some functions that take those objects as arguments. Are
> they suggesting that any function that takes an object as an argument should
> always be a method of that object? ?Conversely I can see creating functions
> that take raw input (e.g. strings) and return it in a format compatible with
> an object's constructor, rather than have objects accept any conceivable
> format for its constructor.
>
> Am I missing something, or am I taking things too literally?

I think you may be confusing "functional programming" and "programming
using functions".  These are not the same thing.

Functional programming is about using functions in the *mathematical*
sense.  A mathematical function maps one value (or tuple of values) to
another value.  The mapped value never varies; if it did, it would be
a different function.  So functional programming eschews the use of
functions where the results depend on any internal or external state
beyond the values of the passed-in arguments, such as the variable
state of the object the method is being called on.

Functional programming and OOP are not entirely opposed -- for
example, string methods in Python such as str.upper are perfectly
functional, since strings are immutable.  Many functional languages
such as Common LISP also have powerful OOP facilities.  Still,
functional programming does not fit well with the traditional OOP
model of objects passing messages to other objects, which generally
implies statefulness.

Cheers,
Ian


From paul at subsignal.org  Sat Sep  3 14:59:27 2011
From: paul at subsignal.org (=?ISO-8859-1?Q?Paul_K=F6lle?=)
Date: Sat, 03 Sep 2011 20:59:27 +0200
Subject: Need advice on Web / Database framework...
In-Reply-To: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
References: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
Message-ID: <j3ttet$fpn$1@dough.gmane.org>

Hi,

Am 03.09.2011 16:11, schrieb Benjamin Schollnick:
> Folks,
>
> I need some advice on a python web&  database framework to use...?
Hardest question ever ;)

>
> I have handcrafted a sqllite3 python script, that is a basic web
> application, interfacing with a sqlite3 database...
>
> But I am concerned at the thought of handcrafting a administration
> interface, and so forth.
If you are not familiar with the various pitfalls of web security I'd 
recomment a framework which has all the layers already integrated. Take 
a look at http://www.web2py.com, I think it's quite powerful and has 
good documentation.
If you want to get your hands dirty you can compose your own "framework" 
cherrypy+sqlalchemy+cheetah might be a good combination.

hth
  Paul



From tjreedy at udel.edu  Sat Sep  3 15:01:31 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:01:31 -0400
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
Message-ID: <j3ttjr$gta$1@dough.gmane.org>

On 9/3/2011 3:51 AM, Yingjie Lan wrote:
> I agree that long lines of code are not very common in many projects,
> though it might be the case with some heavily involved in math. For some
> reason, when the feature of free line breaking came about in computer
> languages, it is welcomed and generally well accepted.

Every language with blocks needs some mechanism to indicate the 
beginning and ending of blocks and of statements within blocks. If 
visible fences ('begin/end' or '{}') and statement terminators (';') are 
used, then '\n' can be treated as merely a space, as it is in C, for 
instance.

> Python uses indentation for blocks,

and it uses unescaped '\n' (with two escapement options) to terminate 
statements. This is fundamental to Python's design and goes along with 
significant indents.

 > and by the same mechanism, line breaking can be
> accommodated without requiring parenthesis or ending backslashes.

You need proof for your claim that indentation can be used for both jobs 
in the form of a grammar that works with Python's parser. I am dubious 
that you can do that with an indents *after* the newline.

Even if you could, it would be confusing for human readers. There would 
then be three ways to escape newline, with one doing double duty. And 
for what? Merely to avoid using either of the two methods already available.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep  3 15:15:28 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:15:28 -0400
Subject: Functions vs OOP
In-Reply-To: <4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j3tue0$m0i$1@dough.gmane.org>

On 9/3/2011 12:25 PM, Steven D'Aprano wrote:
> William Gill wrote:
>
>> During some recent research, and re-familiarization with Python, I came
>> across documentation

Ours, or someone else's?

>> that suggests that programming using functions, and
>> programming using objects were somehow opposing techniques.
>>
>> It seems to me that they are complimentary.  It makes sense to create
>> objects and have some functions that take those objects as arguments.
>
> Python is a mixed paradigm language, with object, functional and imperative
> paradigms.
>
>> Are they suggesting that any function that takes an object as an
>> argument should always be a method of that object?

Or of the class of the object.

> Yes.
> http://steve-yegge.blogspot.com/2006/03/execution-in-kingdom-of-nouns.html

Since in Python, everything is an object, that would mean that every 
function has to be a method, which would mean creating classes just to 
have a class to attach functions to. How awful. (Oh, right, I believe I 
just described Java.)

>> Am I missing something, or am I taking things too literally?
>
> No, it is the OO purists who are missing something.

Yes, Python.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep  3 15:20:52 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:20:52 -0400
Subject: IDLE from python 3.2 constantly crashes
In-Reply-To: <CAKoEMEfVjUuCBEOfCvQUSh4kZ=KMMYqQBvsfZqNKg1cOgJgQ0A@mail.gmail.com>
References: <CAKoEMEfVjUuCBEOfCvQUSh4kZ=KMMYqQBvsfZqNKg1cOgJgQ0A@mail.gmail.com>
Message-ID: <j3tuo4$o09$1@dough.gmane.org>

On 9/3/2011 1:54 PM, Joshua Miller wrote:
> Ok i've been using IDLE on my home computer and everytime i try and
> open a file that i saved to my hdd instead of my flashdrive(because
> it's a school project) by accident, it opens for a second and i try to
> do something else like open another file and it crashes. Is there
> anyway to remedy this error?
>
> By the way i'm running python 3.2 on windows 7 if it makes a difference

Since I and others am using the same (3.2 on Win 7) quite successfully, 
it is hard to know what the problem is with your setup. Start with more 
details of exactly what you do and what 'it crashes' means.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep  3 15:23:13 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 15:23:13 -0400
Subject: SSL module needs issuer information
In-Reply-To: <4e626d97$0$1665$742ec2ed@news.sonic.net>
References: <4e626d97$0$1665$742ec2ed@news.sonic.net>
Message-ID: <j3tush$o09$2@dough.gmane.org>

On 9/3/2011 2:10 PM, John Nagle wrote:
> The SSL module still doesn't return much information from the
> certificate. SSLSocket.getpeercert only returns a few basic items
> about the certificate subject. You can't retrieve issuer information,
> and you can't get the extensions needed to check if a cert is an EV cert.
>
> With the latest flaps about phony cert issuers, it's worth
> having issuer info available. It was available in the old M2Crypto
> module, but not in the current Python SSL module.

Check the tracker to see if there is an issue about this already. If 
not, open one with a specific feature request.

-- 
Terry Jan Reedy



From noreply at domain.invalid  Sat Sep  3 17:09:03 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:09:03 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.736.1315067353.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.736.1315067353.27778.python-list@python.org>
Message-ID: <j3u4vv$5ho$1@dont-email.me>

On 9/3/2011 12:29 PM, MRAB wrote:
> I think you mean "complementary". :-)
How polite of you to point out my spelling deficiency.  I guess 
shouldn't be watching football while typing (I'm sure the beer didn't 
help either).

> I think that it's all about "state".
>
> In functional programming, there's no state; a function's result
> depends solely on its arguments, so it will always return the same
> result for the same given arguments.
>
> In OOP, on the other hand, an object often has a state; a method may
> return a different result each time it's called, even for the same
> given arguments.

I think you mean "it [sic, a function] will "return the same result for 
the same given values..."

     x=1
     y= myFn(x)

will return the same result as

     y= myFn(1)

A method may use an attribute as an implicit argument, and that 
attribute's value change, just like the value of x (above) may change. 
It may or may not return anything (it may just modify an attribute).

The question wasn't about encapsulation, it was about programming 
paradigms, and if they conflict.

As was pointed out elsewhere, I may have just confused "functional 
programming" with "programming using functions".




From noreply at domain.invalid  Sat Sep  3 17:13:06 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:13:06 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.743.1315075846.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
Message-ID: <j3u57g$742$1@dont-email.me>

On 9/3/2011 2:50 PM, Ian Kelly wrote:

> I think you may be confusing "functional programming" and "programming
> using functions".  These are not the same thing.
>

I think you may be right, Ian.  It didn't make much sense




From noreply at domain.invalid  Sat Sep  3 17:34:05 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:34:05 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.746.1315077390.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
Message-ID: <j3u6es$e6i$1@dont-email.me>

On 9/3/2011 3:15 PM, Terry Reedy wrote:
>> William Gill wrote:
>>
>>> During some recent research, and re-familiarization with Python, I came
>>> across documentation
>
> Ours, or someone else's?

Python.

>
> Since in Python, everything is an object, that would mean that every
> function has to be a method, which would mean creating classes just to
> have a class to attach functions to. How awful.

Exactly why I asked, but I realize the the mistake was mine.  I think 
they were talking about "functional programming" not "using functions in 
an OO program."



From ben+python at benfinney.id.au  Sat Sep  3 17:39:30 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 04 Sep 2011 07:39:30 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
Message-ID: <87bov1qp9p.fsf@benfinney.id.au>

William Gill <noreply at domain.invalid> writes:

> On 9/3/2011 3:15 PM, Terry Reedy wrote:
> >> William Gill wrote:
> >>
> >>> During some recent research, and re-familiarization with Python, I
> >>> came across documentation
> >
> > Ours, or someone else's?
>
> Python.

Can you show exactly where in the Python documentation you found the
passage which confused you?

-- 
 \           ?If you're a cowboy and you're dragging a guy behind your |
  `\      horse, I bet it would really make you mad if you looked back |
_o__)                and the guy was reading a magazine.? ?Jack Handey |
Ben Finney


From nospam at domain.invalid  Sat Sep  3 17:58:01 2011
From: nospam at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 17:58:01 -0400
Subject: Functions vs OOP
In-Reply-To: <87bov1qp9p.fsf@benfinney.id.au>
References: <j3tjov$c30$1@dont-email.me>	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>	<mailman.746.1315077390.27778.python-list@python.org>	<j3u6es$e6i$1@dont-email.me>
	<87bov1qp9p.fsf@benfinney.id.au>
Message-ID: <j3u7tc$kcq$1@dont-email.me>

On 9/3/2011 5:39 PM, Ben Finney wrote:
> William Gill<noreply at domain.invalid>  writes:
>
>> On 9/3/2011 3:15 PM, Terry Reedy wrote:
>>>> William Gill wrote:
>>>>
>>>>> During some recent research, and re-familiarization with Python, I
>>>>> came across documentation
>>>
>>> Ours, or someone else's?
>>
>> Python.
>
> Can you show exactly where in the Python documentation you found the
> passage which confused you?
>
Sorry, no.  I tried to locate the exact reference again, and couldn't 
remember where I read it (short term memory problems).


From bkasterm at gmail.com  Sat Sep  3 18:15:18 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Sat, 03 Sep 2011 16:15:18 -0600
Subject: Tkinter label height to fit content
Message-ID: <87mxelgtmx.fsf@gmail.com>


I have a label into which I am going to put content of different
sizes. I would like to know how high I need to make the label so that I
can size the window so it can stay the same for the different content
sizes. I have a strategy, but it seems more complicated then it should
be.

I want to set a label to a given width and wraplength:

l = Label(root)
l['width'] = 30
l['wraplength'] = 244
l['text'] = "testing this"

Now I want to query the label to find how many lines are
used. l['height'] stays at 0, so the best I have been able to come up
with is to use l.winfo_height() and convert the height given in pixels
to the number of lines used. Nothing in dir(l) seems to give me the
information directly, but this strategy is fragile to font changes and
other changes.

Any suggestions?


From PointedEars at web.de  Sat Sep  3 18:58:15 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Sun, 04 Sep 2011 00:58:15 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
	<6545843.yvFAXZvWTv@PointedEars.de>
	<9c528rFi5aU1@mid.individual.net>
	<4761603.ypaU67uLZW@PointedEars.de>
	<9c6d4cFa54U1@mid.individual.net>
Message-ID: <109595831.VCN276Cjj6@PointedEars.de>

Fokke Nauta wrote:

> "Thomas 'PointedEars' Lahn" [?]:
>> Fokke Nauta wrote:
>>> "Thomas 'PointedEars' Lahn" [?] wrote:
>>>> The Python shell executes Python code.  The above obviously is not
>>>> Python
>>>> code, but *system* shell commands.  So let the *system* command shell
>>>> execute them (as indicated by the `$' prompt, which is customary for a
>>>> sh-based UNIX/Linux shell prompt).
>>> I know. I worked with SCO Unix and various sorts of Linux.
>>> But never with Python, so I hadn't got a clue about the prompt.
>> Come on, with that experience you see a `$' and those commands and don't
>> realize it is (ba)sh?
> 
> Ofcourse I realized it was Unix/Linux. I already could tell that as the
> packages I downloaded were tar.gz files.

For *Windows*?

> So I unpacked them and expected to run a Python installer script from the
> Python command line.

Again, given all that experience you claim to have, how come it did not 
occur to you that the `$' was meant to be a *command* *shell* prompt?  Other 
OSes have command shells, too, you know; they are just named and run 
differently.

> Tried to run the Python installer script from the DOS command line but
> that resulted in an error.

"There was an error" is no error report at all.
 
>>>> However, you appear to have found the *UNIX/Linux* README (and the
>>>> corresponding version?) of that server: the second command is usually
>>>> how you would run a program as daemon on Unices (run through an init
>>>> script), while on Windows NT (like XP) you would have a setup program
>>>> install a service for you (maybe to execute that command when the
>>>> service is started).  Look for the Windows version.
>>> There is no other Windows version except the packages I mentioned,
>>> PyWebDAV and PyXML. The only Windows thing I got was the Python
>>> interpreter itself.
>> Has it not occurred to you to STFW for "easy_install" first?
> 
> What do you mean by STFW?

Search The F****ing Web.

> I wasn't aware that easy_install was a utility. Downloaded and installed
> the Windows version and run easy_install pywebdav.
> It downloaded something, installed something and finished something.
> But, once again, don't know how to proceed.

RTFM.

>>>>> And there is no easy_install script in the PyXML-0.8.4
>>>>> directory, only a setup.py and ez_setup.py script. I guess the latter
>>>>> is
>>>>> the one to use. But how?
>>>> RTFM.
>>> Which fucking manual?
>> That of the server, on Windows-related information.  Or that of
>> easy_install.  Or Python.  Whichever comes first.
> 
> It's my own server and I didn't write a manual for it.

No, the people providing it for you obviously did, but you do not seem to 
care to read it.

> In the manual of Easy_install it says how to install packaged etc and I
> did sucessfully.
> There is no furter information as how to proceed.

Either you are lying, or you are really forgetful, or you are simply not 
smart enough for this.  You yourself told me/us before what the next step 
is:

>>>>> How do I proceed next?
>>>> Look for the Windows version.  If there is none, get easy_install and
>>>> use
>>>> it as described.
> 
> I did and it worked. What's next?

Start the now-installed server, for goodness' sake!

Observing this, be reminded that playing stupid does not work with me:

<http://catb.org/~esr/faqs/smart-questions.html>

And please get rid of that attribution novel and trim your quotes to the 
relevant minimum.  I am asking you the last time here.  If you cannot find 
it within you to think about your readers when you post, you are not worth 
my attention or (free) time.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From lanyjie at yahoo.com  Sat Sep  3 19:22:57 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sat, 3 Sep 2011 16:22:57 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <j3ttjr$gta$1@dough.gmane.org>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<j3ttjr$gta$1@dough.gmane.org>
Message-ID: <1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>

>?Every language with blocks needs some mechanism to indicate the beginning and ending of blocks and of statements within blocks. If visible fences ('begin/end' or '{}') and statement terminators (';') are used, then '\n' can be treated as merely a space, as it is in C, for instance.?

>?and it uses unescaped '\n' (with two escapement options) to terminate statements. This is fundamental to Python's design and goes along with significant indents.

Agreed.?Currently indentation in Python starts a new block,?but if you view it from the perspective of line breaking,?it also functions as if the line is continued. The line of code below

if condition: do_a(); do_b()

can be ?written as:

if condition: #line breaks
do_a(); # ';' is optional here?
do_b() # continue

That indentation can be also employed for line breaking is quite evident to me. During the open email correspondence with Stephen, it seems to be a tenable point.?

>?There would then be three ways to escape newline, with one doing double duty. And for what? Merely to avoid using either of the two methods already available.

I believe the other two ways are not as good as this new way. As the proposal is fully backward compatible, people may choose whatever way they prefer.?


>________________________________
>From: Terry Reedy <tjreedy at udel.edu>
>To: python-list at python.org
>Cc: python-ideas at python.org
>Sent: Sunday, September 4, 2011 3:01 AM
>Subject: Re: [Python-ideas] allow line break at operators
>
>On 9/3/2011 3:51 AM, Yingjie Lan wrote:
>> I agree that long lines of code are not very common in many projects,
>> though it might be the case with some heavily involved in math. For some
>> reason, when the feature of free line breaking came about in computer
>> languages, it is welcomed and generally well accepted.
>
>Every language with blocks needs some mechanism to indicate the beginning and ending of blocks and of statements within blocks. If visible fences ('begin/end' or '{}') and statement terminators (';') are used, then '\n' can be treated as merely a space, as it is in C, for instance.
>
>> Python uses indentation for blocks,
>
>and it uses unescaped '\n' (with two escapement options) to terminate statements. This is fundamental to Python's design and goes along with significant indents.
>
>> and by the same mechanism, line breaking can be
>> accommodated without requiring parenthesis or ending backslashes.
>
>You need proof for your claim that indentation can be used for both jobs in the form of a grammar that works with Python's parser. I am dubious that you can do that with an indents *after* the newline.
>
>Even if you could, it would be confusing for human readers. There would then be three ways to escape newline, with one doing double duty. And for what? Merely to avoid using either of the two methods already available.
>
>-- Terry Jan Reedy
>
>-- http://mail.python.org/mailman/listinfo/python-list
>
>
>
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From gelonida at gmail.com  Sat Sep  3 20:15:32 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 04 Sep 2011 02:15:32 +0200
Subject: SSL module needs issuer information
In-Reply-To: <4e626d97$0$1665$742ec2ed@news.sonic.net>
References: <4e626d97$0$1665$742ec2ed@news.sonic.net>
Message-ID: <j3ufv5$k1t$1@dough.gmane.org>

Hi John,

On 09/03/2011 08:10 PM, John Nagle wrote:
>   The SSL module still doesn't return much information from the
> certificate.  SSLSocket.getpeercert only returns a few basic items
> about the certificate subject.  You can't retrieve issuer information,
> and you can't get the extensions needed to check if a cert is an EV cert.
> 
>   With the latest flaps about phony cert issuers, it's worth
> having issuer info available.  It was available in the old M2Crypto
> module, but not in the current Python SSL module.

Your phrasing 'old M2Crypto' disturbs me slightly.

I am using Python 2.6. Is M2Crypto also obsolete for python 2.6?

Is there any serious alternative if I want to verify the server
certificate in a safe way (and if I want to send a client certificate)??


I am in search for a set of libraries, which allows me to:

- verify the server certificate (ideally via a custom call back, which
can inspect the certificate data and then decide whether the certificate
shall be accepted or not)
	
- send a client certificate

- use https with a cookie jar (ideally even persistent, but session
cookies are enough)

- do XMLRPC calls (but send cookies in the headers)

Would m2crypto be the right choice?




From gelonida at gmail.com  Sat Sep  3 20:18:34 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 04 Sep 2011 02:18:34 +0200
Subject: Need advice on Web / Database framework...
In-Reply-To: <j3ttet$fpn$1@dough.gmane.org>
References: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
	<j3ttet$fpn$1@dough.gmane.org>
Message-ID: <j3ug4q$k1t$2@dough.gmane.org>

Hi Paul,

On 09/03/2011 08:59 PM, Paul K?lle wrote:
> Am 03.09.2011 16:11, schrieb Benjamin Schollnick:
>> Folks,
>>
>> I need some advice on a python web&  database framework to use...?
> Hardest question ever ;)
. . .
>> But I am concerned at the thought of handcrafting a administration
>> interface, and so forth.
> If you are not familiar with the various pitfalls of web security I'd
> recomment a framework which has all the layers already integrated. Take
> a look at http://www.web2py.com, I think it's quite powerful and has
> good documentation.
> If you want to get your hands dirty you can compose your own "framework"
> cherrypy+sqlalchemy+cheetah might be a good combination.
> 

How does web2py compare to django? I just started playing with django,
but don't know web2py




From rantingrick at gmail.com  Sat Sep  3 21:15:52 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 3 Sep 2011 18:15:52 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
Message-ID: <69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>

On Sep 3, 5:15?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> Any suggestions?

Yeah, have you considered using the "linespace()" method of tk.Font
objects to calculate the height? Although i must say it "feels" as if
your doing something you should not need to do, however i cannot be
sure without knowing more about this GUI. Sounds a lot like trying to
put socks on a rooster.

http://infohost.nmt.edu/tcc/help/pubs/tkinter/std-attrs.html#fonts


From tjreedy at udel.edu  Sat Sep  3 21:51:37 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 03 Sep 2011 21:51:37 -0400
Subject: Functions vs OOP
In-Reply-To: <j3u6es$e6i$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
Message-ID: <j3ulkp$e3o$1@dough.gmane.org>

On 9/3/2011 5:34 PM, William Gill wrote:
> On 9/3/2011 3:15 PM, Terry Reedy wrote:
>>> William Gill wrote:
>>>
>>>> During some recent research, and re-familiarization with Python, I came
>>>> across documentation
>>
>> Ours, or someone else's?
>
> Python.
>
>>
>> Since in Python, everything is an object, that would mean that every
>> function has to be a method, which would mean creating classes just to
>> have a class to attach functions to. How awful.
>
> Exactly why I asked, but I realize the the mistake was mine. I think
> they were talking about "functional programming" not "using functions in
> an OO program."

It is possible that our doc was less than crystal clear. We are 
constantly improving it where we can see fixable faults. If you run 
across whatever it was and it still seems a bit muddy, post something again.

-- 
Terry Jan Reedy



From python at mrabarnett.plus.com  Sat Sep  3 22:04:54 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 04 Sep 2011 03:04:54 +0100
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<j3ttjr$gta$1@dough.gmane.org>
	<1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>
Message-ID: <4E62DCC6.8000906@mrabarnett.plus.com>

On 04/09/2011 00:22, Yingjie Lan wrote:
>>  Every language with blocks needs some mechanism to indicate the
> beginning and ending of blocks and of statements within blocks. If
> visible fences ('begin/end' or '{}') and statement terminators (';') are
> used, then '\n' can be treated as merely a space, as it is in C, for
> instance.
>>  and it uses unescaped '\n' (with two escapement options) to terminate
> statements. This is fundamental to Python's design and goes along with
> significant indents.
>
> Agreed. Currently indentation in Python starts a new block, but if you
> view it from the perspective of line breaking, it also functions as if
> the line is continued. The line of code below
>
> if condition: do_a(); do_b()
>
> can be written as:
>
> if condition: #line breaks
> do_a(); # ';' is optional here
> do_b() # continue
>
> That indentation can be also employed for line breaking is quite evident
> to me. During the open email correspondence with Stephen, it seems to be
> a tenable point.
>
>  > There would then be three ways to escape newline, with one doing
> double duty. And for what? Merely to avoid using either of the two
> methods already available.
>
> I believe the other two ways are not as good as this new way. As the
> proposal is fully backward compatible, people may choose whatever way
> they prefer.
>
I think that the rules would be:

If a line ends with a colon and the next line is indented, then it's
the start of a block, and the following lines which belong to that
block have the same indent.

If a line doesn't end with a colon but the next line is indented, then
it's the start of a continuation, and the following lines which belong
to that continuation have the same indent.

In both cases there could be blocks nested in blocks and possibly
continuations nested in continuations, as well as blocks nested in
continuations and continuations nested in blocks.

I'm not sure what the effect would be if you had mis-indented lines.
For example, if a line was accidentally indented after a comment, then
it would be treated as part of the comment. It's in cases like those
that syntax colouring would be helpful. It would be a good idea to use
an editor which could indicate in some way when a line is a
continuation.

>     ------------------------------------------------------------------------
>     *From:* Terry Reedy <tjreedy at udel.edu>
>     *To:* python-list at python.org
>     *Cc:* python-ideas at python.org
>     *Sent:* Sunday, September 4, 2011 3:01 AM
>     *Subject:* Re: [Python-ideas] allow line break at operators
>
>     On 9/3/2011 3:51 AM, Yingjie Lan wrote:
>      > I agree that long lines of code are not very common in many projects,
>      > though it might be the case with some heavily involved in math.
>     For some
>      > reason, when the feature of free line breaking came about in computer
>      > languages, it is welcomed and generally well accepted.
>
>     Every language with blocks needs some mechanism to indicate the
>     beginning and ending of blocks and of statements within blocks. If
>     visible fences ('begin/end' or '{}') and statement terminators (';')
>     are used, then '\n' can be treated as merely a space, as it is in C,
>     for instance.
>
>      > Python uses indentation for blocks,
>
>     and it uses unescaped '\n' (with two escapement options) to
>     terminate statements. This is fundamental to Python's design and
>     goes along with significant indents.
>
>      > and by the same mechanism, line breaking can be
>      > accommodated without requiring parenthesis or ending backslashes.
>
>     You need proof for your claim that indentation can be used for both
>     jobs in the form of a grammar that works with Python's parser. I am
>     dubious that you can do that with an indents *after* the newline.
>
>     Even if you could, it would be confusing for human readers. There
>     would then be three ways to escape newline, with one doing double
>     duty. And for what? Merely to avoid using either of the two methods
>     already available.
>



From noreply at domain.invalid  Sat Sep  3 22:18:19 2011
From: noreply at domain.invalid (William Gill)
Date: Sat, 03 Sep 2011 22:18:19 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.752.1315101158.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
	<mailman.752.1315101158.27778.python-list@python.org>
Message-ID: <j3un3p$edj$1@dont-email.me>

On 9/3/2011 9:51 PM, Terry Reedy wrote:
>
> It is possible that our doc was less than crystal clear. We are
> constantly improving it where we can see fixable faults. If you run
> across whatever it was and it still seems a bit muddy, post something
> again.
>
Will do.

Thanks.


From shilparani9030 at gmail.com  Sat Sep  3 23:14:29 2011
From: shilparani9030 at gmail.com (SHILPA)
Date: Sat, 3 Sep 2011 20:14:29 -0700 (PDT)
Subject: KATRINA KAIF RARE PHOTOS
Message-ID: <66624c9c-94ca-44a1-a6f1-fc67871b334b@r40g2000prf.googlegroups.com>

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From jehugaleahsa at gmail.com  Sat Sep  3 23:35:24 2011
From: jehugaleahsa at gmail.com (Travis Parks)
Date: Sat, 3 Sep 2011 20:35:24 -0700 (PDT)
Subject: Algorithms Library - Asking for Pointers
References: <beb607c3-1642-4663-a0f7-626d0814f0bd@dl2g2000vbb.googlegroups.com>
	<mailman.718.1314994196.27778.python-list@python.org>
	<8f893753-abbc-47df-9d90-77263e96be1b@p10g2000yqi.googlegroups.com>
	<18fe4afd-569b-4580-a629-50f6c74829e8@c29g2000yqd.googlegroups.com>
	<j3sapp01jeh@news1.newsguy.com>
Message-ID: <112f5d1d-fbf7-44da-a0dd-cbbeb3a59c6d@dq7g2000vbb.googlegroups.com>

On Sep 3, 12:35?am, Chris Torek <nos... at torek.net> wrote:
> In article <18fe4afd-569b-4580-a629-50f6c7482... at c29g2000yqd.googlegroups.com>
> Travis Parks ?<jehugalea... at gmail.com> wrote:
>
> >[Someone] commented that the itertools algorithms will perform
> >faster than the hand-written ones. Are these algorithms optimized
> >internally?
>
> They are written in C, so avoid a lot of CPython interpreter
> overhead. ?Mileage in Jython, etc., may vary...
> --
> In-Real-Life: Chris Torek, Wind River Systems
> Intel require I note that my opinions are not those of WRS or Intel
> Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W) ?+1 801 277 2603
> email: gmail (figure it out) ? ? ?http://web.torek.net/torek/index.html

I thought I would point out that many of the itertools functions
change between 2.x and 3.x versions. Since 2.7 is supposed to be the
last 2.x language, I suppose I will wait until 3.2 becomes the norm
before I incorporate some of these changes. In the mean time, I will
starting working on algorithms that work against Sequences.

I think a really important lesson is that Python really doesn't need
an algorithms library, like many others do. A lot of the common
algorithms are supported by the syntax itself. All my library did was
allow for easier function composition.


From d_vineet at yahoo.com  Sun Sep  4 01:03:08 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Sat, 3 Sep 2011 22:03:08 -0700 (PDT)
Subject: my suggestions for framework
Message-ID: <1315112588.16268.YahooMailNeo@web160517.mail.bf1.yahoo.com>

> recomment a framework which has all the layers already integrated. Take
> a look at http://www.web2py.com, I think it's quite powerful and has
> good documentation.
> If you want to get your hands dirty you can compose your own "framework"
> cherrypy+sqlalchemy+cheetah might be a good combination.
> 

How does web2py compare to django? I just started playing with django,
but don't know web2py

----

IMHO, django is suitable for CMS kind of apps.
AFAIK, originally it was written for a newspaper website, subsequently it has grown over the time.
I have tried turbogears(TG), django & web2py.

TG is like picking all good eggs from different open source projects. It integrates sqlalchemy, genshi, cheetah, pylons, for sql abstraction layer, templating system, web server respectively.
One can choose other options also, if desired.
-1 for TG is its complexity and not-so-good docs, too many dependencies.
?
django has very good docs & active community.
It is better in terms of simplicity & dependency?as compared to TG.
?
web2py is vastly flexible, no dependencies, no installation required, just plug & play, very good community & docs.
Honestly, I did not find any -1 for web2py.
?
Of course, one has to form his/her own opinion.
On stackoverflow.com, there are plenty of threads which compare the python frameworks.
?
:-)
---Vineet
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From tinnews at isbd.co.uk  Sun Sep  4 04:13:49 2011
From: tinnews at isbd.co.uk (tinnews at isbd.co.uk)
Date: Sun, 4 Sep 2011 09:13:49 +0100
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
Message-ID: <tiobj8-sng.ln1@chris.zbmc.eu>

Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Sat, Sep 3, 2011 at 10:15 AM, William Gill <noreply at domain.invalid> wrote:
> > During some recent research, and re-familiarization with Python, I came
> > across documentation that suggests that programming using functions, and
> > programming using objects were somehow opposing techniques.
> >
> > It seems to me that they are complimentary. ?It makes sense to create
> > objects and have some functions that take those objects as arguments. Are
> > they suggesting that any function that takes an object as an argument should
> > always be a method of that object? ?Conversely I can see creating functions
> > that take raw input (e.g. strings) and return it in a format compatible with
> > an object's constructor, rather than have objects accept any conceivable
> > format for its constructor.
> >
> > Am I missing something, or am I taking things too literally?
> 
> I think you may be confusing "functional programming" and "programming
> using functions".  These are not the same thing.
> 
> Functional programming is about using functions in the *mathematical*
> sense.  A mathematical function maps one value (or tuple of values) to
> another value.  The mapped value never varies; if it did, it would be
> a different function.  So functional programming eschews the use of
> functions where the results depend on any internal or external state
> beyond the values of the passed-in arguments, such as the variable
> state of the object the method is being called on.
> 
I think there may be another issue here.  If someone says "functional
programming" to me then I would generally assume that they *do* mean
"programming using functions".  While your distinction of the two may
be strictly correct I don't think it's the generally accepted meaning.

-- 
Chris Green


From fnautaNO at SPAMsolfon.nl  Sun Sep  4 04:59:41 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Sun, 4 Sep 2011 10:59:41 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
	<6545843.yvFAXZvWTv@PointedEars.de>
	<9c528rFi5aU1@mid.individual.net>
	<4761603.ypaU67uLZW@PointedEars.de>
	<9c6d4cFa54U1@mid.individual.net>
	<109595831.VCN276Cjj6@PointedEars.de>
Message-ID: <9cgsvvFdhuU1@mid.individual.net>


"Thomas 'PointedEars' Lahn" <PointedEars at web.de> wrote in message 
news:109595831.VCN276Cjj6 at PointedEars.de...

<cut>

If you don't have anything better to contribute, please stop answering.

Es gen?gt schon.

Fokke 




From adam.jorgensen.za at gmail.com  Sun Sep  4 05:05:32 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Sun, 4 Sep 2011 11:05:32 +0200
Subject: Functions vs OOP
In-Reply-To: <j3un3p$edj$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.746.1315077390.27778.python-list@python.org>
	<j3u6es$e6i$1@dont-email.me>
	<mailman.752.1315101158.27778.python-list@python.org>
	<j3un3p$edj$1@dont-email.me>
Message-ID: <CAMX1Rom9Y9xy+SGe6Sjm_r56t1DUM1PssCb1pWJ3TL8wvuKcyQ@mail.gmail.com>

Progranming with functions vs Progranming with objects sounds like C vs. C++
more than functional programming vs. OO programming

On 4 September 2011 04:18, William Gill <noreply at domain.invalid> wrote:

> On 9/3/2011 9:51 PM, Terry Reedy wrote:
>
>>
>> It is possible that our doc was less than crystal clear. We are
>> constantly improving it where we can see fixable faults. If you run
>> across whatever it was and it still seems a bit muddy, post something
>> again.
>>
>>  Will do.
>
> Thanks.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
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From lanyjie at yahoo.com  Sun Sep  4 05:58:08 2011
From: lanyjie at yahoo.com (Yingjie Lan)
Date: Sun, 4 Sep 2011 02:58:08 -0700 (PDT)
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <4E62DCC6.8000906@mrabarnett.plus.com>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc!
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<j3ttjr$gta$1@dough.gmane.org>
	<1315092177.54288.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<4E62DCC6.8000906@mrabarnett.plus.com>
Message-ID: <1315130288.86666.YahooMailNeo@web121515.mail.ne1.yahoo.com>


>
Thanks, I think that's the rule described in its full glory. Currently I am not ?quite sure of the use case for continuation nested in continuation -- it seems to be still a single continuation, but it allows for some additional freedom in formatting the continued line. Do you have other use cases for that?


For the case of mis-indentation, as demonstrated in your scenario,?I think it is better that the rule is not applied to a comment?continued onto the next line. The effect of a '#' only carries to the end of a line, if one would like the next line to be a comment, just use another '#'. It remains to consider a mis-indentation that only involves code lines. However, that is not a new problem, so we should not worry (it is like a sunken cost).?

Sorry for top posting. It seems yahoo web email is not designed with such a use case in mind.


>________________________________
>From: MRAB <python at mrabarnett.plus.com>
>To: python-list at python.org
>Sent: Sunday, September 4, 2011 10:04 AM
>Subject: Re: [Python-ideas] allow line break at operators
>
>On 04/09/2011 00:22, Yingjie Lan wrote:
>>>? Every language with blocks needs some mechanism to indicate the
>> beginning and ending of blocks and of statements within blocks. If
>> visible fences ('begin/end' or '{}') and statement terminators (';') are
>> used, then '\n' can be treated as merely a space, as it is in C, for
>> instance.
>>>? and it uses unescaped '\n' (with two escapement options) to terminate
>> statements. This is fundamental to Python's design and goes along with
>> significant indents.
>>
>> Agreed. Currently indentation in Python starts a new block, but if you
>> view it from the perspective of line breaking, it also functions as if
>> the line is continued. The line of code below
>>
>> if condition: do_a(); do_b()
>>
>> can be written as:
>>
>> if condition: #line breaks
>> do_a(); # ';' is optional here
>> do_b() # continue
>>
>> That indentation can be also employed for line breaking is quite evident
>> to me. During the open email correspondence with Stephen, it seems to be
>> a tenable point.
>>
>>? > There would then be three ways to escape newline, with one doing
>> double duty. And for what? Merely to avoid using either of the two
>> methods already available.
>>
>> I believe the other two ways are not as good as this new way. As the
>> proposal is fully backward compatible, people may choose whatever way
>> they prefer.
>>
>I think that the rules would be:
>
>If a line ends with a colon and the next line is indented, then it's
>the start of a block, and the following lines which belong to that
>block have the same indent.
>
>If a line doesn't end with a colon but the next line is indented, then
>it's the start of a continuation, and the following lines which belong
>to that continuation have the same indent.
>
>In both cases there could be blocks nested in blocks and possibly
>continuations nested in continuations, as well as blocks nested in
>continuations and continuations nested in blocks.
>
>I'm not sure what the effect would be if you had mis-indented lines.
>For example, if a line was accidentally indented after a comment, then
>it would be treated as part of the comment. It's in cases like those
>that syntax colouring would be helpful. It would be a good idea to use
>an editor which could indicate in some way when a line is a
>continuation.
>
>>? ?  ------------------------------------------------------------------------
>>? ?  *From:* Terry Reedy <tjreedy at udel.edu>
>>? ?  *To:* python-list at python.org
>>? ?  *Cc:* python-ideas at python.org
>>? ?  *Sent:* Sunday, September 4, 2011 3:01 AM
>>? ?  *Subject:* Re: [Python-ideas] allow line break at operators
>>
>>? ?  On 9/3/2011 3:51 AM, Yingjie Lan wrote:
>>? ? ? > I agree that long lines of code are not very common in many projects,
>>? ? ? > though it might be the case with some heavily involved in math.
>>? ?  For some
>>? ? ? > reason, when the feature of free line breaking came about in computer
>>? ? ? > languages, it is welcomed and generally well accepted.
>>
>>? ?  Every language with blocks needs some mechanism to indicate the
>>? ?  beginning and ending of blocks and of statements within blocks. If
>>? ?  visible fences ('begin/end' or '{}') and statement terminators (';')
>>? ?  are used, then '\n' can be treated as merely a space, as it is in C,
>>? ?  for instance.
>>
>>? ? ? > Python uses indentation for blocks,
>>
>>? ?  and it uses unescaped '\n' (with two escapement options) to
>>? ?  terminate statements. This is fundamental to Python's design and
>>? ?  goes along with significant indents.
>>
>>? ? ? > and by the same mechanism, line breaking can be
>>? ? ? > accommodated without requiring parenthesis or ending backslashes.
>>
>>? ?  You need proof for your claim that indentation can be used for both
>>? ?  jobs in the form of a grammar that works with Python's parser. I am
>>? ?  dubious that you can do that with an indents *after* the newline.
>>
>>? ?  Even if you could, it would be confusing for human readers. There
>>? ?  would then be three ways to escape newline, with one doing double
>>? ?  duty. And for what? Merely to avoid using either of the two methods
>>? ?  already available.
>>
>
>-- 
>http://mail.python.org/mailman/listinfo/python-list
>
>
>
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From alexandru at bastilla.coruscant.org.invalid  Sun Sep  4 06:07:26 2011
From: alexandru at bastilla.coruscant.org.invalid (Alexandru Lazar)
Date: Sun, 4 Sep 2011 10:07:26 +0000 (UTC)
Subject: Need advice on Web / Database framework...
References: <21960A6D-CD06-4F0C-AC35-8D176E964B38@schollnick.net>
	<j3ttet$fpn$1@dough.gmane.org>
	<mailman.751.1315095608.27778.python-list@python.org>
Message-ID: <j3viku$c7v$1@dont-email.me>

> How does web2py compare to django? I just started playing with django,
> but don't know web2py

I haven't used Django, but I did use web2py for a project that fell on my
head just before leaving my old workplace. I just wanted it to end quickly
so I took web2py as a shortcut.

It's a great framework -- there seems to be an abstraction layer for
anything, so you can write a fairly pythonic web app with it. The app I
had to write was fairly trivial to be sure, and I barely had to write
any code at all.

What I didn't quite like about it was the documentation, that felt rather
sketchy. There's the Official Web2py Book, but that has more of a tutorial
structure. The API reference feels a tad sketchy and I sometimes had to
guess my way around. But there's a good chance that this is just my bad
impression, as I am not a web developer.

Alex


From steve+comp.lang.python at pearwood.info  Sun Sep  4 07:18:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 04 Sep 2011 21:18:53 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
	<tiobj8-sng.ln1@chris.zbmc.eu>
Message-ID: <4e635e9e$0$29984$c3e8da3$5496439d@news.astraweb.com>

tinnews at isbd.co.uk wrote:

> I think there may be another issue here.  If someone says "functional
> programming" to me then I would generally assume that they *do* mean
> "programming using functions".  

Strictly speaking you are correct, "functional programming" does
mean "programming using functions", the usual name for which is "procedural
programming". But it means more than that: functions in the sense of
mathematical functions, not merely sub-routines.

http://en.wikipedia.org/wiki/Functional_programming

Merely using functions is not the same as functional programming.

> While your distinction of the two may 
> be strictly correct I don't think it's the generally accepted meaning.

On the contrary, "functional programming" specifically refers to languages
derived from, based on, or at least inspired by, the ideas of Alonzo
Church's lambda calculus. It should be understood as somewhat in opposition
to the idea of imperative programming, where the programmer gives
instructions for changing program state.

http://en.wikipedia.org/wiki/Programming_paradigm

In practice, there are degrees of purity: strictly speaking, a purely
functional language would be impractical, because it would have no I/O and
therefore not be very useful. But generally, functional programming
implies:

- all coding is done using functions
- functions are first-class data values
- higher-order functions are used (functions which take functions as
arguments)
- no global variables
- all data is immutable (cannot be modified)
- functions should always return the same result each time they are called
with the same arguments (so-called "referential transparency")
- computations should be performed lazily as needed
- no side-effects other than those caused by hardware limitations (e.g.
there is only a finite amount of memory available), usually with an
exemption made for I/O
- use of recursion instead of imperative features such as iteration (for
loops, while loops, etc.)


Pure functional programming languages enforce those conventions as design
features, rather than just leaving it up to the coder to apply them as a
convention. Impure functional languages, such as Python, don't enforce all
(or even any) of those conditions, although they may provide certain
functional features.



-- 
Steven



From rustompmody at gmail.com  Sun Sep  4 09:13:58 2011
From: rustompmody at gmail.com (rusi)
Date: Sun, 4 Sep 2011 06:13:58 -0700 (PDT)
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>
Message-ID: <d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>

On Sep 3, 9:15?pm, William Gill <nore... at domain.invalid> wrote:
> During some recent research, and re-familiarization with Python, I came
> across documentation that suggests that programming using functions, and
> programming using objects were somehow opposing techniques.

Staying with (for the moment) the suggestion that OO-P and F-P are
complementary, I believe it is worthwhile to distinguish syntactic OO-
P vs F-P from semantic OO-P vs F-P.

Syntactically: f(x) is functional x.f() is object oriented.
Semantically if f's return value depends only on x ie does not depend
on state it is functional (in the math sense) -- the jargon is that f
is referentially transparent.

Referential opaqueness is usually such a source of problems that it
turns out good to contain the problem somewhat -- hence the wish for
encapsulation.

One can find in the python library itself all 4 combinations:
syntactically and semantically OO : sort
syntactically and semantically FP: sorted
syntactically OO semantically FP: join


From erik.williamson at gmail.com  Sun Sep  4 10:22:07 2011
From: erik.williamson at gmail.com (Erik)
Date: Sun, 4 Sep 2011 07:22:07 -0700 (PDT)
Subject: Can't use subprocess.Popen() after os.chroot() - why?
Message-ID: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>

Hi All,

I'm trying to do the following: 

import os
from subprocess import Popen, PIPE

os.chroot("/tmp/my_chroot")
p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
stdout_val, stderr_val = p.communicate()
print stdout_val

but the Popen call is dying with the following exception:

Traceback (most recent call last):
  File "./test.py", line 7, in <module>
    p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
  File "/home/erik/lib/python2.7/subprocess.py", line 679, in __init__
  File "/home/erik/lib/python2.7/subprocess.py", line 1224, in _execute_child
  File "/home/erik/lib/python2.7/pickle.py", line 1382, in loads
  File "/home/erik/lib/python2.7/pickle.py", line 858, in load
  File "/home/erik/lib/python2.7/pickle.py", line 971, in load_string
LookupError: unknown encoding: string-escape

Am I missing something here? does the chroot environment need to be populated with more than just the date executable in this case? I can't seem to find any examples of this & would appreciate any insight.  

Thanks,
Erik.


From ron3200 at gmail.com  Sun Sep  4 11:22:32 2011
From: ron3200 at gmail.com (ron3200)
Date: Sun, 04 Sep 2011 10:22:32 -0500
Subject: [Python-ideas] allow line break at operators
In-Reply-To: <87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRRh-kSoSjywrQH=jkeysPRwms6O376dPOyTqkZtdgG_jQ@mail.gmail.com>
	<mailman.2085.1312956463.1164.python-list@python.org>
	<4e424208$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.08.10.09.56.19@tombstonezero.net>
	<mailman.2096.1312971973.1164.python-list@python.org>
	<Xns9F3D8883BD21Aduncanbooth@127.0.0.1>
	<1312981104.89312.YahooMailNeo@web121520.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
	<87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>
Message-ID: <1315149752.24283.18.camel@Gutsy>

On Sat, 2011-09-03 at 13:38 +0900, Stephen J. Turnbull wrote:
> Guido van Rossum writes:
>  > On Fri, Sep 2, 2011 at 12:28 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:
> 
>  > > Sure, but IIRC one design principle of Python is that the keyword that
>  > > denotes the syntax should be the first thing on the line,
> [...]
>  > That's true for *statements* (except assignments and calls).
>  > 
>  > > Analogously, if operators are going to denote continuation, they
>  > > should come first on the line.
> 
>  > That doesn't follow.
> 
> Agreed, it's not a logical implication.  The analogy is only an
> analogy, but my eyes do work that way.
> 
> My conclusion is that we shouldn't try to encourage either style,
> because people "see" continuation differently.  Legislating a style
> isn't going to change that, I think.

I like to start continued lines with an operator as well.   I also think
it helps me keep it in my head a bit easier when I do that. 

I think this is one of those areas where computers and people differ,
but it may also depend on the persons native language as to what works
better for them.

Ron





From alain at dpt-info.u-strasbg.fr  Sun Sep  4 11:25:48 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sun, 04 Sep 2011 17:25:48 +0200
Subject: Can't use subprocess.Popen() after os.chroot() - why?
References: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>
Message-ID: <87zkikz5vn.fsf@dpt-info.u-strasbg.fr>

Erik <erik.williamson at gmail.com> writes:

> import os
> from subprocess import Popen, PIPE
>
> os.chroot("/tmp/my_chroot")
> p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
> stdout_val, stderr_val = p.communicate()
> print stdout_val
>
> but the Popen call is dying with the following exception:
>
> Traceback (most recent call last):
>   File "./test.py", line 7, in <module>
>     p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
>   File "/home/erik/lib/python2.7/subprocess.py", line 679, in __init__
>   File "/home/erik/lib/python2.7/subprocess.py", line 1224, in _execute_child
>   File "/home/erik/lib/python2.7/pickle.py", line 1382, in loads
>   File "/home/erik/lib/python2.7/pickle.py", line 858, in load
>   File "/home/erik/lib/python2.7/pickle.py", line 971, in load_string
> LookupError: unknown encoding: string-escape
>
> Am I missing something here? does the chroot environment need to be
> populated with more than just the date executable in this case?

Yes, because /bin/date is probably dynamically linked: you need the libs
as well. (Try first with a statically linked executable, e.g.,
/bin/busybox, and everything should be ok).

I agree the message is strange. For some reason, subprocess is calling
pickle.loads, which calls rep.decode("string-escape"), which probably
needs to access some file and fails because of the chroot().

I woud advise to use the chroot command instead of chrooting your python
process, if that's possible for you.

-- Alain.


From rantingrick at gmail.com  Sun Sep  4 12:37:00 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 09:37:00 -0700 (PDT)
Subject: allow line break at operators
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc! !
	0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315023501.31777.YahooMailNeo@web121514.mail.ne1.yahoo.com>
	<87aaamjgvh.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315036271.77996.YahooMailNeo@web121504.mail.ne1.yahoo.com>
	<878vq6j7og.fsf@uwakimon.sk.tsukuba.ac.jp>
	<1315046028.59053.YahooMailNeo@web121512.mail.ne1.yahoo.com>
	<mailman.737.1315068637.27778.python-list@python.org>
Message-ID: <b7d647f1-901b-4ab9-8fe1-eab1a3dae140@u6g2000yqa.googlegroups.com>

On Sep 3, 11:50?am, Stephen Hansen <me+list/pyt... at ixokai.io> wrote:

> Freedom is not and never has been, IMHO, a virtue or goal or even desire
> in Python.

Exactly!

> Where it occurs, it is at best a happy coincidence,

Exactly!

> and even
> if that happy coincidence happens often, it is not a design feature, IMHO.

Exactly! Actually i believe Python allows TOO many freedoms and
indulges TOO many excesses to the detriment of our code bases. Take
the fact that both tabs AND spaces are legal in Python source. We
should have choose one over the other!



From hansmu at xs4all.nl  Sun Sep  4 13:36:28 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Sun, 04 Sep 2011 19:36:28 +0200
Subject: Can't use subprocess.Popen() after os.chroot() - why?
In-Reply-To: <87zkikz5vn.fsf@dpt-info.u-strasbg.fr>
References: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>
	<87zkikz5vn.fsf@dpt-info.u-strasbg.fr>
Message-ID: <4e63b71c$0$2421$e4fe514c@news2.news.xs4all.nl>

On 4/09/11 17:25:48, Alain Ketterlin wrote:
> Erik<erik.williamson at gmail.com>  writes:
>
>> import os
>> from subprocess import Popen, PIPE
>>
>> os.chroot("/tmp/my_chroot")
>> p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
>> stdout_val, stderr_val = p.communicate()
>> print stdout_val
>>
>> but the Popen call is dying with the following exception:
>>
>> Traceback (most recent call last):
>>    File "./test.py", line 7, in<module>
>>      p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)
>>    File "/home/erik/lib/python2.7/subprocess.py", line 679, in __init__
>>    File "/home/erik/lib/python2.7/subprocess.py", line 1224, in _execute_child
>>    File "/home/erik/lib/python2.7/pickle.py", line 1382, in loads
>>    File "/home/erik/lib/python2.7/pickle.py", line 858, in load
>>    File "/home/erik/lib/python2.7/pickle.py", line 971, in load_string
>> LookupError: unknown encoding: string-escape
>>
>> Am I missing something here? does the chroot environment need to be
>> populated with more than just the date executable in this case?
>
> Yes, because /bin/date is probably dynamically linked: you need the libs
> as well. (Try first with a statically linked executable, e.g.,
> /bin/busybox, and everything should be ok).

/bin/date also needs timezone information from either /etc/localtime
or /usr/share/zoneinfo/ (depends on whether the environment variable
TZ is set).

It may need other data files as well (e.g. for localization).

> I agree the message is strange. For some reason, subprocess is calling
> pickle.loads, which calls rep.decode("string-escape"), which probably
> needs to access some file and fails because of the chroot().

The child process tries to exec /bin/date and fails.  The child process
then pickles the resulting exception and sends it to the parent via
a pipe that the parent has created for this purpose.  The parent then
tries to unpickle the exception and fails to find the string-escape
decoder in its usual place, due to the chroot.

If you fix that, then the parent process will be able to re-raise the
exception from the child process (which may or may not confuse you).

> I woud advise to use the chroot command instead of chrooting your python
> process, if that's possible for you.

You'll find you need to copy a lot of dynamic libraries and several
data files to your chroot box, before the normal commands in /bin work.

Keep in mind that the more features you copy to the chroot jail, the
easier it becomes to escape from it.

Hope this helps,

-- HansM


From rantingrick at gmail.com  Sun Sep  4 14:08:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 11:08:36 -0700 (PDT)
Subject: allow line break at operators
References: <1312951356.77394.YahooMailNeo@web121518.mail.ne1.yahoo.com>
	<1312982377.95657.YahooMailNeo@web121508.mail.ne1.yahoo.com>
	<CAPTjJmq6bBPpMHFM7DufWnD2Mo-NWinb-d6iTeSGtRW4D1fOiw@mail.gmail.com>
	<1313031175.38817.YahooMailNeo@web121515.mail.ne1.yahoo.com>
	<CAMZYqRQ+2_trqdffnGJjv=NdB1ZutD69=ZifDa_GqH5zvWuzQw@mail.gmail.com>
	<4E43D2F2.1090004@mrabarnett.plus.com>
	<CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com>
	<1314884634.78252.YahooMailNeo@web121507.mail.ne1.yahoo.com>
	<CAB4yi1MqV2mgXXkaCOQ3RThNGjR41BWJ9vGMfTxTq1v2h6edNQ@mail.gmail.com>
	<CAH3V-b7P+tQKZPz0MqLzapJ_eXm-oX1nKfxrqvQc0Z+yPbB4oA@mail.gmail.com>
	<877h5rjtdb.fsf@uwakimon.sk.tsukuba.ac.jp>
	<CAP7+vJK9+EZieD03t6p0W9kBGs3Z+mLMaORfWzjNde4BRbvapQ@mail.gmail.com>
	<87bov2jl54.fsf@uwakimon.sk.tsukuba.ac.jp>
	<mailman.760.1315156946.27778.python-list@python.org>
Message-ID: <af2323a6-f3cc-4a71-a704-466e40c44b8f@l7g2000vbz.googlegroups.com>

On Sep 4, 10:22?am, ron3200 <ron3... at gmail.com> wrote:

> I think this is one of those areas where computers and people differ,
> but it may also depend on the persons native language as to what works
> better for them.

Yes but what works better for "them" is not always a better way of
doing things! People do foolish things all the time just from pure
habit. A foolish consistency is a foolish consistency my friend. I
mean, look at the folks who popped their cherry writing Basic code;
talk about dysfunctional!


From tjreedy at udel.edu  Sun Sep  4 14:32:07 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 04 Sep 2011 14:32:07 -0400
Subject: Functions vs OOP
In-Reply-To: <tiobj8-sng.ln1@chris.zbmc.eu>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
	<tiobj8-sng.ln1@chris.zbmc.eu>
Message-ID: <j40g8p$33o$1@dough.gmane.org>

On 9/4/2011 4:13 AM, tinnews at isbd.co.uk wrote:
> Ian Kelly<ian.g.kelly at gmail.com>  wrote:

>> Functional programming is about using functions in the *mathematical*
>> sense.  A mathematical function maps one value (or tuple of values) to
>> another value.  The mapped value never varies; if it did, it would be
>> a different function.  So functional programming eschews the use of
>> functions where the results depend on any internal or external state
>> beyond the values of the passed-in arguments, such as the variable
>> state of the object the method is being called on.
>>
> I think there may be another issue here.  If someone says "functional
> programming" to me then I would generally assume that they *do* mean
> "programming using functions".  While your distinction of the two may
> be strictly correct I don't think it's the generally accepted meaning.

The distintion drawn by Ian *is* generally accepted in computer science. See
https://secure.wikimedia.org/wikipedia/en/wiki/Functional_programming
For instance, programming is C is imperative programming with functions 
but it generally is not 'functional programming' in the sense referred 
to by Ian and the Wikipedia article. Given that our docs are written by 
people who do understand the technical distinction, you are probably 
wrong to assume otherwise.

However, as I said to William, it is possible that our docs could be 
improved so as to not depend on all readers having prior knowledge of 
the intended meaning of 'functional programming'. As the use of Python 
has expanded, so has the variety of backgrounds of Python programmers.

-- 
Terry Jan Reedy



From PointedEars at web.de  Sun Sep  4 14:35:02 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Sun, 04 Sep 2011 20:35:02 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
	<6545843.yvFAXZvWTv@PointedEars.de>
	<9c528rFi5aU1@mid.individual.net>
	<4761603.ypaU67uLZW@PointedEars.de>
	<9c6d4cFa54U1@mid.individual.net>
	<109595831.VCN276Cjj6@PointedEars.de>
	<9cgsvvFdhuU1@mid.individual.net>
Message-ID: <1536106.qVoOGUtdWV@PointedEars.de>

Fokke Nauta wrote:

> "Thomas 'PointedEars' Lahn" <PointedEars at web.de> wrote in message
> news:109595831.VCN276Cjj6 at PointedEars.de...
> 
> <cut>
> 
> If you don't have anything better to contribute, please stop answering.
> 
> Es gen?gt schon.

I should have expected as much from an address munger.

*plonk*

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From bkasterm at gmail.com  Sun Sep  4 15:39:49 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Sun, 04 Sep 2011 13:39:49 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
Message-ID: <87obz0w0ze.fsf@gmail.com>

rantingrick <rantingrick at gmail.com> writes:

> On Sep 3, 5:15?pm, Bart Kastermans <bkast... at gmail.com> wrote:
>
>> Any suggestions?
>
> Yeah, have you considered using the "linespace()" method of tk.Font
> objects to calculate the height? Although i must say it "feels" as if
> your doing something you should not need to do, however i cannot be
> sure without knowing more about this GUI. Sounds a lot like trying to
> put socks on a rooster.
>
> http://infohost.nmt.edu/tcc/help/pubs/tkinter/std-attrs.html#fonts

Thx.  That function should allow for a bit of robustness.

I get bits of information over RSS, these are of varying length.  I
want to show 10 at a time, and scroll through them.  Now when I
scroll the window grows and shrinks depending on their size, I want
to right from the start make it high enough to contain even the
biggest that will have to be shown.  So the question is determining
the height parameter for the labels ahead of time.  My strategy has
been to put all in labels and then try to get the information from
the label of how high it needs to be made at a certain width.


From nospam at domain.invalid  Sun Sep  4 15:43:31 2011
From: nospam at domain.invalid (William Gill)
Date: Sun, 04 Sep 2011 15:43:31 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.761.1315161191.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>	<mailman.743.1315075846.27778.python-list@python.org>	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
Message-ID: <j40kd8$du4$1@dont-email.me>

On 9/4/2011 2:32 PM, Terry Reedy wrote:
> On 9/4/2011 4:13 AM, tinnews at isbd.co.uk wrote:
>> Ian Kelly<ian.g.kelly at gmail.com> wrote:
>
>>> Functional programming is about using functions in the *mathematical*
>>> sense. A mathematical function maps one value (or tuple of values) to
>>> another value. The mapped value never varies; if it did, it would be
>>> a different function. So functional programming eschews the use of
>>> functions where the results depend on any internal or external state
>>> beyond the values of the passed-in arguments, such as the variable
>>> state of the object the method is being called on.
>>>
>> I think there may be another issue here. If someone says "functional
>> programming" to me then I would generally assume that they *do* mean
>> "programming using functions". While your distinction of the two may
>> be strictly correct I don't think it's the generally accepted meaning.
>
> The distintion drawn by Ian *is* generally accepted in computer science.
> See
> https://secure.wikimedia.org/wikipedia/en/wiki/Functional_programming
> For instance, programming is C is imperative programming with functions
> but it generally is not 'functional programming' in the sense referred
> to by Ian and the Wikipedia article. Given that our docs are written by
> people who do understand the technical distinction, you are probably
> wrong to assume otherwise.
>
> However, as I said to William, it is possible that our docs could be
> improved so as to not depend on all readers having prior knowledge of
> the intended meaning of 'functional programming'. As the use of Python
> has expanded, so has the variety of backgrounds of Python programmers.
>
Since I am the one who opened this can of worms, and since I believe I 
have relocated the document that I misinterpreted,  I feel compelled to 
jump in here.

The source of my error is "Functional Programming HOWTO 
(/python-3.1.3-docs-html/howto/functional.html)"

Having arrived at this page indirectly (searching for and skimming other 
information regarding functions and methods) I was only half paying 
attention.  As a result I made the same mistake Chris did.

As a point of reference, I would not call myself a programmer, and any 
formal exposure was many, many years ago.  I am familiar with the 
concepts of procedural, declarative, and object-oriented programming, 
but not functional.  At least not in this context.

Having done a little more digging I now understand the difference. 
"Functional programming" is the proper terminology, and had I come 
across it from another direction, or with a more deliberate focus I 
probably wouldn't have made the initial mistake.

If you read the material with even a nominal understanding of the 
functional paradigm (functional relationships in a mathematical sense, 
not functions in the procedural sense), it is clear.  If you read it 
without consciously recognizing this difference, the material does 
nothing to alert you to the initial error.






From georg at python.org  Sun Sep  4 16:21:50 2011
From: georg at python.org (Georg Brandl)
Date: Sun, 04 Sep 2011 22:21:50 +0200
Subject: [RELEASED] Python 3.2.2
Message-ID: <4E63DDDE.2040108@python.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On behalf of the Python development team, I'm happy to announce the
Python 3.2.2 maintenance release.

Python 3.2.2 mainly fixes `a regression <http://bugs.python.org/12576>`_ in the
``urllib.request`` module that prevented opening many HTTP resources correctly
with Python 3.2.1.

Python 3.2 is a continuation of the efforts to improve and stabilize the
Python 3.x line.  Since the final release of Python 2.7, the 2.x line
will only receive bugfixes, and new features are developed for 3.x only.

Since PEP 3003, the Moratorium on Language Changes, is in effect, there
are no changes in Python's syntax and built-in types in Python 3.2.
Development efforts concentrated on the standard library and support for
porting code to Python 3.  Highlights are:

* numerous improvements to the unittest module
* PEP 3147, support for .pyc repository directories
* PEP 3149, support for version tagged dynamic libraries
* PEP 3148, a new futures library for concurrent programming
* PEP 384, a stable ABI for extension modules
* PEP 391, dictionary-based logging configuration
* an overhauled GIL implementation that reduces contention
* an extended email package that handles bytes messages
* a much improved ssl module with support for SSL contexts and certificate
  hostname matching
* a sysconfig module to access configuration information
* additions to the shutil module, among them archive file support
* many enhancements to configparser, among them mapping protocol support
* improvements to pdb, the Python debugger
* countless fixes regarding bytes/string issues; among them full support
  for a bytes environment (filenames, environment variables)
* many consistency and behavior fixes for numeric operations

For a more extensive list of changes in 3.2, see

    http://docs.python.org/3.2/whatsnew/3.2.html

To download Python 3.2 visit:

    http://www.python.org/download/releases/3.2/

Please consider trying Python 3.2 with your code and reporting any bugs
you may notice to:

    http://bugs.python.org/


Enjoy!

- --
Georg Brandl, Release Manager
georg at python.org
(on behalf of the entire python-dev team and 3.2's contributors)
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.18 (GNU/Linux)

iEYEARECAAYFAk5j3d4ACgkQN9GcIYhpnLA2BACeLZ8nSdVOoxlJw4DnbM42neeA
fwAAoKTHetXsVxrEfvCWSorUhoJ083kZ
=5Wm1
-----END PGP SIGNATURE-----


From rantingrick at gmail.com  Sun Sep  4 17:10:59 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 14:10:59 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
Message-ID: <8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>

On Sep 4, 2:39?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> I get bits of information over RSS, these are of varying length. ?I
> want to show 10 at a time, and scroll through them. ?Now when I
> scroll the window grows and shrinks depending on their size, I want
> to right from the start make it high enough to contain even the
> biggest that will have to be shown. ?So the question is determining
> the height parameter for the labels ahead of time. ?My strategy has
> been to put all in labels and then try to get the information from
> the label of how high it needs to be made at a certain width.

I see. However i might opt instead for a text widget with columns of
wrapped text. You could use the textwrap.py module to help (although
you'll have to work around it's shortcomings for paragraphs and such).
In any event it's difficult to offer good advice without seeing the
code directly.




From rantingrick at gmail.com  Sun Sep  4 17:15:07 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 4 Sep 2011 14:15:07 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
Message-ID: <d9f70fa4-da45-445c-b976-824c92ea8de0@s12g2000yqm.googlegroups.com>

On Sep 4, 2:39?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> Thx. ?That function should allow for a bit of robustness.

Correction. The function is actually "tkFont.metrics(arg)" which takes
"linespace" as an optional argument.


From exarkun at twistedmatrix.com  Sun Sep  4 17:26:01 2011
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sun, 04 Sep 2011 21:26:01 -0000
Subject: pyOpenSSL 0.13 release
Message-ID: <20110904212601.1808.1179874796.divmod.xquotient.244@localhost.localdomain>

Hello all,

I'm happy to announce the release of pyOpenSSL 0.13.  With this release, 
pyOpenSSL now supports OpenSSL 1.0.  Additionally, pyOpenSSL now works 
with PyPy.

Apart from those two major developments, the following interesting 
changes have been made since the last release:

  * (S)erver (N)ame (I)ndication is now supported.
  * There are now APIs with which the underlying OpenSSL version can be 
queried.
  * The peer's certificate chain for a connection can now be inspected.
  * New methods have been added to PKey and X509 objects exposing more 
OpenSSL functionality.

Release files are available on PyPI.  The latest development version and 
the issue tracker can be found on Launchpad.

Jean-Paul


From steve+comp.lang.python at pearwood.info  Sun Sep  4 19:41:42 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 05 Sep 2011 09:41:42 +1000
Subject: Functions vs OOP
References: <j3tjov$c30$1@dont-email.me>	<mailman.743.1315075846.27778.python-list@python.org>	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
	<j40kd8$du4$1@dont-email.me>
Message-ID: <4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>

William Gill wrote:

> The source of my error is "Functional Programming HOWTO
> (/python-3.1.3-docs-html/howto/functional.html)"

For those who don't have access to William's local file system, I expect
he's looking at this:

http://docs.python.org/release/3.1.3/howto/functional.html

or the most recent version:

http://docs.python.org/dev/howto/functional.html


[...]
> If you read the material with even a nominal understanding of the
> functional paradigm (functional relationships in a mathematical sense,
> not functions in the procedural sense), it is clear.  If you read it
> without consciously recognizing this difference, the material does
> nothing to alert you to the initial error.

What about the entire "Introduction" section, which starts with this
statement?

"This section explains the basic concept of functional programming"

If you would like to suggest improvements, please do so.




-- 
Steven



From nospam at domain.invalid  Sun Sep  4 20:46:19 2011
From: nospam at domain.invalid (William Gill)
Date: Sun, 04 Sep 2011 20:46:19 -0400
Subject: Functions vs OOP
In-Reply-To: <4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>	<mailman.743.1315075846.27778.python-list@python.org>	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
	<j40kd8$du4$1@dont-email.me>
	<4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j41651$bck$1@dont-email.me>

On 9/4/2011 7:41 PM, Steven D'Aprano wrote:
> William Gill wrote:
>
>> The source of my error is "Functional Programming HOWTO
>> (/python-3.1.3-docs-html/howto/functional.html)"
>
> For those who don't have access to William's local file system, I expect
> he's looking at this:
>
> http://docs.python.org/release/3.1.3/howto/functional.html
>
> or the most recent version:
>
> http://docs.python.org/dev/howto/functional.html

I didn't expect anyone to access my file system so I trimmed the path, 
but left enough for an industrious soul like yourself to figure it out. 
  You did, so it seems I was correct, or do you think "functional.html" 
would have been sufficient? ;-)

>
> [...]
>> If you read the material with even a nominal understanding of the
>> functional paradigm (functional relationships in a mathematical sense,
>> not functions in the procedural sense), it is clear.  If you read it
>> without consciously recognizing this difference, the material does
>> nothing to alert you to the initial error.
>
> What about the entire "Introduction" section, which starts with this
> statement?
>
> "This section explains the basic concept of functional programming"

Which clears up the misunderstanding, how?  Unless the target audience 
is people who already understands "the basic concept of functional 
programming."  That seems like a circular reference.

The article is introducing a concept.  To assume any familiarity with 
that concept as a basis, is not an introduction.

As previously stated; I was already familiar with the concepts of 
procedural, declarative, and object-oriented programming, but not 
functional programming.  Nothing I read (I'll be honest; scanned) did 
anything to contradict my incorrect point of reference.

> If you would like to suggest improvements, please do so.

How about a caveat stating something like "NOTE: functional as in 
mathematical functions, not to be confused with functions/procedures."




From rosuav at gmail.com  Sun Sep  4 20:59:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 5 Sep 2011 10:59:59 +1000
Subject: Functions vs OOP
In-Reply-To: <4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>
	<mailman.743.1315075846.27778.python-list@python.org>
	<tiobj8-sng.ln1@chris.zbmc.eu>
	<mailman.761.1315161191.27778.python-list@python.org>
	<j40kd8$du4$1@dont-email.me>
	<4e640cb7$0$30003$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmq7y6J-F82HuwXDy-eZwK20Pz7aQqSMO50m8K6K_=wu-A@mail.gmail.com>

On Mon, Sep 5, 2011 at 9:41 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> http://docs.python.org/dev/howto/functional.html
>
> What about the entire "Introduction" section, which starts with this
> statement?
>
> "This section explains the basic concept of functional programming"
>
> If you would like to suggest improvements, please do so.

Well, it does invite you to skip that whole section :)

Since you asked, though, the copyeditor in me does want to suggest one
small tweak:

Second paragraph after the bullet list ends "Avoiding side effects
means not using data structures that get updated as a program runs;
every function?s output must only depend on its input." - I'd word it
as "must depend only on". Pretty immaterial, but the formal style
prefers correctness.

Somewhat more significant: Under "Modularity", may be of value to add
a paragraph about parallelism.

With functional code, it's easy for an interpreter to ascertain which
functions depend on each other (because one's return value is
another's input). Independent functions can be run in parallel without
affecting the result; the interpreter can therefore divide a complex
task across multiple CPUs without any work from the programmer.

Like I said, it's just "since you asked". :) The above paragraph is
hereby given out as public domain, use it (edit it, whatever) under
whatever license the Python docs require.

ChrisA


From simoncropper at fossworkflowguides.com  Mon Sep  5 01:18:30 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 15:18:30 +1000
Subject: Hello, and request for help with 'dynamic grids'
Message-ID: <4E645BA6.4070500@fossworkflowguides.com>

Hi,

I am a applications developer - originally from Windows using primarily 
Visual Foxpro, although I am familiar with a variety of other xbase 
derivatives. I now use Linux / Ubuntu, and have been actively teaching 
myself Python with the view to migrate most of my applications to 
sqlite-based database.

I am looking for the ability to create dynamic grids in a window but 
can't for the life of me find how to do this.

Here is the functionality that I desire...
1. Have a dialog appear that allows me to select a database, e.g. 
sqlite3 database.
2. Select table in the database and have all the records appear in a 
grid. Fields represented as column, width and order adjustable, rows 
representing records. Each cell can be edited directly.
3. I would like to create filters on this grid based on attributes in 
the table. So if the table is a list of names, filter and show only 
those people with a particular first name. For people familiar with 
xbase languages it equivalent to browsing a table and applying a filter.
4. Once the record is identified I would like to select the record or 
hit enter to have the data sent to the keyboard buffer or put into the 
clipboard.

I have found most of these elements available. I can create dialogs, I 
can connect to a database, I can extract data from the tables using SQL 
but I can't find how to easily get these lists into a grid -- it appears 
to me you need to allocate list record 1 to grid row 1, list record 2 to 
grid row 2, etc and manage how many rows are displayed and 'page' 
through the table.

Am I missing something? I presume that you could just supply a list or 
array selected using SQL from a table and just pass this data to a grid 
and have it manage all the basics like if the window is resized the 
number of rows and columns are adjusted accordingly, buffering records, etc.

My investigations have generally found that windows/forms/data entry 
screen can be created for a specific table or view, but these are 
hard-wired during development. Is there anyway of rapidly defining the 
grid during runtime so any table can be viewed?

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From krille012 at gmail.com  Mon Sep  5 02:47:42 2011
From: krille012 at gmail.com (=?ISO-8859-1?Q?Kristofer_Tengstr=F6m?=)
Date: Sun, 4 Sep 2011 23:47:42 -0700 (PDT)
Subject: Need help with simple OOP Python question
Message-ID: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>

Hi, I'm having trouble creating objects that in turn can have custom
objects as variables. The code looks like this:

---------------------------------------------

class A:
    sub = dict()
    def sub_add(self, cls):
        obj = cls()
        self.sub[obj.id] = obj

class B(A):
    id = 'inst'

base = A()
base.sub_add(B)
base.sub['inst'].sub_add(B)

print # prints a blank line
print base.sub['inst']
print base.sub['inst'].sub['inst']

----------------------------------------------

Now, what I get from this is the following:
<__main__.B instance at 0x01FC20A8>
<__main__.B instance at 0x01FC20A8>
Why is this? What I want is for them to be two separate objects, but
it seems like they are the same one. I've tried very hard to get this
to work, but as I've been unsuccessful I would really appreciate some
comments on this. I'm sure it's something really easy that I just
haven't thought of.

Python version is 2.6.5 (I'm using Panda3D to create a 2?D game).


From me+list/python at ixokai.io  Mon Sep  5 03:07:45 2011
From: me+list/python at ixokai.io (Stephen Hansen)
Date: Mon, 05 Sep 2011 00:07:45 -0700
Subject: Need help with simple OOP Python question
In-Reply-To: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <4E647541.7080304@ixokai.io>

On 9/4/11 11:47 PM, Kristofer Tengstr?m wrote:
> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables. The code looks like this:
> 
> ---------------------------------------------
> 
> class A:
>     sub = dict()

You are sharing this single "sub" dictionary with all instances of your
A class.

If you want to define instance-specific attributes, define them in the
__init__ method, like so:

class A:
    def __init__(self):
        self.sub = dict()

    def sub_add(self, cls):
        obj = cls()
        self.sub[obj.id] = obj

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

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From __peter__ at web.de  Mon Sep  5 03:10:14 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 05 Sep 2011 09:10:14 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <j41skh$mv7$1@dough.gmane.org>

Kristofer Tengstr?m wrote:

> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables. The code looks like this:
> 
> ---------------------------------------------
> 
> class A:
>     sub = dict()

Putting it into the class like this means sub is shared by all instances.

>     def sub_add(self, cls):
>         obj = cls()
>         self.sub[obj.id] = obj
> 
> class B(A):
>     id = 'inst'
> 
> base = A()
> base.sub_add(B)
> base.sub['inst'].sub_add(B)
> 
> print # prints a blank line
> print base.sub['inst']
> print base.sub['inst'].sub['inst']
> 
> ----------------------------------------------
> 
> Now, what I get from this is the following:
> <__main__.B instance at 0x01FC20A8>
> <__main__.B instance at 0x01FC20A8>
> Why is this? What I want is for them to be two separate objects, but
> it seems like they are the same one. I've tried very hard to get this
> to work, but as I've been unsuccessful I would really appreciate some
> comments on this. I'm sure it's something really easy that I just
> haven't thought of.

Your class A needs an initialiser:

class A:
    def __init__(self):
        self.sub = {} # one dict per instance
    # ...



From steve+comp.lang.python at pearwood.info  Mon Sep  5 03:19:12 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 05 Sep 2011 17:19:12 +1000
Subject: Hello, and request for help with 'dynamic grids'
References: <mailman.765.1315202654.27778.python-list@python.org>
Message-ID: <4e6477f0$0$29981$c3e8da3$5496439d@news.astraweb.com>

On Mon, 5 Sep 2011 03:18 pm Simon Cropper wrote:

> I am looking for the ability to create dynamic grids in a window but
> can't for the life of me find how to do this.

What GUI toolkit are you using?


-- 
Steven



From ben+python at benfinney.id.au  Mon Sep  5 03:26:51 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 05 Sep 2011 17:26:51 +1000
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <87sjobo3es.fsf@benfinney.id.au>

Kristofer Tengstr?m <krille012 at gmail.com> writes:

> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables.

That terminology is rather confused.

I think what you want is to have instances with their own attributes.

> class A:
>     sub = dict()

This binds a single object (a new empty dict) to the class attribute
?sub?. Every instance of class ?A? will share the same attribute, and
hence that same dict.

>     def sub_add(self, cls):

This defines a function which will be bound to the class attribute
?sub_add?. It will, when later called as a method, receive the instance
as the first parameter, bound to the local name ?self?.

>         obj = cls()
>         self.sub[obj.id] = obj

Here, ?self? will be an instance of the ?A? class. Each instance has no
?sub? attribute, so Python will find the class attribute ?A.sub?, shared
by all ?A? instances. You're then modifying that class attribute ?A.sub?.

[?]

> Now, what I get from this is the following:
> <__main__.B instance at 0x01FC20A8>
> <__main__.B instance at 0x01FC20A8>
> Why is this?

I hope the above explains it.

> What I want is for them to be two separate objects, but it seems like
> they are the same one.

Yes. Anything you talk about in the class definition scope cannot know
about any instance of that class, since the instances don't exist yet.

Instead, instance attributes need to be bound to a particular instance,
which means you need to have a reference to the instance; that's what
?self? is for. The class initialiser is a method named ?__init__?, and
is called on each newly-created instance before that instance is
returned from the constructor.

I advise you to work through the Python tutorial, beginning to end,
which will give you a good grounding in these and other fundamental
Python topics <URL:http://docs.python.org/tutorial/>. Work through each
example, understand it by experimenting, and then proceed to the next,
until you've done the lot.

-- 
 \         ?If history and science have taught us anything, it is that |
  `\     passion and desire are not the same as truth.? ?E. O. Wilson, |
_o__)                                              _Consilience_, 1998 |
Ben Finney


From bex.lewis at gmail.com  Mon Sep  5 05:01:05 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Mon, 5 Sep 2011 02:01:05 -0700 (PDT)
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
Message-ID: <a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>

>
> > Possibly.
> > I tried this:
> > server.py -n -c config.ini
> > Once again, the server is up and running and when I am logging in with my
> > browser (10.0.0.140:8081) I can see information showing up at the command
> > prompt, showing somebody is logging is, but the same error:
> > "fshandler:get_data: \Webdav not found". During starting up the server
> > mentioned: "pywebdav:Serving data from \Webdav".
>
> > In the config file it says:
> > "# main directory
> > directory = \Webdav"
>
> > Perhaps my Python configuration is at fault.
>
> > Fokke
>
> Is the path supposed to be absolute? In which case you'd need to have:
> directory=C:\path\to\Webdav
>
> instead of just
> directory=\Webdav
>
> I tried:
> directory=D:\Webdav
> directory=D:/Webdav
>
> To no avail.
> It didn.t make any difference.
>
> I surely believe my WebDAV installation is at fault.
>
> Fokke

Interestingly, looking at the code that returns the
"fshandler:get_data: \Webdav not found" message, it looks like it
tests that the path given exists and then tries an os.path.isfile,
then an os.path.isdir. If both fail you get the message that you see.
This might be a bit of a shot in the dark but could you try the path
with and without a trailing '/' or '\'? I don't currently have a
windows box available to test on and figure out why it would be
detected as existing but not test true for either a file or directory.

Becky Lewis


From hnsri49 at gmail.com  Mon Sep  5 05:34:22 2011
From: hnsri49 at gmail.com (srinivas hn)
Date: Mon, 5 Sep 2011 15:04:22 +0530
Subject: Need help with simple OOP Python question
In-Reply-To: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
Message-ID: <CAG5_3td1a_CB9p0EUXZLM8_ZZ3ie57aHvH1Kjn3apKvB2t0ouw@mail.gmail.com>

Hi,
You are getting same object because you are overriding the dictionary
update.
Its printing the proper value with the last updated instance of B.

If you want to see the two different instances of class B give print
self.sub inside the sub_add method in class A.

CHEERS
CNA
9986229891


On Mon, Sep 5, 2011 at 12:17 PM, Kristofer Tengstr?m <krille012 at gmail.com>wrote:

> Hi, I'm having trouble creating objects that in turn can have custom
> objects as variables. The code looks like this:
>
> ---------------------------------------------
>
> class A:
>    sub = dict()
>    def sub_add(self, cls):
>        obj = cls()
>        self.sub[obj.id] = obj
>
> class B(A):
>    id = 'inst'
>
> base = A()
> base.sub_add(B)
> base.sub['inst'].sub_add(B)
>
> print # prints a blank line
> print base.sub['inst']
> print base.sub['inst'].sub['inst']
>
> ----------------------------------------------
>
> Now, what I get from this is the following:
> <__main__.B instance at 0x01FC20A8>
> <__main__.B instance at 0x01FC20A8>
> Why is this? What I want is for them to be two separate objects, but
> it seems like they are the same one. I've tried very hard to get this
> to work, but as I've been unsuccessful I would really appreciate some
> comments on this. I'm sure it's something really easy that I just
> haven't thought of.
>
> Python version is 2.6.5 (I'm using Panda3D to create a 2?D game).
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From simoncropper at fossworkflowguides.com  Mon Sep  5 06:07:05 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 20:07:05 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4e6477f0$0$29981$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.765.1315202654.27778.python-list@python.org>
	<4e6477f0$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E649F49.5050103@fossworkflowguides.com>

On 05/09/11 17:19, Steven D'Aprano wrote:
> On Mon, 5 Sep 2011 03:18 pm Simon Cropper wrote:
>
>> I am looking for the ability to create dynamic grids in a window but
>> can't for the life of me find how to do this.
>
> What GUI toolkit are you using?
>
>

I have looked at wxGlade, Boa Constructor, wxFormBuilder, tkinder, I 
have also looked through the Python website many times looking for 
commands that would allow me to create a GUI from scratch.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From t at jollybox.de  Mon Sep  5 06:40:07 2011
From: t at jollybox.de (Thomas Jollans)
Date: Mon, 05 Sep 2011 12:40:07 +0200
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4E645BA6.4070500@fossworkflowguides.com>
References: <4E645BA6.4070500@fossworkflowguides.com>
Message-ID: <4E64A707.9090006@jollybox.de>

On 05/09/11 07:18, Simon Cropper wrote:
> I am looking for the ability to create dynamic grids in a window but
> can't for the life of me find how to do this.

It depends on which windowing toolkit you're planning to use. If you use
PyGTK, you'd want a TreeView widget to display the list. Fill a
ListStore instance with your data and give that to the TreeView. You can
implement filtering and sorting on top of that using TreeModelFilter and
TreeModelSort.

LibreOffice and OpenOffice have database management components (I
haven't used them, I assume they're somewhat similar to MS Access) - and
they can be scripted using Python. Depending on what you're doing, and
what you're planning to do in the future (re learning investment), that
might be worth looking into.

Thomas


From simoncropper at fossworkflowguides.com  Mon Sep  5 06:52:40 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 20:52:40 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4E64A707.9090006@jollybox.de>
References: <4E645BA6.4070500@fossworkflowguides.com>
	<4E64A707.9090006@jollybox.de>
Message-ID: <4E64A9F8.3000501@fossworkflowguides.com>

On 05/09/11 20:40, Thomas Jollans wrote:
> It depends on which windowing toolkit you're planning to use. If you use
> PyGTK, you'd want a TreeView widget to display the list. Fill a
> ListStore instance with your data and give that to the TreeView. You can
> implement filtering and sorting on top of that using TreeModelFilter and
> TreeModelSort.

I have look at most. I have no preference.

Are you able to point me to some resource material explaining how this 
can be done - e.g. a tutorial or manual?

> LibreOffice and OpenOffice have database management components (I
> haven't used them, I assume they're somewhat similar to MS Access) - and
> they can be scripted using Python. Depending on what you're doing, and
> what you're planning to do in the future (re learning investment), that
> might be worth looking into.

'Base' is of no value in this regard. It is not really designed for this 
and there is a raging debate at the moment whether it will be maintained 
in the future. It also fails in that it requires predefined connections 
and forms to be established. It would not be possible to dynamically 
link to a table in a database (I have established ODBC links to a SQLite 
database, but the driver is an un-maintained draft). I also believe that 
the 'base' component in libreoffice/openoffice is a java implementation 
not python.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From krille012 at gmail.com  Mon Sep  5 09:15:40 2011
From: krille012 at gmail.com (=?ISO-8859-1?Q?Kristofer_Tengstr=F6m?=)
Date: Mon, 5 Sep 2011 06:15:40 -0700 (PDT)
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
Message-ID: <93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>

Thanks everyone, moving the declaration to the class's __init__ method
did the trick. Now there's just one little problem left. I'm trying to
create a list that holds the parents for each instance in the
hierarchy. This is what my code looks like now:

-----------------------------------------

class A:
    def __init__(self, parents=None):
        self.sub = dict()
        if parents:
            self.parents = parents
        else:
            self.parents = []
    def sub_add(self, cls):
        hierarchy = self.parents
        hierarchy.append(self)
        obj = cls(hierarchy)
        self.sub[obj.id] = obj

class B(A):
    id = 'inst'

base = A()
base.sub_add(B)
base.sub['inst'].sub_add(B)

print
print vars(base)
print
print vars(base.sub['inst'])
print
print vars(base.sub['inst'].sub['inst'])

---------------------------------------------

The output from this program is the following:

{'parents': [<__main__.A instance at 0x02179468>, <__main__.B instance
at 0x021794B8>], 'sub': {'inst': <__main__.B instance at 0x021794B8>}}

{'parents': [<__main__.A instance at 0x02179468>, <__main__.B instance
at 0x021794B8>], 'sub': {'inst': <__main__.B instance at 0x021794E0>}}

{'parents': [<__main__.A instance at 0x02179468>, <__main__.B instance
at 0x021794B8>], 'sub': {}}

As you can see, the problem looks similar to the one before: All the
instances have an identical parent list. However, I don't understand
why as self.parents is declared in the __init__ method. Any ideas?
What I want is for the first instance to have an empty list, the
second to have one element in the list and the third to have two
parent elements.


From python at bdurham.com  Mon Sep  5 09:23:51 2011
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 05 Sep 2011 09:23:51 -0400
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <4E645BA6.4070500@fossworkflowguides.com>
References: <4E645BA6.4070500@fossworkflowguides.com>
Message-ID: <1315229031.32028.140258137504765@webmail.messagingengine.com>

Hi Simon,

> I am a applications developer - originally from Windows using primarily 
Visual Foxpro, although I am familiar with a variety of other xbase 
derivatives. 

Check out dabodev.com. Dabo is a Python framework created by former VFP
developers.

Highly recommended.

Malcolm


From simoncropper at fossworkflowguides.com  Mon Sep  5 09:33:31 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Mon, 05 Sep 2011 23:33:31 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <1315229031.32028.140258137504765@webmail.messagingengine.com>
References: <4E645BA6.4070500@fossworkflowguides.com>
	<1315229031.32028.140258137504765@webmail.messagingengine.com>
Message-ID: <4E64CFAB.70804@fossworkflowguides.com>

On 05/09/11 23:23, python at bdurham.com wrote:
> Check out dabodev.com. Dabo is a Python framework created by former VFP
> developers.
>

Dabo is a great product. Spoke extensively with Ed Leafe and Paul 
McNett. Unfortunately the framework is not 'dynamic'. If you have an 
fixed database and tables it can quite quickly create a basic data entry 
setup and menu. Looks great when it runs. The problem is creating the 
window and grid on the fly.

I want a program that can be used to open any database and 'data mine' 
and extract table content. Dabo allows RAD for an established relational 
databases not unknown ones.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From piet at vanoostrum.org  Mon Sep  5 10:15:01 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Mon, 05 Sep 2011 16:15:01 +0200
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<4e5e5628$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<j3m4pg01enu@news4.newsguy.com>
Message-ID: <m2wrdnf53u.fsf@cochabamba.vanoostrum.org>

Chris Torek <nospam at torek.net> writes:

[snip]
> Instead, we have a syntax where you, the programmer, write out the
> name of the local variable that binds to the first parameter.  This
> means the first parameter is visible.  Except, it is only visible
> at the function definition -- when you have the instance and call
> the instance or class method:
>
>     black_knight = K()
>     black_knight.meth1('a', 1)
>     black_knight.meth2(2)
>
> the first parameters (black_knight, and black_knight.__class__,
> respectively) are magic, and invisible.
>
> Thus, Python is using the "explicit is better than implicit" rule
> in the definition, but not at the call site.  I have no problem with
> this.  Sometimes I think implicit is better than explicit.  In this
> case, there is no need to distinguish, at the calls to meth1() and
> meth2(), as to whether they are "class" or "instance" methods.  At
> the *calls* they would just be distractions.

It *is* explicit also at the call site. It only is written at the left of the dot rather than at the right of the parenthesis. And that is necessary to locate which definition of the method applies. It would be silly to repeat this information after the parenthesis. Not only silly, it would be stupid as it would be a source of errors, and an example of DRY.
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From piet at vanoostrum.org  Mon Sep  5 10:23:24 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Mon, 05 Sep 2011 16:23:24 +0200
Subject: Closures and Partial Function Application
References: <9cd48486-acd9-4888-9677-0e54fd1eedfd@k15g2000yqd.googlegroups.com>
Message-ID: <m2sjobf4pv.fsf@cochabamba.vanoostrum.org>

Travis Parks <jehugaleahsa at gmail.com> writes:

> I also like partial function application. What is the easiest way of
> achieving this in Python? Would it look something like this:
>
> def foo(x, y):
>     return x + y
>
> xFoo = lambda y: foo(10, y)

from functools import partial
xfoo = partial(foo, 10)
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From wuwei23 at gmail.com  Mon Sep  5 10:40:15 2011
From: wuwei23 at gmail.com (alex23)
Date: Mon, 5 Sep 2011 07:40:15 -0700 (PDT)
Subject: Hello, and request for help with 'dynamic grids'
References: <mailman.765.1315202654.27778.python-list@python.org>
Message-ID: <624f5caf-e3c1-4a88-9861-606f7e2705e8@x14g2000prn.googlegroups.com>

On Sep 5, 3:18?pm, Simon Cropper <simoncrop... at fossworkflowguides.com>
wrote:
> My investigations have generally found that windows/forms/data entry
> screen can be created for a specific table or view, but these are
> hard-wired during development. Is there anyway of rapidly defining the
> grid during runtime so any table can be viewed?

The commercial product Resolver One provides a grid/spreadsheet style
interface with Python scripting capabilities. I'm not sure of its
current licensing status but I believe it used to be free if used on
open source projects.

http://www.resolversystems.com/products/resolver-one/

Each spreadsheet itself is Python code; I think it should be quite do-
able to take something with introspective SQL capabilities like
SQLAlchemy and have it title columns and fill them with the correct
fields accordingly.

Hope this helps.




From __peter__ at web.de  Mon Sep  5 10:43:02 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 05 Sep 2011 16:43:02 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
Message-ID: <j42n5g$qm5$1@solani.org>

Kristofer Tengstr?m wrote:

> Thanks everyone, moving the declaration to the class's __init__ method
> did the trick. Now there's just one little problem left. I'm trying to
> create a list that holds the parents for each instance in the
> hierarchy. This is what my code looks like now:
> 
> -----------------------------------------
> 
> class A:
>     def __init__(self, parents=None):
>         self.sub = dict()
>         if parents:

You should explicitly test for None here; otherwise in a call like

ancestors = []
a = A(anchestors)

the list passed as an argument will not be used, which makes fore confusing 
behaviour.

>             self.parents = parents
>         else:
>             self.parents = []
>     def sub_add(self, cls):
>         hierarchy = self.parents
>         hierarchy.append(self)

Here you are adding self to the parents (that should be called ancestors) 
and pass it on to cls(...). Then -- because it's non-empty -- it will be 
used by the child, too, and you end up with a single parents list.

>         obj = cls(hierarchy)
>         self.sub[obj.id] = obj

While the minimal fix is to pass a copy

def sub_add(self, cls):
    obj = cls(self.parents + [self])
    self.sub[obj.id] = obj

I suggest that you modify your node class to keep track only of the direct 
parent instead of all ancestors. That makes the implementation more robust 
when you move a node to another parent.



From fnautaNO at SPAMsolfon.nl  Mon Sep  5 10:51:00 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Mon, 5 Sep 2011 16:51:00 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
Message-ID: <9ck5upFlpnU1@mid.individual.net>

"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:a7cd34d7-ed2b-4449-8edc-a6a45b59ecde at hb5g2000vbb.googlegroups.com...
> >
>> > Possibly.
>> > I tried this:
>> > server.py -n -c config.ini
>> > Once again, the server is up and running and when I am logging in with 
>> > my
>> > browser (10.0.0.140:8081) I can see information showing up at the 
>> > command
>> > prompt, showing somebody is logging is, but the same error:
>> > "fshandler:get_data: \Webdav not found". During starting up the server
>> > mentioned: "pywebdav:Serving data from \Webdav".
>>
>> > In the config file it says:
>> > "# main directory
>> > directory = \Webdav"
>>
>> > Perhaps my Python configuration is at fault.
>>
>> > Fokke
>>
>> Is the path supposed to be absolute? In which case you'd need to have:
>> directory=C:\path\to\Webdav
>>
>> instead of just
>> directory=\Webdav
>>
>> I tried:
>> directory=D:\Webdav
>> directory=D:/Webdav
>>
>> To no avail.
>> It didn.t make any difference.
>>
>> I surely believe my WebDAV installation is at fault.
>>
>> Fokke
>
> Interestingly, looking at the code that returns the
> "fshandler:get_data: \Webdav not found" message, it looks like it
> tests that the path given exists and then tries an os.path.isfile,
> then an os.path.isdir. If both fail you get the message that you see.
> This might be a bit of a shot in the dark but could you try the path
> with and without a trailing '/' or '\'? I don't currently have a
> windows box available to test on and figure out why it would be
> detected as existing but not test true for either a file or directory.
>

Hi Becky,

I tried it straight away:
directory=D:\Webdav\
directory=D:/Webdav/

Didn't work, in both cases the same error "fshandler:get_data: \Webdav not 
found".

I have the opinion that my WebDAV installation is at fault. The database is 
not created either.
To have set up Python, I used python-2.7.2.msi.
To install WebDAV, I used PyWebDAV-0.9.4.1 and PyXML-0.8.4 packages, both 
Unix/Linux.
To install the, I used
"
>> You dont install from "Python GUI", use normal cmd, navigate to the 
>> folder
>> you downloaded PyXML and PyWebDAV and run "python setup.py install"
>> (python.exe has to be in your PATH). Then you have to find the
>> startup-script "davserver". Find your python installation directory and
>> look into<Install dir>/Tools/Scripts, in my computer this is
>> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
>> site-packages folder i.e. E:\python27\Lib/site-packages. You might have 
>> to
>> look for "davserver" there..."

Shall I re?nstall the whole lot? Would it make a difference if in that case 
I would use ActivePython-2.7.2.5-win32-x86.msi instead of python-2.7.2.msi?

Fokke







From joncle at googlemail.com  Mon Sep  5 10:59:31 2011
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 5 Sep 2011 07:59:31 -0700 (PDT)
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
	<j42n5g$qm5$1@solani.org>
Message-ID: <9bda87ee-ac0a-4b8f-b9a9-aa0cefd1bd04@k9g2000vbd.googlegroups.com>

On Sep 5, 3:43?pm, Peter Otten <__pete... at web.de> wrote:
> Kristofer Tengstr?m wrote:
> > Thanks everyone, moving the declaration to the class's __init__ method
> > did the trick. Now there's just one little problem left. I'm trying to
> > create a list that holds the parents for each instance in the
> > hierarchy. This is what my code looks like now:
>
> > -----------------------------------------
>
> > class A:
> > ? ? def __init__(self, parents=None):
> > ? ? ? ? self.sub = dict()
> > ? ? ? ? if parents:
>
> You should explicitly test for None here; otherwise in a call like
>
> ancestors = []
> a = A(anchestors)
>
> the list passed as an argument will not be used, which makes fore confusing
> behaviour.
>
> > ? ? ? ? ? ? self.parents = parents
> > ? ? ? ? else:
> > ? ? ? ? ? ? self.parents = []
> > ? ? def sub_add(self, cls):
> > ? ? ? ? hierarchy = self.parents
> > ? ? ? ? hierarchy.append(self)
>
> Here you are adding self to the parents (that should be called ancestors)
> and pass it on to cls(...). Then -- because it's non-empty -- it will be
> used by the child, too, and you end up with a single parents list.
>
> > ? ? ? ? obj = cls(hierarchy)
> > ? ? ? ? self.sub[obj.id] = obj
>
> While the minimal fix is to pass a copy
>
> def sub_add(self, cls):
> ? ? obj = cls(self.parents + [self])
> ? ? self.sub[obj.id] = obj
>
> I suggest that you modify your node class to keep track only of the direct
> parent instead of all ancestors. That makes the implementation more robust
> when you move a node to another parent.

I may not be understanding the OP correctly, but going by what you've
put here, I might be tempted to take this kind of stuff out of the
class's and using a graph library (such as networkx) - that way if
traversal is necessary, it might be a lot easier. But once again, I
must say I'm not 100% sure what the OP wants to achieve...

Jon.


From mdekauwe at gmail.com  Mon Sep  5 11:06:10 2011
From: mdekauwe at gmail.com (Martin De Kauwe)
Date: Mon, 5 Sep 2011 08:06:10 -0700 (PDT)
Subject: Best way to print a module?
Message-ID: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>

Hi,

If I wanted to print an entire module, skipping the attributes
starting with "__" is there an *optimal* way? Currently I am doing
something like this. Note I am just using sys here to make the point

import sys

data = []
for attr in sys.__dict__.keys():
    if not attr.startswith('__') and not attr.endswith('__'):
        attr_val = getattr(sys, attr)
        data.append((attr, attr_val))
data.sort()
for i in data:
    print "%s = %s" % (i[0], i[1])

Clearly this would be quicker if I didn't store it and sort the
output, i.e.

for attr in sys.__dict__.keys():
    if not attr.startswith('__') and not attr.endswith('__'):
        attr_val = getattr(sys, attr)
        print "%s = %s" % (attr, attr_val)

Anyway if there is a better way it would be useful to hear it...

Many thanks,

Martin


From wolftracks at invalid.com  Mon Sep  5 11:15:24 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 05 Sep 2011 08:15:24 -0700
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
Message-ID: <j42p3q$poq$1@dont-email.me>

See Subject.


From rosuav at gmail.com  Mon Sep  5 11:24:19 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 6 Sep 2011 01:24:19 +1000
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <j42p3q$poq$1@dont-email.me>
References: <j42p3q$poq$1@dont-email.me>
Message-ID: <CAPTjJmpBEf=MOh3dXPePkUonJqt5FjBc+67K3sf_OvVLy_7nKQ@mail.gmail.com>

On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson <wolftracks at invalid.com> wrote:
> See Subject.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

To what extent "familiar"? I have it installed on several computers,
but only because it comes with Open Wat C/C++.

With something off-topic like this, it might be better to have a real
email address, so the responses can be off-list.

ChrisA


From __peter__ at web.de  Mon Sep  5 11:28:43 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 05 Sep 2011 17:28:43 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
	<j42n5g$qm5$1@solani.org>
	<9bda87ee-ac0a-4b8f-b9a9-aa0cefd1bd04@k9g2000vbd.googlegroups.com>
Message-ID: <j42pr5$v2l$1@dough.gmane.org>

Jon Clements wrote:

> I
> must say I'm not 100% sure what the OP wants to achieve...

Learn Python? 

;)



From wolftracks at invalid.com  Mon Sep  5 12:15:20 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 05 Sep 2011 09:15:20 -0700
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <mailman.775.1315236269.27778.python-list@python.org>
References: <j42p3q$poq$1@dont-email.me>
	<mailman.775.1315236269.27778.python-list@python.org>
Message-ID: <j42sk7$lnj$1@dont-email.me>

On 9/5/2011 8:24 AM, Chris Angelico wrote:
> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>  wrote:
>> See Subject.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
> To what extent "familiar"? I have it installed on several computers,
> but only because it comes with Open Wat C/C++.
>
> With something off-topic like this, it might be better to have a real
> email address, so the responses can be off-list.
>
> ChrisA

sierra_mtnview @ sbcglobal.net
Here's the story.

As far as I can tell F77 1.8 is not available.  I've Googled quite a bit 
for it.  My source for 1.9 is 
<http://www.openwatcom.org/index.php/Download>. It gives me: 
open-watcom-f77-win32-1.9.exe.

When I install, there are only choices: Custom, which presumably will 
ask a lot of questions, and some one shot do-it without any 
intervention.  I took the latter.

..., XP, and no Win7? I use Win7. Trouble??

Something is amiss with my install. I downloaded 1.9. I did not use any 
customization.

  I can bring up the IDE easily. Using it is a different matter. The 
only Getting Started in F77 manual I can find is shown as v1.8.  If 1.9 
is needed, I can't find it. If I use the 1.8 manual, then the contents 
don't match up with what I find in the F77 IDE.  For example, the manual 
talks about a Kitchen project on page 15.  Not found anywhere in the 
install folder.



From dannagle at verizon.net  Mon Sep  5 12:22:51 2011
From: dannagle at verizon.net (Dan Nagle)
Date: Mon, 5 Sep 2011 12:22:51 -0400
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
References: <j42p3q$poq$1@dont-email.me> <j42sk7$lnj$1@dont-email.me>
Message-ID: <j42t0r$oht$1@dont-email.me>

Hello,

On 2011-09-05 16:15:20 +0000, W. eWatson said:

> On 9/5/2011 8:24 AM, Chris Angelico wrote:
>> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>  wrote:
>>> See Subject.

<snip>

>>> To what extent "familiar"? I have it installed on several computers,
>> but only because it comes with Open Wat C/C++.
>> 
>> With something off-topic like this,

<snip>

>> sierra_mtnview @ sbcglobal.net
> Here's the story.
> 
> As far as I can tell F77 1.8 is not available.  I've Googled quite a 
> bit for it.  My source for 1.9 is 
> <http://www.openwatcom.org/index.php/Download>. It gives me: 
> open-watcom-f77-win32-1.9.exe.

On Usenet, comp.lang.fortran might be the best source of help for this.
There's a good chance one of the regulars there can answer you
within one or two posts.  (I'll not cross-post, you can choose for yourself.)

HTH

-- 
Cheers!

Dan Nagle



From k.sahithi2862 at gmail.com  Mon Sep  5 12:23:00 2011
From: k.sahithi2862 at gmail.com (SAHITHI)
Date: Mon, 5 Sep 2011 09:23:00 -0700 (PDT)
Subject: FOR FAST UPDATES IN TELUGU FILM INDUSTRY
Message-ID: <9da5ae2b-4615-4bb6-bcd6-8b6ef68962bf@p37g2000prp.googlegroups.com>

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From rantingrick at gmail.com  Mon Sep  5 12:30:19 2011
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 5 Sep 2011 09:30:19 -0700 (PDT)
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
Message-ID: <0460d27a-ce73-40f5-a31a-6772eacb7784@l7g2000vbz.googlegroups.com>

On Sep 5, 10:06?am, Martin De Kauwe <mdeka... at gmail.com> wrote:
> Hi,
>
> If I wanted to print an entire module, skipping the attributes
> starting with "__" is there an *optimal* way? Currently I am doing
> something like this. Note I am just using sys here to make the point
>
> import sys
>
> data = []
> for attr in sys.__dict__.keys():
> ? ? if not attr.startswith('__') and not attr.endswith('__'):
> ? ? ? ? attr_val = getattr(sys, attr)
> ? ? ? ? data.append((attr, attr_val))
> data.sort()
> for i in data:
> ? ? print "%s = %s" % (i[0], i[1])
>
> Clearly this would be quicker if I didn't store it and sort the
> output, i.e.
>
> for attr in sys.__dict__.keys():
> ? ? if not attr.startswith('__') and not attr.endswith('__'):
> ? ? ? ? attr_val = getattr(sys, attr)
> ? ? ? ? print "%s = %s" % (attr, attr_val)
>
> Anyway if there is a better way it would be useful to hear it...
>
> Many thanks,
>
> Martin

Martin, have you considered that your custom function is just re-
inventing the built-in dir() function? I would suggest using a list
comprehension against the dir() function with a predicate to remove
anything that startswith '_'. Here's some Ruby code to solve the
problem. I'll let you figure out the Python equivalent.

rb> ['_hello', '__goodbye__', 'whatsup'].select{|x| x[0].chr != '_'}
["whatsup"]



From cjw at ncf.ca  Mon Sep  5 12:36:59 2011
From: cjw at ncf.ca (Colin J. Williams)
Date: Mon, 05 Sep 2011 12:36:59 -0400
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <j42t0r$oht$1@dont-email.me>
References: <j42p3q$poq$1@dont-email.me> <j42sk7$lnj$1@dont-email.me>
	<j42t0r$oht$1@dont-email.me>
Message-ID: <j42trk$rh9$1@dough.gmane.org>

On 05-Sep-11 12:22 PM, Dan Nagle wrote:
> Hello,
>
> On 2011-09-05 16:15:20 +0000, W. eWatson said:
>
>> On 9/5/2011 8:24 AM, Chris Angelico wrote:
>>> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>
>>> wrote:
>>>> See Subject.
>
> <snip>
>
>>>> To what extent "familiar"? I have it installed on several computers,
>>> but only because it comes with Open Wat C/C++.
>>>
>>> With something off-topic like this,
>
> <snip>
>
>>> sierra_mtnview @ sbcglobal.net
>> Here's the story.
>>
>> As far as I can tell F77 1.8 is not available. I've Googled quite a
>> bit for it. My source for 1.9 is
>> <http://www.openwatcom.org/index.php/Download>. It gives me:
>> open-watcom-f77-win32-1.9.exe.
>
> On Usenet, comp.lang.fortran might be the best source of help for this.
> There's a good chance one of the regulars there can answer you
> within one or two posts. (I'll not cross-post, you can choose for
> yourself.)
>
> HTH
>

You might get in touch with someone at Waterloo University, which is 
located in Kitchener/Waterloo.

This could have come from the 60's or 70's.

Good luck.

Colin W.



From tjreedy at udel.edu  Mon Sep  5 13:38:08 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 13:38:08 -0400
Subject: Need help with simple OOP Python question
In-Reply-To: <93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
Message-ID: <j431fj$fh5$1@dough.gmane.org>

On 9/5/2011 9:15 AM, Kristofer Tengstr?m wrote:
> Thanks everyone, moving the declaration to the class's __init__ method
> did the trick. Now there's just one little problem left. I'm trying to
> create a list that holds the parents for each instance in the
> hierarchy. This is what my code looks like now:
>
> -----------------------------------------
>
> class A:
>      def __init__(self, parents=None):
>          self.sub = dict()
>          if parents:
>              self.parents = parents
>          else:
>              self.parents = []
>      def sub_add(self, cls):
>          hierarchy = self.parents
>          hierarchy.append(self)
>          obj = cls(hierarchy)
>          self.sub[obj.id] = obj

Indexing objects by their internal id is usually useless. Considier 
whether you should be using sets rather than dicts.

-- 
Terry Jan Reedy




From noreply at domain.invalid  Mon Sep  5 13:45:25 2011
From: noreply at domain.invalid (William Gill)
Date: Mon, 05 Sep 2011 13:45:25 -0400
Subject: Functions vs OOP
In-Reply-To: <d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
References: <j3tjov$c30$1@dont-email.me>
	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
Message-ID: <j431q1$rrl$1@dont-email.me>

On 9/4/2011 9:13 AM, rusi wrote:
> On Sep 3, 9:15 pm, William Gill<nore... at domain.invalid>  wrote:
>> During some recent research, and re-familiarization with Python, I came
>> across documentation that suggests that programming using functions, and
>> programming using objects were somehow opposing techniques.
>
> Staying with (for the moment) the suggestion that OO-P and F-P are
> complementary, I believe it is worthwhile to distinguish syntactic OO-
> P vs F-P from semantic OO-P vs F-P.
>
> Syntactically: f(x) is functional x.f() is object oriented.
> Semantically if f's return value depends only on x ie does not depend
> on state it is functional (in the math sense) -- the jargon is that f
> is referentially transparent.

Not to split hairs, but syntactically f(x) is a function in many 
programming paradigms.

As I understand it functional programming places specific requirements 
on functions, i.e.referential transparency.  So f(x) may or may not be 
"functional".

x.f() is also a function, but it is a member of the object x, is 
referred to as a 'method' of x, and uses the syntactical "dot" notation 
object"dot"function for identification.

> Referential opaqueness is usually such a source of problems that it
> turns out good to contain the problem somewhat -- hence the wish for
> encapsulation.
>
> One can find in the python library itself all 4 combinations:
> syntactically and semantically OO : sort
> syntactically and semantically FP: sorted
> syntactically OO semantically FP: join



From nospam at domain.invalid  Mon Sep  5 14:58:29 2011
From: nospam at domain.invalid (William Gill)
Date: Mon, 05 Sep 2011 14:58:29 -0400
Subject: Functions vs OOP
In-Reply-To: <4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <j3tjov$c30$1@dont-email.me>
	<4e625508$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4364s$ia6$1@dont-email.me>

On 9/3/2011 12:25 PM, Steven D'Aprano wrote:
> William Gill wrote:
>
>> Are they suggesting that any function that takes an object as an
>> argument should always be a method of that object?
>
> Yes.

I can think of times when a special application, such as a converter, 
would take an object as an argument, but the somewhat unique nature of 
the application wouldn't justify changing the class to make the behavior 
into a method.

I could extend the underlying class to include the new behavior 
(method), but that would mean existing instances of the base class would 
need conversion to the new class, requiring yet another method.

Seems to me, that would be POOP (Puristic Object Oriented Programming) ;-)



From jeanmichel at sequans.com  Mon Sep  5 15:04:37 2011
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 05 Sep 2011 21:04:37 +0200
Subject: Functions vs OOP
In-Reply-To: <j431q1$rrl$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
	<j431q1$rrl$1@dont-email.me>
Message-ID: <4E651D45.4020602@sequans.com>

William Gill wrote:
>
> Not to split hairs, but syntactically f(x) is a function in many 
> programming paradigms.
>
> As I understand it functional programming places specific requirements 
> on functions, i.e.referential transparency.  So f(x) may or may not be 
> "functional".
>
> x.f() is also a function, but it is a member of the object x, is 
> referred to as a 'method' of x, and uses the syntactical "dot" 
> notation object"dot"function for identification.
>

Functional programming is not about writing a programm with functions 
(google it for more info). This may cause some confusion.

Your original post was about functions vs methods, which are identical 
except some syntax detail. FYI, in python x.f() is equivalent to f(x). 
In an OOP world one will  prefer the x.f() form.


JM





From timr at probo.com  Mon Sep  5 16:07:15 2011
From: timr at probo.com (Tim Roberts)
Date: Mon, 05 Sep 2011 13:07:15 -0700
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
Message-ID: <traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>

Martin De Kauwe <mdekauwe at gmail.com> wrote:
>
>If I wanted to print an entire module, skipping the attributes
>starting with "__" is there an *optimal* way? 

Your question is somewhat ambiguous.  When I read "print an entire module",
I assumed you were asking for a way to print the source code, perhaps with
syntax coloring.

Surely there is no reason to have an "optimal" method of doing this -- this
is never going to be in an inner loop.  If you have a method that works,
there is little justification to optimize...
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From jredgrave at capisco.com  Mon Sep  5 16:38:18 2011
From: jredgrave at capisco.com (Jon Redgrave)
Date: Mon, 5 Sep 2011 13:38:18 -0700 (PDT)
Subject: One line command line filter
Message-ID: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>

It seems unreasonably hard to write simple one-line unix command line
filters in python:

eg: ls | python -c "<something>  print x.upper()"

to get at sys.stdin or similar needs an import, which makes a
subsequent for-loop illegal.
python -c "import sys; for x in sys.stdin(): print x" <<- SyntaxError

Am I missing something obvious?

The best I've come up with is to use sitecustomize.py to add to
__builtin__
def stdin():
  import sys
  for x in sys.stdin():
    if not x: return
    yield x.strip()
import __builtin__
__builtin__.stdin = stdin

This allows
ls | python -c "for x in stdin(): print x.upper()"

Is there a better solution - if not is this worth a PEP?


From t at jollybox.de  Mon Sep  5 16:47:23 2011
From: t at jollybox.de (Thomas Jollans)
Date: Mon, 05 Sep 2011 22:47:23 +0200
Subject: One line command line filter
In-Reply-To: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <4E65355B.8040503@jollybox.de>

On 05/09/11 22:38, Jon Redgrave wrote:
> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
> 
> eg: ls | python -c "<something>  print x.upper()"
> 
> to get at sys.stdin or similar needs an import, which makes a
> subsequent for-loop illegal.
> python -c "import sys; for x in sys.stdin(): print x" <<- SyntaxError
> 
> Am I missing something obvious?

ls | python -c "for line in __import__('sys').stdin: print (line.upper())"


From jredgrave at capisco.com  Mon Sep  5 17:32:08 2011
From: jredgrave at capisco.com (Jon Redgrave)
Date: Mon, 5 Sep 2011 14:32:08 -0700 (PDT)
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.781.1315255602.27778.python-list@python.org>
Message-ID: <39f1dbdb-9e25-43b8-b293-395ccfc76e50@p10g2000yqi.googlegroups.com>

> > Am I missing something obvious?
>
> ls | python -c "for line in __import__('sys').stdin: print (line.upper())"

Ah, so I am missing something - it is possible - but 'obvious'?
Do people think it should be more accessible


From pythonfiddle at gmail.com  Mon Sep  5 18:00:36 2011
From: pythonfiddle at gmail.com (Python Fiddle Admin)
Date: Mon, 5 Sep 2011 15:00:36 -0700 (PDT)
Subject: Running Python Demo on the Web?
Message-ID: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>

Python has been ported to the web browser at pythonfiddle.com. Python
Fiddle can import snippets of code that you are reading on a web page
and run them in the browser. It supports a few popular libraries.

Another common usage is to post code on the site to allow other people
to play around with it. Also, it can be used to demonstrate a working
program.


From tjreedy at udel.edu  Mon Sep  5 18:21:56 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 18:21:56 -0400
Subject: One line command line filter
In-Reply-To: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <j43i3p$s67$1@dough.gmane.org>

On 9/5/2011 4:38 PM, Jon Redgrave wrote:
> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
>
> eg: ls | python -c "<something>   print x.upper()"
>
> to get at sys.stdin or similar needs an import, which makes a
> subsequent for-loop illegal.
> python -c "import sys; for x in sys.stdin(): print x"<<- SyntaxError
>
> Am I missing something obvious?

The doc says "-c <command>
Execute the Python code in command. command can be one or more 
statements separated by newlines,"

However, I have no idea how to put newlines into a command-line string. 
Changing '; ' to '\n' does not work, at least not in Windows. The '\n' 
is passed on to Python as 2 chars, and the '\' is seen as the 
line-continuation char and the 'n' as illegal following it. Will a *nix 
shell 'cook' the string and convert '\n' to a literal newline before 
passing it to Python?

For *nix, I would expect the <<EOF mechanism to work. Have you tried that?

That said, Python is designed for named multiple-statement programs,
just as it is designed for named multiple-statement functions. Or it is 
designed for interactive work.

The following works:
dir | python -c "while True: print(input())"

except that it finishes with an error traceback:
Traceback (most recent call last):
   File "<string>", line 1, in <module>
EOFError: EOF when reading a line

Perhaps tolerable if Python is at the end of the pipe, not otherwise.

 > Is there a better solution - if not is this worth a PEP?

PEPs have to propose a concrete solution, preferably with some previous 
discussion. I take is that your proposal would be to add another builtin 
means to access stdin.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep  5 18:55:36 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 18:55:36 -0400
Subject: Functions vs OOP
In-Reply-To: <j431q1$rrl$1@dont-email.me>
References: <j3tjov$c30$1@dont-email.me>
	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>
	<j431q1$rrl$1@dont-email.me>
Message-ID: <j43k2r$72g$1@dough.gmane.org>

On 9/5/2011 1:45 PM, William Gill wrote:
> On 9/4/2011 9:13 AM, rusi wrote:
>> On Sep 3, 9:15 pm, William Gill<nore... at domain.invalid> wrote:
>>> During some recent research, and re-familiarization with Python, I came
>>> across documentation that suggests that programming using functions, and
>>> programming using objects were somehow opposing techniques.
>>
>> Staying with (for the moment) the suggestion that OO-P and F-P are
>> complementary, I believe it is worthwhile to distinguish syntactic OO-
>> P vs F-P from semantic OO-P vs F-P.
>>
>> Syntactically: f(x) is functional x.f() is object oriented.
>> Semantically if f's return value depends only on x ie does not depend
>> on state it is functional (in the math sense) -- the jargon is that f
>> is referentially transparent.
>
> Not to split hairs, but syntactically f(x) is a function in many
> programming paradigms.
>
> As I understand it functional programming places specific requirements
> on functions, i.e.referential transparency. So f(x) may or may not be
> "functional".

In Python, it may be a parameterized procedure. Some languages separate 
functions and procedures (also called subroutines). Python does not. 
(Or you could say that it makes procedures into functions with 
side-effects by returning None by default).

> x.f() is also a function, but it is a member of the object x, is
> referred to as a 'method' of x, and uses the syntactical "dot" notation
> object"dot"function for identification.
>
>> Referential opaqueness is usually such a source of problems that it
>> turns out good to contain the problem somewhat -- hence the wish for
>> encapsulation.
>>
>> One can find in the python library itself all 4 combinations:
>> syntactically and semantically OO : sort
>> syntactically and semantically FP: sorted
>> syntactically OO semantically FP: join
>


-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep  5 19:02:04 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 19:02:04 -0400
Subject: One line command line filter
In-Reply-To: <39f1dbdb-9e25-43b8-b293-395ccfc76e50@p10g2000yqi.googlegroups.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.781.1315255602.27778.python-list@python.org>
	<39f1dbdb-9e25-43b8-b293-395ccfc76e50@p10g2000yqi.googlegroups.com>
Message-ID: <j43kf0$90e$1@dough.gmane.org>

On 9/5/2011 5:32 PM, Jon Redgrave wrote:
>>> Am I missing something obvious?
>>
>> ls | python -c "for line in __import__('sys').stdin: print (line.upper())"
>
> Ah, so I am missing something - it is possible - but 'obvious'?
> Do people think it should be more accessible

__import__ is well-documented and is listed in the index of the builtin 
functions chapter. "Direct use of __import__() is rare, except in cases 
where you want to import a module whose name is only known at runtime." 
could be explanded to include "or where you want to import as part of an 
expression"

Every Python programmer should peruse that chapter to learn what is 
available for possible future use.

-- 
Terry Jan Reedy



From mdekauwe at gmail.com  Mon Sep  5 19:02:41 2011
From: mdekauwe at gmail.com (Martin De Kauwe)
Date: Mon, 5 Sep 2011 16:02:41 -0700 (PDT)
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
	<traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>
Message-ID: <9c0733c8-875b-425a-9021-5f22bf75d1a6@m4g2000pri.googlegroups.com>

Hi,

Tim yes I had a feeling my posting might be read as ambiguous! Sorry I
was trying to quickly think of a good example. Essentially I have a
set of .ini parameter files which I read into my program using
configobj, I then replace the default module parameters if the user
file is different (in my program). When it comes to writing the data
back out I need to potentially loop over 5 module files and I need to
ignore the superfluous information. My guess is that the way I am
doing it might be a little on the slow side, hence the posting. Like
you said it might be that the way I am doing it is "fine", I just
wanted to see if there was a better way that is all.

Rantingrick I did actually try the dir() to start with, I can't
remember why I changed back. I will try your suggestion and see
(thanks)

So instead of sys as per my example my module more realistically looks
like this:

params.py

apples = 12.0
cats = 14.0
dogs = 1.3

so my fuller example then

import sys
sys.path.append("/Users/mdekauwe/Desktop/")
import params

#params.py contains
#apples = 12.0
#cats = 14.0
#dogs = 1.3

fname = "test.asc"
try:
    ofile = open(fname, 'w')
except IOError:
    raise IOError("Can't open %s file for write" % fname)

data = []
for attr in params.__dict__.keys():
    if not attr.startswith('__') and not attr.endswith('__'):
        attr_val = getattr(params, attr)
        data.append((attr, attr_val))

data.sort()
try:
    ofile.write("[params]\n")
    for i in data:
        ofile.write("%s = %s\n" % (i[0], i[1]))
except IOError:
    raise IOError("Error writing params files, params section")


etc, etc
thanks



From simoncropper at fossworkflowguides.com  Mon Sep  5 19:09:17 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Tue, 06 Sep 2011 09:09:17 +1000
Subject: Hello, and request for help with 'dynamic grids'
In-Reply-To: <624f5caf-e3c1-4a88-9861-606f7e2705e8@x14g2000prn.googlegroups.com>
References: <mailman.765.1315202654.27778.python-list@python.org>
	<624f5caf-e3c1-4a88-9861-606f7e2705e8@x14g2000prn.googlegroups.com>
Message-ID: <4E65569D.9000603@fossworkflowguides.com>

On 06/09/11 00:40, alex23 wrote:
> On Sep 5, 3:18 pm, Simon Cropper<simoncrop... at fossworkflowguides.com>
> wrote:
>> My investigations have generally found that windows/forms/data entry
>> screen can be created for a specific table or view, but these are
>> hard-wired during development. Is there anyway of rapidly defining the
>> grid during runtime so any table can be viewed?
>
> The commercial product Resolver One provides a grid/spreadsheet style
> interface with Python scripting capabilities. I'm not sure of its
> current licensing status but I believe it used to be free if used on
> open source projects.
>
> http://www.resolversystems.com/products/resolver-one/
>
> Each spreadsheet itself is Python code; I think it should be quite do-
> able to take something with introspective SQL capabilities like
> SQLAlchemy and have it title columns and fill them with the correct
> fields accordingly.
>
> Hope this helps.
>
>

Alex,

The Resolver Package looks good. Not exactly open source though. I 
equate it to a proprietary package that can at times be used for free by 
select groups.

The product creates spreadsheets with python code in the background 
(instead of say VBA in Excel or Basic in Calc).

Access to a database still needs to be hard-wired, so it does not act as 
a 'dynamic' viewer. The product works pretty much like Excel and Calc in 
this manner.

Sheets can be shared, although the Resolver Exchange website does not 
clarify the licence under which samples are released (GPL, CC, etc), so 
it is debatable how any of this could reliably be used in creation of 
derivatives.

 From what I can glean from this page...

      http://www.resolversystems.com/opensource/

      ... Resolver will allow you to use the package if you are an open 
source project to create spreadsheets that can be redistributed. For 
people to use these sheets they need to download the viewer or purchase 
the package.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From steve+comp.lang.python at pearwood.info  Mon Sep  5 19:18:37 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 09:18:37 +1000
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.782.1315261387.27778.python-list@python.org>
Message-ID: <4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>

Terry Reedy wrote:

> The doc says "-c <command>
> Execute the Python code in command. command can be one or more
> statements separated by newlines,"
> 
> However, I have no idea how to put newlines into a command-line string.

I imagine that it depends on the shell you are using, but bash on Linux
makes it simple: double quotes "..." are like Python's triple-quoted
strings in that they can include newlines.

[steve at sylar python]$ ls f*.py | python -c "import sys
> print sys.stdin.read()"
factorial.py
fetchqm.py
fib.py
fileutils.py
findsingle.py
fixascii.py
fix.py
frange.py
frequencies.py


Other shells may be different.


-- 
Steven



From mdekauwe at gmail.com  Mon Sep  5 19:20:42 2011
From: mdekauwe at gmail.com (Martin De Kauwe)
Date: Mon, 5 Sep 2011 16:20:42 -0700 (PDT)
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
	<traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>
	<9c0733c8-875b-425a-9021-5f22bf75d1a6@m4g2000pri.googlegroups.com>
Message-ID: <5de6e076-f25a-4a44-ba9b-2c99ff006565@e20g2000prn.googlegroups.com>

Trying to follow the suggestion this would be the alternate
implementation.

import sys
sys.path.append("/Users/mdekauwe/Desktop/")
import params

#params.py contains
#apples = 12.0
#cats = 14.0
#dogs = 1.3

fname = "test.asc"
try:
    ofile = open(fname, 'w')
except IOError:
    raise IOError("Can't open %s file for write" % fname)

attributes = [attr for attr in dir(params) if not
attr.startswith('__')]
attributes.sort()

try:
    ofile.write("[params]\n")
    for i in attributes:
        ofile.write("%s = %s\n" % (i, getattr(params, i)))
except IOError:
    raise IOError("Error writing params files, params section")

Is that a better version? I honestly don't know.

thanks


From steve+comp.lang.python at pearwood.info  Mon Sep  5 19:29:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 09:29:00 +1000
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <4e655b3e$0$29982$c3e8da3$5496439d@news.astraweb.com>

Jon Redgrave wrote:

> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
> 
> eg: ls | python -c "<something>  print x.upper()"

Python is neither bash nor Perl. It is not intended to compete in the "quick
and dirty one-liner commands" stakes.

However, you might like to consider ipython, which is intended as a complete
Python shell, not just an interactive interpreter.

http://ipython.org/


[...]
> The best I've come up with is to use sitecustomize.py to add to
> __builtin__

If you're a system administrator who wants to replace bash one-liners at the
command line with Python one-liners, sure, why not?

If you build up a useful collection of sys admin tools or recipes, you might
like to consider sharing them. Perhaps if Python was used more by sys
admins, there might be less resistance to making it easier to compete with
bash one-liners.


-- 
Steven



From steve+comp.lang.python at pearwood.info  Mon Sep  5 19:46:16 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 09:46:16 +1000
Subject: Best way to print a module?
References: <00c3e9d0-9c15-4d69-8b7f-ee0e6ecff508@m4g2000pri.googlegroups.com>
	<traa67hlthgbqrinmvpectcvd4la9lfams@4ax.com>
Message-ID: <4e655f4a$0$29965$c3e8da3$5496439d@news.astraweb.com>

Tim Roberts wrote:

> Martin De Kauwe <mdekauwe at gmail.com> wrote:
>>
>>If I wanted to print an entire module, skipping the attributes
>>starting with "__" is there an *optimal* way?
> 
> Your question is somewhat ambiguous.  When I read "print an entire
> module", I assumed you were asking for a way to print the source code,
> perhaps with syntax coloring.
> 
> Surely there is no reason to have an "optimal" method of doing this --
> this is never going to be in an inner loop.

Regardless of an inner loop or not, the time required for IO (reading the
file from disk, writing it to a printer) will be much larger than the time
required to skip dunder (double-underscore) objects.

> If you have a method that works, 
> there is little justification to optimize...

Pretty much.

HOWEVER, having agreed with you in general, in this specific case it is
obvious to me from context that the OP doesn't want to print the source
code of the module, but the module's names and their values.

I'd try a couple of approaches:

- use dir() or vars() to get the module's names, then loop and print each
one;

- make a shallow copy of the module __dict__, less dunder names, and pass it
to the prettyprint module for printing.



-- 
Steven



From nospam at domain.invalid  Mon Sep  5 20:30:47 2011
From: nospam at domain.invalid (William Gill)
Date: Mon, 05 Sep 2011 20:30:47 -0400
Subject: Functions vs OOP
In-Reply-To: <mailman.780.1315249547.27778.python-list@python.org>
References: <j3tjov$c30$1@dont-email.me>	<d6c071ac-2def-44a1-baa5-a545d2988def@a10g2000prn.googlegroups.com>	<j431q1$rrl$1@dont-email.me>
	<mailman.780.1315249547.27778.python-list@python.org>
Message-ID: <j43pju$s3j$1@dont-email.me>

On 9/5/2011 3:04 PM, Jean-Michel Pichavant wrote:
> William Gill wrote:
>>
>> Not to split hairs, but syntactically f(x) is a function in many
>> programming paradigms.
>>
>> As I understand it functional programming places specific requirements
>> on functions, i.e.referential transparency. So f(x) may or may not be
>> "functional".
>>
>> x.f() is also a function, but it is a member of the object x, is
>> referred to as a 'method' of x, and uses the syntactical "dot"
>> notation object"dot"function for identification.
>>
>
> Functional programming is not about writing a programm with functions
> <snip>. This may cause some confusion.

It can, and it did.  That was the impression I (incorrectly) got from 
the documentation.  Which didn't make sense to me.


> (google it for more info).

I can, and I did.  That, and the answers I got in this ng are how I 
corrected my misconception.

>
> Your original post was about functions vs methods, which are identical
> except some syntax detail. FYI, in python x.f() is equivalent to f(x).
> In an OOP world one will prefer the x.f() form.
>
No, my original post was about how (based on the aforementioned 
misconception) the documentation seemed to suggest that OOP should never 
have free standing functions, only methods.



From nospam at torek.net  Mon Sep  5 21:10:40 2011
From: nospam at torek.net (Chris Torek)
Date: 6 Sep 2011 01:10:40 GMT
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<4e5e5628$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<j3m4pg01enu@news4.newsguy.com>
	<m2wrdnf53u.fsf@cochabamba.vanoostrum.org>
Message-ID: <j43rug02nqb@news1.newsguy.com>

>Chris Torek <nospam at torek.net> writes:
>[snip]
>> when you have [an] instance and call [an] instance or class method:

[note: I have changed the names very slightly here, and removed
additional arguments, on purpose]

>>     black_knight = K()
>>     black_knight.spam()
>>     black_knight.eggs()
>>
>> the first parameters ... are magic, and invisible.
>>
>> Thus, Python is using the "explicit is better than implicit" rule
>> in the definition, but not at the call site. ...

In article <m2wrdnf53u.fsf at cochabamba.vanoostrum.org>
Piet van Oostrum  <piet at vanoostrum.org> wrote:
>It *is* explicit also at the call site. It only is written at the left
>of the dot rather than at the right of the parenthesis.

It cannot possibly be explicit.  The first parameter to one of the
method functions is black_knight, but the first parameter to the
other method is black_knight.__class__.

Which one is which?  Is spam() the instance method and eggs() the
class method, or is spam() the class method and eggs the instance
method?  (One does not, and should not, have to *care*, which is
kind of the point here. :-) )

>And that is necessary to locate which definition of the method
>applies.

By "that" I assume you mean the name "black_knight" here.  But the
name is not required to make the call; see the last line of the
following code fragment:

    funclist = []
    ...
    black_knight = K()
    funclist.append(black_knight.spam)
    funclist.append(black_knight.eggs)
    ...
    # At this point, let's say len(funclist) > 2,
    # and some number of funclist[i] entries are ordinary
    # functions that have no special first parameter.
    random.choice(funclist)()

>It would be silly to repeat this information after the parenthesis.
>Not only silly, it would be stupid as it would be a source of errors,
>and an example of DRY.

Indeed.  But I believe the above is a demonstration of how the
"self" or "cls" parameter is in fact implicit, not explicit.

(I am using python 2.x, and doing this in the interpreter:

    random.choice(funclist)

-- without the parentheses to call the function -- produces:

    <bound method K.[name omitted] of <__main__.K object at 0x249f50>>
    <bound method type.[name omitted] of <class '__main__.K'>>
    <function ordinary at 0x682b0>

The first is the instance method, whose name I am still keeping
secret; the second is the class method; and the third is the ordinary
function I added to the list.  The actual functions print their
own name and their parameters if any, and one can see that the
class and instance methods get one parameter, and the ordinary
function gets none.)
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From tjreedy at udel.edu  Mon Sep  5 21:25:44 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 05 Sep 2011 21:25:44 -0400
Subject: One line command line filter
In-Reply-To: <4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.782.1315261387.27778.python-list@python.org>
	<4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j43ssc$nee$1@dough.gmane.org>

On 9/5/2011 7:18 PM, Steven D'Aprano wrote:
> Terry Reedy wrote:
>
>> The doc says "-c<command>
>> Execute the Python code in command. command can be one or more
>> statements separated by newlines,"
>>
>> However, I have no idea how to put newlines into a command-line string.
>
> I imagine that it depends on the shell you are using, but bash on Linux
> makes it simple: double quotes "..." are like Python's triple-quoted
> strings in that they can include newlines.
>
> [steve at sylar python]$ ls f*.py | python -c "import sys
>> print sys.stdin.read()"
> factorial.py
> fetchqm.py

I was guessing that whoever wrote the doc could do something like that. 
As far as I know, there is no way to escape a newline with Windows 
cmd.exe. (Someone please tell me if I am wrong!) An "unmatched" quote is 
either ignored or matched by the newline!

C:\Programs\Python32> python -c "print('haha')
haha

-- 
Terry Jan Reedy



From jabba.laci at gmail.com  Mon Sep  5 21:36:46 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Mon, 5 Sep 2011 21:36:46 -0400
Subject: download pages using a cookies.txt file
Message-ID: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>

Hi,

I would like to download a page that requires authentication with
cookies. I've already figured out how to do it with wget (blog post
here: http://bit.ly/pp25LP). In short:
(1) extract cookies from Firefox's cookies.sqlite and store them in a text file
(2) wget --cookies=on --load-cookies=cookies.txt
--keep-session-cookies "http://..."

My question is: how to do it from Python? If possible, I want to avoid
making external calls to wget.

Thanks,

Laszlo


From sahil at FreeBSD.org  Mon Sep  5 21:45:02 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Mon, 5 Sep 2011 21:45:02 -0400
Subject: download pages using a cookies.txt file
In-Reply-To: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
References: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
Message-ID: <20110906014502.GE254@magic.hamla.org>

On Mon, 2011-09-05 at 21:36:46 -0400, Jabba Laci wrote:

> I would like to download a page that requires authentication with
> cookies. I've already figured out how to do it with wget (blog post
> here: http://bit.ly/pp25LP). In short:
> (1) extract cookies from Firefox's cookies.sqlite and store them in a text file
> (2) wget --cookies=on --load-cookies=cookies.txt
> --keep-session-cookies "http://..."
> 
> My question is: how to do it from Python? If possible, I want to avoid
> making external calls to wget.

Have you already explored the cookielib (known as http.cookiejar in
Python 3.0) module?

-- 
Sahil Tandon <sahil at FreeBSD.org>


From clp2 at rebertia.com  Mon Sep  5 22:19:17 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 5 Sep 2011 19:19:17 -0700
Subject: download pages using a cookies.txt file
In-Reply-To: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
References: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
Message-ID: <CAMZYqRTEnda-nidjk+uckAOCCx1e8q_kv2GN=8E9WxzSw10Uxg@mail.gmail.com>

On Mon, Sep 5, 2011 at 6:36 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> I would like to download a page that requires authentication with
> cookies. I've already figured out how to do it with wget (blog post
> here: http://bit.ly/pp25LP). In short:
> (1) extract cookies from Firefox's cookies.sqlite and store them in a text file
> (2) wget --cookies=on --load-cookies=cookies.txt
> --keep-session-cookies "http://..."
>
> My question is: how to do it from Python?

http://docs.python.org/library/cookielib.html#cookielib.MozillaCookieJar

Cheers,
Chris


From rantingrick at gmail.com  Mon Sep  5 23:58:30 2011
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 5 Sep 2011 20:58:30 -0700 (PDT)
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
Message-ID: <90128a68-1a3c-433a-8cf8-efa3b130d7ea@hb5g2000vbb.googlegroups.com>

On Aug 31, 9:35?am, "T. Goodchild" <tgoodch... at gmail.com> wrote:
> I?m new to Python, and I love it. ?The philosophy of the language (and
> of the community as a whole) is beautiful to me.

Welcome aboard mate!

> But one of the things that bugs me

Oh here we go! :-)

>  is the requirement that all class
> methods have 'self' as their first parameter. ?On a gut level, to me
> this seems to be at odds with Python?s dedication to simplicity.

It will will seem odd at first. I too hated typing all those "selfs"
all the time. But believe me my new friend in no time those selfs will
roll of your fingers with great ease. You'll forget how much you hate
them and find much more to complain about.

Like for instance: I really lament the missing redundancy of Explicit
Lexical Scoping in python. For me global variables should have to be
qualified.

> For example, consider Python?s indent-sensitive syntax. ?
> [...]
> and the result was a significantly improved
> signal-to-noise ratio in the readability of Python code.

Yes, forced indention is my favorite aspect of Python!

> So why is 'self' necessary on class methods?

It could be that Guido has a exaggerated self importance and just
liked the sound of all those selfs whist reading source code. However
i believe the real reason is really readability! It takes a while to
understand this aspect because the natural human response is to be
lazy (for instance i could have used "used to" in the previous
sentence if i was slothful). We are all inherently lazy beings who
need structure to keep us from spiraling out of control into the abyss
of selfishness.

GvR: Computer Scientist and Behavioral psychologist.


From steve+comp.lang.python at pearwood.info  Tue Sep  6 00:31:25 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 14:31:25 +1000
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<4e5e5628$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<j3m4pg01enu@news4.newsguy.com>
	<m2wrdnf53u.fsf@cochabamba.vanoostrum.org>
	<j43rug02nqb@news1.newsguy.com>
Message-ID: <4e65a21e$0$29969$c3e8da3$5496439d@news.astraweb.com>

On Tue, 6 Sep 2011 11:10 am Chris Torek wrote:

>>>     black_knight = K()
>>>     black_knight.spam()
>>>     black_knight.eggs()
>>>
>>> the first parameters ... are magic, and invisible.
>>>
>>> Thus, Python is using the "explicit is better than implicit" rule
>>> in the definition, but not at the call site. ...
> 
> In article <m2wrdnf53u.fsf at cochabamba.vanoostrum.org>
> Piet van Oostrum  <piet at vanoostrum.org> wrote:
>>It *is* explicit also at the call site. It only is written at the left
>>of the dot rather than at the right of the parenthesis.
> 
> It cannot possibly be explicit.  The first parameter to one of the
> method functions is black_knight, but the first parameter to the
> other method is black_knight.__class__.


I think you are expecting more explicitness than actually required. There
are degrees of explicitness:

- The current President of the United States is a black man.

- On 6th September 2011, the duly constituted President of the United 
  States of America is a black man.

- On 6th September 2011, the duly constituted government official with 
  the title of President of the nation known as the United States of 
  America is an individual member of the species Homo sapiens with XY
  chromosomes and of recent African ancestry.

As opposed to implicit:

- He is a black guy.


There is no requirement for every last gory detail to be overtly specified
in full. I quote from WordNet:

explicit
     adj 1: precisely and clearly expressed or readily observable;
            leaving nothing to implication; "explicit
            instructions"; "she made her wishes explicit";
            "explicit sexual scenes" [syn: expressed] [ant: implicit]
     2: in accordance with fact or the primary meaning of a term
        [syn: denotative]

Note the second definition in particular: in accordance with the primary
meaning of a term: the primary meaning of "class method" is that it
receives the class rather than the instance as first argument.

The "explicit is better than implicit" Zen should, in my opinion, be best
understood as a recommendation that code should, in general, avoid getting
input from context. In general, functions should avoid trying to decide 
which behaviour is wanted according to context or the environment:

def func(x):
    if running_in_a_terminal():
        print "The answer is", (x+1)/2
    else:
        printer = find_a_printer()
        if printer is not None:
            printer.send((x+1)/2, header="func(%r)"%x, footer="Page 1")
        else:
            # Try sending email to the current user, the default user,
            # postmaster or root in that order.
            msg = make_email("The answer is", (x+1)/2)
            for user in [get_current_user(), DEFAULT_USER, 
                         "root at localhost.localdomain", ...]:
                result = send_mail(msg, to=user)
                if result == 0: break
             else:
                # Fall back on beeping the speakers in Morse code
                ... 

(what if I want to beep the speakers from the terminal?), but not as a
prohibition against code like this:

def factorial(x):
    # Return the factorial of the integer part of x.
    n = int(x)
    if n <= 1: return 1
    return n*factorial(n-1)


There's no need to require the user to explicitly call int(x) before calling
factorial just to satisfy the Zen.

A function is free to process arguments as required, even to throw out
information (e.g. float -> int, instance -> class). What it shouldn't do is
*add* information implied by context (or at least, it should be very
cautious in doing so, and document it carefully, and preferably allow the
caller to easily override such implied data).


> Which one is which?  Is spam() the instance method and eggs() the
> class method, or is spam() the class method and eggs the instance
> method?  (One does not, and should not, have to *care*, which is
> kind of the point here. :-) )

You can't tell just from the syntax used to call them:

function(arg)
bound_method(arg)
builtin_function_or_method(arg)
callable_instance(arg)
type(arg)

all use the same syntax. There is no requirement that you should be able to
tell *everything* about a line of code just from the syntax used. If you
want to know whether black_knight.spam is an instance method or a class
method, or something else, use introspection to find out.

> By "that" I assume you mean the name "black_knight" here.  But the
> name is not required to make the call; see the last line of the
> following code fragment:
> 
>     funclist = []
>     ...
>     black_knight = K()
>     funclist.append(black_knight.spam)
>     funclist.append(black_knight.eggs)
>     ...
>     # At this point, let's say len(funclist) > 2,
>     # and some number of funclist[i] entries are ordinary
>     # functions that have no special first parameter.
>     random.choice(funclist)()

Irrelevant. The instance used for the bound method is explicitly specified
when you create it. But there's no requirement that you need to explicitly
specify the instance every single time you *use* the bound method. The
instance is part of the bound method, it isn't implied by context or
history or guessed from the environment.

Contrast what Python actually does with a hypothetical language where bound
methods' instances are implicitly assigned according to the most recent
instance created:

black_knight = Knight()
funclist.append(spam)  # refers to black_knight.spam
white_knight = Knight()
funclist.append(spam)  # refers to white_knight.spam
baldrick = Knave()
funclist.append(eggs)  # oops, Knaves don't have an eggs attribute



-- 
Steven



From haoxinfenshou98 at yahoo.com.cn  Tue Sep  6 01:51:43 2011
From: haoxinfenshou98 at yahoo.com.cn (shoestrade)
Date: Mon, 5 Sep 2011 22:51:43 -0700 (PDT)
Subject: When it comes to the Air Force
Message-ID: <ada66ba6-2af8-4f4e-b370-357e0a4103e7@a10g2000prn.googlegroups.com>

When it comes to the Air Force 1 {1}{/1}a lot of you might imagine
that it would be quite hard to continue improving and innovating on
the design of it, but leave it to Nike to surprise you at just about
every turn. Those of you that know Nike?s reputation know that they
always have new tricks hidden up their sleeves to keep t?
We well know that the Nike Air Force 1{2}{/2} is one of the most
versatile models that we have seen hosting a custom program called the
Nike Bespoke. Since the last pair of Nike Harajuku customs plus a
couple more designs done by different individuals, the AF1 has been
off the scene. Yet no worries because it ishttp://www.jordanshoesoutletnet.com/


From xyzhtml at 163.com  Tue Sep  6 01:57:31 2011
From: xyzhtml at 163.com (xyz)
Date: Tue, 6 Sep 2011 13:57:31 +0800
Subject: Floating point multiplication in python
Message-ID: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>

hi all:

As we know ,  1.1 * 1.1 is 1.21 . 
But in python ,I got following :

>>> 1.1 * 1.1
1.2100000000000002

why python get wrong result? Who can tell me  where's the 0.0000000000000002 from?


From clp2 at rebertia.com  Tue Sep  6 02:18:30 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 5 Sep 2011 23:18:30 -0700
Subject: Floating point multiplication in python
In-Reply-To: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
References: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
Message-ID: <CAMZYqRT5a+A-cqaTefQ5fBRr+gBMYcr4pWkUsi-q9ii9oNwO4Q@mail.gmail.com>

On Mon, Sep 5, 2011 at 10:57 PM, xyz <xyzhtml at 163.com> wrote:
> hi all:
>
> As we know , ?1.1 * 1.1 is 1.21 .
> But in python ,I got following :
>
>>>> 1.1 * 1.1
> 1.2100000000000002
>
> why python get wrong result?

It's not Python's fault per se, rather it's the inherent nature of
binary floating-point arithmetic. Try the equivalent in most other
languages and you'll get the same "error".
Please read http://docs.python.org/tutorial/floatingpoint.html

Cheers,
Chris


From jwiegley at gmail.com  Tue Sep  6 02:51:17 2011
From: jwiegley at gmail.com (John Wiegley)
Date: Tue, 06 Sep 2011 01:51:17 -0500
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <m24o0q410a.fsf@gmail.com>

>>>>> Jon Redgrave <jredgrave at capisco.com> writes:

> It seems unreasonably hard to write simple one-line unix command line
> filters in python:

> eg: ls | python -c "<something> print x.upper()"

[...]

> Is there a better solution - if not is this worth a PEP?

Have you looked at PyP (http://code.google.com/p/pyp)?

John


From gherron at islandtraining.com  Tue Sep  6 03:00:39 2011
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 06 Sep 2011 00:00:39 -0700
Subject: Floating point multiplication in python
In-Reply-To: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
References: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
Message-ID: <4E65C517.2080601@islandtraining.com>

On 09/05/2011 10:57 PM, xyz wrote:
> hi all:
>
> As we know ,  1.1 * 1.1 is 1.21 .
> But in python ,I got following :
>
>>>> 1.1 * 1.1
> 1.2100000000000002
>
> why python get wrong result? Who can tell me  where's the 0.0000000000000002 from?

It's not a python error    It's the nature of floating point arithmetic 
to be inaccurate on *ANY* computer.    Python just allows you to see the 
inaccuracies.

(But try:
   print 1.1*1.1
and see that the print statement does hide the roundoff error from you.)

Read this for more info:
     
http://pyfaq.infogami.com/why-are-floating-point-calculations-so-inaccurate



From steve+comp.lang.python at pearwood.info  Tue Sep  6 03:11:10 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 06 Sep 2011 17:11:10 +1000
Subject: Floating point multiplication in python
References: <mailman.790.1315289581.27778.python-list@python.org>
Message-ID: <4e65c78f$0$29974$c3e8da3$5496439d@news.astraweb.com>

On Tue, 6 Sep 2011 03:57 pm xyz wrote:

> hi all:
> 
> As we know ,  1.1 * 1.1 is 1.21 .
> But in python ,I got following :
> 
>>>> 1.1 * 1.1
> 1.2100000000000002


The problem is that 1.1 is a *decimal* number, but computers use *binary*,
and it is impossible to express 1.1 exactly as a binary number. So when you
type 1.1 into nearly all computer languages, what you are actually getting
is a tiny bit more than 1.1:

>>> repr(1.1)
'1.1000000000000001'


which is the closest number to 1.1 that is possible using a C double
floating point number.

Normally you don't see it, because Python truncates the result when
printing:

>>> str(1.1)
'1.1'

but the difference is there.


-- 
Steven



From pierre.quentel at gmail.com  Tue Sep  6 03:18:16 2011
From: pierre.quentel at gmail.com (Pierre Quentel)
Date: Tue, 6 Sep 2011 00:18:16 -0700 (PDT)
Subject: Relative seeks on string IO
Message-ID: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>

Hi,

I am wondering why relative seeks fail on string IO in Python 3.2

Example :

    from io import StringIO
    txt = StringIO('Favourite Worst Nightmare')
    txt.seek(8) # no problem with absolute seek

but

    txt.seek(2,1) # 2 characters from current position

raises "IOError: Can't do nonzero cur-relative seeks" (tested with
Python3.2.2 on WindowsXP)

A seek relative to the end of the string IO raises the same IOError

However, it is not difficult to simulate a class that performs
relative seeks on strings :

====================
class FakeIO:

    def __init__(self,value):
        self.value = value
        self.pos = 0

    def read(self,nb=None):
        if nb is None:
            return self.value[self.pos:]
        else:
            return self.value[self.pos:self.pos+nb]

    def seek(self,offset,whence=0):
        if whence==0:
            self.pos = offset
        elif whence==1: # relative to current position
            self.pos += offset
        elif whence==2: # relative to end of string
            self.pos = len(self.value)+offset

txt = FakeIO('Favourite Worst Nightmare')
txt.seek(8)
txt.seek(2,1)
txt.seek(-8,2)
=====================

Is there any reason why relative seeks on string IO are not allowed in
Python3.2, or is it a bug that could be fixed in a next version ?

- Pierre


From __peter__ at web.de  Tue Sep  6 03:53:07 2011
From: __peter__ at web.de (Peter Otten)
Date: Tue, 06 Sep 2011 09:53:07 +0200
Subject: One line command line filter
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
Message-ID: <j44jh3$uo$1@solani.org>

Jon Redgrave wrote:

> It seems unreasonably hard to write simple one-line unix command line
> filters in python:
> 
> eg: ls | python -c "<something>  print x.upper()"
> 
> to get at sys.stdin or similar needs an import, which makes a
> subsequent for-loop illegal.
> python -c "import sys; for x in sys.stdin(): print x" <<- SyntaxError
> 
> Am I missing something obvious?
> 
> The best I've come up with is to use sitecustomize.py to add to
> __builtin__
> def stdin():
>   import sys
>   for x in sys.stdin():
>     if not x: return
>     yield x.strip()
> import __builtin__
> __builtin__.stdin = stdin
> 
> This allows
> ls | python -c "for x in stdin(): print x.upper()"
> 
> Is there a better solution - if not is this worth a PEP?

$ touch alpha beta gamma omega
$ ls | python -c 'import sys; sys.stdout.writelines(s.upper() for s in 
sys.stdin if s.startswith(("a", "o")))'
ALPHA
OMEGA

If you are doing this a lot, why don't you write a helper script and invoke 
that? 

$ ls | pyfilter.py -f '"m" in line' -s 'lines = (line + line[::-1] for line 
in map(str.strip, lines))' -s'import re' -p 're.compile(r"(([a-
z])\2)").sub(lambda m: m.group(1).upper(), line)'
alphAAhpla
betAAteb
gaMMAAMMag
omegAAgemo

This relies on the convention that a single line of input is accessible as 
"line" and the complete input is called "lines". Of course the same can be 
done with python -c ..., -- and it is even more readable:

$ ls | python -c 'import re, sys
for line in sys.stdin:
>     line = line.strip()
>     line = line + line[::-1]
>     print re.compile(r"(([a-z])\2)").sub(lambda m: m.group(1).upper(), 
line)
> '
alphAAhpla
betAAteb
gaMMAAMMag
omegAAgemo

> Is there a better solution - if not is this worth a PEP?

The python interpreter could accept multiple -c arguments, but to see how 
this will be received a post on python-ideas should be sufficient.

For the sake of completeness here's the script I used to produce the example 
above:

$ cat pyfilter.py
#!/usr/bin/env python
import sys

def main():
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-s", "--setup",
        action="append", default=[],
        dest="setups", metavar="SETUP")
    parser.add_argument(
        "-f", "--filter",
        action="append", default=[],
        dest="filters", metavar="FILTER")
    parser.add_argument("-p", "--print", dest="format")

    args = parser.parse_args()
    lines = sys.stdin
    for setup in args.setups:
        exec setup
    for line in lines:
        line = line.rstrip("\n")
        for filter in args.filters:
            if not eval(filter):
                continue
        if args.format:
            line = eval(args.format)
        try:
            print line
        except IOError as e:
            if e.errno == 32: # broken pipe
                break
            raise
if __name__ == "__main__":
    main()


From 1248283536 at qq.com  Tue Sep  6 04:18:41 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 6 Sep 2011 16:18:41 +0800
Subject: strang thing:
Message-ID: <tencent_05A7597541D14E995173354F@qq.com>

i found stange thing that i can't solve
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()      
    for row in csv.reader(file):
                print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]

it's ok,
when i  add    (date,open,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
change the code into 
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()      
    for row in csv.reader(file):
            (date,open,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
            print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]


the wrong  output is :
    file = open(filename,'r')
TypeError: 'str' object is not callable

i don't know why??
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From rosuav at gmail.com  Tue Sep  6 04:22:37 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 6 Sep 2011 18:22:37 +1000
Subject: strang thing:
In-Reply-To: <tencent_05A7597541D14E995173354F@qq.com>
References: <tencent_05A7597541D14E995173354F@qq.com>
Message-ID: <CAPTjJmrJATNFPenVFpyhi0arPMzRMGXCw0dquRgyMfibaVibNw@mail.gmail.com>

2011/9/6 ???? <1248283536 at qq.com>:
> ??? file = open(filename,'r')

> when i? add??? (date,open,high,low,close,vol,adjclose) = (row[0], row[1],

You're assigning to the name "open", which is shadowing the built-in
of the same name. The second time through the loop, you're not calling
the usual open() function, you're trying to call your string. That's
what your error is telling you.

Hope that helps!

ChrisA


From wolfgang at rohdewald.de  Tue Sep  6 04:24:59 2011
From: wolfgang at rohdewald.de (Wolfgang Rohdewald)
Date: Tue, 6 Sep 2011 10:24:59 +0200
Subject: strang thing:
In-Reply-To: <tencent_05A7597541D14E995173354F@qq.com>
References: <tencent_05A7597541D14E995173354F@qq.com>
Message-ID: <201109061024.59596.wolfgang@rohdewald.de>

On Dienstag 06 September 2011, ???? wrote:
>             (date,open,high,low,close,vol,adjclose) = (row[0],
> row[1], row[2], row[3],row[4], row[5], row[6]) print  
> row[0], row[1], row[2], row[3],row[4], row[5], row[6]
> 
> 
> the wrong  output is :
>     file = open(filename,'r')
> TypeError: 'str' object is not callable

you reassigned "open" to be a string

-- 
Wolfgang


From duncan.booth at invalid.invalid  Tue Sep  6 04:30:53 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 6 Sep 2011 08:30:53 GMT
Subject: Floating point multiplication in python
References: <3348A754-2874-4E18-9E90-F9DB131E6AA0@163.com>
	<mailman.792.1315292754.27778.python-list@python.org>
Message-ID: <Xns9F5860481F813duncanbooth@127.0.0.1>

Gary Herron <gherron at islandtraining.com> wrote:

> (But try:
>    print 1.1*1.1
> and see that the print statement does hide the roundoff error from you.)

That varies according to the version of Python you are using. On my system:

Python 2.7 (r27:82525, Jul  4 2010, 09:01:59) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> print(1.1*1.1)
1.21
>>> ^Z


C:\Python27>cd \python32

C:\Python32>python
Python 3.2.1 (default, Jul 10 2011, 21:51:15) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> print(1.1*1.1)
1.2100000000000002

-- 
Duncan Booth http://kupuguy.blogspot.com


From k.sahithi2862 at gmail.com  Tue Sep  6 05:20:38 2011
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Subject: SOUTH INDIAN HOT ACTRESS
Message-ID: <f78b9353-7cca-4227-b5e7-0a742a766070@x21g2000prd.googlegroups.com>

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From sinisa.segvic at fer.hr  Tue Sep  6 05:59:07 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Tue, 6 Sep 2011 02:59:07 -0700 (PDT)
Subject: Portable locale usage
Message-ID: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>

Hi,

I am musing on how to write portable Python3 code which would
take advantage of the standard locale module.

For instance, it would be very nice if we could say something like:

# does not work!
myISOCountryCode='hr'
locale.setlocale(locale.LC_ALL, (myISOCountryCode,
locale.getpreferredencoding()))

Up to now, I have found ways to set locale on Linux and Windows:

import locale
locale.setlocale(locale.LC_ALL, 'hr_HR.utf8')      # works on linux
locale.setlocale(locale.LC_ALL, 'hrv_HRV.1250') # works on windows

I have noticed that locale defines a dictionary locale.locale_alias,
and that it contains the following promising keys: 'hr_hr',
'hrvatski', 'hr'.
Unfortunately, both on Windows and Linux all these keys
are bound to the same outdated string 'hr_HR.ISO8859-2'.

My questions are the following:

1. Is there a way for writing portable Python code dealing with
locales
    (as sketched in the beginning)?

2. If not, is there anything wrong with that idea?

3. What is the status of locale.locale_alias (official documentation
does not mention it)?


Cheers,

Sinisa

http://www.zemris.fer.hr/~ssegvic/index_en.html


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Tue Sep  6 06:14:57 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Tue, 06 Sep 2011 12:14:57 +0200
Subject: Floating point multiplication in python
In-Reply-To: <mailman.790.1315289581.27778.python-list@python.org>
References: <mailman.790.1315289581.27778.python-list@python.org>
Message-ID: <j44rre$e4c$1@r03.glglgl.eu>

Am 06.09.2011 07:57 schrieb xyz:
> hi all:
>
> As we know ,  1.1 * 1.1 is 1.21 .
> But in python ,I got following :
>
>>>> 1.1 * 1.1
> 1.2100000000000002
>
> why python get wrong result? Who can tell me  where's the 0.0000000000000002 from?

1.1 does not fit in a binary floating point number. It is approximated - 
in binary! - as 1.000110011001100110011 ... (periodically).

Note that, while in the decimal system we normally use, only numbers 
which have other components in the denominator than 2 or 5 are 
periodically, in the binary systems only components with 2 are allowed 
in order not to be periodically.

Example: 3.453 is not periodically, because it is 3453/100 and 100 has 
only the factors 2 and 5, each twice.

1/3 = .3333333... is periodically, because it has the factor 3. The same 
applies to 1/6, which has 2 and 3 as factors. The latter destroys the 
non-periodical behaviour.

As said, in the dual system, only the 2 is allowed.

.5 (10) = 2** -1 = .1 (2).
.25 (10) = 2 ** -2 = .01 (2).
.75 (10) = their sum = .11 (2).

But .1 (1/10) is more complicated, -2 would be as well.

As the IEEE floating point representation is limited, there is a slight 
error value which makes the stored value differ from the intended one.

Look here:



>>> x=(1,0,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1)
>>> a=0
>>> for n,i in enumerate(x): a += i*2**-n; print a, a-1.1, i*2**-n, a-olda
...
1 -0.1 1 1
1.0 -0.1 0.0 0.0
1.0 -0.1 0.0 0.0
1.0 -0.1 0.0 0.0
1.0625 -0.0375 0.0625 0.0625
1.09375 -0.00625 0.03125 0.03125
1.09375 -0.00625 0.0 0.0
1.09375 -0.00625 0.0 0.0
1.09765625 -0.00234375 0.00390625 0.00390625
1.099609375 -0.000390625 0.001953125 0.001953125
1.099609375 -0.000390625 0.0 0.0
1.099609375 -0.000390625 0.0 0.0
1.09985351562 -0.000146484375 0.000244140625 0.000244140625
1.09997558594 -2.44140625001e-05 0.0001220703125 0.0001220703125
1.09997558594 -2.44140625001e-05 0.0 0.0
1.09997558594 -2.44140625001e-05 0.0 0.0
1.09999084473 -9.15527343759e-06 1.52587890625e-05 1.52587890625e-05
1.09999847412 -1.52587890634e-06 7.62939453125e-06 7.62939453125e-06
1.09999847412 -1.52587890634e-06 0.0 0.0
1.09999847412 -1.52587890634e-06 0.0 0.0
1.0999994278 -5.72204589933e-07 9.53674316406e-07 9.53674316406e-07
1.09999990463 -9.53674317294e-08 4.76837158203e-07 4.76837158203e-07
1.09999990463 -9.53674317294e-08 0.0 0.0
1.09999990463 -9.53674317294e-08 0.0 0.0
1.09999996424 -3.57627869541e-08 5.96046447754e-08 5.96046447754e-08
1.09999999404 -5.96046456636e-09 2.98023223877e-08 2.98023223877e-08
1.09999999404 -5.96046456636e-09 0.0 0.0
1.09999999404 -5.96046456636e-09 0.0 0.0
1.09999999776 -2.23517426789e-09 3.72529029846e-09 3.72529029846e-09
1.09999999963 -3.72529118664e-10 1.86264514923e-09 1.86264514923e-09
1.09999999963 -3.72529118664e-10 0.0 0.0
1.09999999963 -3.72529118664e-10 0.0 0.0
1.09999999986 -1.3969847501e-10 2.32830643654e-10 2.32830643654e-10
1.09999999998 -2.32831531832e-11 1.16415321827e-10 1.16415321827e-10
1.09999999998 -2.32831531832e-11 0.0 0.0
1.09999999998 -2.32831531832e-11 0.0 0.0
1.09999999999 -8.73123795486e-12 1.45519152284e-11 1.45519152284e-11
1.1 -1.45528034068e-12 7.27595761418e-12 7.27595761418e-12
1.1 -1.45528034068e-12 0.0 0.0
1.1 -1.45528034068e-12 0.0 0.0
1.1 -5.45785638906e-13 9.09494701773e-13 9.09494701773e-13
1.1 -9.10382880193e-14 4.54747350886e-13 4.54747350886e-13
1.1 -9.10382880193e-14 0.0 0.0
1.1 -9.10382880193e-14 0.0 0.0
1.1 -3.41948691585e-14 5.68434188608e-14 5.68434188608e-14
1.1 -5.77315972805e-15 2.84217094304e-14 2.84217094304e-14
1.1 -5.77315972805e-15 0.0 0.0
1.1 -5.77315972805e-15 0.0 0.0
1.1 -2.22044604925e-15 3.5527136788e-15 3.5527136788e-15
1.1 -4.4408920985e-16 1.7763568394e-15 1.7763568394e-15
1.1 -4.4408920985e-16 0.0 0.0
1.1 -4.4408920985e-16 0.0 0.0
1.1 -2.22044604925e-16 2.22044604925e-16 2.22044604925e-16
1.1 0.0 1.11022302463e-16 2.22044604925e-16
1.1 0.0 0.0 0.0
1.1 0.0 0.0 0.0
1.1 0.0 1.38777878078e-17 0.0
1.1 0.0 6.93889390391e-18 0.0

So here we have reached the point where the maximum precision is reached 
- a doesn't change anymore, although it should. The error is about 1E-16.

Now if you multiply two values with an error, the error also propagates 
into the result - PLUs the result can have its own error source - in the 
same order of magnitude.

(a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e 
or (2*a + e) * e.


From donstockbauer at hotmail.com  Tue Sep  6 06:46:38 2011
From: donstockbauer at hotmail.com (Don Stockbauer)
Date: Tue, 6 Sep 2011 03:46:38 -0700 (PDT)
Subject: When it comes to the Air Force
References: <ada66ba6-2af8-4f4e-b370-357e0a4103e7@a10g2000prn.googlegroups.com>
Message-ID: <a437e6a1-14c0-4c9b-91e6-bc2f655dba74@d2g2000vby.googlegroups.com>

On Sep 6, 12:51?am, shoestrade <haoxinfensho... at yahoo.com.cn> wrote:
> When it comes to the Air Force 1 {1}{/1}a lot of you might imagine
> that it would be quite hard to continue improving and innovating on
> the design of it, but leave it to Nike to surprise you at just about
> every turn. Those of you that know Nike?s reputation know that they
> always have new tricks hidden up their sleeves to keep t?
> We well know that the Nike Air Force 1{2}{/2} is one of the most
> versatile models that we have seen hosting a custom program called the
> Nike Bespoke. Since the last pair of Nike Harajuku customs plus a
> couple more designs done by different individuals, the AF1 has been
> off the scene. Yet no worries because it ishttp://www.jordanshoesoutletnet.com/

But how does the Air Force relate to Skynet?????


From hansmu at xs4all.nl  Tue Sep  6 07:15:10 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Tue, 06 Sep 2011 13:15:10 +0200
Subject: One line command line filter
In-Reply-To: <4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
References: <4725b2c3-d930-4fb0-9fe7-a286d150f9c5@d18g2000yqm.googlegroups.com>
	<mailman.782.1315261387.27778.python-list@python.org>
	<4e6558ce$0$29968$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e6600be$0$2480$e4fe514c@news2.news.xs4all.nl>

On 6/09/11 01:18:37, Steven D'Aprano wrote:
> Terry Reedy wrote:
>
>> The doc says "-c<command>
>> Execute the Python code in command. command can be one or more
>> statements separated by newlines,"
>>
>> However, I have no idea how to put newlines into a command-line string.
>
> I imagine that it depends on the shell you are using, but bash on Linux
> makes it simple: double quotes "..." are like Python's triple-quoted
> strings in that they can include newlines.

Single quotes in bash are more similar to triple quotes in Python, in
that some shell syntax is recognized within double quoted string, but
not within single quoted strings:

$ python -c 'import sys
print `sys.version`'
'2.7.1 (r271:86882M, Nov 30 2010, 10:35:34) \n[GCC 4.2.1 (Apple Inc. 
build 5664)]'

$ python -c "import sys
 > print `sys.copyright`"
-bash: sys.copyright: command not found

When using single quotes, the `` are passed to Python, which interprets
them as a call to repr().  With double quotes, the shell interprets ``
as a sub-command.

> Other shells may be different.

Most *nix shells are similar to bash. The ones that are different
are csh and tcsh: they require a backslash before each newline:

$ tcsh
% ls f*.py | python -c 'import sys \
? print sys.stdin.read()'
filecmp.py
fileinput.py
fnmatch.py
formatter.py
fpformat.py
fractions.py
ftplib.py
functools.py
%

Sometimes you need two backslashes, one for csh and one for Python:

% python -c 'print "spam spam spam spam spam spam spam spam " \\
? "spam spam spam spam spam"'
spam spam spam spam spam spam spam spam spam spam spam spam spam
%

Hope this helps,

-- HansM






From t at jollybox.de  Tue Sep  6 07:16:50 2011
From: t at jollybox.de (Thomas Jollans)
Date: Tue, 06 Sep 2011 13:16:50 +0200
Subject: Portable locale usage
In-Reply-To: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
Message-ID: <4E660122.3000507@jollybox.de>

On 06/09/11 11:59, ssegvic wrote:
> Hi,
> 
> I am musing on how to write portable Python3 code which would
> take advantage of the standard locale module.
> 
> For instance, it would be very nice if we could say something like:
> 
> # does not work!
Doesn't it?

> myISOCountryCode='hr'

This is a language code. (there also happens to be a country code 'hr',
but you're referring to the Croatian language, 'hr')

> locale.setlocale(locale.LC_ALL, (myISOCountryCode,
> locale.getpreferredencoding()))

As far as I can tell, this does work. Can you show us a traceback?

> Up to now, I have found ways to set locale on Linux and Windows:
> 
> import locale
> locale.setlocale(locale.LC_ALL, 'hr_HR.utf8')      # works on linux
> locale.setlocale(locale.LC_ALL, 'hrv_HRV.1250') # works on windows
> 
> I have noticed that locale defines a dictionary locale.locale_alias,
> and that it contains the following promising keys: 'hr_hr',
> 'hrvatski', 'hr'.
> Unfortunately, both on Windows and Linux all these keys
> are bound to the same outdated string 'hr_HR.ISO8859-2'.

It looks like you don't actually care about the encoding: in your first
example, you use the default system encoding, which you do not control,
and in your second example, you're using two different encodings on the
two platforms. So why do you care whether or not the default uses ISO
8859-2 ?

> My questions are the following:
> 
> 1. Is there a way for writing portable Python code dealing with
> locales
>     (as sketched in the beginning)?
> 
> 2. If not, is there anything wrong with that idea?

As I said, I believe the above code should work. It works on my Linux
system.

What are you attempting to achieve with this setting of the locale,
without even setting the encoding? Doesn't it make more sense to simply
use the user's usual locale, and interact with them on their own terms?

> 3. What is the status of locale.locale_alias (official documentation
> does not mention it)?

I don't know, but I'd assume it's not considered part of the public API,
and you that shouldn't assume that it'll exist in future versions of Python.

Thomas


From bex.lewis at gmail.com  Tue Sep  6 07:46:20 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 6 Sep 2011 04:46:20 -0700 (PDT)
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
Message-ID: <f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>

On Sep 5, 3:51 pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
>
> Hi Becky,
>
> I tried it straight away:
> directory=D:\Webdav\
> directory=D:/Webdav/
>
> Didn't work, in both cases the same error "fshandler:get_data: \Webdav not
> found".
>
> I have the opinion that my WebDAV installation is at fault. The database is
> not created either.
> To have set up Python, I used python-2.7.2.msi.
> To install WebDAV, I used PyWebDAV-0.9.4.1 and PyXML-0.8.4 packages, both
> Unix/Linux.
> To install the, I used
> "
>
> >> You dont install from "Python GUI", use normal cmd, navigate to the
> >> folder
> >> you downloaded PyXML and PyWebDAV and run "python setup.py install"
> >> (python.exe has to be in your PATH). Then you have to find the
> >> startup-script "davserver". Find your python installation directory and
> >> look into<Install dir>/Tools/Scripts, in my computer this is
> >> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
> >> site-packages folder i.e. E:\python27\Lib/site-packages. You might have
> >> to
> >> look for "davserver" there..."
>
> Shall I re?nstall the whole lot? Would it make a difference if in that case
> I would use ActivePython-2.7.2.5-win32-x86.msi instead of python-2.7.2.msi?
>
> Fokke

You could try that but I'd imagine you'll end up with the same issue.
My best guess is that something is preventing os.path.isdir from
detecting the path as a directory under windows. I can't reproduce it
on my Linux system but may have a working windows installation later.
If I were you I'd fire up a python shell (execute python and get the
>>> prompt), import os.path and manually try os.path.isdir(path_name)
to try and find out what the actualy problem is.


From santosh.dumbre at gmail.com  Tue Sep  6 07:58:04 2011
From: santosh.dumbre at gmail.com (Santosh Dumbre)
Date: Tue, 6 Sep 2011 17:28:04 +0530
Subject: Beginner's query - What is scope of Python for Embedded
	Programming(C, C++) ?
Message-ID: <CAFr9_YS=DwbSgthL+mv2s=EkvGdKpP2AOQztHDZMWVNG5aunaw@mail.gmail.com>

Hi,

Please consider a beginner's query -

I am 9 -years experienced in C++.
Currently working in Automation domain.

Will Python help me to work in Automation/Embedded domain ?

Your advice is highly appreciated.

Please reply.

Thanks a lot,
Santosh.
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From bex.lewis at gmail.com  Tue Sep  6 08:01:33 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 6 Sep 2011 05:01:33 -0700 (PDT)
Subject: Running Python Demo on the Web?
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
Message-ID: <d002da6b-606a-4e17-a2e8-041fd7215ea1@y21g2000yqy.googlegroups.com>

On Sep 5, 11:00?pm, Python Fiddle Admin <pythonfid... at gmail.com>
wrote:
> Python has been ported to the web browser at pythonfiddle.com. Python
> Fiddle can import snippets of code that you are reading on a web page
> and run them in the browser. It supports a few popular libraries.
>
> Another common usage is to post code on the site to allow other people
> to play around with it. Also, it can be used to demonstrate a working
> program.

Looks interesting but you don't appear to have support for most (any?)
of the python core libs. Are you planning on adding more libraries?


From cjw at ncf.ca  Tue Sep  6 08:10:16 2011
From: cjw at ncf.ca (Colin J. Williams)
Date: Tue, 06 Sep 2011 08:10:16 -0400
Subject: Running Python Demo on the Web?
In-Reply-To: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
Message-ID: <j452jm$n8v$1@dough.gmane.org>

On 05-Sep-11 18:00 PM, Python Fiddle Admin wrote:
> Python has been ported to the web browser at pythonfiddle.com. Python
> Fiddle can import snippets of code that you are reading on a web page
> and run them in the browser. It supports a few popular libraries.
>
> Another common usage is to post code on the site to allow other people
> to play around with it. Also, it can be used to demonstrate a working
> program.
A neat idea.

import brian
dir(brian)

Responds "scipy not available"

Colin W.



From zdoor at xs4all.nl  Tue Sep  6 08:42:39 2011
From: zdoor at xs4all.nl (Alex van der Spek)
Date: Tue, 6 Sep 2011 08:42:39 -0400
Subject: HDF5 tree walker
Message-ID: <4e661540$0$2439$e4fe514c@news2.news.xs4all.nl>

Is there an equivalent to os.path.walk() for HDF5 file trees accessed 
through h5py?

Thanks!
Alex van der Spek 




From dreyemi at gmail.com  Tue Sep  6 09:02:24 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 6 Sep 2011 14:02:24 +0100
Subject: Python marks an instance of my class undefined
Message-ID: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>

Is there anything I need to do to create an instance of a class?

I have this simple code(The class is in a package core.fleet):

class Fleet(object):
    def __init__(self):
        """ no-arg constructor """
    def fleet_file_upload(self, filename, type=None):
        if type == 'user':
            return 'photos/%Y/%m/%d'
        return 'images'

    def fleet_get_fleet(self):
        """ Get all fleet """
        return db.db_get_fleet()

    def fleet_get_fleet_type(self):
        """ Get fleet by type or category """

For Python shell, I did this:

>>> import core.fleet
>>> f = Fleet()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
NameError: name 'Fleet' is not defined

What am I doing wrong?


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From vlastimil.brom at gmail.com  Tue Sep  6 09:13:17 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 6 Sep 2011 15:13:17 +0200
Subject: Portable locale usage
In-Reply-To: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
Message-ID: <CAHzaPEPLDYh4v0apnUSJnAtPw1ZUDd9uZL3+v6PS3aKuXJjzSA@mail.gmail.com>

2011/9/6 ssegvic <sinisa.segvic at fer.hr>:
> Hi,
>
> I am musing on how to write portable Python3 code which would
> take advantage of the standard locale module.
>
> For instance, it would be very nice if we could say something like:
>
> # does not work!
> myISOCountryCode='hr'
> locale.setlocale(locale.LC_ALL, (myISOCountryCode,
> locale.getpreferredencoding()))
>
> Up to now, I have found ways to set locale on Linux and Windows:
>
> import locale
> locale.setlocale(locale.LC_ALL, 'hr_HR.utf8') ? ? ?# works on linux
> locale.setlocale(locale.LC_ALL, 'hrv_HRV.1250') # works on windows
>
> I have noticed that locale defines a dictionary locale.locale_alias,
> and that it contains the following promising keys: 'hr_hr',
> 'hrvatski', 'hr'.
> Unfortunately, both on Windows and Linux all these keys
> are bound to the same outdated string 'hr_HR.ISO8859-2'.
>
> My questions are the following:
>
> 1. Is there a way for writing portable Python code dealing with
> locales
> ? ?(as sketched in the beginning)?
>
> 2. If not, is there anything wrong with that idea?
>
> 3. What is the status of locale.locale_alias (official documentation
> does not mention it)?
>
>
> Cheers,
>
> Sinisa
>
> http://www.zemris.fer.hr/~ssegvic/index_en.html
> --
> http://mail.python.org/mailman/listinfo/python-list
>

There may be some differences btween OSes end the versions, but using
python 2.7 and 3.2 on Win XP and Win7 (Czech)
I get the following results for setlocale:

>>> locale.setlocale(locale.LC_ALL,'Croatian')
'Croatian_Croatia.1250'
>>> locale.getlocale()
('Croatian_Croatia', '1250')
>>> locale.getpreferredencoding(do_setlocale=False)
'cp1250'
>>>

However, "hr" is not recognised on this systems:

>>> locale.setlocale(locale.LC_ALL, "hr")
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "locale.pyc", line 531, in setlocale
Error: unsupported locale setting
>>>

regards,
   vbr


From wxjmfauth at gmail.com  Tue Sep  6 09:37:51 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 6 Sep 2011 06:37:51 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
Message-ID: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>

This is just an attempt to put the
http://groups.google.com/group/comp.lang.python/browse_thread/thread/a008af1ac2968833#
discussion at a correct level.

With Python 2.7 a new float number representation (the David Gay's
algorithm)
has been introduced. If this is well honored in Python 2.7, it
seems to me, there are some missmatches in the Py3 series.

>>> sys.version
'2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit
(Intel)]'
>>> 0.1
0.10000000000000001
>>> print 0.1
0.1
>>> 1.1 * 1.1
1.2100000000000002
>>> print 1.1 * 1.1
1.21
>>> print repr(1.1 * 1.1)
1.2100000000000002
>>>


>>> sys.version
2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
>>>
>>> 0.1
0.1
>>> print 0.1
0.1
>>> 1.1 * 1.1
1.21
>>> print 1.1 * 1.1
1.21
>>> print repr(1.1 * 1.1)
1.2100000000000002
>>>


>>> sys.version
'3.1.4 (default, Jun 12 2011, 15:05:44) [MSC v.1500 32 bit (Intel)]'
>>> 0.1
0.1
>>> print(0.1)
0.1
>>> 1.1 * 1.1
1.2100000000000002
>>> print(1.1 * 1.1)
1.21
>>> print(repr(1.1 * 1.1))
1.2100000000000002
>>> '{:g}'.format(1.1 * 1.1)
'1.21'



>>> sys.version
'3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)]'
>>> 0.1
0.1
>>> print(0.1)
0.1
>>> 1.1 * 1.1
1.2100000000000002
>>> print (1.1 * 1.1)
1.2100000000000002
>>> print(repr((1.1 * 1.1)))
1.2100000000000002
>>>
>>> '{:g}'.format(1.1 * 1.1)
'1.21'
>>>

jmf


From dreyemi at gmail.com  Tue Sep  6 09:42:54 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 6 Sep 2011 14:42:54 +0100
Subject: Python marks an instance of my class undefined
In-Reply-To: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
Message-ID: <CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>

I was able to get this solved by calling class like this:

>>> from core.fleet import Fleet
>>> f = Fleet()

Thanks to a thread from the list titled "TypeError: 'module' object is not
callable"

On Tue, Sep 6, 2011 at 2:02 PM, Kayode Odeyemi <dreyemi at gmail.com> wrote:

> Is there anything I need to do to create an instance of a class?
>
> I have this simple code(The class is in a package core.fleet):
>
> class Fleet(object):
>     def __init__(self):
>         """ no-arg constructor """
>     def fleet_file_upload(self, filename, type=None):
>         if type == 'user':
>             return 'photos/%Y/%m/%d'
>         return 'images'
>
>     def fleet_get_fleet(self):
>         """ Get all fleet """
>         return db.db_get_fleet()
>
>      def fleet_get_fleet_type(self):
>         """ Get fleet by type or category """
>
> For Python shell, I did this:
>
> >>> import core.fleet
> >>> f = Fleet()
> Traceback (most recent call last):
>   File "<console>", line 1, in <module>
> NameError: name 'Fleet' is not defined
>
> What am I doing wrong?
>
>
> --
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>
>


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From gandalf at shopzeus.com  Tue Sep  6 10:18:32 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 06 Sep 2011 16:18:32 +0200
Subject: Python marks an instance of my class undefined
In-Reply-To: <CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
	<CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
Message-ID: <4E662BB8.6050102@shopzeus.com>

On 2011-09-06 15:42, Kayode Odeyemi wrote:
> I was able to get this solved by calling class like this:
>
> >>> from core.fleet import Fleet
> >>> f = Fleet()
>
> Thanks to a thread from the list titled "TypeError: 'module' object is 
> not callable"
Or you can also do this:

import core.fleet # import module core.fleet under the name core.fleet
f = core.fleet.Fleet()

Please note that the import statement imports the module with the given 
name.

So for example

import x.y.z

will import the name "x.y.z". Anything that is in module "z" will be 
available through its module, that is "x.y.z".
Whenever you use "import <name>", you have to access module contents 
through "<name>".

You can change the name:

import core.fleet as c # import module core.fleet under the name c
f = c.Fleet()



From dreyemi at gmail.com  Tue Sep  6 10:32:19 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 6 Sep 2011 15:32:19 +0100
Subject: Python marks an instance of my class undefined
In-Reply-To: <4E662BB8.6050102@shopzeus.com>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
	<CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
	<4E662BB8.6050102@shopzeus.com>
Message-ID: <CAPbrmCtmwvTY1hrtphn3uj07h_XAxPubSEOVQzgjijjfT0o+eA@mail.gmail.com>

On Tue, Sep 6, 2011 at 3:18 PM, Laszlo Nagy <gandalf at shopzeus.com> wrote:

> On 2011-09-06 15:42, Kayode Odeyemi wrote:
>
>> I was able to get this solved by calling class like this:
>>
>> >>> from core.fleet import Fleet
>> >>> f = Fleet()
>>
>> Thanks to a thread from the list titled "TypeError: 'module' object is not
>> callable"
>>
> Or you can also do this:
>
> import core.fleet # import module core.fleet under the name core.fleet
> f = core.fleet.Fleet()
>
> Please note that the import statement imports the module with the given
> name.
>
> So for example
>
> import x.y.z
>
> will import the name "x.y.z". Anything that is in module "z" will be
> available through its module, that is "x.y.z".
> Whenever you use "import <name>", you have to access module contents
> through "<name>".
>
> You can change the name:
>
> import core.fleet as c # import module core.fleet under the name c
> f = c.Fleet()
>
>
That is, import [package-name] .[class-name]

If using from, that can take the form of [package-name].[pymodule] import
[pymodule] or [class-name]

I just got to understand it.

Thanks. This explanation really simplifies it further.

Can I do:

from [pymodule] import [class-name], assuming the pymodule as a class
instance?



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From fnautaNO at SPAMsolfon.nl  Tue Sep  6 10:46:17 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Tue, 6 Sep 2011 16:46:17 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net><mailman.595.1314780791.27778.python-list@python.org><9c6n4oFsnbU1@mid.individual.net><mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net>
	<mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
	<f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>
Message-ID: <9cmq1vFk6fU1@mid.individual.net>

"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:f5b9ec16-de9a-4365-81a8-860dc27a985e at d25g2000yqh.googlegroups.com...
On Sep 5, 3:51 pm, "Fokke Nauta" <fnaut... at SPAMsolfon.nl> wrote:
>
> Hi Becky,
>
> I tried it straight away:
> directory=D:\Webdav\
> directory=D:/Webdav/
>
> Didn't work, in both cases the same error "fshandler:get_data: \Webdav not
> found".
>
> I have the opinion that my WebDAV installation is at fault. The database 
> is
> not created either.
> To have set up Python, I used python-2.7.2.msi.
> To install WebDAV, I used PyWebDAV-0.9.4.1 and PyXML-0.8.4 packages, both
> Unix/Linux.
> To install the, I used
> "
>
> >> You dont install from "Python GUI", use normal cmd, navigate to the
> >> folder
> >> you downloaded PyXML and PyWebDAV and run "python setup.py install"
> >> (python.exe has to be in your PATH). Then you have to find the
> >> startup-script "davserver". Find your python installation directory and
> >> look into<Install dir>/Tools/Scripts, in my computer this is
> >> E:\python27\Tools\Scripts. PyXML and PyWebDAV get installed in the
> >> site-packages folder i.e. E:\python27\Lib/site-packages. You might have
> >> to
> >> look for "davserver" there..."
>
> Shall I re?nstall the whole lot? Would it make a difference if in that 
> case
> I would use ActivePython-2.7.2.5-win32-x86.msi instead of 
> python-2.7.2.msi?
>
> Fokke

You could try that but I'd imagine you'll end up with the same issue.
My best guess is that something is preventing os.path.isdir from
detecting the path as a directory under windows. I can't reproduce it
on my Linux system but may have a working windows installation later.
If I were you I'd fire up a python shell (execute python and get the
>>> prompt), import os.path and manually try os.path.isdir(path_name)
to try and find out what the actualy problem is.

I'm not familiar with Python, but I entered "import os.path " (nothing 
happened) and "os.path.isdir(path_name)
" in the shell. I guess what I did was not correct.
Underneath I copied what showed up in the shell.

-------------------------------------------
Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on 
win32
Type "copyright", "credits" or "license()" for more information.
>>> import os.path
>>> os.path.isdir(path_name)

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    os.path.isdir(path_name)
NameError: name 'path_name' is not defined
>>>
-------------------------------------------

Fokke 




From sinisa.segvic at fer.hr  Tue Sep  6 10:46:46 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Tue, 6 Sep 2011 07:46:46 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
Message-ID: <6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>

On 6 ruj, 13:16, Thomas Jollans <t... at jollybox.de> wrote:
> > locale.setlocale(locale.LC_ALL, (myISOCountryCode,
> > locale.getpreferredencoding()))
>
> As far as I can tell, this does work. Can you show us a traceback?

Sorry, I was imprecise.

I wanted to say that the above snippet
does not work both on Windows and Linux.

This is what I get on Windows:

>>> import sys
>>> sys.version
'3.2 (r32:88445, Feb 20 2011, 21:29:02) [MSC v.1500 32 bit (Intel)]'
>>> myISOCountryCode='hr'
>>> locale.setlocale(locale.LC_ALL, (myISOCountryCode, locale.getpreferredencoding()))
Traceback (most recent call last):
  File "<pyshell#113>", line 1, in <module>
    locale.setlocale(locale.LC_ALL, (myISOCountryCode,
locale.getpreferredencoding()))
  File "C:\apps\Python32\lib\locale.py", line 538, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

The snippet actually works on Linux, as you note.

> It looks like you don't actually care about the encoding: in your first
> example, you use the default system encoding, which you do not control,
> and in your second example, you're using two different encodings on the
> two platforms.

That's true.

That's because currently I care most about
lists of strings being sorted properly (see below).

Nevertheless, it *appears* to me that, in the Unicode era,
the locales could well be decoupled from particular encodings.
But this is another topic.

> So why do you care whether or not the default uses ISO 8859-2 ?

It's not that I care about encoding,
it's that Windows throws locale.Error at me :-)

> > My questions are the following:
>
> > 1. Is there a way for writing portable Python code dealing with
> > locales
> > ? ? (as sketched in the beginning)?
>
> > 2. If not, is there anything wrong with that idea?
>
> As I said, I believe the above code should work. It works on my Linux
> system.
>
> What are you attempting to achieve with this setting of the locale,
> without even setting the encoding? Doesn't it make more sense to simply
> use the user's usual locale, and interact with them on their own terms?

For the moment, I only wish to properly sort a Croatian text file
both on Windows and Linux (I am a cautious guy, I like reachable
goals).
When the locale is properly set, sorting works like a charm
with mylist.sort(key=locale.strxfrm).

My current solution to the portability problem is:

import locale
try:
  locale.setlocale(locale.LC_ALL, 'hr_HR.utf8')      # linux
except locale.Error:
  locale.setlocale(locale.LC_ALL, 'Croatian_Croatia.1250')    #
windows

Thanks for your feedback!

Sinisa


From hansmu at xs4all.nl  Tue Sep  6 11:12:59 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Tue, 06 Sep 2011 17:12:59 +0200
Subject: Python marks an instance of my class undefined
In-Reply-To: <mailman.802.1315318727.27778.python-list@python.org>
References: <CAPbrmCumW-mcJvsER-GQUDQUeuqmtvsH9kD2usZVWaW4pgb=hQ@mail.gmail.com>
	<CAPbrmCu0PEQgZg0DMej073p+zzfc266uZAiWQ3pt-WZiHoFafQ@mail.gmail.com>
	<mailman.802.1315318727.27778.python-list@python.org>
Message-ID: <4e66387b$0$2499$e4fe514c@news2.news.xs4all.nl>

On 6/09/11 16:18:32, Laszlo Nagy wrote:
> On 2011-09-06 15:42, Kayode Odeyemi wrote:
>> I was able to get this solved by calling class like this:
>>
>> >>> from core.fleet import Fleet
>> >>> f = Fleet()
>>
>> Thanks to a thread from the list titled "TypeError: 'module' object is
>> not callable"
> Or you can also do this:
>
> import core.fleet # import module core.fleet under the name core.fleet
> f = core.fleet.Fleet()
>
> Please note that the import statement imports the module with the given
> name.
>
> So for example
>
> import x.y.z
>
> will import the name "x.y.z". Anything that is in module "z" will be
> available through its module, that is "x.y.z".
> Whenever you use "import <name>", you have to access module contents
> through "<name>".
>
> You can change the name:
>
> import core.fleet as c # import module core.fleet under the name c
> f = c.Fleet()

An import statement always imports a module, but Python also has the
from...import statement to import one item from a module:

from core.fleet import Fleet
f = Fleet()

The convention is to use the name "Fleet" (with an initial capital)
for the class and "fleet" (all lower case) for the module.  This
makes it easier to not confuse the class and the module.

Hope this helps,

-- HansM







From sinisa.segvic at fer.hr  Tue Sep  6 11:31:59 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Tue, 6 Sep 2011 08:31:59 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.800.1315314806.27778.python-list@python.org>
Message-ID: <13b9a70f-9e40-43a3-8198-0d84c8484fb8@z18g2000yqb.googlegroups.com>

On 6 ruj, 15:13, Vlastimil Brom <vlastimil.b... at gmail.com> wrote:

> There may be some differences btween OSes end the versions, but using
> python 2.7 and 3.2 on Win XP and Win7 (Czech)
> I get the following results for setlocale:
>
> >>> locale.setlocale(locale.LC_ALL,'Croatian')
>
> 'Croatian_Croatia.1250'>>> locale.getlocale()
>
> ('Croatian_Croatia', '1250')
>
> >>> locale.getpreferredencoding(do_setlocale=False)
> 'cp1250'
>
> However, "hr" is not recognised on this systems:
>
> >>> locale.setlocale(locale.LC_ALL, "hr")
>
> Traceback (most recent call last):
> ? File "<input>", line 1, in <module>
> ? File "locale.pyc", line 531, in setlocale
> Error: unsupported locale setting

Thanks for your feedback!


So this works only on Linux (in concordance with the documentation):

locale.setlocale(locale.LC_ALL, ('croatian',
locale.getpreferredencoding()))

And this works only on Windows (incomplete locale spec probably filled
in by Windows API):

locale.setlocale(locale.LC_ALL, 'croatian')


Obviously, there is a misunderstanding between Python
which uses standard (IANA) language codes
and Windows which, as usual, have their own ways :-(


One possible solution would be to change
locale.locale_alias on Windows so that
it honors the custom Windows conventions:
 'hr' -> 'Croatian_Croatia.1250'
   instead of
 'hr' -> 'hr_HR.ISO8859-2'

In addition, locale.getpreferredencoding()
should probably be changed in order to return
valid Windows encodings ('1250' instead of 'cp1250').

Cheers,

Sinisa


From t at jollybox.de  Tue Sep  6 11:53:37 2011
From: t at jollybox.de (Thomas Jollans)
Date: Tue, 06 Sep 2011 17:53:37 +0200
Subject: Portable locale usage
In-Reply-To: <6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
Message-ID: <4E664201.1010806@jollybox.de>

On 06/09/11 16:46, ssegvic wrote:
> For the moment, I only wish to properly sort a Croatian text file
> both on Windows and Linux (I am a cautious guy, I like reachable
> goals).
> When the locale is properly set, sorting works like a charm
> with mylist.sort(key=locale.strxfrm).

The problem with that is of course that a Croatian locale has to be
installed. Many Linux systems don't have locales that aren't used.


From PointedEars at web.de  Tue Sep  6 12:07:42 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Tue, 06 Sep 2011 18:07:42 +0200
Subject: Floating point multiplication in python
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu>
Message-ID: <2204592.egLE2XKegd@PointedEars.de>

Thomas Rachel wrote:

> Now if you multiply two values with an error, the error also propagates
> into the result - PLUs the result can have its own error source - in the
> same order of magnitude.
> 
> (a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e
> or (2*a + e) * e.

Your explanation about floating-point precision, which I already knew about 
but have only scanned here ? so it might be flawed as well ?, 
notwithstanding, it is not clear to me at all what you are trying to prove 
there.

Computers (well, perhaps outside of mathematical software) do NOT compute an 
equation as humans would do, so the binomial theorem does NOT apply.  In an 
algorithm of the real implementation,

  (a + e) * (a + e)

would be computed as follows:

  b := a + e
  c := b * b
    or
  c := b + ? + b

[add the value of `b' to the value of `b' (b?1) times, since binary logic 
does not support multiplication]

IOW, the error does propagate into the result indeed, but not as you 
described.  Indeed, thanks to rounding on assignment and multiplication
(i. e., setting register values or IEEE-754 floating-point mantissa and 
exponent), the error will be different, probably greater than you compute 
here.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From josepharmbruster at gmail.com  Tue Sep  6 12:17:19 2011
From: josepharmbruster at gmail.com (Joseph Armbruster)
Date: Tue, 6 Sep 2011 12:17:19 -0400
Subject: PEP 20 - Silly Question?
Message-ID: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>

I have used Python for some time and ran a windows build-bot for a bit.
 This morning, I told a fellow developer "There should be only one obvious
way to do it." and then I proceeded to forward him to the Zen of Python and
sent him a link to:
http://www.python.org/dev/peps/pep-0020/

I noticed that it says only 19 of 20 have been written down.  Which one was
not written down?

Thank You,
Joseph Armbruster
-------------- next part --------------
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From ericsnowcurrently at gmail.com  Tue Sep  6 12:26:05 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Tue, 6 Sep 2011 10:26:05 -0600
Subject: PEP 20 - Silly Question?
In-Reply-To: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
Message-ID: <CALFfu7D-rtSLhP0Q5Un5wgM2GqQqi2K5kqmuQZb-ytL_iHFojQ@mail.gmail.com>

On Tue, Sep 6, 2011 at 10:17 AM, Joseph Armbruster
<josepharmbruster at gmail.com> wrote:
> I have used Python for some time and ran a windows build-bot for a bit.
> ?This morning, I told a fellow developer "There should be only one obvious
> way to do it." and then I proceeded to forward him to the Zen of Python and
> sent him a link to:
> http://www.python.org/dev/peps/pep-0020/
> I noticed that it says only 19 of 20 have been written down. ?Which one was
> not written down?

I'm not sure there ever was a 20th.  Apparently Tim Peters was going
to leave the last one for Guido to fill in:

http://mail.python.org/pipermail/python-list/1999-June/616160.html

(from http://www.wefearchange.org/2010/06/import-this-and-zen-of-python.html)

-eric

> Thank You,
> Joseph Armbruster
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From schesis at gmail.com  Tue Sep  6 12:27:27 2011
From: schesis at gmail.com (Zero Piraeus)
Date: Tue, 6 Sep 2011 12:27:27 -0400
Subject: PEP 20 - Silly Question?
In-Reply-To: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
Message-ID: <CANaSqUdA4o6e+jJ3RFOyye0KcALpSZD_HQ_cobi9XnqLvu=auQ@mail.gmail.com>

:

On 6 September 2011 12:17, Joseph Armbruster <josepharmbruster at gmail.com> wrote:
> I noticed that it says only 19 of 20 have been written down. ?Which one was
> not written down?

The last one.

 -[]z.


From __peter__ at web.de  Tue Sep  6 12:54:42 2011
From: __peter__ at web.de (Peter Otten)
Date: Tue, 06 Sep 2011 18:54:42 +0200
Subject: PEP 20 - Silly Question?
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
Message-ID: <j45j8h$m5o$1@dough.gmane.org>

Joseph Armbruster wrote:

> I have used Python for some time and ran a windows build-bot for a bit.
>  This morning, I told a fellow developer "There should be only one obvious
> way to do it." and then I proceeded to forward him to the Zen of Python
> and sent him a link to:
> http://www.python.org/dev/peps/pep-0020/
> 
> I noticed that it says only 19 of 20 have been written down.  Which one
> was not written down?

Whoever offers a $1 billion sponsorship to the PSF gets to decide that one.
Expect something like "Keep your baby real dry with black whole diapers".



From Tim.Arnold at sas.com  Tue Sep  6 13:18:07 2011
From: Tim.Arnold at sas.com (Tim Arnold)
Date: Tue, 06 Sep 2011 13:18:07 -0400
Subject: sqlite3 with context manager
In-Reply-To: <7dbe35af-9cc7-42a8-9288-465e542b9ea6@glegroupsg2000goo.googlegroups.com>
References: <j3r859$rnt$1@foggy.unx.sas.com>
	<7dbe35af-9cc7-42a8-9288-465e542b9ea6@glegroupsg2000goo.googlegroups.com>
Message-ID: <j45kkf$b7o$1@foggy.unx.sas.com>

On 9/3/2011 3:03 AM, Carl Banks wrote:
> On Friday, September 2, 2011 11:43:53 AM UTC-7, Tim Arnold wrote:
>> Hi,
>> I'm using the 'with' context manager for a sqlite3 connection:
>>
>> with sqlite3.connect(my.database,timeout=10) as conn:
>>               conn.execute('update config_build set datetime=?,result=?
>> where id=?',
>>                                 (datetime.datetime.now(), success,
>> self.b['id']))
>>
>> my question is what happens if the update fails? Shouldn't it throw an
>> exception?
>
> If you look at the sqlite3 syntax documentation, you'll see it has a SQL extension that allows you to specify error semantics.  It looks something like this:
>
> UPDATE OR IGNORE
> UPDATE OR FAIL
> UPDATE OR ROLLBACK
>
> I'm not sure exactly how this interacts with pysqlite3, but using one of these might help it throw exceptions when you want it to.
>
>
> Carl Banks

I see now. You can use 'update or fail' if you have the extensions built 
in: http://docs.python.org/library/sqlite3.html#f1

example of use, line 76:
http://projects.developer.nokia.com/TECwidget/browser/data/montreal/updsqlite.py?rev=7ca2ebd301ed1eff0e2c28283470db060b872cd6

For my case, however, I'll follow Ian's advice and check on the rowcount 
after the update.

thanks for the explanation and advice,
--Tim


From xnews2 at fredp.lautre.net  Tue Sep  6 14:27:41 2011
From: xnews2 at fredp.lautre.net (Fred Pacquier)
Date: 06 Sep 2011 18:27:41 GMT
Subject: Advice on how to get started with 2D-plotting ?
Message-ID: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>

Hi,

I'm a Python long-timer, but I've never had to use tools like Matplotlib & 
others before.

Now, for my work, I would need to learn the basics fast, for a one-time 
quick-n-dirty job.

This involves a graphic comparison of RFC1918 IP subnets allocation across 
several networks.

The idea is to draw parallel lines, with segments (subnets) coloured green, 
yellow or red depending on the conflicts between the networks.

What would be the simplest/fastest way of getting this done ?
(the graphic parts, the IP stuff I know how to handle)

Alternately, if someone knows of a ready-made and accessible tool that does 
just that, I'm all ears :-)

TIA,
fp


From fnautaNO at SPAMsolfon.nl  Tue Sep  6 15:26:12 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Tue, 6 Sep 2011 21:26:12 +0200
Subject: Installing WebDAV server
References: <mailman.643.1314851358.27778.python-list@python.org><9c9578F5eaU2@mid.individual.net><mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net>
	<mailman.809.1315328739.27778.python-list@python.org>
Message-ID: <9cnaekF5nfU1@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.809.1315328739.27778.python-list at python.org...
> On Tue, 6 Sep 2011 16:46:17 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>
>
>> -------------------------------------------
>> Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] 
>> on
>> win32
>> Type "copyright", "credits" or "license()" for more information.
>> >>> import os.path
>> >>> os.path.isdir(path_name)
>>
>> Traceback (most recent call last):
>>   File "<pyshell#1>", line 1, in <module>
>>     os.path.isdir(path_name)
>> NameError: name 'path_name' is not defined
>> >>>
>> -------------------------------------------
>>
> "path_name" is a placeholder -- you're supposed to put in the exact
> string(s) you have been trying in the configuration file (wrap the
> string in quotes).
>
>>>> import os.path
>>>> os.path.isdir("e:\webdav")
> False
>>>> os.mkdir("e:\webdav")
>>>> os.path.isdir("e:\webdav")
> True
>>>> os.path.isdir("e:\webdav\\")
> Traceback (  File "<interactive input>", line 1
>    os.path.isdir("e:\webdav\")
>                              ^
> SyntaxError: EOL while scanning single-quoted string
>>>> os.path.isdir("e:\webdav\\")
> True
>>>> os.path.isdir("e:\webdav/")
> True
>>>> os.path.isdir("e:/webdav/")
> True
>>>> os.path.isdir("e:/webdav")
> True
>>>> os.rmdir("e:/webdav")
>>>> os.path.isdir("e:\webdav")
> False
>>>>
>
> Note that Python itself (and the C-runtime) doesn't care if the
> separator is \ or / or even mixed; it is just the Windows command line
> that uses \ for separator and / for options. (Python, however, uses \ as
> an escape and \" is treated first, hence the need for \\" to escape the
> \ itself)

Thanks, this is clear.

This is my Python shell:

Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on 
win32
Type "copyright", "credits" or "license()" for more information.
>>> import os.path
>>> os.path.isdir("d:\webdav")
True
>>>

So Python recognizes the directory d:\webdav

This is the command shell:

D:\Python27\WebDAV\PyWebDAV\DAVServer>server.py -n -c config.ini

INFO:pywebdav:Starting up PyWebDAV server <version 0.9.4-dev>
INFO:pywebdav:chunked_http_response feature ON
INFO:pywebdav:http_request_use_iterator feature OFF
INFO:pywebdav :http_response_use_iterator feature OFF
INFO:fshandler:Initialized with D:/Webdav-http://10.0.0.140:8081/
WARNING:pywebdav:Authentication disabled!
INFO:pywebdav:Serving data from D:/Webdav
Listening on 10.0.0.140 <8081>

(here I try to login the WebDAV server with the local IE browser)

INFO:fshandler :get_data: D:\Webdav not found
server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0; 
Windows N
T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -
server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0; 
Windows N
T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -

So - I'm a bit lost now. Thinking seriously that my webdav installation is 
at fault.

Fokke





From bkasterm at gmail.com  Tue Sep  6 16:15:03 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Tue, 06 Sep 2011 14:15:03 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
Message-ID: <87obyx4ed4.fsf@gmail.com>


I build on the suggestion by rantingrick, but took it in a bit
different direction.

I now have working code that performs reasonable.  The reason for
the class lines (as opposed to just a function) is b/c font.measure
appears not that fast.  So I want to remember between different
calls to lines.count where the cutoff was, and then start looking
from there.  This one step of "optimization" was enough to make it
run reasonable on my system.

There are one important thing skipped, Tkinter.Label takes whitespace
into account.  This code does not yet.  Also I just hacked this
together as an example solution to work further from.

import Tkinter as Tk
import tkFont
import random
import sys

def genstr (j):
    rno = random.randint(4,50)
    ret_val = str(j) + ":"
    for i in range (0, rno):
        ret_val += "hello" + str(i)
    return ret_val

def gendata (lh):
    ret_val = []
    for i in range(0,lh):
        ret_val.append (genstr (i))
    return ret_val

data = gendata (100)

root = Tk.Tk()
font = tkFont.Font(family='times', size=13)

class lines:
    def __init__ (self):
        self.lastct = 1   # remember where the cutoff was last work from there

    def count (self, text, cutoff = 400):
        global font
        no_lines = 1
        start_idx = 0
        idx = self.lastct

        while True:
            if idx > len (text):
                idx = len (text)

            # shrink from guessed value
            while font.measure (text[start_idx:idx - 1]) > cutoff:
                if idx <= start_idx:
                    print "error"
                    sys.exit ()
                else:
                    idx -= 1
                    self.lastct = idx - start_idx # adjust since was too big

            # increase from guessed value (note: if first shrunk then done)
            while (idx < len (text)
                   and font.measure (text[start_idx:idx]) < cutoff):
                idx += 1
                self.lastct = idx - start_idx     # adjust since was too small

            # next line has been determined
            print "*" + text[start_idx:idx-1] + "*"
            if idx == len(text) and font.measure (text[start_idx:]) < cutoff:
                return no_lines
            elif idx == len(text):
                return no_lines + 1
            else:
                no_lines += 1
                start_idx = idx - 1
                idx = start_idx + self.lastct

lin = lines()

# for testing speed compute for all data
for i in range(0,len(data)):
    lin.count(data[i], 450)

# show only first 10
for i in range(0,min(len(data),10)):
    l = Tk.Label(root)
    l.pack()
    l['text'] = data[i]
    print i
    no = lin.count (data[i], 450)
    print "computed lines", no
    l['width'] = 50
    l['justify'] = Tk.LEFT
    l['anchor'] = 'w'
    l['wraplength'] = 450
    l['padx']=10
    l['pady'] = 5
    l['height'] = no
    l['font'] = font
    if i % 2 == 0:
        l['background'] = 'grey80'
    else:
        l['background'] = 'grey70'

root.mainloop()


From tjreedy at udel.edu  Tue Sep  6 16:49:19 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 06 Sep 2011 16:49:19 -0400
Subject: Relative seeks on string IO
In-Reply-To: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>
References: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>
Message-ID: <j46124$ujd$1@dough.gmane.org>

On 9/6/2011 3:18 AM, Pierre Quentel wrote:

> I am wondering why relative seeks fail on string IO in Python 3.2

Good question.

>      from io import StringIO
>      txt = StringIO('Favourite Worst Nightmare')
>      txt.seek(8) # no problem with absolute seek

Please post code without non-code indents, like so:

from io import StringIO
txt = StringIO('Favourite Worst Nightmare')
txt.seek(8,0) # no problem with absolute seek
txt.seek(0,1) #  0 characters from current position ok, and useless
txt.seek(-2,2) # end-relative gives error message for cur-relative

so someone can copy and paste without deleting indents.
I verified with 3.2.2 on Win7. I am curious what 2.7 and 3.1 do.

What system are you using? Does it have a narrow or wide unicode build? 
(IE, what is the value of sys.maxunicode?)

>      txt.seek(2,1) # 2 characters from current position
>
> raises "IOError: Can't do nonzero cur-relative seeks" (tested with
> Python3.2.2 on WindowsXP)
>
> A seek relative to the end of the string IO raises the same IOError

> Is there any reason why relative seeks on string IO are not allowed in
> Python3.2, or is it a bug that could be fixed in a next version ?

Since StringIO seeks by fixed-size code units (depending on the build), 
making seeking from the current position and end trivial, I consider 
this a behavior bug. At minimum, it is a doc bug. I opened
http://bugs.python.org/issue12922

As noted there, I suspect the limitation in inherited from TextIOBase. 
But I challenge that it should be.

I was somewhat surprised that seeking (from the start) is not limited to 
the existing text. Seeking past the end fills in with nulls. (They are 
typically a nuisance though.)

from io import StringIO
txt = StringIO('0123456789')
txt.seek(15,0) # no problem with absolute seek
txt.write('xxx')
s  = txt.getvalue()
print(ord(s[12]))
# 0
-- 
Terry Jan Reedy



From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Tue Sep  6 16:58:09 2011
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Tue, 6 Sep 2011 20:58:09 +0000 (UTC)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
Message-ID: <j461h0$nl2$1@speranza.aioe.org>

Thomas Jollans <t at jollybox.de> wrote:
 
> It looks like you don't actually care about the encoding: in your first
> example, you use the default system encoding, which you do not control,
> and in your second example, you're using two different encodings on the
> two platforms. So why do you care whether or not the default uses ISO
> 8859-2 ?
>

Maybe because using 8859-2 locale, (unicode) strings not representable in the
encodings will be sorted - how? 

I would care, I prefer not to have undefined behaviour.

-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From rantingrick at gmail.com  Tue Sep  6 16:59:41 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 13:59:41 -0700 (PDT)
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <27d7b2a8-1a24-4066-b603-13c935c42af1@fd21g2000vbb.googlegroups.com>

On Sep 6, 1:27?pm, Fred Pacquier <xne... at fredp.lautre.net> wrote:
> I'm a Python long-timer, but I've never had to use tools like Matplotlib &
> others before.
>
> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.

##################
## START SCRIPT ##
##################
#
# Easy_as.py
#
import Tkinter as tk
# Create a main window and a canvas.
app = tk.Tk()
can = tk.Canvas(
    app,
    width=500,
    height=500,
    #bd=1,
    #relief=tk.SOLID,
    )
can.pack(
    fill=tk.BOTH,
    expand=True,
    padx=5,
    pady=5,
    )
# Create some gridlines on the canvas.
W,H = 500, 500
row, col = 0,0
for _ in range(10):
    can.create_line(0, row, W, row, fill='red')
    print 0, row, W, row
    can.create_line(col, 0, col, H, fill='green')
    row += 50
    col += 50
can.create_line(
    0,500,300,300,
    350,200,400,450,
    fill='magenta',
    width=5,
    )
# Start the event loop.
app.mainloop()
################
## END SCRIPT ##
################

Any questions?


From rantingrick at gmail.com  Tue Sep  6 17:23:50 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 14:23:50 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
Message-ID: <8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>

Hmm, i can replace all that code with this...

#
# Easy_as.py
#
import Tkinter as tk
from ScrolledText import ScrolledText
import tkFont
import random
# Create some puesdo data.
data = [
    '{0}.{1}'.format(x, 'blah'*random.randint(4, 50))
    for x in range(100)
    ]
##print data
# Create the main window and a scrolled text widget.
root = tk.Tk()
font = tkFont.Font(family='times', size=13)
textbox = ScrolledText(
    root,
    width=60,
    height=20,
    font=('Times', 10),
    wrap=tk.WORD,
    )
textbox.pack(
    fill=tk.BOTH,
    expand=True,
    padx=5,
    pady=5,
    )
textbox.insert(1.0, '\n\n'.join(data))
# Start the event loop.
root.mainloop()
#
# End
#


From jabba.laci at gmail.com  Tue Sep  6 17:25:32 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Tue, 6 Sep 2011 17:25:32 -0400
Subject: import os or import os.path
Message-ID: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>

Hi,

If I want to use the 'os.path' module, it's enought to import 'os':

import os
if os.path.isfile('/usr/bin/bash'):
    print 'got it'

In other source codes I noticed that people write 'import os.path' in
this case. Which is better practice?

Thanks,

Laszlo


From rantingrick at gmail.com  Tue Sep  6 17:37:57 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 14:37:57 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
Message-ID: <d7f1b720-941c-4c29-92cc-94c1daa3e512@t3g2000vbe.googlegroups.com>

Or if you prefer the alternating background approach...


##################
# Easy_as.py
##################
import Tkinter as tk
from ScrolledText import ScrolledText
import tkFont
import random
END = 'end'
INSERT = 'insert'
#
# Create some puesdo data.
data = [
    '{0}.{1}'.format(x, 'blah'*random.randint(4, 50))
    for x in range(100)
    ]
##print data
#
# Create the main window and a scrolled text widget.
root = tk.Tk()
font = tkFont.Font(family='times', size=13)
textbox = ScrolledText(
    root,
    width=60,
    height=20,
    font=('Times', 10),
    wrap=tk.WORD,
    )
textbox.pack(
    fill=tk.BOTH,
    expand=True,
    padx=5,
    pady=5,
    )
#
# Add a tag to the very end of the widget and
# configure the tag only once!
textbox.tag_add('one', END)
textbox.tag_config('one', background='gray')
#
# Iterate over the lines stuffing them into the textbox.
idata = iter(data)
sidx = 1.0
while True:
    try:
        textbox.insert(END, idata.next()+"\n")
        textbox.tag_add('one', sidx, INSERT)
        textbox.insert(END, idata.next()+"\n")
        print sidx, textbox.index(END)
        sidx = textbox.index(INSERT)
    except StopIteration:
        break
#
# Start the event loop.
root.mainloop()
##################
# End
##################



From ian.g.kelly at gmail.com  Tue Sep  6 17:47:57 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Tue, 6 Sep 2011 15:47:57 -0600
Subject: import os or import os.path
In-Reply-To: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
References: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
Message-ID: <CALwzidnhfOPVPPzBqpc8P6WqwEE=QFmRufrnxf=vA2tnbThAJA@mail.gmail.com>

On Tue, Sep 6, 2011 at 3:25 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> If I want to use the 'os.path' module, it's enought to import 'os':
>
> import os
> if os.path.isfile('/usr/bin/bash'):
> ? ?print 'got it'
>
> In other source codes I noticed that people write 'import os.path' in
> this case. Which is better practice?

"import os.path" is better practice.  There is no guarantee in general
that the os module will automatically import os.path, and in future
versions or different implementations it might not.

Cheers,
Ian


From neubyr at gmail.com  Tue Sep  6 17:52:52 2011
From: neubyr at gmail.com (neubyr)
Date: Tue, 6 Sep 2011 16:52:52 -0500
Subject: MIMEText encode error - Python 2.6.6
Message-ID: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>

I am trying to write a program which can email file's content using
smtplib. I am getting following error while using Python 2.6.6
version.

{{{
File "./killed_jobs.py", line 88, in sendmail
   msg = MIMEText(ipfile.read, 'plain')
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/mime/text.py",
line 30, in __init__
   self.set_payload(_text, _charset)
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
line 224, in set_payload
   self.set_charset(charset)
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
line 266, in set_charset
   cte(self)
 File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/encoders.py",
line 73, in encode_7or8bit
   orig.encode('ascii')
AttributeError: 'builtin_function_or_method' object has no attribute 'encode'

}}}


I am referring to email examples on the doc site
http://docs.python.org/release/2.6.6/library/email-examples.html#email-examples
. Following is the msg object part in my code:

{{{
...
...
def sendmail(inputfile):
        ipfile = open(inputfile, 'r')
        msg = MIMEText(ipfile.read, 'plain')
        ipfile.close()

...
...
}}}

I have tried setting subtype and chartype separately as mentioned here
- http://docs.python.org/release/2.6.6/library/email.mime.html, but
the error remains same. Any help on what might be wrong here?

thanks,
neuby.r


From bkasterm at gmail.com  Tue Sep  6 18:00:51 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Tue, 06 Sep 2011 16:00:51 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
Message-ID: <87k49l49gs.fsf@gmail.com>

rantingrick <rantingrick at gmail.com> writes:

> Hmm, i can replace all that code with this...

Because I stupidly forgot to repeat the original problem I had, and my
code doesn't show it (and doesn't show the correct use of the function I
wrote).  The code shows that I now know how to compute the number of
lines and item will have; in the actual program I am developing I will
take the max of these numbers and make all items that height.

This means the code I should have shown is as follows (here I first
compute the maximum height needed for any item, and then show all items
using this height).  Also in the actual program there will be scrolling
options to change the item shown by the different labels.

import Tkinter as Tk
import tkFont
import random
import sys

def genstr (j):
    rno = random.randint(4,50)
    ret_val = str(j) + ":"
    for i in range (0, rno):
        ret_val += "hello" + str(i)
    return ret_val

def gendata (lh):
    ret_val = []
    for i in range(0,lh):
        ret_val.append (genstr (i))
    return ret_val

data = gendata (100)

root = Tk.Tk()
font = tkFont.Font(family='times', size=13)

class lines:
    def __init__ (self):
        self.lastct = 1   # remember where the cutoff was last work from there

    def count (self, text, cutoff = 400):
        global font
        no_lines = 1
        start_idx = 0
        idx = self.lastct

        while True:
            if idx > len (text):
                idx = len (text)

            # shrink from guessed value
            while font.measure (text[start_idx:idx - 1]) > cutoff:
                if idx <= start_idx:
                    print "error"
                    sys.exit ()
                else:
                    idx -= 1
                    self.lastct = idx - start_idx # adjust since was too big

            # increase from guessed value (note: if first shrunk then done)
            while (idx < len (text)
                   and font.measure (text[start_idx:idx]) < cutoff):
                idx += 1
                self.lastct = idx - start_idx     # adjust since was too small

            # next line has been determined
            print "*" + text[start_idx:idx-1] + "*"
            if idx == len(text) and font.measure (text[start_idx:]) < cutoff:
                return no_lines
            elif idx == len(text):
                return no_lines + 1
            else:
                no_lines += 1
                start_idx = idx - 1
                idx = start_idx + self.lastct

lin = lines()

max_ht = 0
for i in range(0,len(data)):
    ct = lin.count(data[i], 450)
    if ct > max_ht:
        max_ht = ct

for i in range(0,min(len(data),5)):
    l = Tk.Label(root)
    l.pack()
    l['text'] = data[i]
    l['width'] = 50
    l['justify'] = Tk.LEFT
    l['anchor'] = 'w'
    l['wraplength'] = 450
    l['padx']=10
    l['pady'] = 5
    l['height'] = max_ht
    l['font'] = font
    if i % 2 == 0:
        l['background'] = 'grey80'
    else:
        l['background'] = 'grey70'

root.mainloop()



>
> #
> # Easy_as.py
> #
> import Tkinter as tk
> from ScrolledText import ScrolledText
> import tkFont
> import random
> # Create some puesdo data.
> data = [
>     '{0}.{1}'.format(x, 'blah'*random.randint(4, 50))
>     for x in range(100)
>     ]
> ##print data
> # Create the main window and a scrolled text widget.
> root = tk.Tk()
> font = tkFont.Font(family='times', size=13)
> textbox = ScrolledText(
>     root,
>     width=60,
>     height=20,
>     font=('Times', 10),
>     wrap=tk.WORD,
>     )
> textbox.pack(
>     fill=tk.BOTH,
>     expand=True,
>     padx=5,
>     pady=5,
>     )
> textbox.insert(1.0, '\n\n'.join(data))
> # Start the event loop.
> root.mainloop()
> #
> # End
> #


From python at mrabarnett.plus.com  Tue Sep  6 18:05:20 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 06 Sep 2011 23:05:20 +0100
Subject: MIMEText encode error - Python 2.6.6
In-Reply-To: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>
References: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>
Message-ID: <4E669920.3010704@mrabarnett.plus.com>

On 06/09/2011 22:52, neubyr wrote:
> I am trying to write a program which can email file's content using
> smtplib. I am getting following error while using Python 2.6.6
> version.
>
> {{{
> File "./killed_jobs.py", line 88, in sendmail
>     msg = MIMEText(ipfile.read, 'plain')
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/mime/text.py",
> line 30, in __init__
>     self.set_payload(_text, _charset)
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
> line 224, in set_payload
>     self.set_charset(charset)
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
> line 266, in set_charset
>     cte(self)
>   File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/encoders.py",
> line 73, in encode_7or8bit
>     orig.encode('ascii')
> AttributeError: 'builtin_function_or_method' object has no attribute 'encode'
>
> }}}
>
>
> I am referring to email examples on the doc site
> http://docs.python.org/release/2.6.6/library/email-examples.html#email-examples
> . Following is the msg object part in my code:
>
> {{{
> ...
> ...
> def sendmail(inputfile):
>          ipfile = open(inputfile, 'r')
>          msg = MIMEText(ipfile.read, 'plain')
>          ipfile.close()
>
> ...
> ...
> }}}
>
> I have tried setting subtype and chartype separately as mentioned here
> - http://docs.python.org/release/2.6.6/library/email.mime.html, but
> the error remains same. Any help on what might be wrong here?
>
The docs say:

     MIMEText(_text[, _subtype[, _charset]])

     ... _text is the string for the payload ...

You're passing ipfile.read, which is the read method of the file. You
should be passing the string returned by calling ipfile.read, ie
ipfile.read().


From rantingrick at gmail.com  Tue Sep  6 18:40:08 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 15:40:08 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
	<87k49l49gs.fsf@gmail.com>
Message-ID: <af467c29-d1c5-4a42-b1ec-91e0afba6819@d25g2000yqh.googlegroups.com>

On Sep 6, 5:00?pm, Bart Kastermans <bkast... at gmail.com> wrote:
> rantingrick <rantingr... at gmail.com> writes:
> > Hmm, i can replace all that code with this...
>
> Because I stupidly forgot to repeat the original problem I had, and my
> code doesn't show it (and doesn't show the correct use of the function I
> wrote).

Oh NOW i see! This new code you posted is like night and day compared
to the original </sarcasm> :o)

Anyway, i did not read the code to find the difference because i want
to know why you insist on using multiple labels for this when a
scrolled text will suffice. Are you trying to create some sort of
textual "animation frames" that you can flip through on demand? If not
i would use the scrolled text (and even the scrolled text can "feel"
like animation frames whist scrolling).

Take your input data and replace ALL single newlines with null strings
(thereby preserving paragraphs) and let the textbox control the line
wrapping. The benefits are enormous using my way; your way is limited
and requires re-inventing the wheel. Tell me WHY the textbox approach
is not a viable solution and THEN i'll listen to you.

Until then; you can lead a horse to water...



From rantingrick at gmail.com  Tue Sep  6 18:43:58 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 6 Sep 2011 15:43:58 -0700 (PDT)
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
	<87k49l49gs.fsf@gmail.com>
	<af467c29-d1c5-4a42-b1ec-91e0afba6819@d25g2000yqh.googlegroups.com>
Message-ID: <700374dd-49ff-4f0a-8c22-198bff6b7b42@k15g2000yqd.googlegroups.com>

On Sep 6, 5:40?pm, rantingrick <rantingr... at gmail.com> wrote:
> On Sep 6, 5:00?pm, Bart Kastermans <bkast... at gmail.com> wrote:

> Take your input data and replace ALL single newlines with null strings

CORRECTION: Take your input data and replace ALL single newlines with
A SINGLE SPACE


From bkasterm at gmail.com  Tue Sep  6 20:33:32 2011
From: bkasterm at gmail.com (Bart Kastermans)
Date: Tue, 06 Sep 2011 18:33:32 -0600
Subject: Tkinter label height to fit content
References: <87mxelgtmx.fsf@gmail.com>
	<69ce4e11-5ef4-4b81-b66b-87d1017b1ec3@s7g2000yqk.googlegroups.com>
	<87obz0w0ze.fsf@gmail.com>
	<8d7cf6e4-5794-4f57-88ae-b0d0dcfd68a6@d25g2000yqh.googlegroups.com>
	<87obyx4ed4.fsf@gmail.com>
	<8777abed-e2b1-469e-96e5-662c535220be@y21g2000yqy.googlegroups.com>
	<87k49l49gs.fsf@gmail.com>
	<af467c29-d1c5-4a42-b1ec-91e0afba6819@d25g2000yqh.googlegroups.com>
Message-ID: <8762l5jin7.fsf@gmail.com>

rantingrick <rantingrick at gmail.com> writes:

> On Sep 6, 5:00?pm, Bart Kastermans <bkast... at gmail.com> wrote:
>> rantingrick <rantingr... at gmail.com> writes:
>> > Hmm, i can replace all that code with this...
>>
>> Because I stupidly forgot to repeat the original problem I had, and my
>> code doesn't show it (and doesn't show the correct use of the function I
>> wrote).
>
> Oh NOW i see! This new code you posted is like night and day compared
> to the original </sarcasm> :o)

Quite, I should know better (I deal with students thinking what is in
their mind should be clear to me all the time):


##############################################
# run through all the data we have, compute the maximum height
max_ht = 0
for i in range(0,len(data)):
    # lin.count is the line counting function
    ct = lin.count(data[i], 450)
    if ct > max_ht:
        max_ht = ct

for i in range(0,min(len(data),5)):
    # l is the Tkinter.Label with all formatting applied and data[i]
    # set for text
    l['height'] = max_ht    # use this maximum height for all Labels.

###############################################

Thinking on this some more, the first computation should surely be

max_ht = max (map (lambda x: lin.count(x, 450), data))


The second one could then be

labels = map (label_prepare_pack, data[:5])

where label_prepare_pack prepares (sets all attributes and data), packs,
and returns the new label.  The first (for max_ht) is a clear
improvement to me, the second (for labels) uses too many side-effects to
be very appealing to me.

> Anyway, i did not read the code to find the difference because i want
> to know why you insist on using multiple labels for this when a
> scrolled text will suffice. Are you trying to create some sort of
> textual "animation frames" that you can flip through on demand?

I don't follow precisely, but I am indeed looking to flip through all of
data while showing only 5 or 10 at a time.  The problem I wanted to
solve was that my window kept changing size while doing this.

> If not
> i would use the scrolled text (and even the scrolled text can "feel"
> like animation frames whist scrolling).
>
> Take your input data and replace ALL single newlines with null strings
> (thereby preserving paragraphs) and let the textbox control the line
> wrapping. The benefits are enormous using my way; your way is limited
> and requires re-inventing the wheel. Tell me WHY the textbox approach
> is not a viable solution and THEN i'll listen to you.

The reason I thought this, was that I didn't realize I could bind
actions to tags (to get different actions for different bits of text).
Now that I do know this I could use code like my lin.count to get the
maximum height still (to get a constant location for the i-th item as
the items are changed; more importantly to get a constant height for the
whole list of items), and then use tags to bind the corresponding
actions.

> Until then; you can lead a horse to water...

I certainly appreciate your trying.  I might not see the fresh stream
yet, but I do see liquid (possibly a shallow muddy pool, but big
progress from the dry sandy dunes before).  I will keep both approaches
in mind as I further develop.

Again, thanks for the help, greatly appreciated.


From ben+python at benfinney.id.au  Tue Sep  6 20:36:05 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 07 Sep 2011 10:36:05 +1000
Subject: PEP 20 - Silly Question?
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
Message-ID: <877h5lnq8a.fsf@benfinney.id.au>

Zero Piraeus <schesis at gmail.com> writes:

> On 6 September 2011 12:17, Joseph Armbruster <josepharmbruster at gmail.com> wrote:
> > I noticed that it says only 19 of 20 have been written down. ?Which
> > one was not written down?
>
> The last one.

I always thought it was the first one. Or the 6.25th one, I forget.

-- 
 \        ?When in doubt tell the truth. It will confound your enemies |
  `\   and astound your friends.? ?Mark Twain, _Following the Equator_ |
_o__)                                                                  |
Ben Finney


From nobody at nowhere.com  Tue Sep  6 21:01:11 2011
From: nobody at nowhere.com (Nobody)
Date: Wed, 07 Sep 2011 02:01:11 +0100
Subject: Can't use subprocess.Popen() after os.chroot() - why?
References: <b46caa73-f7a7-4154-8643-cf77b052d31e@glegroupsg2000goo.googlegroups.com>
Message-ID: <pan.2011.09.07.01.01.11.196000@nowhere.com>

On Sun, 04 Sep 2011 07:22:07 -0700, Erik wrote:

> I'm trying to do the following: 

> os.chroot("/tmp/my_chroot")
> p = Popen("/bin/date", stdin=PIPE, stdout=PIPE, stderr=PIPE)

> but the Popen call is dying with the following exception:

> LookupError: unknown encoding: string-escape
> 
> Am I missing something here? does the chroot environment need to be
> populated with more than just the date executable in this case?

Yes. It also needs to include any parts of the Python run-time which
Python will try to load while executing subsequent code. In this case, the
module which implements the string-escape encoding.

But fixing that will probably show up yet more files which need to exist
within the pseudo-root. E.g. any shared libraries which the executable
needs (probably at least libc), and any data files which those libraries
need (in the case of /bin/date, it may need /etc/timezone; many programs
may require locale data if you aren't in the "C" locale, and so on).

Whether from Python or from C, chroot() requires a good understanding of
the low-level details of your operating system. If you don't know how to
build a minimal Linux distribution from scratch, you're going to have to
learn many of those details in order to use chroot().

For any non-trivial chroot() usage, it's often easier to install a small
newlib+busybox-based Linux distribution under the pseudo-root than to try
to re-use files from and existing (presumably glibc+coreutils-based)
desktop/server distribution.



From skippy.hammond at gmail.com  Tue Sep  6 21:11:55 2011
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 07 Sep 2011 11:11:55 +1000
Subject: import os or import os.path
In-Reply-To: <CALwzidnhfOPVPPzBqpc8P6WqwEE=QFmRufrnxf=vA2tnbThAJA@mail.gmail.com>
References: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
	<CALwzidnhfOPVPPzBqpc8P6WqwEE=QFmRufrnxf=vA2tnbThAJA@mail.gmail.com>
Message-ID: <4E66C4DB.7080008@gmail.com>

On 7/09/2011 7:47 AM, Ian Kelly wrote:
> On Tue, Sep 6, 2011 at 3:25 PM, Jabba Laci<jabba.laci at gmail.com>  wrote:
>> Hi,
>>
>> If I want to use the 'os.path' module, it's enought to import 'os':
>>
>> import os
>> if os.path.isfile('/usr/bin/bash'):
>>     print 'got it'
>>
>> In other source codes I noticed that people write 'import os.path' in
>> this case. Which is better practice?
>
> "import os.path" is better practice.  There is no guarantee in general
> that the os module will automatically import os.path, and in future
> versions or different implementations it might not.

That's probably a matter of opinion - eg, 
http://docs.python.org/tutorial/interpreter.html has an example of 
importing the os module then accessing os.path.

Personally I think directly importing os.path is a waste of precious 
keystrokes ;)

Cheers,

Mark.


From python at mrabarnett.plus.com  Tue Sep  6 21:25:56 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 07 Sep 2011 02:25:56 +0100
Subject: PEP 20 - Silly Question?
In-Reply-To: <877h5lnq8a.fsf@benfinney.id.au>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
	<877h5lnq8a.fsf@benfinney.id.au>
Message-ID: <4E66C824.6010008@mrabarnett.plus.com>

On 07/09/2011 01:36, Ben Finney wrote:
> Zero Piraeus<schesis at gmail.com>  writes:
>
>> On 6 September 2011 12:17, Joseph Armbruster<josepharmbruster at gmail.com>  wrote:
>>> I noticed that it says only 19 of 20 have been written down.  Which
>>> one was not written down?
>>
>> The last one.
>
> I always thought it was the first one. Or the 6.25th one, I forget.
>
Or the zeroth one.


From milleja46 at gmail.com  Tue Sep  6 21:31:52 2011
From: milleja46 at gmail.com (Joshua Miller)
Date: Tue, 6 Sep 2011 21:31:52 -0400
Subject: PEP 20 - Silly Question?
In-Reply-To: <4E66C824.6010008@mrabarnett.plus.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
	<877h5lnq8a.fsf@benfinney.id.au>
	<4E66C824.6010008@mrabarnett.plus.com>
Message-ID: <CAKoEMEe9AFUkvn5W8GTHJs_bRO-e0dO9KJfC5HXRGyMad+PtvA@mail.gmail.com>

You sure it wasn't the invisible one? you know the one in the white
text that blends into the background?

On Tue, Sep 6, 2011 at 9:25 PM, MRAB <python at mrabarnett.plus.com> wrote:
> On 07/09/2011 01:36, Ben Finney wrote:
>>
>> Zero Piraeus<schesis at gmail.com> ?writes:
>>
>>> On 6 September 2011 12:17, Joseph Armbruster<josepharmbruster at gmail.com>
>>> ?wrote:
>>>>
>>>> I noticed that it says only 19 of 20 have been written down. ?Which
>>>> one was not written down?
>>>
>>> The last one.
>>
>> I always thought it was the first one. Or the 6.25th one, I forget.
>>
> Or the zeroth one.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tyler at tysdomain.com  Tue Sep  6 22:19:37 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Tue, 06 Sep 2011 20:19:37 -0600
Subject: Looking for open-source Python projects to help out with
Message-ID: <4E66D4B9.9050402@tysdomain.com>

Hello:
I've got a bit of time on my hands, so I'm curious what sorts of 
projects there are that people needs help with. I'd like to choose 
something that doesn't have a ton of red tape, but is stable, which is 
why I ask here instead of just Googling open source projects. My main 
interests lie in accessibility, Utilities and security.

-- 

Take care,
~Ty
Web: http://tds-solutions.net

Sent from my toaster.



From wolftracks at invalid.com  Tue Sep  6 22:43:23 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Tue, 06 Sep 2011 19:43:23 -0700
Subject: strange thing:
In-Reply-To: <mailman.794.1315297360.27778.python-list@python.org>
References: <tencent_05A7597541D14E995173354F@qq.com>
	<mailman.794.1315297360.27778.python-list@python.org>
Message-ID: <j46lpr$fb7$1@dont-email.me>

CA, Did you respond to my off-NG msg about FORTRAN? Perhaps it's caught 
in my spam on the net.


From rosuav at gmail.com  Tue Sep  6 22:48:21 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 7 Sep 2011 12:48:21 +1000
Subject: strange thing:
In-Reply-To: <j46lpr$fb7$1@dont-email.me>
References: <tencent_05A7597541D14E995173354F@qq.com>
	<mailman.794.1315297360.27778.python-list@python.org>
	<j46lpr$fb7$1@dont-email.me>
Message-ID: <CAPTjJmozE4SqUBKXg1TK9XQKQazqyX_fv2NkeMQ=uv-iYmnAsA@mail.gmail.com>

On Wed, Sep 7, 2011 at 12:43 PM, W. eWatson <wolftracks at invalid.com> wrote:
> CA, Did you respond to my off-NG msg about FORTRAN? Perhaps it's caught in
> my spam on the net.

No, I didn't; as someone else pointed out, you'll get better results
asking on a dedicated Fortran list.

ChrisA


From goon12 at gmail.com  Tue Sep  6 23:49:34 2011
From: goon12 at gmail.com (Joe Riopel)
Date: Tue, 6 Sep 2011 23:49:34 -0400
Subject: import os or import os.path
In-Reply-To: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
References: <CAOuJsM=vZL1kLgNkgpD6fC=J3APHJTN2RKLGySD9-p0JnxcpzQ@mail.gmail.com>
Message-ID: <CAHMX9+7khj4x0qe7H2ahO+2iPVPJRDs5ydXfd2XTDMPSyFYz7g@mail.gmail.com>

On Tue, Sep 6, 2011 at 5:25 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> If I want to use the 'os.path' module, it's enought to import 'os':
>
> import os
> if os.path.isfile('/usr/bin/bash'):
> ? ?print 'got it'
>
> In other source codes I noticed that people write 'import os.path' in
> this case. Which is better practice?

I just followed what the help said:

""
DESCRIPTION
    Instead of importing this module directly, import os and refer to
    this module as os.path.
""


From casevh at gmail.com  Tue Sep  6 23:58:29 2011
From: casevh at gmail.com (casevh)
Date: Tue, 6 Sep 2011 20:58:29 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
Message-ID: <6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>

On Sep 6, 6:37?am, jmfauth <wxjmfa... at gmail.com> wrote:
> This is just an attempt to put thehttp://groups.google.com/group/comp.lang.python/browse_thread/thread/...
> discussion at a correct level.
>
> With Python 2.7 a new float number representation (the David Gay's
> algorithm)
> has been introduced. If this is well honored in Python 2.7, it
> seems to me, there are some missmatches in the Py3 series.
>
> >>> sys.version
>
> '2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit
> (Intel)]'
>
> >>> 0.1
> 0.10000000000000001
> >>> print 0.1
> 0.1
> >>> 1.1 * 1.1
> 1.2100000000000002
> >>> print 1.1 * 1.1
> 1.21
> >>> print repr(1.1 * 1.1)
> 1.2100000000000002
>
> >>> sys.version
>
> 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
>
>
>
> >>> 0.1
> 0.1
> >>> print 0.1
> 0.1
> >>> 1.1 * 1.1
> 1.21
> >>> print 1.1 * 1.1
> 1.21
> >>> print repr(1.1 * 1.1)
> 1.2100000000000002
>

I tried this with the same version of Python and I get:

>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>> 1.1 * 1.1
1.2100000000000002
>>> print 1.1 * 1.1
1.21
>>> print repr(1.1 * 1.1)
1.2100000000000002
>>>

> >>> sys.version
>
> '3.1.4 (default, Jun 12 2011, 15:05:44) [MSC v.1500 32 bit (Intel)]'>>> 0.1
> 0.1
> >>> print(0.1)
> 0.1
> >>> 1.1 * 1.1
> 1.2100000000000002
> >>> print(1.1 * 1.1)
> 1.21
> >>> print(repr(1.1 * 1.1))
> 1.2100000000000002
> >>> '{:g}'.format(1.1 * 1.1)
>
> '1.21'
>
> >>> sys.version
>
> '3.2.2 (default, Sep ?4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)]'
>
> >>> 0.1
> 0.1
> >>> print(0.1)
> 0.1
> >>> 1.1 * 1.1
> 1.2100000000000002
> >>> print (1.1 * 1.1)
> 1.2100000000000002
> >>> print(repr((1.1 * 1.1)))
> 1.2100000000000002
>
> >>> '{:g}'.format(1.1 * 1.1)
> '1.21'
>

I get same results as you do for Python 3.1.4 and 3.2.2. IIRC, Python
3.2 changed (for floats) __str__ to call __repr__. That should explain
the difference between 3.1.4 and 3.2.2

Also note that 1.1 * 1.1 is not the same as 1.21.

>>> (1.1 * 1.1).as_integer_ratio()
(5449355549118301, 4503599627370496)
>>> (1.21).as_integer_ratio()
(1362338887279575, 1125899906842624)

This doesn't explain why 2.7.2 displayed a different result on your
computer. What do you get for as_integer_ratio() for (1.1 * 1.1) and
(1.21)?

casevh


> jmf



From steve+comp.lang.python at pearwood.info  Wed Sep  7 00:51:13 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 07 Sep 2011 14:51:13 +1000
Subject: Floating point multiplication in python
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu> <2204592.egLE2XKegd@PointedEars.de>
Message-ID: <4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>

On Wed, 7 Sep 2011 02:07 am Thomas 'PointedEars' Lahn wrote:

> Thomas Rachel wrote:
> 
>> Now if you multiply two values with an error, the error also propagates
>> into the result - PLUs the result can have its own error source - in the
>> same order of magnitude.
>> 
>> (a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e
>> or (2*a + e) * e.
> 
> Your explanation about floating-point precision, which I already knew
> about but have only scanned here ? so it might be flawed as well ?,
> notwithstanding, it is not clear to me at all what you are trying to prove
> there.
> 
> Computers (well, perhaps outside of mathematical software) do NOT compute
> an equation as humans would do, so the binomial theorem does NOT apply. 

I think you have misunderstood. The binomial theorem always applies. Any
time you multiply two numbers, both numbers can always be re-written as a
sum of two numbers:

10*5 = (6+4)*(2+3)

So a perfect square can always be re-written in the form where the binomial
theorem applies:

5*5 = (2+3)*(2+3)
25 = 2*2 + 2*3 + 3*2 + 3*3
25 = 4 + 6 + 6 + 9
25 = 25

The binomial theorem is not a part of the algorithm for performing
multiplication. It is part of the analysis of the errors that occur during
multiplication. The actual mechanics of how bits are flipped is irrelevant.

Any floating point number x should be considered as equal to (a+e), where a
is the number actually wanted by the user, and e the error term forced upon
the user by the use of binary floats. (If you're lucky, e=0.) Generally,
both a and e are unknown, but of course their sum is known -- it's just the
float x.

So given a float x, when you square it you get this:

Exact values: a*a = a**2

Float values: x*x = (a+e)(a+e)
                  = a**2 + 2*a*e + e**2

So the error term has increased from e to (2*a*e+e**2). It is usual to
assume that e**2 is small enough that it underflows to zero, so we have the
error term e increasing to 2*a*e as a fairly simple estimate of the new
error.


> In an algorithm of the real implementation,
> 
>   (a + e) * (a + e)
> 
> would be computed as follows:
> 
>   b := a + e
>   c := b * b
>     or
>   c := b + ? + b
> 
> [add the value of `b' to the value of `b' (b?1) times, since binary logic
> does not support multiplication]

What you probably mean to say is that binary hardware usually implements
multiplication via repeated addition.

http://en.wikipedia.org/wiki/Binary_multiplier

If you don't mean that, I can't imagine what you are trying to say.
Multiplication of numbers exists in any base, binary no less than decimal.


> IOW, the error does propagate into the result indeed, but not as you
> described.  Indeed, thanks to rounding on assignment and multiplication
> (i. e., setting register values or IEEE-754 floating-point mantissa and
> exponent), the error will be different, probably greater than you compute
> here.

There may be other sources of error, particularly when multiplying two
numbers of greatly different magnitudes, but that doesn't invalidate Thomas
Rachel's point (which is only an estimate, of course).

We can see how much error is actually there by using exact arithmetic:

Error in float 1.1:

>>> from fractions import Fraction as F
>>> >>> a = F(11, 10) 
>>> x = F.from_float(1.1)
>>> e = x - a
>>> print e
1/11258999068426240

Error in float 1.1*1.1:

>>> b = F(11, 10)**2
>>> y = F.from_float(1.1**2)
>>> f = y - b
>>> print f
21/112589990684262400

which is slightly more than double e above, and slightly less than our
estimate of 2*a*e = 11/56294995342131200

So we can conclude that, at least for 1.1**2, Python floats are more
accurate than we would expect from a simple application of the binomial
theorem. (For implementations using IEEE doubles.)


-- 
Steven



From wolftracks at invalid.com  Wed Sep  7 01:08:11 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Tue, 06 Sep 2011 22:08:11 -0700
Subject: strange thing:
In-Reply-To: <mailman.819.1315363703.27778.python-list@python.org>
References: <tencent_05A7597541D14E995173354F@qq.com>
	<mailman.794.1315297360.27778.python-list@python.org>
	<j46lpr$fb7$1@dont-email.me>
	<mailman.819.1315363703.27778.python-list@python.org>
Message-ID: <j46u9a$k0e$2@dont-email.me>

On 9/6/2011 7:48 PM, Chris Angelico wrote:
> On Wed, Sep 7, 2011 at 12:43 PM, W. eWatson<wolftracks at invalid.com>  wrote:
>> CA, Did you respond to my off-NG msg about FORTRAN? Perhaps it's caught in
>> my spam on the net.
>
> No, I didn't; as someone else pointed out, you'll get better results
> asking on a dedicated Fortran list.
>
> ChrisA
OK.


From cmpython at gmail.com  Wed Sep  7 01:56:10 2011
From: cmpython at gmail.com (CM)
Date: Tue, 6 Sep 2011 22:56:10 -0700 (PDT)
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <d0497b85-3c1f-41c9-92bf-788562815712@z18g2000yqb.googlegroups.com>

> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>
> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)

AFAIK, probably Matplotlib.  I'm not sure what
quite to imagine for your plot but below is code
that makes an attempt at (maybe) something like
you are describing, shown here:

http://www.flickr.com/photos/67254913 at N07/6123112552/in/photostream#/

There are smarter ways to do this in matplotlib, but
this is pretty quick and dirty.  I'm just plotting
lines over-top other lines.  The pic I put is the
plot as a .png, which matplotlib makes if you want,
but you can also view it in a frame that matplotlib
generates and then pan/zoom/etc...


from pylab import *

x = [1,2,3,4,5,6,7,8]
y = [2 for num in x]

#plot the parallel lines themselves in green
for num in range(6):
    y = [num for item in x]
    plot(x,y,color='g',lw='4')

#plot any conflict sections in red or yellow
#some hard data to give the idea:
x2 = [3,4]
y2 = [2 for num in x2]
x3 = [5,6,7]
y3 = [4 for num in x3]
x4 = [2,3]
y4 = [3 for num in x4]

#plot these three colored parts over the green lines
plot(x2,y2,color='r',lw='12')
plot(x3,y3,color='yellow',lw='12')
plot(x4,y4,color='r',lw='12')

pos = arange(6)
yticks(pos, ('net1', 'net2', 'net3', 'net4', 'net5', 'net6'))

show()

#-------------------------

Che


From cmpython at gmail.com  Wed Sep  7 02:00:58 2011
From: cmpython at gmail.com (CM)
Date: Tue, 6 Sep 2011 23:00:58 -0700 (PDT)
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <ee54313f-9875-4029-9ae0-02e807c1adf9@fe21g2000vbb.googlegroups.com>

On Sep 6, 2:27?pm, Fred Pacquier <xne... at fredp.lautre.net> wrote:
> Hi,
>
> I'm a Python long-timer, but I've never had to use tools like Matplotlib &
> others before.
>
> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>
> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)


> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>
> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)

One fairly simple way is with Matplotlib.  Not sure
what quite to imagine for your plot but below is code
that makes an attempt at (maybe) something like
you are describing, shown here:

http://www.flickr.com/photos/67254913 at N07/6123112552/in/photostream#/

There are fancier ways to do this in Matplotlib, but
this is pretty quick and dirty--I'm just plotting
lines over-top other lines.  The pic I put is the
plot as a .png, which matplotlib makes if you want,
but you can also view it in a frame that matplotlib
generates and then pan/zoom/etc... This is using the
pylab module, but you could also embed your plots in
a GUI if you prefer.


from pylab import *

#plot the parallel lines in green
x = [1,2,3,4,5,6,7,8]
y = [2 for num in x]
for num in range(6):
    y = [num for item in x]
    plot(x,y,color='g',lw='4')

#plot any conflict sections in red or yellow
#...some data to give the idea:
x2 = [3,4]
y2 = [2 for num in x2]
x3 = [5,6,7]
y3 = [4 for num in x3]
x4 = [2,3]
y4 = [3 for num in x4]

#plot three colored parts over the green lines
plot(x2,y2,color='r',lw='12')
plot(x3,y3,color='yellow',lw='12')
plot(x4,y4,color='r',lw='12')

#change y labels to meaningful labels
pos = arange(6)
yticks(pos, ('net1', 'net2', 'net3', 'net4', 'net5', 'net6'))

show()

#-------------------------

Che


From wxjmfauth at gmail.com  Wed Sep  7 02:32:07 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 6 Sep 2011 23:32:07 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
	<6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>
Message-ID: <6091df75-58e4-4316-8f3c-957b53c24490@dq7g2000vbb.googlegroups.com>

On 7 sep, 05:58, casevh <cas... at gmail.com> wrote:

> ...

>
> Also note that 1.1 * 1.1 is not the same as 1.21.
>
> >>> (1.1 * 1.1).as_integer_ratio()
>
> (5449355549118301, 4503599627370496)>>> (1.21).as_integer_ratio()
>
> (1362338887279575, 1125899906842624)
>
> This doesn't explain why 2.7.2 displayed a different result on your
> computer. What do you get for as_integer_ratio() for (1.1 * 1.1) and
> (1.21)?
>


Sure. I just picked up these numbers/expressions by chance. They
came to my mind following the previous discussion.

Sticking with the latest versions:


>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>> (1.1 * 1.1).as_integer_ratio()
(5449355549118301L, 4503599627370496L)
>>> (1.21).as_integer_ratio()
(1362338887279575L, 1125899906842624L)
>>>



>>> sys.version
'3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)]'
>>> (1.1 * 1.1).as_integer_ratio()
(5449355549118301, 4503599627370496)
>>> (1.21).as_integer_ratio()
(1362338887279575, 1125899906842624)
>>>


Has "long" not disappeared 2.7?
I have not the skill to dive into the machinery. I have
only some theroretical understanding and I'm a little bit
confused and have to face "there something strange
somewhere".

Test on Windows 7, 32 bits.


jmf



From mdickinson at enthought.com  Wed Sep  7 02:56:42 2011
From: mdickinson at enthought.com (Mark Dickinson)
Date: Tue, 6 Sep 2011 23:56:42 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
	<6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>
Message-ID: <6aec0187-2fa1-49ae-b2c0-fb0a10ec443c@br5g2000vbb.googlegroups.com>

On Sep 7, 4:58?am, casevh <cas... at gmail.com> wrote:
> IIRC, Python
> 3.2 changed (for floats) __str__ to call __repr__.

Yes, exactly:  str and repr of a float are identical in Python 3.2 +

I'm also puzzled by the

2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
[...]
>>> 1.1 * 1.1
1.21

in jmf's message.  Cut-and-paste typo?

--
Mark


From pierre.quentel at gmail.com  Wed Sep  7 03:00:24 2011
From: pierre.quentel at gmail.com (Pierre Quentel)
Date: Wed, 7 Sep 2011 00:00:24 -0700 (PDT)
Subject: Relative seeks on string IO
References: <48a795dc-992f-4665-9ada-60b2807fc3b8@u19g2000vbm.googlegroups.com>
	<mailman.810.1315342227.27778.python-list@python.org>
Message-ID: <30c6f7f0-b846-47a9-be49-e234a8bb8c16@e9g2000yqb.googlegroups.com>

>
> Please post code without non-code indents, like so:
>
Sorry about that. After the line "Example :" I indented the next
block, out of habit ;-)
>
> What system are you using? Does it have a narrow or wide unicode build?
> (IE, what is the value of sys.maxunicode?)
>
I use Windows XP Pro, version 2002, SP3. sys.maxunicode is 65535

I have the same behaviour with 3.1.1 and with 2.7

I don't understand why variable sized code units would cause problems.
On text file objects, read(nb) reads nb characters, regardless of the
number of bytes used to encode them, and tell() returns a position in
the text stream just after the next (unicode) character read

As for SringIO, a wrapper around file objects simulates a correct
behaviour for relative seeks :

====================
txt = "abcdef"
txt += "????? ??? ??????"
txt += "?????"
txt += "endof file"

out = open("test.txt","w",encoding="utf-8")
out.write(txt)
out.close()

fobj = open("test.txt",encoding="utf-8")
fobj.seek(3)
try:
    fobj.seek(2,1)
except IOError:
    print('raises IOError')

class _file:

    def __init__(self,file_obj):
        self.file_obj = file_obj

    def read(self,nb=None):
        if nb is None:
            return self.file_obj.read()
        else:
            return self.file_obj.read(nb)

    def seek(self,offset,whence=0):
        if whence==0:
            self.file_obj.seek(offset)
        else:
            if whence==2:
                # read till EOF
                while True:
                    buf = self.file_obj.read()
                    if not buf:
                        break
            self.file_obj.seek(self.file_obj.tell()+offset)

fobj = _file(open("test.txt",encoding="utf-8"))
fobj.seek(3)
fobj.seek(2,1)
fobj.seek(-5,2)
print(fobj.read(3))
==========================

- Pierre


From herbert.weinhandl at oeaw.ac.at  Wed Sep  7 03:14:57 2011
From: herbert.weinhandl at oeaw.ac.at (Weinhandl Herbert)
Date: Wed, 07 Sep 2011 09:14:57 +0200
Subject: Advice on how to get started with 2D-plotting ?
In-Reply-To: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
Message-ID: <4e6719f1$0$38260$3b214f66@aconews.univie.ac.at>

Am 06.09.2011 20:27, schrieb Fred Pacquier:
> Hi,
>
> I'm a Python long-timer, but I've never had to use tools like Matplotlib&
> others before.
>
> Now, for my work, I would need to learn the basics fast, for a one-time
> quick-n-dirty job.
>
> This involves a graphic comparison of RFC1918 IP subnets allocation across
> several networks.
>

maybe networkx
   http://pypi.python.org/pypi/networkx/1.5
   http://networkx.lanl.gov/
is a better solution for your problem
or
http://pypi.python.org/pypi/graphcanvas/4.0.0

> The idea is to draw parallel lines, with segments (subnets) coloured green,
> yellow or red depending on the conflicts between the networks.
>
> What would be the simplest/fastest way of getting this done ?
> (the graphic parts, the IP stuff I know how to handle)
>
> Alternately, if someone knows of a ready-made and accessible tool that does
> just that, I'm all ears :-)
>
> TIA,
> fp

hth

Herbert


From Shambhu.Rajak at kpitcummins.com  Wed Sep  7 03:25:28 2011
From: Shambhu.Rajak at kpitcummins.com (Shambhu Rajak)
Date: Wed, 7 Sep 2011 07:25:28 +0000
Subject: Prequisites required to learn Django frame work
Message-ID: <408F64D89899604FB24015E64E10490C02F3F1@KCHJEXMB02.kpit.com>

Hi,
I have been doing python development since last year, I think I should learn the famous Django frame work.

Can any one suggest what are the perquisite required to setup django on my local home machine.
Please suggest something that does not require a separate server, as this is a personal interest of mine.

Thanks,
Shambhu

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From alec.taylor6 at gmail.com  Wed Sep  7 03:39:51 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 7 Sep 2011 17:39:51 +1000
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <4E66D4B9.9050402@tysdomain.com>
References: <4E66D4B9.9050402@tysdomain.com>
Message-ID: <CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>

Hi Tyler,

I'm currently working on building a new kind of social-network for
Users-Groups, Game-Clans & Student-Groups.

Building it using DJango with Pinax.

Detailed Feature-Set (planned):
? Event management
? Conference management (including ticketing with payment-gateway integration)
? Video+Audio Conferencing of event, with online interaction
possibilitiy (great for webinars)
? Join/create/delete/list groups
? Sitewide calendar
? Sitewide feed from non-private groups
? SSO integration (facebook, twitter & linkedin)
? Wall (+feed) for each group
? Listing of who's in which group
? PM group members

I will probably be releasing it under the New BSD license, although
I'm happy to consider others given a good argument.

Interested?

On Wed, Sep 7, 2011 at 12:19 PM, Littlefield, Tyler <tyler at tysdomain.com> wrote:
> Hello:
> I've got a bit of time on my hands, so I'm curious what sorts of projects
> there are that people needs help with. I'd like to choose something that
> doesn't have a ton of red tape, but is stable, which is why I ask here
> instead of just Googling open source projects. My main interests lie in
> accessibility, Utilities and security.
>
> --
>
> Take care,
> ~Ty
> Web: http://tds-solutions.net
>
> Sent from my toaster.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From wxjmfauth at gmail.com  Wed Sep  7 04:21:20 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Wed, 7 Sep 2011 01:21:20 -0700 (PDT)
Subject: Representation of floats (-> Mark Dickinson?)
References: <2baa3e30-cfa4-4ada-b881-9f94674c5b9f@l4g2000vbv.googlegroups.com>
	<6c2f34a4-8a0a-4744-89f1-32cf1c0dee27@o9g2000vbo.googlegroups.com>
	<6aec0187-2fa1-49ae-b2c0-fb0a10ec443c@br5g2000vbb.googlegroups.com>
Message-ID: <a371591e-f61d-42f2-92dc-ec670a8d78ee@l7g2000vbz.googlegroups.com>

On 7 sep, 08:56, Mark Dickinson <mdickin... at enthought.com> wrote:
> On Sep 7, 4:58?am, casevh <cas... at gmail.com> wrote:
>
> > IIRC, Python
> > 3.2 changed (for floats) __str__ to call __repr__.
>
> Yes, exactly: ?str and repr of a float are identical in Python 3.2 +
>
> I'm also puzzled by the
>
> 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
> [...]>>> 1.1 * 1.1
>
> 1.21
>
> in jmf's message. ?Cut-and-paste typo?
>
> --
> Mark


No. But, it's *my* mistake. I'm using a modified sys.displayhook which
uses a print statement (mainly for language reason). If forgot to
reset to the initial/default state for these tests when working
with too many opened interactive interpreters.
Sorry for the noise.


>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>>
>>> 1.1 * 1.1
1.21
>>> '?l?phant'
?l?phant
>>>
>>> sys.displayhook = sys.__displayhook__
>>> 1.1 * 1.1
1.2100000000000002
>>> '?l?phant'
'\xe9l\xe9phant'
>>> sys.version
'2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
>>>

jmf


From fayaz.yusuf.khan at gmail.com  Wed Sep  7 04:32:48 2011
From: fayaz.yusuf.khan at gmail.com (Fayaz Yusuf Khan)
Date: Wed, 7 Sep 2011 14:02:48 +0530
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>
References: <4E66D4B9.9050402@tysdomain.com>
	<CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>
Message-ID: <201109071403.00915.fayaz@dexetra.com>

On Wednesday, September 07, 2011 01:09:51 PM Alec Taylor wrote:
> Hi Tyler,
> 
> I'm currently working on building a new kind of social-network for
> Users-Groups, Game-Clans & Student-Groups.
> 
> Building it using DJango with Pinax.
> 
> Detailed Feature-Set (planned):
> ? Event management
> ? Conference management (including ticketing with payment-gateway
> integration) ? Video+Audio Conferencing of event, with online interaction
> possibilitiy (great for webinars)
> ? Join/create/delete/list groups
> ? Sitewide calendar
> ? Sitewide feed from non-private groups
> ? SSO integration (facebook, twitter & linkedin)
> ? Wall (+feed) for each group
> ? Listing of who's in which group
> ? PM group members
> 
> I will probably be releasing it under the New BSD license, although
> I'm happy to consider others given a good argument.
> 
> Interested?
The project page and mailing list?

-- 
Fayaz Yusuf Khan
Cloud developer and designer
Dexetra SS, Kochi, India
fayaz.yusuf.khan_AT_gmail_DOT_com
fayaz_AT_dexetra_DOT_com
+91-9746-830-823
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From gelonida at gmail.com  Wed Sep  7 04:57:53 2011
From: gelonida at gmail.com (Gelonida N)
Date: Wed, 07 Sep 2011 10:57:53 +0200
Subject: Floating point multiplication in python
In-Reply-To: <4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.790.1315289581.27778.python-list@python.org>	<j44rre$e4c$1@r03.glglgl.eu>
	<2204592.egLE2XKegd@PointedEars.de>
	<4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j47bmi$65c$1@dough.gmane.org>

On 09/07/2011 06:51 AM, Steven D'Aprano wrote:
11258999068426240
> 
> Error in float 1.1*1.1:
> 
>>>> b = F(11, 10)**2
>>>> y = F.from_float(1.1**2)
>>>> f = y - b
>>>> print f
> 21/112589990684262400
> 
> which is slightly more than double e above, and slightly less than our
> estimate of 2*a*e = 11/56294995342131200
> 
> So we can conclude that, at least for 1.1**2, Python floats are more
> accurate than we would expect from a simple application of the binomial
> theorem. (For implementations using IEEE doubles.)


The reason why the error is different from the 2*a*e is, that we
encounter two problems.

first problem is, that x = a + e
e exists because a float does have a limited number (let's call it N) of
digits and a has an infinite amount of non zero digits in the binary format.


second problem is, that the result of the multiplication is not

(a+e) * (a+e) but a 'rounded' version of it, because the floating point
representation of the result would require about 2*N digits, whereas
only N digits will be stored in the result.

depending on the rounding which happened (up or down) the error will be
bigger or smaller than the estimated one.



From gelonida at gmail.com  Wed Sep  7 05:06:25 2011
From: gelonida at gmail.com (Gelonida N)
Date: Wed, 07 Sep 2011 11:06:25 +0200
Subject: Prequisites required to learn Django frame work
In-Reply-To: <408F64D89899604FB24015E64E10490C02F3F1@KCHJEXMB02.kpit.com>
References: <408F64D89899604FB24015E64E10490C02F3F1@KCHJEXMB02.kpit.com>
Message-ID: <j47c6i$9fg$1@dough.gmane.org>

Hi Shambhu,

On 09/07/2011 09:25 AM, Shambhu Rajak wrote:
> Hi,
> 
> I have been doing python development since last year, I think I should
> learn the famous Django frame work.
> 
>  
> 
> Can any one suggest what are the perquisite required to setup django on
> my local home machine.
> 

Just easyinstall django
This is enough for learning and midsize home grown projects not
requiring a very secure setup.

Django comes with a built in server, which is good enough for learning.
However It should not be used for deployment.

As database engine you can use sqlite3, which is also good enough for
learning.


My above mentioned setup will be working under windows and under linux.


If you want to have something with a better performance, then you have
two things to look at.

Change the data base engine to mysql or postgres.
  mysql / postgres should be installable under Windows

Use a real web server (apache / nginx with uwsgi plugins)
As an intermediate step you could instead of installing a 'real' web
server you could also use a python twisted server





From alec.taylor6 at gmail.com  Wed Sep  7 05:09:53 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 7 Sep 2011 19:09:53 +1000
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <201109071403.00915.fayaz@dexetra.com>
References: <4E66D4B9.9050402@tysdomain.com>
	<CAO+9iGfjd3JFduoRLRYGnsxS52-kRFTZQ4BZastzz2M5urYkMg@mail.gmail.com>
	<201109071403.00915.fayaz@dexetra.com>
Message-ID: <CAO+9iGckxCACkpCjwu-wMDfb32+wZ1463rUsBPqu2UOYy2NmiA@mail.gmail.com>

The project page is: http://SamuelMarks.GitHub.com/groupHub

/me is thinking a rename to "groupSwitch", thoughts?

The project is currently in planning stage. All help is appreciated.

On Wed, Sep 7, 2011 at 6:32 PM, Fayaz Yusuf Khan
<fayaz.yusuf.khan at gmail.com> wrote:
> On Wednesday, September 07, 2011 01:09:51 PM Alec Taylor wrote:
>> Hi Tyler,
>>
>> I'm currently working on building a new kind of social-network for
>> Users-Groups, Game-Clans & Student-Groups.
>>
>> Building it using DJango with Pinax.
>>
>> Detailed Feature-Set (planned):
>> ? Event management
>> ? Conference management (including ticketing with payment-gateway
>> integration) ? Video+Audio Conferencing of event, with online interaction
>> possibilitiy (great for webinars)
>> ? Join/create/delete/list groups
>> ? Sitewide calendar
>> ? Sitewide feed from non-private groups
>> ? SSO integration (facebook, twitter & linkedin)
>> ? Wall (+feed) for each group
>> ? Listing of who's in which group
>> ? PM group members
>>
>> I will probably be releasing it under the New BSD license, although
>> I'm happy to consider others given a good argument.
>>
>> Interested?
> The project page and mailing list?
>
> --
> Fayaz Yusuf Khan
> Cloud developer and designer
> Dexetra SS, Kochi, India
> fayaz.yusuf.khan_AT_gmail_DOT_com
> fayaz_AT_dexetra_DOT_com
> +91-9746-830-823
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From fnautaNO at SPAMsolfon.nl  Wed Sep  7 05:17:03 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Wed, 7 Sep 2011 11:17:03 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
Message-ID: <9cor4gFk15U1@mid.individual.net>

"Dennis Lee Bieber" <wlfraed at ix.netcom.com> wrote in message 
news:mailman.823.1315377607.27778.python-list at python.org...
> On Tue, 6 Sep 2011 21:26:12 +0200, "Fokke Nauta"
> <fnautaNO at SPAMsolfon.nl> declaimed the following in
> gmane.comp.python.general:
>

<cut>

>> (here I try to login the WebDAV server with the local IE browser)
>>
>> INFO:fshandler :get_data: D:\Webdav not found
>
> At this point my best suggestion is to study the source code of
> fshandler to see what it is doing at this moment in time (offhand, is
> there any content IN the directory to be "served"?)

There is a file indeed, in d:\Webdav

>> server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0;
>> Windows N
>> T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -
>> server - - [06/Sep/2011 21:05:35] - Mozilla/4.0 (compatible; MSIE 8.0;
>> Windows N
>> T 5.1; Trident/4.0> - "GET / HTTP/1.1" 404 -
>>
> That almost looks like something is trying to retrieve a default
> page for 404 (not found) page.
>
> To save you some time:
>
> -=-=-=-
>        if os.path.exists(path):
>            if os.path.isfile(path):
>                file_size = os.path.getsize(path)
>                if range == None:
> ## REST SNIPPED
>            else:
>                # also raise an error for collections
>                # don't know what should happen then..
>                log.info('get_data: %s not found' % path)

I have seen this part. Do I need to alter it?

> Note that at this point in the system, it is looking for a FILE, not
> a directory.
> -- 

I have re-installed Python and the setuptool, and tried the Python version 
of Active, but it did not make a difference.
So now I use the "old" Python 2.7 again. Used easy_install to install 
PyWebDAV. I now run davserver.exe from the Script directory. Still the same 
problem.
What I found, however, was that if I specify the directory from the command 
line (like davserver -D d:\Webdav -n) there is no error message as 
"INFO:fshandler :get_data: D:\Webdav not found". The browser shows still the 
404 error.
The error "INFO:fshandler :get_data: D:\Webdav not found" only occurs when I 
specify the "-c config.ini" in the command line.

I didn't expect it to be this so tricky. It looked easy to set up an 
experimental webdav server.

Fokke




From tjreedy at udel.edu  Wed Sep  7 05:37:32 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 07 Sep 2011 05:37:32 -0400
Subject: Floating point multiplication in python
In-Reply-To: <4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu> <2204592.egLE2XKegd@PointedEars.de>
	<4e66f843$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j47e2h$km6$1@dough.gmane.org>

On 9/7/2011 12:51 AM, Steven D'Aprano wrote:

> So given a float x, when you square it you get this:
>
> Exact values: a*a = a**2
>
> Float values: x*x = (a+e)(a+e)
>                    = a**2 + 2*a*e + e**2
>
> So the error term has increased from e to (2*a*e+e**2). It is usual to
> assume that e**2 is small enough that it underflows to zero, so we have the
> error term e increasing to 2*a*e as a fairly simple estimate of the new
> error.

And the relative error, which is what is often important, increases from 
e/a to 2e/a.

-- 
Terry Jan Reedy



From bex.lewis at gmail.com  Wed Sep  7 06:31:35 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Wed, 7 Sep 2011 03:31:35 -0700 (PDT)
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
Message-ID: <d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>

> I have re-installed Python and the setuptool, and tried the Python version
> of Active, but it did not make a difference.
> So now I use the "old" Python 2.7 again. Used easy_install to install
> PyWebDAV. I now run davserver.exe from the Script directory. Still the same
> problem.
> What I found, however, was that if I specify the directory from the command
> line (like davserver -D d:\Webdav -n) there is no error message as
> "INFO:fshandler :get_data: D:\Webdav not found". The browser shows still the
> 404 error.
> The error "INFO:fshandler :get_data: D:\Webdav not found" only occurs when I
> specify the "-c config.ini" in the command line.
>
> I didn't expect it to be this so tricky. It looked easy to set up an
> experimental webdav server.
>
> Fokke

How are you trying to access the webdav server? I've been hacking on
the server for several days now (unrelated reasons) and have found
that it's a little unforgiving when it comes to configuration errors.
You need to be accessing the webdav server via the correct port (I
think it's 8008 by default). If you're not doing this and something
else is running on port 80 (which is where a webdav client will go to
by default) then this would explain the 404 errors.


From sinisa.segvic at fer.hr  Wed Sep  7 06:39:14 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Wed, 7 Sep 2011 03:39:14 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
	<mailman.804.1315324373.27778.python-list@python.org>
Message-ID: <2ecebe91-9d4d-4ce9-8e0a-2efbaf026273@l4g2000vbv.googlegroups.com>

On 6 ruj, 17:53, Thomas Jollans <t... at jollybox.de> wrote:
> On 06/09/11 16:46, ssegvic wrote:
>
> > For the moment, I only wish to properly sort a Croatian text file
> > both on Windows and Linux (I am a cautious guy, I like reachable
> > goals).
> > When the locale is properly set, sorting works like a charm
> > with mylist.sort(key=locale.strxfrm).
>
> The problem with that is of course that a Croatian locale has to be
> installed. Many Linux systems don't have locales that aren't used.

It appears we did not understand each other completely.

Python locales on Linux work as advertised,
I have no problems with locales on Linux whatsoever
(yes, the Croatian locale had to be manually installed).

On the other hand, it appears that
Python locales on Windows do not work as advertised.
Consider for instance my initial example:
  locale.setlocale(locale.LC_ALL, ('hr',
locale.getpreferredencoding()))
The code above does not work on Windows even though the fine manual
says:
http://docs.python.org/py3k/library/locale.html
'''
locale.setlocale(category, locale=None)
  ...
  If (the locale) is a tuple, it is converted to a string using the
locale aliasing engine.
  ...
'''
I do not believe my troubles could be solved by installing anything,
since the OS support for Croatian apperas to be present:
  locale.setlocale(locale.LC_ALL, 'Croatian_Croatia.1250')

To conclude, it seems to me that the Windows implementation
of the locale aliasing engine has some space for improvement.

All further comments shall be greatly appreciated :-)

Cheers,

Sinisa


From sinisa.segvic at fer.hr  Wed Sep  7 07:02:18 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Wed, 7 Sep 2011 04:02:18 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<j461h0$nl2$1@speranza.aioe.org>
Message-ID: <6b6671a8-8e92-4ace-a1ed-63e900246000@gz5g2000vbb.googlegroups.com>

On 6 ruj, 22:58, garabik-news-2005... at kassiopeia.juls.savba.sk wrote:
> Thomas Jollans <t... at jollybox.de> wrote:
> > It looks like you don't actually care about the encoding: in your first
> > example, you use the default system encoding, which you do not control,
> > and in your second example, you're using two different encodings on the
> > two platforms. So why do you care whether or not the default uses ISO
> > 8859-2 ?
>
> Maybe because using 8859-2 locale, (unicode) strings not representable in the
> encodings will be sorted - how?

Exactly.

Additionally, fonts supporting 8859-2 are scarce.
My favourite fonts were never available in 8859-2.

Sinisa


From sinisa.segvic at fer.hr  Wed Sep  7 07:17:52 2011
From: sinisa.segvic at fer.hr (ssegvic)
Date: Wed, 7 Sep 2011 04:17:52 -0700 (PDT)
Subject: Portable locale usage
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
	<mailman.804.1315324373.27778.python-list@python.org>
Message-ID: <16cabd28-d195-4689-9a28-374671a030ba@gz5g2000vbb.googlegroups.com>

On 6 ruj, 17:53, Thomas Jollans <t... at jollybox.de> wrote:
> On 06/09/11 16:46, ssegvic wrote:
>
> > For the moment, I only wish to properly sort a Croatian text file
> > both on Windows and Linux (I am a cautious guy, I like reachable
> > goals).
> > When the locale is properly set, sorting works like a charm
> > with mylist.sort(key=locale.strxfrm).
>
> The problem with that is of course that a Croatian locale has to be
> installed. Many Linux systems don't have locales that aren't used.

I already concluded that on Linux there are no problems whatsoever
(the Croatian locale was kindly installed by the distribution setup).

Since my initial snippet does not work on Windows, I would conclude
that the locale aliasing engine on Windows should be improved.

Any opposing views will be appreciated :-)

For convenience, I repeat the snippet here:
import locale
locale.setlocale(locale.LC_ALL, ('hr', locale.getpreferredencoding()))

Cheers,

Sinisa


From mohammedimran107 at gmail.com  Wed Sep  7 08:49:57 2011
From: mohammedimran107 at gmail.com (mohammed imran)
Date: Wed, 7 Sep 2011 05:49:57 -0700 (PDT)
Subject: mohammedimran
Message-ID: <7d838612-c5a0-43d7-b852-4a84c35b183f@l4g2000vbz.googlegroups.com>

 http://123maza.com/65/fun564/


From t at jollybox.de  Wed Sep  7 09:15:53 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 07 Sep 2011 15:15:53 +0200
Subject: Portable locale usage
In-Reply-To: <2ecebe91-9d4d-4ce9-8e0a-2efbaf026273@l4g2000vbv.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
	<mailman.796.1315307774.27778.python-list@python.org>
	<6abee826-23f3-4d5e-948e-f2a436bf0ac0@t3g2000vbe.googlegroups.com>
	<mailman.804.1315324373.27778.python-list@python.org>
	<2ecebe91-9d4d-4ce9-8e0a-2efbaf026273@l4g2000vbv.googlegroups.com>
Message-ID: <4E676E89.4010506@jollybox.de>

On 07/09/11 12:39, ssegvic wrote:
> On 6 ruj, 17:53, Thomas Jollans <t... at jollybox.de> wrote:
>> On 06/09/11 16:46, ssegvic wrote:
>>
>>> For the moment, I only wish to properly sort a Croatian text file
>>> both on Windows and Linux (I am a cautious guy, I like reachable
>>> goals).
>>> When the locale is properly set, sorting works like a charm
>>> with mylist.sort(key=locale.strxfrm).
>>
>> The problem with that is of course that a Croatian locale has to be
>> installed. Many Linux systems don't have locales that aren't used.
> 
> It appears we did not understand each other completely.

Yes we did. I was just pointing out that your code wouldn't be portable
to systems that don't have that specific locale.


From mohammedimran107 at gmail.com  Wed Sep  7 09:27:22 2011
From: mohammedimran107 at gmail.com (mohammed imran)
Date: Wed, 7 Sep 2011 06:27:22 -0700 (PDT)
Subject: mohammedimran
Message-ID: <43cb58c7-1b7b-4e61-a53a-7eb5603396ff@et6g2000vbb.googlegroups.com>

 http://123maza.com/65/fun564/


From t at jollybox.de  Wed Sep  7 09:45:30 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 07 Sep 2011 15:45:30 +0200
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <4E66D4B9.9050402@tysdomain.com>
References: <4E66D4B9.9050402@tysdomain.com>
Message-ID: <4E67757A.6070701@jollybox.de>

On 07/09/11 04:19, Littlefield, Tyler wrote:
> Hello:
> I've got a bit of time on my hands, so I'm curious what sorts of
> projects there are that people needs help with. I'd like to choose
> something that doesn't have a ton of red tape, but is stable, which is
> why I ask here instead of just Googling open source projects. My main
> interests lie in accessibility, Utilities and security.
> 

How about Python itself? Much of the standard library is written in
Python, and there are almost certainly bugs that need fixing.



From fnautaNO at SPAMsolfon.nl  Wed Sep  7 09:52:20 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Wed, 7 Sep 2011 15:52:20 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
	<d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>
Message-ID: <9cpbddFtidU1@mid.individual.net>

"becky_lewis" <bex.lewis at gmail.com> wrote in message 
news:d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f at c29g2000yqd.googlegroups.com...
>> I have re-installed Python and the setuptool, and tried the Python 
>> version
>> of Active, but it did not make a difference.
>> So now I use the "old" Python 2.7 again. Used easy_install to install
>> PyWebDAV. I now run davserver.exe from the Script directory. Still the 
>> same
>> problem.
>> What I found, however, was that if I specify the directory from the 
>> command
>> line (like davserver -D d:\Webdav -n) there is no error message as
>> "INFO:fshandler :get_data: D:\Webdav not found". The browser shows still 
>> the
>> 404 error.
>> The error "INFO:fshandler :get_data: D:\Webdav not found" only occurs 
>> when I
>> specify the "-c config.ini" in the command line.
>>
>> I didn't expect it to be this so tricky. It looked easy to set up an
>> experimental webdav server.
>>
>> Fokke
>
> How are you trying to access the webdav server?

By IE 8 and Firefox, on the same system as well as on another system. 
Firefox doesn't show the 404 error but shows a blank screen.
I bound the davserver to the local adress of the system where it's on 
(10.0.0.140).
The port was 8081 but I changed it to 8008 as you said it's the default. No 
difference.

> I've been hacking on
> the server for several days now (unrelated reasons) and have found
> that it's a little unforgiving when it comes to configuration errors.
> You need to be accessing the webdav server via the correct port (I
> think it's 8008 by default). If you're not doing this and something
> else is running on port 80 (which is where a webdav client will go to
> by default) then this would explain the 404 errors.

I certainly use the correct IP address and port number.

Underneath is my command shell.
The 1st time I specified the config file (davserver.ini), the 2nd time I 
specified on the command line.
Here I logged in with Firefox from system XXX (replaced the name by XXX).

(Here I started the server with the the config file (davserver.ini)
D:Python27\Scripts>davserver -m -c davserver.ini
INFO:pywebdav:Starting up PyWebDAV server <version 0.9.4-dev>
INFO:pywebdav:chunked_http_response feature ON
INFO:pywebdav:http_request_use_iterator feature OFF
INFO:pywebdav:http_response_use_iterator feature OFF
INFO:DAVServer.fshandler:Initialized with d:\webdav-http://10.0.0.140:8081/
WARNING:pywebdav:Authentication disabled!
INFO:pywebdav:Serving data from d:\webdav
Listening on 10.0.0.140 <8081>

(browser logging in)

INFO:DAVServer.fshandler:get_data: d:\webdav not found
XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -

^C
D:\Python27\Scripts>INFO:pywebdav:Killed by user

(Here I started the server with command line options)
davserver -D d:\webdav -H 10.0.0.140 -P 8081 -n
WARNING:pywebdav:Authentication disabled!
Listening on 10.0.0.140 <8081>
XXX --- [07/Sep/2011 11:58:49] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
XXX --- [07/Sep/2011 11:58:54] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
Gecko/
20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -

^C
D:\Python27\Scripts>INFO:pywebdav:Killed by user 




From d_vineet at yahoo.com  Wed Sep  7 09:58:26 2011
From: d_vineet at yahoo.com (Vineet Deodhar)
Date: Wed, 7 Sep 2011 06:58:26 -0700 (PDT)
Subject: web2py
In-Reply-To: <mailman.3905.1315386400.27777.python-list@python.org>
References: <mailman.3905.1315386400.27777.python-list@python.org>
Message-ID: <1315403906.49408.YahooMailNeo@web160511.mail.bf1.yahoo.com>

>>>------------------------------------------
Hi,
I have been doing python development since last year, I think I should learn the famous Django frame work.
Can any one suggest what are the perquisite required to setup django on my local home machine.
Please suggest something that does not require a separate server, as this is a personal interest of mine. 
Thanks,
Shambhu
I'm currently working on building a new kind of social-network for
Users-Groups, Game-Clans & Student-Groups.
Building it using DJango with Pinax.
Detailed Feature-Set (planned):
? Event management
? Conference management (including ticketing with payment-gateway integration)
? Video+Audio Conferencing of event, with online interaction
possibilitiy (great for webinars)
? Join/create/delete/list groups
? Sitewide calendar
? Sitewide feed from non-private groups
? SSO integration (facebook, twitter & linkedin)
? Wall (+feed) for each group
? Listing of who's in which group
? PM group members
>>>------------------------------------------

I don't want to undermine django. It is a good framework.
But still, my advise would be to go for 'web2py'.
http://web2py.com/
It is simple yet powerful. Full stack MVC framework.
Low learning curve; simple syntax.
Good docs & community.
Everything works out of the box (including web-server, DAL, sqlite, etc)
No dependencies; plug&play.
etc. etc.
---Vineet
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From gandalf at shopzeus.com  Wed Sep  7 10:51:20 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Wed, 07 Sep 2011 16:51:20 +0200
Subject: Portable locale usage
In-Reply-To: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
References: <e4299b1f-c855-4bc9-9e61-3006172410dc@l28g2000yqh.googlegroups.com>
Message-ID: <4E6784E8.2040206@shopzeus.com>


> 1. Is there a way for writing portable Python code dealing with
> locales
>      (as sketched in the beginning)?
I usually do this at the top of my main program, before importing other 
modules:

import locale
locale.setlocale(locale.LC_ALL, '')


This is absolutely portable. The above snippet works for different 
operating systems with different default encodings. You can always setup 
some environment variable before starting up the program if you really 
have to. And yes, that setting will be OS dependent, but your program 
will still be portable.

I have no access to Croatian Windows, but I bet that the above code 
would set the locale to the correct thing on both Linux and Windows.

It would be a bad idea to set the locale from anywhere else than your 
main program anyway. There are also some notes in the docs about this ( 
http://docs.python.org/library/locale.html#locale.setlocale ):

> setlocale() 
> <http://docs.python.org/library/locale.html#locale.setlocale> is not 
> thread-safe on most systems. Applications typically start with a call of
>
> import  locale
> locale.setlocale(locale.LC_ALL,  '')
>
> This sets the locale for all categories to the user's default setting 
> (typically specified in the *LANG* environment variable). If the 
> locale is not changed thereafter, using multithreading should not 
> cause problems.
>

Why are you trying to force a specific locale to your program anyway?

   L


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From ericsnowcurrently at gmail.com  Wed Sep  7 11:12:20 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Wed, 7 Sep 2011 09:12:20 -0600
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <4E66D4B9.9050402@tysdomain.com>
References: <4E66D4B9.9050402@tysdomain.com>
Message-ID: <CALFfu7DeQKRBq-Ta3OBpG9nXF23WWeKwPBCne+_sUPR_bJKSiw@mail.gmail.com>

On Tue, Sep 6, 2011 at 8:19 PM, Littlefield, Tyler <tyler at tysdomain.com> wrote:
> Hello:
> I've got a bit of time on my hands, so I'm curious what sorts of projects
> there are that people needs help with. I'd like to choose something that
> doesn't have a ton of red tape, but is stable, which is why I ask here
> instead of just Googling open source projects. My main interests lie in
> accessibility, Utilities and security.

An interesting one that I haven't had time to help on yet is the
"extensions for unittest" project:

https://code.google.com/p/unittest-ext/issues/list

Basically it's adding an extensions framework to the stdlib unittest
module.  I'm sure Michael Foord wouldn't mind the help.  Like I said,
a very interesting project, though not directly related to
accessibility or security.

-eric

>
> --
>
> Take care,
> ~Ty
> Web: http://tds-solutions.net
>
> Sent from my toaster.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From bclark76 at gmail.com  Wed Sep  7 11:56:32 2011
From: bclark76 at gmail.com (bclark76)
Date: Wed, 7 Sep 2011 08:56:32 -0700 (PDT)
Subject: How to structure packages
Message-ID: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>

I'm learning python, and was playing with structuring packages.

Basically I want to have a package called mypackage that defines a
number of classes and functions.


so I create:

mypackage
    __init__.py
    myfunc.py
    MyClass.py


my __init__.py is blank.

my MyClass.py looks like:

import blah

class MyClass(blahblah):
    blah
    blah
    blah


then I have a run.py that looks like

from mypackage import MyClass


x = MyClass()


This doesn't work because MyClass is mypackage.MyClass.MyClass.
There's this MyClass module 'in the way'.


I'm trying to follow the rule that every file defines only one class.
I could define MyClass in __init__.py, but then what if I wanted to
define more classes in the mypackage package? My one class per file
rule goes out the window.

Is this rule wrongheaded, or is there another way to do this?


Thanks.



From alec.taylor6 at gmail.com  Wed Sep  7 12:09:41 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 8 Sep 2011 02:09:41 +1000
Subject: Looking for open-source Python projects to help out with
In-Reply-To: <CALFfu7DeQKRBq-Ta3OBpG9nXF23WWeKwPBCne+_sUPR_bJKSiw@mail.gmail.com>
References: <4E66D4B9.9050402@tysdomain.com>
	<CALFfu7DeQKRBq-Ta3OBpG9nXF23WWeKwPBCne+_sUPR_bJKSiw@mail.gmail.com>
Message-ID: <CAO+9iGdaezjnO+V7Pgvw4CRdybqkPQJGSX3t-L8NpbN1s_7Wqw@mail.gmail.com>

Accessibility?

Hmm, you could look at
http://groups.google.com/group/django-users/browse_thread/thread/44a4dbf8771e0f4f
(https://groups.google.com/forum/#!topic/django-users/RKTb-HceD08)

On Thu, Sep 8, 2011 at 1:12 AM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
> On Tue, Sep 6, 2011 at 8:19 PM, Littlefield, Tyler <tyler at tysdomain.com> wrote:
>> Hello:
>> I've got a bit of time on my hands, so I'm curious what sorts of projects
>> there are that people needs help with. I'd like to choose something that
>> doesn't have a ton of red tape, but is stable, which is why I ask here
>> instead of just Googling open source projects. My main interests lie in
>> accessibility, Utilities and security.
>
> An interesting one that I haven't had time to help on yet is the
> "extensions for unittest" project:
>
> https://code.google.com/p/unittest-ext/issues/list
>
> Basically it's adding an extensions framework to the stdlib unittest
> module. ?I'm sure Michael Foord wouldn't mind the help. ?Like I said,
> a very interesting project, though not directly related to
> accessibility or security.
>
> -eric
>
>>
>> --
>>
>> Take care,
>> ~Ty
>> Web: http://tds-solutions.net
>>
>> Sent from my toaster.
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From gordon at panix.com  Wed Sep  7 12:11:11 2011
From: gordon at panix.com (John Gordon)
Date: Wed, 7 Sep 2011 16:11:11 +0000 (UTC)
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <j4852v$q77$1@reader1.panix.com>

In <2a4f542c-a8c1-46c7-9899-a3fad0940cf6 at x11g2000yqc.googlegroups.com> bclark76 <bclark76 at gmail.com> writes:

> mypackage
>     __init__.py
>     myfunc.py
>     MyClass.py

> from mypackage import MyClass

Try this instead:

  from mypackage.MyClass import MyClass

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From rafadurancastaneda at gmail.com  Wed Sep  7 13:18:43 2011
From: rafadurancastaneda at gmail.com (=?ISO-8859-1?Q?Rafael_Dur=E1n_Casta=F1eda?=)
Date: Wed, 07 Sep 2011 19:18:43 +0200
Subject: How to structure packages
In-Reply-To: <j4852v$q77$1@reader1.panix.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<j4852v$q77$1@reader1.panix.com>
Message-ID: <4E67A773.6070304@gmail.com>

Check python pep8: http://www.python.org/dev/peps/pep-0008/

And you will see than you shouldn't named modules as you did, so you 
should do something like:

mypackage
     __init__.py
     mymodule
     ...

mypackage.mymodule.MyClass

On 07/09/11 18:11, John Gordon wrote:
> In<2a4f542c-a8c1-46c7-9899-a3fad0940cf6 at x11g2000yqc.googlegroups.com>  bclark76<bclark76 at gmail.com>  writes:
>
>> mypackage
>>      __init__.py
>>      myfunc.py
>>      MyClass.py
>> from mypackage import MyClass
> Try this instead:
>
>    from mypackage.MyClass import MyClass
>



From __peter__ at web.de  Wed Sep  7 13:30:34 2011
From: __peter__ at web.de (Peter Otten)
Date: Wed, 07 Sep 2011 19:30:34 +0200
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <j489np$4c6$1@dough.gmane.org>

bclark76 wrote:

> I'm learning python, and was playing with structuring packages.

If you are coming from Jave you have to unlearn a thing or two.
 
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.

> I'm trying to follow the rule that every file defines only one class.
> I could define MyClass in __init__.py, but then what if I wanted to
> define more classes in the mypackage package? My one class per file
> rule goes out the window.
> 
> Is this rule wrongheaded, 

Yes. 

> or is there another way to do this?

I recommend that you always start out with a module. Once that becomes 
unwieldy you can convert it into a package. Let's assume that

mystuff.py

contains a MyClass that you want to move into a separate file. You get the 
following files:

mystuff
    __init__.py
    descriptivename.py # MyClass here

Note that all filenames are lowercase. If you add the line

from .descriptivename import MyClass

to __init__.py you can continue to import and use MyClass with the statement

from mystuff import MyClass
m = MyClass()

or

import mystuff
m = mystuff.MyClass()

The disadvantage is of course that mystuff.descriptivename will always be 
imported, even if you don't need the part of the mystuff package defined 
there.

You may also have a look into unittest as an example of a module that was 
recently converted into a package. Classes and functions are grouped into 
submodules by their functionality rather than employing Java's mechanical 
one-class-per-file pattern.




From rantingrick at gmail.com  Wed Sep  7 13:56:53 2011
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 7 Sep 2011 10:56:53 -0700 (PDT)
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <d670a1ae-747c-4e89-9833-698b2ef30fc9@q8g2000yqe.googlegroups.com>

On Sep 7, 10:56?am, bclark76 <bclar... at gmail.com> wrote:
> I'm learning python, and was playing with structuring packages.
>
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.
>
> so I create:
>
> mypackage
> ? ? __init__.py
> ? ? myfunc.py
> ? ? MyClass.py

Don't tell me you create a module called myfunc.py??? Stuff that
function in __init__! Also don't name modules MyClass either. Both the
spelling and grammar is incorrect. ALL modules use lowercase (and only
integrate underscores in the most dire of need!)

geom
   __init__.py
   vector3d.py
   point3d.py
   transformation.py

from geom.transformation import Transformation
from geom.vector3d import Vector3d
from geom.point3d import Point3d

or alternatively:

geom
   __init__.py
       from __vector3d import Vector3d
       from __point3d import Point3d
       from __transformation import Transformation
   __vector3d.py
   __point3d.py
   __transformation.py

from geom import Transformation
from geom import Vector3d
from geom import Point3d

Although this method can be brittle due to the fact that one buggy
module can break all the imported code in the __init__ module. I
usually opt for specifying the module in the import path.


From tyler at tysdomain.com  Wed Sep  7 14:11:23 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Wed, 07 Sep 2011 12:11:23 -0600
Subject: How to structure packages
In-Reply-To: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <4E67B3CB.8020600@tysdomain.com>

On 9/7/2011 9:56 AM, bclark76 wrote:
> I'm learning python, and was playing with structuring packages.
>
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.
>
>
> so I create:
>
> mypackage
>      __init__.py
>      myfunc.py
>      MyClass.py
>
>
> my __init__.py is blank.
>
> my MyClass.py looks like:
>
> import blah
>
> class MyClass(blahblah):
>      blah
>      blah
>      blah
>
>
> then I have a run.py that looks like
>
> from mypackage import MyClass
>
>
> x = MyClass()
>
>
> This doesn't work because MyClass is mypackage.MyClass.MyClass.
> There's this MyClass module 'in the way'.
>
You can use the __init__.py to promote that class up. so:
from myclass import myclass
So that means that myclass will just be in mypackage.myclass, and thus 
your from mypackage import myclass would work perfectly. I'm not sure if 
this is how you're supposed to do it, but it works.

> I'm trying to follow the rule that every file defines only one class.
> I could define MyClass in __init__.py, but then what if I wanted to
> define more classes in the mypackage package? My one class per file
> rule goes out the window.
>
> Is this rule wrongheaded, or is there another way to do this?
>
>
> Thanks.
>


-- 

Take care,
Ty
Web: http://tds-solutions.net

Sent from my toaster.



From emile at fenx.com  Wed Sep  7 14:21:22 2011
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 07 Sep 2011 11:21:22 -0700
Subject: PEP 20 - Silly Question?
In-Reply-To: <CAKoEMEe9AFUkvn5W8GTHJs_bRO-e0dO9KJfC5HXRGyMad+PtvA@mail.gmail.com>
References: <CADkz4c-4ze=-r8ZmiMCWY+B=5ZnC1fvaevgPK0WwEkLyGOAF4g@mail.gmail.com>
	<mailman.807.1315326451.27778.python-list@python.org>
	<877h5lnq8a.fsf@benfinney.id.au>
	<4E66C824.6010008@mrabarnett.plus.com>
	<CAKoEMEe9AFUkvn5W8GTHJs_bRO-e0dO9KJfC5HXRGyMad+PtvA@mail.gmail.com>
Message-ID: <j48cjd$pc5$1@dough.gmane.org>

On 9/6/2011 6:31 PM Joshua Miller said...
> You sure it wasn't the invisible one? you know the one in the white
> text that blends into the background?

Aah!  So _that's_ significant whitespace!

:)

Emile




From xnews2 at fredp.lautre.net  Wed Sep  7 14:24:29 2011
From: xnews2 at fredp.lautre.net (Fred Pacquier)
Date: 07 Sep 2011 18:24:29 GMT
Subject: Advice on how to get started with 2D-plotting ?
References: <Xns9F58D020011D0PaCmAnRDLM@212.27.60.38>
	<4e6719f1$0$38260$3b214f66@aconews.univie.ac.at>
Message-ID: <Xns9F59CF99ADCBFPaCmAnRDLM@212.27.60.39>

Wow, what an impressive turnout !

Thanks a lot, rantingrick, CM and Herbert, for the fast answers, useful 
tips and especially the sample code !

Beats starting from a blank page, with a big stick, and will certainly set 
me on my way much faster...

networkx does seem a bit over the top for my simple goal, but both the Tk 
(I always forget Tk !) and Matplotlib approaches seem to fit the KISS 
principle just fine... on to the tinkering now :-)

Again, thanks to all !
fp


From ssegvic at zemris.fer.hr  Wed Sep  7 14:33:57 2011
From: ssegvic at zemris.fer.hr (=?utf-8?Q?Sini=C5=A1a_=C5=A0egvi=C4=87?=)
Date: Wed, 7 Sep 2011 20:33:57 +0200 (CEST)
Subject: Portable locale usage
In-Reply-To: <4E6784E8.2040206@shopzeus.com>
Message-ID: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>

> From: "Laszlo Nagy" <gandalf at shopzeus.com>
> To: "ssegvic" <sinisa.segvic at fer.hr>, python-list at python.org
> Sent: Wednesday, September 7, 2011 4:51:20 PM
> Subject: Re: Portable locale usage
> > 1. Is there a way for writing portable Python code dealing with
> > locales (as sketched in the beginning)?
> I usually do this at the top of my main program, before importing
> other modules:
> 
> import locale
> locale.setlocale(locale.LC_ALL, '')

I have set the system-wide locale to Croatian (Croatia) 
on my development system as instructed by:
http://windows.microsoft.com/en-US/windows-vista/Change-the-system-locale

Nevertheless, your proposal produces: 
('English_United States','1252')

Note that I would very much like 
to avoid changing the system locale
(this requires Administrator password and system restart).

Setting the locale for my program only would be interesting,
but AFAIK this can not be done on Windows (?).

> Why are you trying to force a specific locale to your program anyway?

Because I wish to be able to correctly sort Croatian names.

I expect that most of my Windows users will not care 
to configure their computers with the national locale 
(and besides, that does not seem to work, anyway).

Cheers,

Sinisa


From jenn.duerr at gmail.com  Wed Sep  7 15:33:03 2011
From: jenn.duerr at gmail.com (noydb)
Date: Wed, 7 Sep 2011 12:33:03 -0700 (PDT)
Subject: Adding a ranking based on two fields
References: <9b98790e-f482-48f9-93e9-80b32f6b4583@g31g2000yqh.googlegroups.com>
	<mailman.425.1314305617.27778.python-list@python.org>
Message-ID: <0fa8fa0d-51e7-4185-aa37-3bbf358f396b@a12g2000yqi.googlegroups.com>

On Aug 25, 4:53?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Aug 25, 2011 at 1:38 PM, noydb <jenn.du... at gmail.com> wrote:
> > Hello All,
>
> > Looking for some advice/ideas on how to implement arankingto a
> > 'scores' field I have. ?So this scores field has values ranging from
> > 1.00-4. ?There is also a count field. ?I want to add a rank field such
> > that all the records have a uniqueranking, 1 through the number of
> > records (thousands). ?The rank isbasedon the score first, the count
> > second. ?So, a record with a score of 4 and a count of 385 is ranked
> > higher than a record with a score of 4 and a count of 213 AND higher
> > than record with a score of 3.25 with a count of 4640.
>
> > My thought was to add the unique score values to a list and loop thru
> > the list... sort records with score=listItem, addranking... not quite
> > sure how to do this!
>
> things = getListOfYourThings()
> things.sort(reverse=True, key=lambda item: (item.score, item.count))
> for i, thing in enumerate(things):
> ? ? thing.rank = i + 1
>
> Cheers,
> Chris
> --http://rebertia.com

Thanks for this!

Someone passed this along, too - helpful
http://wiki.python.org/moin/HowTo/Sorting


From neubyr at gmail.com  Wed Sep  7 15:58:05 2011
From: neubyr at gmail.com (neubyr)
Date: Wed, 7 Sep 2011 14:58:05 -0500
Subject: MIMEText encode error - Python 2.6.6
In-Reply-To: <4E669920.3010704@mrabarnett.plus.com>
References: <CALFxCvw3bYC9ipro3u_v-iFFL=Cct7Lc+YBYiWa886Z6pMFz5g@mail.gmail.com>
	<4E669920.3010704@mrabarnett.plus.com>
Message-ID: <CALFxCvzBAPbX+A5_urAOOKZfWz1dHVVrc3UrAwXKxC24WeAg7A@mail.gmail.com>

On Tue, Sep 6, 2011 at 5:05 PM, MRAB <python at mrabarnett.plus.com> wrote:
> On 06/09/2011 22:52, neubyr wrote:
>>
>> I am trying to write a program which can email file's content using
>> smtplib. I am getting following error while using Python 2.6.6
>> version.
>>
>> {{{
>> File "./killed_jobs.py", line 88, in sendmail
>> ? ?msg = MIMEText(ipfile.read, 'plain')
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/mime/text.py",
>> line 30, in __init__
>> ? ?self.set_payload(_text, _charset)
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
>> line 224, in set_payload
>> ? ?self.set_charset(charset)
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/message.py",
>> line 266, in set_charset
>> ? ?cte(self)
>> ?File "/home/ssp/sge/python/2.6.6/lib/python2.6/email/encoders.py",
>> line 73, in encode_7or8bit
>> ? ?orig.encode('ascii')
>> AttributeError: 'builtin_function_or_method' object has no attribute
>> 'encode'
>>
>> }}}
>>
>>
>> I am referring to email examples on the doc site
>>
>> http://docs.python.org/release/2.6.6/library/email-examples.html#email-examples
>> . Following is the msg object part in my code:
>>
>> {{{
>> ...
>> ...
>> def sendmail(inputfile):
>> ? ? ? ? ipfile = open(inputfile, 'r')
>> ? ? ? ? msg = MIMEText(ipfile.read, 'plain')
>> ? ? ? ? ipfile.close()
>>
>> ...
>> ...
>> }}}
>>
>> I have tried setting subtype and chartype separately as mentioned here
>> - http://docs.python.org/release/2.6.6/library/email.mime.html, but
>> the error remains same. Any help on what might be wrong here?
>>
> The docs say:
>
> ? ?MIMEText(_text[, _subtype[, _charset]])
>
> ? ?... _text is the string for the payload ...
>
> You're passing ipfile.read, which is the read method of the file. You
> should be passing the string returned by calling ipfile.read, ie
> ipfile.read().
> --
>

thanks got pointing that..

--


From t at jollybox.de  Wed Sep  7 17:14:26 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 07 Sep 2011 23:14:26 +0200
Subject: Portable locale usage
In-Reply-To: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
References: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
Message-ID: <4E67DEB2.5060003@jollybox.de>

On 07/09/11 20:33, Sini?a ?egvi? wrote:
> I expect that most of my Windows users will not care 
> to configure their computers with the national locale 
> (and besides, that does not seem to work, anyway).

Are, on Windows, the default system region/language setting, and the
locale, distinct? (And, if so, why?!)


From anikom15 at gmail.com  Wed Sep  7 17:35:25 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 7 Sep 2011 14:35:25 -0700
Subject: How to structure packages
In-Reply-To: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
Message-ID: <20110907213525.GA6955@Smoke>

First of all MyClass.py should be renamed to myclass.py.  Module names
should be lowercase.  Secondly, put this in __init__.py:

    from .myclass import MyClass

and there you go.

On Wed, Sep 07, 2011 at 08:56:32AM -0700, bclark76 wrote:
> I'm learning python, and was playing with structuring packages.
> 
> Basically I want to have a package called mypackage that defines a
> number of classes and functions.
> 
> 
> so I create:
> 
> mypackage
>     __init__.py
>     myfunc.py
>     MyClass.py
> 
> 
> my __init__.py is blank.
> 
> my MyClass.py looks like:
> 
> import blah
> 
> class MyClass(blahblah):
>     blah
>     blah
>     blah
> 
> 
> then I have a run.py that looks like
> 
> from mypackage import MyClass
> 
> 
> x = MyClass()
> 
> 
> This doesn't work because MyClass is mypackage.MyClass.MyClass.
> There's this MyClass module 'in the way'.
> 
> 
> I'm trying to follow the rule that every file defines only one class.
> I could define MyClass in __init__.py, but then what if I wanted to
> define more classes in the mypackage package? My one class per file
> rule goes out the window.
> 
> Is this rule wrongheaded, or is there another way to do this?
> 
> 
> Thanks.
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list


From laurent.payot at gmail.com  Wed Sep  7 17:35:41 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 14:35:41 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
Message-ID: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>

Hi there,

What is the simplest way to check that you are at the beginning or at the end of an iterable? I'm using enumerate with Python 3.2 (see below) but I'm wondering if there would be a better way.


l = ['a', 'b', 'a', 'c']

for pos, i in enumerate(l):
    if pos == 0:
        print("head =", i)
    else:
        print(i)


I know that Python is not exactly a functional language but wouldn't something like "ishead()" or "istail()" be useful?



From cs at zip.com.au  Wed Sep  7 18:48:24 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Thu, 8 Sep 2011 08:48:24 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
Message-ID: <20110907224824.GA29885@cskk.homeip.net>

On 07Sep2011 14:35, Laurent <laurent.payot at gmail.com> wrote:
| What is the simplest way to check that you are at the beginning or at
| the end of an iterable? I'm using enumerate with Python 3.2 (see below)
| but I'm wondering if there would be a better way.
| 
| l = ['a', 'b', 'a', 'c']
| 
| for pos, i in enumerate(l):
|     if pos == 0:
|         print("head =", i)
|     else:
|         print(i)
| 
| I know that Python is not exactly a functional language but wouldn't
| something like "ishead()" or "istail()" be useful?

There are a few reasons these do not exist out of the box (quite aside
from how easy it is to do on the occasions you actually want it).
Tackling ishead and istail in turn...

The "ishead()" would need to be a top level function (like "len()")
because if it were an iterator method, every iterator would need to have
it implemented; currently the number of methods needed to roll your own
iterator is just two (iter and next). ishead() could be done as a top
level function, though it would need the storage cost of an additional
state value to every iterator (i.e. a "first" boolean or equivalent). So
you'd be proposing more memory cost and possibly a retrospective code
change for all the existing planetwide code, for a minor convenient. As
you note, enumerate gets you a pos value, and it is easy enough to write
a for loop like this:

  first = True
  for i in iterable_thing:
    if first:
      print "head =", i
    else:
      print i
    first = False

Your istail() is much worse.

A generator would need to do lookahead to answer istail() in the general
case. Consider iterating over the lines in a file, or better still the
lines coming from a pipeline. Or iteraing over packets received on a
network connection. You can't answer "istail()" there until you have
seen the next line/packet (or EOF/connection close). And that may be an
arbitrary amount of time in the future. You're going to stall your whole
program for such a question?

You can do this easily enough for yourself as an itertools-like thing:
write a wrapper generator that answers ishead() and istail() for
arbitrary iterators. Completely untested example code:

  class BoundSensitiveIterator(object):
    def __init__(self, subiter):
      self.sofar = 0
      self.subiter = subiter
      self.pending = ()
    def iter(self):
      return self
    def next(self):
      self.sofar += 1
      if self.pending is None:
        raise StopIteration
      if self.pending:
        nxt = self.pending[0]
        self.pending = ()
        return nxt
      return self.subiter.next()
    def ishead(self):
      # maybe <= 1, depending on what you want it to mean
      return self.sofar == 1
    def istail(self):
      if self.pending is None:
        return True
      if self.pending:
        return False
      try:
        nxt = self.subiter.next()
      except StopIteration:
        self.pending = None
        return True
      else:
        self.pending = (nxt,)
        return False

  I = BoundSensitiveIterator(other_iterable)
  for n in I:
    print n, "ishead =", I.ishead(), "istail =", I.istail()

You can see it adds some performance and storage overhead, and of course
may stall if you every ask istail() of an "on demand" iterable.

About the only time I do this is my personal "the()" convenience
function:

  def the(list, context=None):
    ''' Returns the first element of an iterable, but requires there to be
        exactly one.
    '''
    icontext="expected exactly one value"
    if context is not None:
      icontext=icontext+" for "+context

    first=True
    for elem in list:
      if first:
        it=elem
        first=False
      else:
        raise IndexError, "%s: got more than one element (%s, %s, ...)" \
                          % (icontext, it, elem)

    if first:
      raise IndexError, "%s: got no elements" % icontext
      
    return it

Which I use as a definite article in places where an iterable _should_
yield exactly one result (eg SQL SELECTs that _ought_ to get exactly
one hit). I can see I wrote that a long time ago - it could do with some
style fixes. And a code scan shows it sees little use:-)

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Electronic cardboard blurs the line between printed objects and the virtual
world.  - overhead by WIRED at the Intelligent Printing conference Oct2006


From piet at vanoostrum.org  Wed Sep  7 18:52:20 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 00:52:20 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
	<f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>
	<9cmq1vFk6fU1@mid.individual.net>
	<mailman.809.1315328739.27778.python-list@python.org>
	<9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
	<d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>
	<9cpbddFtidU1@mid.individual.net>
Message-ID: <m2zkigartn.fsf@cochabamba.vanoostrum.org>

"Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:


> INFO:DAVServer.fshandler:get_data: d:\webdav not found
> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1> 
> Gecko/
> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1> 
> Gecko/
> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>
>From the log it looks like you are trying to access the server with the
url:

http://localhost:8008/ or something similar. 

This won't work as you would try to access the root of your webdav
directory in this way (i.e. D:/webdav). The webdav server can only serve
files, not directories, so you would have to access
http://localhost:8008/somefile.txt where somefile.txt is a file in
D:/webdav.

This only applies to acces using a browser. If you access the server
through a webdav-aware client (for example the Finder on Mac OS X, or
probably the Windows Explorer) it can serve the contents of the directory.
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From martin.rixham at gmail.com  Wed Sep  7 18:57:04 2011
From: martin.rixham at gmail.com (Martin Rixham)
Date: Wed, 7 Sep 2011 23:57:04 +0100
Subject: I am confused by
Message-ID: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>

Hi all
I would appreciate some help understanding something. Basically I am
confused by the following:

>>> a = [[0, 0], [0, 0]]
>>> b = list(a)
>>> b[0][0] = 1
>>> a
[[1, 0], [0, 0]]

I expected the last line to be

[[0, 0], [0, 0]]

I hope that's clear enough.

Martin
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From piet at vanoostrum.org  Wed Sep  7 19:01:07 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 01:01:07 +0200
Subject: Why do class methods always need 'self' as the first parameter?
References: <0dc26f12-2541-4d41-8678-4fa53f347acf@g9g2000yqb.googlegroups.com>
	<j3lnlf$8eu$1@dough.gmane.org>
	<mailman.619.1314810786.27778.python-list@python.org>
Message-ID: <m2vct4arf0.fsf@cochabamba.vanoostrum.org>

"Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:

> It seems to me that if I add a function to the list of class attributes it will automatically wrap with "self" but adding it to the object directly will not wrap the function as a method. Can somebody explain why? I would have thought that any function added to an object would be a method (unless decorated as a class method). 

The special magic to transform a function into a method is only applied
for functions found as attributes of the class, not for instance
attributes. It is a matter of design.

> Hmm, or does the decoration just tell Python not to turn an object's function into a method? I.e. Is the decorator basically just the syntactic sugar for doing the above?

The classmethod decorator transforms the method (or actually the
function) into a different kind of object (a class method). 
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From laurent.payot at gmail.com  Wed Sep  7 19:22:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 16:22:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.849.1315435715.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
Message-ID: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>

I totally understand the performance issue that an hypothetical "istail" would bring, even if I think it would just be the programmer's responsibility not to use it when it's not certain that an end can be detected. 
But I don't see why *adding* something like "ishead" would be so bad (at worse by using a boolean somewhere as you mentioned).

Anyway I was just asking if there is something better than enumerate. So the answer is no? The fact that I have to create a tuple with an incrementing integer for something as simple as checking that I'm at the head just sounds awfully unpythonic to me.


From laurent.payot at gmail.com  Wed Sep  7 19:22:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 16:22:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.849.1315435715.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
Message-ID: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>

I totally understand the performance issue that an hypothetical "istail" would bring, even if I think it would just be the programmer's responsibility not to use it when it's not certain that an end can be detected. 
But I don't see why *adding* something like "ishead" would be so bad (at worse by using a boolean somewhere as you mentioned).

Anyway I was just asking if there is something better than enumerate. So the answer is no? The fact that I have to create a tuple with an incrementing integer for something as simple as checking that I'm at the head just sounds awfully unpythonic to me.


From fnautaNO at SPAMsolfon.nl  Wed Sep  7 19:28:03 2011
From: fnautaNO at SPAMsolfon.nl (Fokke Nauta)
Date: Thu, 8 Sep 2011 01:28:03 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net><mailman.823.1315377607.27778.python-list@python.org><9cor4gFk15U1@mid.individual.net><d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com><9cpbddFtidU1@mid.individual.net>
	<m2zkigartn.fsf@cochabamba.vanoostrum.org>
Message-ID: <9cqdb0Fpn4U1@mid.individual.net>

"Piet van Oostrum" <piet at vanoostrum.org> wrote in message 
news:m2zkigartn.fsf at cochabamba.vanoostrum.org...
> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>
>
>> INFO:DAVServer.fshandler:get_data: d:\webdav not found
>> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1>
>> Gecko/
>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1>
>> Gecko/
>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>
> From the log it looks like you are trying to access the server with the
> url:
>
> http://localhost:8008/ or something similar.

Yes, I do.

> This won't work as you would try to access the root of your webdav
> directory in this way (i.e. D:/webdav). The webdav server can only serve
> files, not directories, so you would have to access
> http://localhost:8008/somefile.txt where somefile.txt is a file in
> D:/webdav.

OK, thanks. I am not familiar to WebDAV.
I tried. Got something different (at least something happened):
"Setuptools version 0.6c9 or greater has been installed.
(Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"

Wasn't able to find ez_setup.py yet.

> This only applies to acces using a browser. If you access the server
> through a webdav-aware client (for example the Finder on Mac OS X, or
> probably the Windows Explorer) it can serve the contents of the directory.
> -- 

Thanks. I am just trying to use a calendar with a webdav server. I don't 
have any experience with that.
Simply using my browser to try it out.

Fokke 




From gherron at digipen.edu  Wed Sep  7 19:31:37 2011
From: gherron at digipen.edu (Gary Herron)
Date: Wed, 07 Sep 2011 16:31:37 -0700
Subject: I am confused by
In-Reply-To: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
References: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
Message-ID: <4E67FED9.7050609@digipen.edu>

On 09/07/2011 03:57 PM, Martin Rixham wrote:
> Hi all
> I would appreciate some help understanding something. Basically I am 
> confused by the following:
>
> >>> a = [[0, 0], [0, 0]]
> >>> b = list(a)
> >>> b[0][0] = 1
> >>> a
> [[1, 0], [0, 0]]
>
> I expected the last line to be
>
> [[0, 0], [0, 0]]
>
> I hope that's clear enough.
>
> Martin

You were expecting the assignment to "b" to create a copy of the 
original list, and it does, but the copy is only one level deep.

So a and b are different lists, but a[i] and b[i] are the same objects 
for each i.

There is a "deepcopy" in the library which may do what you expect.

Gary Herron


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From python at mrabarnett.plus.com  Wed Sep  7 19:39:02 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 00:39:02 +0100
Subject: I am confused by
In-Reply-To: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
References: <CAO_vtCZt1CTZnN9ss-X3RM5a=09PhkS0sHo00H4g3soeAQkKFw@mail.gmail.com>
Message-ID: <4E680096.1020001@mrabarnett.plus.com>

On 07/09/2011 23:57, Martin Rixham wrote:
> Hi all
> I would appreciate some help understanding something. Basically I am
> confused by the following:
>
>  >>> a = [[0, 0], [0, 0]]
>  >>> b = list(a)
>  >>> b[0][0] = 1
>  >>> a
> [[1, 0], [0, 0]]
>
> I expected the last line to be
>
> [[0, 0], [0, 0]]
>
> I hope that's clear enough.
>
What you were expecting is called a "deep copy".

You should remember that a list doesn't contain objects themselves, but
only _references_ to objects.

"list" will copy the list itself (a "shallow copy"), including the
references which are in it, but it won't copy the _actual_ objects to
which they refer.

Try using the "deepcopy" function from the "copy" module:

 >>> from copy import deepcopy
 >>> a = [[0, 0], [0, 0]]
 >>> b = deepcopy(a)
 >>> b[0][0] = 1
 >>> a
[[0, 0], [0, 0]]


From python.list at tim.thechases.com  Wed Sep  7 20:01:33 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 07 Sep 2011 19:01:33 -0500
Subject: Best way to check that you are at the beginning (the end) of
	an iterable?
In-Reply-To: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>	<mailman.849.1315435715.27778.python-list@python.org>
	<d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
Message-ID: <4E6805DD.60607@tim.thechases.com>

On 09/07/11 18:22, Laurent wrote:
> Anyway I was just asking if there is something better than
> enumerate. So the answer is no? The fact that I have to create
> a tuple with an incrementing integer for something as simple
> as checking that I'm at the head just sounds awfully
> unpythonic to me.

I've made various generators that are roughly (modulo 
edge-condition & error checking) something like

  def with_prev(it):
    prev = None
    for i in it:
      yield prev, i
      i = prev

  def with_next(it):
    prev = it.next()
    for i in it:
      yield prev, i
      prev = i
    yield prev, None

which can then be used something like your original

   for cur, next in with_next(iterable):
     if next is None:
       do_something_with_last(cur)
     else:
       do_regular_stuff_with_non_last(cur)

   for prev, cur in with_prev(iterable):
     if prev is None:
       do_something_with_first(cur)
     else:
       do_something_with_others(cur)

If your iterable can return None, you could create a custom 
object to signal the non-condition:

   NO_ITEM = object()

and then use NO_ITEM in place of "None" in the above code.

-tkc




From cs at zip.com.au  Wed Sep  7 20:23:14 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Thu, 8 Sep 2011 10:23:14 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
Message-ID: <20110908002314.GA15766@cskk.homeip.net>

On 07Sep2011 16:22, Laurent <laurent.payot at gmail.com> wrote:
| I totally understand the performance issue that an hypothetical
| "istail" would bring, even if I think it would just be the programmer's
| responsibility not to use it when it's not certain that an end can
| be detected.

The trouble with these things is that their presence leads to stallable
code, often in libraries. Let the programmer write code dependent on
istail() without thinking of the stall case (or even the gratuitous
execution case, as in a generator with side effects in calling .next())
and have that buried in a utilities function.

Facilities like feof() in C and eof in Pascal already lead to lots of
code that runs happily with flat files and behaves badly in interactive
or piped input. It is _so_ easy to adopt a style like:

  while not eof(filehandle):
    line = filehandle.nextline()
    ...

that is it often thought that having offered the eof() function is a
design error. (Of course in the example above the usual python idiom
would win out from existing habit, but there are plenty of other
situations where is would just be _easy_ to rely of istail() in whatever
form.)

| But I don't see why *adding* something like "ishead" would be so bad
| (at worse by using a boolean somewhere as you mentioned).

It is not awful, but as remarked:
  - extra storage cost to _every_ iterable, for a rarely used facility
  - extra runtime cost to maintain the state
  - _retroactive_ burden on _every_ iterator implementation presently
    existing; every iterator sudden needs to implement and offer this
    extra facility to be generate purpose use
  - it is easy to provide the facility on the rare occasions when it is
    needed

Personally, I think point 3 above is the killer and 1 and 2 are serious
counter arguments.

| Anyway I was just asking if there is something better than enumerate. So
| the answer is no? The fact that I have to create a tuple with an
| incrementing integer for something as simple as checking that I'm at
| the head just sounds awfully unpythonic to me.

You can just use a boolean if you like. I have plent of loops like:

  first = true
  for i in iterable:
    if first:
      blah ...
    ...
    first = False

Cheap and easy. Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Bye and bye, God caught his eye, - Epitaph for a waiter by David McCord


From miki.tebeka at gmail.com  Wed Sep  7 20:24:53 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Wed, 7 Sep 2011 17:24:53 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
Message-ID: <7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>

I guess enumerate is the best way to check for first argument. Note that if someone passes you the iterator as argument you have now way of checking if the consumed items from it.

istail can be implemented using itertools.chain, see https://gist.github.com/1202260


From steve+comp.lang.python at pearwood.info  Wed Sep  7 20:24:58 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 08 Sep 2011 10:24:58 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
Message-ID: <4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>

Laurent wrote:

> Hi there,
> 
> What is the simplest way to check that you are at the beginning or at the
> end of an iterable?


I don't think this question is meaningful. There are basically two
fundamental types of iterables, sequences and iterators.

Sequences have random access and a length, so if the "start" and "end" of
the sequence is important to you, just use indexing:

beginning = sequence[0]
end = sequence[-1]
for i, x in enumerate(sequence):
    if i == 0: print("at the beginning")
    elif i == len(sequence)-1: print("at the end")
    print(x)


Iterators don't have random access, and in general they don't have a
beginning or an end. There may not be any internal sequence to speak of:
the iterator might be getting data from a hardware device that provides
values continuously, or some other series of values without a well-defined
beginning or end. Example:

def time():
    from time import asctime
    while True:
        yield asctime()

it = time()

What would it even mean to say that I am at the beginning or end of it?

Iterators have no memory, so in one sense you are *always* at the beginning
of the iterator: next() always returns the next item, and the previous item
is lost forever. So the answer to the question "Am I at the beginning of an
iterator?" is always "You are now".

For sequences, the question is best handled differently. For iterators, the
question doesn't make sense in general. If you need an iterator that can
report its internal state, write your own:

import random, time
class MyIter(object):
    def __init__(self):
        self.start = True
        self.end = False
    def __next__(self):
        if self.start:
            self.start = False
        if self.end:
            raise StopIteration
        if random.random() < 0.01:
            self.end = True
        return time.asctime()
    def __iter__(self):
        return self



-- 
Steven



From steve+comp.lang.python at pearwood.info  Wed Sep  7 20:29:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 08 Sep 2011 10:29:26 +1000
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
Message-ID: <4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>

Peter Otten wrote:

> Classes and functions are grouped into
> submodules by their functionality rather than employing Java's mechanical
> one-class-per-file pattern.

Surely it's an anti-pattern?

I suppose "one class per file" might be useful for those using an editor
with no search functionality. Other than that, is there any justification
for this rule? Any Java fans want to defend this?

If "one class per file", why not "one method per class" too? Why is the
second rule any more silly than the first?



-- 
Steven



From cdchong at stanford.edu  Wed Sep  7 20:37:51 2011
From: cdchong at stanford.edu (Christophe Chong)
Date: Wed, 7 Sep 2011 17:37:51 -0700
Subject: Floating point multiplication in python
In-Reply-To: <j44rre$e4c$1@r03.glglgl.eu>
References: <mailman.790.1315289581.27778.python-list@python.org>
	<j44rre$e4c$1@r03.glglgl.eu>
Message-ID: <CAFS6CezHfHvGveDDc+8y03VGQxDo0W7Z7K8RMRaMEyzWrj7txA@mail.gmail.com>

And then we learned in class what happens when you're calculating "0.1" with
different precision in the industry.

http://www.ima.umn.edu/~arnold/disasters/patriot.html

Beware.

On Tue, Sep 6, 2011 at 3:14 AM, Thomas Rachel <
nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de> wrote:

> Am 06.09.2011 07:57 schrieb xyz:
>
>> hi all:
>>
>> As we know ,  1.1 * 1.1 is 1.21 .
>> But in python ,I got following :
>>
>>  1.1 * 1.1
>>>>>
>>>> 1.2100000000000002
>>
>> why python get wrong result? Who can tell me  where's the
>> 0.0000000000000002 from?
>>
>
> 1.1 does not fit in a binary floating point number. It is approximated - in
> binary! - as 1.000110011001100110011 ... (periodically).
>
> Note that, while in the decimal system we normally use, only numbers which
> have other components in the denominator than 2 or 5 are periodically, in
> the binary systems only components with 2 are allowed in order not to be
> periodically.
>
> Example: 3.453 is not periodically, because it is 3453/100 and 100 has only
> the factors 2 and 5, each twice.
>
> 1/3 = .3333333... is periodically, because it has the factor 3. The same
> applies to 1/6, which has 2 and 3 as factors. The latter destroys the
> non-periodical behaviour.
>
> As said, in the dual system, only the 2 is allowed.
>
> .5 (10) = 2** -1 = .1 (2).
> .25 (10) = 2 ** -2 = .01 (2).
> .75 (10) = their sum = .11 (2).
>
> But .1 (1/10) is more complicated, -2 would be as well.
>
> As the IEEE floating point representation is limited, there is a slight
> error value which makes the stored value differ from the intended one.
>
> Look here:
>
>
>
>  x=(1,0,0,0,1,1,0,0,1,1,0,0,1,**1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,**
>>>> 1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,**0,1,1,0,0,1,1,0,0,1,1,0,0,1,1)
>>>> a=0
>>>> for n,i in enumerate(x): a += i*2**-n; print a, a-1.1, i*2**-n, a-olda
>>>>
>>> ...
> 1 -0.1 1 1
> 1.0 -0.1 0.0 0.0
> 1.0 -0.1 0.0 0.0
> 1.0 -0.1 0.0 0.0
> 1.0625 -0.0375 0.0625 0.0625
> 1.09375 -0.00625 0.03125 0.03125
> 1.09375 -0.00625 0.0 0.0
> 1.09375 -0.00625 0.0 0.0
> 1.09765625 -0.00234375 0.00390625 0.00390625
> 1.099609375 -0.000390625 0.001953125 0.001953125
> 1.099609375 -0.000390625 0.0 0.0
> 1.099609375 -0.000390625 0.0 0.0
> 1.09985351562 -0.000146484375 0.000244140625 0.000244140625
> 1.09997558594 -2.44140625001e-05 0.0001220703125 0.0001220703125
> 1.09997558594 -2.44140625001e-05 0.0 0.0
> 1.09997558594 -2.44140625001e-05 0.0 0.0
> 1.09999084473 -9.15527343759e-06 1.52587890625e-05 1.52587890625e-05
> 1.09999847412 -1.52587890634e-06 7.62939453125e-06 7.62939453125e-06
> 1.09999847412 -1.52587890634e-06 0.0 0.0
> 1.09999847412 -1.52587890634e-06 0.0 0.0
> 1.0999994278 -5.72204589933e-07 9.53674316406e-07 9.53674316406e-07
> 1.09999990463 -9.53674317294e-08 4.76837158203e-07 4.76837158203e-07
> 1.09999990463 -9.53674317294e-08 0.0 0.0
> 1.09999990463 -9.53674317294e-08 0.0 0.0
> 1.09999996424 -3.57627869541e-08 5.96046447754e-08 5.96046447754e-08
> 1.09999999404 -5.96046456636e-09 2.98023223877e-08 2.98023223877e-08
> 1.09999999404 -5.96046456636e-09 0.0 0.0
> 1.09999999404 -5.96046456636e-09 0.0 0.0
> 1.09999999776 -2.23517426789e-09 3.72529029846e-09 3.72529029846e-09
> 1.09999999963 -3.72529118664e-10 1.86264514923e-09 1.86264514923e-09
> 1.09999999963 -3.72529118664e-10 0.0 0.0
> 1.09999999963 -3.72529118664e-10 0.0 0.0
> 1.09999999986 -1.3969847501e-10 2.32830643654e-10 2.32830643654e-10
> 1.09999999998 -2.32831531832e-11 1.16415321827e-10 1.16415321827e-10
> 1.09999999998 -2.32831531832e-11 0.0 0.0
> 1.09999999998 -2.32831531832e-11 0.0 0.0
> 1.09999999999 -8.73123795486e-12 1.45519152284e-11 1.45519152284e-11
> 1.1 -1.45528034068e-12 7.27595761418e-12 7.27595761418e-12
> 1.1 -1.45528034068e-12 0.0 0.0
> 1.1 -1.45528034068e-12 0.0 0.0
> 1.1 -5.45785638906e-13 9.09494701773e-13 9.09494701773e-13
> 1.1 -9.10382880193e-14 4.54747350886e-13 4.54747350886e-13
> 1.1 -9.10382880193e-14 0.0 0.0
> 1.1 -9.10382880193e-14 0.0 0.0
> 1.1 -3.41948691585e-14 5.68434188608e-14 5.68434188608e-14
> 1.1 -5.77315972805e-15 2.84217094304e-14 2.84217094304e-14
> 1.1 -5.77315972805e-15 0.0 0.0
> 1.1 -5.77315972805e-15 0.0 0.0
> 1.1 -2.22044604925e-15 3.5527136788e-15 3.5527136788e-15
> 1.1 -4.4408920985e-16 1.7763568394e-15 1.7763568394e-15
> 1.1 -4.4408920985e-16 0.0 0.0
> 1.1 -4.4408920985e-16 0.0 0.0
> 1.1 -2.22044604925e-16 2.22044604925e-16 2.22044604925e-16
> 1.1 0.0 1.11022302463e-16 2.22044604925e-16
> 1.1 0.0 0.0 0.0
> 1.1 0.0 0.0 0.0
> 1.1 0.0 1.38777878078e-17 0.0
> 1.1 0.0 6.93889390391e-18 0.0
>
> So here we have reached the point where the maximum precision is reached -
> a doesn't change anymore, although it should. The error is about 1E-16.
>
> Now if you multiply two values with an error, the error also propagates
> into the result - PLUs the result can have its own error source - in the
> same order of magnitude.
>
> (a+e) * (a+e) = a*a + 2*a*e + e*e. So your new error term is 2*a*e + e*e or
> (2*a + e) * e.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>



-- 
Christophe Chong
Department of Economics
Stanford University
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From laurent.payot at gmail.com  Wed Sep  7 20:53:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 17:53:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.854.1315441399.27778.python-list@python.org>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.854.1315441399.27778.python-list@python.org>
Message-ID: <c717ba23-1cdb-447d-9c1a-dd2d306b8bcb@glegroupsg2000goo.googlegroups.com>

Yes of course the use of a boolean variable is obvious but I'm mixing python code with html using Mako templates. In Mako for code readability reasons I try to stick to simple "for" and "if" constructions, and I try to avoid variables declarations inside the html, that's all.  Thanks anyway.


From laurent.payot at gmail.com  Wed Sep  7 20:53:36 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 17:53:36 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.854.1315441399.27778.python-list@python.org>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.854.1315441399.27778.python-list@python.org>
Message-ID: <c717ba23-1cdb-447d-9c1a-dd2d306b8bcb@glegroupsg2000goo.googlegroups.com>

Yes of course the use of a boolean variable is obvious but I'm mixing python code with html using Mako templates. In Mako for code readability reasons I try to stick to simple "for" and "if" constructions, and I try to avoid variables declarations inside the html, that's all.  Thanks anyway.


From laurent.payot at gmail.com  Wed Sep  7 21:05:17 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:05:17 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <ecf00f75-5686-427d-abf7-e97cdaa115d0@glegroupsg2000goo.googlegroups.com>


> I don't think this question is meaningful. There are basically two
> fundamental types of iterables, sequences and iterators.
> 
> Sequences have random access and a length, so if the "start" and "end" of
> the sequence is important to you, just use indexing:
> 
> beginning = sequence[0]
> end = sequence[-1]
> for i, x in enumerate(sequence):
>     if i == 0: print("at the beginning")
>     elif i == len(sequence)-1: print("at the end")
>     print(x)
> 
> 
> Iterators don't have random access, and in general they don't have a
> beginning or an end. There may not be any internal sequence to speak of:
> the iterator might be getting data from a hardware device that provides
> values continuously, or some other series of values without a well-defined
> beginning or end. 

Maybe I should have said "best way to check that you didn't start the iteration process yet" but you see what I mean.

Well I guess I have to unlearn my bad lisp/scheme habits...



From laurent.payot at gmail.com  Wed Sep  7 21:06:53 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:06:53 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
Message-ID: <ff37a8cf-2fdf-4e87-bbb1-ce70dd419ac3@glegroupsg2000goo.googlegroups.com>

Yes, I was just hoping for something already included that I wouldn't know (i'm new to Python).


From tjreedy at udel.edu  Wed Sep  7 21:06:56 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 07 Sep 2011 21:06:56 -0400
Subject: Best way to check that you are at the beginning (the end) of
	an iterable?
In-Reply-To: <20110908002314.GA15766@cskk.homeip.net>
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<20110908002314.GA15766@cskk.homeip.net>
Message-ID: <j494h6$ppq$1@dough.gmane.org>

On 9/7/2011 8:23 PM, Cameron Simpson wrote:
> On 07Sep2011 16:22, Laurent<laurent.payot at gmail.com>  wrote:
> | I totally understand the performance issue that an hypothetical
> | "istail" would bring, even if I think it would just be the programmer's
> | responsibility not to use it when it's not certain that an end can
> | be detected.
>
> The trouble with these things is that their presence leads to stallable
> code, often in libraries. Let the programmer write code dependent on
> istail() without thinking of the stall case (or even the gratuitous
> execution case, as in a generator with side effects in calling .next())
> and have that buried in a utilities function.
>
> Facilities like feof() in C and eof in Pascal already lead to lots of
> code that runs happily with flat files and behaves badly in interactive
> or piped input. It is _so_ easy to adopt a style like:
>
>    while not eof(filehandle):
>      line = filehandle.nextline()
>      ...
>
> that is it often thought that having offered the eof() function is a
> design error. (Of course in the example above the usual python idiom
> would win out from existing habit, but there are plenty of other
> situations where is would just be _easy_ to rely of istail() in whatever
> form.)
>
> | But I don't see why *adding* something like "ishead" would be so bad
> | (at worse by using a boolean somewhere as you mentioned).
>
> It is not awful, but as remarked:
>    - extra storage cost to _every_ iterable, for a rarely used facility
>    - extra runtime cost to maintain the state
>    - _retroactive_ burden on _every_ iterator implementation presently
>      existing; every iterator sudden needs to implement and offer this
>      extra facility to be generate purpose use
>    - it is easy to provide the facility on the rare occasions when it is
>      needed
>
> Personally, I think point 3 above is the killer and 1 and 2 are serious
> counter arguments.

The iterator protocol is intentionally as simple as sensibly possible.

> | Anyway I was just asking if there is something better than enumerate. So
> | the answer is no? The fact that I have to create a tuple with an
> | incrementing integer for something as simple as checking that I'm at
> | the head just sounds awfully unpythonic to me.
>
> You can just use a boolean if you like. I have plent of loops like:
>
>    first = true
>    for i in iterable:
>      if first:
>        blah ...
>      ...
>      first = False
>
> Cheap and easy. Cheers,

Or grab and process the first item separately from the rest.

it = iter(iterable)
try:
   first = next(it)
   <process first item>
except StopIteration:
   raise ValueError("Empty iterable not allowed")
for i in it:
   <process non-first item>

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Wed Sep  7 21:08:11 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 07 Sep 2011 21:08:11 -0400
Subject: Best way to check that you are at the beginning (the end) of
	an iterable?
In-Reply-To: <4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<4e680b5b$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j494jh$ppq$2@dough.gmane.org>

On 9/7/2011 8:24 PM, Steven D'Aprano wrote:

> I don't think this question is meaningful. There are basically two
> fundamental types of iterables, sequences and iterators.

And non-sequence iterables like set and dict.

> Sequences have random access and a length, so if the "start" and "end" of
> the sequence is important to you, just use indexing:
>
> beginning = sequence[0]
> end = sequence[-1]
> for i, x in enumerate(sequence):
>      if i == 0: print("at the beginning")
>      elif i == len(sequence)-1: print("at the end")
>      print(x)

And finite non-sequences can be turned into sequences with list(iterable).

-- 
Terry Jan Reedy



From laurent.payot at gmail.com  Wed Sep  7 21:08:51 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:08:51 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.857.1315443772.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
	<d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.857.1315443772.27778.python-list@python.org>
Message-ID: <e0009de6-de88-407e-be89-2b82d229fb7f@glegroupsg2000goo.googlegroups.com>

Interesting. I will check that yield functionality out. Thanks.


From laurent.payot at gmail.com  Wed Sep  7 21:08:51 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:08:51 -0700 (PDT)
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <mailman.857.1315443772.27778.python-list@python.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
	<d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.857.1315443772.27778.python-list@python.org>
Message-ID: <e0009de6-de88-407e-be89-2b82d229fb7f@glegroupsg2000goo.googlegroups.com>

Interesting. I will check that yield functionality out. Thanks.


From jenn.duerr at gmail.com  Wed Sep  7 21:32:21 2011
From: jenn.duerr at gmail.com (noydb)
Date: Wed, 7 Sep 2011 18:32:21 -0700 (PDT)
Subject: how to make fxn argument work with setting a field value
Message-ID: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>

What do I need to do to line 14 code below to get it to recognize the
field name and not the argument name?

I get this error with below code at line 13, the print row.rankFld
line
>RuntimeError: Row: Field rankFld does not exist
A field called rankFld does not, should not exist.  rankFld is
"RANKa" (in this first iteration), which does exist (gets added in
line 6, verified).
Line 14 fails too, if 13 is commented out.


##
import arcpy

fc = r"C:\test\scratch.gdb\sort_test1"

def rank(inFC, outFC, scoreFld, popFld, rankFld):
    arcpy.AddField_management(inFC, rankFld, "LONG")
    arcpy.management.Sort(inFC, outFC, [[scoreFld, "DESCENDING"],
[popFld, "DESCENDING"]])
    i = 0
    print rankFld # >RANKa
    rows = arcpy.UpdateCursor(fc)
    for row in rows:
        i = i + 1
        print row.rankFld
        row.rankFld = i ## line 14
        rows.updateRow(row)

    return sortedFC
#

out1 = r"C:\test\scratch.gdb\rankfxn6"
out2 = r"C:\test\scratch.gdb\rankfxn7"

rank(fc, out1, "SCOREa", "COUNT1", "RANKa")
rank(out1, out2, "SCOREb", "COUNT2", "RANKb")
##


From laurent.payot at gmail.com  Wed Sep  7 21:40:23 2011
From: laurent.payot at gmail.com (Laurent)
Date: Wed, 7 Sep 2011 18:40:23 -0700 (PDT)
Subject: Running Python Demo on the Web?
In-Reply-To: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
Message-ID: <d1496b92-b010-4499-9687-b13b9b6b52ac@glegroupsg2000goo.googlegroups.com>

Neat. But I can see some "print(x)" and some "print x". What is the Python version?


From python at mrabarnett.plus.com  Wed Sep  7 22:11:07 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 03:11:07 +0100
Subject: how to make fxn argument work with setting a field value
In-Reply-To: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
References: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
Message-ID: <4E68243B.7060104@mrabarnett.plus.com>

On 08/09/2011 02:32, noydb wrote:
> What do I need to do to line 14 code below to get it to recognize the
> field name and not the argument name?
>
> I get this error with below code at line 13, the print row.rankFld
> line
>> RuntimeError: Row: Field rankFld does not exist
> A field called rankFld does not, should not exist.  rankFld is
> "RANKa" (in this first iteration), which does exist (gets added in
> line 6, verified).
> Line 14 fails too, if 13 is commented out.
>
>
> ##
> import arcpy
>
> fc = r"C:\test\scratch.gdb\sort_test1"
>
> def rank(inFC, outFC, scoreFld, popFld, rankFld):
>      arcpy.AddField_management(inFC, rankFld, "LONG")
>      arcpy.management.Sort(inFC, outFC, [[scoreFld, "DESCENDING"],
> [popFld, "DESCENDING"]])
>      i = 0
>      print rankFld #>RANKa
>      rows = arcpy.UpdateCursor(fc)
>      for row in rows:
>          i = i + 1
>          print row.rankFld
>          row.rankFld = i ## line 14
>          rows.updateRow(row)
>
>      return sortedFC
> #
>
> out1 = r"C:\test\scratch.gdb\rankfxn6"
> out2 = r"C:\test\scratch.gdb\rankfxn7"
>
> rank(fc, out1, "SCOREa", "COUNT1", "RANKa")
> rank(out1, out2, "SCOREb", "COUNT2", "RANKb")
> ##
The documentation mentions "getValue" and "setValue":

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002z0000001q000000


From clp2 at rebertia.com  Wed Sep  7 22:27:09 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 7 Sep 2011 19:27:09 -0700
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<7d4ab46b-d37e-4851-bea3-11ce040815d5@glegroupsg2000goo.googlegroups.com>
Message-ID: <CAMZYqRTo0hj80xk031b+VboyC2PO-evB1BTP4yvBn76NN5E1JQ@mail.gmail.com>

On Wed, Sep 7, 2011 at 5:24 PM, Miki Tebeka <miki.tebeka at gmail.com> wrote:
> I guess enumerate is the best way to check for first argument. Note that if someone passes you the iterator as argument you have now way of checking if the consumed items from it.
>
> istail can be implemented using itertools.chain, see https://gist.github.com/1202260

For the archives, if Gist ever goes down:

from itertools import chain

def istail(it):
    '''Check if iterator has one more element. Return True/False and
    iterator.'''
    try:
        i = next(it)
    except StopIteration:
        return False, it

    try:
        j = next(it)
        return False, chain([i, j], it)
    except StopIteration:
        return True, chain([i], it)


t, it = istail(iter([]))
print t, list(it)
t, it = istail(iter([1]))
print t, list(it)
t, it = istail(iter([1, 2]))
print t, list(it)


From rosuav at gmail.com  Wed Sep  7 22:39:16 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 8 Sep 2011 12:39:16 +1000
Subject: How to structure packages
In-Reply-To: <4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmqF6+frkE9-TO_Gc6qOcNzWbRXEDWvFqN0Op8diNP12uQ@mail.gmail.com>

On Thu, Sep 8, 2011 at 10:29 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Peter Otten wrote:
>
>> Classes and functions are grouped into
>> submodules by their functionality rather than employing Java's mechanical
>> one-class-per-file pattern.
>
> Surely it's an anti-pattern?

I don't think that's true; Java merely enforces one _public_ class per
source file. A file can have non-public classes, although one .class
file has only one class in it (so javac will sometimes make multiple
object files from one source file). I'm not wholly sure of the
significance of public classes, though, and whether or not it's
possible to do your logical grouping and just let them be non-public.

BTW, I am not a Java fan, and I don't have any defense prepared. I
haven't actually written any serious Java code for a number of years.
Used to use it back when IBM reckoned that Java would be the big thing
that sells OS/2.

ChrisA


From sahil at FreeBSD.org  Thu Sep  8 00:00:20 2011
From: sahil at FreeBSD.org (Sahil Tandon)
Date: Thu, 8 Sep 2011 00:00:20 -0400
Subject: Running Python Demo on the Web?
In-Reply-To: <d1496b92-b010-4499-9687-b13b9b6b52ac@glegroupsg2000goo.googlegroups.com>
References: <fcb7038a-0e44-45fb-b7e4-1153e6137337@l12g2000yqe.googlegroups.com>
	<d1496b92-b010-4499-9687-b13b9b6b52ac@glegroupsg2000goo.googlegroups.com>
Message-ID: <20110908040019.GH3046@magic.hamla.org>

On Wed, 2011-09-07 at 18:40:23 -0700, Laurent wrote:

> Neat. But I can see some "print(x)" and some "print x". What is the
> Python version?

See:

 http://docs.python.org/release/3.2.2/whatsnew/3.0.html#print-is-a-function
 http://www.python.org/dev/peps/pep-3105/

-- 
Sahil Tandon <sahil at FreeBSD.org>


From 1248283536 at qq.com  Thu Sep  8 00:24:15 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 8 Sep 2011 12:24:15 +0800
Subject: my  multi-download program can't finish
Message-ID: <tencent_0BE9496E443609034B36FE07@qq.com>

here is the program,

# basic structure,omit something
import Queue
 import httplib2
 import threading
 jobs = Queue.Queue()
name=something   #omit ,it is a web list to download
 for  x  in  name:
   jobs.put(x)
 
 def download():
     while not jobs.empty():
             try:
                 url = jobs.get()
                 hx = httplib2.Http()
                 resp, content = hx.request(url, headers=headers)
                 jobs.task_done()
             except:
                 print  "wrong" , url          
           
 if __name__ == '__main__':
    
     for i in range(10):
           threading.Thread(target=download).start()   
     jobs.join()

when it run ,it can download someting ,
it is strang:there is wrong output ,some web can't get,but  the program can't stop,it stay ,run ,can't fininsh,
i don't know why?
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From 1248283536 at qq.com  Thu Sep  8 00:50:52 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 8 Sep 2011 12:50:52 +0800
Subject: multi-down in threading module
Message-ID: <tencent_3D0134CB52460D7C4E91609E@qq.com>

i want to download data in  multiprocess ,i know the threading structure,but i can't finish it,
would you mind to revise it ?
any advice appreciated.
[code]
import urllib
import threading
URL = "http://download.finance.yahoo.com/d/quotes.csv?s=%s&f=sl1t1v&e=.csv"
symbols = ('GGP', 'JPM', 'AIG', 'AMZN','GGP', 'JPM', 'AIG', 'AMZN')
url =[ URL % '+'.join(sym)  for sym in symbols]

num=rang(3)  

def  down(url):
    print urllib.urlopen(url).read()
  
  
for i in num:   #these code  i can't finish 
    t=threading.Thread(target=down,args=  )
    threads.append(t)
  
  
for i in nmu:
    threads[i].start()
  

for i in num:
     threads[i].join()

[/code]
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From steve+comp.lang.python at pearwood.info  Thu Sep  8 01:08:38 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 08 Sep 2011 15:08:38 +1000
Subject: my  multi-download program can't finish
References: <mailman.865.1315455870.27778.python-list@python.org>
Message-ID: <4e684dd8$0$29970$c3e8da3$5496439d@news.astraweb.com>

On Thu, 8 Sep 2011 02:24 pm ???? wrote:

[...]
>              try:
>                  url = jobs.get()
>                  hx = httplib2.Http()
>                  resp, content = hx.request(url, headers=headers)
>                  jobs.task_done()
>              except:
>                  print  "wrong" , url

> when it run ,it can download someting ,
> it is strang:there is wrong output ,some web can't get,but  the program
> can't stop,it stay ,run ,can't fininsh, i don't know why?

If you read the helpful error messages that Python provides, instead of
hiding them and printing a useless message "wrong", you might find out why
the failures are happening.

Get rid of the try...except and see what exceptions you get. Then you will
be in a better situation to decide which exceptions should be caught, and
which are bugs that need to be fixed, and which should be allowed through.



-- 
Steven



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Date: Wed, 7 Sep 2011 23:46:13 -0700 (PDT)
Subject: FOR EXCLUSIVE HOT ASIN PICS
Message-ID: <1bceb162-850e-4ab8-bfe1-dc7658b8c7bc@r40g2000prf.googlegroups.com>


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Message-ID: <0f6e0dd9-b138-4279-90db-f640daf66913@e34g2000prn.googlegroups.com>

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From 1248283536 at qq.com  Thu Sep  8 03:46:55 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 8 Sep 2011 15:46:55 +0800
Subject: =?gbk?B?u9i4tKO6IG15ICBtdWx0aS1kb3dubG9hZCBwcm9n?=
	=?gbk?B?cmFtIGNhbid0IGZpbmlzaA==?=
Message-ID: <tencent_77B2FC0E3EB3B6C3184DE940@qq.com>

sometimes,the output is:
error: [Errno 104] Connection reset by peer 
------------------ ???? ------------------
???: "Steven D'Aprano"<steve+comp.lang.python at pearwood.info>;
????: 2011?9?8?(???) ??1:08
???: "python-list"<python-list at python.org>; 

??: Re: my  multi-download program can't finish

 
On Thu, 8 Sep 2011 02:24 pm ???? wrote:

[...]
>              try:
>                  url = jobs.get()
>                  hx = httplib2.Http()
>                  resp, content = hx.request(url, headers=headers)
>                  jobs.task_done()
>              except:
>                  print  "wrong" , url

> when it run ,it can download someting ,
> it is strang:there is wrong output ,some web can't get,but  the program
> can't stop,it stay ,run ,can't fininsh, i don't know why?

If you read the helpful error messages that Python provides, instead of
hiding them and printing a useless message "wrong", you might find out why
the failures are happening.

Get rid of the try...except and see what exceptions you get. Then you will
be in a better situation to decide which exceptions should be caught, and
which are bugs that need to be fixed, and which should be allowed through.



-- 
Steven

-- 
http://mail.python.org/mailman/listinfo/python-list
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From jenn.duerr at gmail.com  Thu Sep  8 03:59:41 2011
From: jenn.duerr at gmail.com (noydb)
Date: Thu, 8 Sep 2011 00:59:41 -0700 (PDT)
Subject: how to make fxn argument work with setting a field value
References: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
	<mailman.861.1315447873.27778.python-list@python.org>
Message-ID: <c95f57a0-1c55-45ea-9123-cb252e8657ae@i21g2000yqd.googlegroups.com>

> The documentation mentions "getValue" and "setValue":
>
> http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002z00...- Hide quoted text -
>
> - Show quoted text -

I have tried row.setValue(rankFld) = i for line 14.  Get syntax error
- cant assign to function call


From gandalf at shopzeus.com  Thu Sep  8 04:41:22 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 08 Sep 2011 10:41:22 +0200
Subject: Portable locale usage
In-Reply-To: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
References: <1040759144.28661.1315420437334.JavaMail.root@mail.zemris.fer.hr>
Message-ID: <4E687FB2.9020908@shopzeus.com>


> I have set the system-wide locale to Croatian (Croatia)
> on my development system as instructed by:
> http://windows.microsoft.com/en-US/windows-vista/Change-the-system-locale
>
> Nevertheless, your proposal produces:
> ('English_United States','1252')
This is what I see on my Hungarian Windows:


C:\Users\User>python
Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit 
(AMD64)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import locale
 >>> locale.setlocale(locale.LC_ALL, '')
'Hungarian_Hungary.1250'
 >>> locale.getlocale()
('Hungarian_Hungary', '1250')
 >>>

So I'm 100% sure that the problem is with your system locale settings, 
not Python.

> Note that I would very much like
> to avoid changing the system locale
> (this requires Administrator password and system restart).
All right. But you understand, that Croatian ISO8859-2 is not supported 
on windows? So you will not be able to sort names with that under a 
windows system? (And it is not a limitation of Python.)
>> Why are you trying to force a specific locale to your program anyway?
> Because I wish to be able to correctly sort Croatian names.
Well, all right. If you want to sort Croatian names from a program that 
runs on an English (or whatever) system, then you will have to check the 
platform and use a locale that is supported by the platform. (But again, 
this is not Python's limitation. Python doesn't know what encodings are 
supported, in advance, and you cannot use a locale that is not supported...)
> I expect that most of my Windows users will not care
> to configure their computers with the national locale
> (and besides, that does not seem to work, anyway).
Croatian users will most likely use a Croatian Windows, out of the box. 
And on those systems, using locale.setlocale(locale.LC_ALL, '') will 
work perfectly. I'm not sure why it doesn't work on an English Windows 
with locale changed... I'm not a big fan of Windows, but I remember once 
I had to install a language pack for Windows before I could use a 
localized program. This might be what you need?

Best,

    Laszlo



From dan at tombstonezero.net  Thu Sep  8 05:51:58 2011
From: dan at tombstonezero.net (Dan Sommers)
Date: Thu, 8 Sep 2011 09:51:58 +0000 (UTC)
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.08.09.51.58@tombstonezero.net>

On Thu, 08 Sep 2011 10:29:26 +1000, Steven D'Aprano wrote:

> I suppose "one class per file" might be useful for those using an editor
> with no search functionality. Other than that, is there any
> justification for this rule? Any Java fans want to defend this?

Back in the dark ages known as the 1980s, we had a one-C-function-per-
file rule on a project with tens of thousands of C functions.  The big 
benefit was that we always knew which source file contained which 
function.  Computers could search a directory tree much more quickly than 
that much source code.  (The exception was the so-called Information 
Cluster, a collection of functions surrounding a data store, the 
predecessor to the modern day object-with-state and/or closure).

Not a Java fan'ly yours,
Dan



From egbertum at xs4all.nl  Thu Sep  8 05:55:02 2011
From: egbertum at xs4all.nl (egbert)
Date: Thu, 8 Sep 2011 11:55:02 +0200
Subject: DRY and class variables
Message-ID: <20110908095502.GA3637@xs4all.nl>

My classes correspond to sql tables.
In these classes I want to have several class variables
that refer to data that are common to all instances.

The assignment statements for the class variables are the same
in all classes, except that of these instructions needs the name
of the class itself. That name is used to read a file with meta-data.

So what I have now is something like this (simplified):

class TableOne(object):
    m = Metadata('TableOne')
    m.do_something()
    def __init__(self):
        etc

class TableTwo(object):
    m = Metadata('TableTwo')
    m.do_something()
    def __init__(self):
        etc

I have tried:
- to eliminate the class name argument, but in this phase of the
  object creation __class__ and __name__ are not available
- to move the two statements to a superclass, but the class variables
  come in the superclass namespace, not in the subclass namespace.

Any ideas ?
e
-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From tartley at tartley.com  Thu Sep  8 06:22:05 2011
From: tartley at tartley.com (Jonathan Hartley)
Date: Thu, 8 Sep 2011 03:22:05 -0700 (PDT)
Subject: How to structure packages
In-Reply-To: <4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <f25f8cd3-d70a-474d-b569-a99222c8f5f0@glegroupsg2000goo.googlegroups.com>

On Thursday, September 8, 2011 1:29:26 AM UTC+1, Steven D&#39;Aprano wrote:
> Steven D'Aprano wrote:
> 
> Other than that, is there any justification
> for this rule? Any Java fans want to defend this?
>
> If "one class per file", why not "one method per class" too? Why is the
> second rule any more silly than the first?


Hey. I'm not a Java fan but I'll give it a go.

One method per class is not a good idea because a class is a bunch of code that forms a coherent conceptual bundle of functionality. Often, to provide such a bundle, it requires more than one method. To split these methods across several classes would be splitting up a single coherent entity, which makes it harder to understand the purpose and identity of the entity, and more fiddly to delineate the boundary between one such entity and the next.

On the other hand, IMHO one class per file is often a good idea. Since a class is a single coherent bundle, then the natural way to split a program into files is often to divide it into these same coherent bundles. Sometimes you have two or more classes that are conceptually very tightly coupled, and it makes sense to gather them up into a single file. However, for me, this is the exception rather than the rule, so in the general case, I usually end up with code that has one class per file. It's only a rule-of-thumb though, and should be broken whenever it seems appropriate.


From t at jollybox.de  Thu Sep  8 06:22:33 2011
From: t at jollybox.de (Thomas Jollans)
Date: Thu, 08 Sep 2011 12:22:33 +0200
Subject: DRY and class variables
In-Reply-To: <20110908095502.GA3637@xs4all.nl>
References: <20110908095502.GA3637@xs4all.nl>
Message-ID: <4E689769.3050701@jollybox.de>

On 08/09/11 11:55, egbert wrote:
> My classes correspond to sql tables.
> In these classes I want to have several class variables
> that refer to data that are common to all instances.
> 
> The assignment statements for the class variables are the same
> in all classes, except that of these instructions needs the name
> of the class itself. That name is used to read a file with meta-data.
> 
> So what I have now is something like this (simplified):
> 
> class TableOne(object):
>     m = Metadata('TableOne')
>     m.do_something()
>     def __init__(self):
>         etc
> 
> class TableTwo(object):
>     m = Metadata('TableTwo')
>     m.do_something()
>     def __init__(self):
>         etc
> 
> I have tried:
> - to eliminate the class name argument, but in this phase of the
>   object creation __class__ and __name__ are not available
> - to move the two statements to a superclass, but the class variables
>   come in the superclass namespace, not in the subclass namespace.
> 
> Any ideas ?

You should be able to do this with a metaclass (almost certainly
overkill), or with a class decorator (Python 2.6+):

def with_metadata (cls):
    cls.m = Metadata (cls.__name__)
    cls.m.do_something ()
    return cls

@with_metadata
class TableOne:
   # foo
   pass



From adam.jorgensen.za at gmail.com  Thu Sep  8 06:30:21 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Thu, 8 Sep 2011 12:30:21 +0200
Subject: [Python-ideas] relaxing keyword usage restrictions
In-Reply-To: <j48nkf$7eq$1@dough.gmane.org>
References: <CANWsHyfzh0Ng_YnJWdH5W3PA6AmnWa7MNGJrPSyk6O=t_bhyPg@mail.gmail.com>
	<e0f505b7-af03-4e43-8303-ec14802f7958@email.android.com>
	<CADiSq7djjn1vPWXjmAffRyi6gGxq=iNUf10RtLZY0PgRwEptwA@mail.gmail.com>
	<20110906164103.772ed18b@resist.wooz.org>
	<CADiSq7dmq7F6Gv0pd2444mjfQs1yG6f24LjWW78aWy9iPxdZGQ@mail.gmail.com>
	<20110906183346.2bcdfbf8@resist.wooz.org>
	<CADiSq7eDu2JL=3Gt_VY3aQ9g4+aWH1pCtc_BVun5W3OVcj43BA@mail.gmail.com>
	<20110906215717.62adf161@resist.wooz.org>
	<CADiSq7dU3m0QP2Pd+HYt0P936XSbAPfMkY_oLYSXFvYsvuFmmQ@mail.gmail.com>
	<j48nkf$7eq$1@dough.gmane.org>
Message-ID: <CAMX1RonN09xm+XAOo+HH5YGkoc-8N4sQrkvjUMux7y7Xbc0LQA@mail.gmail.com>

About the only keyword I can think of this being even slightly useful for
would be class and even then I think that clazz is a pretty acceptable
substitute.
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From piet at vanoostrum.org  Thu Sep  8 06:53:45 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 12:53:45 +0200
Subject: Need help with simple OOP Python question
References: <dce02da0-c9c9-4331-aa2e-7d99f5e26cd1@g9g2000yqb.googlegroups.com>
	<87sjobo3es.fsf@benfinney.id.au>
	<93d65d9e-8a15-4423-94c0-3d385def24ed@et6g2000vbb.googlegroups.com>
	<mailman.779.1315244354.27778.python-list@python.org>
Message-ID: <m2r53rb8zq.fsf@cochabamba.vanoostrum.org>

Terry Reedy <tjreedy at udel.edu> writes:

> Indexing objects by their internal id is usually useless. 

obj.id is not the internal id. 
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From piet at vanoostrum.org  Thu Sep  8 07:01:10 2011
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Thu, 08 Sep 2011 13:01:10 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org>
	<9cbvupFjr3U3@mid.individual.net>
	<86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com>
	<9ccoqkF5efU1@mid.individual.net>
	<a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com>
	<9ck5upFlpnU1@mid.individual.net>
	<f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com>
	<9cmq1vFk6fU1@mid.individual.net>
	<mailman.809.1315328739.27778.python-list@python.org>
	<9cnaekF5nfU1@mid.individual.net>
	<mailman.823.1315377607.27778.python-list@python.org>
	<9cor4gFk15U1@mid.individual.net>
	<d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com>
	<9cpbddFtidU1@mid.individual.net>
	<m2zkigartn.fsf@cochabamba.vanoostrum.org>
	<9cqdb0Fpn4U1@mid.individual.net>
Message-ID: <m2mxefb8nd.fsf@cochabamba.vanoostrum.org>

"Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:

> "Piet van Oostrum" <piet at vanoostrum.org> wrote in message 
> news:m2zkigartn.fsf at cochabamba.vanoostrum.org...
>> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>>
>>
>>> INFO:DAVServer.fshandler:get_data: d:\webdav not found
>>> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1>
>>> Gecko/
>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1>
>>> Gecko/
>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>>
>> From the log it looks like you are trying to access the server with the
>> url:
>>
>> http://localhost:8008/ or something similar.
>
> Yes, I do.
>
>> This won't work as you would try to access the root of your webdav
>> directory in this way (i.e. D:/webdav). The webdav server can only serve
>> files, not directories, so you would have to access
>> http://localhost:8008/somefile.txt where somefile.txt is a file in
>> D:/webdav.
>
> OK, thanks. I am not familiar to WebDAV.
> I tried. Got something different (at least something happened):
> "Setuptools version 0.6c9 or greater has been installed.
> (Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"
>
> Wasn't able to find ez_setup.py yet.
>
Google for it and install.

But I don't understand. You already had WebDav installed, so why do you
need ez_setup.py?

>> This only applies to acces using a browser. If you access the server
>> through a webdav-aware client (for example the Finder on Mac OS X, or
>> probably the Windows Explorer) it can serve the contents of the directory.
>> -- 
>
> Thanks. I am just trying to use a calendar with a webdav server. I don't 
> have any experience with that.
> Simply using my browser to try it out.

Did you try the calendar with the WebDav server running?
Dit you put a file in D:\webdav and try to get it with the browser?

-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]


From rosuav at gmail.com  Thu Sep  8 08:12:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 8 Sep 2011 22:12:59 +1000
Subject: lfun and such
In-Reply-To: <4E68B08D.2090800@dirix.nu>
References: <4E68AC0D.6010007@dirix.nu>
	<4E68B08D.2090800@dirix.nu>
Message-ID: <CAPTjJmowps81-7fEVBOqHy8N8RB+CCSfdA+2b6sV_yHWbYtpJg@mail.gmail.com>

On Thu, Sep 8, 2011 at 10:09 PM, Marc Dirix <marc at dirix.nu> wrote:
> scratch that.
>
> Silly me.
>

Heh. I'm curious now as to what was wrong, but am glad it's all
working! I just switched back from my test run where I made a minimal
class implementing `[]() and `[]=() to see if there was something
weirdly wrong.

ChrisA


From simoncropper at fossworkflowguides.com  Thu Sep  8 08:26:31 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Thu, 08 Sep 2011 22:26:31 +1000
Subject: Create an index from a webpage
Message-ID: <4E68B477.9020703@fossworkflowguides.com>

Hi,

I am getting dizzy on google.

I am after a way of pointing a python routine to my website and have it 
create a tree, represented as a hierarchical HTML list in a webpage, of 
all the pages in that website (recursive list of internal links to HTML 
documents; ignore images, etc.).

It is essentially a contents page or sitemap for the site.

Interestingly, despite trying quite a few keyword combinations, I was 
unable to find such a script.

Anyone have any ideas?

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From PointedEars at web.de  Thu Sep  8 08:38:53 2011
From: PointedEars at web.de (Thomas 'PointedEars' Lahn)
Date: Thu, 08 Sep 2011 14:38:53 +0200
Subject: Create an index from a webpage
References: <mailman.874.1315484806.27778.python-list@python.org>
Message-ID: <1537032.qVoOGUtdWV@PointedEars.de>

Simon Cropper wrote:

> I am after a way of pointing a python routine to my website and have it
> create a tree, represented as a hierarchical HTML list in a webpage, of
> all the pages in that website (recursive list of internal links to HTML
> documents; ignore images, etc.).
> 
> It is essentially a contents page or sitemap for the site.

<http://lmgtfy.com/?q=python+sitemap>

If all else fails, use markup parsers like 

- <http://www.crummy.com/software/BeautifulSoup/>
- <http://lxml.de/>

and write it yourself.  It is not hard to do.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.


From fnautaNO at SPAMiae.nl  Thu Sep  8 09:57:48 2011
From: fnautaNO at SPAMiae.nl (Fokke Nauta)
Date: Thu, 8 Sep 2011 15:57:48 +0200
Subject: Installing WebDAV server
References: <mailman.687.1314941410.27778.python-list@python.org><9cbvupFjr3U3@mid.individual.net><86b084e0-09a8-4997-9e0c-4526d7851e1d@s2g2000vby.googlegroups.com><9ccoqkF5efU1@mid.individual.net><a7cd34d7-ed2b-4449-8edc-a6a45b59ecde@hb5g2000vbb.googlegroups.com><9ck5upFlpnU1@mid.individual.net><f5b9ec16-de9a-4365-81a8-860dc27a985e@d25g2000yqh.googlegroups.com><9cmq1vFk6fU1@mid.individual.net><mailman.809.1315328739.27778.python-list@python.org><9cnaekF5nfU1@mid.individual.net><mailman.823.1315377607.27778.python-list@python.org><9cor4gFk15U1@mid.individual.net><d26f81b2-f87e-46f1-bb4e-8ef1943dfe7f@c29g2000yqd.googlegroups.com><9cpbddFtidU1@mid.individual.net><m2zkigartn.fsf@cochabamba.vanoostrum.org><9cqdb0Fpn4U1@mid.individual.net>
	<m2mxefb8nd.fsf@cochabamba.vanoostrum.org>
Message-ID: <9crvuvFpt2U1@mid.individual.net>

"Piet van Oostrum" <piet at vanoostrum.org> wrote in message 
news:m2mxefb8nd.fsf at cochabamba.vanoostrum.org...
> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>
>> "Piet van Oostrum" <piet at vanoostrum.org> wrote in message
>> news:m2zkigartn.fsf at cochabamba.vanoostrum.org...
>>> "Fokke Nauta" <fnautaNO at SPAMsolfon.nl> writes:
>>>
>>>
>>>> INFO:DAVServer.fshandler:get_data: d:\webdav not found
>>>> XXX --- [07/Sep/2011 11:57:48] - Mozilla/5.0 UJindows NT 5.1; rv:6.0.1>
>>>> Gecko/
>>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>>> XXX --- [07/Sep/2011 11:57:52] - Mozilla/5.0 <Uindows NT 5.1; rv:6.0.1>
>>>> Gecko/
>>>> 20100101 Firefox/6.0.1 - "GET / HTTP/1.1" 404 -
>>>>
>>> From the log it looks like you are trying to access the server with the
>>> url:
>>>
>>> http://localhost:8008/ or something similar.
>>
>> Yes, I do.
>>
>>> This won't work as you would try to access the root of your webdav
>>> directory in this way (i.e. D:/webdav). The webdav server can only serve
>>> files, not directories, so you would have to access
>>> http://localhost:8008/somefile.txt where somefile.txt is a file in
>>> D:/webdav.
>>
>> OK, thanks. I am not familiar to WebDAV.
>> I tried. Got something different (at least something happened):
>> "Setuptools version 0.6c9 or greater has been installed.
>> (Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"
>>
>> Wasn't able to find ez_setup.py yet.
>>
> Google for it and install.

I did.

> But I don't understand. You already had WebDav installed, so why do you
> need ez_setup.py?

Well, that was my mistake. I entered in the browser 
http://10.0.0.140:8081/a.txt (one of the textfiles in the directory 
d:\webdav on the server) and got the message:
"Setuptools version 0.6c9 or greater has been installed.
(Run "ez_setup.py -U setuptools" to reinstall or upgrade.)"

At first I thought this came from the webdav server. That's why I searched 
for the ez_setup.py script. Once it was there, I ran it.
It took me some time before I realized it was the actual content of the 
document a.txt on the webdav server what I saw. So it worked! Different that 
I expected, but it works.

>>> This only applies to acces using a browser. If you access the server
>>> through a webdav-aware client (for example the Finder on Mac OS X, or
>>> probably the Windows Explorer) it can serve the contents of the 
>>> directory.
>>> -- 
>>
>> Thanks. I am just trying to use a calendar with a webdav server. I don't
>> have any experience with that.
>> Simply using my browser to try it out.
>
> Did you try the calendar with the WebDav server running?

Not yet. The next step is the calendar.

> Dit you put a file in D:\webdav and try to get it with the browser?

Yes, and that worked! I am able to see the contents of text files.
In my unfamiliarity with WebDAV I expected to open the directory and see the 
files in there.

Many thanks for your help.

Fokke




From fnautaNO at SPAMiae.nl  Thu Sep  8 10:10:37 2011
From: fnautaNO at SPAMiae.nl (Fokke Nauta)
Date: Thu, 8 Sep 2011 16:10:37 +0200
Subject: Installing WebDAV server
References: <9c4trjFcfmU1@mid.individual.net>
Message-ID: <9cs0mvFoaU1@mid.individual.net>

"Fokke Nauta" <fnautaNO at SPAMsolfon.nl> wrote in message 
news:9c4trjFcfmU1 at mid.individual.net...
> Hi all,
>
> I am completely new to Python, but I'm confronted with a problem I can't 
> solve.
> This is my question:
>
> I'm running a PC with XP Pro32, which acts as a file server/print 
> server/FTP server and web server. The web server is facilitated by the 
> Aprelium Abyss X2 server, and has Perl and PHP support on http and https. 
> It all works fine.
> To do some research with some calender systems and to share the Outlook 
> calendar I need a WebDAV server. After googling I found the Python WebDAV 
> server.
> I installed Python 3.2.1 and extracted the packages PyWebDAV and PyXML. 
> Now I have a working Python app and 2 directories called PyWebDAV-0.9.4.1 
> and PyXML-0.8.4. In the PyWebDAV README it says:
>
> Installation and setup of server can be as easy as follows:
>
> $ easy_install PyWebDAV
> $ davserver -D /tmp -n -J
>
> But of course it doesn't work like that. When I start up Python GUI I see 
> the ">>>" prompt instead of the "$" prompt. But where do I place the two 
> directories? And there is no easy_install script in the PyXML-0.8.4 
> directory, only a setup.py and ez_setup.py script. I guess the latter is 
> the one to use. But how?
>
> How do I proceed next?
>
> Any help will be appreciated.
> Thanks in advance.
>
> With regards,
> Fokke Nauta
>

I have my webdav server up and running.

Many thanks for all who contributed to solving this problem.

With regards,
Fokke Nauta 




From wolftracks at invalid.com  Thu Sep  8 10:10:54 2011
From: wolftracks at invalid.com (W. eWatson)
Date: Thu, 08 Sep 2011 07:10:54 -0700
Subject: [OT] Anyone here familiar with installing Open Watcom F77?
In-Reply-To: <mailman.778.1315240645.27778.python-list@python.org>
References: <j42p3q$poq$1@dont-email.me> <j42sk7$lnj$1@dont-email.me>
	<j42t0r$oht$1@dont-email.me>
	<mailman.778.1315240645.27778.python-list@python.org>
Message-ID: <j4aifj$4c2$1@dont-email.me>

On 9/5/2011 9:36 AM, Colin J. Williams wrote:
> On 05-Sep-11 12:22 PM, Dan Nagle wrote:
>> Hello,
>>
>> On 2011-09-05 16:15:20 +0000, W. eWatson said:
>>
>>> On 9/5/2011 8:24 AM, Chris Angelico wrote:
>>>> On Tue, Sep 6, 2011 at 1:15 AM, W. eWatson<wolftracks at invalid.com>
>>>> wrote:
>>>>> See Subject.
>>
>> <snip>
>>
>>>>> To what extent "familiar"? I have it installed on several computers,
>>>> but only because it comes with Open Wat C/C++.
>>>>
>>>> With something off-topic like this,
>>
>> <snip>
>>
>>>> sierra_mtnview @ sbcglobal.net
>>> Here's the story.
>>>
>>> As far as I can tell F77 1.8 is not available. I've Googled quite a
>>> bit for it. My source for 1.9 is
>>> <http://www.openwatcom.org/index.php/Download>. It gives me:
>>> open-watcom-f77-win32-1.9.exe.
>>
>> On Usenet, comp.lang.fortran might be the best source of help for this.
>> There's a good chance one of the regulars there can answer you
>> within one or two posts. (I'll not cross-post, you can choose for
>> yourself.)
>>
>> HTH
>>
>
> You might get in touch with someone at Waterloo University, which is
> located in Kitchener/Waterloo.
>
> This could have come from the 60's or 70's.
>
> Good luck.
>
> Colin W.
>
Left a message on Tuesday. No return call. I'm starting to make progress 
on this.


From 1248283536 at qq.com  Thu Sep  8 10:12:19 2011
From: 1248283536 at qq.com (=?utf-8?B?YWxpYXM=?=)
Date: Thu, 8 Sep 2011 22:12:19 +0800
Subject: wrap  the queue  to  multiprocess  download
Message-ID: <tencent_4166F0FA34A3622828C18134@qq.com>

here is my part of program,you can see main structure,i want to wrap it in class ,
class   webdata(object):
    def  __init__(self,arg):
        jobs = Queue.Queue()
        for  x  in  name:
            jobs.put(self.url)
                
    
          
    def download(self):
        while not self.jobs.empty():
            url = self.jobs.get()
            hx = httplib2.Http()
            resp, content = hx.request(url, headers=headers).read()
            self.jobs.task_done()


    def  myrun(self):
        for i in range(30):
              threading.Thread(target=self.download).start()
        self.jobs.join()
    
if  __name__=="__main__":

    s=webdata('quote')
    s.myrun()

when it run ,the output is  :
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/pengtao/workspace/try.py", line 75, in download
    resp, content = hx.request(url, headers=headers).read()
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1288, in request
    (scheme, authority, request_uri, defrag_uri) = urlnorm(uri)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 201, in urlnorm
    (scheme, authority, path, query, fragment) = parse_uri(uri)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 197, in parse_uri
    groups = URI.match(uri).groups()
TypeError: expected string or buffer


when i use the same  structrue, don't   wrap it ,it can run .
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From nospam at torek.net  Thu Sep  8 10:21:23 2011
From: nospam at torek.net (Chris Torek)
Date: 8 Sep 2011 14:21:23 GMT
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
References: <d53bfc89-b402-49a6-bd4a-baa28d708f8e@glegroupsg2000goo.googlegroups.com>
	<mailman.854.1315441399.27778.python-list@python.org>
Message-ID: <j4aj1302fg0@news3.newsguy.com>

In article <mailman.854.1315441399.27778.python-list at python.org>
Cameron Simpson  <cs at zip.com.au> wrote:
>Facilities like feof() in C and eof in Pascal already lead to lots of
>code that runs happily with flat files and behaves badly in interactive
>or piped input. It is _so_ easy to adopt a style like:
>
>  while not eof(filehandle):
>    line = filehandle.nextline()
>    ...

Minor but important point here: eof() in Pascal is predictive (uses
a "crystal ball" to peer into the future to see whether EOF is is
about to occur -- which really means, reads ahead, causing that
interactivity problem you mentioned), but feof() in C is "post-dictive".
The feof(stream) function returns a false value if the stream has
not yet encountered an EOF, but your very next attempt to read from
it may (or may not) immediately encounter that EOF.

Thus, feof() in C is sort of (but not really) useless.  (The actual
use cases are to distinguish between "EOF" and "error" after a
failed read from a stream -- since C lacks exceptions, getc() just
returns EOF to indicate "failed to get a character due to end of
file or error" -- or in some more obscure cases, such as the
nonstandard getw(), to distinguish between a valid -1 value and
having encountered an EOF.  The companion ferror() function tells
you whether an earlier EOF value was due to an error.)
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40?39.22'N, 111?50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html


From rosuav at gmail.com  Thu Sep  8 10:26:03 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 00:26:03 +1000
Subject: wrap the queue to multiprocess download
In-Reply-To: <tencent_4166F0FA34A3622828C18134@qq.com>
References: <tencent_4166F0FA34A3622828C18134@qq.com>
Message-ID: <CAPTjJmoBuuzhb7s6WPeiSVKUWwpVO5LoYaJJLp21x8n6E9Jc=Q@mail.gmail.com>

On Fri, Sep 9, 2011 at 12:12 AM, alias <1248283536 at qq.com> wrote:
> ??? def? __init__(self,arg):
> ??????? for? x? in? name:
>
> ??? s=webdata('quote')

What you're doing here is iterating over the letters in the string
'quote'. It's adding one job for each letter. Is that your intention?

ChrisA


From python at mrabarnett.plus.com  Thu Sep  8 11:06:11 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 16:06:11 +0100
Subject: how to make fxn argument work with setting a field value
In-Reply-To: <c95f57a0-1c55-45ea-9123-cb252e8657ae@i21g2000yqd.googlegroups.com>
References: <7732a253-c834-4578-93eb-930346247e57@b20g2000vbz.googlegroups.com>
	<mailman.861.1315447873.27778.python-list@python.org>
	<c95f57a0-1c55-45ea-9123-cb252e8657ae@i21g2000yqd.googlegroups.com>
Message-ID: <4E68D9E3.8060403@mrabarnett.plus.com>

On 08/09/2011 08:59, noydb wrote:
>> The documentation mentions "getValue" and "setValue":
>>
>> http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002z00...- Hide quoted text -
>>
>> - Show quoted text -
>
> I have tried row.setValue(rankFld) = i for line 14.  Get syntax error
> - cant assign to function call

Of course you can't assign to a function call!

It's:

     row.setValue(rankFld, value)

and:

     value = row.getValue(rankFld)


From steve+comp.lang.python at pearwood.info  Thu Sep  8 11:11:28 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 01:11:28 +1000
Subject: Create an index from a webpage
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
Message-ID: <4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>

Thomas 'PointedEars' Lahn wrote:

> <http://lmgtfy.com/?q=python+sitemap>

[climbs up on the soapbox and begins rant]

Please don't use lmgtfy. The joke, such as it is, stopped being funny about
three years ago. It's just annoying, and besides, it doesn't even work
without Javascript. Kids today have no respect, get off my lawn, grump
grump grump...

It's no harder to put the search terms into a google URL, which still gets
the point across without being a dick about it:

www.google.com/search?q=python+sitemap

[ends rant, climbs back down off soapbox]

Or better still, use a search engine that doesn't track and bubble your
searches:

https://duckduckgo.com/html/?q=python+sitemap

You can even LMDDGTFY if you insist.

http://lmddgtfy.com/


Completely-undermining-my-own-message-ly y'rs, 


-- 
Steven



From python at mrabarnett.plus.com  Thu Sep  8 11:25:53 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 16:25:53 +0100
Subject: my  multi-download program can't finish
In-Reply-To: <tencent_0BE9496E443609034B36FE07@qq.com>
References: <tencent_0BE9496E443609034B36FE07@qq.com>
Message-ID: <4E68DE81.5060809@mrabarnett.plus.com>

On 08/09/2011 05:24, ???? wrote:
> here is the program,
>
> # basic structure,omit something
> import Queue
> import httplib2
> import threading
> jobs = Queue.Queue()
> name=something   #omit ,it is a web list to download
> for  x  in  name:
>   jobs.put(x)
>
> def download():
>     while not jobs.empty():
>             try:
>                 url = jobs.get()
>                 hx = httplib2.Http()
>                 resp, content = hx.request(url, headers=headers)
>                 jobs.task_done()
>             except:
>                 print  "wrong" , url
>
> if __name__ == '__main__':
>
>     for i in range(10):
>           threading.Thread(target=download).start()
>     jobs.join()
>
> when it run ,it can download someting ,
> it is strang:there is wrong output ,some web can't get,but  the 
> program can't stop,it stay ,run ,can't fininsh,
> i don't know why?
>
The line:

jobs.join()

will wait until every job has been marked as done by:

jobs.task_done()

In function "download", if there's an exception, it will go to the 
exception handler and print a message, but there's no:

jobs.task_done()

there to tell the queue that the job has been done.

You need to tell it when a job has been processed. It doesn't care 
whether a job succeeded or failed, only whether it has been processed.


From ssegvic at zemris.fer.hr  Thu Sep  8 11:39:42 2011
From: ssegvic at zemris.fer.hr (=?utf-8?Q?Sini=C5=A1a_=C5=A0egvi=C4=87?=)
Date: Thu, 8 Sep 2011 17:39:42 +0200 (CEST)
Subject: Portable locale usage
In-Reply-To: <4E687FB2.9020908@shopzeus.com>
Message-ID: <1468943535.28842.1315496382655.JavaMail.root@mail.zemris.fer.hr>

> From: "Laszlo Nagy" <gandalf at shopzeus.com>
> To: "Sini?a ?egvi?" <ssegvic at zemris.fer.hr>, python-list at python.org
> Sent: Thursday, September 8, 2011 10:41:22 AM
> Subject: Re: Portable locale usage
> > I have set the system-wide locale to Croatian (Croatia)
> > on my development system as instructed by:
> > http://windows.microsoft.com/en-US/windows-vista/Change-the-system-locale
> >
> > Nevertheless, your proposal produces:
> > ('English_United States','1252')
> This is what I see on my Hungarian Windows:
> 
> 
> C:\Users\User>python
> Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit
> (AMD64)] on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import locale
> >>> locale.setlocale(locale.LC_ALL, '')
> 'Hungarian_Hungary.1250'
> >>> locale.getlocale()
> ('Hungarian_Hungary', '1250')
> >>>
> 
> So I'm 100% sure that the problem is with your system locale settings,
> not Python.

I've just found out how to set the user locale on Windows.

One has to go to Control panel -> Regional and language options,
then select the tab named Formats, and finally 
set the box Current format to the desired language, 
which is in my case Croatian (Croatia).

The whole tab says nothing about locales, I found this by try and test.
This recipe is not affected by the system locale (which I was setting before)!

Now locale.setlocale(locale.LC_ALL, '') sets the Croatian locale.

> > I expect that most of my Windows users will not care
> > to configure their computers with the national locale
> > (and besides, that does not seem to work, anyway).
> Croatian users will most likely use a Croatian Windows, out of the
> box.
> And on those systems, using locale.setlocale(locale.LC_ALL, '') will
> work perfectly. 

Yes it's true, you were right, I was setting 
the Croatian language at the wrong place
(I am not a Windows fan neither, I normally work on Linux).

However, I am not completely happy with this.
OK, no need for system restart, but still,
it would be nice if Python program could
manage around this by itself, 
of course, provided that the required locale is installed.

> > Note that I would very much like
> > to avoid changing the system locale
> > (this requires Administrator password and system restart).
> All right. But you understand, that Croatian ISO8859-2 is not
> supported on windows? 

Yes I do understand that.

I have commented that the Python's locale aliasing engine
should not propose iso8859-2 on Windows systems,
exactly for the reason you mention.


> >> Why are you trying to force a specific locale to your program
> >> anyway?
> > Because I wish to be able to correctly sort Croatian names.
> Well, all right. If you want to sort Croatian names from a program that
> runs on an English (or whatever) system, then you will have to check the
> platform and use a locale that is supported by the platform. (But again,
> this is not Python's limitation. Python doesn't know what encodings are
> supported, in advance, and you cannot use a locale that is not supported...)

I fully agree.

I commented that, if a proper locale is installed,
the following should work on any system:

locale.setlocale(locale.LC_ALL, ('hr', locale.getpreferredencoding())) 

Currently the above does not work on Windows,
and that is because the locale_alias for 'hr'
is bound to 'hr_HR.ISO8859-2'.
Check the source: .../Python-3.2.2/Lib/locale.py, line 537

I was arguing that, on a Windows system, 
the locale_alias for 'hr' should be bound 
to 'Croatian_Croatia.1250'.

Cheers,

Sinisa


From ericsnowcurrently at gmail.com  Thu Sep  8 12:44:04 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Thu, 8 Sep 2011 10:44:04 -0600
Subject: DRY and class variables
In-Reply-To: <20110908095502.GA3637@xs4all.nl>
References: <20110908095502.GA3637@xs4all.nl>
Message-ID: <CALFfu7DTu_BuHJiHxOxT2RkqbXp0nrqw62JZN5cu7zrHUizE9A@mail.gmail.com>

On Thu, Sep 8, 2011 at 3:55 AM, egbert <egbertum at xs4all.nl> wrote:
> My classes correspond to sql tables.
> In these classes I want to have several class variables
> that refer to data that are common to all instances.
>
> The assignment statements for the class variables are the same
> in all classes, except that of these instructions needs the name
> of the class itself. That name is used to read a file with meta-data.
>
> So what I have now is something like this (simplified):
>
> class TableOne(object):
> ? ?m = Metadata('TableOne')
> ? ?m.do_something()
> ? ?def __init__(self):
> ? ? ? ?etc
>
> class TableTwo(object):
> ? ?m = Metadata('TableTwo')
> ? ?m.do_something()
> ? ?def __init__(self):
> ? ? ? ?etc
>
> I have tried:
> - to eliminate the class name argument, but in this phase of the
> ?object creation __class__ and __name__ are not available
> - to move the two statements to a superclass, but the class variables
> ?come in the superclass namespace, not in the subclass namespace.
>
> Any ideas ?

Definitely an interesting problem I've run into before.  Here are two solutions:

1. in Python 3, use the metaclass __prepare__()  (see
http://code.activestate.com/recipes/577813/);
2. in Python 2 or 3, use a descriptor to defer creating your Metadata
objects until after the class object is available (see
http://code.activestate.com/recipes/577745/).

HTH

-eric

> e
> --
> Egbert Bouwman - Keizersgracht 197 II - 1016 DS ?Amsterdam - 020 6257991
> ========================================================================
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tavares at fe.up.pt  Thu Sep  8 15:29:57 2011
From: tavares at fe.up.pt (tavares at fe.up.pt)
Date: Thu, 8 Sep 2011 12:29:57 -0700 (PDT)
Subject: =?windows-1252?Q?Symposium_=93Experimental_and_Computational_Bio=2DImag?=
	=?windows-1252?Q?ing_and_Visualization=94_within_ICEM15_=96_Announce_=26_Call_f?=
	=?windows-1252?Q?or_Papers?=
Message-ID: <839676a0-6525-4d74-8232-205ca9100001@cd4g2000vbb.googlegroups.com>

Dear Colleague,

Within the 15th International Conference on Experimental Mechanics
(ICEM15), to be held in Faculty of Engineering, University of Porto,
Porto, Portugal, in July 22-27, 2012, (www.fe.up.pt/clme/icem15/
index.htm), we are organizing a Symposium on ?Experimental and
Computational Bio-Imaging and Visualization?.
The main goal of the Symposium ?Experimental and Computational Bio-
Imaging and Visualization? is to bring together researchers,
developers and clinicians involved in the related fields of Bio-
Imaging and Visualization, including Biomechanics, Experimental
Biomechanics, Image Processing and Analysis, Medical Imaging,
Mechanobiology, Tissues Engineering, Scientific Visualization and
Software and Hardware Development, in order to set the major lines of
development for the near future and establish a bridge between them.

INSTRUCTIONS & SUBMISSION:

- For instructions and submission, please access to the conference
website at:
www.fe.up.pt/clme/icem15/index.htm;
- Please, note that, when submitting your work, you should indicate
the Symposium ?Experimental and Computational Bio-Imaging and
Visualization?.

IMPORTANT DATES:

- Submission of abstracts: 30 November, 2011;
- Notification of acceptance: 13 January, 2012;
- Submission of full-papers: 16 March, 2012.

Kind regards,

Jo?o Manuel R. S. Tavares (University of Porto, Portugal,
tavares at fe.up.pt)
Yongjie Zhang (Carnegie Mellon University, USA,
jessicaz at andrew.cmu.edu)
(Symposium organizers)


From georgeryoung at gmail.com  Thu Sep  8 15:51:17 2011
From: georgeryoung at gmail.com (gry)
Date: Thu, 8 Sep 2011 12:51:17 -0700 (PDT)
Subject: replace random matches of regexp
Message-ID: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>

[Python 2.7]
I have a body of text (~1MB) that I need to modify.   I need to look
for matches of a regular expression and replace a random selection of
those matches with a new string.  There may be several matches on any
line, and a random selection of them should be replaced.  The
probability of replacement should be adjustable.  Performance is not
an issue.  E.g: if I have:

SELECT max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
(PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON (ceil(0.46)
=sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I) =
sqrt((0.02 + PUBLIC_TT_1.F))) OR

I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
only with probability 0.7.  I looked and looked for some computed
thing in re's that I could stick and expression, but could not find
such(for good reasons, I know).
Any ideas how to do this?  I would go for simple, even if it's wildly
inefficient, though elegance is always admired...


From python at mrabarnett.plus.com  Thu Sep  8 16:12:34 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 08 Sep 2011 21:12:34 +0100
Subject: replace random matches of regexp
In-Reply-To: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <4E6921B2.2010300@mrabarnett.plus.com>

On 08/09/2011 20:51, gry wrote:
> [Python 2.7]
> I have a body of text (~1MB) that I need to modify.   I need to look
> for matches of a regular expression and replace a random selection of
> those matches with a new string.  There may be several matches on any
> line, and a random selection of them should be replaced.  The
> probability of replacement should be adjustable.  Performance is not
> an issue.  E.g: if I have:
>
> SELECT max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
> PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
> PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
> (PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON (ceil(0.46)
> =sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I) =
> sqrt((0.02 + PUBLIC_TT_1.F))) OR
>
> I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
> only with probability 0.7.  I looked and looked for some computed
> thing in re's that I could stick and expression, but could not find
> such(for good reasons, I know).
> Any ideas how to do this?  I would go for simple, even if it's wildly
> inefficient, though elegance is always admired...

re.sub can accept a function as the replacement. It'll call the
function when it finds a match, and the string returned by that
function will be the replacement.

You could write a function which returns either the original substring
which was found or a different substring.


From ndparker at gmail.com  Thu Sep  8 16:18:00 2011
From: ndparker at gmail.com (=?UTF-8?B?QW5kcsOp?= Malo)
Date: Thu, 08 Sep 2011 22:18:00 +0200
Subject: replace random matches of regexp
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <10875052.MZNQO6iqsQ@news.perlig.de>

* gry wrote:

> I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
> only with probability 0.7.  I looked and looked for some computed
> thing in re's that I could stick and expression, but could not find
> such(for good reasons, I know).
> Any ideas how to do this?  I would go for simple, even if it's wildly
> inefficient, though elegance is always admired...

You can run a re.sub() with a function as replacement value. This function
then either returns the replacement or the original match based on a
weighted random value.

nd
-- 
"Umfassendes Werk (auch fuer Umsteiger vom Apache 1.3)"
                                          -- aus einer Rezension

<http://pub.perlig.de/books.html#apache2>


From __peter__ at web.de  Thu Sep  8 16:43:15 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 08 Sep 2011 22:43:15 +0200
Subject: replace random matches of regexp
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <j4b9cs$ebv$1@dough.gmane.org>

gry wrote:

> [Python 2.7]
> I have a body of text (~1MB) that I need to modify.   I need to look
> for matches of a regular expression and replace a random selection of
> those matches with a new string.  There may be several matches on any
> line, and a random selection of them should be replaced.  The
> probability of replacement should be adjustable.  Performance is not
> an issue.  E.g: if I have:
> 
> SELECT max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
> PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
> PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
> (PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON (ceil(0.46)
> =sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I) =
> sqrt((0.02 + PUBLIC_TT_1.F))) OR
> 
> I might want to replace '(max|min|cos|sqrt|ceil' with "public.\1", but
> only with probability 0.7.  I looked and looked for some computed
> thing in re's that I could stick and expression, but could not find
> such(for good reasons, I know).
> Any ideas how to do this?  I would go for simple, even if it's wildly
> inefficient, though elegance is always admired...

def make_sub(text, probability):
    def sub(match):
        if random.random() < probability:
            return text + match.group(1)
        return match.group(1)
    return sub

print re.compile("(max|min|cos|sqrt|ceil)").sub(make_sub(r"public.", .7), 
sample)

or even

def make_sub(text, probability):
    def sub(match):
        if random.random() < probability:
            def group_sub(m):
                return match.group(int(m.group(1)))
            return re.compile(r"[\\](\d+)").sub(group_sub, text)
        return match.group(0)
    return sub

print re.compile("(max|min|cos|sqrt|ceil)").sub(make_sub(r"public.\1", .7), 
sample)




From egbertum at xs4all.nl  Thu Sep  8 16:53:35 2011
From: egbertum at xs4all.nl (egbert)
Date: Thu, 8 Sep 2011 22:53:35 +0200
Subject: DRY and class variables
In-Reply-To: <4E689769.3050701@jollybox.de>
References: <20110908095502.GA3637@xs4all.nl>
 <4E689769.3050701@jollybox.de>
Message-ID: <20110908205335.GA18306@xs4all.nl>

On Thu, Sep 08, 2011 at 12:22:33PM +0200, Thomas Jollans wrote:
> You should be able to do this with a metaclass (almost certainly
> overkill), or with a class decorator (Python 2.6+):
> 
> def with_metadata (cls):
>     cls.m = Metadata (cls.__name__)
>     cls.m.do_something ()
>     return cls
> 
> @with_metadata
> class TableOne:
>    # foo
>    pass
Overnight I have become a decorator fan.
I can postpone the study of metaclasses.
Thanks.
e
-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From georgeryoung at gmail.com  Thu Sep  8 17:19:29 2011
From: georgeryoung at gmail.com (gry)
Date: Thu, 8 Sep 2011 14:19:29 -0700 (PDT)
Subject: replace random matches of regexp
References: <32cb758a-77de-4c56-9d7d-6f6db77b822f@u19g2000vbm.googlegroups.com>
Message-ID: <cf1590ab-2085-4739-816c-63ce1afd2ce2@h14g2000yqi.googlegroups.com>

On Sep 8, 3:51?pm, gry <georgeryo... at gmail.com> wrote:
To elaborate(always give example of desired output...) I would hope to
get something like:

SELECT public.max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
PUBLIC.TT.F) = cast(ceil((         SELECT 22 AS SEL_0        FROM
(PUBLIC.TT AS PUBLIC_TT_0 JOIN PUBLIC.TT AS PUBLIC_TT_1 ON
(public.ceil(0.46)
=public.sin(PUBLIC_TT_1.F)))        WHERE ((zeroifnull(PUBLIC_TT_0.I)
=
public.sqrt((0.02 + PUBLIC_TT_1.F))) OR

notice the 'ceil' on the third line did not get changed.


From paul.hermeneutic at gmail.com  Thu Sep  8 18:29:39 2011
From: paul.hermeneutic at gmail.com (Paul Watson)
Date: Thu, 08 Sep 2011 16:29:39 -0600
Subject: Django or web2py
Message-ID: <9cstuhFnm0U1@mid.individual.net>

I have read some of the talk around these two frameworks.

Would you say that web2py is more geared toward the enterprise?

Which one do you believe will be on Python 3 more quickly?


From cs at zip.com.au  Thu Sep  8 18:39:44 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 9 Sep 2011 08:39:44 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <j4aj1302fg0@news3.newsguy.com>
References: <j4aj1302fg0@news3.newsguy.com>
Message-ID: <20110908223944.GA28756@cskk.homeip.net>

On 08Sep2011 14:21, Chris Torek <nospam at torek.net> wrote:
| In article <mailman.854.1315441399.27778.python-list at python.org>
| Cameron Simpson  <cs at zip.com.au> wrote:
| >Facilities like feof() in C and eof in Pascal already lead to lots of
| >code that runs happily with flat files and behaves badly in interactive
| >or piped input. It is _so_ easy to adopt a style like:
| >
| >  while not eof(filehandle):
| >    line = filehandle.nextline()
| >    ...
| 
| Minor but important point here: eof() in Pascal is predictive (uses
| a "crystal ball" to peer into the future to see whether EOF is is
| about to occur -- which really means, reads ahead, causing that
| interactivity problem you mentioned), but feof() in C is "post-dictive".
| The feof(stream) function returns a false value if the stream has
| not yet encountered an EOF, but your very next attempt to read from
| it may (or may not) immediately encounter that EOF.

Thanks. I had forgotten this nuance. Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

                          "Where am I?"
                        "In the Village."
                       "What do you want?"
                         "Information."
                    "Whose side are you on?"
"That would be telling. We want information. Information. Information!"
                       "You won't get it!"
                 "By hook or by crook, we will."
                         "Who are you?"
                       "The new number 2."
                       "Who is number 1?"
                       "You are number 6."
              "I am not a number, I am a free man!"
                           [Laughter]


From abhishek.vit at gmail.com  Thu Sep  8 18:49:51 2011
From: abhishek.vit at gmail.com (Abhishek Pratap)
Date: Thu, 8 Sep 2011 15:49:51 -0700
Subject: Processing a file using multithreads
Message-ID: <CAJbA1KCJ4484icWmThLYUewWk6BGf=HZemVtfeOdOva7=c3YyA@mail.gmail.com>

Hi Guys

My experience with python is 2 days and I am looking for a slick way
to use multi-threading to process a file. Here is what I would like to
do which is somewhat similar to MapReduce in concept.

# test case

1. My input file is 10 GB.
2. I want to open 10 file handles each handling 1 GB of the file
3. Each file handle is processed in by an individual thread using the
same function ( so total 10 cores are assumed to be available on the
machine)
4. There will be 10 different output files
5. once the 10 jobs are complete a reduce kind of function will
combine the output.

Could you give some ideas ?

So given a file I would like to read it in #N chunks through #N file
handles and process each of them separately.

Best,
-Abhi


From simoncropper at fossworkflowguides.com  Thu Sep  8 19:40:42 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 09:40:42 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E69527A.20608@fossworkflowguides.com>

On 09/09/11 01:11, Steven D'Aprano wrote:
> [SNIP]
> It's no harder to put the search terms into a google URL, which still gets
> the point across without being a dick about it:
 > [SNIP]

[RANT]

OK I was not going to say anything but...

1. Being told to google-it when I explicitly stated in my initial post 
that I had been doing this and had not been able to find anything is 
just plain rude. It is unconstructive and irritating.

2. I presume that python-list is a mail list for python users - 
beginners, intermediate and advanced. If it is not then tell me and I 
will go somewhere else.

3. Some searches, particularly for common terms throw millions of hits. 
'Python' returns 147,000,000 results on google, 'Sitemap' returns 
1,410,000,000 results. Even 'Python AND Sitemap' still returns 5,020 
results. Working through these links takes you round and round with no 
clear solutions. Asking for help on the primary python mail list -- 
after conducting a preliminary investigation for tools, libraries, code 
snippets seemed legitimate.

4. AND YES, I could write a program but why recreate code when there is 
a strong likelihood that code already exists. One of the advantages of 
python is that a lot of code is redistributed under licences that 
promote reuse. So why reinvent the wheel when their is a library full of 
code. Sometimes you just need help finding the door.

4. If someone is willing to help me, rather than lecture me (or poke me 
to see if they get a response), I would appreciate it.

[END RANT]

For people that are willing to help. My original request was...

I am after a way of pointing a python routine to my website and have it
create a tree, represented as a hierarchical HTML list in a webpage, of
all the pages in that website (recursive list of internal links to HTML
documents; ignore images, etc.).

In subsequent notes to Thomas 'PointedEars'...

I pointed to an example of the desired output here 
http://lxml.de/sitemap.html

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From cs at zip.com.au  Thu Sep  8 20:03:34 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 9 Sep 2011 10:03:34 +1000
Subject: killing a script
In-Reply-To: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110909000334.GA9300@cskk.homeip.net>

On 30Aug2011 14:13, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
| On Tue, 30 Aug 2011 08:53 am Arnaud Delobelle wrote:
| >> Yes, but if I am not mistaken, that will require me to put a line or
| >> two after each os.system call. That's almost like whack-a-mole at the
| >> code level rather than the Control-C level. OK, not a huge deal for
| >> one script, but I was hoping for something simpler. I was hoping I
| >> could put one line at the top of the script and be done with it.
| > 
| > Write a function!  That's what they're for after all :)
| 
| I'm not sure that this is actually as simple as that, especially using
| os.system.
| 
| As I understand it, the scenario is this:
| 
| The main script looks something like this:
| 
| for x in whatever:
|     os.system('something.py x')
| 
| Each time through the loop, a new Python process is started. Each process
| runs in the foreground, capturing standard input, and so hitting Ctrl-C
| kills *that* process, not the main script. Unless, by chance, the Ctrl-C
| happens after the system call returns, but before the next one starts, it
| is completely invisible to the parent process (the main script). Wrapping
| os.system in a function does nothing to fix that.

Presuming you're talking about UNIX, this is not correct.

Ctrl-C at the terminal delivers SIGINT to _every_ process in the controlling
process group for the terminal. It also has _nothing_ to do with the standard
input.

When you run a script, yea even a Python script, thus:

  myscript ...

then job control capable shells (all of them, these days) put the python
process running "myscript" in its own process group as the leader
(being, initially, the only process in the group). If myscript forks
other processes, as happens in os.system(), they are _also_ in that
process group. _ALL_ of them receive the SIGINT from your Ctrl-C.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

DRM: the functionality of refusing to function. - Richard Stallman


From greg.ewing at canterbury.ac.nz  Thu Sep  8 20:03:45 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 09 Sep 2011 12:03:45 +1200
Subject: Processing a file using multithreads
In-Reply-To: <mailman.885.1315522214.27778.python-list@python.org>
References: <mailman.885.1315522214.27778.python-list@python.org>
Message-ID: <9ct3f4FuvnU1@mid.individual.net>

Abhishek Pratap wrote:

> 3. Each file handle is processed in by an individual thread using the
> same function ( so total 10 cores are assumed to be available on the
> machine)

Are you expecting the processing to be CPU bound or
I/O bound?

If it's I/O bound, multiple cores won't help you, and
neither will threading, because it's the disk doing the
work, not the CPU.

If it's CPU bound, multiple threads in one Python process
won't help, because of the GIL. You'll have to fork
multiple OS processes in order to get Python code running
in parallel on different cores.

-- 
Greg


From rhodri at wildebst.demon.co.uk  Thu Sep  8 20:32:42 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 09 Sep 2011 01:32:42 +0100
Subject: Create an index from a webpage [RANT, DNFTT]
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
Message-ID: <op.v1imgsvpa8ncjz@gnudebst>

On Fri, 09 Sep 2011 00:40:42 +0100, Simon Cropper  
<simoncropper at fossworkflowguides.com> wrote:

> On 09/09/11 01:11, Steven D'Aprano wrote:
>> [SNIP]
>> It's no harder to put the search terms into a google URL, which still  
>> gets
>> the point across without being a dick about it:
>  > [SNIP]
>
> [RANT]
>
> OK I was not going to say anything but...

Ahem.  You should expect a certain amount of ribbing after admitting that  
your Google-fu is weak.  So is mine, but hey.

> 4. If someone is willing to help me, rather than lecture me (or poke me  
> to see if they get a response), I would appreciate it.

The Google Python Sitemap Generator  
(http://www.smart-it-consulting.com/article.htm?node=166&page=128, fourth  
offering when you google "map a website with Python") looks like a  
promising start.  At least it produces something in XML -- filtering that  
and turning it into HTML should be fairly straightforward.


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


From nobody at nowhere.com  Thu Sep  8 20:45:42 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 09 Sep 2011 01:45:42 +0100
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.09.00.45.41.959000@nowhere.com>

On Thu, 08 Sep 2011 10:29:26 +1000, Steven D'Aprano wrote:

> I suppose "one class per file" might be useful for those using an editor
> with no search functionality. Other than that, is there any justification
> for this rule? Any Java fans want to defend this?

Not a Java fan, but:

The Java compiler also acts as a "make" program. If it doesn't find
a .class file for a needed class, it will search for the corresponding
.java file and compile that. So to compile a complex program, you only
need to compile the top-level file (e.g. HelloWorld.java), and it will
compile everything which is required. No Makefile is needed, as the
relationship between classes, object files and source files is fixed.



From prachar at gmail.com  Thu Sep  8 21:09:31 2011
From: prachar at gmail.com (papu)
Date: Thu, 8 Sep 2011 18:09:31 -0700 (PDT)
Subject: Python: Deleting specific words from a file.
Message-ID: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>

Hello, I have a data file (un-structed messy file) from which I have
to scrub specific list of words (delete words).

Here is what I am doing but with no result:

infile = "messy_data_file.txt"
outfile = "cleaned_file.txt"

delete_list = ["word_1","word_2"....,"word_n"]
new_file = []
fin=open(infile,"")
fout = open(outfile,"w+")
for line in fin:
    for word in delete_list:
        line.replace(word, "")
    fout.write(line)
fin.close()
fout.close()

I have put the code above in a file. When I execute it, I dont see the
result file. I am not sure what the error is. Please let me know what
I am doing wrong.


From python at mrabarnett.plus.com  Thu Sep  8 21:31:23 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 09 Sep 2011 02:31:23 +0100
Subject: Python: Deleting specific words from a file.
In-Reply-To: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
Message-ID: <4E696C6B.7080609@mrabarnett.plus.com>

On 09/09/2011 02:09, papu wrote:
> Hello, I have a data file (un-structed messy file) from which I have
> to scrub specific list of words (delete words).
>
> Here is what I am doing but with no result:
>
> infile = "messy_data_file.txt"
> outfile = "cleaned_file.txt"
>
> delete_list = ["word_1","word_2"....,"word_n"]
> new_file = []
> fin=open(infile,"")
> fout = open(outfile,"w+")
> for line in fin:
>      for word in delete_list:
>          line.replace(word, "")
>      fout.write(line)
> fin.close()
> fout.close()
>
> I have put the code above in a file. When I execute it, I dont see the
> result file. I am not sure what the error is. Please let me know what
> I am doing wrong.

The .replace method _returns_ its result.

Strings are immutable, they can't be changed in-place.


From davea at ieee.org  Thu Sep  8 21:34:16 2011
From: davea at ieee.org (Dave Angel)
Date: Thu, 08 Sep 2011 21:34:16 -0400
Subject: Processing a file using multithreads
In-Reply-To: <CAJbA1KCJ4484icWmThLYUewWk6BGf=HZemVtfeOdOva7=c3YyA@mail.gmail.com>
References: <CAJbA1KCJ4484icWmThLYUewWk6BGf=HZemVtfeOdOva7=c3YyA@mail.gmail.com>
Message-ID: <4E696D18.807@ieee.org>

On 01/-10/-28163 02:59 PM, Abhishek Pratap wrote:
> Hi Guys
>
> My experience with python is 2 days and I am looking for a slick way
> to use multi-threading to process a file. Here is what I would like to
> do which is somewhat similar to MapReduce in concept.
>
> # test case
>
> 1. My input file is 10 GB.
> 2. I want to open 10 file handles each handling 1 GB of the file
> 3. Each file handle is processed in by an individual thread using the
> same function ( so total 10 cores are assumed to be available on the
> machine)
> 4. There will be 10 different output files
> 5. once the 10 jobs are complete a reduce kind of function will
> combine the output.
>
> Could you give some ideas ?
>
> So given a file I would like to read it in #N chunks through #N file
> handles and process each of them separately.
>
> Best,
> -Abhi
>
You should probably forget threads, and simply do them as 10 separate 
processes, all launched by a single parent.  Since they don't share any 
state, there's no need to get the inefficiency of threads.

DaveA


From rosuav at gmail.com  Thu Sep  8 21:37:44 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 11:37:44 +1000
Subject: How to structure packages
In-Reply-To: <pan.2011.09.09.00.45.41.959000@nowhere.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
Message-ID: <CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>

On Fri, Sep 9, 2011 at 10:45 AM, Nobody <nobody at nowhere.com> wrote:
> The Java compiler also acts as a "make" program. If it doesn't find
> a .class file for a needed class, it will search for the corresponding
> .java file and compile that. So to compile a complex program, you only
> need to compile the top-level file (e.g. HelloWorld.java), and it will
> compile everything which is required. No Makefile is needed, as the
> relationship between classes, object files and source files is fixed.
>

If that's the entire benefit, then I think this is a rather hefty
price to pay for the elimination of a makefile. Oh wow, I can type
"javac MyClass.java" and it picks up all the others! If you're
dividing a project into multiple files already, is it that hard to
have one more that defines the relationships between the others?

Chris Angelico


From simoncropper at fossworkflowguides.com  Thu Sep  8 22:09:58 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 12:09:58 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <op.v1imgsvpa8ncjz@gnudebst>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>
	<op.v1imgsvpa8ncjz@gnudebst>
Message-ID: <4E697576.5030301@fossworkflowguides.com>

On 09/09/11 10:32, Rhodri James wrote:
> On Fri, 09 Sep 2011 00:40:42 +0100, Simon Cropper
>
> Ahem. You should expect a certain amount of ribbing after admitting that
> your Google-fu is weak. So is mine, but hey.

I did not admit anything. I consider my ability to find this quite good 
actually. Others assumed that my "Google-fu is weak".

>
>> 4. If someone is willing to help me, rather than lecture me (or poke
>> me to see if they get a response), I would appreciate it.
>
> The Google Python Sitemap Generator
> (http://www.smart-it-consulting.com/article.htm?node=166&page=128,
> fourth offering when you google "map a website with Python") looks like
> a promising start. At least it produces something in XML -- filtering
> that and turning it into HTML should be fairly straightforward.
>

I saw this in my original search. My conclusions were..

1. The last update was in 2005. That is 6 years ago. In that time we 
have had numerous upgrades to HTML, Logs, etc.
2. The script expects to run on the webserver. I don't have the ability 
to run python on my webserver.
3. There are also a number of dead-links and redirects to Google 
Webmaster Central / Tools, which then request you submit a sitemap (as I 
alluded we get into a circular confusing cross-referencing situation)
4. The ultimate product - if you can get the package to work - would be 
a XML file you would need to massage to extract what you needed.

To me this seems like overkill.

I assume you could import the parent html file, scrap all the links on 
the same domain, dump these to a hierarchical list and represent this in 
HTML using BeautifulSoup or something similar. Certainly doable but 
considering the shear commonality of this task I don't understand why a 
simple script does not already exist - hence my original request for 
assistance.

It would appear from the feedback so far this 'forum' is not the most 
appropriate to ask this question. Consequently, I will take your advice 
and keep looking... and if I don't find something within a reasonable 
time frame, just write something myself.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From steve+comp.lang.python at pearwood.info  Thu Sep  8 22:14:55 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 12:14:55 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
Message-ID: <4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>

Simon Cropper wrote:

> 1. Being told to google-it when I explicitly stated in my initial post
> that I had been doing this and had not been able to find anything is
> just plain rude. It is unconstructive and irritating.

Why so you did. Even though I wasn't the one who told you to google it, I'll
apologise too because I was thinking the same thing. Sorry about that.


> 3. Some searches, particularly for common terms throw millions of hits.
> 'Python' returns 147,000,000 results on google, 'Sitemap' returns
> 1,410,000,000 results. Even 'Python AND Sitemap' still returns 5,020
> results. 

How about "python generate a site map"? The very first link on DuckDuckGo is
this:

http://www.conversationmarketing.com/2010/08/python-sitemap-crawler-1.htm

Despite the domain, there is actual Python code on the page. Unfortunately
it looks like crappy code with broken formatting and a mix of <\br> tags,
but it's a start.

Searching for "site map" on PyPI returns a page full of hits:

http://pypi.python.org/pypi?%3Aaction=search&term=site+map&submit=search

Most of them seem to rely on a framework like Django etc, but you might find
something useful.


> 4. AND YES, I could write a program but why recreate code when there is
> a strong likelihood that code already exists.

"Strong" likelihood? Given how hard it is to find an appropriate sitemap
generator written in Python, I'd say there is a strong likelihood that one
that meets your needs and is publicly available under an appropriate
licence is vanishingly small.

If you do decide to write your own, please consider uploading it to PyPI
under a FOSS licence.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep  8 22:16:12 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 12:16:12 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>
	<op.v1imgsvpa8ncjz@gnudebst>
	<mailman.891.1315534207.27778.python-list@python.org>
Message-ID: <4e6976ec$0$29987$c3e8da3$5496439d@news.astraweb.com>

Simon Cropper wrote:

> Certainly doable but
> considering the shear commonality of this task I don't understand why a
> simple script does not already exist

Perhaps it isn't as common or as simple as you believe.



-- 
Steven



From simoncropper at fossworkflowguides.com  Thu Sep  8 22:43:58 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 12:43:58 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>
	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E697D6E.4010101@fossworkflowguides.com>

On 09/09/11 12:14, Steven D'Aprano wrote:
> If you do decide to write your own, please consider uploading it to PyPI
> under a FOSS licence.

At present I am definitely getting the impression that my assumption 
that something like this' must out there', is wrong.

I am following people's links and suggestions (as well as my own; I have 
spent 1-2 hours looking) but have not found anything that is able to be 
used with only minor adjustments.

I have found a XML-Sitemaps Generator at http://www.xml-sitemaps.com,
this page allows you to create the XML files that can be uploaded to 
google. But as stated I don't actually want what people now call 
'sitemaps' I want a automatically updated 'index / contents page' to my 
website. For example, if I add a tutorial or update any of my links I 
want the 'global contents page' to be updated when the python script is run.

I am now considering how I might address this requirement. If I create a 
python script I will post it on PyPI. As with all my work it will be 
released under the GPLv3 licence.

Thanks for your help.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From chinakr at gmail.com  Thu Sep  8 22:47:04 2011
From: chinakr at gmail.com (chinakr)
Date: Thu, 8 Sep 2011 19:47:04 -0700 (PDT)
Subject: Using web2py and deck.js to make HTML5 presentation
Message-ID: <b2332141-dc07-47ec-8eb0-6f2431f499fb@x14g2000prn.googlegroups.com>

web2py is one of the most popular Web Frameworks. web2py has MVC
architecture, offering us excellent development efficiency and
extensibility. web2py is very suitable for Web application
development.

deck.js is a JavaScript library for making HTML5 presentation. It
supports keyboard navigation, themes switching and extensions. With
deck.js, making HTML5 presentation becomes easy, beautiful and
convinient.

SEO Brief Guide is a HTML5 presentation developing with web2py and
deck.js, wich is free and open source.

Demo?
http://openclass.vstudy.cn/seo/training

Source code?
http://vstudy.htexam.net/soft/download/web2py.app.openclass.w2p


From rosuav at gmail.com  Thu Sep  8 22:59:09 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 12:59:09 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4E697D6E.4010101@fossworkflowguides.com>
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<4E697D6E.4010101@fossworkflowguides.com>
Message-ID: <CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>

On Fri, Sep 9, 2011 at 12:43 PM, Simon Cropper
<simoncropper at fossworkflowguides.com> wrote:
> At present I am definitely getting the impression that my assumption that
> something like this' must out there', is wrong.
>
> I have found a XML-Sitemaps Generator at http://www.xml-sitemaps.com,
> this page allows you to create the XML files that can be uploaded to google.
> But as stated I don't actually want what people now call 'sitemaps' I want a
> automatically updated 'index / contents page' to my website. For example, if
> I add a tutorial or update any of my links I want the 'global contents page'
> to be updated when the python script is run.

What you're looking at may be closer to autogenerated documentation
than to a classic site map. There are a variety of tools that generate
HTML pages on the basis of *certain information found in* all the
files in a directory (as opposed to the entire content of those
files). What you're trying to do may be sufficiently specific that it
doesn't already exist, but it might be worth having a quick look at
autodoc/doxygen - at least for some ideas.

Chris Angelico


From gordon at panix.com  Thu Sep  8 23:16:13 2011
From: gordon at panix.com (John Gordon)
Date: Fri, 9 Sep 2011 03:16:13 +0000 (UTC)
Subject: Python: Deleting specific words from a file.
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
Message-ID: <j4c0ds$sv0$1@reader1.panix.com>

In <30f9b718-bb3c-4c92-8a03-0f760c993939 at a12g2000yqi.googlegroups.com> papu <prachar at gmail.com> writes:

> Hello, I have a data file (un-structed messy file) from which I have
> to scrub specific list of words (delete words).

> Here is what I am doing but with no result:

> infile = "messy_data_file.txt"
> outfile = "cleaned_file.txt"

> delete_list = ["word_1","word_2"....,"word_n"]
> new_file = []

What does new_file do?  I don't see it used anywhere.

> fin=open(infile,"")

There should be an "r" inside those quotes.  In fact this is an error
and it will stop your program from running.

> fout = open(outfile,"w+")

What is the "+" supposed to do?

> for line in fin:
>     for word in delete_list:
>         line.replace(word, "")

replace() returns the modified string; it does not alter the existing
string.

Do this instead:

  line = line.replace(word, "")

>     fout.write(line)
> fin.close()
> fout.close()

> I have put the code above in a file. When I execute it, I dont see the
> result file. I am not sure what the error is. Please let me know what
> I am doing wrong.

When you say you don't see the result file, do you mean it doesn't get
created at all?

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From jack.bates at gmail.com  Thu Sep  8 23:18:54 2011
From: jack.bates at gmail.com (Jack Bates)
Date: Thu, 8 Sep 2011 20:18:54 -0700
Subject: buffer() as argument to ctypes function which expects c_void_p?
Message-ID: <CAAuurfLUHpWvXk_yt9NxNzhZr-TUxjsqNSD2OmQs5DMSiXwY8w@mail.gmail.com>

How do you pass a Python buffer() value as an argument to a ctypes
function, which expects a c_void_p argument? I keep getting TypeError:

ctypes.ArgumentError: argument 2: <type 'exceptions.TypeError'>: wrong type


From simoncropper at fossworkflowguides.com  Thu Sep  8 23:20:01 2011
From: simoncropper at fossworkflowguides.com (Simon Cropper)
Date: Fri, 09 Sep 2011 13:20:01 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>
References: <mailman.874.1315484806.27778.python-list@python.org>	<1537032.qVoOGUtdWV@PointedEars.de>	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>	<mailman.886.1315525252.27778.python-list@python.org>	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>	<4E697D6E.4010101@fossworkflowguides.com>
	<CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>
Message-ID: <4E6985E1.9050009@fossworkflowguides.com>

On 09/09/11 12:59, Chris Angelico wrote:
> On Fri, Sep 9, 2011 at 12:43 PM, Simon Cropper
> <simoncropper at fossworkflowguides.com>  wrote:
>> At present I am definitely getting the impression that my assumption that
>> something like this' must out there', is wrong.
>>
>> I have found a XML-Sitemaps Generator at http://www.xml-sitemaps.com,
>> this page allows you to create the XML files that can be uploaded to google.
>> But as stated I don't actually want what people now call 'sitemaps' I want a
>> automatically updated 'index / contents page' to my website. For example, if
>> I add a tutorial or update any of my links I want the 'global contents page'
>> to be updated when the python script is run.
>
> What you're looking at may be closer to autogenerated documentation
> than to a classic site map. There are a variety of tools that generate
> HTML pages on the basis of *certain information found in* all the
> files in a directory (as opposed to the entire content of those
> files). What you're trying to do may be sufficiently specific that it
> doesn't already exist, but it might be worth having a quick look at
> autodoc/doxygen - at least for some ideas.
>
> Chris Angelico

Chris,

You assessment is correct. Working through the PyPI I am having better 
luck with using different terms than the old-term 'sitemap'.

I have found a link to funnelweb which uses the transmogrify library 
(yeah, as if I would have typed this term into google!) that is 
described as "Crawl and parse static sites and import to Plone".

http://pypi.python.org/pypi/funnelweb/1.0

As funnelweb is modular, using a variety of the transmogrify tools, 
maybe I could modify this to create a 'non-plone' version.

-- 
Cheers Simon

    Simon Cropper - Open Content Creator / Website Administrator

    Free and Open Source Software Workflow Guides
    ------------------------------------------------------------
    Introduction               http://www.fossworkflowguides.com
    GIS Packages               http://gis.fossworkflowguides.com
    bash / Python        http://scripting.fossworkflowguides.com


From rosuav at gmail.com  Thu Sep  8 23:46:25 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 13:46:25 +1000
Subject: Create an index from a webpage [RANT, DNFTT]
In-Reply-To: <4E6985E1.9050009@fossworkflowguides.com>
References: <mailman.874.1315484806.27778.python-list@python.org>
	<1537032.qVoOGUtdWV@PointedEars.de>
	<4e68db21$0$30002$c3e8da3$5496439d@news.astraweb.com>
	<mailman.886.1315525252.27778.python-list@python.org>
	<4e69769f$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<4E697D6E.4010101@fossworkflowguides.com>
	<CAPTjJmr-8Uv0syAzQFs_b2HOpS03FnY=FEf6WHsVd1eMesZfrg@mail.gmail.com>
	<4E6985E1.9050009@fossworkflowguides.com>
Message-ID: <CAPTjJmoQrgUDv1O7nMxeixx+0mrPX9zrYhtaLSe_jVUG_9LjJg@mail.gmail.com>

On Fri, Sep 9, 2011 at 1:20 PM, Simon Cropper
<simoncropper at fossworkflowguides.com> wrote:
> Chris,
>
> You assessment is correct. Working through the PyPI I am having better luck
> with using different terms than the old-term 'sitemap'.
>
> I have found a link to funnelweb which uses the transmogrify library (yeah,
> as if I would have typed this term into google!) that is described as "Crawl
> and parse static sites and import to Plone".
>

And once again, python-list has turned a rant into a useful,
informative, and productive thread :)

ChrisA


From aspineux at gmail.com  Fri Sep  9 00:44:34 2011
From: aspineux at gmail.com (aspineux)
Date: Thu, 8 Sep 2011 21:44:34 -0700 (PDT)
Subject: Processing a file using multithreads
References: <mailman.885.1315522214.27778.python-list@python.org>
Message-ID: <c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>

On Sep 9, 12:49?am, Abhishek Pratap <abhishek.... at gmail.com> wrote:
> Hi Guys
>
> My experience with python is 2 days and I am looking for a slick way
> to use multi-threading to process a file. Here is what I would like to
> do which is somewhat similar to MapReduce in concept.
>
> # test case
>
> 1. My input file is 10 GB.
> 2. I want to open 10 file handles each handling 1 GB of the file
> 3. Each file handle is processed in by an individual thread using the
> same function ( so total 10 cores are assumed to be available on the
> machine)
> 4. There will be 10 different output files
> 5. once the 10 jobs are complete a reduce kind of function will
> combine the output.
>
> Could you give some ideas ?

You can use "multiprocessing" module instead of thread to bypass the
GIL limitation.

First cut your file in 10 "equal" parts. If it is line based search
for the first line
close to the cut. Be sure to have "start" and "end" for each parts,
start is the address of the
first character of the first line and end is one line too much (==
start of the next block)

Then use this function to handle each part .

def handle(filename, start, end)
  f=open(filename)
  f.seek(start)
  for l in f:
    start+=len(l)
    if start>=end:
      break
    # handle line l here
    print l

Do it first in a single process/thread to be sure this is ok (easier
to debug) then split in multi processes


>
> So given a file I would like to read it in #N chunks through #N file
> handles and process each of them separately.
>
> Best,
> -Abhi



From vineet.deodhar at gmail.com  Fri Sep  9 00:52:26 2011
From: vineet.deodhar at gmail.com (Vineet)
Date: Thu, 8 Sep 2011 21:52:26 -0700 (PDT)
Subject: Django or web2py
References: <9cstuhFnm0U1@mid.individual.net>
Message-ID: <72da7d9b-ca04-4597-8670-22a954481e40@b9g2000prd.googlegroups.com>

On Sep 9, 3:29?am, Paul Watson <paul.hermeneu... at gmail.com> wrote:
> I have read some of the talk around these two frameworks.
>
> Would you say that web2py is more geared toward the enterprise?
>
> Which one do you believe will be on Python 3 more quickly?

Both Django & web2py are good frameworks.
I have tried both of them + others & then chosen a hybrid of web2py +
DABO bizobj for my work.
(DABO is a desktop app framework; so I have chosen only the BizObj
layer from it, which can do its job in any other python web or desktop
framework).

Typically, my apps are data-centric business apps.
web2py wins in simplycity yet powerfullness, no install, no
dependencies, good docs & community, low learning curve, etc.

DABO BizObj excels in managing the business logic aspect (including
managing multiple tables insert/update/delete, rollback, before
insert, after save, ... the list is quite long)

http://web2py.com
www.web2pyclices.com
http://thewinecellarbook.com/daboDocTestAlt/dabo.lib.datanav.Bizobj.Bizobj.html
http://dabodev.com/

Also, there are threads in stackoverflow.com which discuss in-depth
the +1 & -1 for these frameworks.
Contributors to these threads include the lead developers including
Massimo himself.

Hope this helps.

---Vineet


From jialiuonlineshoe04 at 163.com  Fri Sep  9 01:29:03 2011
From: jialiuonlineshoe04 at 163.com (amy)
Date: Thu, 8 Sep 2011 22:29:03 -0700 (PDT)
Subject: wholesale all brand(UGGBOOTS, SHOES, CLOTHES, HANDBAG, WATCH, JEANS,
	JERSEY, T-SHIRT, SHIRTS, HOODY, EYEGLASS, CAP, SHAWL, WALLT)
	and so on.
Message-ID: <111713be-0e9f-404f-ac46-1b7747c90f94@f31g2000prj.googlegroups.com>

wholesale all brand shoes(NIKE,ADIDAS,LV,GUCCI,CHANEL,PRADA,POLO,UGG
BOOTS,D&G,DIOR )and so on.
paypal payment wholesale all brand clothing(T-
SHIRT,JEANS,JERSEY,HOODIES,JACKETS,HARDY,SWEATER,SHIRTS )and so on .
http://www.24hour-buy.com/
paypal payment all brand
watch(ROLEX,OMEGA,CHANEL,LV,CARTIER,IWC,GUCCI,RADO )and so on.
paypal payment all brand
handbag(LV,GUCCI,CHANEL,PRADA,POLO,COACH,FENDI,CHLOE,BUBERRY,JUICY)
and so on.
paypal payment brand CAP,SHAWL,BELT,WALLET,UNDER WEAR)and so on.

More detail land,address:  http://www.24hour-buy.com/


From wildeskraut at googlemail.com  Fri Sep  9 01:47:34 2011
From: wildeskraut at googlemail.com (Oliver)
Date: Thu, 8 Sep 2011 22:47:34 -0700 (PDT)
Subject: TypeError: object.__init__() takes no parameters
Message-ID: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>

Hello together,

let me be honest with you, I am a poor programmer who can only do
Perl.
I tried to code a program in Perl, but found that another guy already
finished this job in Python.
Unlucky for me, this guy is now CEO of a company, not really
interested in supporting his old code.

If I want to run shapes.py I receive this error message:

=== error message ===

C:\Documents and Settings\mhg\Desktop\palcalc>shapes.py
EE...
======================================================================
ERROR: test_fits (__main__.containerTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
265, in test_fits
    cont = Container()
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
90, in __init__
    super(Container, self).__init__(xsize, ysize)
TypeError: object.__init__() takes no parameters

======================================================================
ERROR: test_place_bin (__main__.containerTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
257, in test_place_bin
    cont = Container()
  File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
90, in __init__
    super(Container, self).__init__(xsize, ysize)
TypeError: object.__init__() takes no parameters

----------------------------------------------------------------------
Ran 5 tests in 0.032s

FAILED (errors=2)

=== end of error message ===

Snippets of source code:

Line 264 - 268

def test_fits(self):
        cont = Container()
        cont.place_bin(0, 0, 210, 280)
        self.assertEqual(False, cont.fits(Rectangle(0, 210, 280,
420)))
        self.assertEqual(True, cont.fits(Rectangle(0, 280, 280, 490)))

Line 87 - 93

class Container(object):
    """Container to store  a number of non-overlapping rectangles."""
    def __init__(self, xsize=1200, ysize=800):
        super(Container, self).__init__(xsize, ysize)
        self.rect = Rectangle(0, 0, xsize, ysize)
        self.boxes = []
        self.last_placement_strategy = 0

Line 254 - 262

class containerTests(unittest.TestCase):
    """Tests for container objects."""
    def test_place_bin(self):
        cont = Container()
        cont.place_bin(0, 0, 40, 40)
        self.failUnlessRaises(RuntimeError, cont.place_bin, 0, 0, 40,
40)
        cont = Container()
        cont.place_bin(0, 0, 210, 280)
        self.failUnlessRaises(RuntimeError, cont.place_bin, 0, 210,
280, 420)

I think this is the main function:

if __name__ == '__main__':
    unittest.main()

I do not know if I posted what you need to help me, it just would ease
my life a lot. If you need more information please let me know - if
you want you can even be unfriendly to me :)


From tjreedy at udel.edu  Fri Sep  9 02:04:15 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 09 Sep 2011 02:04:15 -0400
Subject: Python: Deleting specific words from a file.
In-Reply-To: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
Message-ID: <j4caan$bra$1@dough.gmane.org>

On 9/8/2011 9:09 PM, papu wrote:
> Hello, I have a data file (un-structed messy file) from which I have
> to scrub specific list of words (delete words).
>
> Here is what I am doing but with no result:
>
> infile = "messy_data_file.txt"
> outfile = "cleaned_file.txt"
>
> delete_list = ["word_1","word_2"....,"word_n"]
> new_file = []
> fin=open(infile,"")
> fout = open(outfile,"w+")
> for line in fin:
>      for word in delete_list:
>          line.replace(word, "")
>      fout.write(line)
> fin.close()
> fout.close()

If you have very many words (and you will need all possible forms of 
each word if you do exact matches), The following (untested and 
incomplete) should run faster.

delete_set = {"word_1","word_2"....,"word_n"}
...
for line in fin:
     for word in line.split()
         if word not in delete_set:
             fout.write(word) # also write space and nl.


Depending on what your file is like, you might be better with 
re.split('(\W+)', line). An example from the manual:
 >>> re.split('(\W+)', '...words, words...')
['', '...', 'words', ', ', 'words', '...', '']

so all non-word separator sequences are preserved and written back out 
(as they will not match delete set).

-- 
Terry Jan Reedy



From mimohammedimran41 at gmail.com  Fri Sep  9 02:20:06 2011
From: mimohammedimran41 at gmail.com (mohammed imran)
Date: Thu, 8 Sep 2011 23:20:06 -0700 (PDT)
Subject: reshma
Message-ID: <fe310c0a-f17f-40f5-8628-446593906db3@e20g2000prn.googlegroups.com>

http://123maza.com/65/fun564/


From ben+python at benfinney.id.au  Fri Sep  9 02:44:37 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 09 Sep 2011 16:44:37 +1000
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
Message-ID: <87sjo6mcyy.fsf@benfinney.id.au>

Oliver <wildeskraut at googlemail.com> writes:

> let me be honest with you, I am a poor programmer who can only do
> Perl.

I strongly suspect you could do more than that.

Welcome to the Python discussion forum.

> I tried to code a program in Perl, but found that another guy already
> finished this job in Python. Unlucky for me, this guy is now CEO of a
> company, not really interested in supporting his old code.

Then he can hardly complain if someone else re-writes it in their
language of choice, can he? :-)

> C:\Documents and Settings\mhg\Desktop\palcalc>shapes.py
> EE...

This, and the rest of your output, is from the call to ?unittest.main?,
Python's standard-library module for unit testing.

>   File "C:\Documents and Settings\mhg\Desktop\palcalc\shapes.py", line
> 90, in __init__
>     super(Container, self).__init__(xsize, ysize)
> TypeError: object.__init__() takes no parameters

The ?super(Container, self)? call asks for a ?super? object representing
the (next) superclass of the type of ?self?.

In this case, as the error message indicates, the next superclass type
is ?object? ? the base type of all objects. Also as the error message
indicates, the initialiser for ?object? doesn't accept the parameters
being passed.

> class Container(object):
>     """Container to store  a number of non-overlapping rectangles."""
>     def __init__(self, xsize=1200, ysize=800):
>         super(Container, self).__init__(xsize, ysize)
>         self.rect = Rectangle(0, 0, xsize, ysize)
>         self.boxes = []
>         self.last_placement_strategy = 0

So, there's no sense in calling the superclass's ?__init__? method with
parameters which won't be accepted because of the function signature.


The next thing to do is to ask about the design of these classes (what
is the intention of this initialiser?). But you say you're entirely new
to it, and that the designer has no interest in it. What are your
options for getting their interest and participating in this thread?

-- 
 \     ?I cannot conceive that anybody will require multiplications at |
  `\   the rate of 40,000 or even 4,000 per hour ?? ?F. H. Wales, 1936 |
_o__)                                                                  |
Ben Finney


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Fri Sep  9 02:57:31 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Fri, 09 Sep 2011 08:57:31 +0200
Subject: TypeError: object.__init__() takes no parameters
In-Reply-To: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
Message-ID: <j4cdda$f61$1@r03.glglgl.eu>

Am 09.09.2011 07:47 schrieb Oliver:
> class Container(object):
>      """Container to store  a number of non-overlapping rectangles."""
>      def __init__(self, xsize=1200, ysize=800):
>          super(Container, self).__init__(xsize, ysize)

And this is the nonsense: Container derives from object and tries to 
call its superclass's constructor with 2 parameters - which won't work.

Write this as super(Container, self).__init__().

HTH,

Thomas


From nmarais at ska.ac.za  Fri Sep  9 03:00:21 2011
From: nmarais at ska.ac.za (Neilen Marais)
Date: Fri, 9 Sep 2011 00:00:21 -0700 (PDT)
Subject: Unittesting SocketServer.StreamRequestHandler subclasses
Message-ID: <a1b69a64-439f-4d7c-8df1-d60a7ab481d9@u26g2000yqu.googlegroups.com>

Hi,

Is there a recommended way for writing unittests of
SocketServer.StreamRequestHandler subclasses? I've tried making a
server stub class and a connection stub class with a recv() method
that immediately raises socket.error(errno.ECONNRESET, ).

This works OK, but it means that whatever unittests I run always
happens after the handler's handle() method has already been called.
Is there a way to avoid this?

Thanks
Neilen


From vineet.deodhar at gmail.com  Fri Sep  9 03:47:37 2011
From: vineet.deodhar at gmail.com (Vineet)
Date: Fri, 9 Sep 2011 00:47:37 -0700 (PDT)
Subject: Django or web2py
References: <9cstuhFnm0U1@mid.individual.net>
Message-ID: <203ea707-5a86-436e-816b-9f91d5971d82@y8g2000prd.googlegroups.com>

On Sep 9, 3:29?am, Paul Watson <paul.hermeneu... at gmail.com> wrote:
> I have read some of the talk around these two frameworks.
>
> Would you say that web2py is more geared toward the enterprise?
>
> Which one do you believe will be on Python 3 more quickly?

Both Django & web2py are good frameworks.
I have tried both of them + others & then chosen a hybrid of web2py +
DABO bizobj for my work.
(DABO is a desktop app framework; so I have chosen only the BizObj
layer from it, which can do its job in any other python web or desktop
framework).

Typically, my apps are data-centric business apps.
web2py wins in simplicity, flexibility, no install, no dependencies,
good docs & community, low learning curve, etc.

DABO BizObj excels in managing the business logic aspect.
With DABO bizobj layer, apart from the business logic, managing
multiple tables insert/update/delete, rollback, before-insert, after-
save, etc. is very handy... the list is quite long)
(I know you will say that every framework has got its own DAL. It's
true. But most of them are designed for basic database functions.)

Some useful links---
http://web2py.com
www.web2pyclices.com
http://thewinecellarbook.com/daboDocTestAlt/dabo.lib.datanav.Bizobj.B...
http://dabodev.com/

Also, there are threads in stackoverflow.com which discuss in-depth
the +1 & -1 for these frameworks.
Contributors to these threads include the lead developers including
Massimo himself.

Hope this helps.

---Vineet


From steve+comp.lang.python at pearwood.info  Fri Sep  9 04:33:48 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 18:33:48 +1000
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
Message-ID: <4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>

Thomas Rachel wrote:

> Am 09.09.2011 07:47 schrieb Oliver:
>> class Container(object):
>> """Container to store ?a number of non-overlapping rectangles."""
>> def __init__(self, xsize=1200, ysize=800):
>> super(Container, self).__init__(xsize, ysize)
> 
> And this is the nonsense: Container derives from object and tries to
> call its superclass's constructor with 2 parameters - which won't work.

Not nonsense. Merely a backward-incompatible change:


[steve at sylar ~]$ python2.2
Python 2.2.3 (#1, Aug 12 2010, 01:08:27)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> object("two", "parameters")
<object object at 0x92a43e8>


In Python 2.2, the default object constructor accepts, and ignores, any
parameters. In Python 2.3 on up, that becomes an error.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Fri Sep  9 05:07:24 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 19:07:24 +1000
Subject: killing a script
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
	<mailman.887.1315526624.27778.python-list@python.org>
Message-ID: <4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>

Cameron Simpson wrote:

> On 30Aug2011 14:13, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
> | On Tue, 30 Aug 2011 08:53 am Arnaud Delobelle wrote:
> | >> Yes, but if I am not mistaken, that will require me to put a line or
> | >> two after each os.system call. That's almost like whack-a-mole at the
> | >> code level rather than the Control-C level. OK, not a huge deal for
> | >> one script, but I was hoping for something simpler. I was hoping I
> | >> could put one line at the top of the script and be done with it.
> | > 
> | > Write a function!  That's what they're for after all :)
> | 
> | I'm not sure that this is actually as simple as that, especially using
> | os.system.
> | 
> | As I understand it, the scenario is this:
> | 
> | The main script looks something like this:
> | 
> | for x in whatever:
> |     os.system('something.py x')
> | 
> | Each time through the loop, a new Python process is started. Each
> | process runs in the foreground, capturing standard input, and so hitting
> | Ctrl-C kills *that* process, not the main script. Unless, by chance, the
> | Ctrl-C happens after the system call returns, but before the next one
> | starts, it is completely invisible to the parent process (the main
> | script). Wrapping os.system in a function does nothing to fix that.
> 
> Presuming you're talking about UNIX, this is not correct.
> 
> Ctrl-C at the terminal delivers SIGINT to _every_ process in the
> controlling process group for the terminal. It also has _nothing_ to do
> with the standard input.

There may be something to what you say, but the behaviour experienced by the
Original Poster still needs explaining. See below.

> When you run a script, yea even a Python script, thus:
> 
>   myscript ...
> 
> then job control capable shells (all of them, these days) put the python
> process running "myscript" in its own process group as the leader
> (being, initially, the only process in the group). If myscript forks
> other processes, as happens in os.system(), they are _also_ in that
> process group. _ALL_ of them receive the SIGINT from your Ctrl-C.


I can replicate to OP's problem with these two simple Python scripts:

[steve at sylar ~]$ cat script.py
#!/usr/bin/python
print "inside script.py"
print "type Ctrl-C to exit"
while True:
    pass

[steve at sylar ~]$ cat test.py
import os
print "calling script.py with os.system"
for i in range(3):
    os.system('./script.py')


And now run them:

[steve at sylar ~]$ python test.py
calling script.py with os.system
inside script.py
type Ctrl-C to exit
Traceback (most recent call last):
  File "./script.py", line 4, in <module>
    while True:
KeyboardInterrupt
inside script.py
type Ctrl-C to exit
Traceback (most recent call last):
  File "./script.py", line 5, in <module>
    pass
KeyboardInterrupt
inside script.py
type Ctrl-C to exit
Traceback (most recent call last):
  File "./script.py", line 4, in <module>
    while True:
KeyboardInterrupt


Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
script.py. While script.py is running, it receives the Ctrl-C, the calling
process does not.



-- 
Steven



From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Fri Sep  9 05:11:06 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Fri, 09 Sep 2011 11:11:06 +0200
Subject: TypeError: object.__init__() takes no parameters
In-Reply-To: <4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
	<4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4cl7r$k72$1@r03.glglgl.eu>

Am 09.09.2011 10:33 schrieb Steven D'Aprano:

> Not nonsense. Merely a backward-incompatible change:

[1]


> In Python 2.2, the default object constructor accepts, and ignores, any
> parameters. In Python 2.3 on up, that becomes an error.

Thanks, I wasn't aware of that. My first contact with Python was with 2.3...

Thomas

[1] Another example why backward-incompatible change are bad. Why was it 
necessary in this case? :-(


From vineet.deodhar at gmail.com  Fri Sep  9 05:39:31 2011
From: vineet.deodhar at gmail.com (Vineet)
Date: Fri, 9 Sep 2011 02:39:31 -0700 (PDT)
Subject: Django or web2py
References: <9cstuhFnm0U1@mid.individual.net>
	<203ea707-5a86-436e-816b-9f91d5971d82@y8g2000prd.googlegroups.com>
Message-ID: <be8e001d-46c8-4454-b11c-c3fe932dd8e2@v16g2000prb.googlegroups.com>

On Sep 9, 12:47?pm, Vineet <vineet.deod... at gmail.com> wrote:
> On Sep 9, 3:29?am, Paul Watson <paul.hermeneu... at gmail.com> wrote:
>
> > I have read some of the talk around these two frameworks.
>
> > Would you say that web2py is more geared toward the enterprise?
>
> > Which one do you believe will be on Python 3 more quickly?
>
> Both Django & web2py are good frameworks.
> I have tried both of them + others & then chosen a hybrid of web2py +
> DABO bizobj for my work.
> (DABO is a desktop app framework; so I have chosen only the BizObj
> layer from it, which can do its job in any other python web or desktop
> framework).
>
> Typically, my apps are data-centric business apps.
> web2py wins in simplicity, flexibility, no install, no dependencies,
> good docs & community, low learning curve, etc.
>
> DABO BizObj excels in managing the business logic aspect.
> With DABO bizobj layer, apart from the business logic, managing
> multiple tables insert/update/delete, rollback, before-insert, after-
> save, etc. is very handy... the list is quite long)
> (I know you will say that every framework has got its own DAL. It's
> true. But most of them are designed for basic database functions.)
>
> Some useful links---http://web2py.comwww.web2pyclices.comhttp://thewinecellarbook.com/daboDocTestAlt/dabo.lib.datanav.Bizobj.B...http://dabodev.com/
>
> Also, there are threads in stackoverflow.com which discuss in-depth
> the +1 & -1 for these frameworks.
> Contributors to these threads include the lead developers including
> Massimo himself.
>
> Hope this helps.
>
> ---Vineet

Re. your point about porting from py2 to py3, the following thread
makes it clear.
http://groups.google.com/group/web2py/browse_thread/thread/5fcd0e97452e9ab8/d38f99b959778cfb?lnk=gst&q=python+3#d38f99b959778cfb

---Vineet


From gandalf at shopzeus.com  Fri Sep  9 05:39:52 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 09 Sep 2011 11:39:52 +0200
Subject: Portable locale usage
In-Reply-To: <1468943535.28842.1315496382655.JavaMail.root@mail.zemris.fer.hr>
References: <1468943535.28842.1315496382655.JavaMail.root@mail.zemris.fer.hr>
Message-ID: <4E69DEE8.9050803@shopzeus.com>


>>>> Why are you trying to force a specific locale to your program
>>>> anyway?
>>> Because I wish to be able to correctly sort Croatian names.
>> Well, all right. If you want to sort Croatian names from a program that
>> runs on an English (or whatever) system, then you will have to check the
>> platform and use a locale that is supported by the platform. (But again,
>> this is not Python's limitation. Python doesn't know what encodings are
>> supported, in advance, and you cannot use a locale that is not supported...)
> I fully agree.
>
> I commented that, if a proper locale is installed,
> the following should work on any system:
>
> locale.setlocale(locale.LC_ALL, ('hr', locale.getpreferredencoding()))
>
> Currently the above does not work on Windows,
> and that is because the locale_alias for 'hr'
> is bound to 'hr_HR.ISO8859-2'.
> Check the source: .../Python-3.2.2/Lib/locale.py, line 537
>
> I was arguing that, on a Windows system,
> the locale_alias for 'hr' should be bound
> to 'Croatian_Croatia.1250'.

Looks like you have found a bug! :-) Why don't you post a bug report?

   L



From duncan.booth at invalid.invalid  Fri Sep  9 05:49:33 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 9 Sep 2011 09:49:33 GMT
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
Message-ID: <Xns9F5B6D522BDAFduncanbooth@127.0.0.1>

Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915
@spamschutz.glglgl.de> wrote:

> Am 09.09.2011 07:47 schrieb Oliver:
>> class Container(object):
>>      """Container to store  a number of non-overlapping rectangles."""
>>      def __init__(self, xsize=1200, ysize=800):
>>          super(Container, self).__init__(xsize, ysize)
> 
> And this is the nonsense: Container derives from object and tries to 
> call its superclass's constructor with 2 parameters - which won't work.
> 
> Write this as super(Container, self).__init__().
> 
It isn't nonsense, just poor and outdated practice. You might subclass 
Container with something that puts another base class into the mro between 
Container and object and in that case calling super(Container, self).
__init__() would be wrong.

object.__init__() used to accept and silently ignore any parameters. This 
meant you could safely pass any constructor parameters along in case there 
was an intervening base class that wanted them. However that was changed 
(presumably after this code was written) and now you have to be a bit more 
careful with your initialisation parameters.

This would be better in general, though if there is actually any code 
depending on xsize,ysize being passed up to a base class it will still need 
changing at the call site:

    def __init__(self, xsize=1200, ysize=800, *args, **kw):
          super(Container, self).__init__(*args, **kw)

That way any xsize and ysize arguments are removed but any additional 
arguments for other base classes are passed through.

-- 
Duncan Booth http://kupuguy.blogspot.com


From hansmu at xs4all.nl  Fri Sep  9 06:13:45 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Fri, 09 Sep 2011 12:13:45 +0200
Subject: killing a script
In-Reply-To: <4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
	<mailman.887.1315526624.27778.python-list@python.org>
	<4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e69e6da$0$2551$e4fe514c@news2.news.xs4all.nl>

On 9/09/11 11:07:24, Steven D'Aprano wrote:
> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
> script.py. While script.py is running, it receives the Ctrl-C, the calling
> process does not.

You misinterpret what you are seeing: the calling process *does* receive
the ctrl-C, it just chooses to ignore it.

This is documented behaviour of os.system.  It you don't want this, then
use the subprocess module, which does not behave this way.

-- HansM



From duncan.booth at invalid.invalid  Fri Sep  9 06:29:47 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 9 Sep 2011 10:29:47 GMT
Subject: Create an index from a webpage [RANT, DNFTT]
References: <op.v1imgsvpa8ncjz@gnudebst>
	<mailman.891.1315534207.27778.python-list@python.org>
Message-ID: <Xns9F5B73D529CD0duncanbooth@127.0.0.1>

Simon Cropper <simoncropper at fossworkflowguides.com> wrote:

> Certainly doable but 
> considering the shear commonality of this task I don't understand why a 
> simple script does not already exist - hence my original request for 
> assistance.

I think you may have underestimated the complexity of the task in general.

To do it for a remote website you need to specify what you consider to be a 
unique page. Here are some questions:

Is case significant for URLs (technically it always is, but IIS sites tend 
to ignore it and to contain links with random permutations of case)?

Are there any query parameters that make two pages distinct? Or any 
parameters that you should ignore? Is the order of parameters significant? 
I recently came across a site that not only had multiple links to identical 
pages with the query parameters in different order but also used a non-
standard % to separate parameters instead of &: it's not so easy getting 
crawlers to handle that mess.

Even after ignoring query parameters are there a finite number of pages to 
the site?
For example, Apache has a spelling correction module that can effectively 
allow any number of spurious subfolders: I've seen a site where 
"/folder1/index.html" had a link to "folder2/index.html" and 
"/folder2/index.html" linked to "folder1/index.html". Apache helpfully 
accepted /folder2/folder1/ as equivalent to /folder1/ and therefore by 
extension also accepted /folder2/folder1/folder2/folder1/...
Zope is also good at creating infinite folder structures.

If you want to spider a remote site then there are plenty of off the shelf 
spidering packages, e.g. httrack. They have a lot of configuration options 
to try to handle the above gotchas.

Your case is probably a lot simpler, but that's just a few reasons why it 
isn't actually a trivial task. Building a list by scanning a bunch of 
folders with html files is comparatively easy which is why that is almost 
always the preferred solution if possible.

-- 
Duncan Booth http://kupuguy.blogspot.com


From __peter__ at web.de  Fri Sep  9 07:04:57 2011
From: __peter__ at web.de (Peter Otten)
Date: Fri, 09 Sep 2011 13:04:57 +0200
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
Message-ID: <j4crsg$5jf$1@solani.org>

Cameron Simpson wrote:

> About the only time I do this is my personal "the()" convenience
> function:
> 
>   def the(list, context=None):
>     ''' Returns the first element of an iterable, but requires there to be
>         exactly one.
>     '''
>     icontext="expected exactly one value"
>     if context is not None:
>       icontext=icontext+" for "+context
> 
>     first=True
>     for elem in list:
>       if first:
>         it=elem
>         first=False
>       else:
>         raise IndexError, "%s: got more than one element (%s, %s, ...)" \
>                           % (icontext, it, elem)
> 
>     if first:
>       raise IndexError, "%s: got no elements" % icontext
>       
>     return it
> 
> Which I use as a definite article in places where an iterable should
> yield exactly one result (eg SQL SELECTs that ought to get exactly
> one hit). I can see I wrote that a long time ago - it could do with some
> style fixes. And a code scan shows it sees little use:-)

A lightweight alternative to that is unpacking:

>>> [x] = ""
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: need more than 0 values to unpack
>>> [x] = "a"
>>> [x] = "ab"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: too many values to unpack



From rosuav at gmail.com  Fri Sep  9 07:30:03 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 9 Sep 2011 21:30:03 +1000
Subject: Best way to check that you are at the beginning (the end) of an
	iterable?
In-Reply-To: <j4crsg$5jf$1@solani.org>
References: <264a83d7-aa43-4e36-b39e-3e67488279b6@glegroupsg2000goo.googlegroups.com>
	<mailman.849.1315435715.27778.python-list@python.org>
	<j4crsg$5jf$1@solani.org>
Message-ID: <CAPTjJmrU2gxqkbdd-73-gr4crz0MmTwR6FxxP+7FkRUT1CUtjQ@mail.gmail.com>

On Fri, Sep 9, 2011 at 9:04 PM, Peter Otten <__peter__ at web.de> wrote:
>>>> [x] = ""
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ValueError: need more than 0 values to unpack
>>>> [x] = "a"
>>>> [x] = "ab"
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ValueError: too many values to unpack
>

Hey look, it's a new operator - the "assign-sole-result-of-iterable" operator!

x ,= "a"

:)

ChrisA


From esthar777 at gmail.com  Fri Sep  9 07:51:04 2011
From: esthar777 at gmail.com (ESTHU ESHU)
Date: Fri, 9 Sep 2011 04:51:04 -0700 (PDT)
Subject: plz see this
Message-ID: <3285b468-2ddf-4c65-9a1e-357da713b0d6@y8g2000prd.googlegroups.com>

http://123maza.com/65/clock747/


From kandrjoshi at gmail.com  Fri Sep  9 08:07:03 2011
From: kandrjoshi at gmail.com (kaustubh joshi)
Date: Fri, 9 Sep 2011 14:07:03 +0200
Subject: what's the command for (cd ..) in python
Message-ID: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>

Hello friends,
                         How do we carry out the command "*cd ..*" in
python?

My problem is :
I have a set of folders say m=1,2,3,4. In each of these folders, I have
subfolders with common name say m_5,m_6,m_7,m_8. In each of these subfolder,
there is a file which I have edit.
                                          1
         2                                    3
       4
                                         |
          |                                      |
            |

------------------------------------------------------------------------------------------------------------------------------------------
                                  1_5, 1_6, 1_7, 1_8               2_5 ,2_6,
2_7, 2_8           3_5, 3_6, 3_7, 3_8          4_5, 4_6, 4_7, 4_8

That is how I designed it

When I run my script, it follows the route 1 ---> 1_5-----> do the edit job
in the file. Now it need to change the  subfolder from 1_5 to 1_6, which is
not happening.

I created the folders using variable like m for folder taking values 1,2,3,4
and m_n for subfolders with n=5,6,7,8.

I am trying with os.chdir(path), but stuck with how to use m_n in it.

What I am missing at the moment is something that do the job "cd .." does.

Any help


Karan
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From steve+comp.lang.python at pearwood.info  Fri Sep  9 08:16:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 22:16:00 +1000
Subject: killing a script
References: <4e5c6376$0$29983$c3e8da3$5496439d@news.astraweb.com>
	<mailman.887.1315526624.27778.python-list@python.org>
	<4e69d74d$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<4e69e6da$0$2551$e4fe514c@news2.news.xs4all.nl>
Message-ID: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>

Hans Mulder wrote:

> On 9/09/11 11:07:24, Steven D'Aprano wrote:
>> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
>> script.py. While script.py is running, it receives the Ctrl-C, the
>> calling process does not.
> 
> You misinterpret what you are seeing: the calling process *does* receive
> the ctrl-C, it just chooses to ignore it. 
>
> This is documented behaviour of os.system. 

Documented where? Neither the on-line documentation nor the function
docstring mentions anything about it that I can see:

http://docs.python.org/py3k/library/os.html#os.system

>>> help(os.system)
Help on built-in function system in module posix:

system(...)
    system(command) -> exit_status

    Execute the command (a string) in a subshell.




-- 
Steven



From vlastimil.brom at gmail.com  Fri Sep  9 08:34:59 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 9 Sep 2011 14:34:59 +0200
Subject: what's the command for (cd ..) in python
In-Reply-To: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
References: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
Message-ID: <CAHzaPEOvp_Ly8Gu9-VPfCQ51VLrZDQXTTHO3B=PUt3mORAtPsQ@mail.gmail.com>

2011/9/9 kaustubh joshi <kandrjoshi at gmail.com>:
> Hello friends,
> ???????????????????????? How do we carry out the command "cd .." in python?
>
> My problem is :
> I have a set of folders say m=1,2,3,4. In each of these folders, I have
> subfolders with common name say m_5,m_6,m_7,m_8. In each of these subfolder,
> there is a file which I have edit.
> ????????????????????????????????????????? 1
> ? ? ? ?? 2?????????? ? ? ? ? ? ? ? ? ? ? ? ?? 3
> ? ? ?? 4
> ???????????????????????????????????????? |
> ? ? ? ? ? |????????????? ? ? ? ? ? ? ? ? ? ? ? ? |
> ? ? ? ? ??? |
>
> ------------------------------------------------------------------------------------------------------------------------------------------
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1_5, 1_6, 1_7, 1_8?????????????? 2_5 ,2_6,
> 2_7, 2_8?????????? 3_5, 3_6, 3_7, 3_8????????? 4_5, 4_6, 4_7, 4_8
>
> That is how I designed it
>
> When I run my script, it follows the route 1 ---> 1_5-----> do the edit job
> in the file. Now it need to change the? subfolder from 1_5 to 1_6, which is
> not happening.
>
> I created the folders using variable like m for folder taking values 1,2,3,4
> and m_n for subfolders with n=5,6,7,8.
>
> I am trying with os.chdir(path), but stuck with how to use m_n in it.
>
> What I am missing at the moment is something that do the job "cd .." does.
>
> Any help
>
>
> Karan
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
Hi,
Would maybe adjusting the path like this work?

>>> my_path = "c://d/e/f/g/"
>>> os.path.abspath(my_path + os.pardir)
'c:\\d\\e\\f'
>>>

hth,
  vbr


From steve+comp.lang.python at pearwood.info  Fri Sep  9 09:03:10 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 23:03:10 +1000
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
Message-ID: <4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>

kaustubh joshi wrote:

> Hello friends,
>                          How do we carry out the command "*cd ..*" in
> python?

import os
os.chdir('..')

But think carefully before doing this. Some functions may be confused if you
change directories while they are running. You may be better off staying in
the same directory, and adjusting the path names to the files as you work
with them.



-- 
Steven



From roy at panix.com  Fri Sep  9 09:19:07 2011
From: roy at panix.com (Roy Smith)
Date: Fri, 09 Sep 2011 09:19:07 -0400
Subject: Processing a file using multithreads
References: <mailman.885.1315522214.27778.python-list@python.org>
	<c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>
Message-ID: <roy-77E2CD.09190709092011@news.panix.com>

In article 
<c6cbd486-7e5e-4d26-93b9-088d48a25dea at g9g2000yqb.googlegroups.com>,
 aspineux <aspineux at gmail.com> wrote:

> On Sep 9, 12:49?am, Abhishek Pratap <abhishek.... at gmail.com> wrote:
> > 1. My input file is 10 GB.
> > 2. I want to open 10 file handles each handling 1 GB of the file
> > 3. Each file handle is processed in by an individual thread using the
> > same function ( so total 10 cores are assumed to be available on the
> > machine)
> > 4. There will be 10 different output files
> > 5. once the 10 jobs are complete a reduce kind of function will
> > combine the output.
> >
> > Could you give some ideas ?
> 
> You can use "multiprocessing" module instead of thread to bypass the
> GIL limitation.

I agree with this.

> First cut your file in 10 "equal" parts. If it is line based search 
> for the first line close to the cut. Be sure to have "start" and 
> "end" for each parts, start is the address of the first character of 
> the first line and end is one line too much (== start of the next 
> block)

How much of the total time will be I/O and how much actual processing?  
Unless your processing is trivial, the I/O time will be relatively 
small.  In that case, you might do well to just use the unix 
command-line "split" utility to split the file into pieces first, then 
process the pieces in parallel.  Why waste effort getting the 
file-splitting-at-line-boundaries logic correct when somebody has done 
it for you?


From duncan.booth at invalid.invalid  Fri Sep  9 09:20:54 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 9 Sep 2011 13:20:54 GMT
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
	<4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <Xns9F5B906CD9148duncanbooth@127.0.0.1>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> Thomas Rachel wrote:
> 
>> Am 09.09.2011 07:47 schrieb Oliver:
>>> class Container(object):
>>> """Container to store ??a number of non-overlapping rectangles."""
>>> def __init__(self, xsize=1200, ysize=800):
>>> super(Container, self).__init__(xsize, ysize)
>> 
>> And this is the nonsense: Container derives from object and tries to
>> call its superclass's constructor with 2 parameters - which won't work.
> 
> Not nonsense. Merely a backward-incompatible change:
> 
> 
> [steve at sylar ~]$ python2.2
> Python 2.2.3 (#1, Aug 12 2010, 01:08:27)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> object("two", "parameters")
><object object at 0x92a43e8>
> 
> 
> In Python 2.2, the default object constructor accepts, and ignores, any
> parameters. In Python 2.3 on up, that becomes an error.
> 
More recently than that. It only became an error in 2.6:

[dbooth at localhost ~]$ python2.5 -c "object().__init__(42)"
[dbooth at localhost ~]$ python2.6 -c "object().__init__(42)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
TypeError: object.__init__() takes no parameters


-- 
Duncan Booth http://kupuguy.blogspot.com


From steve+comp.lang.python at pearwood.info  Fri Sep  9 09:41:37 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 09 Sep 2011 23:41:37 +1000
Subject: TypeError: object.__init__() takes no parameters
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
	<j4cdda$f61$1@r03.glglgl.eu>
	<4e69cf6d$0$29996$c3e8da3$5496439d@news.astraweb.com>
	<Xns9F5B906CD9148duncanbooth@127.0.0.1>
Message-ID: <4e6a1791$0$29984$c3e8da3$5496439d@news.astraweb.com>

Duncan Booth wrote:

> Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

>> In Python 2.2, the default object constructor accepts, and ignores, any
>> parameters. In Python 2.3 on up, that becomes an error.
>> 
> More recently than that. It only became an error in 2.6:

For __init__, sure, but it was an error for __new__ back in 2.3. Sorry for
not being more clear.



-- 
Steven



From dribnairb at gmail.com  Fri Sep  9 10:29:06 2011
From: dribnairb at gmail.com (Brian)
Date: Fri, 9 Sep 2011 07:29:06 -0700 (PDT)
Subject: Python and Outlook-style rules
Message-ID: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>

I'm about to create a system which will need to allow hundreds of
users to create and maintain their own rules in a similar fashion to
MS Outlook rules. ie.
Each rule consists of one or more user configurable conditions and if/
when the conditions are met then one or more user configurable actions
will be applied.

The conditions will be things like "a specified key in a dictionary is
in a specified list of values" (where the user can choose the key and
the values), or "a specific record is in the specified
database" (where the user chooses the primary key of the record and
the database table to look in).

The actions will be things like "send an email to address" (where the
user chooses the address and the email template to use).

The user will do their configuration in a browser. Also, I need to be
able to continue to add new conditions and actions to the system over
time.

Is there a python module (preferably free/open source) which already
does (some of) this? I can write the back-end logic easily enough
(although I'd rather not re-invent the wheel) but I'd particularly
like to find a widget or similar which will make the front-end look
nice and be cross-browser compatible.



From dreyemi at gmail.com  Fri Sep  9 11:57:38 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Fri, 9 Sep 2011 16:57:38 +0100
Subject: How to structure packages
In-Reply-To: <CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>
Message-ID: <CAPbrmCsR+godv91Huw53Mk8t+R6-Xwr4PGNdWiCjRS+Qp4c9TA@mail.gmail.com>

You might want to have a look at this:
http://www.ccs.neu.edu/home/matthias/htdc.html

On Fri, Sep 9, 2011 at 2:37 AM, Chris Angelico <rosuav at gmail.com> wrote:

> On Fri, Sep 9, 2011 at 10:45 AM, Nobody <nobody at nowhere.com> wrote:
> > The Java compiler also acts as a "make" program. If it doesn't find
> > a .class file for a needed class, it will search for the corresponding
> > .java file and compile that. So to compile a complex program, you only
> > need to compile the top-level file (e.g. HelloWorld.java), and it will
> > compile everything which is required. No Makefile is needed, as the
> > relationship between classes, object files and source files is fixed.
> >
>
> If that's the entire benefit, then I think this is a rather hefty
> price to pay for the elimination of a makefile. Oh wow, I can type
> "javac MyClass.java" and it picks up all the others! If you're
> dividing a project into multiple files already, is it that hard to
> have one more that defines the relationships between the others?
>
> Chris Angelico
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From alec.taylor6 at gmail.com  Fri Sep  9 12:19:48 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 10 Sep 2011 02:19:48 +1000
Subject: Python and Outlook-style rules
In-Reply-To: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>
References: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>
Message-ID: <CAO+9iGcEY-XFmR8hsVYegJ9pg1bcs7d=6z7WP6+DgLRpJQr74w@mail.gmail.com>

Something like this?

http://stackoverflow.com/questions/387606/using-user-input-to-find-information-in-a-mysql-database

On Sat, Sep 10, 2011 at 12:29 AM, Brian <dribnairb at gmail.com> wrote:
> I'm about to create a system which will need to allow hundreds of
> users to create and maintain their own rules in a similar fashion to
> MS Outlook rules. ie.
> Each rule consists of one or more user configurable conditions and if/
> when the conditions are met then one or more user configurable actions
> will be applied.
>
> The conditions will be things like "a specified key in a dictionary is
> in a specified list of values" (where the user can choose the key and
> the values), or "a specific record is in the specified
> database" (where the user chooses the primary key of the record and
> the database table to look in).
>
> The actions will be things like "send an email to address" (where the
> user chooses the address and the email template to use).
>
> The user will do their configuration in a browser. Also, I need to be
> able to continue to add new conditions and actions to the system over
> time.
>
> Is there a python module (preferably free/open source) which already
> does (some of) this? I can write the back-end logic easily enough
> (although I'd rather not re-invent the wheel) but I'd particularly
> like to find a widget or similar which will make the front-end look
> nice and be cross-browser compatible.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From alec.taylor6 at gmail.com  Fri Sep  9 12:38:25 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 10 Sep 2011 02:38:25 +1000
Subject: How to structure packages
In-Reply-To: <CAO+9iGdepoaiz0ycvwkAB4C_LhGSL1OpcvHX1r6zvndoS74CSQ@mail.gmail.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<CAPTjJmpr3jtprzbvPbTuQn7UUgTb3JCYTZcBsiXkYeMDVkWTdw@mail.gmail.com>
	<CAPbrmCsR+godv91Huw53Mk8t+R6-Xwr4PGNdWiCjRS+Qp4c9TA@mail.gmail.com>
	<CAO+9iGdepoaiz0ycvwkAB4C_LhGSL1OpcvHX1r6zvndoS74CSQ@mail.gmail.com>
Message-ID: <CAO+9iGe1CnekpWm0byw5P5Tmmf1gzD0Uew=DJEZ+z8gsZNV0aQ@mail.gmail.com>

Kayode: Are the number of pages in that tutorial planned?

:P

> On Sat, Sep 10, 2011 at 1:57 AM, Kayode Odeyemi <dreyemi at gmail.com> wrote:
>> You might want to have a look at this:
>> http://www.ccs.neu.edu/home/matthias/htdc.html
>>
>> On Fri, Sep 9, 2011 at 2:37 AM, Chris Angelico <rosuav at gmail.com> wrote:
>>>
>>> On Fri, Sep 9, 2011 at 10:45 AM, Nobody <nobody at nowhere.com> wrote:
>>> > The Java compiler also acts as a "make" program. If it doesn't find
>>> > a .class file for a needed class, it will search for the corresponding
>>> > .java file and compile that. So to compile a complex program, you only
>>> > need to compile the top-level file (e.g. HelloWorld.java), and it will
>>> > compile everything which is required. No Makefile is needed, as the
>>> > relationship between classes, object files and source files is fixed.
>>> >
>>>
>>> If that's the entire benefit, then I think this is a rather hefty
>>> price to pay for the elimination of a makefile. Oh wow, I can type
>>> "javac MyClass.java" and it picks up all the others! If you're
>>> dividing a project into multiple files already, is it that hard to
>>> have one more that defines the relationships between the others?
>>>
>>> Chris Angelico
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>
>> --
>> Odeyemi 'Kayode O.
>> http://www.sinati.com. t: @charyorde
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>


From abhishek.vit at gmail.com  Fri Sep  9 13:07:41 2011
From: abhishek.vit at gmail.com (Abhishek Pratap)
Date: Fri, 9 Sep 2011 10:07:41 -0700
Subject: Processing a file using multithreads
In-Reply-To: <roy-77E2CD.09190709092011@news.panix.com>
References: <mailman.885.1315522214.27778.python-list@python.org>
	<c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>
	<roy-77E2CD.09190709092011@news.panix.com>
Message-ID: <CAJbA1KCRKy+0mtnH=psbjiuCqj=9idMy=wi_gHJLrJQ_YC-EYw@mail.gmail.com>

Hi All

@Roy : split in unix sounds good but will it be as efficient as
opening 10 different file handles on a file.  I haven't tried it so
just wondering if you have any experience with it.

Thanks for your input. Also I was not aware of the python's GIL limitation.

My application is not I/O bound as far as I can understand it. Each
line is read and then processed independently of each other. May be
this might sound I/O intensive as #N files will be read but I think if
I have 10 processes running under a parent then it might not be a
bottle neck.

Best,
-Abhi


On Fri, Sep 9, 2011 at 6:19 AM, Roy Smith <roy at panix.com> wrote:
> In article
> <c6cbd486-7e5e-4d26-93b9-088d48a25dea at g9g2000yqb.googlegroups.com>,
> ?aspineux <aspineux at gmail.com> wrote:
>
>> On Sep 9, 12:49?am, Abhishek Pratap <abhishek.... at gmail.com> wrote:
>> > 1. My input file is 10 GB.
>> > 2. I want to open 10 file handles each handling 1 GB of the file
>> > 3. Each file handle is processed in by an individual thread using the
>> > same function ( so total 10 cores are assumed to be available on the
>> > machine)
>> > 4. There will be 10 different output files
>> > 5. once the 10 jobs are complete a reduce kind of function will
>> > combine the output.
>> >
>> > Could you give some ideas ?
>>
>> You can use "multiprocessing" module instead of thread to bypass the
>> GIL limitation.
>
> I agree with this.
>
>> First cut your file in 10 "equal" parts. If it is line based search
>> for the first line close to the cut. Be sure to have "start" and
>> "end" for each parts, start is the address of the first character of
>> the first line and end is one line too much (== start of the next
>> block)
>
> How much of the total time will be I/O and how much actual processing?
> Unless your processing is trivial, the I/O time will be relatively
> small. ?In that case, you might do well to just use the unix
> command-line "split" utility to split the file into pieces first, then
> process the pieces in parallel. ?Why waste effort getting the
> file-splitting-at-line-boundaries logic correct when somebody has done
> it for you?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From tjreedy at udel.edu  Fri Sep  9 13:31:21 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 09 Sep 2011 13:31:21 -0400
Subject: TypeError: object.__init__() takes no parameters
In-Reply-To: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
References: <e4d24c0f-3556-420d-bfed-4b14927d35a4@v16g2000prb.googlegroups.com>
Message-ID: <j4dij1$4ok$1@dough.gmane.org>

On 9/9/2011 1:47 AM, Oliver wrote:

> If I want to run shapes.py I receive this error message:

Others have explained why code that ran once now does not.

> class Container(object):
>      """Container to store  a number of non-overlapping rectangles."""
>      def __init__(self, xsize=1200, ysize=800):
>          super(Container, self).__init__(xsize, ysize)

Remove this line and the error will go away. It *never* did anything.

>          self.rect = Rectangle(0, 0, xsize, ysize)
>          self.boxes = []
>          self.last_placement_strategy = 0

-- 
Terry Jan Reedy



From dreadpiratejeff at gmail.com  Fri Sep  9 13:32:19 2011
From: dreadpiratejeff at gmail.com (J)
Date: Fri, 9 Sep 2011 13:32:19 -0400
Subject: A bit of a boggle about subprocess.poll() and the codes it receives
	from a process
Message-ID: <CAFB6qZuFNbK80QO6=kdzLZY2RV1w=q35wTzQdxZxJN33iYPg-w@mail.gmail.com>

Hi,

I need a bit of help sorting this out...

I have a memory test script that is a bit of compiled C.  The test itself
can only ever return a 0 or 1 exit code, this is explicitly coded and there
are no other options.

I also have a wrapper test script that calls the C program that should also
only return 0 or 1 on completion.

The problem i'm encountering, however, involves the return code when
subprocess.poll() is called against the running memory test process.  The
current code in my wrapper program looks like this:

def run_processes(self, number, command):
        passed = True
        pipe = []
        for i in range(number):
            pipe.append(self._command(command))
            print "Started: process %u pid %u: %s" % (i, pipe[i].pid,
command)
        sys.stdout.flush()
        waiting = True
        while waiting:
            waiting = False
            for i in range(number):
                if pipe[i]:
                    line = pipe[i].communicate()[0]
                    if line and len(line) > 1:
                        print "process %u pid %u: %s" % (i, pipe[i].pid,
line)
                        sys.stdout.flush()
                    if pipe[i].poll() == -1:
                        waiting = True
                    else:
                        return_value = pipe[i].poll()
                        if return_value != 0:
                            print "Error: process  %u pid %u retuned %u" %
(i, pipe[i].pid, return_value)
                            passed = False
                        print "process %u pid %u returned success" % (i,
pipe[i].pid)
                        pipe[i] = None
        sys.stdout.flush()
        return passed

So what happens here is that in the waiting loop, if pipe[i].poll returns a
-1, we keep waiting, and then if it returns anything OTHER than -1, we exit
and return the return code.

BUT, I'm getting, in some cases, a return code of 127, which is impossible
to get from the memory test program.

The output from this bit of code looks like this in a failing situation:
Error: process 0 pid 2187 retuned 127
process 0 pid 2187 returned success
Error: process 1 pid 2188 retuned 127
process 1 pid 2188 returned success

I'm thinking that I'm hitting some sort of race here where the kernel is
reporting -1 while the process is running, then returns 127 or some other
status when the process is being killed and then finally 0 or 1 after the
process has completely closed out.  I "think" that the poll picks up this
intermediate exit status and immediately exits the loop, instead of waiting
for a 0 or 1.

I've got a modified version that I'm getting someone to test for me now that
changes

 if pipe[i].poll() == -1:
     waiting = True

to this

if pipe[i].poll() not in [0,1]:
    waiting = True

So my real question is: am I on the right track here, and am I correct in my
guess that the kernel is reporting different status codes to
subprocess.poll() during the shutdown of the polled process?
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From tjreedy at udel.edu  Fri Sep  9 13:35:37 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 09 Sep 2011 13:35:37 -0400
Subject: what's the command for (cd ..) in python
In-Reply-To: <4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4dir2$6l8$1@dough.gmane.org>

On 9/9/2011 9:03 AM, Steven D'Aprano wrote:
> kaustubh joshi wrote:
>
>> Hello friends,
>>                           How do we carry out the command "*cd ..*" in
>> python?
>
> import os
> os.chdir('..')
>
> But think carefully before doing this. Some functions may be confused if you
> change directories while they are running. You may be better off staying in
> the same directory, and adjusting the path names to the files as you work
> with them.

Or, use it once at the top of the main module, with an absolute path, to 
make sure you start at a known place where you want to start.

-- 
Terry Jan Reedy



From ray at aarden.us  Fri Sep  9 16:04:30 2011
From: ray at aarden.us (ray)
Date: Fri, 9 Sep 2011 13:04:30 -0700 (PDT)
Subject: Installing 2.6 on Win 7
Message-ID: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>

I have not found binaries for this install.  The page
http://www.python.org/download/windows/
takes me to
http://www.python.org/download/releases/
which goes to
http://www.python.org/download/releases/2.6.7/
Here are Gzip and Bzip tar balls.  The readme files describe linux
builds and the content seems to match.

Are there win binaries or source files?

ray


From brian.curtin at gmail.com  Fri Sep  9 16:14:43 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Fri, 9 Sep 2011 15:14:43 -0500
Subject: Installing 2.6 on Win 7
In-Reply-To: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
References: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
Message-ID: <CAD+XWwpaejEhz8fgJXp+4UMGop9DU=Nw1qyzHi5YEac=P5-hpA@mail.gmail.com>

On Fri, Sep 9, 2011 at 15:04, ray <ray at aarden.us> wrote:
>
> I have not found binaries for this install. ?The page
> http://www.python.org/download/windows/
> takes me to
> http://www.python.org/download/releases/
> which goes to
> http://www.python.org/download/releases/2.6.7/
> Here are Gzip and Bzip tar balls. ?The readme files describe linux
> builds and the content seems to match.
>
> Are there win binaries or source files?

As stated at the top of that page...
"""Python 2.6.7?is a security-fix only source release for Python
2.6.6, fixing several reported security issues. Python 2.6.7 was
released on June 3, 2011."""

If you work backwards, http://www.python.org/download/releases/2.6.6/
is the last version binaries were created for.


From benjamin.kaplan at case.edu  Fri Sep  9 16:17:00 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 9 Sep 2011 16:17:00 -0400
Subject: Installing 2.6 on Win 7
In-Reply-To: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
References: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
Message-ID: <CAMuTYXgd-42Yaa__iv9PBPjdoPFyvfqRAU++bKh85J=koKhO6Q@mail.gmail.com>

On Sep 9, 2011 4:07 PM, "ray" <ray at aarden.us> wrote:
>
> I have not found binaries for this install.  The page
> http://www.python.org/download/windows/
> takes me to
> http://www.python.org/download/releases/
> which goes to
> http://www.python.org/download/releases/2.6.7/
> Here are Gzip and Bzip tar balls.  The readme files describe linux
> builds and the content seems to match.
>
> Are there win binaries or source files?
>
> ray
> --

There is no such thing as the windows source vs. the Linux source. Just
different build files, both of which are in those folders. Since 2.6 is in
security-fix only mode, python.org doesn't provide binaries. You may be able
to find binaries from ActiveState if you don't want to build it yourself.
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From tyler at tysdomain.com  Fri Sep  9 17:00:32 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Fri, 09 Sep 2011 15:00:32 -0600
Subject: what's the command for (cd ..) in python
In-Reply-To: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
References: <CAJ02=3jSi2C6qZUbaLmQi70f-XNyuM3ba-Mq1nzSDpXg-ruHQw@mail.gmail.com>
Message-ID: <4E6A7E70.1070807@tysdomain.com>

On 9/9/2011 6:07 AM, kaustubh joshi wrote:
> Hello friends,
>                          How do we carry out the command "*cd ..*" in 
> python?
>
os.chdir, like so:
 >>> os.getcwd()
'/home/tyler'
 >>> os.chdir("../")
 >>> os.getcwd()
'/home'
So you could do something like: os.chdir("../foo")

> My problem is :
> I have a set of folders say m=1,2,3,4. In each of these folders, I 
> have subfolders with common name say m_5,m_6,m_7,m_8. In each of these 
> subfolder, there is a file which I have edit.
>                                           1                            
>                2                                    3                  
>                    4
>                                          |                            
>                 |                                      |              
>                         |
>                                      
> ------------------------------------------------------------------------------------------------------------------------------------------
>                                   1_5, 1_6, 1_7, 1_8               2_5 
> ,2_6, 2_7, 2_8           3_5, 3_6, 3_7, 3_8          4_5, 4_6, 4_7, 4_8
>
> That is how I designed it
>
> When I run my script, it follows the route 1 ---> 1_5-----> do the 
> edit job in the file. Now it need to change the  subfolder from 1_5 to 
> 1_6, which is not happening.
>
> I created the folders using variable like m for folder taking values 
> 1,2,3,4 and m_n for subfolders with n=5,6,7,8.
>
> I am trying with os.chdir(path), but stuck with how to use m_n in it.
>
> What I am missing at the moment is something that do the job "cd .." does.
>
> Any help
>
>
> Karan
>
>
>


-- 

Take care,
Ty
Web: http://tds-solutions.net

Sent from my toaster.

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From tyler at tysdomain.com  Fri Sep  9 17:07:07 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Fri, 09 Sep 2011 15:07:07 -0600
Subject: Installing 2.6 on Win 7
In-Reply-To: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
References: <f1a1fe2a-cec2-43ae-b740-57e56394aea8@eb1g2000vbb.googlegroups.com>
Message-ID: <4E6A7FFB.90309@tysdomain.com>

On 9/9/2011 2:04 PM, ray wrote:
> I have not found binaries for this install.  The page
> http://www.python.org/download/windows/
> takes me to
> http://www.python.org/download/releases/
> which goes to
> http://www.python.org/download/releases/2.6.7/
> Here are Gzip and Bzip tar balls.  The readme files describe linux
> builds and the content seems to match.
>
> Are there win binaries or source files?
>
http://www.python.org/getit/releases/2.6.6/
has a release for windows x86 and x64

> ray


-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From stefan-usenet at bytereef.org  Fri Sep  9 17:41:18 2011
From: stefan-usenet at bytereef.org (Stefan Krah)
Date: Fri, 9 Sep 2011 23:41:18 +0200
Subject: try... except with unknown error types
In-Reply-To: <j3m7fe0284i@news3.newsguy.com>
References: <mailman.230.1313780957.27778.python-list@python.org>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.286.1313956388.27778.python-list@python.org>
	<j3m7fe0284i@news3.newsguy.com>
Message-ID: <20110909214118.GA32405@sleipnir.bytereef.org>

Chris Torek <nospam at torek.net> wrote:
> (I have also never been sure whether something is going to raise
> an IOError or an OSError for various OS-related read or write
> operation failures -- such as exceeding a resource limit, for
> instance -- so most places that do I/O operations on OS files, I
> catch both.  Still, it sure would be nice to have a static analysis
> tool that could answer questions about potential exceptions. :-) )

There is an effort to fix this:

http://www.python.org/dev/peps/pep-3151/


And an implementation ...

http://hg.python.org/features/pep-3151/


... together with a feature request:

http://bugs.python.org/issue12555


I think the whole concept makes a lot of sense and is really worth
taking a look at.


Stefan Krah




From cs at zip.com.au  Fri Sep  9 18:29:02 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 10 Sep 2011 08:29:02 +1000
Subject: killing a script
In-Reply-To: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110909222902.GA25985@cskk.homeip.net>

On 09Sep2011 22:16, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
| Hans Mulder wrote:
| > On 9/09/11 11:07:24, Steven D'Aprano wrote:
| >> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation of
| >> script.py. While script.py is running, it receives the Ctrl-C, the
| >> calling process does not.
| > 
| > You misinterpret what you are seeing: the calling process *does* receive
| > the ctrl-C, it just chooses to ignore it. 
| >
| > This is documented behaviour of os.system. 
| 
| Documented where? Neither the on-line documentation nor the function
| docstring mentions anything about it that I can see:
| 
| http://docs.python.org/py3k/library/os.html#os.system

My copy of the 2.7 docs says:

  This is implemented by calling the Standard C function system(), and
  has the same limitations.

and sure enough, "man 3 system" says:

  The system() function hands the argument command to the command
  interpreter sh(1).  The calling process waits for the shell to finish
  executing the command, ignoring SIGINT and SIGQUIT, and blocking
  SIGCHLD.

os.system() is very convenient for simple stuff, but one size does not
fit all. Continuing with the Python docs for os.system:

  On Unix, the return value is the exit status of the process encoded in
  the format specified for wait().

and it is easy to inspect that value for "the subprocess died from a
signal". Not inspecting the exit status correctly will always be an
opportunity for incorrect app behaviour.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Mac OS X. Because making Unix user-friendly is easier than debugging Windows.
- Mike Dawson, Macintosh Systems Administrator and Consultation.
  mdawson at mac.com http://herowars.onestop.net


From Phillip.M.Feldman at gmail.com  Fri Sep  9 19:45:44 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Fri, 9 Sep 2011 16:45:44 -0700 (PDT)
Subject: can't generate iterator from list
Message-ID: <32435519.post@talk.nabble.com>


It is supposed to be possible to generate a list representation of any
iterator that produces a sequence of finite length, but this doesn't always
work. Here's a case where it does work:

Input:

from itertools import combinations
list(combinations(range(4),2))

Output:

[(0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (2, 3)]

When I define my own classes that produce iterators, conversion to a list
works for some of these classes but not for others. Here's a case where it
doesn't work:

In:  list(balls_in_numbered_boxes(2, [3,3,3]))

Out:

[array([0, 0, 1]),
 array([0, 0, 1]),
 array([0, 0, 1]),
 array([0, 0, 1]),
 array([0, 0, 1])]

Note that if I apply the `next` method to the object, the output is correct:

In [5]: x=balls_in_numbered_boxes(3,[3,3,3])

In [6]: x.next()
Out[6]: array([3, 0, 0])

In [7]: x.next()
Out[7]: array([2, 1, 0])

In [8]: x.next()
Out[8]: array([1, 2, 0])

In [9]: x.next()
Out[9]: array([0, 3, 0])

In [10]: x.next()
Out[10]: array([0, 2, 1])

In [11]: x.next()
Out[11]: array([0, 1, 2])

In [12]: x.next()
Out[12]: array([0, 0, 3])

In [13]: x.next()
---------------------------------------------------------------------------
StopIteration                             Traceback (most recent call last)

Code is attached (see below). Any suggestions as to what's going wrong will
be appreciated.

class balls_in_numbered_boxes(object):
   """
   OVERVIEW

   This class generates an iterator that produces all distinct distributions
of
   indistinguishable balls among numbered boxes with specified capacity
limits.
   (This is a generalization of the most common formulation of the problem,
   where each box is sufficiently large to accommodate all of the balls, and
is
   an important example of a class of combinatorics problems called 'weak
   composition' problems).


   CONSTRUCTOR INPUTS

   n: the number of balls

   limits: This argument is a list of length 1 or greater.  The length of
the
   list corresponds to the number of boxes.  `limits[i]` is a positive
integer
   that specifies the maximum capacity of the ith box.  If `limits[i]`
equals
   `n` (or greater), then the ith box can accommodate all `n` balls and thus
   effectively has unlimited capacity.
   """

   def __init__(self, n=None, limits=None):
      if n < 0 or not isinstance(n,int):
         raise BadInput("The number of balls n must be a non-negative
integer.")

      if not isinstance(limits,list) or len(limits)<1:
         raise BadInput("`limits` must be a non-empty list.")
      for limit in limits:
         if not isinstance(limit,int) or limit<1:
            raise BadInput("Items in `limits` must be positive integers.")

      # Copy constructor inputs to object attributes.  We make a `deepcopy`
of
      # `limits` to protect against the possibility of the calling program
      # modifying it before all calls to the `next` method have been
completed.
      self.n= n
      self.limits= deepcopy(limits)
      self.distribution= None


   def __iter__(self):
      return self


   def next(self):

      # If `self.distribution` is `None`, this is the initial call to
`next`,
      # in which case we generate the initial distribution by assigning as
many
      # balls as possible to the first box, as many balls that remain to the
      # next box, and so on.
      if self.distribution is None:
         self.distribution= zeros(len(self.limits), dtype='i4')

         balls= self.n

         for box in xrange(len(self.limits)):

            # Store as many balls as possible in the current box:
            self.distribution[box]= min(balls,self.limits[box])
            balls-= self.distribution[box]
            if balls == 0: break

         else:

            # We fell through the above loop, which means that it was
impossible
            # to distribute all of the balls:
            raise BadInput("The total capacity of the boxes is less than the
"
              "number of balls to be distributed.")

         # Make first box the "current" box, i.e., the box from which a ball
         # will be moved when the `next` method is invoked:
         self.box= 0

         return self.distribution

      # `self.distribution` is not `None`, which means that this is not the
      # initial invocation of `next`.  We create the next distribution by
moving
      # one ball to the right, unless this is impossible.

      self.distribution[self.box]-= 1

      for box in xrange(self.box+1,len(self.limits)):

         # If this box is full, advance to the next one:
         if self.distribution[box] == self.limits[box]: continue
         self.distribution[box]+= 1
         break

      else:

         # We fell through the above loop, which means that it was
impossible
         # to find a new home for the ball that we were trying to move.
         raise StopIteration

      # If the current box--the box from which we have been removing balls--
is
      # empty, advance to the next box:
      if self.distribution[self.box] == 0: self.box+= 1

      return self.distribution
-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32435519.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From Phillip.M.Feldman at gmail.com  Fri Sep  9 20:00:39 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Fri, 9 Sep 2011 17:00:39 -0700 (PDT)
Subject: can't generate list from iterator
In-Reply-To: <32435519.post@talk.nabble.com>
References: <32435519.post@talk.nabble.com>
Message-ID: <32435569.post@talk.nabble.com>


The title should have been "can't generate list from iterator".
-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32435569.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From miki.tebeka at gmail.com  Fri Sep  9 20:07:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 9 Sep 2011 17:07:54 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <mailman.920.1315612886.27778.python-list@python.org>
References: <mailman.920.1315612886.27778.python-list@python.org>
Message-ID: <1fcf2318-7b76-425b-a100-57d3cd5f8e0f@glegroupsg2000goo.googlegroups.com>

1. Can you post the code somewhere where it's indented properly? (http://paste.pocoo.org/)
2. In the list example you call balls_in_numbered_boxes(2, [3,3,3]) but in the interactive example you call balls_in_numbered_boxes(3,[3,3,3])


From miki.tebeka at gmail.com  Fri Sep  9 20:07:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 9 Sep 2011 17:07:54 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <mailman.920.1315612886.27778.python-list@python.org>
References: <mailman.920.1315612886.27778.python-list@python.org>
Message-ID: <1fcf2318-7b76-425b-a100-57d3cd5f8e0f@glegroupsg2000goo.googlegroups.com>

1. Can you post the code somewhere where it's indented properly? (http://paste.pocoo.org/)
2. In the list example you call balls_in_numbered_boxes(2, [3,3,3]) but in the interactive example you call balls_in_numbered_boxes(3,[3,3,3])


From matthew.a.hess at gmail.com  Fri Sep  9 20:19:38 2011
From: matthew.a.hess at gmail.com (matt)
Date: Fri, 9 Sep 2011 17:19:38 -0700 (PDT)
Subject: IOError 35 when trying to read the result of call to urllib2.urlopen
Message-ID: <ca4e297e-2fd9-4881-b89d-9c0f6ab59009@a10g2000prn.googlegroups.com>

I'm using urllib2's urlopen function to post to a service which should
return a rather lengthy JSON object as the body of its response.
Here's the code:

{{{
ctype, body = encode_multipart(fields, files)
url = 'http://someservice:8080/path/to/resource'
headers = {'Content-Type': ctype, 'Content-Length': str(len(body))}
req = urllib2.Request(url, body, headers)
resp = urllib2.urlopen(req)

resp_body = resp.read()
}}}

When I try to look at "resp_body" I get this error:

IOError: [Errno 35] Resource temporarily unavailable

I posted to the same URI using curl and it worked fine, so I don't
think it has to do with the server.

Any thoughts?


From steve+comp.lang.python at pearwood.info  Fri Sep  9 20:55:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 10:55:53 +1000
Subject: can't generate list from iterator [was: can't generate iterator
	from list]
References: <mailman.920.1315612886.27778.python-list@python.org>
Message-ID: <4e6ab59a$0$30002$c3e8da3$5496439d@news.astraweb.com>

Dr. Phillip M. Feldman wrote:

> 
> It is supposed to be possible to generate a list representation of any
> iterator that produces a sequence of finite length, but this doesn't
> always work. Here's a case where it does work:
> 
> Input:
> 
> from itertools import combinations
> list(combinations(range(4),2))
> 
> Output:
> 
> [(0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (2, 3)]
> 
> When I define my own classes that produce iterators, conversion to a list
> works for some of these classes but not for others. Here's a case where it
> doesn't work:
> 
> In:  list(balls_in_numbered_boxes(2, [3,3,3]))
> 
> Out:
> 
> [array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1])]


But it does work -- it generates a list, exactly as expected.

The problem is not that you can't generate a list. The problem is that the
list you generate is not what you expect.

What you have here is a list containing the same array, repeated three
times. When you print the permutations one at a time, you don't notice, but
by collecting them all at once, you see clearly that they are the same
array object. Try this:

combos = list(balls_in_numbered_boxes(2, [3,3,3]))
[id(a) for a in combos]


I expect you will see something like [123456, 123456, 123456].


The simplest fix is to fix the next() method so that it returns a copy of
self.distribution instead of the array itself.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Fri Sep  9 21:02:08 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 11:02:08 +1000
Subject: IOError 35 when trying to read the result of call to
	urllib2.urlopen
References: <ca4e297e-2fd9-4881-b89d-9c0f6ab59009@a10g2000prn.googlegroups.com>
Message-ID: <4e6ab711$0$29975$c3e8da3$5496439d@news.astraweb.com>

matt wrote:

> When I try to look at "resp_body" I get this error:
> 
> IOError: [Errno 35] Resource temporarily unavailable
> 
> I posted to the same URI using curl and it worked fine, so I don't
> think it has to do with the server.

Are your Python code and curl both using the same proxy? It may be that one
is going direct and the other is using a proxy.

Or perhaps the destination is just flaky, and the resource genuinely is
temporarily unavailable. Or it doesn't like your useragent string and is
lying.


-- 
Steven



From ray at aarden.us  Fri Sep  9 21:21:58 2011
From: ray at aarden.us (ray at aarden.us)
Date: Fri, 09 Sep 2011 18:21:58 -0700
Subject: Installing 2.6 on Win 7
Message-ID: <20110909182158.1753ead7c2b35a7d15c5b99498690bcc.e87438b7a8.wbe@email11.secureserver.net>

An HTML attachment was scrubbed...
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From steve+comp.lang.python at pearwood.info  Fri Sep  9 21:25:40 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 11:25:40 +1000
Subject: killing a script
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
	<mailman.917.1315607348.27778.python-list@python.org>
Message-ID: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>

Cameron Simpson wrote:

> On 09Sep2011 22:16, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
> | Hans Mulder wrote:
> | > On 9/09/11 11:07:24, Steven D'Aprano wrote:
> | >> Sure enough, I now have to hit Ctrl-C repeatedly, once per invocation
> | >> of script.py. While script.py is running, it receives the Ctrl-C, the
> | >> calling process does not.
> | > 
> | > You misinterpret what you are seeing: the calling process *does*
> | > receive the ctrl-C, it just chooses to ignore it.
> | >
> | > This is documented behaviour of os.system.
> | 
> | Documented where? Neither the on-line documentation nor the function
> | docstring mentions anything about it that I can see:
> | 
> | http://docs.python.org/py3k/library/os.html#os.system
> 
> My copy of the 2.7 docs says:
> 
>   This is implemented by calling the Standard C function system(), and
>   has the same limitations.
> 
> and sure enough, "man 3 system" says:

I don't consider having to look up documentation for a function in a
completely different language (in this case, C) as "documented behaviour of
os.system". 

Does the C standard define the behaviour of system(), or is that
implementation dependent? It sounds to me that the Python developers are
implicitly refusing responsibility for the detailed behaviour of os.system
by noting that it depends on the C function. What do Jython, PyPy and
IronPython do?

Perhaps the docs for os.system should explicitly note that the behaviour is
implementation dependent, rather than just hint at it. Either that or
explicitly state what os.system does.


> os.system() is very convenient for simple stuff, but one size does not
> fit all. 

I never said it does. Back in my first comment on this thread, I said

"Possibly using the subprocess module may help."


> Continuing with the Python docs for os.system: 
> 
>   On Unix, the return value is the exit status of the process encoded in
>   the format specified for wait().
> 
> and it is easy to inspect that value for "the subprocess died from a
> signal". Not inspecting the exit status correctly will always be an
> opportunity for incorrect app behaviour.

Except that the subprocess can catch the KeyboardInterrupt before exiting,
and there's no guarantee that it will return an appropriate error code.

You're right though, os.system is good for simple stuff and not much more.


-- 
Steven



From rosuav at gmail.com  Fri Sep  9 21:37:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 10 Sep 2011 11:37:53 +1000
Subject: killing a script
In-Reply-To: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
	<mailman.917.1315607348.27778.python-list@python.org>
	<4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmojXCbmo6Q5ZuxC1urOUybu6xrfxq995A6NpKzwPvuNfQ@mail.gmail.com>

On Sat, Sep 10, 2011 at 11:25 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
>> ? This is implemented by calling the Standard C function system(), and
>> ? has the same limitations.
>>
>> and sure enough, "man 3 system" says:
>
> I don't consider having to look up documentation for a function in a
> completely different language (in this case, C) as "documented behaviour of
> os.system".
>

The Python docs chain to the C docs. It'd be nice to have a link
somewhere, but that's platform-dependent - the online docs could link
to an online man page, but local docs can't, etc. It's fairly normal
for high level languages to expose a lot of C API functions, with all
the concerns and features given. Not a lot of point bloating the
Python docs with every little detail, imho.

ChrisA


From tyler at tysdomain.com  Fri Sep  9 23:54:40 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Fri, 09 Sep 2011 21:54:40 -0600
Subject: using python in web applications
Message-ID: <4E6ADF80.7010607@tysdomain.com>

Hello all:
I'm curious if there are some good solutions for using Python in web 
applications.

I'm not feeling particularly masochistic, so I do not want to develop 
this project in PHP; essentially I'm looking to build a web-based MMO. I 
know that you can use nginx with Python with servers like Flask, but I'm 
not really sure how well all of those work. Since this will be a game, I 
can expect quite a few users; I've already got quite a lot of interest. 
I don't much care for PHP, but the thing that can be said for it is it's 
pretty quick. How does Python compare? Are there some solutions (I was 
told about PyPy today) that would be quicker that I could still use for 
the web app? I'm also curious what databases are suggested? I've always 
done most of my work in MYSql, but from what I understand postgresql is 
becoming more popular to.

Thanks all for the input,

-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From ben+python at benfinney.id.au  Sat Sep 10 00:19:22 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 10 Sep 2011 14:19:22 +1000
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <87mxedm3lh.fsf@benfinney.id.au>

"Littlefield, Tyler" <tyler at tysdomain.com> writes:

> I'm curious if there are some good solutions for using Python in web
> applications.

Start with:

<URL:http://docs.python.org/howto/webservers.html#frameworks>
<URL:http://wiki.python.org/moin/WebFrameworks>

and try your criteria against what you find there.

-- 
 \     ?As scarce as truth is, the supply has always been in excess of |
  `\                                       the demand.? ?Josh Billings |
_o__)                                                                  |
Ben Finney


From timr at probo.com  Sat Sep 10 01:43:19 2011
From: timr at probo.com (Tim Roberts)
Date: Fri, 09 Sep 2011 22:43:19 -0700
Subject: Processing a file using multithreads
References: <mailman.885.1315522214.27778.python-list@python.org>
	<c6cbd486-7e5e-4d26-93b9-088d48a25dea@g9g2000yqb.googlegroups.com>
	<roy-77E2CD.09190709092011@news.panix.com>
	<mailman.908.1315588083.27778.python-list@python.org>
Message-ID: <n4ul67tv8aaktl2mqednke7bbdvmodvncu@4ax.com>

Abhishek Pratap <abhishek.vit at gmail.com> wrote:
>
>My application is not I/O bound as far as I can understand it. Each
>line is read and then processed independently of each other. May be
>this might sound I/O intensive as #N files will be read but I think if
>I have 10 processes running under a parent then it might not be a
>bottle neck.

Your conclusion doesn't follow from your premise.  If you are only doing a
little bit of processing on each line, then you almost certainly WILL be
I/O bound.  You will spend most of your time waiting for the disk to
deliver more data.  In that case, multithreading is not a win.  The threads
will all compete with each other for the disk.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From zak.mc.kraken at libero.it  Sat Sep 10 02:23:51 2011
From: zak.mc.kraken at libero.it (Vito 'ZeD' De Tullio)
Date: Sat, 10 Sep 2011 08:23:51 +0200
Subject: FYI
Message-ID: <j4evpn$9pb$1@dough.gmane.org>


http://scummos.blogspot.com/2011/09/kdev-python-argument-type-guessing.html

I'm not used to big ide/rad for python... but I think this work is 
excellent!

Are there alternatives (pydev? others?) capable of this sort of thinks (I 
mean "guessing the type" and method autocomplete)

-- 
By ZeD



From __peter__ at web.de  Sat Sep 10 03:05:43 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 09:05:43 +0200
Subject: can't generate iterator from list
References: <32435519.post@talk.nabble.com>
Message-ID: <j4f27q$nkd$1@dough.gmane.org>

Dr. Phillip M. Feldman wrote:

> 
> It is supposed to be possible to generate a list representation of any
> iterator that produces a sequence of finite length, but this doesn't
> always work. Here's a case where it does work:
> 
> Input:
> 
> from itertools import combinations
> list(combinations(range(4),2))
> 
> Output:
> 
> [(0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (2, 3)]
> 
> When I define my own classes that produce iterators, conversion to a list
> works for some of these classes but not for others. Here's a case where it
> doesn't work:
> 
> In:  list(balls_in_numbered_boxes(2, [3,3,3]))
> 
> Out:
> 
> [array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1]),
>  array([0, 0, 1])]

[snip code where excessive commenting does more bad than good]

The problem is that you return the same mutable object on every next() call. 
Here's a simplified example:

>>> def g(items):
...     x = [None]
...     for item in items:
...             x[0] = item
...             yield x
...
>>> list(g("abc"))
[['c'], ['c'], ['c']]

When you invoke it using next() you are fooled into thinking that it works 
as desired:

>>> it = g("abc")
>>> a = next(it)
>>> a
['a']
>>> b = next(it)
>>> b
['b']

but only until you look back at the previous item:

>>> a
['b']

Once you understand what is going on the fix is easy -- don't reuse the 
mutable object:

>>> def g(items):
...     for item in items:
...             yield [item]
...
>>> list(g("abc"))
[['a'], ['b'], ['c']]




From hetchkay at gmail.com  Sat Sep 10 03:19:42 2011
From: hetchkay at gmail.com (hetchkay)
Date: Sat, 10 Sep 2011 00:19:42 -0700 (PDT)
Subject: Applying a function recursively
Message-ID: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>

Hi,
I want to apply a "convert" function on an object as follows:
If the object is of MyType type, invoke the passed in function.
If the object is a dictionary, apply on the keys and values of the
dictionary recursively.
If the object is a set, list or tuple, apply on each element
recursively.
Else, leave the object as is.

I wrote the following code:
def convert(obj, func):
   if isinstance(obj, MyType):
      return func(obj)
   elif isinstance(obj, dict):
      return dict((convert(key, func), convert(value, func)) for key,
value in obj.iteritems())
   elif isinstance(obj, (list, tuple, set)):
      return obj.__class__(convert(x, func) for x in obj)
   else:
      return obj

Is there a better way to do this?
Is there any way I can make this code faster?

Regards,
Krishnan


From clp2 at rebertia.com  Sat Sep 10 03:40:51 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 10 Sep 2011 00:40:51 -0700
Subject: Applying a function recursively
In-Reply-To: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
Message-ID: <CAMZYqRRiD9QeUqu709=DhRQ5BNiv0qGRMDzHoXF-=56UDSG7Uw@mail.gmail.com>

On Sat, Sep 10, 2011 at 12:19 AM, hetchkay <hetchkay at gmail.com> wrote:
> Hi,
> I want to apply a "convert" function on an object as follows:
> If the object is of MyType type, invoke the passed in function.
> If the object is a dictionary, apply on the keys and values of the
> dictionary recursively.
> If the object is a set, list or tuple, apply on each element
> recursively.
> Else, leave the object as is.
>
> I wrote the following code:
> def convert(obj, func):
> ? if isinstance(obj, MyType):
> ? ? ?return func(obj)
> ? elif isinstance(obj, dict):
> ? ? ?return dict((convert(key, func), convert(value, func)) for key,
> value in obj.iteritems())
> ? elif isinstance(obj, (list, tuple, set)):
> ? ? ?return obj.__class__(convert(x, func) for x in obj)
> ? else:
> ? ? ?return obj
>
> Is there a better way to do this?

None comes to mind.

> Is there any way I can make this code faster?

Possibly, but it involves ignoring subclasses, and may not actually be
faster in your particular case (it comes down to additional function
calls vs. cost of if-elif-else chain). It would be along the lines of:

def convert_mytype(obj, func):
    return func(obj)

def convert_dict(obj, func):
    return dict((convert(key, func), convert(value, func)) for key,
value in obj.iteritems())

def dont_convert(obj, func):
    return obj

TYPE2FUNC = {MyType : convert_mytype, dict : convert_dict, ... }

def convert(obj, func):
    return TYPE2FUNC.get(type(obj), dont_convert)(obj, func)


As they say though, premature optimization is the root of all evil.

Cheers,
Chris
--
http://rebertia.com


From ben+python at benfinney.id.au  Sat Sep 10 04:13:18 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 10 Sep 2011 18:13:18 +1000
Subject: Applying a function recursively
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
Message-ID: <87ipp0n7c1.fsf@benfinney.id.au>

hetchkay <hetchkay at gmail.com> writes:

> Hi,
> I want to apply a "convert" function on an object as follows:
> If the object is of MyType type, invoke the passed in function.
> If the object is a dictionary, apply on the keys and values of the
> dictionary recursively.
> If the object is a set, list or tuple, apply on each element
> recursively.
> Else, leave the object as is.

That smells like a bad design. Why are you using the same function for
al of those different behaviours?

That's not merely rhetorical; the design isn't absolutely wrong. But
it's wrong often enough that you need to have a compelling reason to
make such a complex behaviour in a single function.

I suspect, if you can be explicit about the goal you're aiming for with
this code, a better design can be found that doesn't require all those
polymorphism-breaking type checks.

-- 
 \      ?An expert is a man who has made all the mistakes which can be |
  `\                         made in a very narrow field.? ?Niels Bohr |
_o__)                                                                  |
Ben Finney


From cs at zip.com.au  Sat Sep 10 04:49:38 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 10 Sep 2011 18:49:38 +1000
Subject: killing a script
In-Reply-To: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
References: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110910084938.GA14021@cskk.homeip.net>

On 10Sep2011 11:25, Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
| Cameron Simpson wrote:
| > My copy of the 2.7 docs says:
| >   This is implemented by calling the Standard C function system(), and
| >   has the same limitations.
| > and sure enough, "man 3 system" says:
| 
| I don't consider having to look up documentation for a function in a
| completely different language (in this case, C) as "documented behaviour of
| os.system". 

You're kidding, surely? A wrapper function for a system supplied function
should recite everything about the wrapped function's behaviour (including
the system dependent stuff) in the wrapper doco?

| Does the C standard define the behaviour of system(), or is that
| implementation dependent?

The standard specifies the core behaviour - the behaviour guarrenteed to
be present everywhere. Plenty of stuff has platform dependent minor
nuances. As long as portable code relies only on the standard behaviour
everybody wins.

| It sounds to me that the Python developers are
| implicitly refusing responsibility for the detailed behaviour of os.system
| by noting that it depends on the C function.

Of course they are, and they are right to do so. But noting that it
calls the standard function does guarrentee various things about what it
does.

| What do Jython, PyPy and
| IronPython do?
| 
| Perhaps the docs for os.system should explicitly note that the behaviour is
| implementation dependent, rather than just hint at it. Either that or
| explicitly state what os.system does.

I find it hard to understand how anyone can read this text:

  This is implemented by calling the Standard C function system(), and
  has the same limitations

and not imagine it to be dependent on the specification for system().

| > Continuing with the Python docs for os.system: 
| > 
| >   On Unix, the return value is the exit status of the process encoded in
| >   the format specified for wait().
| > 
| > and it is easy to inspect that value for "the subprocess died from a
| > signal". Not inspecting the exit status correctly will always be an
| > opportunity for incorrect app behaviour.
| 
| Except that the subprocess can catch the KeyboardInterrupt before exiting,

This is very true, though such programs usually have a special reason to
do so - the default aborting behaviour is often sufficient.

| and there's no guarantee that it will return an appropriate error code.

Of course. However, the subprocess should still exit with a nonzero exit
status (unless it it written badly). If the caller considers success of
the called program to be important, it should probably be aborting if
the returned value is nonzero anyway.

But yeah, people should probably be reaching for subprocess if they want
to notice SIGINT specially.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

But pessimism IS realism!       - D.L.Bahr


From kushal.kumaran+python at gmail.com  Sat Sep 10 05:19:08 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Sat, 10 Sep 2011 14:49:08 +0530
Subject: A bit of a boggle about subprocess.poll() and the codes it
	receives from a process
In-Reply-To: <CAFB6qZuFNbK80QO6=kdzLZY2RV1w=q35wTzQdxZxJN33iYPg-w@mail.gmail.com>
References: <CAFB6qZuFNbK80QO6=kdzLZY2RV1w=q35wTzQdxZxJN33iYPg-w@mail.gmail.com>
Message-ID: <CAH8GtdM4_kKC4N4zbZ=6ugK_o7e76uPL9ieYg3gA0+vJ_1Wk7g@mail.gmail.com>

On Fri, Sep 9, 2011 at 11:02 PM, J <dreadpiratejeff at gmail.com> wrote:
> Hi,
> I need a bit of help sorting this out...
> I have a memory test script that is a bit of compiled C. ?The test itself
> can only ever return a 0 or 1 exit code, this is explicitly coded and there
> are no other options.
> I also have a wrapper test script that calls the C program that should also
> only return 0 or 1 on completion.
> The problem i'm encountering, however, involves the return code when
> subprocess.poll() is called against the running memory test process. ?The
> current code in my wrapper program looks like this:
> def run_processes(self, number, command):
> ? ? ? ? passed = True
> ? ? ? ? pipe = []
> ? ? ? ? for i in range(number):
> ? ? ? ? ? ? pipe.append(self._command(command))
> ? ? ? ? ? ? print "Started: process %u pid %u: %s" % (i, pipe[i].pid,
> command)
> ? ? ? ? sys.stdout.flush()
> ? ? ? ? waiting = True
> ? ? ? ? while waiting:
> ? ? ? ? ? ? waiting = False
> ? ? ? ? ? ? for i in range(number):
> ? ? ? ? ? ? ? ? if pipe[i]:
> ? ? ? ? ? ? ? ? ? ? line = pipe[i].communicate()[0]
> ? ? ? ? ? ? ? ? ? ? if line and len(line) > 1:
> ? ? ? ? ? ? ? ? ? ? ? ? print "process %u pid %u: %s" % (i, pipe[i].pid,
> line)
> ? ? ? ? ? ? ? ? ? ? ? ? sys.stdout.flush()
> ? ? ? ? ? ? ? ? ? ? if pipe[i].poll() == -1:
> ? ? ? ? ? ? ? ? ? ? ? ? waiting = True
> ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? return_value = pipe[i].poll()
> ? ? ? ? ? ? ? ? ? ? ? ? if return_value != 0:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? print "Error: process ?%u pid %u retuned %u" %
> (i, pipe[i].pid, return_value)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? passed = False
> ? ? ? ? ? ? ? ? ? ? ? ? print "process %u pid %u returned success" % (i,
> pipe[i].pid)
> ? ? ? ? ? ? ? ? ? ? ? ? pipe[i] = None
> ? ? ? ? sys.stdout.flush()
> ? ? ? ? return passed
> So what happens here is that in the waiting loop, if pipe[i].poll returns a
> -1, we keep waiting, and then if it returns anything OTHER than -1, we exit
> and return the return code.

Does self._command return a subprocess.Popen object?  The
documentation at
http://docs.python.org/library/subprocess.html#subprocess.Popen.poll
says that the poll method sets and returns the returncode attribute.
returncode is expected to be None until the process terminates, and a
negative value indicates that the subprocess has been terminated
because of a signal.  If poll() returns -1, it means that the process
has been terminated by signal number 1 (probably SIGHUP).

> BUT, I'm getting, in some cases, a return code of 127, which is impossible
> to get from the memory test program.
> The output from this bit of code looks like this in a failing situation:
> Error: process 0 pid 2187 retuned 127
> process 0 pid 2187 returned success
> Error: process 1 pid 2188 retuned 127
> process 1 pid 2188 returned success
> I'm thinking that I'm hitting some sort of race here where the kernel is
> reporting -1 while the process is running, then returns 127 or some other
> status when the process is being killed and then finally 0 or 1 after the
> process has completely closed out. ?I "think" that the poll picks up this
> intermediate exit status and immediately exits the loop, instead of waiting
> for a 0 or 1.
> I've got a modified version that I'm getting someone to test for me now that
> changes
> ?if pipe[i].poll() == -1:
> ? ? ?waiting = True
> to this
> if pipe[i].poll() not in [0,1]:
> ? ? waiting = True
> So my real question is: am I on the right track here, and am I correct in my
> guess that the kernel is reporting different status codes to
> subprocess.poll() during the shutdown of the polled process?
>

I'm unaware of any such race condition.  It is more likely that the
program you are running can return such error codes.  Perhaps you
should examine its stderr output.

It's unclear what you're trying to do here.  If you'd just like to
wait until all the started processes are finished, you should use the
wait() method instead of the poll() method.  You should also note that
the communicate() method already waits for the process to complete, so
further calls to poll() and wait() are superfluous.  Normally, after
communicate() returns, you would simply check pipe[i].returncode and
be on your way.

-- 
regards,
kushal


From nobody at nowhere.com  Sat Sep 10 05:33:03 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 10 Sep 2011 10:33:03 +0100
Subject: try... except with unknown error types
References: <mailman.230.1313780957.27778.python-list@python.org>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.286.1313956388.27778.python-list@python.org>
	<j3m7fe0284i@news3.newsguy.com>
Message-ID: <pan.2011.09.10.09.33.03.485000@nowhere.com>

On Wed, 31 Aug 2011 21:01:34 +0000, Chris Torek wrote:

> Still, it sure would be nice to have a static analysis
> tool that could answer questions about potential exceptions. :-) )

That's an impossibility in a dynamic language.

If you call f.read() where f was passed in as a parameter, the exceptions
which f.read() may throw depend upon exactly what f is; there's no
guarantee that it will actually be a built-in file object, only that it
will have a .read() method (otherwise you will get an AttributeError).

Even if f was returned from open(), there's no guarantee that
__builtins__.open() won't have been replaced by the time of the call.



From nobody at nowhere.com  Sat Sep 10 05:47:29 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 10 Sep 2011 10:47:29 +0100
Subject: killing a script
References: <4e6a0382$0$29982$c3e8da3$5496439d@news.astraweb.com>
	<mailman.917.1315607348.27778.python-list@python.org>
	<4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.10.09.47.28.932000@nowhere.com>

On Sat, 10 Sep 2011 11:25:40 +1000, Steven D'Aprano wrote:

>> and sure enough, "man 3 system" says:
> 
> I don't consider having to look up documentation for a function in a
> completely different language (in this case, C) as "documented behaviour of
> os.system". 

Well, tough luck. os.system() is a wrapper around the platform's system().
The authors of the Python documentation cannot possibly know what that
function will do on all platforms, even less so once you factor in the
user's ability to replace that function via platform-specific means.

> Does the C standard define the behaviour of system(), or is that
> implementation dependent?

The C99 standard says:

       7.20.4.5  The system function

       Synopsis

       [#1]

               #include <stdlib.h>
               int system(const char *string);

       Description

       [#2] If string  is  a  null  pointer,  the  system  function
       determines  whether  the  host  environment  has  a  command
       processor. If string is  not  a  null  pointer,  the  system
       function  passes  the  string  pointed  to by string to that
       command processor to be  executed  in  a  manner  which  the
       implementation  shall  document;  this  might then cause the
       program calling system to behave in a non-conforming  manner
       or to terminate.

       Returns

       [#3]  If the argument is a null pointer, the system function
       returns nonzero only if a command  processor  is  available.
       If  the  argument  is  not  a  null  pointer, and the system
       function does return, it returns  an  implementation-defined
       value.

It doesn't require a platform to even have a command interpreter, let
alone specify its behaviour. On Unix, system() is defined to use /bin/sh,
which ought to be some kind of Bourne shell; but even then, it might be a
minimal shell such as dash or something with many extensions such as bash.
On Windows, it uses the interpreter specified by the COMSPEC environment
variable, or cmd.exe (NT-based) or command.com (DOS-based) if COMSPEC
isn't set (in either case, PATH is used).

> It sounds to me that the Python developers are
> implicitly refusing responsibility for the detailed behaviour of os.system
> by noting that it depends on the C function.

Indeed. Which is the correct thing to do. Practically every function in
the os module does likewise.

> What do Jython, PyPy and IronPython do?
 
I don't know, but I would expect them to use libc's system() function,
except for Jython which might use java.lang.Runtime.exec().




From nobody at nowhere.com  Sat Sep 10 06:11:37 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 10 Sep 2011 11:11:37 +0100
Subject: How to structure packages
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<mailman.890.1315532266.27778.python-list@python.org>
Message-ID: <pan.2011.09.10.10.11.37.104000@nowhere.com>

On Fri, 09 Sep 2011 11:37:44 +1000, Chris Angelico wrote:

>> The Java compiler also acts as a "make" program. If it doesn't find
>> a .class file for a needed class, it will search for the corresponding
>> .java file and compile that. So to compile a complex program, you only
>> need to compile the top-level file (e.g. HelloWorld.java), and it will
>> compile everything which is required. No Makefile is needed, as the
>> relationship between classes, object files and source files is fixed.
>>
> 
> If that's the entire benefit, then I think this is a rather hefty
> price to pay for the elimination of a makefile.

It also eliminates the need for TAGS files, browser database (PDB) files,
etc. Once you know the class name, all of the filenames follow from that.

I suspect that the one-to-one correspondence between classes and .class
files is mostly technical (e.g. Java's security model). The one-to-one
correspondence between class files and source files could probably be
relaxed, but at the expense of complicating the IDE and toolchain.

I never saw it as a problem, given that Java is fundamentally class-based:
there are no global variables or functions, only classes.



From __peter__ at web.de  Sat Sep 10 06:17:23 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 12:17:23 +0200
Subject: try... except with unknown error types
References: <mailman.230.1313780957.27778.python-list@python.org>
	<4e5015ad$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<7xty9ahb84.fsf@ruckus.brouhaha.com>
	<mailman.286.1313956388.27778.python-list@python.org>
	<j3m7fe0284i@news3.newsguy.com>
Message-ID: <j4fdf5$l0s$4@dough.gmane.org>

Chris Torek wrote:

> >>> import socket
> >>> isinstance(socket.error, IOError)
> False

Here you test if the socket.error *class* is an instance of IOError; this 
would print True if IOError were socket.error's metaclass. However:

>>> isinstance(socket.error(), IOError)
True

or more directly:

>>> issubclass(socket.error, IOError)
True
>>> issubclass(socket.error, EnvironmentError)
True

This is a relatively recent change:

$ python2.5 -c'from socket import error; print issubclass(error, IOError), 
issubclass(error, EnvironmentError)'
False False
$ python2.6 -c'from socket import error; print issubclass(error, IOError), 
issubclass(error, EnvironmentError)'
True True



From rosuav at gmail.com  Sat Sep 10 06:29:57 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 10 Sep 2011 20:29:57 +1000
Subject: How to structure packages
In-Reply-To: <pan.2011.09.10.10.11.37.104000@nowhere.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>
	<mailman.842.1315416661.27778.python-list@python.org>
	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>
	<pan.2011.09.09.00.45.41.959000@nowhere.com>
	<mailman.890.1315532266.27778.python-list@python.org>
	<pan.2011.09.10.10.11.37.104000@nowhere.com>
Message-ID: <CAPTjJmoQCZ7RVtN-kU0YvXOrjqAc=6=KLCj+Db16SAnnENRdHg@mail.gmail.com>

On Sat, Sep 10, 2011 at 8:11 PM, Nobody <nobody at nowhere.com> wrote:
> I suspect that the one-to-one correspondence between classes and .class
> files is mostly technical (e.g. Java's security model). The one-to-one
> correspondence between class files and source files could probably be
> relaxed, but at the expense of complicating the IDE and toolchain.

One class per object file isn't a problem - you can always .jar your
classes if the proliferation of small files bothers you, and then it's
just a different way of indexing the mound of code.

One class per source file complicates the human's view in order to
simplify the tools'. Not sure that's really worthwhile.

> I never saw it as a problem, given that Java is fundamentally class-based:
> there are no global variables or functions, only classes.

Yeah... of course you can easily simulate globals with static members
in a dedicated class, but it's slower. THIS, though, is where Java's
security model comes in - you can assign security X to Globals1.class
and security Y to Globals2.class, rather than trying to juggle
security issues in a monolithic "globals" namespace. IMHO it's not
worth the hassle, though. I'd rather just have globals.

ChrisA


From wm at localhost.localdomain  Sat Sep 10 06:32:40 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Sat, 10 Sep 2011 12:32:40 +0200
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <eeimd1h6ntq0$.dlg@localhost.localdomain>

On Fri, 09 Sep 2011 23:03:10 +1000, Steven D'Aprano wrote:
> But think carefully before doing this. Some functions may be confused if you
> change directories while they are running. You may be better off staying in
> the same directory, and adjusting the path names to the files as you work
> with them.

Curious.
Do you mean multi-threaded environment or even in single thread?
If the latter is the case, I'd say those functions make 
very nasty assumptions. Who are they, anyways? ;)

Br.
Waldek


From mark.dufour at gmail.com  Sat Sep 10 07:08:43 2011
From: mark.dufour at gmail.com (Mark Dufour)
Date: Sat, 10 Sep 2011 13:08:43 +0200
Subject: [ANN] Shed Skin 0.9
Message-ID: <CA+m65S00vX2ni-xZxVQO3_iY6bXW7S=A3zpi6+bkWmmvSDwdYQ@mail.gmail.com>

Hi all,

I have just released version 0.9 of Shed Skin, a (restricted-)Python to C++
compiler.

Please see my blog for the full announcement:

http://shed-skin.blogspot.com

The Shed Skin homepage is located here:

http://shedskin.googlecode.com


Thanks!
Mark Dufour.
-- 
http://www.youtube.com/watch?v=E6LsfnBmdnk
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From steve+comp.lang.python at pearwood.info  Sat Sep 10 07:11:32 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 10 Sep 2011 21:11:32 +1000
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<eeimd1h6ntq0$.dlg@localhost.localdomain>
Message-ID: <4e6b45e6$0$29970$c3e8da3$5496439d@news.astraweb.com>

Waldek M. wrote:

> On Fri, 09 Sep 2011 23:03:10 +1000, Steven D'Aprano wrote:
>> But think carefully before doing this. Some functions may be confused if
>> you change directories while they are running. You may be better off
>> staying in the same directory, and adjusting the path names to the files
>> as you work with them.
> 
> Curious.
> Do you mean multi-threaded environment or even in single thread?
> If the latter is the case, I'd say those functions make
> very nasty assumptions. Who are they, anyways? ;)

The main one that comes to mind is os.walk, which has this to say:

    Caution:  if you pass a relative pathname for top, don't change the
    current working directory between resumptions of walk.  walk never
    changes the current directory, and assumes that the client doesn't
    either.

Seems like a reasonable assumption to me.

-- 
Steven



From laddosingh at gmail.com  Sat Sep 10 07:20:17 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sat, 10 Sep 2011 04:20:17 -0700 (PDT)
Subject: Doctest failing
Message-ID: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>

Hi guys.

I'm strugglin with some homework stuff and am hoping you can help me
out here.

This is the code:

small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')

def book_title(title):
    """ Takes a string and returns a title-case string.
    All words EXCEPT for small words are made title case
    unless the string starts with a preposition, in which
    case the word is correctly capitalized.
    >>> book_title('DIVE Into python')
    'Dive into Python'
    >>> book_title('the great gatsby')
    'The Great Gatsby'
    >>> book_title('the WORKS OF AleXANDer dumas')
    'The Works of Alexander Dumas'
    """
    new_title = []
    title_split = title.strip().lower().split()
    for word in title_split:
        if title_split[0] in small_words:
            new_title.append(word.title())
        elif word in small_words:
            new_title.append(word.lower())
        else:
            new_title.append(word.title())
    return(' '.join(new_title))

def _test():
    import doctest, refactory
    return doctest.testmod(refactory)
if __name__ == "__main__":
    _test()

All tests are failing even though I am getting the correct output on
the first two tests. And the last test still gives me "Of" instead of
"of"

Any help is appreciated.

Rgds

T


From mwilson at the-wire.com  Sat Sep 10 07:43:38 2011
From: mwilson at the-wire.com (Mel)
Date: Sat, 10 Sep 2011 07:43:38 -0400
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <j4fihi$5ao$1@speranza.aioe.org>

Tigerstyle wrote:

> Hi guys.
> 
> I'm strugglin with some homework stuff and am hoping you can help me
> out here.
> 
> This is the code:
> 
> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> 
> def book_title(title):
>     """ Takes a string and returns a title-case string.
>     All words EXCEPT for small words are made title case
>     unless the string starts with a preposition, in which
>     case the word is correctly capitalized.
>     >>> book_title('DIVE Into python')
>     'Dive into Python'
>     >>> book_title('the great gatsby')
>     'The Great Gatsby'
>     >>> book_title('the WORKS OF AleXANDer dumas')
>     'The Works of Alexander Dumas'
>     """
>     new_title = []
>     title_split = title.strip().lower().split()
>     for word in title_split:
>         if title_split[0] in small_words:
>             new_title.append(word.title())
>         elif word in small_words:
>             new_title.append(word.lower())
>         else:
>             new_title.append(word.title())
>     return(' '.join(new_title))
> 
> def _test():
>     import doctest, refactory
>     return doctest.testmod(refactory)
> if __name__ == "__main__":
>     _test()
> 
> All tests are failing even though I am getting the correct output on
> the first two tests. And the last test still gives me "Of" instead of
> "of"
> 
> Any help is appreciated.

I don't know about doctest -- I suspect it wants a structured docstring to 
specify the tests -- but this

        if title_split[0] in small_words:
            new_title.append(word.title())

can't be what you want.

	Mel.



From __peter__ at web.de  Sat Sep 10 07:47:04 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 13:47:04 +0200
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <j4fin9$ibm$2@dough.gmane.org>

Tigerstyle wrote:

> I'm strugglin with some homework stuff and am hoping you can help me
> out here.
> 
> This is the code:
> 
> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')

>     new_title = []
>     title_split = title.strip().lower().split()
>     for word in title_split:
>         if title_split[0] in small_words:
>             new_title.append(word.title())
>         elif word in small_words:
>             new_title.append(word.lower())
>         else:
>             new_title.append(word.title())

The logic of the for-loop is flawed; the expression 

title_split[0] in small_words

will always evaluate to True if the first word is a "small word", even when 
the loop is already past the first word. You can work around that with a 
flag along these lines

first = True
for word in title_split:
    if first:
        # special treatment for the first word
        first = False
    else:
        # put checks for all words but the first here
    new_title.append(fixed_word) # assuming you have stored the titlecased
                                 # or lowercased word in the fixed_word
                                 # variable



From t at jollybox.de  Sat Sep 10 07:50:14 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sat, 10 Sep 2011 13:50:14 +0200
Subject: Doctest failing
In-Reply-To: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <4E6B4EF6.6050200@jollybox.de>

On 10/09/11 13:20, Tigerstyle wrote:
> Hi guys.
> 
> I'm strugglin with some homework stuff and am hoping you can help me
> out here.
>
> All tests are failing even though I am getting the correct output on
> the first two tests. And the last test still gives me "Of" instead of
> "of"

Cannot reproduce. I only get the one, expected, failure.

% python -m doctest books.py
**********************************************************************
File "books.py", line 12, in books.book_title
Failed example:
    book_title('the WORKS OF AleXANDer dumas')
Expected:
    'The Works of Alexander Dumas'
Got:
    'The Works Of Alexander Dumas'
**********************************************************************
1 items had failures:
   1 of   3 in books.book_title
***Test Failed*** 1 failures.

>
> def _test():
>     import doctest, refactory
>     return doctest.testmod(refactory)
> if __name__ == "__main__":
>     _test()
>

What is this "refactory"? Are you testing the right code? What is the
output of your test - does it make sense for the module?

Thomas


From dreyemi at gmail.com  Sat Sep 10 07:58:35 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sat, 10 Sep 2011 12:58:35 +0100
Subject: test if a subclass inherits a superclass method
Message-ID: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>

Hello,

I'm testing Python's class abstractness and inheritance. Since interface
doesn't exist, I will
like to test how to have access to a superclass method from a subclass
without necessary
invoking or overriding the superclass method in its subclass.

>>> class Equipment(object):
...     def fault():
...             return "fault"
...
>>> Equipment().__class__
<class '__main__.Equipment'>
>>> class Vehicle(Equipment):
...      # Find out here if Vehicle has access to fault

I want to know whether Vehicle has access to Equipment's fault() method.
Just want to know if it's there(that a vehicle can also develop a fault).

I know I can override it, but I want to know if I can use it directly
without overriding it.
-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From dreyemi at gmail.com  Sat Sep 10 08:05:08 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sat, 10 Sep 2011 13:05:08 +0100
Subject: test if a subclass inherits a superclass method
In-Reply-To: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
References: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
Message-ID: <CAPbrmCtFwcOrOCEjuyyAqK9iEkN5hXovcmMSOaBtd3GtOLkHhg@mail.gmail.com>

On Sat, Sep 10, 2011 at 12:58 PM, Kayode Odeyemi <dreyemi at gmail.com> wrote:

> Hello,
>
> I'm testing Python's class abstractness and inheritance. Since interface
> doesn't exist, I will
> like to test how to have access to a superclass method from a subclass
> without necessary
> invoking or overriding the superclass method in its subclass.
>
> >>> class Equipment(object):
> ...     def fault():
> ...             return "fault"
> ...
> >>> Equipment().__class__
> <class '__main__.Equipment'>
> >>> class Vehicle(Equipment):
> ...      # Find out here if Vehicle has access to fault
>
> I want to know whether Vehicle has access to Equipment's fault() method.
> Just want to know if it's there(that a vehicle can also develop a fault).
>
> I know I can override it, but I want to know if I can use it directly
> without overriding it.
>

OK! I figured it out like this:

>>> v = Vehicle()
>>> dir(v)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__',
'__getattribut
e__', '__hash__', '__init__', '__module__', '__new__', '__reduce__',
'__reduce_e
x__', '__repr__', '__setattr__', '__sizeof__', '__str__',
'__subclasshook__', '_
_weakref__', 'fault']

Cool stuff.

-- 
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>
>


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From alister.ware at ntlworld.com  Sat Sep 10 08:24:25 2011
From: alister.ware at ntlworld.com (Alister Ware)
Date: Sat, 10 Sep 2011 12:24:25 GMT
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <ZFIaq.3398$GZ.577@newsfe03.ams2>

On Sat, 10 Sep 2011 04:20:17 -0700, Tigerstyle wrote:

> Hi guys.
> 
> I'm strugglin with some homework stuff and am hoping you can help me out
> here.
> 
> This is the code:
> 
> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> 
> def book_title(title):
>     """ Takes a string and returns a title-case string. All words EXCEPT
>     for small words are made title case unless the string starts with a
>     preposition, in which case the word is correctly capitalized.
>     >>> book_title('DIVE Into python')
>     'Dive into Python'
>     >>> book_title('the great gatsby')
>     'The Great Gatsby'
>     >>> book_title('the WORKS OF AleXANDer dumas')
>     'The Works of Alexander Dumas'
>     """
>     new_title = []
>     title_split = title.strip().lower().split()
>     for word in title_split:
>         if title_split[0] in small_words:
>             new_title.append(word.title())
>         elif word in small_words:
>             new_title.append(word.lower())
>         else:
>             new_title.append(word.title())
>     return(' '.join(new_title))
> 
> def _test():
>     import doctest, refactory return doctest.testmod(refactory)
> if __name__ == "__main__":
>     _test()
> 
> All tests are failing even though I am getting the correct output on the
> first two tests. And the last test still gives me "Of" instead of "of"
> 
> Any help is appreciated.
> 
> Rgds
> 
> T

Ignoring the docttests my process would be to process each word & then 
manually capitalize he 1st word, .I would als0 use a comprehension as 
makes for cleaner code:-

small_words=('into','the','a','of','at','in','for','on')

def capitalize(word):
    if word in small_words:
        return word
    else:
        return word.title()

def set_title(phrase):
    result=[ capitalize(x.lower()) for x in phrase.split(' ') ]
    result[0]=result[0].title()
    return " ".join(result)


print set_title('the works of alexander dumas')


-- 
... I don't like FRANK SINATRA or his CHILDREN.


From hetchkay at gmail.com  Sat Sep 10 09:28:49 2011
From: hetchkay at gmail.com (hetchkay)
Date: Sat, 10 Sep 2011 06:28:49 -0700 (PDT)
Subject: Applying a function recursively
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
	<87ipp0n7c1.fsf@benfinney.id.au>
Message-ID: <4ee53496-ebec-4ee5-be0c-de344ac586c8@y39g2000prd.googlegroups.com>

>
> I suspect, if you can be explicit about the goal you're aiming for with
> this code, a better design can be found that doesn't require all those
> polymorphism-breaking type checks.
>
It is difficult to explain what I am trying to do, but let me try. I
am mapping data from one hierarchy into another. The mapping rules are
quite complex. I developed a system such that the rules could be
defined as "expressions" of the source hierarchy i.e a particular
entry in the target hierarchy could be represented as an expression of
entries in the source hierarchy. Suppose a point is stored in x, y
coordinates in the source hierarchy, and in polar coordinates in the
target hierarchy, I could write (forget for the moment what sourcePt
is):
pointMapping = {
  sourcePt.key : dict(
     radius = Sqrt(sourcePt.value['x']**2 + sourcePt.value['y']**2),
     angle = Atan(sourcePt.value['y']/sourcePt.value['x']),
   ),
}
The above dictionary is delay-evaluated. sourcePt is an instance of a
class that facilitates the delayed evaluation. Sqrt, Atan etc. are
wrappers to the math functions to facilitate delayed evaluation. When
I encounter a point object, I could 'evaluate' the above mapping for
the point object to get the target dictonary.
The actual requirements are much more involved than this. The
motivation of the design was to enable application developers (who are
not experts in python) to be able to write the mappings. The mappings
also need to be readable.
You could consider this to be some sort of DSL. However, because of
the number of rules involved, I am trying to be as close to Python
expressions as possible. If the target setting is to be a tuple, for
example, I want to be able to write the tuple directly as "( expr1,
expr2 )", rather than, say, "Tuple(expr1, expr2)".
There is also a requirement to validate the mapping on load so that
run-time errors are minimized.
The system we are developing is quite reusable and we have been able
to use it for three different mappings so far. At this point, I am
trying to profile the code and noticed that a non-trivial amount of
time is being spent in the particular function I mentioned in this
thread.

Regards,
Krishnan


From wm at localhost.localdomain  Sat Sep 10 09:57:16 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Sat, 10 Sep 2011 15:57:16 +0200
Subject: what's the command for (cd ..) in python
References: <mailman.903.1315570033.27778.python-list@python.org>
	<4e6a0e8e$0$29967$c3e8da3$5496439d@news.astraweb.com>
	<eeimd1h6ntq0$.dlg@localhost.localdomain>
	<4e6b45e6$0$29970$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <5yll66t4xv3j.dlg@localhost.localdomain>

On Sat, 10 Sep 2011 21:11:32 +1000, Steven D'Aprano wrote:
> The main one that comes to mind is os.walk, which has this to say:
> 
>     Caution:  if you pass a relative pathname for top, don't change the
>     current working directory between resumptions of walk.  walk never
>     changes the current directory, and assumes that the client doesn't
>     either.
> 
> Seems like a reasonable assumption to me.

Oh, that kind of functions.
Yes, that *is* surely reasonable, just as mixing chdir/mkdir/remove
and whatever else that affects the directory structure is not a good idea,
or at least something to be done carefully.
I just wouldn't think to give it some special credit.

Thanks
Waldek


From tyler at tysdomain.com  Sat Sep 10 10:04:24 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 08:04:24 -0600
Subject: How to structure packages
In-Reply-To: <pan.2011.09.10.10.11.37.104000@nowhere.com>
References: <2a4f542c-a8c1-46c7-9899-a3fad0940cf6@x11g2000yqc.googlegroups.com>	<mailman.842.1315416661.27778.python-list@python.org>	<4e680c67$0$29980$c3e8da3$5496439d@news.astraweb.com>	<pan.2011.09.09.00.45.41.959000@nowhere.com>	<mailman.890.1315532266.27778.python-list@python.org>
	<pan.2011.09.10.10.11.37.104000@nowhere.com>
Message-ID: <4E6B6E68.9010908@tysdomain.com>

On 9/10/2011 4:11 AM, Nobody wrote:
> On Fri, 09 Sep 2011 11:37:44 +1000, Chris Angelico wrote:
>
>>> The Java compiler also acts as a "make" program. If it doesn't find
>>> a .class file for a needed class, it will search for the corresponding
>>> .java file and compile that. So to compile a complex program, you only
>>> need to compile the top-level file (e.g. HelloWorld.java), and it will
>>> compile everything which is required. No Makefile is needed, as the
>>> relationship between classes, object files and source files is fixed.
>>>
>> If that's the entire benefit, then I think this is a rather hefty
>> price to pay for the elimination of a makefile.
> It also eliminates the need for TAGS files, browser database (PDB) files,
> etc. Once you know the class name, all of the filenames follow from that.
>
> I suspect that the one-to-one correspondence between classes and .class
> files is mostly technical (e.g. Java's security model). The one-to-one
> correspondence between class files and source files could probably be
> relaxed, but at the expense of complicating the IDE and toolchain.
>
> I never saw it as a problem, given that Java is fundamentally class-based:
> there are no global variables or functions, only classes.
>
Sure there are no global variables, but having one class per file is one 
of the big things I hate about Java. Sure it keeps things organized, but 
that's a bit to much for me.



-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From tyler at tysdomain.com  Sat Sep 10 10:08:28 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 08:08:28 -0600
Subject: test if a subclass inherits a superclass method
In-Reply-To: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
References: <CAPbrmCtw8MgCSOSuqfTDMB_cv7ruepWYxkZBnwVSW8GycHXH6g@mail.gmail.com>
Message-ID: <4E6B6F5C.8000304@tysdomain.com>

On 9/10/2011 5:58 AM, Kayode Odeyemi wrote:
> Hello,
>
> I'm testing Python's class abstractness and inheritance. Since 
> interface doesn't exist, I will
> like to test how to have access to a superclass method from a subclass 
> without necessary
> invoking or overriding the superclass method in its subclass.
>
> >>> class Equipment(object):
> ...     def fault():
> ...             return "fault"
> ...
> >>> Equipment().__class__
> <class '__main__.Equipment'>
> >>> class Vehicle(Equipment):
> ...      # Find out here if Vehicle has access to fault
>
> I want to know whether Vehicle has access to Equipment's fault() method.
> Just want to know if it's there(that a vehicle can also develop a fault).
>
> I know I can override it, but I want to know if I can use it directly 
> without overriding it.

Perhaps this helps:
http://stackoverflow.com/questions/610883/how-to-know-if-an-object-has-an-attribute-in-python

> -- 
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>


-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.

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From roy at panix.com  Sat Sep 10 10:12:32 2011
From: roy at panix.com (Roy Smith)
Date: Sat, 10 Sep 2011 10:12:32 -0400
Subject: Applying a function recursively
References: <52c256ae-81b0-4a7c-9047-42e1ae8b6eda@n19g2000prh.googlegroups.com>
	<87ipp0n7c1.fsf@benfinney.id.au>
	<4ee53496-ebec-4ee5-be0c-de344ac586c8@y39g2000prd.googlegroups.com>
Message-ID: <roy-B68F2A.10123210092011@news.panix.com>

In article 
<4ee53496-ebec-4ee5-be0c-de344ac586c8 at y39g2000prd.googlegroups.com>,
 hetchkay <hetchkay at gmail.com> wrote:

[complicated description elided]
> You could consider this to be some sort of DSL. However, because of
> the number of rules involved, I am trying to be as close to Python
> expressions as possible. If the target setting is to be a tuple, for
> example, I want to be able to write the tuple directly as "( expr1,
> expr2 )", rather than, say, "Tuple(expr1, expr2)".
> There is also a requirement to validate the mapping on load so that
> run-time errors are minimized.

I assume by DSL you mean Domain Specific Language?  Having worked with a 
number of DSLs, my emphatic recommendation is DON'T DO IT!

What you will end up with is a language which is almost, but not quite, 
like some other existing language.  That means the people who use it 
will need to learn something new.  If you make it "as close to Python as 
possible", all that will happen is people will assume it's Python, and 
constantly be surprised when things don't work the same way.

Whatever features of "real Python" you left out, people will invariably 
be clamoring for.  Eventually, you will be forced to duct-tape them into 
the language.  You will end up bogged down forever in language 
maintenance, adding features, fixing bugs, writing documentation, 
providing tech support, etc.

Think of all the ecosystem stuff which grows up around a real language.  
Debuggers.  Profilers.  Language-aware editors (or plugins to emacs, 
eclipse, etc).  Add-in libraries to do a zillion things you never 
thought you would want to do.  Hoards of really smart and enthusiastic 
people on mailing lists, newsgroups, Stack Overflow, etc willing to help 
out with problems.  Books.  Professional training courses.  You will end 
up with replicating all that, or doing without.

It sounds like what you really want to do is just use Python as your 
scripting language.  The lazy evaluation features you desire can be 
handled by writing some library code.


From wentlv at gmail.com  Sat Sep 10 11:41:20 2011
From: wentlv at gmail.com (crow)
Date: Sat, 10 Sep 2011 08:41:20 -0700 (PDT)
Subject: Is there anyway to use urllib2 to download a file from http server?
Message-ID: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>

As the title.

Or is there other module that can handle this task?

Many thanks in advance


From stefan_ml at behnel.de  Sat Sep 10 11:53:12 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 10 Sep 2011 17:53:12 +0200
Subject: Is there anyway to use urllib2 to download a file from http
	server?
In-Reply-To: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
References: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
Message-ID: <j4g158$7ss$1@dough.gmane.org>

crow, 10.09.2011 17:41:
> As the title.
>
> Or is there other module that can handle this task?

Did you notice that is has documentation?

http://docs.python.org/library/urllib2.html#examples

Stefan



From rosuav at gmail.com  Sat Sep 10 11:56:32 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 11 Sep 2011 01:56:32 +1000
Subject: Doctest failing
In-Reply-To: <ZFIaq.3398$GZ.577@newsfe03.ams2>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
Message-ID: <CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>

On Sat, Sep 10, 2011 at 10:24 PM, Alister Ware
<alister.ware at ntlworld.com> wrote:
> Ignoring the docttests my process would be to process each word & then
> manually capitalize he 1st word, .I would als0 use a comprehension as
> makes for cleaner code:-
>
> def capitalize(word):
> ? ?if word in small_words:
> ? ? ? ?return word
> ? ?else:
> ? ? ? ?return word.title()

And I'd do this with a lambda, but that's just me. Of course, if your
logic is more complicated, it makes more sense to keep it in a named
function, but a single conditional call can fit nicely into a lambda.

ChrisA


From tjreedy at udel.edu  Sat Sep 10 13:34:19 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 13:34:19 -0400
Subject: [ANN] Shed Skin 0.9
In-Reply-To: <CA+m65S00vX2ni-xZxVQO3_iY6bXW7S=A3zpi6+bkWmmvSDwdYQ@mail.gmail.com>
References: <CA+m65S00vX2ni-xZxVQO3_iY6bXW7S=A3zpi6+bkWmmvSDwdYQ@mail.gmail.com>
Message-ID: <j4g74l$c8u$1@dough.gmane.org>

On 9/10/2011 7:08 AM, Mark Dufour wrote:
> Hi all,
>
> I have just released version 0.9 of Shed Skin, a (restricted-)Python to
> C++ compiler.

That should say "Python2.(4-6) to C++ compiler".

I do not want to pick on Mark, who I think is doing great work, but I 
find it annoying when third-party developers use the generic 'Python' to 
refer to undisclosed older versions of Python.

> Please see my blog for the full announcement:
>
> http://shed-skin.blogspot.com <http://shed-skin.blogspot.com/>

While Mark never reveals this crucial information anywhere on this page,

> The Shed Skin homepage is located here:
>
> http://shedskin.googlecode.com <http://shedskin.googlecode.com/>

he does specify versions in the first sentence of this page. That is 
much better than some other projects.

-- 
Terry Jan Reedy



From abhijeet.manohar at gmail.com  Sat Sep 10 13:37:12 2011
From: abhijeet.manohar at gmail.com (Abhijeet Mahagaonkar)
Date: Sat, 10 Sep 2011 23:07:12 +0530
Subject: Is there anyway to use urllib2 to download a file from http
	server?
In-Reply-To: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
References: <6e23a17a-890f-46b8-b79f-1b0c8991b0de@g32g2000pri.googlegroups.com>
Message-ID: <CAB7bTqrRnGu=chxrj2PW-QX9Gn9-xta3au=U8daJ1G6p8=_9Zw@mail.gmail.com>

I guess urlretrieve() would do the job

-AB

On Sat, Sep 10, 2011 at 9:11 PM, crow <wentlv at gmail.com> wrote:

> As the title.
>
> Or is there other module that can handle this task?
>
> Many thanks in advance
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tjreedy at udel.edu  Sat Sep 10 13:59:02 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 13:59:02 -0400
Subject: Doctest failing
In-Reply-To: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
Message-ID: <j4g8j0$kbf$1@dough.gmane.org>

On 9/10/2011 7:20 AM, Tigerstyle wrote:
> Hi guys.
>
> I'm strugglin with some homework stuff and am hoping you can help me
> out here.

We appreciate you saying so instead of hiding that this is homework.

> small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>
> def book_title(title):
>      """ Takes a string and returns a title-case string.
>      All words EXCEPT for small words are made title case
>      unless the string starts with a preposition, in which
>      case the word is correctly capitalized.
>      >>>  book_title('DIVE Into python')
>      'Dive into Python'
>      >>>  book_title('the great gatsby')
>      'The Great Gatsby'
>      >>>  book_title('the WORKS OF AleXANDer dumas')
>      'The Works of Alexander Dumas'
>      """
>      new_title = []
>      title_split = title.strip().lower().split()

>      for word in title_split:
>          if title_split[0] in small_words:
>              new_title.append(word.title())
>          elif word in small_words:
>              new_title.append(word.lower())
>          else:
>              new_title.append(word.title())

The key issue is that you want to treat the first word one way (.title 
it) and the rest differently (conditionally .title or not) . So 
immediately separate the first from the rest and then process each. 
There are at least three ways to do the split. Perhaps I should stop 
with this hint, and certainly you should think a bit before reading 
further, but here is what I consider to be the most elegant 3.2 code.
.
,
,
,
.
.
.
     first, *rest = title.strip().lower().split()
     new_title = [first.title()]
     for word in rest:
         if word not in small_words:
             word = word.title()
         new_title.append(word)

>      return(' '.join(new_title))

doctest.testmod() now passes (there is no 'refactory' here)

> def _test():
>      import doctest, refactory
>      return doctest.testmod(refactory)
> if __name__ == "__main__":
>      _test()

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep 10 15:36:42 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 15:36:42 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
Message-ID: <j4gea4$m3b$1@dough.gmane.org>

Python's iterator protocol for an iterator 'items' allows combinations 
of explicit "next(items)" calls with the implicit calls of a "for item 
in items:" loop. There are at least three situations in which this can 
be useful. (While the code posted here is not testable, being incomplete 
or having pseudocode lines, I have tested full examples of each idiom 
with 3.2.)


1. Process first item of an iterable separately.

A traditional solution is a flag variable that is tested for each item.

first = True
<other setup>
for item in iterable:
   if first:
     <process first>
     first = False
   else:
     <process non-first>

(I have seen code like this posted on this list several times, including 
today.)

Better, to me, is to remove the first item *before* the loop.

items = iter(iterable)
<set up with next(items)
for item in items:
   <process non-first>

Sometimes <other setup> and <process first> can be combined in <setup 
with next(items)>. For instance, "result = []" followed by 
"result.append(process_first(item))" becomes "result = 
[process_first(item)]".

The statement containing the explicit next(items) call can optionally be 
wrapped to explicitly handle the case of an empty iterable in whatever 
manner is desired.

try:
     <set up with next(items)>
except StopIteration:
     raise ValueError("iterable cannot be empty")


For an iterable known to have a small number of items, the first item 
can be removed, with only a small copying penalty, with a simple assignment.

first, *rest = iterable

The older and harder to write version of this requires the iterable to 
be a sequence?

first, rest = seq[0], seq[1:]


2. Process the last item of an iterable differently. As far as I know, 
this cannot be done for a generic iterable with a flag. It requires a 
look ahead.

items = iter(iterable)
current = next(items)
for item in items:
   <process non-last current>
   current = item
<process last current>

To treat both first and last differently, pull off the first before 
binding 'current'. Wrap next() calls as desired.


3. Process the items of an iterable in pairs.

items = iter(iterable)
for first in items:
     second = next(items)
     <process first and second>

This time, StopIteration is raised for an odd number of items. Catch and 
process as desired. One possibility is to raise ValueError("Iterable 
must have an even number of items").

A useful example of just sometimes pairing is iterating a (unicode) 
string by code points ('characters') rather than by code units. This 
requires combining the surrogate pairs used for supplementary characters 
when the units are 16 bits.

chars = iter(string)
for char in chars:
     if is_first_surrogate(char):
         char += next(chars)
     yield char

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep 10 15:36:47 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 10 Sep 2011 15:36:47 -0400
Subject: Doctest failing
In-Reply-To: <j4fin9$ibm$2@dough.gmane.org>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4fin9$ibm$2@dough.gmane.org>
Message-ID: <j4gea8$m3b$2@dough.gmane.org>

On 9/10/2011 7:47 AM, Peter Otten wrote:

> You can work around that with a
> flag along these lines
>
> first = True
> for word in title_split:
>      if first:
>          # special treatment for the first word
>          first = False
>      else:
>          # put checks for all words but the first here
>      new_title.append(fixed_word) # assuming you have stored the titlecased
>                                   # or lowercased word in the fixed_word
>                                   # variable

An alternative to a flag and testing every item is to remove and process 
the first item *before* the loop. See my response on this thread or my 
new thread
Idioms combining 'next(items)' and 'for item in items:'

-- 
Terry Jan Reedy



From Phillip.M.Feldman at gmail.com  Sat Sep 10 15:57:21 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 10 Sep 2011 12:57:21 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <j4f27q$nkd$1@dough.gmane.org>
References: <32435519.post@talk.nabble.com> <j4f27q$nkd$1@dough.gmane.org>
Message-ID: <32439307.post@talk.nabble.com>


Very nice explanation!  I've circumvented the problem by returning a
`deepcopy` of the list.  I've also added an acknowledgment.  The revised
code is attached.

I'd like to see both balls in numbered boxes (this code) and balls in
unnumbered (indistinguishable) boxes in Python's `itertools` module, but
don't know whom to contact about this.  Also, I haven't yet worked out a
good algorithm for balls in unnumbered boxes.  Any suggestions will be
appreciated.

Phillip http://old.nabble.com/file/p32439307/balls_in_numbered_boxes.py
balls_in_numbered_boxes.py 
-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32439307.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From pgiri at yahoo.com  Sat Sep 10 16:05:36 2011
From: pgiri at yahoo.com (Giridhar Pemmasani)
Date: Sat, 10 Sep 2011 13:05:36 -0700 (PDT)
Subject: [ANN] dispy: distribute computations and execute in parallel 
Message-ID: <1315685136.93773.YahooMailNeo@web160614.mail.bf1.yahoo.com>

Hello,

I would like to announce dispy (http://dispy.sf.net) that can
distribute and parallelize computations among computing nodes over
network (yes, yet another implementation of parallelization). This is
useful for problems in SIMD paradigm where a computation can be
executed with multiple data simultaneously. Salient features of dispy
are:

?* Computations (Python functions or standalone programs) and its
? ?dependencies (files, Python functions, classes, modules) are
? ?distributed automatically as and when needed.

?* Computation nodes can be anywhere on the network. For security,
? ?either simple hash based authentication or SSL encryption can be
? ?used.

?* A computation may specify which nodes are allowed to execute it
? ?(for now, using simple patterns of IP addresses).

?* After each execution is finished, the results of execution, output,
? ?errors and exception trace are made available for further
? ?processing.

?* Nodes may become available dynamically: dispy will schedule jobs
? ?whenever a node is available and computations can use that node. If
? ?a node fails while executing scheduled jobs, those jobs may be
? ?resubmitted to other nodes if computations allow it.

?* dispy can be used in a single process to use all the nodes
? ?exclusively (simpler to use) or in multiple processes sharing the
? ?nodes.

Currently dispy works with Python 2.7 and has been tested with nodes
running Linux and OS X.

Thanks,
Giri
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From Phillip.M.Feldman at gmail.com  Sat Sep 10 16:32:49 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 10 Sep 2011 13:32:49 -0700 (PDT)
Subject: can't generate iterator from list
In-Reply-To: <32439307.post@talk.nabble.com>
References: <32435519.post@talk.nabble.com> <j4f27q$nkd$1@dough.gmane.org>
	<32439307.post@talk.nabble.com>
Message-ID: <32439439.post@talk.nabble.com>


I just realized that there is a defect in my algorithm, so I will try to code
this using a recursive algorithm instead.

-- 
View this message in context: http://old.nabble.com/can%27t-generate-iterator-from-list-tp32435519p32439439.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From gelonida at gmail.com  Sat Sep 10 16:43:39 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sat, 10 Sep 2011 22:43:39 +0200
Subject: optionparse: how to add a line break to the help text
Message-ID: <j4gi5r$gjc$1@dough.gmane.org>

I'm having a small question about optionparse.

Normaly optionparser will format the help text according to the
console's width.

I just wondered if there is any way to insert a line breakk into an
options help text.

Example:

from optparse import OptionParser

parser = OptionParser()
parser.add_option("-f", action="store",
    help="This option is really really complicated"
         " and I'd like to write"
         " a few paragrpahs to explain how it works."
         "\nHowever the line breaks are stripped off"
         " and it's thus difficult to structure the help text")

args = ['-h']
parser.parse_args(args)

Is there any trick to force a new paragraph/ line break before the word
'However'?


Thanks in advance for suggestions.




From __peter__ at web.de  Sat Sep 10 16:49:13 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 10 Sep 2011 22:49:13 +0200
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4fin9$ibm$2@dough.gmane.org> <j4gea8$m3b$2@dough.gmane.org>
Message-ID: <j4gifq$ihg$1@dough.gmane.org>

Terry Reedy wrote:

> On 9/10/2011 7:47 AM, Peter Otten wrote:
> 
>> You can work around that with a
>> flag along these lines
>>
>> first = True
>> for word in title_split:
>>      if first:
>>          # special treatment for the first word
>>          first = False
>>      else:
>>          # put checks for all words but the first here
>>      new_title.append(fixed_word) # assuming you have stored the
>>      titlecased
>>                                   # or lowercased word in the fixed_word
>>                                   # variable
> 
> An alternative to a flag and testing every item is to remove and process
> the first item *before* the loop. See my response on this thread or my
> new thread
> Idioms combining 'next(items)' and 'for item in items:'

I reckoned the approach with the flag the most beginner-friendly because you 
don't have to think too hard about the corner-cases, namely

>>> book_title("")
''

When I use the "process first item before the loop" approach I usually end 
up with a helper generator

def _words(words, small_words={w.title(): w for w in small_words}):
    yield next(words)
    for word in words:
        yield small_words[word] if word in small_words else word

def book_title(s):
    return " ".join(_words(iter(s.title().split())))

and the nagging thought that I'm making it more complex than need be.




From tyler at tysdomain.com  Sat Sep 10 16:53:26 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 14:53:26 -0600
Subject: using python in web applications
In-Reply-To: <87mxedm3lh.fsf@benfinney.id.au>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<87mxedm3lh.fsf@benfinney.id.au>
Message-ID: <4E6BCE46.3020002@tysdomain.com>

On 9/9/2011 10:19 PM, Ben Finney wrote:
> "Littlefield, Tyler"<tyler at tysdomain.com>  writes:
>
>> I'm curious if there are some good solutions for using Python in web
>> applications.
> Start with:
>
> <URL:http://docs.python.org/howto/webservers.html#frameworks>
> <URL:http://wiki.python.org/moin/WebFrameworks>
>

Awesome, will do, thanks.

> and try your criteria against what you find there.
>


-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From matthew.a.hess at gmail.com  Sat Sep 10 17:44:01 2011
From: matthew.a.hess at gmail.com (matt)
Date: Sat, 10 Sep 2011 14:44:01 -0700 (PDT)
Subject: IOError 35 when trying to read the result of call to
	urllib2.urlopen
References: <ca4e297e-2fd9-4881-b89d-9c0f6ab59009@a10g2000prn.googlegroups.com>
	<4e6ab711$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <0a79dcd3-92e6-4102-b202-dbb33fce634f@e34g2000prn.googlegroups.com>

On Sep 9, 6:02?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> matt wrote:
> > When I try to look at "resp_body" I get this error:
>
> > IOError: [Errno 35] Resource temporarily unavailable
>
> > I posted to the same URI using curl and it worked fine, so I don't
> > think it has to do with the server.
>
> Are your Python code and curl both using the same proxy? It may be that one
> is going direct and the other is using a proxy.
>
> Or perhaps the destination is just flaky, and the resource genuinely is
> temporarily unavailable. Or it doesn't like your useragent string and is
> lying.
>
> --
> Steven

No proxy.  It's all local over the loopback interface (probably should
have mentioned that).  The service I'm POSTing to is a Python web app
with CherryPy as the framework.  Also, because of some dependency
issues I'm using Python 2.6.


From rafadurancastaneda at gmail.com  Sat Sep 10 18:16:42 2011
From: rafadurancastaneda at gmail.com (=?ISO-8859-1?Q?Rafael_Dur=E1n_Casta=F1eda?=)
Date: Sun, 11 Sep 2011 00:16:42 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <j4gi5r$gjc$1@dough.gmane.org>
References: <j4gi5r$gjc$1@dough.gmane.org>
Message-ID: <4E6BE1CA.9030608@gmail.com>

On 10/09/11 22:43, Gelonida N wrote:
> I'm having a small question about optionparse.
>
> Normaly optionparser will format the help text according to the
> console's width.
>
> I just wondered if there is any way to insert a line breakk into an
> options help text.
>
> Example:
>
> from optparse import OptionParser
>
> parser = OptionParser()
> parser.add_option("-f", action="store",
>      help="This option is really really complicated"
>           " and I'd like to write"
>           " a few paragrpahs to explain how it works."
>           "\nHowever the line breaks are stripped off"
>           " and it's thus difficult to structure the help text")
>
> args = ['-h']
> parser.parse_args(args)
>
> Is there any trick to force a new paragraph/ line break before the word
> 'However'?
>
>
> Thanks in advance for suggestions.
>
>
You can use """ for multiple line texts:
 >>> text = \
... """fsdfsfsdfsdf
...     sfsdfsfsdf
... sdfsdf  s
...
... """
 >>> text
'fsdfsfsdfsdf\n    sfsdfsfsdf\nsdfsdf  s\n\n'




From dribnairb at gmail.com  Sat Sep 10 18:50:09 2011
From: dribnairb at gmail.com (Brian)
Date: Sat, 10 Sep 2011 15:50:09 -0700 (PDT)
Subject: Python and Outlook-style rules
References: <dc1769c1-c058-421e-900f-34a645dbf558@br5g2000vbb.googlegroups.com>
	<mailman.906.1315585191.27778.python-list@python.org>
Message-ID: <3a160e5e-0dbe-47e3-9dba-901003041bd4@d12g2000vba.googlegroups.com>

On Sep 9, 5:19?pm, Alec Taylor <alec.tayl... at gmail.com> wrote:
> Something like this?
>
> http://stackoverflow.com/questions/387606/using-user-input-to-find-in...
>

Actually, I'm looking for a framework or something similar - something
more like this, only for python:
http://www.codeproject.com/KB/macros/RulesWizard.aspx


From laurent.payot at gmail.com  Sat Sep 10 19:35:28 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 16:35:28 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>

[troll]
For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
[/troll]

"Eve Online", a well known MMORPG was developped with stackless python : http://highscalability.com/eve-online-architecture

You mentioned nginx so I can tell you I personally use Linux + nginx + mongodb (pymongo) + Python 3 version of cherrypy (with Mako templates) and it's working fine after some tuning.


From laurent.payot at gmail.com  Sat Sep 10 19:35:28 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 16:35:28 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>

[troll]
For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
[/troll]

"Eve Online", a well known MMORPG was developped with stackless python : http://highscalability.com/eve-online-architecture

You mentioned nginx so I can tell you I personally use Linux + nginx + mongodb (pymongo) + Python 3 version of cherrypy (with Mako templates) and it's working fine after some tuning.


From robert.kern at gmail.com  Sat Sep 10 19:44:02 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 10 Sep 2011 18:44:02 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <4E6BE1CA.9030608@gmail.com>
References: <j4gi5r$gjc$1@dough.gmane.org> <4E6BE1CA.9030608@gmail.com>
Message-ID: <j4gso2$i3g$1@dough.gmane.org>

On 9/10/11 5:16 PM, Rafael Dur?n Casta?eda wrote:
> On 10/09/11 22:43, Gelonida N wrote:
>> I'm having a small question about optionparse.
>>
>> Normaly optionparser will format the help text according to the
>> console's width.
>>
>> I just wondered if there is any way to insert a line breakk into an
>> options help text.
>>
>> Example:
>>
>> from optparse import OptionParser
>>
>> parser = OptionParser()
>> parser.add_option("-f", action="store",
>> help="This option is really really complicated"
>> " and I'd like to write"
>> " a few paragrpahs to explain how it works."
>> "\nHowever the line breaks are stripped off"
>> " and it's thus difficult to structure the help text")
>>
>> args = ['-h']
>> parser.parse_args(args)
>>
>> Is there any trick to force a new paragraph/ line break before the word
>> 'However'?
>>
>>
>> Thanks in advance for suggestions.
>>
>>
> You can use """ for multiple line texts:
>  >>> text = \
> ... """fsdfsfsdfsdf
> ... sfsdfsfsdf
> ... sdfsdf s
> ...
> ... """
>  >>> text
> 'fsdfsfsdfsdf\n sfsdfsfsdf\nsdfsdf s\n\n'

That's not the problem. OptionParser removes all of the original newlines that 
are in the given text when it formats the text for display. I don't think there 
is a simple workaround.

-- 
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 cs at zip.com.au  Sat Sep 10 19:50:46 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sun, 11 Sep 2011 09:50:46 +1000
Subject: what's the command for (cd ..) in python
In-Reply-To: <5yll66t4xv3j.dlg@localhost.localdomain>
References: <5yll66t4xv3j.dlg@localhost.localdomain>
Message-ID: <20110910235046.GA12648@cskk.homeip.net>

On 10Sep2011 15:57, Waldek M. <wm at localhost.localdomain> wrote:
| On Sat, 10 Sep 2011 21:11:32 +1000, Steven D'Aprano wrote:
| > The main one that comes to mind is os.walk, which has this to say:
| > 
| >     Caution:  if you pass a relative pathname for top, don't change the
| >     current working directory between resumptions of walk.  walk never
| >     changes the current directory, and assumes that the client doesn't
| >     either.
| > 
| > Seems like a reasonable assumption to me.
| 
| Oh, that kind of functions.
| Yes, that *is* surely reasonable, just as mixing chdir/mkdir/remove
| and whatever else that affects the directory structure is not a good idea,
| or at least something to be done carefully.
| I just wouldn't think to give it some special credit.

It's like umask and friends - they affect a program-wide implicit state.
Umask affects default new file permissions, chdir affects starting point
for relative pathnames, etc. All implicit.

The usual biggie with chdir is that of course your program may have been
handed relative file pathnames on the command line. They need resolving
_before_ any chdiring happens, if chdiring is going to happen.

For this kind of reason chdir, umask et al are generally best used in
top level logic only rather than inside library functions.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

It's hard to believe that something as rational as the metric system was
invented by the French. - Henry O. Farad <lrc at netcom.COM>


From gelonida at gmail.com  Sat Sep 10 20:05:13 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 02:05:13 +0200
Subject: import packet.module without importing packet.__init__ ?
Message-ID: <j4gtvq$vqq$1@dough.gmane.org>

Hi,

I am little shaky with how exactly python imports packages / modules etc.

Is it possible to import a module from a packet without importing its
__init__.py ?


Full example:
==============

# application.py ---------------------
print "starting application"
import mypacket.module1

# mypacket.__init__.py ---------------------
print "importing __init__"


# mypacket.module1.py ---------------------
print "importing module1"



The output, that I get with python 2.6 is
$ python application.py
> starting application
> importing __init__
> importing module1

Under certain circumstances I'd like to avoid the implicit import
of __init__.py

Due to other constrains of my project I am obliged to have a
non empty __init__.py






From Phillip.M.Feldman at gmail.com  Sat Sep 10 20:43:39 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 10 Sep 2011 17:43:39 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
Message-ID: <32440187.post@talk.nabble.com>


I've written a recursive class that creates an iterator to solve a general
formulation of the combinatorics problem known as "balls in numbered boxes"
(also known as "indistinguishable balls in distinguishable boxes").  The
code has been extensively tested and appears to work, but isn't terribly
elegant.  Any suggestions about how to improve it will be appreciated.

Also, I'd like to get this functionality into the Python's `itertools`
module (the present set of combinatorics functions in `itertools` does not
include "balls in boxes").  Does anyone know whom I should contact about
this?

Phillip

http://old.nabble.com/file/p32440187/balls_in_numbered_boxes.py
balls_in_numbered_boxes.py 
-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32440187.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From tyler at tysdomain.com  Sat Sep 10 20:50:21 2011
From: tyler at tysdomain.com (Littlefield, Tyler)
Date: Sat, 10 Sep 2011 18:50:21 -0600
Subject: using python in web applications
In-Reply-To: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
Message-ID: <4E6C05CD.3010905@tysdomain.com>

On 9/10/2011 5:35 PM, Laurent wrote:
> [troll]
> For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
> [/troll]
>
I replied to that one off list I guess, but I figured Django was way 
more overhead than I wanted, doesn't really fit with solving the speed 
issue.

> "Eve Online", a well known MMORPG was developped with stackless python : http://highscalability.com/eve-online-architecture
>
> You mentioned nginx so I can tell you I personally use Linux + nginx + mongodb (pymongo) + Python 3 version of cherrypy (with Mako templates) and it's working fine after some tuning.

Awesome, thanks. I'm new to this, so some of that flew over my head, but 
I'll take a look at all of them. I'm not sure of the relevance of 
stackless in this case; I was looking into PyPy, but I'm not really sure 
whether that can be connected with nginx. I guess I could just write the 
web server in Python and use it from that point.

-- 

Take care,
Ty
Web: http://tds-solutions.net
The Aspen project: a light-weight barebones mud engine
http://code.google.com/p/aspenmud

Sent from my toaster.



From steve+comp.lang.python at pearwood.info  Sat Sep 10 20:56:42 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 10:56:42 +1000
Subject: import packet.module without importing packet.__init__ ?
References: <mailman.958.1315699526.27778.python-list@python.org>
Message-ID: <4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>

Gelonida N wrote:


> Is it possible to import a module from a packet without importing its
> __init__.py ?

Untested, but I think so. But you shouldn't. The solution (if it does work,
as I said I haven't tested it) is a hack.

Suppose you have a library like this:

modules/
+-- spam.py
+-- ham.py
+-- package/
    +-- __init__.py
    +-- cheese.py

The directory "modules" is in your Python path, so you can "import spam"
or "import package". The trick is to add "modules/package" to the Python
path so that "import cheese" will find cheese.py directly.

You can do that by manipulating sys.path, or by setting the environment
variable PYTHONPATH.

Another hack would be to add a hard link to the top level:

modules/
+-- spam.py
+-- ham.py
+-- cheese.py <------------+
+-- package/               |
    +-- __init__.py        |
    +-- cheese.py <--------+


This is not a copy, it is a hard link: the same file appears in literally
two places. (But note that not all file systems support hard linking.) Soft
links or shortcuts might also work. Now you can "import cheese".

But generally, you should design your package so that it doesn't matter
whether or not __init__.py is imported first. I see three reasnable
situations:

(1) package.cheese should rely on package, in which case it requires
package.__init__ to be imported first. (Sometimes I put code common to the
entire package in __init__.py.)

(2) Just don't worry about the fact that package.__init__ gets imported
first. Do you have any idea how many modules get imported when Python
starts up? What's one more?

(3) If cheese.py truly is independent of package, then it shouldn't be part
of package. Just make it a stand alone module outside the package
directory, and be done. (Your installer can still treat cheese.py as a
dependency of package, and ensure that they are both installed.)



-- 
Steven



From rhodri at wildebst.demon.co.uk  Sat Sep 10 21:12:26 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 11 Sep 2011 02:12:26 +0100
Subject: optionparse: how to add a line break to the help text
References: <j4gi5r$gjc$1@dough.gmane.org>
	<mailman.952.1315693006.27778.python-list@python.org>
Message-ID: <op.v1mdm0oba8ncjz@gnudebst>

On Sat, 10 Sep 2011 23:16:42 +0100, Rafael Dur?n Casta?eda  
<rafadurancastaneda at gmail.com> wrote:

> On 10/09/11 22:43, Gelonida N wrote:
>> I'm having a small question about optionparse.
>>
>> Normaly optionparser will format the help text according to the
>> console's width.
>>
>> I just wondered if there is any way to insert a line breakk into an
>> options help text.
>>
>> Example:
>>
>> from optparse import OptionParser
>>
>> parser = OptionParser()
>> parser.add_option("-f", action="store",
>>      help="This option is really really complicated"
>>           " and I'd like to write"
>>           " a few paragrpahs to explain how it works."
>>           "\nHowever the line breaks are stripped off"
>>           " and it's thus difficult to structure the help text")
>>
>> args = ['-h']
>> parser.parse_args(args)
>>
>> Is there any trick to force a new paragraph/ line break before the word
>> 'However'?
>>
>>
>> Thanks in advance for suggestions.
>>
>>
> You can use """ for multiple line texts:
>  >>> text = \
> ... """fsdfsfsdfsdf
> ...     sfsdfsfsdf
> ... sdfsdf  s
> ...
> ... """
>  >>> text
> 'fsdfsfsdfsdf\n    sfsdfsfsdf\nsdfsdf  s\n\n'

Unfortunately the help text is formatted using textwrap, which presumes  
that the entire text is a single paragraph.  To get paragraphs in the help  
text, you'll need to write an IndentedHelpFormatter subclass that splits  
the text on "\n\n", textwraps the split string individually, then re-joins  
them.  _format_text() and format_option() look like the methods that would  
need replacing.

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


From gelonida at gmail.com  Sat Sep 10 21:54:57 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 03:54:57 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <op.v1mdm0oba8ncjz@gnudebst>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>
	<op.v1mdm0oba8ncjz@gnudebst>
Message-ID: <j4h4dh$60n$1@dough.gmane.org>

Hi James,

On 09/11/2011 03:12 AM, Rhodri James wrote:
> On Sat, 10 Sep 2011 23:16:42 +0100, Rafael Dur?n Casta?eda
> <rafadurancastaneda at gmail.com> wrote:
> 
>> On 10/09/11 22:43, Gelonida N wrote:
>>>
>>> from optparse import OptionParser
>>>
>>> parser = OptionParser()
>>> parser.add_option("-f", action="store",
>>>      help="This option is really really complicated"
>>>           " and I'd like to write"
>>>           " a few paragrpahs to explain how it works."
>>>           "\nHowever the line breaks are stripped off"
>>>           " and it's thus difficult to structure the help text")
>>>
>>> args = ['-h']
>>> parser.parse_args(args)
>>>
>>> Is there any trick to force a new paragraph/ line break before the word
>>> 'However'?
>>

> 
> Unfortunately the help text is formatted using textwrap, which presumes
> that the entire text is a single paragraph.  To get paragraphs in the
> help text, you'll need to write an IndentedHelpFormatter subclass that
> splits the text on "\n\n", textwraps the split string individually, then
> re-joins them.  _format_text() and format_option() look like the methods
> that would need replacing.
> 

Thanks a lot. Good to know, that there are options, though a little more
complicated than expected.

I'll live withou tthe line break for the time being and will deep dive
lateron, when I really want to insist on pragraphs within a help section.

I like the idea of '\n\n' as paragraph markes.
Long term this could probably even become an enhancement for  optparse
(with an explicit option to enable it in order to break no existing code)




From python.list at tim.thechases.com  Sat Sep 10 22:08:45 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sat, 10 Sep 2011 21:08:45 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <j4h4dh$60n$1@dough.gmane.org>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>
	<j4h4dh$60n$1@dough.gmane.org>
Message-ID: <4E6C182D.60905@tim.thechases.com>

On 09/10/11 20:54, Gelonida N wrote:
>> Unfortunately the help text is formatted using textwrap, which presumes
>> that the entire text is a single paragraph.  To get paragraphs in the
>> help text, you'll need to write an IndentedHelpFormatter subclass that
>> splits the text on "\n\n", textwraps the split string individually, then
>> re-joins them.  _format_text() and format_option() look like the methods
>> that would need replacing.
>
> Thanks a lot. Good to know, that there are options, though a little more
> complicated than expected.

Just in case you want it:

http://bytes.com/topic/python/answers/734066-how-output-newline-carriage-return-optparse

it's come up several times and several years ago I hacked 
together exactly the solution Rhodri mentions.

-tkc




From ting at thsu.org  Sat Sep 10 22:12:37 2011
From: ting at thsu.org (ting at thsu.org)
Date: Sat, 10 Sep 2011 19:12:37 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.933.1315655225.27778.python-list@python.org>
Message-ID: <bc13c81c-11f3-485b-ae17-f31ed6828be3@et6g2000vbb.googlegroups.com>

On Sep 10, 7:47?am, Peter Otten <__pete... at web.de> wrote:
> Tigerstyle wrote:
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> > This is the code:
>
> > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> > ? ? new_title = []
> > ? ? title_split = title.strip().lower().split()
> > ? ? for word in title_split:
> > ? ? ? ? if title_split[0] in small_words:
> > ? ? ? ? ? ? new_title.append(word.title())
> > ? ? ? ? elif word in small_words:
> > ? ? ? ? ? ? new_title.append(word.lower())
> > ? ? ? ? else:
> > ? ? ? ? ? ? new_title.append(word.title())
>
> The logic of the for-loop is flawed; the expression
>
> title_split[0] in small_words
>
> will always evaluate to True if the first word is a "small word", even when
> the loop is already past the first word. You can work around that with a
> flag along these lines
>
> first = True
> for word in title_split:
> ? ? if first:
> ? ? ? ? # special treatment for the first word
> ? ? ? ? first = False
> ? ? else:
> ? ? ? ? # put checks for all words but the first here
> ? ? new_title.append(fixed_word) # assuming you have stored the titlecased
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# or lowercased word in the fixed_word
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# variable

Another way to tackle this is to just capitalize the entire sentence
before returning it.

new_title = []
title_split = title.strip().lower().split()
for word in title_split:
  if word in small_words:
    new_title.append(word.lower())
  else:
    new_title.append(word.title())
return(''.join(new_title).capitalize())

However, I'm only helping with your homework, because I want to point
out that doctest comments should be *readable*. Don't just throw them
in, take the extra 10-15 seconds to make them easier on the eyes. In
the workplace, months will pass before you review this code again, so
you want to make it easier for an older version of yourself to
remember it.

And it takes very little effort to make it readable. Here's your
doctest string, reformatted with just a tiny bit more whitespace. I
even cut out a sentence.

def book_title(title):
  """
  All words EXCEPT for small words are made title case
  unless the string starts with a preposition, in which
  case the word is correctly capitalized.

  >>> book_title('DIVE Into python')
  'Dive into Python'
  >>> book_title('the great gatsby')
  'The Great Gatsby'
  >>> book_title('the WORKS OF AleXANDer dumas')
  'The Works of Alexander Dumas'
  """
--
// T.Hsu


From clp2 at rebertia.com  Sat Sep 10 22:18:47 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 10 Sep 2011 19:18:47 -0700
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <32440187.post@talk.nabble.com>
References: <32440187.post@talk.nabble.com>
Message-ID: <CAMZYqRSLbPz85KpEUH0QWiP=Jf-mUwjy8BGgOsj_mvFsFme_0g@mail.gmail.com>

On Sat, Sep 10, 2011 at 5:43 PM, Dr. Phillip M. Feldman
<Phillip.M.Feldman at gmail.com> wrote:
> I've written a recursive class that creates an iterator to solve a general
> formulation of the combinatorics problem known as "balls in numbered boxes"
> (also known as "indistinguishable balls in distinguishable boxes"). ?The
> code has been extensively tested and appears to work, but isn't terribly
> elegant. ?Any suggestions about how to improve it will be appreciated.

Significantly refactored (but untested) version:
https://gist.github.com/1209079

Cheers,
Chris
--
http://rebertia.com


From gelonida at gmail.com  Sat Sep 10 23:07:28 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 05:07:28 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <4E6C182D.60905@tim.thechases.com>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>	<j4h4dh$60n$1@dough.gmane.org>
	<4E6C182D.60905@tim.thechases.com>
Message-ID: <j4h8lh$qui$1@dough.gmane.org>

Hi Tim,


Thanks a lot!!!



On 09/11/2011 04:08 AM, Tim Chase wrote:
> On 09/10/11 20:54, Gelonida N wrote:
>>> Unfortunately the help text is formatted using textwrap, which presumes
>>> that the entire text is a single paragraph.  To get paragraphs in the
>>> help text, you'll need to write an IndentedHelpFormatter subclass that
>>> splits the text on "\n\n", textwraps the split string individually, then
>>> re-joins them.  _format_text() and format_option() look like the methods
>>> that would need replacing.
> 
> Just in case you want it:
> 
> http://bytes.com/topic/python/answers/734066-how-output-newline-carriage-return-optparse
> 

It works (of course ;-) ) like a charm.
Good to know, that I'm not the only one who want's to structure the help
text a little nicer.

> 
> it's come up several times and several years ago I hacked together
> exactly the solution Rhodri mentions.

Considering, that you posted the snippet in 2007 and this is very
probably a reocurring problem for any slighty more complicated help text
it is really a pity, that it did not become of part of the standard
optparse library :-(


Thanks again.




From jabba.laci at gmail.com  Sat Sep 10 23:20:26 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Sat, 10 Sep 2011 23:20:26 -0400
Subject: download pages using a cookies.txt file
In-Reply-To: <CAMZYqRTEnda-nidjk+uckAOCCx1e8q_kv2GN=8E9WxzSw10Uxg@mail.gmail.com>
References: <CAOuJsMkZk5+dGkn6bv1ESajPw+OnTWXEHR8eUrfb981D0bvffQ@mail.gmail.com>
	<CAMZYqRTEnda-nidjk+uckAOCCx1e8q_kv2GN=8E9WxzSw10Uxg@mail.gmail.com>
Message-ID: <CAOuJsMksi5iB6NVXWczWBOU1vNUuUHor+8==VjedyrrCDjJ3yA@mail.gmail.com>

Hi,

Thanks, I could put together the pieces and here is my solution:

(1) get_cookies_in_cookiejar function to extract cookies and put them
in a cookiejar:
https://github.com/jabbalaci/jabbapylib/blob/master/jabbapylib/web/export_firefox_cookies.py

(2) download page using urllib2 and passing the cookiejar:
https://github.com/jabbalaci/jabbapylib/blob/master/jabbapylib/web/web.py
See the bottom with get_page_with_cookies_using_cookiejar(url).

Laszlo


On Mon, Sep 5, 2011 at 22:19, Chris Rebert <clp2 at rebertia.com> wrote:
> On Mon, Sep 5, 2011 at 6:36 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
>> Hi,
>>
>> I would like to download a page that requires authentication with
>> cookies. I've already figured out how to do it with wget (blog post
>> here: http://bit.ly/pp25LP). In short:
>> (1) extract cookies from Firefox's cookies.sqlite and store them in a text file
>> (2) wget --cookies=on --load-cookies=cookies.txt
>> --keep-session-cookies "http://..."
>>
>> My question is: how to do it from Python?
>
> http://docs.python.org/library/cookielib.html#cookielib.MozillaCookieJar
>
> Cheers,
> Chris
>


From laurent.payot at gmail.com  Sat Sep 10 23:21:46 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 20:21:46 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <3c8c4056-aa89-4a7c-a22c-44baf97a02c1@glegroupsg2000goo.googlegroups.com>

Well PyPy is just an implementation of Python among many others (but limited to version 2.7). It is not a web server. If you want to make PyPy interact with a web server (such as nginx) you have to use a special protocol such as WSGI or Fast-CGI. For best performances you can for instance use uWSGI that integrates well with nginx but for this you have to recompile nginx. As you see it's a bit complex, you should read the wikis. May the Force be with you.


From laurent.payot at gmail.com  Sat Sep 10 23:21:46 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sat, 10 Sep 2011 20:21:46 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <3c8c4056-aa89-4a7c-a22c-44baf97a02c1@glegroupsg2000goo.googlegroups.com>

Well PyPy is just an implementation of Python among many others (but limited to version 2.7). It is not a web server. If you want to make PyPy interact with a web server (such as nginx) you have to use a special protocol such as WSGI or Fast-CGI. For best performances you can for instance use uWSGI that integrates well with nginx but for this you have to recompile nginx. As you see it's a bit complex, you should read the wikis. May the Force be with you.


From gelonida at gmail.com  Sat Sep 10 23:39:05 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 05:39:05 +0200
Subject: import packet.module without importing packet.__init__ ?
In-Reply-To: <4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.958.1315699526.27778.python-list@python.org>
	<4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4hagq$3jf$1@dough.gmane.org>

Hi Steven,

Thanks for your answer.

On 09/11/2011 02:56 AM, Steven D'Aprano wrote:
> Gelonida N wrote: 
>> Is it possible to import a module from a packet without importing its
>> __init__.py ?
> 
> Untested, but I think so. But you shouldn't. The solution (if it does work,
> as I said I haven't tested it) is a hack.
> 
> Suppose you have a library like this:
. . .
. . .
> The directory "modules" is in your Python path, so you can "import spam"
> or "import package". The trick is to add "modules/package" to the Python
> path so that "import cheese" will find cheese.py directly.
> 

Yes it's a hack, but good to know it exists. Just in case.

> Another hack would be to add a hard link to the top level:
> 

As you said: Hard links would be a little annoying on some file systems.

> 
> But generally, you should design your package so that it doesn't matter
> whether or not __init__.py is imported first. I see three reasnable
> situations:
> 
> (1) package.cheese should rely on package, in which case it requires
> package.__init__ to be imported first. (Sometimes I put code common to the
> entire package in __init__.py.)
> 
> (2) Just don't worry about the fact that package.__init__ gets imported
> first. Do you have any idea how many modules get imported when Python
> starts up? What's one more?
> 
> (3) If cheese.py truly is independent of package, then it shouldn't be part
> of package. Just make it a stand alone module outside the package
> directory, and be done. (Your installer can still treat cheese.py as a
> dependency of package, and ensure that they are both installed.)
> 


There's still something, that I am philosophycally missing.

Wy do I have to import the entire tree if I'm just interested in a leave.

this is not always desired.

let's imagine

kitchen.__init__
kitchen.knives
kitchen.pans
kitchen.pots


or alternatively
os
os.path
os.wheteverelse

Let's assume, that  kitchen/__init__.py is importing the sub modules
knives, pans and pots

then I understand of course, that the next lines would import the entire
kitchen

> import kitchen # will import all activities
> kitchen.pots.boil(egg)


But if I know that I just want to boil some eggs I would really
appreciate if I could just say

> from kitchen.pot import boil
> boil(eggs)
without having the side effect of getting pans and knives also loaded
into memory.

Moving pots out into a separate package doesn't really feel right.
I agree, that a 10 level deep package tree is not really desirable, but
having every package flat on the top level doesn't sound that good either.

So it seems, that developers of huge packages shouldn't really do a lot
in __init__.py.

Otherwise any user would always 'suck in' the entiry package with all
its sub modules.




To give more details about why I asked this question:

The real setup looks a little different and there are some issues, that
I am having:

One package in question is a huge django application.

Within the package is one module defining some constants and tiny
functions, which I would like to reuse from some command line tools,
which should start quickly without loading any of the django specific
modules. (the startup penalty and the memory overhead would be noticable)

I am using rpc4django, which expects, that __init__.py of the django
application exports some all rpc functions
which will basically import 95% of the django application and the entire
django frame work (none of which were required by my command tool,
support utility for this application)


I could of course create a separate package just for this tiny sub
module, but somehow it doesn't feel right to me.


The second issue is a little more complicated. basically I end up having
circular dependencies.

as I have two applications that  send a few customs django signals forth
an back.

If I wouldn't import __init__.py or if I moved the declaration of the
signals into a third package then circular dependencies would disappear.


So it seems, that if I can't avoid loading __init__.py in
a nice way I have to create  one or two tiny packages outside of my
django application,
or change the python path  as you proposed (increases of course name
space clashes)

or to find a way for rpc4django of loading / locating the rpc functions
without putting them  in __init__.py change the rpc functions such, that
they will only import the other sub modules when being called the first
time (proxies / delayed imports, . . .)





From rosuav at gmail.com  Sat Sep 10 23:53:44 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 11 Sep 2011 13:53:44 +1000
Subject: using python in web applications
In-Reply-To: <53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
Message-ID: <CAPTjJmrjJ26ofVrz6QFmvE7VkSpTjDdKEjmsLipExrouqHEYJg@mail.gmail.com>

On Sun, Sep 11, 2011 at 9:35 AM, Laurent <laurent.payot at gmail.com> wrote:
> [troll]
> For a serious web based MMO you'd rather stick to low level and forget about bloated Object Relational Mapping java-like layered kind of frameworks that are made for Rapid Applications Development, not for efficiency.
> [/troll]

I have been trolled. :)

For any sort of web-based real-time game, here's two things to avoid:

1) Snoopability and modifiability of crucial data. Everything should
be stored on the server, so that if anyone fiddles, all they do is
break their own client so it has to reload from the server.
2) Massive waste of resources due to unnecessary frameworks/facilities.

I play a lot of Flash games, and right now I'm playing one that has
coped poorly with a miniature slashdotting. A spike in popularity
resulted in a spike in server lag. I fired up a little packet sniffer,
and discovered that every time you do anything in the game, the client
makes a new POST request to its server. Why?! It's not that hard to
hold a socket connection open!

In another context, a similar issue - not a problem as yet (that I
know of), but would be if the system were to be slashdotted. A server
whose sole purpose is to handle script-instigated requests (using HTTP
POST for its transport) sends back a Set-Cookie header with a session
id. This implies that the server is holding session data for all these
clients that are never going to send that cookie back. The server
appears to be IIS with ASP scripts, so presumably stateful sessions
are enabled by default, so it's costing memory and processing to hold,
then discard, all those useless (and probably empty) session state
tags. And presumably many MANY other servers have the same thing.

What's YOUR framework doing that you don't need, and how much is it costing you?

Yeah, I was trolled bad. :)

ChrisA


From bluegene8210 at gmail.com  Sat Sep 10 23:54:01 2011
From: bluegene8210 at gmail.com (=?GB2312?B?wLbJq7v50vI=?=)
Date: Sat, 10 Sep 2011 20:54:01 -0700 (PDT)
Subject: Deadlock problem using multiprocessing
Message-ID: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>

This is my first touch on the multiprocessing module, and I admit not
having a deep understanding of parallel programming, forgive me if
there's any obvious error. This is my test code:

# deadlock.py

import multiprocessing

class MPTask:
	def __init__(self):
		self._tseq= range(10)	# task sequence
		self._pool= multiprocessing.Pool(2)	# process pool
	def _exe(self, num):
		return num**2
	def run(self):
		result= self._pool.map_async(self._exe, self._tseq)
		return result.get()

result= MPTask().run()
print(result)

And seemingly it creates a deadlock, I have to manually kill the
processes in the system monitor, yet it would be OK if the _exe()
function was defined outside the MPTask class:

# no_deadlock.py
import multiprocessing

def _exe(num):
	return num**2

class MPTask:
	def __init__(self):
		self._tseq= range(10)	# task sequence
		self._pool= multiprocessing.Pool(2)	# process pool
	def run(self):
		result= self._pool.map_async(_exe, self._tseq)
		return result.get()

result= MPTask().run()
print(result)

This would give the correct answer without any deadlock. My questions:

1. Why is this, where did the deadlock come from?

2. Besides, is there any material I can refer to about how to avoid
deadlocks when using multiple processes in the program?

Thanks!



From ian.g.kelly at gmail.com  Sun Sep 11 00:01:02 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 10 Sep 2011 22:01:02 -0600
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4gea4$m3b$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
Message-ID: <CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>

On Sat, Sep 10, 2011 at 1:36 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> The statement containing the explicit next(items) call can optionally be
> wrapped to explicitly handle the case of an empty iterable in whatever
> manner is desired.
>
> try:
> ? ?<set up with next(items)>
> except StopIteration:
> ? ?raise ValueError("iterable cannot be empty")

The only time that's optional is when you're writing an iterator and
the try-except would end up looking like this:

try:
    # do stuff with next(items)
except StopIteration:
    raise StopIteration

And even then, it's probably a good idea to clearly document that
you're allowing a StopIteration from one iterator to propagate up as a
StopIteration for another.

Apart from that case, whenever you call next() you should always be
prepared to catch a StopIteration.  Letting a StopIteration propagate
up the stack to parts unknown is bad juju because it's a flow control
exception, not an error-signaling exception.  If it happens to
propagate up to another for loop, then it will break out of the for
loop, and the exception will simply be swallowed.

Cheers,
Ian


From 1248283536 at qq.com  Sun Sep 11 00:46:43 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Sun, 11 Sep 2011 12:46:43 +0800
Subject: convert  time
Message-ID: <tencent_3E32FF310B29A4E4732AB698@qq.com>

how can i convert "Dec 11" into  2011-12?
-------------- next part --------------
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From steve+comp.lang.python at pearwood.info  Sun Sep 11 00:51:18 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 14:51:18 +1000
Subject: import packet.module without importing packet.__init__ ?
References: <mailman.958.1315699526.27778.python-list@python.org>
	<4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>
	<mailman.967.1315712363.27778.python-list@python.org>
Message-ID: <4e6c3e47$0$29999$c3e8da3$5496439d@news.astraweb.com>

Gelonida N wrote:


> There's still something, that I am philosophycally missing.
> 
> Wy do I have to import the entire tree if I'm just interested in a leave.

You don't. Python just imports the branches leading to the leaf, not the
entire tree.

[...]
> But if I know that I just want to boil some eggs I would really
> appreciate if I could just say
> 
>> from kitchen.pot import boil
>> boil(eggs)
> without having the side effect of getting pans and knives also loaded
> into memory.

In your example, you stated that kitchen explicitly imports kitchen.pans and
kitchen.knives. So in that case, take it up with the designer of the
kitchen package -- it was his decision to import them, just like he
imported re and math and httplib. (For example.) 

If kitchen is your package, then it is your choice: if you want to have
control over when sub-packages get imported, then don't automatically
import them in __init__.py. If you want them to be automatically imported,
like os and os.path, then automatically import them. If you don't, don't.

But note that you cannot expect to import kitchen.pot without importing
kitchen first.


> One package in question is a huge django application.
> 
> Within the package is one module defining some constants and tiny
> functions, which I would like to reuse from some command line tools,
> which should start quickly without loading any of the django specific
> modules. (the startup penalty and the memory overhead would be noticable)
> 
> I am using rpc4django, which expects, that __init__.py of the django
> application exports some all rpc functions
> which will basically import 95% of the django application and the entire
> django frame work (none of which were required by my command tool,
> support utility for this application)
> 
> 
> I could of course create a separate package just for this tiny sub
> module, but somehow it doesn't feel right to me.

Why should it be a package? Just make it a stand-alone module.

Or use path manipulation from your command line tool to import it on its
own. It might be somewhat of a hack, but if need to do it, do so.

Or do something like this:

my_app/
+--  __init__.py  # lightweight, nearly empty
+--  cmd_tools.py
+--  module1.py
+--  module2.py
+--  rpc/
     +-- __init__.py  # huge, imports my_app.module1, my_app.module2, etc.


then point rpc4django at my_app.rpc instead of my_app.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Sun Sep 11 01:00:55 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 15:00:55 +1000
Subject: convert  time
References: <mailman.970.1315716418.27778.python-list@python.org>
Message-ID: <4e6c4088$0$29965$c3e8da3$5496439d@news.astraweb.com>

???? wrote:

> how can i convert "Dec 11" into  2011-12?


if my_str == "Dec 11":
    return 1999  # 2011 - 12


Does that help?

But seriously... 2011-12 is not a proper date, so the simplest way is
probably something like this:

def convert(date_str):
    month, short_year = date_str.split()
    if len(short_year) == 4:
        year = short_year
    else:
        year = '20' + short_year
    months = 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec'.split()
    month = months.index(month) + 1
    return year + '-' + str(month)

Otherwise see the time and datetime modules:

http://docs.python.org/library/time.html
http://docs.python.org/library/datetime.html


-- 
Steven



From clp2 at rebertia.com  Sun Sep 11 01:02:37 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 10 Sep 2011 22:02:37 -0700
Subject: convert time
In-Reply-To: <tencent_3E32FF310B29A4E4732AB698@qq.com>
References: <tencent_3E32FF310B29A4E4732AB698@qq.com>
Message-ID: <CAMZYqRT-vXoY+Mia+kbh7Thg6NRjf-aa3-gdwVqS39cMvXR5aQ@mail.gmail.com>

2011/9/10 ???? <1248283536 at qq.com>:
> how can i convert "Dec 11" into? 2011-12?

Read the fine manuals for the `time` or `datetime` modules.
http://docs.python.org/library/datetime.html

>>> from datetime import datetime
>>> datetime.strptime("Dec 11", "%b %y")
datetime.datetime(2011, 12, 1, 0, 0)
>>> datetime.strptime("Dec 11", "%b %y").strftime("%Y-%m")
'2011-12'

Note that this code depends on an appropriate locale setting for
parsing the month name abbreviations.

Cheers,
Chris
--
http://rebertia.com


From steve+comp.lang.python at pearwood.info  Sun Sep 11 01:08:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 11 Sep 2011 15:08:00 +1000
Subject: killing a script
References: <4e6abc95$0$29995$c3e8da3$5496439d@news.astraweb.com>
	<mailman.928.1315644591.27778.python-list@python.org>
Message-ID: <4e6c4231$0$29996$c3e8da3$5496439d@news.astraweb.com>

Cameron Simpson wrote:

> On 10Sep2011 11:25, Steven D'Aprano <steve+comp.lang.python at pearwood.info>
> wrote:
> | Cameron Simpson wrote:
> | > My copy of the 2.7 docs says:
> | >   This is implemented by calling the Standard C function system(), and
> | >   has the same limitations.
> | > and sure enough, "man 3 system" says:
> | 
> | I don't consider having to look up documentation for a function in a
> | completely different language (in this case, C) as "documented behaviour
> | of os.system".
> 
> You're kidding, surely? 

No, I meant exactly what I said, but I suspect that you misunderstood what I
said. I blame myself for not making myself more clear, sorry.


> A wrapper function for a system supplied function 
> should recite everything about the wrapped function's behaviour (including
> the system dependent stuff) in the wrapper doco?

Heavens no, I certainly don't mean that. That would be silly. 

What I mean is that in the context of discussing Python library
functions, "documented behaviour" refers to what the Python docs state,
namely the function docstring and the docs at http://docs.python.org/ (or
the 3.x version). Third-party documentation doesn't count: not blogs,
not "some guy sent me an email", and not documentation for other tools
either.

So if you describe a feature of os.system as "documented", I'm going to
understand that as *Python* documentation. Hence my question about where it
is documented. If we're discussing external documentation, we should say so
up front: not all Python users are using CPython, and not all Python coders
know C and have access to the Linux man pages.


-- 
Steven



From ben+python at benfinney.id.au  Sun Sep 11 01:20:07 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 11 Sep 2011 15:20:07 +1000
Subject: optionparse: how to add a line break to the help text
References: <j4gi5r$gjc$1@dough.gmane.org>
	<mailman.952.1315693006.27778.python-list@python.org>
	<op.v1mdm0oba8ncjz@gnudebst> <j4h4dh$60n$1@dough.gmane.org>
	<4E6C182D.60905@tim.thechases.com>
	<mailman.964.1315710463.27778.python-list@python.org>
Message-ID: <87aaabmz94.fsf@benfinney.id.au>

Gelonida N <gelonida at gmail.com> writes:

> Considering, that you posted the snippet in 2007 and this is very
> probably a reocurring problem for any slighty more complicated help
> text it is really a pity, that it did not become of part of the
> standard optparse library :-(

The ?optparse? library is, as the online documentation shows
<URL:http://docs.python.org/library/optparse.html>, deprecated for new
code:

    The optparse module is deprecated and will not be developed further;
    development will continue with the argparse module.

The standard library ?argparse? module has a feature you might prefer
<URL:http://docs.python.org/library/argparse.html#formatter-class>.

-- 
 \      ?An expert is a man who has made all the mistakes which can be |
  `\                         made in a very narrow field.? ?Niels Bohr |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Sun Sep 11 01:30:18 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sun, 11 Sep 2011 15:30:18 +1000
Subject: convert  time
References: <mailman.970.1315716418.27778.python-list@python.org>
	<4e6c4088$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <8762kzmys5.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> But seriously... 2011-12 is not a proper date

It's valid by ISO 8601. The standard allows any number of parts to be
dropped, from least to most significant, in order to have a value with
deliberately reduced precision.

   <URL:https://secure.wikimedia.org/wikipedia/en/wiki/ISO_8601#General_principles>

> Otherwise see the time and datetime modules:

    >>> import datetime
    >>> text = "2011-12"
    >>> datetime.datetime.strptime(text, "%Y-%m")
    datetime.datetime(2011, 12, 1, 0, 0)

-- 
 \            ?It's not what you pay a man, but what he costs you that |
  `\                                             counts.? ?Will Rogers |
_o__)                                                                  |
Ben Finney


From dreyemi at gmail.com  Sun Sep 11 04:18:29 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 11 Sep 2011 09:18:29 +0100
Subject: Invoke a superclass method from a subclass constructor
Message-ID: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>

Hello friends,

An instance of my subclass doesn't invoke its superclass method, except when
it is referenced
directly.

Here is what I mean:

>>> class A(object):
...     def log(self, module):
...             return str('logged')
...

>>> class B(A):
...     def __init__(self, module):
...             self.module = A().log(module)
...
>>> c = B('system')
>>> # I expect 'logged' to be printed here
>>> print c.log('system') # why do I have to do this?
>>> 'logged'

Why do I have to make a call to c.log before log() method can be invoked?

My reasoning is such that since I have passed the log() method to B's
constructor, an instance
of B should invoke A's log() method.

What could I be missing in class A or B to have this working as expected?
-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From t at jollybox.de  Sun Sep 11 06:41:08 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sun, 11 Sep 2011 12:41:08 +0200
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
Message-ID: <4E6C9044.5060302@jollybox.de>

On 11/09/11 10:18, Kayode Odeyemi wrote:
> Hello friends,
> 
> An instance of my subclass doesn't invoke its superclass method, except
> when it is referenced
> directly. 
> 
> Here is what I mean:
> 
>>>> class A(object):
> ...     def log(self, module):
> ...             return str('logged')
> ...
> 
>>>> class B(A):
> ...     def __init__(self, module):
> ...             self.module = A().log(module)
> ...
>>>> c = B('system')
>>>> # I expect 'logged' to be printed here
>>>> print c.log('system') # why do I have to do this?
>>>> 'logged'
> 
> Why do I have to make a call to c.log before log() method can be invoked?
> 
> My reasoning is such that since I have passed the log() method to B's
> constructor, an instance
> of B should invoke A's log() method.
> 
> What could I be missing in class A or B to have this working as expected?

It is working:

>>> class A(object):
...     def log (self, module):
...         return str ('logged')
...
>>> class B(A):
...     def __init__(self, module):
...         self.module = A().log(module)
...
>>> c = B('system')
>>> c.module
'logged'

In B's constructor, you create a new instance of A (a pointless
excersise - you already have an instance of A, "self"), call its log()
method, and store the return value of that method in the attribute "module".

This is how you'd usually call a superclass's method:

>>> class B2(A):
...     def __init__(self, module):
...         # This is the way to call a superclass method:
...         self.log (module)
...
>>> c2 = B2 ('system')
>>>

That's what inheritance is. If B is derived from A, any B *is* also an A.

Now, something that might be closer to what you're actually heading for,
to think about. Please note that I'm using Python 3: explicitly deriving
a class from object is no longer necessary, and the "super" function is
now simpler. If you want to use Python 2, I'll leave looking up how to
use its "super" function as an excersise to the reader.

>>> class ModuleLogger:
...     def __init__(self, module):
...         self.module = module
...         print ('module logged: {0}'.format (module))
...
>>> class Foo (ModuleLogger):
...     def __init__(self, module):
...         # calling a superclass constructor here, in Python 3 syntax:
...         super().__init__(module)
...
>>> f = Foo ('system')
module logged: system
>>>

Using super() is always necessary when calling a superclass' method that
is also implemented in the subclass - self.__init__ would just invoke
the Foo constructor, you need super() to get to the ModuleLogger
constructor.

 - Thomas


From python.list at tim.thechases.com  Sun Sep 11 07:05:56 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 11 Sep 2011 06:05:56 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <j4h8lh$qui$1@dough.gmane.org>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>	<j4h4dh$60n$1@dough.gmane.org>	<4E6C182D.60905@tim.thechases.com>
	<j4h8lh$qui$1@dough.gmane.org>
Message-ID: <4E6C9614.60406@tim.thechases.com>

On 09/10/11 22:07, Gelonida N wrote:
>> http://bytes.com/topic/python/answers/734066-how-output-newline-carriage-return-optparse
>
> It works (of course ;-) ) like a charm. Good to know, that I'm
> not the only one who want's to structure the help text a
> little nicer.
>
> Considering, that you posted the snippet in 2007 and this is
> very probably a reocurring problem for any slighty more
> complicated help text it is really a pity, that it did not
> become of part of the standard optparse library :-(

Even at the time, the optparse library wasn't readily patchable 
as the inline documentation gave some dire warning about "don't 
edit this directly, as this file is generated from some other 
source"?I never was able to dig up that source to patch against.

As Ben Finney replied, optparse is now deprecated, replaced in 
part by argparse. Unfortunately, argparse wasn't backported to 
the standard library for earlier 2.x series (I think it became 
available in 2.7, and may run in earlier versions if manually 
added like I had to do on my Debian Py2.6 install). But that 
makes it hard for those of us who want to use a built-in 
option-parsing library across a wide variety of Python versions. 
  I don't strongly care which I use except that I want it to be 
broadly available with minimal fuss.

-tkc




From dreyemi at gmail.com  Sun Sep 11 07:17:27 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 11 Sep 2011 12:17:27 +0100
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <4E6C9044.5060302@jollybox.de>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
Message-ID: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>

On Sun, Sep 11, 2011 at 11:41 AM, Thomas Jollans <t at jollybox.de> wrote:

> On 11/09/11 10:18, Kayode Odeyemi wrote:
> > Hello friends,
> >
> > An instance of my subclass doesn't invoke its superclass method, except
> > when it is referenced
> > directly.
> >
> > Here is what I mean:
> >
> >>>> class A(object):
> > ...     def log(self, module):
> > ...             return str('logged')
> > ...
> >
> >>>> class B(A):
> > ...     def __init__(self, module):
> > ...             self.module = A().log(module)
> > ...
> >>>> c = B('system')
> >>>> # I expect 'logged' to be printed here
> >>>> print c.log('system') # why do I have to do this?
> >>>> 'logged'
> >
> > Why do I have to make a call to c.log before log() method can be invoked?
> >
> > My reasoning is such that since I have passed the log() method to B's
> > constructor, an instance
> > of B should invoke A's log() method.
> >
> > What could I be missing in class A or B to have this working as expected?
>
> It is working:
>
> >>> class A(object):
> ...     def log (self, module):
> ...         return str ('logged')
> ...
> >>> class B(A):
> ...     def __init__(self, module):
> ...         self.module = A().log(module)
> ...
> >>> c = B('system')
> >>> c.module
> 'logged'
>
> Why do you have to do c.module? I'm expecting an output just by creating an
instance of B.
Could this be a limitation in Py2+?


> In B's constructor, you create a new instance of A (a pointless
> excersise - you already have an instance of A, "self"), call its log()
> method, and store the return value of that method in the attribute
> "module".
>
> This is how you'd usually call a superclass's method:
>
> >>> class B2(A):
> ...     def __init__(self, module):
> ...         # This is the way to call a superclass method:
> ...         self.log (module)
> ...
> >>> c2 = B2 ('system')
> >>>
>
> That's what inheritance is. If B is derived from A, any B *is* also an A.
>
> Now, something that might be closer to what you're actually heading for,
> to think about. Please note that I'm using Python 3: explicitly deriving
> a class from object is no longer necessary, and the "super" function is
> now simpler. If you want to use Python 2, I'll leave looking up how to
> use its "super" function as an excersise to the reader.
>
> >>> class ModuleLogger:
> ...     def __init__(self, module):
> ...         self.module = module
> ...         print ('module logged: {0}'.format (module))
> ...
> >>> class Foo (ModuleLogger):
> ...     def __init__(self, module):
> ...         # calling a superclass constructor here, in Python 3 syntax:
> ...         super().__init__(module)
> ...
> >>> f = Foo ('system')
> module logged: system
> >>>
>
> I'm on Py2.7.

class ModuleLogger is not the same as class A (the one I'm using as an
example). I need the log()
method to be an instance of class A. I don't want it declared in class A
constructor because I don't
want to have access to it when class A is instantiated.

Using super() is always necessary when calling a superclass' method that
> is also implemented in the subclass - self.__init__ would just invoke
> the Foo constructor, you need super() to get to the ModuleLogger
> constructor.
>

Well, I did try using super(), but I got this:
>>> class B(A):
...     def __init__(self, module):
...             super(A, self).log('system')
...
>>> c = B('module')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __init__
AttributeError: 'super' object has no attribute 'log'

I hope a reader on Py2+ can help with this.

>
>  - Thomas
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From kushal.kumaran+python at gmail.com  Sun Sep 11 07:32:18 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Sun, 11 Sep 2011 17:02:18 +0530
Subject: Deadlock problem using multiprocessing
In-Reply-To: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>
References: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>
Message-ID: <CAH8GtdPAxbXGLdpbP+fXm+CvmkpmWVmxSHCvrCdi+Sn0J4O96g@mail.gmail.com>

2011/9/11 ???? <bluegene8210 at gmail.com>:
> This is my first touch on the multiprocessing module, and I admit not
> having a deep understanding of parallel programming, forgive me if
> there's any obvious error. This is my test code:
>
> # deadlock.py
>
> import multiprocessing
>
> class MPTask:
> ? ? ? ?def __init__(self):
> ? ? ? ? ? ? ? ?self._tseq= range(10) ? # task sequence
> ? ? ? ? ? ? ? ?self._pool= multiprocessing.Pool(2) ? ? # process pool
> ? ? ? ?def _exe(self, num):
> ? ? ? ? ? ? ? ?return num**2
> ? ? ? ?def run(self):
> ? ? ? ? ? ? ? ?result= self._pool.map_async(self._exe, self._tseq)
> ? ? ? ? ? ? ? ?return result.get()
>
> result= MPTask().run()
> print(result)
>
> And seemingly it creates a deadlock, I have to manually kill the
> processes in the system monitor, yet it would be OK if the _exe()
> function was defined outside the MPTask class:
>
> # no_deadlock.py
> import multiprocessing
>
> def _exe(num):
> ? ? ? ?return num**2
>
> class MPTask:
> ? ? ? ?def __init__(self):
> ? ? ? ? ? ? ? ?self._tseq= range(10) ? # task sequence
> ? ? ? ? ? ? ? ?self._pool= multiprocessing.Pool(2) ? ? # process pool
> ? ? ? ?def run(self):
> ? ? ? ? ? ? ? ?result= self._pool.map_async(_exe, self._tseq)
> ? ? ? ? ? ? ? ?return result.get()
>
> result= MPTask().run()
> print(result)
>
> This would give the correct answer without any deadlock. My questions:
>
> 1. Why is this, where did the deadlock come from?
>
> 2. Besides, is there any material I can refer to about how to avoid
> deadlocks when using multiple processes in the program?
>

I get this exception when I run the first program:

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.1/threading.py", line 469, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.1/multiprocessing/pool.py", line 231, in _handle_tasks
    put(task)
  File "/usr/lib/python3.1/pickle.py", line 1349, in dumps
    Pickler(f, protocol, fix_imports=fix_imports).dump(obj)
_pickle.PicklingError: Can't pickle <class 'method'>: attribute lookup
builtins.method failed

There is no deadlock.  You are hitting this problem:
http://stackoverflow.com/questions/1816958/cant-pickle-type-instancemethod-when-using-pythons-multiprocessing-pool-map

-- 
regards,
kushal


From t at jollybox.de  Sun Sep 11 07:32:52 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sun, 11 Sep 2011 13:32:52 +0200
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
Message-ID: <4E6C9C64.3030704@jollybox.de>

On 11/09/11 13:17, Kayode Odeyemi wrote:
> On Sun, Sep 11, 2011 at 11:41 AM, Thomas Jollans <t at jollybox.de
> <mailto:t at jollybox.de>> wrote:
> 
>     It is working:
> 
>     >>> class A(object):
>     ...     def log (self, module):
>     ...         return str ('logged')
>     ...
>     >>> class B(A):
>     ...     def __init__(self, module):
>     ...         self.module = A().log(module)
>     ...
>     >>> c = B('system')
>     >>> c.module
>     'logged'
> 
> Why do you have to do c.module? I'm expecting an output just by creating
> an instance of B.
> Could this be a limitation in Py2+?
>  

I believe I already answered that question. You quoted my answer
directly below your question:

> 
>     In B's constructor, you create a new instance of A (a pointless
>     excersise - you already have an instance of A, "self"), call its log()
>     method, and store the return value of that method in the attribute
>     "module".
> 
>     This is how you'd usually call a superclass's method:
> 
>     >>> class B2(A):
>     ...     def __init__(self, module):
>     ...         # This is the way to call a superclass method:
>     ...         self.log (module)
>     ...
>     >>> c2 = B2 ('system')
>     >>>
> 
>     That's what inheritance is. If B is derived from A, any B *is* also
>     an A.
> 
>     Now, something that might be closer to what you're actually heading for,
>     to think about. Please note that I'm using Python 3: explicitly deriving
>     a class from object is no longer necessary, and the "super" function is
>     now simpler. If you want to use Python 2, I'll leave looking up how to
>     use its "super" function as an excersise to the reader.
> 
>     >>> class ModuleLogger:
>     ...     def __init__(self, module):
>     ...         self.module = module
>     ...         print ('module logged: {0}'.format (module))
>     ...
>     >>> class Foo (ModuleLogger):
>     ...     def __init__(self, module):
>     ...         # calling a superclass constructor here, in Python 3 syntax:
>     ...         super().__init__(module)
>     ...
>     >>> f = Foo ('system')
>     module logged: system
>     >>>
> 
> I'm on Py2.7.
> 
> class ModuleLogger is not the same as class A (the one I'm using as an
> example). I need the log()
> method to be an instance of class A. I don't want it declared in class A
> constructor because I don't
> want to have access to it when class A is instantiated.

Then do it differently. I was merely offering an example that I hoped
might help you acheive your goals.

> 
>     Using super() is always necessary when calling a superclass' method that
>     is also implemented in the subclass - self.__init__ would just invoke
>     the Foo constructor, you need super() to get to the ModuleLogger
>     constructor.
> 
> 
> Well, I did try using super(), but I got this: 
>>>> class B(A):
> ...     def __init__(self, module):
> ...             super(A, self).log('system')
> ...
>>>> c = B('module')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 3, in __init__
> AttributeError: 'super' object has no attribute 'log'
> 
> I hope a reader on Py2+ can help with this.

If you'd read my previous response carefully, you'd know that in this
case, you don't need super(), and you'd also know how to use the
superclass' method.




From laddosingh at gmail.com  Sun Sep 11 07:46:38 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 04:46:38 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.943.1315677614.27778.python-list@python.org>
Message-ID: <fceb391d-8ac5-4eef-b89e-72c7327fc266@o26g2000vbi.googlegroups.com>

On 10 Sep, 19:59, Terry Reedy <tjre... at udel.edu> wrote:
> On 9/10/2011 7:20 AM, Tigerstyle wrote:
>
> > Hi guys.
>
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> We appreciate you saying so instead of hiding that this is homework.
>
>
>
>
>
>
>
>
>
> > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>
> > def book_title(title):
> > ? ? ?""" Takes a string and returns a title-case string.
> > ? ? ?All words EXCEPT for small words are made title case
> > ? ? ?unless the string starts with a preposition, in which
> > ? ? ?case the word is correctly capitalized.
> > ? ? ?>>> ?book_title('DIVE Into python')
> > ? ? ?'Dive into Python'
> > ? ? ?>>> ?book_title('the great gatsby')
> > ? ? ?'The Great Gatsby'
> > ? ? ?>>> ?book_title('the WORKS OF AleXANDer dumas')
> > ? ? ?'The Works of Alexander Dumas'
> > ? ? ?"""
> > ? ? ?new_title = []
> > ? ? ?title_split = title.strip().lower().split()
> > ? ? ?for word in title_split:
> > ? ? ? ? ?if title_split[0] in small_words:
> > ? ? ? ? ? ? ?new_title.append(word.title())
> > ? ? ? ? ?elif word in small_words:
> > ? ? ? ? ? ? ?new_title.append(word.lower())
> > ? ? ? ? ?else:
> > ? ? ? ? ? ? ?new_title.append(word.title())
>
> The key issue is that you want to treat the first word one way (.title
> it) and the rest differently (conditionally .title or not) . So
> immediately separate the first from the rest and then process each.
> There are at least three ways to do the split. Perhaps I should stop
> with this hint, and certainly you should think a bit before reading
> further, but here is what I consider to be the most elegant 3.2 code.
> .
> ,
> ,
> ,
> .
> .
> .
> ? ? ?first, *rest = title.strip().lower().split()
> ? ? ?new_title = [first.title()]
> ? ? ?for word in rest:
> ? ? ? ? ?if word not in small_words:
> ? ? ? ? ? ? ?word = word.title()
> ? ? ? ? ?new_title.append(word)
>
> > ? ? ?return(' '.join(new_title))
>
> doctest.testmod() now passes (there is no 'refactory' here)
>
> > def _test():
> > ? ? ?import doctest, refactory
> > ? ? ?return doctest.testmod(refactory)
> > if __name__ == "__main__":
> > ? ? ?_test()
>
> --
> Terry Jan Reedy

Thank you Terry,

I went for this solution as it was the easiest for me to understand
and comment myself keeping in mind what level I am at right now.
Thanks a ton to everyone for sharing so much information and making it
easy to read and understand your thoughts. This was surely very very
educating read the replies from so many talented people.

Thanks and looking forward to hanging around here more :)

T


From davea at ieee.org  Sun Sep 11 07:55:31 2011
From: davea at ieee.org (Dave Angel)
Date: Sun, 11 Sep 2011 07:55:31 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
Message-ID: <4E6CA1B3.2060503@ieee.org>

On 01/-10/-28163 02:59 PM, Kayode Odeyemi wrote:
> Hello friends,
>
> An instance of my subclass doesn't invoke its superclass method, except when
> it is referenced
> directly.
>
> Here is what I mean:
>
>>>> class A(object):
> ...     def log(self, module):
> ...             return str('logged')
> ...
>
>>>> class B(A):
> ...     def __init__(self, module):
> ...             self.module = A().log(module)
> ...
>>>> c = B('system')
>>>> # I expect 'logged' to be printed here
>>>> print c.log('system') # why do I have to do this?
>>>> 'logged'
> Why do I have to make a call to c.log before log() method can be invoked?
>
> My reasoning is such that since I have passed the log() method to B's
> constructor, an instance
> of B should invoke A's log() method.
>
> What could I be missing in class A or B to have this working as expected?
What makes you think that A.log() was not invoked???

You have no print statement, so you can't tell that way.  All the method 
does is to modify a temporary object of type A, so you can't tell that way.

Perhaps you mean to write
       self.module = A.log(self, module)

So that the return value could do some good.

DaveA



From python.list at tim.thechases.com  Sun Sep 11 08:41:58 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 11 Sep 2011 07:41:58 -0500
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4gea4$m3b$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
Message-ID: <4E6CAC96.9000304@tim.thechases.com>

On 09/10/11 14:36, Terry Reedy wrote:
> 1. Process first item of an iterable separately.
>
> A traditional solution is a flag variable that is tested for each item.
>
> first = True
> <other setup>
> for item in iterable:
>     if first:
>       <process first>
>       first = False
>     else:
>       <process non-first>
>
> (I have seen code like this posted on this list several times, including
> today.)
>
> Better, to me, is to remove the first item *before* the loop.
>
> items = iter(iterable)
> <set up with next(items)
> for item in items:
>     <process non-first>

I like to use this one for processing CSV files where I need to 
clean up the headers:

   r = csv.reader(f)
   headers = r.next()
   header_map = dict(
     (header.strip().upper(), i)
     for i, header
     in enumerate(headers)
     )
   for row in r:
     item = lambda s: row[header_map[s]].strip()
     thing = item("THING")
     whatever = item("WHATEVER")

It's mostly like a DictReader, but it isn't as sensitive to the 
spaces/capitalization that clients love to mess with.

-tkc





From __peter__ at web.de  Sun Sep 11 08:48:41 2011
From: __peter__ at web.de (Peter Otten)
Date: Sun, 11 Sep 2011 14:48:41 +0200
Subject: recursive algorithm for balls in numbered boxes
References: <32440187.post@talk.nabble.com>
Message-ID: <j4iamn$ave$1@dough.gmane.org>

Dr. Phillip M. Feldman wrote:

> I've written a recursive class that creates an iterator to solve a general
> formulation of the combinatorics problem known as "balls in numbered
> boxes"
> (also known as "indistinguishable balls in distinguishable boxes").  The
> code has been extensively tested and appears to work, but isn't terribly
> elegant.  Any suggestions about how to improve it will be appreciated.
 

Does the following do what you want?

>>> from itertools import product
>>> def binb(balls, boxsizes):
...     return (fill for fill in product(*[range(bs+1) for bs in boxsizes]) 
if sum(fill) == balls)
...
>>> for item in binb(10, [4, 3, 2, 1, 2]):
...     print item
...
(2, 3, 2, 1, 2)
(3, 2, 2, 1, 2)
(3, 3, 1, 1, 2)
(3, 3, 2, 0, 2)
(3, 3, 2, 1, 1)
(4, 1, 2, 1, 2)
(4, 2, 1, 1, 2)
(4, 2, 2, 0, 2)
(4, 2, 2, 1, 1)
(4, 3, 0, 1, 2)
(4, 3, 1, 0, 2)
(4, 3, 1, 1, 1)
(4, 3, 2, 0, 1)
(4, 3, 2, 1, 0)

If so, your implementation misses a few configurations:

>>> from balls_in_numbered_boxes import balls_in_numbered_boxes as bb
>>> for item in bb(10, [4, 3, 2, 1, 2]):
...     print item
...
[4 3 2 1 0]
[3 3 2 1 1]
[2 3 2 1 2]

> Also, I'd like to get this functionality into the Python's `itertools`
> module (the present set of combinatorics functions in `itertools` does not
> include "balls in boxes").  Does anyone know whom I should contact about
> this?

Basically you have to convince Raymond Hettinger. I recommend that you post 
your suggestion on python-ideas for a general discussion rather than 
approaching him directly.




From __peter__ at web.de  Sun Sep 11 09:41:23 2011
From: __peter__ at web.de (Peter Otten)
Date: Sun, 11 Sep 2011 15:41:23 +0200
Subject: Idioms combining 'next(items)' and 'for item in items:'
References: <j4gea4$m3b$1@dough.gmane.org>
Message-ID: <j4idpg$t29$1@dough.gmane.org>

Terry Reedy wrote:

> 3. Process the items of an iterable in pairs.
> 
> items = iter(iterable)
> for first in items:
>      second = next(items)
>      <process first and second>
> 
> This time, StopIteration is raised for an odd number of items. Catch and 
> process as desired. One possibility is to raise ValueError("Iterable 
> must have an even number of items").
 
Another way is zip-based iteration:

(a) silently drop the odd item

items = iter(iterable)
for first, second in zip(items, items): # itertools.izip in 2.x
   ...

(b) add a fill value

for first, second in itertools.zip_longest(items, items):
    ...

(c) raise an exception

Unfortunately there is no zip_exc() that guarantees that all iterables are 
of the same "length", but I've written a recipe some time ago

http://code.activestate.com/recipes/497006-zip_exc-a-lazy-zip-that-ensures-
that-all-iterables/

that achieves near-C speed.



From gelonida at gmail.com  Sun Sep 11 10:17:56 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 16:17:56 +0200
Subject: import packet.module without importing packet.__init__ ?
In-Reply-To: <4e6c3e47$0$29999$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.958.1315699526.27778.python-list@python.org>	<4e6c074c$0$29990$c3e8da3$5496439d@news.astraweb.com>	<mailman.967.1315712363.27778.python-list@python.org>
	<4e6c3e47$0$29999$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j4ifuk$aci$1@dough.gmane.org>

Hi Steven,

Thanks again for your answer.


On 09/11/2011 06:51 AM, Steven D'Aprano wrote:
> Gelonida N wrote:

> 
> In your example, you stated that kitchen explicitly imports kitchen.pans and
> kitchen.knives. So in that case, take it up with the designer of the
> kitchen package -- it was his decision to import them, just like he
> imported re and math and httplib. (For example.) 

Exactly. Thus my conclusion, that too many imports (just for commodity)
in __init__.py might not be such a good idea if one wants to allow
leaf-only imports.
> 
> If kitchen is your package, then it is your choice: if you want to have
> control over when sub-packages get imported, then don't automatically
> import them in __init__.py. 

Agreed. This is however my problem: Up to my understanding rpc4django
insists on putting code into __init__.py

> 
> 
>> One package in question is a huge django application.
>>
>> Within the package is one module defining some constants and tiny
>> functions, which I would like to reuse from some command line tools,
>> which should start quickly without loading any of the django specific
>> modules. (the startup penalty and the memory overhead would be noticable)
>>
>> I am using rpc4django, which expects, that __init__.py of the django
>> application exports some all rpc functions
>> which will basically import 95% of the django application and the entire
>> django frame work (none of which were required by my command tool,
>> support utility for this application)
>>
>>
>> I could of course create a separate package just for this tiny sub
>> module, but somehow it doesn't feel right to me.
> 
> Why should it be a package? Just make it a stand-alone module.

True

> Or do something like this:
> 
> my_app/
> +--  __init__.py  # lightweight, nearly empty
> +--  cmd_tools.py
> +--  module1.py
> +--  module2.py
> +--  rpc/
>      +-- __init__.py  # huge, imports my_app.module1, my_app.module2, etc.
> 
> then point rpc4django at my_app.rpc instead of my_app.
> 

Up to my knowledge rpc4django just imports all __inits__ of all django
applications to find look for functions with a certain decorator.

I'm not sure, whether django allows nested appllications, but this might
be a solution.




From gelonida at gmail.com  Sun Sep 11 10:30:07 2011
From: gelonida at gmail.com (Gelonida N)
Date: Sun, 11 Sep 2011 16:30:07 +0200
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <87aaabmz94.fsf@benfinney.id.au>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>
	<j4h4dh$60n$1@dough.gmane.org>	<4E6C182D.60905@tim.thechases.com>	<mailman.964.1315710463.27778.python-list@python.org>
	<87aaabmz94.fsf@benfinney.id.au>
Message-ID: <j4iglg$e9f$1@dough.gmane.org>

Thanks Ben,

On 09/11/2011 07:20 AM, Ben Finney wrote:
> Gelonida N <gelonida at gmail.com> writes:
> 
>> Considering, that you posted the snippet in 2007 and this is very
>> probably a reocurring problem for any slighty more complicated help
>> text it is really a pity, that it did not become of part of the
>> standard optparse library :-(
> 
> The ?optparse? library is, as the online documentation shows
> <URL:http://docs.python.org/library/optparse.html>, deprecated for new
> code:
> 
>     The optparse module is deprecated and will not be developed further;
>     development will continue with the argparse module.

This explains the reluctance to fix optparse. In 2007 however python 2.7
wasn't really that common though
> 
> The standard library ?argparse? module has a feature you might prefer
> <URL:http://docs.python.org/library/argparse.html#formatter-class>.

Most of my code has to run on python 2.5 / 2.6.

I just checked, that argparse can be installed (pip install argparse)
(didn't check functionality though) for python 2.5 / 2.6

So depending on the situation I had to decide whether I oblige users of
my scripts to  install argparse or whether I stick with optparse and
just add Tim's custom formatter.

Probably I'll go for optparse and Tim's custom formatter for tiny
scripts with no dependencies except standard libraries and
for  argparse for new bigger projects with external module dependencies.








From mdickinson at enthought.com  Sun Sep 11 11:08:17 2011
From: mdickinson at enthought.com (Mark Dickinson)
Date: Sun, 11 Sep 2011 08:08:17 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
References: <mailman.959.1315701829.27778.python-list@python.org>
Message-ID: <a3b7c177-944c-4d86-9329-0a88fd410c67@y21g2000yqk.googlegroups.com>

On Sep 11, 1:43?am, "Dr. Phillip M. Feldman"
<Phillip.M.Feld... at gmail.com> wrote:
> I've written a recursive class that creates an iterator to solve a general
> formulation of the combinatorics problem known as "balls in numbered boxes"
> (also known as "indistinguishable balls in distinguishable boxes"). ?The
> code has been extensively tested and appears to work, but isn't terribly
> elegant. ?Any suggestions about how to improve it will be appreciated.
>
> Also, I'd like to get this functionality into the Python's `itertools`
> module (the present set of combinatorics functions in `itertools` does not
> include "balls in boxes"). ?Does anyone know whom I should contact about
> this?

Note that for the version without size limits on individual boxes, the
itertools.combination function already provides most of what's
needed.  For example:

    import itertools

    def balls_in_boxes(nballs, nboxes):
        n, k = nballs + nboxes - 1, nboxes - 1
        for comb in itertools.combinations(range(n), k):
            yield [y - x - 1 for y, x in zip(comb + (n,), (-1,) +
comb)]

    print "5 balls in 3 boxes"
    for combination in balls_in_boxes(5, 3):
        print combination
        assert len(combination) == 3
        assert sum(combination) == 5


This is a well-known trick:  to divide 5 (unlabeled) balls amongst 3
(labeled) boxes, you write down sequences of 5 o's and 2 x's, where
the o's represent the 5 balls and the 'x's represent dividers:

    ooxooxo  -> [2, 2, 1]
    xoooxoo  -> [0, 3, 2]

And 'combinations(7, 2)' yields successively all the possible
different placements for the 2 dividers in the 7 symbols.


This question seems to come up often enough (without the box size
limit twist) that maybe it would be useful to include something like
this recipe in the itertool documentation.


For getting this into itertools, I'd suggest opening a feature request
on bugs.python.org and assigning it to Raymond Hettinger.

--
Mark


From bluegene8210 at gmail.com  Sun Sep 11 11:46:40 2011
From: bluegene8210 at gmail.com (Jacky Liu)
Date: Sun, 11 Sep 2011 08:46:40 -0700 (PDT)
Subject: Deadlock problem using multiprocessing
References: <5ccb9d98-f3f8-4f86-b53c-cda4522b40fc@14g2000prv.googlegroups.com>
	<mailman.981.1315740760.27778.python-list@python.org>
Message-ID: <b40429ce-3632-4540-aa29-79b99c41aa27@a10g2000prn.googlegroups.com>

>
> I get this exception when I run the first program:
>
> Exception in thread Thread-1:
> Traceback (most recent call last):
> ? File "/usr/lib/python3.1/threading.py", line 516, in _bootstrap_inner
> ? ? self.run()
> ? File "/usr/lib/python3.1/threading.py", line 469, in run
> ? ? self._target(*self._args, **self._kwargs)
> ? File "/usr/lib/python3.1/multiprocessing/pool.py", line 231, in _handle_tasks
> ? ? put(task)
> ? File "/usr/lib/python3.1/pickle.py", line 1349, in dumps
> ? ? Pickler(f, protocol, fix_imports=fix_imports).dump(obj)
> _pickle.PicklingError: Can't pickle <class 'method'>: attribute lookup
> builtins.method failed
>
> There is no deadlock. ?You are hitting this problem:http://stackoverflow.com/questions/1816958/cant-pickle-type-instancem...
>
> --
> regards,
> kushal


You're right. I just realized that I was running the program through
my Vim plug-in which would use the subprocess module to open the
process, wait for its termination and get the output. It seems that
multi-process program would act quite differently such that my Vim
plug-in had been halted without getting any error information, so I
was to falsely take it as a deadlock.

The thread in stackoverflow you referenced is great, now I'm trying to
fit the solution in my own program, thanks a lot!


From laddosingh at gmail.com  Sun Sep 11 12:36:25 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:36:25 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4fihi$5ao$1@speranza.aioe.org>
Message-ID: <e86efe59-25ee-48d4-a201-4a67053a51c2@bl1g2000vbb.googlegroups.com>

On 10 Sep, 13:43, Mel <mwil... at the-wire.com> wrote:
> Tigerstyle wrote:
> > Hi guys.
>
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> > This is the code:
>
> > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>
> > def book_title(title):
> > ? ? """ Takes a string and returns a title-case string.
> > ? ? All words EXCEPT for small words are made title case
> > ? ? unless the string starts with a preposition, in which
> > ? ? case the word is correctly capitalized.
> > ? ? >>> book_title('DIVE Into python')
> > ? ? 'Dive into Python'
> > ? ? >>> book_title('the great gatsby')
> > ? ? 'The Great Gatsby'
> > ? ? >>> book_title('the WORKS OF AleXANDer dumas')
> > ? ? 'The Works of Alexander Dumas'
> > ? ? """
> > ? ? new_title = []
> > ? ? title_split = title.strip().lower().split()
> > ? ? for word in title_split:
> > ? ? ? ? if title_split[0] in small_words:
> > ? ? ? ? ? ? new_title.append(word.title())
> > ? ? ? ? elif word in small_words:
> > ? ? ? ? ? ? new_title.append(word.lower())
> > ? ? ? ? else:
> > ? ? ? ? ? ? new_title.append(word.title())
> > ? ? return(' '.join(new_title))
>
> > def _test():
> > ? ? import doctest, refactory
> > ? ? return doctest.testmod(refactory)
> > if __name__ == "__main__":
> > ? ? _test()
>
> > All tests are failing even though I am getting the correct output on
> > the first two tests. And the last test still gives me "Of" instead of
> > "of"
>
> > Any help is appreciated.
>
> I don't know about doctest -- I suspect it wants a structured docstring to
> specify the tests -- but this
>
> ? ? ? ? if title_split[0] in small_words:
> ? ? ? ? ? ? new_title.append(word.title())
>
> can't be what you want.
>
> ? ? ? ? Mel.

Agreed. Not what I need.


From laddosingh at gmail.com  Sun Sep 11 12:39:12 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:39:12 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.934.1315655395.27778.python-list@python.org>
Message-ID: <d8154628-4307-4ec9-b3ee-cb9767b1355a@o9g2000vbo.googlegroups.com>

On 10 Sep, 13:50, Thomas Jollans <t... at jollybox.de> wrote:
> On 10/09/11 13:20, Tigerstyle wrote:
>
> > Hi guys.
>
> > I'm strugglin with some homework stuff and am hoping you can help me
> > out here.
>
> > All tests are failing even though I am getting the correct output on
> > the first two tests. And the last test still gives me "Of" instead of
> > "of"
>
> Cannot reproduce. I only get the one, expected, failure.
>
> % python -m doctest books.py
> **********************************************************************
> File "books.py", line 12, in books.book_title
> Failed example:
> ? ? book_title('the WORKS OF AleXANDer dumas')
> Expected:
> ? ? 'The Works of Alexander Dumas'
> Got:
> ? ? 'The Works Of Alexander Dumas'
> **********************************************************************
> 1 items had failures:
> ? ?1 of ? 3 in books.book_title
> ***Test Failed*** 1 failures.
>
>
>
> > def _test():
> > ? ? import doctest, refactory
> > ? ? return doctest.testmod(refactory)
> > if __name__ == "__main__":
> > ? ? _test()
>
> What is this "refactory"? Are you testing the right code? What is the
> output of your test - does it make sense for the module?
>
> Thomas

Still struggling with my test failing. All 3 tests fail. I'm using
Ecplipse and I think Eclipse is what causing this.


From laddosingh at gmail.com  Sun Sep 11 12:40:26 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:40:26 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<mailman.940.1315670200.27778.python-list@python.org>
Message-ID: <bf53d530-0d06-4de3-8c14-7d70ff6428ed@b20g2000vbz.googlegroups.com>

On 10 Sep, 17:56, Chris Angelico <ros... at gmail.com> wrote:
> On Sat, Sep 10, 2011 at 10:24 PM, Alister Ware
>
> <alister.w... at ntlworld.com> wrote:
> > Ignoring the docttests my process would be to process each word & then
> > manually capitalize he 1st word, .I would als0 use a comprehension as
> > makes for cleaner code:-
>
> > def capitalize(word):
> > ? ?if word in small_words:
> > ? ? ? ?return word
> > ? ?else:
> > ? ? ? ?return word.title()
>
> And I'd do this with a lambda, but that's just me. Of course, if your
> logic is more complicated, it makes more sense to keep it in a named
> function, but a single conditional call can fit nicely into a lambda.
>
> ChrisA

Lambda is too complicated for me to understand yet. Will get there
after a little while. Where would you put this piece of code?


From laddosingh at gmail.com  Sun Sep 11 12:42:28 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:42:28 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.933.1315655225.27778.python-list@python.org>
	<bc13c81c-11f3-485b-ae17-f31ed6828be3@et6g2000vbb.googlegroups.com>
Message-ID: <8fc2dea1-a5ef-4d7f-a0f2-e0be56e21e22@h7g2000yqm.googlegroups.com>

On 11 Sep, 04:12, t... at thsu.org wrote:
> On Sep 10, 7:47?am, Peter Otten <__pete... at web.de> wrote:
>
>
>
>
>
>
>
>
>
> > Tigerstyle wrote:
> > > I'm strugglin with some homework stuff and am hoping you can help me
> > > out here.
>
> > > This is the code:
>
> > > small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
> > > ? ? new_title = []
> > > ? ? title_split = title.strip().lower().split()
> > > ? ? for word in title_split:
> > > ? ? ? ? if title_split[0] in small_words:
> > > ? ? ? ? ? ? new_title.append(word.title())
> > > ? ? ? ? elif word in small_words:
> > > ? ? ? ? ? ? new_title.append(word.lower())
> > > ? ? ? ? else:
> > > ? ? ? ? ? ? new_title.append(word.title())
>
> > The logic of the for-loop is flawed; the expression
>
> > title_split[0] in small_words
>
> > will always evaluate to True if the first word is a "small word", even when
> > the loop is already past the first word. You can work around that with a
> > flag along these lines
>
> > first = True
> > for word in title_split:
> > ? ? if first:
> > ? ? ? ? # special treatment for the first word
> > ? ? ? ? first = False
> > ? ? else:
> > ? ? ? ? # put checks for all words but the first here
> > ? ? new_title.append(fixed_word) # assuming you have stored the titlecased
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# or lowercased word in the fixed_word
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?# variable
>
> Another way to tackle this is to just capitalize the entire sentence
> before returning it.
>
> new_title = []
> title_split = title.strip().lower().split()
> for word in title_split:
> ? if word in small_words:
> ? ? new_title.append(word.lower())
> ? else:
> ? ? new_title.append(word.title())
> return(''.join(new_title).capitalize())
>
> However, I'm only helping with your homework, because I want to point
> out that doctest comments should be *readable*. Don't just throw them
> in, take the extra 10-15 seconds to make them easier on the eyes. In
> the workplace, months will pass before you review this code again, so
> you want to make it easier for an older version of yourself to
> remember it.
>
> And it takes very little effort to make it readable. Here's your
> doctest string, reformatted with just a tiny bit more whitespace. I
> even cut out a sentence.
>
> def book_title(title):
> ? """
> ? All words EXCEPT for small words are made title case
> ? unless the string starts with a preposition, in which
> ? case the word is correctly capitalized.
>
> ? >>> book_title('DIVE Into python')
> ? 'Dive into Python'
> ? >>> book_title('the great gatsby')
> ? 'The Great Gatsby'
> ? >>> book_title('the WORKS OF AleXANDer dumas')
> ? 'The Works of Alexander Dumas'
> ? """
> --
> // T.Hsu

It capitalises the phrase, but still the rest of the phrase is in
lower case.


From laddosingh at gmail.com  Sun Sep 11 12:43:31 2011
From: laddosingh at gmail.com (Tigerstyle)
Date: Sun, 11 Sep 2011 09:43:31 -0700 (PDT)
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<j4grlj$dg2$1@dough.gmane.org>
	<mailman.972.1315721914.27778.python-list@python.org>
Message-ID: <208f1e6b-66ca-4988-a41a-d83924cb8593@m18g2000vbe.googlegroups.com>

On 11 Sep, 08:18, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Sat, 10 Sep 2011 16:25:42 -0700, Dennis Lee Bieber
> <wlfr... at ix.netcom.com> declaimed the following in
> gmane.comp.python.general:
>
>
>
> > in the language documentation... It will give you a simple way to know
> > if you are looking at the first word. Basically, you want to title-case
> > the word IF it is the first word OR the word is NOT in the list of
> > lowercase words; anything else goes through as lower case...
>
> ? ? ? ? Of course, most of this can be done in a single line (including
> taking into account that some words may have a punctuation mark which
> would confuse the original).
>
> >>> smalls = ['into', 'the', 'a', 'of', 'at', 'in', 'for', 'on' ]
> >>> punct = ".,;:?!;'\"(){}[]"
> >>> def recase(str = "physicist odd-affection, or how i was taught to stop fretting and adore the weapon of mass destruction"):
>
> ... ? ? return " ".join( w.title() if i == 0 or w.strip(punct) not in
> smalls else w
> ... ? ? ? ? ? ? ? ? ? ? for i,w in enumerate(str.lower().strip().split()) )
> ...>>> recase()
>
> 'Physicist Odd-Affection, Or How I Was Taught To Stop Fretting And Adore
> the Weapon of Mass Destruction'>>> recase("what? me worry?")
> 'What? Me Worry?'
> >>> recase("the end of the matter is, to be blunt, a confusion")
>
> 'The End of the Matter Is, To Be Blunt, a Confusion'>>> recase("the end of the matter is in, to be blunt, a confusion")
>
> 'The End of the Matter Is in, To Be Blunt, a Confusion'>>> smalls = ['into', 'the', 'a', 'of', 'at', 'in', 'for', 'on', "and", "is", "to" ]
> >>> recase()
>
> 'Physicist Odd-Affection, Or How I Was Taught To Stop Fretting and Adore
> the Weapon of Mass Destruction'>>> recase("the end of the matter is in, to be blunt, a confusion")
>
> 'The End of the Matter is in, to Be Blunt, a Confusion'
>
>
>
> ? ? ? ? Of course, explaining what this construct is doing is the trick to
> justifying it for a homework assignment.
> --
> ? ? ? ? Wulfraed ? ? ? ? ? ? ? ? Dennis Lee Bieber ? ? ? ? AF6VN
> ? ? ? ? wlfr... at ix.netcom.com ? ?HTTP://wlfraed.home.netcom.com/

Too much destruction in this post man, and yeah I would not be able to
explain the code for my homework.


From tjreedy at udel.edu  Sun Sep 11 12:47:08 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 12:47:08 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
Message-ID: <j4iomc$te4$1@dough.gmane.org>

On 9/11/2011 12:01 AM, Ian Kelly wrote:
> On Sat, Sep 10, 2011 at 1:36 PM, Terry Reedy<tjreedy at udel.edu>  wrote:
>> The statement containing the explicit next(items) call can optionally be
>> wrapped to explicitly handle the case of an empty iterable in whatever
>> manner is desired.
>>
>> try:
>>     <set up with next(items)>
>> except StopIteration:
>>     raise ValueError("iterable cannot be empty")
>
> The only time that's optional

This is an opinion, or rather, a programming philosophy based on 
technical facts, rather than a fact itself. You do raise an important issue.

> is when you're writing an iterator and
> the try-except would end up looking like this:
>
> try:
>      # do stuff with next(items)
> except StopIteration:
>      raise StopIteration
>
> And even then, it's probably a good idea to clearly document that
> you're allowing a StopIteration from one iterator to propagate up as a
> StopIteration for another.

In the yield-pairs example,

def pairs(iterable):
     it = iter(iterable)
     for i in it:
         yield i, next(it)

ignoring StopIteration from the get-even explicit next means ignoring an 
odd item. If pairs() were in a general purpose library, it should have a 
doc string that specifies that, and a test case with an odd number of 
items. I would consider a comment in the code itself to be optional, 
depending on the intended or expected human audience and the context of 
presentation. In this context, the explanation is in the text that 
surrounds the code.

> Apart from that case, whenever you call next() you should always be
> prepared to catch a StopIteration.

To me, it depends on the contract or specification of the function. If 
the behavior for an empty input iterator is not specified, then there is 
no basis for writing the body of an except clause.

While in the past few months I have written examples of all of the three 
explicit-next use cases I gave, I was prompted to write them up now by 
Tigerstyle's 'Doctest failing' thread. The specification by example 
(perhaps given by an instructor) did not include an empty title that 
would lead to an empty list of title words. Certainly, the doc for

def fix_title(title):
     small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
     twords = iter(title.strip().lower().split())
     new_title = [next(twords)]
     for word in twords:
         if word not in small_words:
             word = word.title()
         new_title.append(word)
     return(' '.join(new_title))

should start "Given a title with at least one word, ...".

The Agile Programming Test-Driven-Development maxim, 'Write the minimum 
code needed to pass the test' says that the extra lines needed to catch 
and process StopIteration should *not* be written until there is a test 
case leading to such.

> Letting a StopIteration propagate
> up the stack to parts unknown is bad juju because it's a flow control
> exception, not an error-signaling exception.  If it happens to
> propagate up to another for loop, then it will break out of the for
> loop, and the exception will simply be swallowed.

What you are saying is a) that the following code

for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
     print(fix_title(title))

will print 'Amazing', 'A Hell of a Fight', and stop; b) that this is the 
worst choice of how to handle the empty title; and c) that in real world 
world programming, *someone* should decide whether fix_title('') returns 
'' or raises ValueError.

A counter-argument could be 1. that when a function's contract is 
violated, invoking unspecified behavior, anything is allowed; or 2. that 
titles are checked for actual content before the case fixup is called, 
and the time and mental energy required to define and test behavior for 
impossible input is wasted and better spent on something more useful.

-- 
Terry Jan Reedy



From andreas.perstinger at gmx.net  Sun Sep 11 12:47:42 2011
From: andreas.perstinger at gmx.net (Andreas Perstinger)
Date: Sun, 11 Sep 2011 18:47:42 +0200
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
Message-ID: <j4ionf$tjq$1@dough.gmane.org>

On 2011-09-11 13:17, Kayode Odeyemi wrote:
> On Sun, Sep 11, 2011 at 11:41 AM, Thomas Jollans<t at jollybox.de>  wrote:
>>  It is working:
>>
>>  >>>  class A(object):
>>  ...     def log (self, module):
>>  ...         return str ('logged')
>>  ...
>>  >>>  class B(A):
>>  ...     def __init__(self, module):
>>  ...         self.module = A().log(module)
>>  ...
>>  >>>  c = B('system')
>>  >>>  c.module
>>  'logged'
>
> Why do you have to do c.module? I'm expecting an output just by creating an
> instance of B.

Why do you expect an output? In B.__init__ you are just assigning the 
return value from A.log() to the attribute "module" and in A.log() there 
is no output either.

Bye, Andreas



From tjreedy at udel.edu  Sun Sep 11 13:03:32 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 13:03:32 -0400
Subject: Doctest failing
In-Reply-To: <fceb391d-8ac5-4eef-b89e-72c7327fc266@o26g2000vbi.googlegroups.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<mailman.943.1315677614.27778.python-list@python.org>
	<fceb391d-8ac5-4eef-b89e-72c7327fc266@o26g2000vbi.googlegroups.com>
Message-ID: <j4ipl4$4h7$1@dough.gmane.org>

On 9/11/2011 7:46 AM, Tigerstyle wrote:

> Thank you Terry,

> I went for this solution as it was the easiest for me to understand
> and comment myself keeping in mind what level I am at right now.
> Thanks a ton to everyone for sharing so much information and making it
> easy to read and understand your thoughts. This was surely very very
> educating read the replies from so many talented people.

You are welcome. For more, see my thread "Idioms combining 'next(items)' 
and 'for item in items:'" and the responses.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sun Sep 11 14:09:18 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 14:09:18 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4idpg$t29$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org> <j4idpg$t29$1@dough.gmane.org>
Message-ID: <j4itgf$1k9$1@dough.gmane.org>

On 9/11/2011 9:41 AM, Peter Otten wrote:
> Terry Reedy wrote:
>
>> 3. Process the items of an iterable in pairs.
>>
>> items = iter(iterable)
>> for first in items:
>>       second = next(items)
>>       <process first and second>
>>
>> This time, StopIteration is raised for an odd number of items. Catch and
>> process as desired. One possibility is to raise ValueError("Iterable
>> must have an even number of items").
>
> Another way is zip-based iteration:
>
> (a) silently drop the odd item
>
> items = iter(iterable)
> for first, second in zip(items, items): # itertools.izip in 2.x
>     ...

In practice, I would use this rather than the loop above. However, I 
wanted to introduce the idea then used in the intermittent pairing of 
surrogates.

> (b) add a fill value
>
> for first, second in itertools.zip_longest(items, items):
>      ...
>
> (c) raise an exception
>
> Unfortunately there is no zip_exc() that guarantees that all iterables are
> of the same "length", but I've written a recipe some time ago
>
> http://code.activestate.com/recipes/497006-zip_exc-a-lazy-zip-that-ensures-
> that-all-iterables/
>
> that achieves near-C speed.

Interesting. It took a moment to see the general idea. For some reason, 
you timeit examples in the comment now all have "data = [range(1000)]3", 
missing '*'.

-- 
Terry Jan Reedy



From ethan at stoneleaf.us  Sun Sep 11 14:43:38 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 11 Sep 2011 11:43:38 -0700
Subject: Doctest failing
In-Reply-To: <CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
Message-ID: <4E6D015A.3070500@stoneleaf.us>

Chris Angelico wrote:
> On Sat, Sep 10, 2011 at 10:24 PM, Alister Ware
> <alister.ware at ntlworld.com> wrote:
>> Ignoring the docttests my process would be to process each word & then
>> manually capitalize he 1st word, .I would als0 use a comprehension as
>> makes for cleaner code:-
>>
>> def capitalize(word):
>>    if word in small_words:
>>        return word
>>    else:
>>        return word.title()
> 
> And I'd do this with a lambda, but that's just me. Of course, if your
> logic is more complicated, it makes more sense to keep it in a named
> function, but a single conditional call can fit nicely into a lambda.

Lambdas are great when needed, but if don't *need* it, and you have more 
than a few, debugging can be a nightmare... "Okay, so this is function 
<lambda>... and that is function <lambda>... and over here we also have 
function <lambda>... ARGH!"

~Ethan~


From timr at probo.com  Sun Sep 11 14:48:01 2011
From: timr at probo.com (Tim Roberts)
Date: Sun, 11 Sep 2011 11:48:01 -0700
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <re0q675ntaul3914kgkd1118f7tf5grq70@4ax.com>

"Littlefield, Tyler" <tyler at tysdomain.com> wrote:
>
>I don't much care for PHP, but the thing that can be said for it is it's 
>pretty quick. How does Python compare?

PHP is quick for development, in that you can slap together some schlock
and have it mostly work.  The result, however, is usually schlock.  The
performance of the language itself is almost entirely irrelevant; the
execution time is swamped by the network overhead.

>I'm also curious what databases are suggested? I've always 
>done most of my work in MYSql, but from what I understand postgresql is 
>becoming more popular to.

Well, that's a religious argument.  Personally, I've always been confused
by the draw of MySql.  From the very beginning, Postgres has always been
more powerful, more reliable, more standard-compliant, and more
professional.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From ethan at stoneleaf.us  Sun Sep 11 15:01:53 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 11 Sep 2011 12:01:53 -0700
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4iomc$te4$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
Message-ID: <4E6D05A1.5010506@stoneleaf.us>

Terry Reedy wrote:
> On 9/11/2011 12:01 AM, Ian Kelly wrote:
>> On Sat, Sep 10, 2011 at 1:36 PM, Terry Reedy<tjreedy at udel.edu>  wrote:
>>> The statement containing the explicit next(items) call can optionally be
>>> wrapped to explicitly handle the case of an empty iterable in whatever
>>> manner is desired.
>>>
>>> try:
>>>     <set up with next(items)>
>>> except StopIteration:
>>>     raise ValueError("iterable cannot be empty")
>>
>> The only time that's optional
> 
> This is an opinion, or rather, a programming philosophy based on 
> technical facts, rather than a fact itself. You do raise an important 
> issue.
> 
>> is when you're writing an iterator and
>> the try-except would end up looking like this:
>>
>> try:
>>      # do stuff with next(items)
>> except StopIteration:
>>      raise StopIteration
>>
>> And even then, it's probably a good idea to clearly document that
>> you're allowing a StopIteration from one iterator to propagate up as a
>> StopIteration for another.
> 
> In the yield-pairs example,
> 
> def pairs(iterable):
>     it = iter(iterable)
>     for i in it:
>         yield i, next(it)
> 
> ignoring StopIteration from the get-even explicit next means ignoring an 
> odd item. If pairs() were in a general purpose library, it should have a 
> doc string that specifies that, and a test case with an odd number of 
> items. I would consider a comment in the code itself to be optional, 
> depending on the intended or expected human audience and the context of 
> presentation. In this context, the explanation is in the text that 
> surrounds the code.
> 
>> Apart from that case, whenever you call next() you should always be
>> prepared to catch a StopIteration.
> 
> To me, it depends on the contract or specification of the function. If 
> the behavior for an empty input iterator is not specified, then there is 
> no basis for writing the body of an except clause.
> 
> While in the past few months I have written examples of all of the three 
> explicit-next use cases I gave, I was prompted to write them up now by 
> Tigerstyle's 'Doctest failing' thread. The specification by example 
> (perhaps given by an instructor) did not include an empty title that 
> would lead to an empty list of title words. Certainly, the doc for
> 
> def fix_title(title):
>     small_words = ('into', 'the', 'a', 'of', 'at', 'in', 'for', 'on')
>     twords = iter(title.strip().lower().split())
>     new_title = [next(twords)]
>     for word in twords:
>         if word not in small_words:
>             word = word.title()
>         new_title.append(word)
>     return(' '.join(new_title))
> 
> should start "Given a title with at least one word, ...".
> 
> The Agile Programming Test-Driven-Development maxim, 'Write the minimum 
> code needed to pass the test' says that the extra lines needed to catch 
> and process StopIteration should *not* be written until there is a test 
> case leading to such.
> 
>> Letting a StopIteration propagate
>> up the stack to parts unknown is bad juju because it's a flow control
>> exception, not an error-signaling exception.  If it happens to
>> propagate up to another for loop, then it will break out of the for
>> loop, and the exception will simply be swallowed.
> 
> What you are saying is a) that the following code
> 
> for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
>     print(fix_title(title))
> 
> will print 'Amazing', 'A Hell of a Fight', and stop; b) that this is the 
> worst choice of how to handle the empty title; and c) that in real world 
> world programming, *someone* should decide whether fix_title('') returns 
> '' or raises ValueError.
> 
> A counter-argument could be 1. that when a function's contract is 
> violated, invoking unspecified behavior, anything is allowed; or 2. that 
> titles are checked for actual content before the case fixup is called, 
> and the time and mental energy required to define and test behavior for 
> impossible input is wasted and better spent on something more useful.


Having spent hours tracking down errors because somebody did not address 
  a corner case, I find counter-argument 1 unhelpful.

Counter-argument 2 I can at least partially agree with; however, in this 
case where the uncaught exception can mess up flow control elsewhere I 
do not -- the StopIteration should be caught and changed to something 
appropriate, such as EmptyTitle (assuming blank titles are errors -- 
which they probably should be... "Hello, do you have the book '' for 
sale here?")

~Ethan~


From laurent.payot at gmail.com  Sun Sep 11 15:22:26 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sun, 11 Sep 2011 12:22:26 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <26428844-acd2-4c7b-bc6a-cf5a8a6259bc@glegroupsg2000goo.googlegroups.com>

+1 for PostgreSQL. It's faster than MySQL for years now, and is much more seriously featured.
If you don't need ACID properties (transactions stuff) you should also give Document-based databases like MongoDB a try. It changed my code life.


From laurent.payot at gmail.com  Sun Sep 11 15:22:26 2011
From: laurent.payot at gmail.com (Laurent)
Date: Sun, 11 Sep 2011 12:22:26 -0700 (PDT)
Subject: using python in web applications
In-Reply-To: <mailman.924.1315626929.27778.python-list@python.org>
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <26428844-acd2-4c7b-bc6a-cf5a8a6259bc@glegroupsg2000goo.googlegroups.com>

+1 for PostgreSQL. It's faster than MySQL for years now, and is much more seriously featured.
If you don't need ACID properties (transactions stuff) you should also give Document-based databases like MongoDB a try. It changed my code life.


From Phillip.M.Feldman at gmail.com  Sun Sep 11 15:41:33 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sun, 11 Sep 2011 12:41:33 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <j4iamn$ave$1@dough.gmane.org>
References: <32440187.post@talk.nabble.com> <j4iamn$ave$1@dough.gmane.org>
Message-ID: <32443548.post@talk.nabble.com>


Hello Peter,

When I run my code, I get the same 14 configurations that your code
produces; the only different that I can see in the output is that the
configurations are produced in a different order.  Note that your code is
not creating an iterator, so thus doesn't do what I want.  Also, generating
the product set and then testing whether the total number of balls is
correct will potentially consider a huge number of cases that must be
rejected because the sum is wrong; this is too inefficient.

Phillip

In [2]: list(balls_in_numbered_boxes(10,[4,3,2,1,2]))
Out[2]:
[(4, 3, 2, 1, 0),
 (4, 3, 2, 0, 1),
 (4, 3, 1, 1, 1),
 (4, 3, 1, 0, 2),
 (4, 3, 0, 1, 2),
 (4, 2, 2, 1, 1),
 (4, 2, 2, 0, 2),
 (4, 2, 1, 1, 2),
 (4, 1, 2, 1, 2),
 (3, 3, 2, 1, 1),
 (3, 3, 2, 0, 2),
 (3, 3, 1, 1, 2),
 (3, 2, 2, 1, 2),
 (2, 3, 2, 1, 2)]
-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32443548.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From Phillip.M.Feldman at gmail.com  Sun Sep 11 15:48:07 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sun, 11 Sep 2011 12:48:07 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <CAMZYqRSLbPz85KpEUH0QWiP=Jf-mUwjy8BGgOsj_mvFsFme_0g@mail.gmail.com>
References: <32440187.post@talk.nabble.com>
	<CAMZYqRSLbPz85KpEUH0QWiP=Jf-mUwjy8BGgOsj_mvFsFme_0g@mail.gmail.com>
Message-ID: <32443579.post@talk.nabble.com>


Chris,

Your code is much cleaner than mine.  I will have to figure out exactly how
it is working.

Thanks!

Phillip


-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32443579.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From hidura at gmail.com  Sun Sep 11 15:53:24 2011
From: hidura at gmail.com (hidura at gmail.com)
Date: Sun, 11 Sep 2011 19:53:24 +0000
Subject: using python in web applications
In-Reply-To: <re0q675ntaul3914kgkd1118f7tf5grq70@4ax.com>
References: <mailman.924.1315626929.27778.python-list@python.org><re0q675ntaul3914kgkd1118f7tf5grq70@4ax.com>
Message-ID: <952711646-1315770807-cardhu_decombobulator_blackberry.rim.net-827506045-@b12.c22.bise6.blackberry>

I am agree with postgresql i don' t have any problem, also is better for big applications. And Python is always better language than PHP if you' re going to create a web app.
Sent from my BlackBerry? wireless device

-----Original Message-----
From: Tim Roberts <timr at probo.com>
Sender: python-list-bounces+hidura=gmail.com at python.org
Date: Sun, 11 Sep 2011 11:48:01 
To: <python-list at python.org>
Subject: Re: using python in web applications

"Littlefield, Tyler" <tyler at tysdomain.com> wrote:
>
>I don't much care for PHP, but the thing that can be said for it is it's 
>pretty quick. How does Python compare?

PHP is quick for development, in that you can slap together some schlock
and have it mostly work.  The result, however, is usually schlock.  The
performance of the language itself is almost entirely irrelevant; the
execution time is swamped by the network overhead.

>I'm also curious what databases are suggested? I've always 
>done most of my work in MYSql, but from what I understand postgresql is 
>becoming more popular to.

Well, that's a religious argument.  Personally, I've always been confused
by the draw of MySql.  From the very beginning, Postgres has always been
more powerful, more reliable, more standard-compliant, and more
professional.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.
-- 
http://mail.python.org/mailman/listinfo/python-list

From __peter__ at web.de  Sun Sep 11 16:13:02 2011
From: __peter__ at web.de (Peter Otten)
Date: Sun, 11 Sep 2011 22:13:02 +0200
Subject: recursive algorithm for balls in numbered boxes
References: <32440187.post@talk.nabble.com> <j4iamn$ave$1@dough.gmane.org>
	<32443548.post@talk.nabble.com>
Message-ID: <j4j4nq$jkg$1@dough.gmane.org>

Dr. Phillip M. Feldman wrote:

> When I run my code, I get the same 14 configurations that your code
> produces; 

I'm sorry, I ran the buggy code from

http://old.nabble.com/file/p32439307/balls_in_numbered_boxes.py

without realizing it was not 

http://old.nabble.com/file/p32440187/balls_in_numbered_boxes.py

> the only different that I can see in the output is that the
> configurations are produced in a different order.  Note that your code is
> not creating an iterator, so thus doesn't do what I want.  

The outer loop is in a generator expression and thus evaluates lazily.

> Also,
> generating the product set and then testing whether the total number of
> balls is correct will potentially consider a huge number of cases that
> must be rejected because the sum is wrong; this is too inefficient.

Indeed; I should have added a disclaimer to make that clear.



From robert.kern at gmail.com  Sun Sep 11 16:22:28 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Sun, 11 Sep 2011 15:22:28 -0500
Subject: optionparse: how to add a line break to the help text
In-Reply-To: <4E6C9614.60406@tim.thechases.com>
References: <j4gi5r$gjc$1@dough.gmane.org>	<mailman.952.1315693006.27778.python-list@python.org>	<op.v1mdm0oba8ncjz@gnudebst>	<j4h4dh$60n$1@dough.gmane.org>	<4E6C182D.60905@tim.thechases.com>
	<j4h8lh$qui$1@dough.gmane.org> <4E6C9614.60406@tim.thechases.com>
Message-ID: <j4j5a3$m5t$1@dough.gmane.org>

On 9/11/11 6:05 AM, Tim Chase wrote:

> As Ben Finney replied, optparse is now deprecated, replaced in part by argparse.
> Unfortunately, argparse wasn't backported to the standard library for earlier
> 2.x series (I think it became available in 2.7, and may run in earlier versions
> if manually added like I had to do on my Debian Py2.6 install). But that makes
> it hard for those of us who want to use a built-in option-parsing library across
> a wide variety of Python versions. I don't strongly care which I use except that
> I want it to be broadly available with minimal fuss.

argparse.py can be simply dropped into your codebase, if you want. That's about 
as minimal of fuss as you can ask for.

   http://pypi.python.org/pypi/argparse

-- 
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 rosuav at gmail.com  Sun Sep 11 18:41:05 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 08:41:05 +1000
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4iomc$te4$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
Message-ID: <CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 2:47 AM, Terry Reedy <tjreedy at udel.edu> wrote:
> What you are saying is a) that the following code
>
> for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
> ? ?print(fix_title(title))
>

At least in Python 3.2, this isn't the case. StopIteration breaks the
loop only if it's raised during the assignment, not during the body.

>>> x=iter([1,2,3,4,5])
>>> for i in x:
	print("%d - %d"%(i,next(x)))

1 - 2
3 - 4
Traceback (most recent call last):
  File "<pyshell#281>", line 2, in <module>
    print("%d - %d"%(i,next(x)))
StopIteration

Compare with:

>>> def pair(it):
	while True:
		yield next(it),next(it)

>>> x=iter([1,2,3,4,5])
>>> for i,j in pair(x):
	print("%d - %d"%(i,j))

1 - 2
3 - 4

In this case, the StopIteration bubbles up and quietly terminates the loop.

ChrisA


From tjreedy at udel.edu  Sun Sep 11 20:45:41 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 11 Sep 2011 20:45:41 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
Message-ID: <j4jknm$cpd$1@dough.gmane.org>

On 9/11/2011 6:41 PM, Chris Angelico wrote:
> On Mon, Sep 12, 2011 at 2:47 AM, Terry Reedy<tjreedy at udel.edu>  wrote:
>> What you are saying is a) that the following code
>>
>> for title in ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']:
>>     print(fix_title(title))

> At least in Python 3.2, this isn't the case. StopIteration breaks the
> loop only if it's raised during the assignment, not during the body.

It breaks the loop *silently* only if ...

>>>> x=iter([1,2,3,4,5])
>>>> for i in x:
> 	print("%d - %d"%(i,next(x)))
>
> 1 - 2
> 3 - 4
> Traceback (most recent call last):
>    File "<pyshell#281>", line 2, in<module>
>      print("%d - %d"%(i,next(x)))
> StopIteration

whereas, you are right, it breaks it noisily in the body. So Ian's claim 
that StopIteration must be caught to avoid silent termination is not 
true. Thanks for pointing out what I saw but did not cognize the full 
implication of before. A better exception and an error message with an 
explaination might still be a good idea, though.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sun Sep 11 21:03:24 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 11:03:24 +1000
Subject: Doctest failing
In-Reply-To: <4E6D015A.3070500@stoneleaf.us>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
Message-ID: <CAPTjJmqy7vE6-WZQMzbfiRo5q8xJXmAc5CjOpDDOR78mBNPiHQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 4:43 AM, Ethan Furman <ethan at stoneleaf.us> wrote:
> Chris Angelico wrote:
>>
>> And I'd do this with a lambda, but that's just me. Of course, if your
>> logic is more complicated, it makes more sense to keep it in a named
>> function, but a single conditional call can fit nicely into a lambda.
>
> Lambdas are great when needed, but if don't *need* it, and you have more
> than a few, debugging can be a nightmare... "Okay, so this is function
> <lambda>... and that is function <lambda>... and over here we also have
> function <lambda>... ARGH!"

Yeah, they can be like the Bruces sketch at times.

A lambda is basically a function defined in an expression. For instance:

def add_one(x):
   return x+1

is (practically) the same as:

add_one = lambda x: x+1

In each case, you can call that function and will get back a value.
The advantage of lambdas is that, in a list comprehension or map call,
the code is right there instead of being elsewhere in a def statement.
But as you can see, they quickly become hard to read:

[j+2 for i in [[1,2,3],[4,5,6],[7,8,9]] for j in (lambda x: [q+10 for
q in x])(i)]

Their main advantage isn't in list comps, where you can already use
arbitrary expressions, but in calls that require a function as an
argument. The map() function is very similar to a generator
expression, but it can iterate over multiple iterables at once:

>>> list(map(lambda x,y: x+y,[1,2,3],[40,50,60]))
[41, 52, 63]

Note how the lambda keeps the code right there, whereas a def would
separate it out. It's obvious from this one expression that it's
adding successive corresponding pairs.

Hope that helps!

ChrisA


From ben+python at benfinney.id.au  Sun Sep 11 21:37:10 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 12 Sep 2011 11:37:10 +1000
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
	<mailman.1011.1315789407.27778.python-list@python.org>
Message-ID: <87sjo2lewp.fsf@benfinney.id.au>

Chris Angelico <rosuav at gmail.com> writes:

> A lambda is basically a function defined in an expression. For instance:
>
> def add_one(x):
>    return x+1
>
> is (practically) the same as:
>
> add_one = lambda x: x+1

Those are only practically the same if you ignore the practical worth of
a function knowing the name it was defined with. The latter does not
have that, hence I don't see it as practically the same as the former.

-- 
 \     ?The Vatican is not a state.? a state must have territory. This |
  `\         is a palace with gardens, about as big as an average golf |
_o__)                         course.? ?Geoffrey Robertson, 2010-09-18 |
Ben Finney


From rosuav at gmail.com  Sun Sep 11 23:06:54 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 13:06:54 +1000
Subject: Doctest failing
In-Reply-To: <87sjo2lewp.fsf@benfinney.id.au>
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
	<mailman.1011.1315789407.27778.python-list@python.org>
	<87sjo2lewp.fsf@benfinney.id.au>
Message-ID: <CAPTjJmoa1bgKjNzJm7crup43FQEc2BHU7=+_jJH2S=sXpWEYtA@mail.gmail.com>

On Mon, Sep 12, 2011 at 11:37 AM, Ben Finney <ben+python at benfinney.id.au> wrote:
> Those are only practically the same if you ignore the practical worth of
> a function knowing the name it was defined with. The latter does not
> have that, hence I don't see it as practically the same as the former.
>

I know, but in the context of explaining what "lambda" means, it's
practically the same. Lambdas can't (afaik) have docstrings either,
etc, etc, but in terms of defining lambda, the two are more-or-less
equivalent.

ChrisA


From steve+comp.lang.python at pearwood.info  Mon Sep 12 00:29:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 14:29:05 +1000
Subject: Doctest failing
References: <678b89fd-82f4-4080-8b36-e4d0ba30cdbf@o9g2000vbo.googlegroups.com>
	<ZFIaq.3398$GZ.577@newsfe03.ams2>
	<CAPTjJmr2KzwuzXgkpho38+9i-+=fUeQ0WdQj=36wOFd_vjYOMQ@mail.gmail.com>
	<4E6D015A.3070500@stoneleaf.us>
	<mailman.1011.1315789407.27778.python-list@python.org>
	<87sjo2lewp.fsf@benfinney.id.au>
	<mailman.1012.1315796817.27778.python-list@python.org>
Message-ID: <4e6d8a92$0$29972$c3e8da3$5496439d@news.astraweb.com>

On Mon, 12 Sep 2011 01:06 pm Chris Angelico wrote:

> On Mon, Sep 12, 2011 at 11:37 AM, Ben Finney <ben+python at benfinney.id.au>
> wrote:
>> Those are only practically the same if you ignore the practical worth of
>> a function knowing the name it was defined with. The latter does not
>> have that, hence I don't see it as practically the same as the former.
>>
> 
> I know, but in the context of explaining what "lambda" means, it's
> practically the same. Lambdas can't (afaik) have docstrings either,
> etc, etc, but in terms of defining lambda, the two are more-or-less
> equivalent.


>>> f = lambda x: x+1
>>> f.__name__ 
'<lambda>'
>>> f.__doc__ = "Return x+1"
>>> f.__name__ = "add_one"
>>> help(f)

Help on function add_one in module __main__:

add_one(x)
    Return x+1



Lambdas are functions, no more, no less. The only difference is that the
*syntax* of the lambda statement only allows a single expression rather
that the full block of a def, and no name. But because it returns an
ordinary function object, you can post-process it just like any other
function.

Unfortunately, tracebacks ignore the function.__name__ and print the code
object name:

>>> f
<function add_one at 0xb7eb425c>
>>> f("x")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in <lambda>
TypeError: cannot concatenate 'str' and 'int' objects


and the code object name is read-only:

>>> f.func_code.co_name
'<lambda>'
>>> f.func_code.co_name = "add_one"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: readonly attribute


-- 
Steven



From jpablo.romero at gmail.com  Mon Sep 12 00:34:26 2011
From: jpablo.romero at gmail.com (=?ISO-8859-1?Q?Juan_Pablo_Romero_M=E9ndez?=)
Date: Sun, 11 Sep 2011 23:34:26 -0500
Subject: What do you guys think about adding a method "to_json"
Message-ID: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>

Hello,

What do you guys think about adding a method "to_json" to dictionaries
and sequence types? Perhaps through a module import?

Regards,

  Juan Pablo


From clp2 at rebertia.com  Mon Sep 12 00:44:01 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 11 Sep 2011 21:44:01 -0700
Subject: What do you guys think about adding a method "to_json"
In-Reply-To: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
References: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
Message-ID: <CAMZYqRTwxeZqf_M-08xHnJRvidjHUXiGGh8O0ZJadqgbT77weA@mail.gmail.com>

2011/9/11 Juan Pablo Romero M?ndez <jpablo.romero at gmail.com>:
> Hello,
>
> What do you guys think about adding a method "to_json" to dictionaries
> and sequence types? Perhaps through a module import?

Why? We already have json.dumps(); seems to cover the use case.

Cheers,
Chris


From adam.jorgensen.za at gmail.com  Mon Sep 12 01:39:52 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Mon, 12 Sep 2011 07:39:52 +0200
Subject: What do you guys think about adding a method "to_json"
In-Reply-To: <CAMZYqRTwxeZqf_M-08xHnJRvidjHUXiGGh8O0ZJadqgbT77weA@mail.gmail.com>
References: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
	<CAMZYqRTwxeZqf_M-08xHnJRvidjHUXiGGh8O0ZJadqgbT77weA@mail.gmail.com>
Message-ID: <CAMX1RokqC7RLoG9ohdGhvUbpaUbrxBMLfUKQP8YL=1-P6nyWbw@mail.gmail.com>

Perhaps an actual use-case would clarify the need for this?

2011/9/12 Chris Rebert <clp2 at rebertia.com>

> 2011/9/11 Juan Pablo Romero M?ndez <jpablo.romero at gmail.com>:
> > Hello,
> >
> > What do you guys think about adding a method "to_json" to dictionaries
> > and sequence types? Perhaps through a module import?
>
> Why? We already have json.dumps(); seems to cover the use case.
>
> Cheers,
> Chris
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From alec.taylor6 at gmail.com  Mon Sep 12 03:49:31 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Mon, 12 Sep 2011 17:49:31 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
Message-ID: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>

Good evening,

I have converted ODT to HTML using LibreOffice Writer, because I want
to convert from HTML to Creole using python-creole. Unfortunately I
get this error: "File "Convert to Creole.py", line 17
SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
on line 18, but no encoding declared; see
http://www.python.org/peps/pep-0263.html for details".

Unfortunately I can't post my document yet (it's a research paper I'm
working on), but I'm sure you'll get the same result if you write up a
document in LibreOffice Writer and add some End Notes.

How do I automate the removal of all non-ascii characters from my code?

Thanks for all suggestions,

Alec Taylor


From gherron at islandtraining.com  Mon Sep 12 04:17:44 2011
From: gherron at islandtraining.com (Gary Herron)
Date: Mon, 12 Sep 2011 01:17:44 -0700
Subject: How do I automate the removal of all non-ascii characters from
	my	code?
In-Reply-To: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
Message-ID: <4E6DC028.1020101@islandtraining.com>

On 09/12/2011 12:49 AM, Alec Taylor wrote:
> Good evening,
>
> I have converted ODT to HTML using LibreOffice Writer, because I want
> to convert from HTML to Creole using python-creole. Unfortunately I
> get this error: "File "Convert to Creole.py", line 17
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 18, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details".
>
> Unfortunately I can't post my document yet (it's a research paper I'm
> working on), but I'm sure you'll get the same result if you write up a
> document in LibreOffice Writer and add some End Notes.
>
> How do I automate the removal of all non-ascii characters from my code?
>
> Thanks for all suggestions,
>
> Alec Taylor



This question does not quite make sense.  The error message is 
complaining about a python file.  What does that file have to do with 
ODT to HTML conversion and LibreOffice?

The error message means the python file (wherever it came from) has a 
non-ascii character (as you noted), and so it needs something to tell it 
what such a character means.  (That what the encoding is.)

A comment like this in line 1 or 2 will specify an encoding:
   # -*- coding: <encoding name> -*-
but, we'll have to know more about the file "Convert to Creole.py" to 
guess what encoding name should be specified there.

You might try utf-8 or latin-1.




From alec.taylor6 at gmail.com  Mon Sep 12 04:33:14 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Mon, 12 Sep 2011 18:33:14 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
Message-ID: <CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>

from creole import html2creole

from BeautifulSoup import BeautifulSoup

VALID_TAGS = ['strong', 'em', 'p', 'ul', 'li', 'br', 'b', 'i', 'a', 'h1', 'h2']

def sanitize_html(value):

? ?soup = BeautifulSoup(value)

? ?for tag in soup.findAll(True):
? ? ? ?if tag.name not in VALID_TAGS:
? ? ? ? ? ?tag.hidden = True

? ?return soup.renderContents()
html2creole(u(sanitize_html('''<h1
style="margin-left:76.8px;margin-right:0;text-indent:0;">Abstract</h1>
? ?<p class="Standard"
style="margin-left:76.8px;margin-right:0;text-indent:0;">
[more stuff here]
"""))

On Mon, Sep 12, 2011 at 6:17 PM, Gary Herron <gherron at islandtraining.com> wrote:
> On 09/12/2011 12:49 AM, Alec Taylor wrote:
>>
>> Good evening,
>>
>> I have converted ODT to HTML using LibreOffice Writer, because I want
>> to convert from HTML to Creole using python-creole. Unfortunately I
>> get this error: "File "Convert to Creole.py", line 17
>> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
>> on line 18, but no encoding declared; see
>> http://www.python.org/peps/pep-0263.html for details".
>>
>> Unfortunately I can't post my document yet (it's a research paper I'm
>> working on), but I'm sure you'll get the same result if you write up a
>> document in LibreOffice Writer and add some End Notes.
>>
>> How do I automate the removal of all non-ascii characters from my code?
>>
>> Thanks for all suggestions,
>>
>> Alec Taylor
>
>
>
> This question does not quite make sense. ?The error message is complaining
> about a python file. ?What does that file have to do with ODT to HTML
> conversion and LibreOffice?
>
> The error message means the python file (wherever it came from) has a
> non-ascii character (as you noted), and so it needs something to tell it
> what such a character means. ?(That what the encoding is.)
>
> A comment like this in line 1 or 2 will specify an encoding:
> ?# -*- coding: <encoding name> -*-
> but, we'll have to know more about the file "Convert to Creole.py" to guess
> what encoding name should be specified there.
>
> You might try utf-8 or latin-1.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From johnjohn.tedro at gmail.com  Mon Sep 12 04:35:44 2011
From: johnjohn.tedro at gmail.com (John-John Tedro)
Date: Mon, 12 Sep 2011 08:35:44 +0000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <4E6DC028.1020101@islandtraining.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
Message-ID: <CAJPn68RgM_UEg6oQmT8Y_MRQ+8EmypNP82uBhHLzT-_goxFiHQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 8:17 AM, Gary Herron <gherron at islandtraining.com>wrote:

> On 09/12/2011 12:49 AM, Alec Taylor wrote:
>
>> Good evening,
>>
>> I have converted ODT to HTML using LibreOffice Writer, because I want
>> to convert from HTML to Creole using python-creole. Unfortunately I
>> get this error: "File "Convert to Creole.py", line 17
>> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
>> on line 18, but no encoding declared; see
>> http://www.python.org/peps/**pep-0263.html<http://www.python.org/peps/pep-0263.html>for details".
>>
>> Unfortunately I can't post my document yet (it's a research paper I'm
>> working on), but I'm sure you'll get the same result if you write up a
>> document in LibreOffice Writer and add some End Notes.
>>
>> How do I automate the removal of all non-ascii characters from my code?
>>
>> Thanks for all suggestions,
>>
>> Alec Taylor
>>
>
>
>
> This question does not quite make sense.  The error message is complaining
> about a python file.  What does that file have to do with ODT to HTML
> conversion and LibreOffice?
>
> The error message means the python file (wherever it came from) has a
> non-ascii character (as you noted), and so it needs something to tell it
> what such a character means.  (That what the encoding is.)
>
> A comment like this in line 1 or 2 will specify an encoding:
>  # -*- coding: <encoding name> -*-
> but, we'll have to know more about the file "Convert to Creole.py" to guess
> what encoding name should be specified there.
>
> You might try utf-8 or latin-1.
>
>
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>

If you are having trouble figuring out which encoding your file has, the
"file" util is often a quick and dirty solution.

#> echo "???" > test.txt
#> file test.txt
test.txt: UTF-8 Unicode text
#> iconv test.txt -f utf-8 -t latin1 > test.l1.txt
#> file test.l1.txt
test.l1.txt: ISO-8859 text

Note: I use latin1 (iso-8859-1) because it can describe the characters '?',
'?', '?'. Your encoding might be different depending on what system you are
using.

The gist is that if you specify the correct encoding as mentioned above with
the "coding"-comment, your program will probably (ish) run as intended.

-- John-John Tedro
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From stefan_ml at behnel.de  Mon Sep 12 04:43:51 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 12 Sep 2011 10:43:51 +0200
Subject: How do I automate the removal of all non-ascii characters from
	my code?
In-Reply-To: <CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>	<4E6DC028.1020101@islandtraining.com>	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
Message-ID: <j4kgo7$gaq$1@dough.gmane.org>

Alec Taylor, 12.09.2011 10:33:
> from creole import html2creole
>
> from BeautifulSoup import BeautifulSoup
>
> VALID_TAGS = ['strong', 'em', 'p', 'ul', 'li', 'br', 'b', 'i', 'a', 'h1', 'h2']
>
> def sanitize_html(value):
>
>     soup = BeautifulSoup(value)
>
>     for tag in soup.findAll(True):
>         if tag.name not in VALID_TAGS:
>             tag.hidden = True
>
>     return soup.renderContents()
> html2creole(u(sanitize_html('''<h1
> style="margin-left:76.8px;margin-right:0;text-indent:0;">Abstract</h1>
>     <p class="Standard"
> style="margin-left:76.8px;margin-right:0;text-indent:0;">
> [more stuff here]
> """))

Hi,

I'm not sure what you are trying to say with the above code, but if it's 
the code that fails for you with the exception you posted, I would guess 
that the problem is in the "[more stuff here]" part, which likely contains 
a non-ASCII character. Note that you didn't declare the source file 
encoding above. Do as Gary told you.

Stefan



From steve+comp.lang.python at pearwood.info  Mon Sep 12 04:44:29 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 18:44:29 +1000
Subject: PC locks up with list operations
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e6dc66e$0$29986$c3e8da3$5496439d@news.astraweb.com>

On Wed, 31 Aug 2011 10:33 pm Steven D'Aprano wrote:

> Twice in a couple of weeks, I have locked up my PC by running a Python 2.5
> script that tries to create a list that is insanely too big.
> 
> In the first case, I (stupidly) did something like:
> 
> mylist = [0]*12345678901234
[...]
> Apart from "Then don't do that!", is there anything I can do to prevent
> this sort of thing in the future? Like instruct Python not to request more
> memory than my PC has?


For anyone who may care, I can report that ulimit under Linux will help with
this situation.

[steve at wow-wow ~]$ ulimit -v 200000
[steve at wow-wow ~]$ python
Python 2.5 (r25:51908, Nov  6 2007, 16:54:01)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> L = range(100000000)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
MemoryError

(Of course, I would have eventually got a MemoryError even without the
ulimit. *Eventually.* After much thrashing and processes crashing and
pain.)


Does anyone else think it would be useful for Python's memory manager to
enforce user-settable limits? Even just a simple thing like "never try to
allocate more than N bytes at once" would probably go a long way to prevent
a certain class of accidental (or deliberate) DOSes.


-- 
Steven



From steve+comp.lang.python at pearwood.info  Mon Sep 12 04:49:56 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 18:49:56 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>	<4E6DC028.1020101@islandtraining.com>	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
Message-ID: <4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>

On Mon, 12 Sep 2011 06:43 pm Stefan Behnel wrote:

> I'm not sure what you are trying to say with the above code, but if it's
> the code that fails for you with the exception you posted, I would guess
> that the problem is in the "[more stuff here]" part, which likely contains
> a non-ASCII character. Note that you didn't declare the source file
> encoding above. Do as Gary told you.

Even with a source code encoding, you will probably have problems with
source files including \xe2 and other "bad" chars. Unless they happen to
fall inside a quoted string literal, I would expect to get a SyntaxError.

I have come across this myself. While I haven't really investigated in great
detail, it appears to happen when copying and pasting code from a document
(usually HTML) which uses non-breaking spaces instead of \x20 space
characters. All it takes is just one to screw things up.



-- 
Steven



From ulrich.eckhardt at dominolaser.com  Mon Sep 12 06:00:08 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Mon, 12 Sep 2011 12:00:08 +0200
Subject: Terminating an embedded interpreter
Message-ID: <j211k8-n6i.ln1@satorlaser.homedns.org>

Hi!

I'm trying to provide some scripting capabilities to a program. For that, 
I'm embedding a Python interpreter, running a script in a separate thread to 
decouple it from the UI.

Now, how should I handle rogue scripts? For example, when a script hangs in 
an endless loop, how do I signal the Python interpreter to shut down? In 
other words, I want to trigger something like what Control-C does in a 
"normal" environment.

In case it matters, the OS here is MS Windows.

Thanks!

Uli

-- 
Domino Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From rmorgan466 at gmail.com  Mon Sep 12 06:34:52 2011
From: rmorgan466 at gmail.com (Rita)
Date: Mon, 12 Sep 2011 06:34:52 -0400
Subject: working with a large file
Message-ID: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>

I have a large file, 18gb uncompressed, and I would like to know what is the
preferred method to read this file for random access. I have several
processes reading the file which different calculate arguments. My server
has 64gb of memory. Not sure what is the preferred way to do this?




-- 
--- Get your facts first, then you can distort them as you please.--
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From rosuav at gmail.com  Mon Sep 12 06:38:47 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 20:38:47 +1000
Subject: Terminating an embedded interpreter
In-Reply-To: <j211k8-n6i.ln1@satorlaser.homedns.org>
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
Message-ID: <CAPTjJmq=bL8MT-H53-TPSXm2TtJOoFkMG-VNzUts_8sMk4SayQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 8:00 PM, Ulrich Eckhardt
<ulrich.eckhardt at dominolaser.com> wrote:
> Now, how should I handle rogue scripts? For example, when a script hangs in
> an endless loop, how do I signal the Python interpreter to shut down? In
> other words, I want to trigger something like what Control-C does in a
> "normal" environment.
>

You can use PyErr_SetInterrupt to raise KeyboardInterrupt, but it can
be caught by the script. There's no guaranteed way, short of killing
the process.

ChrisA


From wolfgang at rohdewald.de  Mon Sep 12 06:45:00 2011
From: wolfgang at rohdewald.de (Wolfgang Rohdewald)
Date: Mon, 12 Sep 2011 12:45:00 +0200
Subject: working with a large file
In-Reply-To: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
References: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
Message-ID: <201109121245.00224.wolfgang@rohdewald.de>

On Montag 12 September 2011, Rita wrote:
> I have a large file, 18gb uncompressed, and I would like to
> know what is the preferred method to read this file for
> random access. I have several processes reading the file
> which different calculate arguments. My server has 64gb of
> memory. Not sure what is the preferred way to do this?

if the data is structured, you could store it in 
something like sqlite

-- 
Wolfgang


From steve+comp.lang.python at pearwood.info  Mon Sep 12 07:08:22 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Mon, 12 Sep 2011 21:08:22 +1000
Subject: Terminating an embedded interpreter
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
Message-ID: <4e6de828$0$29993$c3e8da3$5496439d@news.astraweb.com>

Ulrich Eckhardt wrote:

> Hi!
> 
> I'm trying to provide some scripting capabilities to a program. For that,
> I'm embedding a Python interpreter, running a script in a separate thread
> to decouple it from the UI.
> 
> Now, how should I handle rogue scripts? For example, when a script hangs
> in an endless loop, how do I signal the Python interpreter to shut down?

If you are using threads, they all run within the same Python process. You
can ask a thread to shut down, but you can't force it to from the outside.
If the thread runs a script that goes rogue, the script may never return
control to the thread long enough for it to respond to your request.

The main UI loop can still kill itself, and take all the threads with it, by
calling sys.exit. Or if you really need to, os.abort or os._exit can be
used for immediate "terminate yourself NOW!!!" commands. (But read the docs
for them first.)

A better way may be to run the script in a separate process. You can kill
the process the same way you would any other rogue process: by sending it a
signal. See the os and subprocess modules.

But Python's sandboxing abilities are not great. If you really fear rogue,
or malicious, scripts, perhaps Python is not the right language for this
task. Otherwise, just trust the script to be sane.



-- 
Steven



From roy at panix.com  Mon Sep 12 07:40:00 2011
From: roy at panix.com (Roy Smith)
Date: Mon, 12 Sep 2011 07:40:00 -0400
Subject: PC locks up with list operations
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<4e6dc66e$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-748F48.07400012092011@news.panix.com>

In article <4e6dc66e$0$29986$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> > mylist = [0]*12345678901234
> [...]
> > Apart from "Then don't do that!", is there anything I can do to prevent
> > this sort of thing in the future? Like instruct Python not to request more
> > memory than my PC has?
> 
> 
> For anyone who may care, I can report that ulimit under Linux will help with
> this situation.
> [...]
> Does anyone else think it would be useful for Python's memory manager to
> enforce user-settable limits?

Not me.  You've already discovered that ulimit does exactly what you 
want.  Why would be gained by having Python duplicate this functionality?


From ulrich.eckhardt at dominolaser.com  Mon Sep 12 08:01:47 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Mon, 12 Sep 2011 14:01:47 +0200
Subject: Terminating an embedded interpreter
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
	<4e6de828$0$29993$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <m681k8-lhm.ln1@satorlaser.homedns.org>

Steven D'Aprano wrote:
> Ulrich Eckhardt wrote:
>> I'm trying to provide some scripting capabilities to a program. For that,
>> I'm embedding a Python interpreter, running a script in a separate thread
>> to decouple it from the UI.
>> 
>> Now, how should I handle rogue scripts? For example, when a script hangs
>> in an endless loop, how do I signal the Python interpreter to shut down?
> 
> If you are using threads, they all run within the same Python process. You
> can ask a thread to shut down, but you can't force it to from the outside.
> If the thread runs a script that goes rogue, the script may never return
> control to the thread long enough for it to respond to your request.

Sorry, I described badly what I was doing. The program itself is written in 
C++ and I'm running the Python interpreter in a thread separate to the UI, 
just in order to not hang the UI if anything in the interpreter blocks for 
extended amounts of time. I know that a Python thread is not a "system" 
thread but handled and scheduled internally by Python.


> The main UI loop can still kill itself, and take all the threads with it,
> by calling sys.exit. Or if you really need to, os.abort or os._exit can be
> used for immediate "terminate yourself NOW!!!" commands. (But read the
> docs for them first.)

> A better way may be to run the script in a separate process. You can kill
> the process the same way you would any other rogue process: by sending it
> a signal. See the os and subprocess modules.

Yes, a separate process would be much cleaner, but it would complicate 
communication back to the parent process. The Python code is supposed to 
call a few functions I exported. I'd have to tunnel these calls through 
stdin/stdout/stderr and that is more than what I'm willing to do at the 
moment. It does sound intriguing though, since that would allow me to embed 
any scripting language, not just Python.


> But Python's sandboxing abilities are not great. If you really fear rogue,
> or malicious, scripts, perhaps Python is not the right language for this
> task. Otherwise, just trust the script to be sane.

I'm not fearing malicious scripts. I'm also not concerned about rare hangs 
since this in an internal tool. In this case, I'd take a simple 99% solution 
over a complex 100% solution.


Thank you for your thoughts, Steven!

Uli

-- 
Domino Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From ulrich.eckhardt at dominolaser.com  Mon Sep 12 08:05:04 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Mon, 12 Sep 2011 14:05:04 +0200
Subject: Terminating an embedded interpreter
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
	<mailman.1026.1315823930.27778.python-list@python.org>
Message-ID: <qc81k8-lhm.ln1@satorlaser.homedns.org>

Chris Angelico wrote:
> You can use PyErr_SetInterrupt to raise KeyboardInterrupt

This sounds useful. Just to make sure, this would be called from a different 
thread than the one running the Python script, is that still OK?

> , but it can be caught by the script. There's no guaranteed way,
> short of killing the process.

This will do for my plans, I'm not trying to defend against anything 
malicious.


Thanks you!

Uli


-- 
Domino Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From davea at ieee.org  Mon Sep 12 08:09:59 2011
From: davea at ieee.org (Dave Angel)
Date: Mon, 12 Sep 2011 08:09:59 -0400
Subject: How do I automate the removal of all non-ascii characters from
	my	code?
In-Reply-To: <4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>	<4E6DC028.1020101@islandtraining.com>	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E6DF697.2010208@ieee.org>

On 01/-10/-28163 02:59 PM, Steven D'Aprano wrote:
> On Mon, 12 Sep 2011 06:43 pm Stefan Behnel wrote:
>
>> I'm not sure what you are trying to say with the above code, but if it's
>> the code that fails for you with the exception you posted, I would guess
>> that the problem is in the "[more stuff here]" part, which likely contains
>> a non-ASCII character. Note that you didn't declare the source file
>> encoding above. Do as Gary told you.
> Even with a source code encoding, you will probably have problems with
> source files including \xe2 and other "bad" chars. Unless they happen to
> fall inside a quoted string literal, I would expect to get a SyntaxError.
>
> I have come across this myself. While I haven't really investigated in great
> detail, it appears to happen when copying and pasting code from a document
> (usually HTML) which uses non-breaking spaces instead of \x20 space
> characters. All it takes is just one to screw things up.
>
>

For me, more common than non-breaking space is the "smart quotes" 
characters.  In that case, one probably doesn't want to delete them, but 
instead convert them into standard quotes.

DaveA


From nobody at nowhere.com  Mon Sep 12 08:19:25 2011
From: nobody at nowhere.com (Nobody)
Date: Mon, 12 Sep 2011 13:19:25 +0100
Subject: PC locks up with list operations
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.599.1314794452.27778.python-list@python.org>
	<4e5e2d81$0$29991$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <pan.2011.09.12.12.19.25.369000@nowhere.com>

On Wed, 31 Aug 2011 22:47:59 +1000, Steven D'Aprano wrote:

>> Linux seems to fair badly when programs use more memory than physically
>> available. Perhaps there's some per-process thing that can be used to
>> limit things on Linux?
> 
> As far as I know, ulimit ("user limit") won't help. It can limit the amount
> of RAM available to a process, but that just makes the process start using
> virtual memory more quickly. It can also limit the amount of virtual memory
> used by the shell, but not of other processes. In other words, Linux will
> try really, really, really hard to give you the 84 gigabytes you've asked
> for on a 2 GB system, even if it means DOSing your system for a month.
> 
> Of course, I would be very happy to learn I'm wrong.

Resource limits set by ulimit are inherited by any processes spawned from
the shell. They also affect the shell itself, but a shell process
shouldn't require a lot of resources. You can use a subshell if you want
to impose limits on a specific process.

For Python, setting the limit on virtual memory (RAM + swap) to no more
than the amount of physical RAM is probably a wise move. Some processes
can use swap effectively, but the typical Python program probably can't.
There are exceptions, e.g. if most of the memory is accounted for by large
NumPy arrays and you're careful about the operations which are performed
upon them. But using large amounts of memory for many small objects is
almost bound to result in swap-thrashing.

One problem with doing this automatically (e.g. in .pythonrc) is the
inheritance issue; any processes spawned from the interpreter will also be
resource limited. Similarly, any binary libraries loaded into the
interpreter will be subject to the process' resource limits. Consequently,
there would be some advantages to the Python interpreter having its own
resource-limiting mechanism.



From ssegvic at zemris.fer.hr  Mon Sep 12 08:45:38 2011
From: ssegvic at zemris.fer.hr (=?utf-8?Q?Sini=C5=A1a_=C5=A0egvi=C4=87?=)
Date: Mon, 12 Sep 2011 14:45:38 +0200 (CEST)
Subject: Portable locale usage
In-Reply-To: <4E69DEE8.9050803@shopzeus.com>
Message-ID: <1616916126.29418.1315831538309.JavaMail.root@mail.zemris.fer.hr>

> From: "Laszlo Nagy" <gandalf at shopzeus.com>
> To: "Sini?a ?egvi?" <ssegvic at zemris.fer.hr>, python-list at python.org
> Sent: Friday, September 9, 2011 11:39:52 AM
> Subject: Re: Portable locale usage
> 
> Looks like you have found a bug! :-) Why don't you post a bug report?

I just did:

http://bugs.python.org/issue12964

Thanks everyone for helping me to sort this out!

Sinisa


From rosuav at gmail.com  Mon Sep 12 08:49:48 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 12 Sep 2011 22:49:48 +1000
Subject: Terminating an embedded interpreter
In-Reply-To: <qc81k8-lhm.ln1@satorlaser.homedns.org>
References: <j211k8-n6i.ln1@satorlaser.homedns.org>
	<mailman.1026.1315823930.27778.python-list@python.org>
	<qc81k8-lhm.ln1@satorlaser.homedns.org>
Message-ID: <CAPTjJmrH_HuA=7XeB-edAKyByXJ=VBn3842+X-uzEiKBtvx--A@mail.gmail.com>

On Mon, Sep 12, 2011 at 10:05 PM, Ulrich Eckhardt
<ulrich.eckhardt at dominolaser.com> wrote:
> Chris Angelico wrote:
>> You can use PyErr_SetInterrupt to raise KeyboardInterrupt
>
> This sounds useful. Just to make sure, this would be called from a different
> thread than the one running the Python script, is that still OK?
>
>> , but it can be caught by the script. There's no guaranteed way,
>> short of killing the process.
>
> This will do for my plans, I'm not trying to defend against anything
> malicious.

Yes, that would be what you want then. The main thing to take care of
is a blanket 'except' that doesn't specify what it's accepting - it'll
snarf the KeyboardInterrupt and carry on its merry way.

ChrisA


From duncan.booth at invalid.invalid  Mon Sep 12 09:06:47 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 12 Sep 2011 13:06:47 GMT
Subject: Idioms combining 'next(items)' and 'for item in items:'
References: <mailman.944.1315683474.27778.python-list@python.org>
Message-ID: <Xns9F5E8F6211D03duncanbooth@127.0.0.1>

Terry Reedy <tjreedy at udel.edu> wrote:

> The statement containing the explicit next(items) call can optionally be 
> wrapped to explicitly handle the case of an empty iterable in whatever 
> manner is desired.
> 
> try:
>      <set up with next(items)>
> except StopIteration:
>      raise ValueError("iterable cannot be empty")
> 
> 
Alternatively, if all you want is for an empty iterable to do nothing, you 
could write it like this:

    items = iter(iterable)
    for first in items:
        <process first>
        break
    for item in items:
        <process non-first>

However, the issue I have with any of this pulling the first element out of 
the loop is that if you want special processing for the first element you 
are likely to also want it for the last, and if it is a single item you need 
to process that item with both bits of special code. I don't see how that works 
unless you have all elements within the single loop and test for first/last.

> 2. Process the last item of an iterable differently. As far as I know, 
> this cannot be done for a generic iterable with a flag. It requires a 
> look ahead.

I think that must be correct, e.g. if reading from an interactive prompt you 
cannot detect end of input until you fail to read any more.

See my answer to http://stackoverflow.com/questions/7365372/is-there-a-pythonic-way-of-knowing-when-the-first-and-last-loop-in-a-for-is-being/7365552#7365552
for a generator that wraps the lookahead.

-- 
Duncan Booth http://kupuguy.blogspot.com


From miki.tebeka at gmail.com  Mon Sep 12 09:23:09 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 06:23:09 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <mailman.1016.1315813775.27778.python-list@python.org>
References: <mailman.1016.1315813775.27778.python-list@python.org>
Message-ID: <b773fdcd-3878-44c6-8f2c-2dd61cd6a704@glegroupsg2000goo.googlegroups.com>

You can add "# coding=UTF8" to the top of your file (see http://www.python.org/dev/peps/pep-0263/).

Of you want to remove unicode, there are several options, one of them is passing the file through "iconv --to ascii".


From miki.tebeka at gmail.com  Mon Sep 12 09:23:09 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 06:23:09 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <mailman.1016.1315813775.27778.python-list@python.org>
References: <mailman.1016.1315813775.27778.python-list@python.org>
Message-ID: <b773fdcd-3878-44c6-8f2c-2dd61cd6a704@glegroupsg2000goo.googlegroups.com>

You can add "# coding=UTF8" to the top of your file (see http://www.python.org/dev/peps/pep-0263/).

Of you want to remove unicode, there are several options, one of them is passing the file through "iconv --to ascii".


From j.reid at mail.cryst.bbk.ac.uk  Mon Sep 12 10:03:40 2011
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Mon, 12 Sep 2011 15:03:40 +0100
Subject: Easiest framework to develop simple interactive web site in python?
Message-ID: <j4l3ft$p6l$1@dough.gmane.org>

Hi,

I need to write a web interface for some computational biology software 
I've written:
http://sysbio.mrc-bsu.cam.ac.uk/johns/STEME/rst/_build/html/index.html

I don't have much experience writing web sites or applications. Can 
anyone recommend a python framework that will allow me to easily write a 
few pages? I need to accept some user input in the form of some options 
and download a potentially large file from the user's computer. The job 
can take some time to run so I'll need to notify them via email when it 
has finished.

I should say our group already uses an Apache web server so I'd like to 
host the pages from that server.

I know there are various python web frameworks but I don't want to learn 
a complicated one, I really just want the simplest tool for the job. Are 
any of the following suitable?

Zope, Django, Pylons, Grok, Pyramid

I see quite a few are listed here:
http://wiki.python.org/moin/WebFrameworks

Thanks in advance for any help,
John.



From stefan_ml at behnel.de  Mon Sep 12 10:10:44 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 12 Sep 2011 16:10:44 +0200
Subject: working with a large file
In-Reply-To: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
References: <CAOF-KfhdAx=HppPy5SFrWRrgsaYxWAkO0YH=WjpBSY3_wBAXqw@mail.gmail.com>
Message-ID: <j4l3t4$qub$1@dough.gmane.org>

Rita, 12.09.2011 12:34:
> I have a large file, 18gb uncompressed, and I would like to know what is the
> preferred method to read this file for random access. I have several
> processes reading the file which different calculate arguments. My server
> has 64gb of memory. Not sure what is the preferred way to do this?

It depends on the content (and likely also the operating system), but you 
might want to take a look at the mmap module.

Stefan



From wxjmfauth at gmail.com  Mon Sep 12 10:39:22 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Mon, 12 Sep 2011 07:39:22 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<mailman.1018.1315815474.27778.python-list@python.org>
Message-ID: <55455989-d2bf-44d6-b3cf-ba50f1e87a01@d14g2000yqb.googlegroups.com>

On 12 sep, 10:17, Gary Herron <gher... at islandtraining.com> wrote:
> On 09/12/2011 12:49 AM, Alec Taylor wrote:
>
>
>
> > Good evening,
>
> > I have converted ODT to HTML using LibreOffice Writer, because I want
> > to convert from HTML to Creole using python-creole. Unfortunately I
> > get this error: "File "Convert to Creole.py", line 17
> > SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> > on line 18, but no encoding declared; see
> >http://www.python.org/peps/pep-0263.htmlfor details".
>
> > Unfortunately I can't post my document yet (it's a research paper I'm
> > working on), but I'm sure you'll get the same result if you write up a
> > document in LibreOffice Writer and add some End Notes.
>
> > How do I automate the removal of all non-ascii characters from my code?
>
> > Thanks for all suggestions,
>
> > Alec Taylor
>

The coding of the characters is a domain per se.
It is independent from any OS's or applications.

When working with (plain) text files, you should
always be aware about the coding of the text you
are working on. If you are using coding directives,
you must ensure your coding directive matches
the real coding of the text files. A coding
directive is only informative, it does not set
the coding.

I'm pretty sure, you problem comes from this. There
is a mismatch somewhere, you are not aware of.
Removing ascii chars is certainly not a valuable
solution. It must work. If your are working
properly, it can not, not work.

Frome a linguistic point of view, the web has informed
me Creole (*all the Creoles*) can be composed with
the iso-8859-1 coding. That means, iso-8859-1, cp1252 and
all Unicode coding variants are possible coding directives.

jmf



From ericsnowcurrently at gmail.com  Mon Sep 12 10:44:01 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Mon, 12 Sep 2011 08:44:01 -0600
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
Message-ID: <CALFfu7DY3SJHO-U_a6ynbMrHNTQek6xtjSfV0=zZgmK8drtiMg@mail.gmail.com>

On Mon, Sep 12, 2011 at 1:49 AM, Alec Taylor <alec.taylor6 at gmail.com> wrote:
> Good evening,
>
> I have converted ODT to HTML using LibreOffice Writer, because I want
> to convert from HTML to Creole using python-creole. Unfortunately I
> get this error: "File "Convert to Creole.py", line 17
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 18, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details".
>
> Unfortunately I can't post my document yet (it's a research paper I'm
> working on), but I'm sure you'll get the same result if you write up a
> document in LibreOffice Writer and add some End Notes.
>
> How do I automate the removal of all non-ascii characters from my code?

Perhaps try "The Unicode Hammer".

http://code.activestate.com/recipes/251871/

-eric

>
> Thanks for all suggestions,
>
> Alec Taylor
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From wxjmfauth at gmail.com  Mon Sep 12 10:47:00 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Mon, 12 Sep 2011 07:47:00 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>

On 12 sep, 10:49, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
>
> Even with a source code encoding, you will probably have problems with
> source files including \xe2 and other "bad" chars. Unless they happen to
> fall inside a quoted string literal, I would expect to get a SyntaxError.
>

This is absurd and a complete non sense. The purpose
of a coding directive is to inform the engine, which
is processing a text file, about the "language" it
has to speak. Can be a html, py or tex file.
If you have problem, it's probably a mismatch between
your coding directive and the real coding of the
file. Typical case: ascii/utf-8 without signature.

jmf


From bestenborstel at gmail.com  Mon Sep 12 10:51:45 2011
From: bestenborstel at gmail.com (G.)
Date: Mon, 12 Sep 2011 07:51:45 -0700 (PDT)
Subject: Could you please give me some advise on this piece of code?
Message-ID: <cbfa6221-5a94-4fba-b5dd-3fe45789aad1@dq7g2000vbb.googlegroups.com>

Dear all,
I am a python newbie, but I intend to program a python script that
communicates with Labview via a UDP socket.
I managed to send LabView strings, but the other way around is not
working.
The code seems to stop working while in the first while loop. I can
see the word "test" being print out.

When I start LabView UDP_sender.vi it is supposed to send a string
back to python, but sometimes it ends with an error saying the port
and the ip is already in usage. Do I have to start first LabView or
the python scrip when listening to LabView, please?

It would be great if you could have a look on my code and could maybe
see why it does nothing after "print test", please.

Thank you very much.

Kind regards,
G.



# To change this template, choose Tools | Templates
# and open the template in the editor.

__author__="User"
__date__ ="$11.09.2011 19:34:03$"

if __name__ == "__main__":
    print "Das ist ein Test"

import socket
import time

#Define global variables for UDP_IP and UDP_Port, needs to be changed
for PETRA-3
#global UDP_IP
UDP_IP="127.0.0.1"
print "UDP_IP is", UDP_IP

#global UDP_PORT
UDP_PORT=21312
print "UDP_PORT is", UDP_PORT





def openUDPSocket(UDP_IP,UDP_PORT):
    #UDP_IP="127.0.0.1"
    #UDP_PORT=5005
    print "Creating socket ..."
    sock=socket.socket( socket.AF_INET, # Internet
                        socket.SOCK_DGRAM ) # UDP
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    #sock.setblocking(0)
    #sock.bind((UDP_IP,UDP_PORT))
    #sock.listen(1)
    print "Done."
    return sock

def fastPump(sock):
    # Start pumping and return
    MESSAGE="pumpfast"

   # print "UDP target IP:", UDP_IP
   # print "UDP target port:", UDP_PORT
   # print "message:", MESSAGE

    sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )

def slowPump(sock):
    MESSAGE="pumpslow"
    sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )


pumpsocketUDP=openUDPSocket(UDP_IP,UDP_PORT)


# Receive messages
counter_while_loop=0
print "test"
while counter_while_loop < 3:
	data,addr = pumpsocketUDP.recvfrom(1024)
        print "test"
	if not data:
		print "Client has exited!"
		break
	else:
		print "\nReceived message '", data,"'"
        counter_while_loop=counter_while_loop+1


counter_while_loop=0

while counter_while_loop < 3:
    fastPump(pumpsocketUDP)
    time.sleep(5)
    slowPump(pumpsocketUDP)
    time.sleep(3)

    counter_while_loop=counter_while_loop+1
    print "Counter_while_loop", counter_while_loop


# Close socket
pumpsocketUDP.close()


From w.brenig at tu-bs.de  Mon Sep 12 11:39:35 2011
From: w.brenig at tu-bs.de (Wolfram Brenig)
Date: Mon, 12 Sep 2011 17:39:35 +0200
Subject: ipython -wthread vs.  ipython -pylab
Message-ID: <9d6n9cFs53U1@mid.dfncis.de>

Hi,

I have a problem with the ipython shell: frequently, within one session 
I would like to do 2D plotting, using  matplotlib, as well as 3D 
visualization using mayavi

The man page for ipython, matplotlib, and mayavi tell me, that I must 
invoke ipython with
ipython -wthread for mayavi and
ipython -pylab for matplotlib
in order to avoid blocking (which indeed happens if I don't
use those options).
However, ipython's manpage also states, that only one of -wthread or 
-pylab can be given?

Does that imply I have to get out of the shell each time I want to 
switch from matplotlib to mayavi usage? Most likely no. But what should 
I do?

Thanks for your help

Wolfram


From matthias.huening at fu-berlin.de  Mon Sep 12 11:42:56 2011
From: matthias.huening at fu-berlin.de (Matthias Huening)
Date: Mon, 12 Sep 2011 17:42:56 +0200
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <9d6nk0FutiU1@mid.uni-berlin.de>

Am 12.09.2011 16:03, schrieb John Reid:
>
> I don't have much experience writing web sites or applications. Can
> anyone recommend a python framework that will allow me to easily write a
> few pages?

You want a simple framework? Try Bottle:
http://bottlepy.org/

Matthias


From Phillip.M.Feldman at gmail.com  Mon Sep 12 11:47:22 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Mon, 12 Sep 2011 08:47:22 -0700 (PDT)
Subject: recursive algorithm for balls in numbered boxes
In-Reply-To: <a3b7c177-944c-4d86-9329-0a88fd410c67@y21g2000yqk.googlegroups.com>
References: <32440187.post@talk.nabble.com>
	<a3b7c177-944c-4d86-9329-0a88fd410c67@y21g2000yqk.googlegroups.com>
Message-ID: <32449079.post@talk.nabble.com>



Mark Dickinson-2 wrote:
> 
> 
> This is a well-known trick:  to divide 5 (unlabeled) balls amongst 3
> (labeled) boxes, you write down sequences of 5 o's and 2 x's, where
> the o's represent the 5 balls and the 'x's represent dividers:
> 
>     ooxooxo  -> [2, 2, 1]
>     xoooxoo  -> [0, 3, 2]
> 
> And 'combinations(7, 2)' yields successively all the possible
> different placements for the 2 dividers in the 7 symbols.
> 
> 
> This question seems to come up often enough (without the box size
> limit twist) that maybe it would be useful to include something like
> this recipe in the itertool documentation.
> 
> 
> For getting this into itertools, I'd suggest opening a feature request
> on bugs.python.org and assigning it to Raymond Hettinger.
> 
> --
> Mark
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

You are correct--the case without capacity limits can be handled using the
existing machinery in `itertools`.  BTW--That trick with the dividers is
discussed on page 38 of William Feller's classic text, "An Introduction to
Probability Theory and Its Applications".

As per your suggestion, I have opened a feature request and assigned it to
Raymond.  Thanks!
-- 
View this message in context: http://old.nabble.com/recursive-algorithm-for-balls-in-numbered-boxes-tp32440187p32449079.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From miki.tebeka at gmail.com  Mon Sep 12 12:48:42 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 09:48:42 -0700 (PDT)
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <c138a13f-6834-4dc2-bfcb-0c794e6c9234@glegroupsg2000goo.googlegroups.com>

I personally like CherryPy. But it all depends on your needs and style. I suggest you play with some of the packages and select one that you feel best with.


From miki.tebeka at gmail.com  Mon Sep 12 12:48:42 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Mon, 12 Sep 2011 09:48:42 -0700 (PDT)
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <c138a13f-6834-4dc2-bfcb-0c794e6c9234@glegroupsg2000goo.googlegroups.com>

I personally like CherryPy. But it all depends on your needs and style. I suggest you play with some of the packages and select one that you feel best with.


From ian.g.kelly at gmail.com  Mon Sep 12 12:55:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 12 Sep 2011 10:55:14 -0600
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <j4jknm$cpd$1@dough.gmane.org>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
	<j4jknm$cpd$1@dough.gmane.org>
Message-ID: <CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>

On Sun, Sep 11, 2011 at 6:45 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> whereas, you are right, it breaks it noisily in the body. So Ian's claim
> that StopIteration must be caught to avoid silent termination is not true.
> Thanks for pointing out what I saw but did not cognize the full implication
> of before. A better exception and an error message with an explaination
> might still be a good idea, though.

But you can't write the function under the assumption that it will
only be called from the function body.  The following is a slight
reorganization of your example that does exhibit the problem:

for title in map(fix_title, ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']):
    print(title)

Output:
amazing
a Hell of a Fight

Note that at first glance, my example would appear to be functionally
equivalent to yours -- I've merely pulled the fix_title call out of
the loop body and into the iterator.  But actually they produce
different results because fix_title misbehaves by not catching the
StopIteration.

Cheers,
Ian


From ian.g.kelly at gmail.com  Mon Sep 12 12:58:05 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 12 Sep 2011 10:58:05 -0600
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
	<j4jknm$cpd$1@dough.gmane.org>
	<CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
Message-ID: <CALwzidnPXzdf1ee9SY_61cs+AjbkTbAgqywX5pdqfcaTH1+x=A@mail.gmail.com>

On Mon, Sep 12, 2011 at 10:55 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> But you can't write the function under the assumption that it will
> only be called from the function body. ?The following is a slight
> reorganization of your example that does exhibit the problem:

s/function body/for-loop body/


From ian.g.kelly at gmail.com  Mon Sep 12 13:41:06 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 12 Sep 2011 11:41:06 -0600
Subject: Could you please give me some advise on this piece of code?
In-Reply-To: <cbfa6221-5a94-4fba-b5dd-3fe45789aad1@dq7g2000vbb.googlegroups.com>
References: <cbfa6221-5a94-4fba-b5dd-3fe45789aad1@dq7g2000vbb.googlegroups.com>
Message-ID: <CALwzidmVD+3EySCHjgjC97AQ=wGWMN6Bvj8+4-4uVCO8-9sbwQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 8:51 AM, G. <bestenborstel at gmail.com> wrote:
> When I start LabView UDP_sender.vi it is supposed to send a string
> back to python, but sometimes it ends with an error saying the port
> and the ip is already in usage. Do I have to start first LabView or
> the python scrip when listening to LabView, please?

If LabView is sending, then the Python script should already be
receiving, so start Python first.

> def openUDPSocket(UDP_IP,UDP_PORT):
> ? ?#UDP_IP="127.0.0.1"
> ? ?#UDP_PORT=5005
> ? ?print "Creating socket ..."
> ? ?sock=socket.socket( socket.AF_INET, # Internet
> ? ? ? ? ? ? ? ? ? ? ? ?socket.SOCK_DGRAM ) # UDP

I don't think this is sufficient to create a UDP socket.  To be safe,
you should specify the protocol as well:

sock = socket.socket(socket.AF_INET,
    socket.SOCK_DGRAM, socket.IPPROTO_UDP)

> ? ?#sock.bind((UDP_IP,UDP_PORT))

Your bind call is commented out, which means that your socket will be
bound to an arbitrary port selected by the OS.  This will make it hard
for LabView to send it messages, since it won't know what port to use.

Also, you appear to be using the same address and port for both
endpoints.  The UDP socket in Python and the UDP socket in LabView
should be bound to two separate ports.  This is probably why you were
getting the "port already in use" error, before you commented this
out.

> ? ?#sock.listen(1)

You don't need this at all.  listen() is for TCP sockets.

> def fastPump(sock):
> ? ?# Start pumping and return
> ? ?MESSAGE="pumpfast"
>
> ? # print "UDP target IP:", UDP_IP
> ? # print "UDP target port:", UDP_PORT
> ? # print "message:", MESSAGE
>
> ? ?sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )

The IP and port here should be that of the destination, i.e. the
address of the LabView socket.

> counter_while_loop=0
> print "test"
> while counter_while_loop < 3:
> ? ? ? ?data,addr = pumpsocketUDP.recvfrom(1024)
> ? ? ? ?print "test"
> ? ? ? ?if not data:
> ? ? ? ? ? ? ? ?print "Client has exited!"
> ? ? ? ? ? ? ? ?break
> ? ? ? ?else:
> ? ? ? ? ? ? ? ?print "\nReceived message '", data,"'"
> ? ? ? ?counter_while_loop=counter_while_loop+1

You should really use a for loop here:

for counter in range(3):
    data, addr = pumpsocketUPD.recvfrom(1024)
    print "Received message %r" % data

Note that if data is empty, it means that it received an empty
message, not that the client has exited.  It may be that you're having
the LabView client send an empty message when it exits, but this does
not happen automatically.

HTH,
Ian


From pruebauno at latinmail.com  Mon Sep 12 13:42:35 2011
From: pruebauno at latinmail.com (nn)
Date: Mon, 12 Sep 2011 10:42:35 -0700 (PDT)
Subject: convert time
References: <mailman.970.1315716418.27778.python-list@python.org>
	<4e6c4088$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <d4e6f206-d8ee-4fd4-bb72-c41dbf27cc43@fe21g2000vbb.googlegroups.com>

On Sep 11, 1:00?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> ???? wrote:
> > how can i convert "Dec 11" into ?2011-12?
>
> if my_str == "Dec 11":
> ? ? return 1999 ?# 2011 - 12
>
> Does that help?
>
> But seriously... 2011-12 is not a proper date, so the simplest way is
> probably something like this:
>
> def convert(date_str):
> ? ? month, short_year = date_str.split()
> ? ? if len(short_year) == 4:
> ? ? ? ? year = short_year
> ? ? else:
> ? ? ? ? year = '20' + short_year
> ? ? months = 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec'.split()
> ? ? month = months.index(month) + 1
> ? ? return year + '-' + str(month)
>
> Otherwise see the time and datetime modules:
>
> http://docs.python.org/library/time.htmlhttp://docs.python.org/library/datetime.html
>
> --
> Steven

Just a small comment that you can get "months" by doing:

from calendar import month_abbr
months = list(month_abbr)


From stefaan.himpe at gmail.com  Mon Sep 12 14:37:49 2011
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Mon, 12 Sep 2011 20:37:49 +0200
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <mailman.1034.1315836239.27778.python-list@python.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
Message-ID: <1ksbq.2549$ex3.1130@newsfe30.ams2>

The simplest one to learn is web2py http://www.web2py.com
No configuration needed, just unpack and get started.
It also has very good documentation and tons of little examples to get 
things done.

The other options you mentioned are good too :)



From tjreedy at udel.edu  Mon Sep 12 15:24:14 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 15:24:14 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <Xns9F5E8F6211D03duncanbooth@127.0.0.1>
References: <mailman.944.1315683474.27778.python-list@python.org>
	<Xns9F5E8F6211D03duncanbooth@127.0.0.1>
Message-ID: <j4lm90$8nk$1@dough.gmane.org>

On 9/12/2011 9:06 AM, Duncan Booth wrote:
> Terry Reedy<tjreedy at udel.edu>  wrote:
>
>> The statement containing the explicit next(items) call can optionally be
>> wrapped to explicitly handle the case of an empty iterable in whatever
>> manner is desired.
>>
>> try:
>>       <set up with next(items)>
>> except StopIteration:
>>       raise ValueError("iterable cannot be empty")
>>
>>
> Alternatively, if all you want is for an empty iterable to do nothing,

To do nothing, just pass above. If the function does nothing, it returns 
None. In the fix_title function, it should return '', not None.

> you could write it like this:
>
>      items = iter(iterable)
>      for first in items:
>          <process first>
>          break

I could, but I doubt I would ;-). Try...except StopIteration: pass is 
more explicit and less roundabout.

>      for item in items:
>          <process non-first>
>
> However, the issue I have with any of this pulling the first element out of
> the loop is that if you want special processing for the first element you
> are likely to also want it for the last,

Likely? I would say occasionally. Sentences have first words; file have 
headers. Special processing for last items is only an issue if it 
*replaces* the normal processing, rather than following the normal 
processing.

 > and if it is a single item you need
> to process that item with both bits of special code. I don't see how that works
> unless you have all elements within the single loop and test for first/last.

Like so, with tests:

def first_last_special(iterable):
     print("\nIterable is",repr(iterable))
     items = iter(iterable)
     try:
         first = next(items)
     except StopIteration:
         print('Nothing'); return
     print(first, 'is the first item')
     try:
         current = next(items)
     except StopIteration:
         current = first
     else:
         for item in items:
             print(current, 'is a middle item')
             current = item
     print(current, 'is the last item')

first_last_special('')
first_last_special('1')
first_last_special('12')
first_last_special('123')
first_last_special('12345')

-- 
Terry Jan Reedy



From georgeryoung at gmail.com  Mon Sep 12 15:49:51 2011
From: georgeryoung at gmail.com (gry)
Date: Mon, 12 Sep 2011 12:49:51 -0700 (PDT)
Subject: Python: Deleting specific words from a file.
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
	<mailman.898.1315548327.27778.python-list@python.org>
Message-ID: <22e15921-d543-4604-8996-3bcb2770ef18@et6g2000vbb.googlegroups.com>

On Sep 9, 2:04?am, Terry Reedy <tjre... at udel.edu> wrote:
> On 9/8/2011 9:09 PM, papu wrote:
>
>
>
> > Hello, I have a data file (un-structed messy file) from which I have
> > to scrub specific list of words (delete words).
>
> > Here is what I am doing but with no result:
>
> > infile = "messy_data_file.txt"
> > outfile = "cleaned_file.txt"
>
> > delete_list = ["word_1","word_2"....,"word_n"]
> > new_file = []
> > fin=open(infile,"")
> > fout = open(outfile,"w+")
> > for line in fin:
> > ? ? ?for word in delete_list:
> > ? ? ? ? ?line.replace(word, "")
> > ? ? ?fout.write(line)
> > fin.close()
> > fout.close()
>
> If you have very many words (and you will need all possible forms of
> each word if you do exact matches), The following (untested and
> incomplete) should run faster.
>
> delete_set = {"word_1","word_2"....,"word_n"}
> ...
> for line in fin:
> ? ? ?for word in line.split()
> ? ? ? ? ?if word not in delete_set:
> ? ? ? ? ? ? ?fout.write(word) # also write space and nl.
>
> Depending on what your file is like, you might be better with
> re.split('(\W+)', line). An example from the manual:
> ?>>> re.split('(\W+)', '...words, words...')
> ['', '...', 'words', ', ', 'words', '...', '']
>
> so all non-word separator sequences are preserved and written back out
> (as they will not match delete set).
>
> --
> Terry Jan Reedy

re.sub is handy too:
import re
delete_list=('the','rain','in','spain')
regex =  re.compile('\W' + '|'.join(delete_list) + '\W')
infile='messy'
with open(infile, 'r') as f:
    for l in f:
        print regex.sub('', l)


From python at mrabarnett.plus.com  Mon Sep 12 16:42:21 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 12 Sep 2011 21:42:21 +0100
Subject: Python: Deleting specific words from a file.
In-Reply-To: <22e15921-d543-4604-8996-3bcb2770ef18@et6g2000vbb.googlegroups.com>
References: <30f9b718-bb3c-4c92-8a03-0f760c993939@a12g2000yqi.googlegroups.com>
	<mailman.898.1315548327.27778.python-list@python.org>
	<22e15921-d543-4604-8996-3bcb2770ef18@et6g2000vbb.googlegroups.com>
Message-ID: <4E6E6EAD.5040306@mrabarnett.plus.com>

On 12/09/2011 20:49, gry wrote:
> On Sep 9, 2:04 am, Terry Reedy<tjre... at udel.edu>  wrote:
>> On 9/8/2011 9:09 PM, papu wrote:
>>
>>
>>
>>> Hello, I have a data file (un-structed messy file) from which I have
>>> to scrub specific list of words (delete words).
>>
>>> Here is what I am doing but with no result:
>>
>>> infile = "messy_data_file.txt"
>>> outfile = "cleaned_file.txt"
>>
>>> delete_list = ["word_1","word_2"....,"word_n"]
>>> new_file = []
>>> fin=open(infile,"")
>>> fout = open(outfile,"w+")
>>> for line in fin:
>>>       for word in delete_list:
>>>           line.replace(word, "")
>>>       fout.write(line)
>>> fin.close()
>>> fout.close()
>>
>> If you have very many words (and you will need all possible forms of
>> each word if you do exact matches), The following (untested and
>> incomplete) should run faster.
>>
>> delete_set = {"word_1","word_2"....,"word_n"}
>> ...
>> for line in fin:
>>       for word in line.split()
>>           if word not in delete_set:
>>               fout.write(word) # also write space and nl.
>>
>> Depending on what your file is like, you might be better with
>> re.split('(\W+)', line). An example from the manual:
>>   >>>  re.split('(\W+)', '...words, words...')
>> ['', '...', 'words', ', ', 'words', '...', '']
>>
>> so all non-word separator sequences are preserved and written back out
>> (as they will not match delete set).
>>
>> --
>> Terry Jan Reedy
>
> re.sub is handy too:
> import re
> delete_list=('the','rain','in','spain')
> regex =  re.compile('\W' + '|'.join(delete_list) + '\W')

You need parentheses around the words (I'm using non-capturing
parentheses):

regex =  re.compile(r'\W(?:' + '|'.join(delete_list) + r')\W')

otherwise you'd get: '\Wthe|rain|in|spain\W'.

Even better is the word-boundary, in case there's no previous or next
character:

regex =  re.compile(r'\b(?:' + '|'.join(delete_list) + r')\b')

Raw string literals are recommended for regexes.

> infile='messy'
> with open(infile, 'r') as f:
>      for l in f:
>          print regex.sub('', l)


From tjreedy at udel.edu  Mon Sep 12 16:51:01 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 16:51:01 -0400
Subject: Idioms combining 'next(items)' and 'for item in items:'
In-Reply-To: <CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
References: <j4gea4$m3b$1@dough.gmane.org>
	<CALwzidkeRA69p+Vw80xnE_sndx64zr2yXQsFZhS520KYbjxTxA@mail.gmail.com>
	<j4iomc$te4$1@dough.gmane.org>
	<CAPTjJmrXNjoccWAjwPO7yGHjQsruvJ7Kn6WWum6ywwWd+GZpoQ@mail.gmail.com>
	<j4jknm$cpd$1@dough.gmane.org>
	<CALwzidnPj4rLpyk3NvogZshQd8y2rJnKrii47-5_N8FNBKf8Hg@mail.gmail.com>
Message-ID: <j4lrbn$dqa$1@dough.gmane.org>

On 9/12/2011 12:55 PM, Ian Kelly wrote:
> On Sun, Sep 11, 2011 at 6:45 PM, Terry Reedy<tjreedy at udel.edu>  wrote:
>> whereas, you are right, it breaks it noisily in the body. So Ian's claim
>> that StopIteration must be caught to avoid silent termination is not true.
>> Thanks for pointing out what I saw but did not cognize the full implication
>> of before. A better exception and an error message with an explaination
>> might still be a good idea, though.
>
> But you can't write the function under the assumption that it will
> only be called from the function body.

Sigh. You are right.

>  The following is a slight
> reorganization of your example that does exhibit the problem:
>
> for title in map(fix_title, ['amazinG', 'a helL of a fiGHT', '', 'igNordEd']):
>      print(title)
>
> Output:
> amazing
> a Hell of a Fight
>
> Note that at first glance, my example would appear to be functionally
> equivalent to yours -- I've merely pulled the fix_title call out of
> the loop body and into the iterator.  But actually they produce
> different results because fix_title misbehaves by not catching the
> StopIteration.

You are right, non-iterators should not raise or pass on StopIteration. 
There are actually several reasons.

1. The manual defined StopIteration as meaning '[I have] no more values 
[to give you]'. This is only meaningful coming from an iterator.

2. Your particular point is that StopIteration is (almost) unique in 
being sometimes, but only sometimes, caught by the interpreter, rather 
than just by user except clauses. AttributeError is another, which has 
occasionally caused its own problems. But we cannot stop raising 
AttributeError while we can always catch StopIteration for explicit 
next() (and should outside of iterators).

3. In the case of grabbing the first item from an iterator, no first 
item is a boundary case for the expected, legal type of input. I believe 
boundary cases should be included in function specifications. While 
there may be a couple of choices as to response, that is much less than 
infinity. For fix_title, the choices are ValueError or ''. Any other 
return would be an error unless explicitly given in the specs. So the 
boundary case should be included in the test suite to exclude any other 
random response.

4. StopIteration is an artifact of the choice of implementation. Pulling 
the first item out before the loop is an alternative to a flag and 
testing within the loop. Such an implementation detail should not leak 
into the user's view of the function as an abstraction.

If fix_title were a generator function whose instances yielded fixed 
title words one at a time, then the bare next() would be correct (as you 
noted). But it is not, and the difference is important, more important 
than having 'minimal clean code'. Thank you for persisting until I saw 
that in this context.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep 12 16:53:24 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 16:53:24 -0400
Subject: PC locks up with list operations
In-Reply-To: <roy-748F48.07400012092011@news.panix.com>
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<4e6dc66e$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<roy-748F48.07400012092011@news.panix.com>
Message-ID: <j4lrg5$dqa$2@dough.gmane.org>

On 9/12/2011 7:40 AM, Roy Smith wrote:
> In article<4e6dc66e$0$29986$c3e8da3$5496439d at news.astraweb.com>,
>   Steven D'Aprano<steve+comp.lang.python at pearwood.info>  wrote:
>
>>> mylist = [0]*12345678901234
>> [...]
>>> Apart from "Then don't do that!", is there anything I can do to prevent
>>> this sort of thing in the future? Like instruct Python not to request more
>>> memory than my PC has?
>>
>>
>> For anyone who may care, I can report that ulimit under Linux will help with
>> this situation.
>> [...]
>> Does anyone else think it would be useful for Python's memory manager to
>> enforce user-settable limits?
>
> Not me.  You've already discovered that ulimit does exactly what you
> want.  Why would be gained by having Python duplicate this functionality?

Having it on Windows.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Mon Sep 12 17:04:50 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 12 Sep 2011 17:04:50 -0400
Subject: What do you guys think about adding a method "to_json"
In-Reply-To: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
References: <CAHowWJkzOr30FU1XDZ74rD1qJxYxteT+q2TbD9E4GZ+Js7dA7g@mail.gmail.com>
Message-ID: <j4ls5k$jk2$1@dough.gmane.org>

On 9/12/2011 12:34 AM, Juan Pablo Romero M?ndez wrote:
> Hello,
>
> What do you guys think about adding a method "to_json" to dictionaries
> and sequence types? Perhaps through a module import?

Negative. If this were added, why not to_yaml, to_marshal, to_pickle, 
to_zip, and so on. Better to have each storage or transfer class handle 
its own instance creation. The one to_x method that every class should 
have is to_string, which is spelled __str__ and inherited from object.

-- 
Terry Jan Reedy




From rhodri at wildebst.demon.co.uk  Mon Sep 12 17:39:41 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 12 Sep 2011 22:39:41 +0100
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
Message-ID: <op.v1ps4fqia8ncjz@gnudebst>

On Mon, 12 Sep 2011 15:47:00 +0100, jmfauth <wxjmfauth at gmail.com> wrote:

> On 12 sep, 10:49, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
>>
>> Even with a source code encoding, you will probably have problems with
>> source files including \xe2 and other "bad" chars. Unless they happen to
>> fall inside a quoted string literal, I would expect to get a  
>> SyntaxError.
>>
>
> This is absurd and a complete non sense. The purpose
> of a coding directive is to inform the engine, which
> is processing a text file, about the "language" it
> has to speak. Can be a html, py or tex file.
> If you have problem, it's probably a mismatch between
> your coding directive and the real coding of the
> file. Typical case: ascii/utf-8 without signature.

Now read what Steven wrote again.  The issue is that the program contains  
characters that are syntactically illegal.  The "engine" can be perfectly  
correctly translating a character as a smart quote or a non breaking space  
or an e-umlaut or whatever, but that doesn't make the character legal!

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


From rantingrick at gmail.com  Mon Sep 12 18:04:15 2011
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 12 Sep 2011 15:04:15 -0700 (PDT)
Subject: PyWart: Itertools module needs attention
Message-ID: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>


############################################################
#                          Quote                           #
############################################################
# The itertools module is great HOWEVER i believe most     #
# people are recreating the functionalities due to the     #
# insanely cryptic and/or missing examples from each       #
# method                                                   #
############################################################

py> print itertools.chain.__doc__
chain(*iterables) --> chain object
Return a chain object whose .next() method returns elements from the
first iterable until it is exhausted, then elements from the next
iterable, until all of the iterables are exhausted.

############################################################
#                          Quote                           #
############################################################
# Okay not TOO bad however this simple example would       #
# suffice:                                                 #
############################################################

py> list(itertools.chain([1,2], [3,[4,5],6]))
[1, 2, 3, [4, 5], 6]

############################################################
#                          Quote                           #
############################################################
# Same for these...                                        #
############################################################

py> ''.join(list(itertools.dropwhile(lambda x:x==" ", "    hello
word    ")))
'hello word    '
py> ''.join(list(itertools.takewhile(lambda x:x==" ", "    hello
word    ")))
'    '
py> print itertools.compress.__doc__
compress(data, selectors) --> iterator over selected data
Return data elements corresponding to true selector elements.
Forms a shorter iterator from selected data elements using the
selectors to choose the data elements.

############################################################
#                          Quote                           #
############################################################
# WTF! Would you like to define a Python "selector". Could #
# it be that we should be using "selector function" or     #
# "predicate function" instead?                            #
############################################################


From nstinemates at gmail.com  Mon Sep 12 18:25:49 2011
From: nstinemates at gmail.com (Nick Stinemates)
Date: Mon, 12 Sep 2011 22:25:49 +0000
Subject: PyWart: Itertools module needs attention
In-Reply-To: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
Message-ID: <CANWvZ3RSUJHTaa8PifE-htO5+L-PvDMDJqJGGrYP67W_m1cOxw@mail.gmail.com>

On Mon, Sep 12, 2011 at 10:04 PM, rantingrick <rantingrick at gmail.com> wrote:

>
> ############################################################
> #                          Quote                           #
> ############################################################
> # The itertools module is great HOWEVER i believe most     #
> # people are recreating the functionalities due to the     #
> # insanely cryptic and/or missing examples from each       #
> # method                                                   #
> ############################################################
>
> py> print itertools.chain.__doc__
> chain(*iterables) --> chain object
> Return a chain object whose .next() method returns elements from the
> first iterable until it is exhausted, then elements from the next
> iterable, until all of the iterables are exhausted.
>
> ############################################################
> #                          Quote                           #
> ############################################################
> # Okay not TOO bad however this simple example would       #
> # suffice:                                                 #
> ############################################################
>
> py> list(itertools.chain([1,2], [3,[4,5],6]))
> [1, 2, 3, [4, 5], 6]
>
> ############################################################
> #                          Quote                           #
> ############################################################
> # Same for these...                                        #
> ############################################################
>
> py> ''.join(list(itertools.dropwhile(lambda x:x==" ", "    hello
> word    ")))
> 'hello word    '
> py> ''.join(list(itertools.takewhile(lambda x:x==" ", "    hello
> word    ")))
> '    '
> py> print itertools.compress.__doc__
> compress(data, selectors) --> iterator over selected data
> Return data elements corresponding to true selector elements.
> Forms a shorter iterator from selected data elements using the
> selectors to choose the data elements.
>
> ############################################################
> #                          Quote                           #
> ############################################################
> # WTF! Would you like to define a Python "selector". Could #
> # it be that we should be using "selector function" or     #
> # "predicate function" instead?                            #
> ############################################################
> --
> http://mail.python.org/mailman/listinfo/python-list


I'm honestly missing the point of this mail.

Can you elaborate?
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From vlastimil.brom at gmail.com  Mon Sep 12 18:49:49 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 13 Sep 2011 00:49:49 +0200
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
Message-ID: <CAHzaPEOjU5GKzE5k5T72mFDVXuS+yp4UPj-dZSurFF6z+-g3xw@mail.gmail.com>

2011/9/12 Alec Taylor <alec.taylor6 at gmail.com>:
> Good evening,
>
> I have converted ODT to HTML using LibreOffice Writer, because I want
> to convert from HTML to Creole using python-creole. Unfortunately I
> get this error: "File "Convert to Creole.py", line 17
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 18, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details".
>
> Unfortunately I can't post my document yet (it's a research paper I'm
> working on), but I'm sure you'll get the same result if you write up a
> document in LibreOffice Writer and add some End Notes.
>
> How do I automate the removal of all non-ascii characters from my code?
>
> Thanks for all suggestions,
>
> Alec Taylor
> --
> http://mail.python.org/mailman/listinfo/python-list
>

It would obviously help to see the content of the line mentioned in
the traceback (and probably its context);
however, that value seems to correspond with ? in some European
encodings, in which case it would probably be part of some quoted
unicode/string literal. (at least in python 2, in python3 it could
also be a name of an object in python code, the traceback seems to be
the same for both cases.)
cf.
>>> print '\xe2'.decode("iso-8859-1")
?
# and likewise for iso-8859-... 1,2,3,4; 9, 10, 14, 15, 16, some
windows- encodings etc.

Possibly (as previouslz suggested) adding the encoding information
like iso-8859-1 or windows-1252 or others depending on other data etc.
at the top of the source file might fix the error. Which would be
certainly preferable to throwing all non ascii data away.
Zou would add e.g.
# -*- coding: iso-8859-1 -*-
as the first or second line of the file.

hth,
 vbr


From ethan at stoneleaf.us  Mon Sep 12 19:29:07 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Mon, 12 Sep 2011 16:29:07 -0700
Subject: PyWart: Itertools module needs attention
In-Reply-To: <CANWvZ3RSUJHTaa8PifE-htO5+L-PvDMDJqJGGrYP67W_m1cOxw@mail.gmail.com>
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
	<CANWvZ3RSUJHTaa8PifE-htO5+L-PvDMDJqJGGrYP67W_m1cOxw@mail.gmail.com>
Message-ID: <4E6E95C3.7010708@stoneleaf.us>

Nick Stinemates wrote:
> I'm honestly missing the point of this mail.


rantingrick is a well-known troll, and doesn't need to have a point.

Please do not feed the troll.

~Ethan~


From 1248283536 at qq.com  Mon Sep 12 23:08:57 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 13 Sep 2011 11:08:57 +0800
Subject: =?gbk?B?u9i4tKO6IHN0cmFuZyB0aGluZzo=?=
Message-ID: <tencent_2E597A88625A5CD96468ACC4@qq.com>

i change  open into open1,it's ok now
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()     
    for row in csv.reader(file):
            (date,open1,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
            print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]


but i want "open"  to be my data field,not  open1  to be my field ,
how can i do?
 
 
------------------ ???? ------------------
???: "Chris Angelico"<rosuav at gmail.com>;
????: 2011?9?6?(???) ??4:22
???: "python-list"<python-list at python.org>; 

??: Re: strang thing:

 
2011/9/6 ???? <1248283536 at qq.com>:
>     file = open(filename,'r')

> when i  add    (date,open,high,low,close,vol,adjclose) = (row[0], row[1],

You're assigning to the name "open", which is shadowing the built-in
of the same name. The second time through the loop, you're not calling
the usual open() function, you're trying to call your string. That's
what your error is telling you.

Hope that helps!

ChrisA
-- 
http://mail.python.org/mailman/listinfo/python-list
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From 1248283536 at qq.com  Mon Sep 12 23:12:03 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 13 Sep 2011 11:12:03 +0800
Subject: =?gbk?B?u9i4tKO6IHN0cmFuZyB0aGluZzo=?=
Message-ID: <tencent_145978174FECFB2B0598BC51@qq.com>

i change  open into open1,it's ok now
import os
import  csv

for  name  in   os.listdir('/tmp/quote/'):
    filename='/tmp/quote/'+name
    file = open(filename,'r')
    file.readline()     
    for row in csv.reader(file):
            (date,open1,high,low,close,vol,adjclose) = (row[0], row[1], row[2], row[3],row[4], row[5], row[6])
            print   row[0], row[1], row[2], row[3],row[4], row[5], row[6]


but i want "open"  to be my data field,not  open1  to be my field ,
how can i do?
 
 
------------------ ???? ------------------
???: "Chris Angelico"<rosuav at gmail.com>;
????: 2011?9?6?(???) ??4:22
???: "python-list"<python-list at python.org>; 

??: Re: strang thing:

 
2011/9/6 ???? <1248283536 at qq.com>:
>     file = open(filename,'r')

> when i  add    (date,open,high,low,close,vol,adjclose) = (row[0], row[1],

You're assigning to the name "open", which is shadowing the built-in
of the same name. The second time through the loop, you're not calling
the usual open() function, you're trying to call your string. That's
what your error is telling you.

Hope that helps!

ChrisA
-- 
http://mail.python.org/mailman/listinfo/python-list
-------------- next part --------------
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From chunuan723 at gmail.com  Mon Sep 12 23:15:10 2011
From: chunuan723 at gmail.com (he sharon)
Date: Mon, 12 Sep 2011 20:15:10 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <14aa0131-2040-456d-9218-0200c968d166@u17g2000prc.googlegroups.com>

our products:

red bull hats:  http://www.popbaseballhats.com/wholesale-113-b0-Red-Bull-Hats.html

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monster energy hats:
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monster energy t shirts:
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and so on.


From steve+comp.lang.python at pearwood.info  Mon Sep 12 23:28:33 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 13 Sep 2011 13:28:33 +1000
Subject: strang thing:
References: <mailman.793.1315297135.27778.python-list@python.org>
Message-ID: <4e6ecde2$0$29965$c3e8da3$5496439d@news.astraweb.com>

(I sent this reply a week ago, but it seems to have disappeared. So trying
again.)


On Tue, 6 Sep 2011 06:18 pm ???? wrote:

> when i ?add ? ?(date,open,high,low,close,vol,adjclose) = (row[0], row[1],
> row[2], row[3],row[4], row[5], row[6]) change the code into

Here you define a new variable called "open", which has the value of row[1].
This shadows (hides) the built-in function also called "open", so later
when you do this:

> ? ? file = open(filename,'r')
> TypeError: 'str' object is not callable

Python uses your string variable "open" instead of the built-in function.

The best solution is to avoid using the name "open", instead call it "open_"
(underscore at the end is the usual convention to avoid shadowing
built-ins). Or "open_value" or any other appropriate name.

Another solution is to save a reference to the open built-in first:

my_open = open
open = "something"
file = my_open("filename", "r")




-- 
Steven



From rosuav at gmail.com  Mon Sep 12 23:42:56 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 13 Sep 2011 13:42:56 +1000
Subject: strang thing:
In-Reply-To: <4e6ecde2$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.793.1315297135.27778.python-list@python.org>
	<4e6ecde2$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmpQ9OeigD-=FF6qmc0K+UV49ecrz4+hBQvCdSPk230ECg@mail.gmail.com>

On Tue, Sep 13, 2011 at 1:28 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> The best solution is to avoid using the name "open", instead call it "open_"
> (underscore at the end is the usual convention to avoid shadowing
> built-ins). Or "open_value" or any other appropriate name.
>

This is why every good programmer keeps a thesaurus handy. I just now
had a "concept collision" on the word 'cancel', and did a quick search
to come up with 'annul' as an alternative. Although in this case I
didn't search my thesaurus, I actually looked for Magic: The Gathering
cards... yeah, I'm a nerd, aren't you? :)

There's lots of synonyms for open, and it's entirely possible that one
will work. Otherwise, Steven's other solution works just fine too, and
you can go humorous with that too:

sesame = open
open = "something"
file = sesame("filename", "r")

ChrisA


From anbumani923 at gmail.com  Tue Sep 13 00:12:39 2011
From: anbumani923 at gmail.com (anbu)
Date: Mon, 12 Sep 2011 21:12:39 -0700 (PDT)
Subject: WANTED FRESHER IT,CSC,CIVIL,MECH
Message-ID: <d5550f6e-b839-4330-8889-2e04a59dc18f@e34g2000pri.googlegroups.com>

 http://123maza.com/65/cute540/


From sillyousu at gmail.com  Tue Sep 13 00:20:54 2011
From: sillyousu at gmail.com (sillyou su)
Date: Mon, 12 Sep 2011 21:20:54 -0700 (PDT)
Subject: =?UTF-8?Q?Should_a_beginner_do_some_coding_excises=3F_How_can_I_?=
	=?UTF-8?Q?find_the_sources=EF=BC=9F?=
Message-ID: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>

I'm reading "Learning Python"? Chinese version?. Before I go through
the whole book, I want to do some excises matching each charter.
Any tips? Any better advice?



From amitatgroups at gmail.com  Tue Sep 13 00:26:48 2011
From: amitatgroups at gmail.com (Amit Jain)
Date: Mon, 12 Sep 2011 21:26:48 -0700 (PDT)
Subject: Default Admin user on weblogic domain deleted after executing create
	command using WLST
Message-ID: <a718be0f-824a-47a0-9829-7bb34498f5c8@m4g2000pri.googlegroups.com>

Hello All,

we observed that user exactly deleted when 'create' cmd is executed:
filestore = create("wlstProperties.getProperty(fileStoreName)",
"FileStore")
jmsServer = create("AUAJMSServer", "JMSServer")
...
..
etc.

http://groups.google.com/group/comp.lang.java.programmer/browse_thread/thread/1927322accdb6e6e/223e1c7cd208a86c

Please suggestion...

regards, Amit J.


From jabba.laci at gmail.com  Tue Sep 13 00:33:22 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Tue, 13 Sep 2011 00:33:22 -0400
Subject: update all python packages on Debian/Ubuntu
Message-ID: <CAOuJsMnwWs6z1escn7NB=o+R16s1+BDxPrcA=MQVQ3HnjnvZiQ@mail.gmail.com>

Hi,

I use Ubuntu and the Python packages on my system were either
installed with (1) apt-get, or with (2) pip. Since the number of
python packages in the Ubuntu repositories is limited, I had to
install several packages with pip.

Now I want to upgrade the packages that were installed with pip (and
only those packages).

I can collect the list of python packages:
(pip freeze | cut -d = -f 1 | grep -v FIXME | xargs echo | tr ' ' '\n'
>list.txt) 2>/dev/null

However, if I update every package in list.txt with "pip install -U",
it will also update the ones that were installed with apt-get. Since
apt-get builds a database with the installed files, I'm sure it won't
like that pip replaces those files. I didn't try it yet but I'm afraid
it would mess up the system.

So, how to upgrade the python packages correctly?

Thanks,

Laszlo


From memilanuk at gmail.com  Tue Sep 13 01:14:02 2011
From: memilanuk at gmail.com (memilanuk)
Date: Mon, 12 Sep 2011 22:14:02 -0700
Subject: =?UTF-8?B?UmU6IFNob3VsZCBhIGJlZ2lubmVyIGRvIHNvbWUgY29kaW5nIGV4Y2k=?=
	=?UTF-8?B?c2VzPyBIb3cgY2FuIEkgZmluZCB0aGUgc291cmNlc++8nw==?=
In-Reply-To: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>
References: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>
Message-ID: <j4moqv$saf$1@dough.gmane.org>

On 09/12/2011 09:20 PM, sillyou su wrote:
> I'm reading "Learning Python"? Chinese version?. Before I go through
> the whole book, I want to do some excises matching each charter.
> Any tips? Any better advice?
>


For the code examples, have you tried looking up the home page for the 
book?  Google for 'oreilly learning python' and find the correct edition 
that you have.

If its the 4th ed (current), you should end up on a page like this:

http://shop.oreilly.com/product/9780596158071.do

Down in the right hand side-bar, there should be a menu 'Essential 
Links' and one of the options is 'Download code' or something along 
those lines.  The link should take you to a zip file with all the code 
examples in the book.

As far as practice exercises... maybe something like 
codingbat.com/python would be helpful.  Its not related to the book at 
all, and doesn't go nearly as in depth... but its kind of neat to play 
with and see how your code works when someone else is grading it! (at 
least for me).

HTH,

Monte



From data.2 at rediff.com  Tue Sep 13 01:24:49 2011
From: data.2 at rediff.com (gaurav)
Date: Mon, 12 Sep 2011 22:24:49 -0700 (PDT)
Subject: Get careers in Management work.
Message-ID: <5fd4f6a9-8404-4bda-a484-12bba1aefdc2@z26g2000pre.googlegroups.com>

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From wuwei23 at gmail.com  Tue Sep 13 02:56:30 2011
From: wuwei23 at gmail.com (alex23)
Date: Mon, 12 Sep 2011 23:56:30 -0700 (PDT)
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
Message-ID: <775ad552-1452-4b32-bf93-024c6d3761ea@u6g2000prc.googlegroups.com>

On Sep 10, 1:54 pm, "Littlefield, Tyler" <ty... at tysdomain.com> wrote:
> I'm not feeling particularly masochistic, so I do not want to develop
> this project in PHP; essentially I'm looking to build a web-based MMO.

Google have been promoting the use of appengine along with HTML5 & JS
to produce games. One advantage of using GAE to host the server is it
takes care of the scaling for you.

I found these presentations fascinating:
http://cc-2011-html5-games.appspot.com/#1
http://io-2011-html5-games-hr.appspot.com/#1

This article covers the process in a little more depth:
http://clouddbs.blogspot.com/2011/02/how-to-write-html5-game-in-30-days-with.html

Google are also aggregating platform-specific info here:
http://code.google.com/games

Hope this helps (and let us know when you have something to show off!)


From j.reid at mail.cryst.bbk.ac.uk  Tue Sep 13 03:30:42 2011
From: j.reid at mail.cryst.bbk.ac.uk (John Reid)
Date: Tue, 13 Sep 2011 08:30:42 +0100
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <1ksbq.2549$ex3.1130@newsfe30.ams2>
References: <mailman.1034.1315836239.27778.python-list@python.org>
	<1ksbq.2549$ex3.1130@newsfe30.ams2>
Message-ID: <j4n0r3$cda$1@dough.gmane.org>

On 12/09/11 19:37, Stefaan Himpe wrote:
> The simplest one to learn is web2py http://www.web2py.com
> No configuration needed, just unpack and get started.
> It also has very good documentation and tons of little examples to get
> things done.
>
> The other options you mentioned are good too :)
>

OK I've had a look at bottle, cherrypy and web2py and they look fairly 
straightforward. I'll check out some more and see where I get to. Thanks 
for the tips,
John.



From limodou at gmail.com  Tue Sep 13 03:45:35 2011
From: limodou at gmail.com (limodou)
Date: Tue, 13 Sep 2011 15:45:35 +0800
Subject: Easiest framework to develop simple interactive web site in
	python?
In-Reply-To: <j4n0r3$cda$1@dough.gmane.org>
References: <mailman.1034.1315836239.27778.python-list@python.org>
	<1ksbq.2549$ex3.1130@newsfe30.ams2> <j4n0r3$cda$1@dough.gmane.org>
Message-ID: <CADCtg99xhMhjsoJwjqz19+oEr64O3R6y607O8VAiKBmBFadn5A@mail.gmail.com>

On Tue, Sep 13, 2011 at 3:30 PM, John Reid <j.reid at mail.cryst.bbk.ac.uk> wrote:
> On 12/09/11 19:37, Stefaan Himpe wrote:
>>
>> The simplest one to learn is web2py http://www.web2py.com
>> No configuration needed, just unpack and get started.
>> It also has very good documentation and tons of little examples to get
>> things done.
>>
>> The other options you mentioned are good too :)
>>
>
> OK I've had a look at bottle, cherrypy and web2py and they look fairly
> straightforward. I'll check out some more and see where I get to. Thanks for
> the tips,
> John.
>

maybe you can also try out uliweb.

-- 
I like python!
UliPad <<The Python Editor>>: http://code.google.com/p/ulipad/
UliWeb <<simple web framework>>: http://code.google.com/p/uliweb/
My Blog: http://hi.baidu.com/limodou


From wxjmfauth at gmail.com  Tue Sep 13 03:49:17 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 13 Sep 2011 00:49:17 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
	<op.v1ps4fqia8ncjz@gnudebst>
Message-ID: <44bd982b-e740-4c77-974e-aa8c9eb47d6e@y4g2000vbx.googlegroups.com>

On 12 sep, 23:39, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:


> Now read what Steven wrote again. ?The issue is that the program contains ?
> characters that are syntactically illegal. ?The "engine" can be perfectly ?
> correctly translating a character as a smart quote or a non breaking space ?
> or an e-umlaut or whatever, but that doesn't make the character legal!
>

Yes, you are right. I did not understand in that way.

However, a small correction/precision. Illegal character
do not exit. One can "only" have an ill-formed encoded code
points or an illegal encoded code point representing a
character/glyph.

Basically, in the present case. The issue is most probably
a mismatch between the coding directive and the real
coding, with "no coding directive" == 'ascii'.


jmf


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From: yongyingwen at yahoo.com.cn (fashion t shirts seller)
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Subject: Michael Jordan 23.
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From steve+comp.lang.python at pearwood.info  Tue Sep 13 04:15:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 13 Sep 2011 18:15:39 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
	<op.v1ps4fqia8ncjz@gnudebst>
	<44bd982b-e740-4c77-974e-aa8c9eb47d6e@y4g2000vbx.googlegroups.com>
Message-ID: <4e6f112c$0$29997$c3e8da3$5496439d@news.astraweb.com>

On Tue, 13 Sep 2011 05:49 pm jmfauth wrote:

> On 12 sep, 23:39, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> 
> 
>> Now read what Steven wrote again. ?The issue is that the program contains
>> characters that are syntactically illegal. ?The "engine" can be perfectly
>> correctly translating a character as a smart quote or a non breaking
>> space or an e-umlaut or whatever, but that doesn't make the character
>> legal!
>>
> 
> Yes, you are right. I did not understand in that way.
> 
> However, a small correction/precision. Illegal character
> do not exit. One can "only" have an ill-formed encoded code
> points or an illegal encoded code point representing a
> character/glyph.

You are wrong there. There are many ASCII characters which are illegal in
Python source code, at least outside of comments and string literals, and
possibly even there.

>>> code = "x = 1 + \b 2"  # all ASCII characters
>>> print(code)
x = 1 + 2
>>> exec(code)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1
    x = 1 + 2
            ^
SyntaxError: invalid syntax


Now, imagine that somehow a \b ASCII backspace character somehow gets
introduced into your source file. When you go to run the file, or import
it, you will get a SyntaxError. Changing the encoding will not help.



-- 
Steven



From wxjmfauth at gmail.com  Tue Sep 13 05:04:09 2011
From: wxjmfauth at gmail.com (jmfauth)
Date: Tue, 13 Sep 2011 02:04:09 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<98d81fe1-79df-4e37-87aa-399a78b52353@bi2g2000vbb.googlegroups.com>
	<op.v1ps4fqia8ncjz@gnudebst>
	<44bd982b-e740-4c77-974e-aa8c9eb47d6e@y4g2000vbx.googlegroups.com>
	<4e6f112c$0$29997$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4a674dba-078b-4353-a6ae-01c205460e91@w12g2000yqa.googlegroups.com>

On 13 sep, 10:15, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:

The intrinsic coding of the characters is one thing,
The usage of bytes stream supposed to represent a text
is one another thing,

jmf


From sillyousu at gmail.com  Tue Sep 13 06:31:06 2011
From: sillyousu at gmail.com (sillyou su)
Date: Tue, 13 Sep 2011 03:31:06 -0700 (PDT)
Subject: =?UTF-8?Q?Re=3A_Should_a_beginner_do_some_coding_excises=3F_How_ca?=
	=?UTF-8?Q?n_I_find_the_sources=EF=BC=9F?=
References: <bc8f5933-ceeb-4956-bf17-cd4055ab0a03@f24g2000prb.googlegroups.com>
	<mailman.1059.1315890862.27778.python-list@python.org>
Message-ID: <1ef0994b-e274-420d-8889-e26556cc7b84@h32g2000prl.googlegroups.com>

On Sep 13, 1:14?pm, memilanuk <memila... at gmail.com> wrote:
> On 09/12/2011 09:20 PM, sillyou su wrote:
>
> > I'm reading "Learning Python"? Chinese version?. Before I go through
> > the whole book, I want to do some excises matching each charter.
> > Any tips? Any better advice?
>
> For the code examples, have you tried looking up the home page for the
> book? ?Google for 'oreilly learning python' and find the correct edition
> that you have.
>
> If its the 4th ed (current), you should end up on a page like this:
>
> http://shop.oreilly.com/product/9780596158071.do
>
> Down in the right hand side-bar, there should be a menu 'Essential
> Links' and one of the options is 'Download code' or something along
> those lines. ?The link should take you to a zip file with all the code
> examples in the book.
>
> As far as practice exercises... maybe something like
> codingbat.com/python would be helpful. ?Its not related to the book at
> all, and doesn't go nearly as in depth... but its kind of neat to play
> with and see how your code works when someone else is grading it! (at
> least for me).
>
> HTH,
>
> Monte

codingbat.com/python!
The website is really interesting.
Thank you!


From 1248283536 at qq.com  Tue Sep 13 07:14:15 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Tue, 13 Sep 2011 19:14:15 +0800
Subject: problem:import  csv  data 
Message-ID: <tencent_727B2E693BE1A5F92159BCAB@qq.com>

import sqlite3 
con = sqlite3.connect('/home/stock.db')
cur = con.cursor()
cur.execute('''CREATE TABLE quote (ticker TEXT,date TEXT, popen TEXT, high TEXT, low TEXT,vol TEXT,adjclose TEXT);''')
i=/tmp/data.csv
cur.execute('.separator "," ')
cur.execute('.import  %s  quote'  %  i)
con.commit()
cur.close()
con.close()

the output is :
    cur.execute('.separator"," ')
sqlite3.OperationalError: near ".": syntax error

how to fix it?
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From alexander_naumov at opensuse.org  Tue Sep 13 08:21:03 2011
From: alexander_naumov at opensuse.org (Alex Naumov)
Date: Tue, 13 Sep 2011 14:21:03 +0200
Subject: send string to input of another process
Message-ID: <CABPy6+zG_PBzgQFxq2CCRY556nGg_xPwSVyeCNpRjn+mtKM3Gw@mail.gmail.com>

Hello everybody,

I'm looking for some solution, maybe someone of you can help me.

I call another process via os.system("process") and it waits for some input.
I have to write a comment (for example, like using svn or git), and after
that to close input (for example, like ":wq" using vim).
How can I give/write this comment and put it in the input for next process
(which start after)?


Thanks a lot for your time and help.
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From mimohammedimran41 at gmail.com  Tue Sep 13 08:29:37 2011
From: mimohammedimran41 at gmail.com (mohammed imran)
Date: Tue, 13 Sep 2011 05:29:37 -0700 (PDT)
Subject: mohammedimran
Message-ID: <e0d6d61a-c2dd-423a-8c63-520af4ff61dc@z26g2000pre.googlegroups.com>

http://123maza.com/65/fun564/


From vacorama at gmail.com  Tue Sep 13 08:31:59 2011
From: vacorama at gmail.com (ron)
Date: Tue, 13 Sep 2011 05:31:59 -0700 (PDT)
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>

On Sep 12, 4:49?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> On Mon, 12 Sep 2011 06:43 pm Stefan Behnel wrote:
>
> > I'm not sure what you are trying to say with the above code, but if it's
> > the code that fails for you with the exception you posted, I would guess
> > that the problem is in the "[more stuff here]" part, which likely contains
> > a non-ASCII character. Note that you didn't declare the source file
> > encoding above. Do as Gary told you.
>
> Even with a source code encoding, you will probably have problems with
> source files including \xe2 and other "bad" chars. Unless they happen to
> fall inside a quoted string literal, I would expect to get a SyntaxError.
>
> I have come across this myself. While I haven't really investigated in great
> detail, it appears to happen when copying and pasting code from a document
> (usually HTML) which uses non-breaking spaces instead of \x20 space
> characters. All it takes is just one to screw things up.
>
> --
> Steven

Depending on the load, you can do something like:

"".join([x for x in string if ord(x) < 128])

It's worked great for me in cleaning input on webapps where there's a
lot of copy/paste from varied sources.


From miki.tebeka at gmail.com  Tue Sep 13 09:09:59 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Tue, 13 Sep 2011 06:09:59 -0700 (PDT)
Subject: problem:import  csv  data
In-Reply-To: <mailman.1069.1315912709.27778.python-list@python.org>
References: <mailman.1069.1315912709.27778.python-list@python.org>
Message-ID: <40eaa387-16b1-4100-8998-38e90a9f615e@glegroupsg2000goo.googlegroups.com>

.separator (and .import) are not SQL commands but "sqlite3" commands.
You can get the same effect with the following code:

    with open('/tmp/data.csv') as fo:
        reader = csv.reader(fo)
        cur.executemany('INSERT INTO quote VALUES (?, ?, ?, ?, ?, ?, ?)'), reader)

HTH
--
Miki Tebeka <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From miki.tebeka at gmail.com  Tue Sep 13 09:09:59 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Tue, 13 Sep 2011 06:09:59 -0700 (PDT)
Subject: problem:import  csv  data
In-Reply-To: <mailman.1069.1315912709.27778.python-list@python.org>
References: <mailman.1069.1315912709.27778.python-list@python.org>
Message-ID: <40eaa387-16b1-4100-8998-38e90a9f615e@glegroupsg2000goo.googlegroups.com>

.separator (and .import) are not SQL commands but "sqlite3" commands.
You can get the same effect with the following code:

    with open('/tmp/data.csv') as fo:
        reader = csv.reader(fo)
        cur.executemany('INSERT INTO quote VALUES (?, ?, ?, ?, ?, ?, ?)'), reader)

HTH
--
Miki Tebeka <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From manodec25 at gmail.com  Tue Sep 13 09:22:16 2011
From: manodec25 at gmail.com (mano mano)
Date: Tue, 13 Sep 2011 06:22:16 -0700 (PDT)
Subject: The Usenet newsgroup news:comp.lang.python ...
Message-ID: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>

Mikael Lyngvig accurately summarizes comp.lang.python discussion of
the technical merits of Tkinter, wxPython, and Python-bound JPI.
Malcolm Tredinnick ...............

http://123maza.com/48/doll789/


From pavlovevidence at gmail.com  Tue Sep 13 09:31:52 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 13 Sep 2011 06:31:52 -0700 (PDT)
Subject: PC locks up with list operations
In-Reply-To: <mailman.600.1314795040.27778.python-list@python.org>
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<4E5E2BCB.5090903@simplistix.co.uk>
	<mailman.600.1314795040.27778.python-list@python.org>
Message-ID: <7ae217be-3069-404a-8fcc-e45f4187f30c@glegroupsg2000goo.googlegroups.com>

On Wednesday, August 31, 2011 5:49:24 AM UTC-7, Benjamin Kaplan wrote:
> 32-bit or 64-bit Python? A 32-bit program will crash once memory hits
> 2GB. A 64-bit program will just keep consuming RAM until your computer
> starts thrashing. The problem isn't your program using more RAM than
> you have, just more RAM than you have free. Last time I faced a
> situation like this, I just decided it was better to stick to the
> 32-bit program and let it crash if it got too big.

On my 64-bit Linux system, I got a memory error in under a second, no thrashing.

I have no swap.  It's overrated.


Carl Banks


From vlastimil.brom at gmail.com  Tue Sep 13 09:33:00 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 13 Sep 2011 15:33:00 +0200
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
Message-ID: <CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>

2011/9/13 ron <vacorama at gmail.com>:
>
> Depending on the load, you can do something like:
>
> "".join([x for x in string if ord(x) < 128])
>
> It's worked great for me in cleaning input on webapps where there's a
> lot of copy/paste from varied sources.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Well, for this kind of dirty "data cleaning" you may as well use e.g.

>>> u"?te?xt ??? wi????th??? ??no????n AS???C?????I?????I?? i???n ??bet????wee???n .??..?".encode("ascii", "ignore").decode("ascii")
u'text  with non ASCII in between ...'
>>>

vbr


From jon at jaggersoft.com  Tue Sep 13 09:34:56 2011
From: jon at jaggersoft.com (Jon Jagger)
Date: Tue, 13 Sep 2011 06:34:56 -0700 (PDT)
Subject: ACCU conference call for proposals
Message-ID: <e86dcb76-29a4-4c7e-b803-c77356bab643@n35g2000yqf.googlegroups.com>


ACCU is a non-profit organisation run by software enthusiasts for
software enthusiasts.

ACCU warmly invites you to propose a session for this leading software
development conference.

Call for Proposals - ACCU 2012
April 24-28, 2012. Barcelo Oxford Hotel, Oxford, UK
Submission website: https://www.conftool.pro/accu2012/
Submission deadline: 16th of October 2011
twitter: @accu2012 #accu2012

More details can be found here
http://accu.org/index.php/conferences/accu_conference_2012/accu2012_Call_for_Papers

The conference has always benefited from the strength of its
programme. Please help us make 2012 another successful event.

Jon Jagger
Conference Chair


From kushal.kumaran+python at gmail.com  Tue Sep 13 10:01:41 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Tue, 13 Sep 2011 19:31:41 +0530
Subject: send string to input of another process
In-Reply-To: <CABPy6+zG_PBzgQFxq2CCRY556nGg_xPwSVyeCNpRjn+mtKM3Gw@mail.gmail.com>
References: <CABPy6+zG_PBzgQFxq2CCRY556nGg_xPwSVyeCNpRjn+mtKM3Gw@mail.gmail.com>
Message-ID: <CAH8GtdMooPje6p3rdr0B2PRYsoumJa7VV=j2DW1-h9ymnrh8jg@mail.gmail.com>

On 13 Sep 2011 17:53, "Alex Naumov" <alexander_naumov at opensuse.org> wrote:
>
> Hello everybody,
>
> I'm looking for some solution, maybe someone of you can help me.
>
> I call another process via os.system("process") and it waits for some
input. I have to write a comment (for example, like using svn or git), and
after that to close input (for example, like ":wq" using vim).
> How can I give/write this comment and put it in the input for next process
(which start after)?
>
>

Take a look at the subprocess module, especially the communicate method.
Note that you will not be able to script screen-oriented programs like vim
using this, unless it has some mode where you can drive it by piping
commands on stdin.

If you want to provide commit messages, I'm sure your vc system accepts
those on the command line instead.

-- 
regards,
kushal
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From saranyamathaiyan at gmail.com  Tue Sep 13 10:52:13 2011
From: saranyamathaiyan at gmail.com (saranya saran)
Date: Tue, 13 Sep 2011 07:52:13 -0700 (PDT)
Subject: HI YOU WILL GET EARN MORE MONEY
Message-ID: <c685858e-dc2e-4827-bbea-b4c0c4b1be55@e34g2000pri.googlegroups.com>

open this webpage you will get more ideas


Webpages: http://123maza.com/65/tiger205/


From alec.taylor6 at gmail.com  Tue Sep 13 11:02:05 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 14 Sep 2011 01:02:05 +1000
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
	<CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
Message-ID: <CAO+9iGfMToWvMOyha__DnAH=S-uaDS6wZEk+uFrH15seuO7ynQ@mail.gmail.com>

Hmm, nothing mentioned so far works for me...

Here's a very small test case:

>>> python -u "Convert to Creole.py"
  File "Convert to Creole.py", line 1
SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
on line 1, but no encoding declared; see
http://www.python.org/peps/pep-0263.html for details
>>> Exit Code: 1

Line 1: a=u'''?'''.encode("ascii", "ignore").decode("ascii")

On Tue, Sep 13, 2011 at 11:33 PM, Vlastimil Brom
<vlastimil.brom at gmail.com> wrote:
> 2011/9/13 ron <vacorama at gmail.com>:
>>
>> Depending on the load, you can do something like:
>>
>> "".join([x for x in string if ord(x) < 128])
>>
>> It's worked great for me in cleaning input on webapps where there's a
>> lot of copy/paste from varied sources.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> Well, for this kind of dirty "data cleaning" you may as well use e.g.
>
>>>> u"?te?xt ??? wi????th??? ??no????n AS???C?????I?????I?? i???n ??bet????wee???n .??..?".encode("ascii", "ignore").decode("ascii")
> u'text ?with non ASCII in between ...'
>>>>
>
> vbr
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From jpiitula at ling.helsinki.fi  Tue Sep 13 11:29:03 2011
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 13 Sep 2011 18:29:03 +0300
Subject: How do I automate the removal of all non-ascii characters from my
	code?
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
	<CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
	<mailman.1074.1315926128.27778.python-list@python.org>
Message-ID: <qotty8gwjeo.fsf@ruuvi.it.helsinki.fi>

Alec Taylor writes:

> Hmm, nothing mentioned so far works for me...
> 
> Here's a very small test case:
> 
> >>> python -u "Convert to Creole.py"
>   File "Convert to Creole.py", line 1
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 1, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details
> >>> Exit Code: 1
> 
> Line 1: a=u'''?'''.encode("ascii", "ignore").decode("ascii")

The people who told you to declare the source code encoding in the
source file would like to see Line 0.

See <http://www.python.org/peps/pep-0263.html>.

[1001] ruuvi$ cat ctc.py
# coding=utf-8
print u'''x ? 1'''.encode("ascii", "ignore").decode("ascii")
[1002] ruuvi$ python ctc.py
x  1
[1003] ruuvi$ 


From ian.g.kelly at gmail.com  Tue Sep 13 11:45:03 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Tue, 13 Sep 2011 09:45:03 -0600
Subject: PyWart: Itertools module needs attention
In-Reply-To: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
Message-ID: <CALwzid=s8zNLL+L9zDRGSSwicL7pvppcC858wV+VpPpHbc_csQ@mail.gmail.com>

On Mon, Sep 12, 2011 at 4:04 PM, rantingrick <rantingrick at gmail.com> wrote:
>
> ############################################################
> # ? ? ? ? ? ? ? ? ? ? ? ? ?Quote ? ? ? ? ? ? ? ? ? ? ? ? ? #
> ############################################################
> # The itertools module is great HOWEVER i believe most ? ? #
> # people are recreating the functionalities due to the ? ? #
> # insanely cryptic and/or missing examples from each ? ? ? #
> # method ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? #
> ############################################################

Have you looked at the online itertools documentation at all?

http://docs.python.org/library/itertools.html

> py> ''.join(list(itertools.dropwhile(lambda x:x==" ", " ? ?hello
> word ? ?")))
> 'hello word ? ?'
> py> ''.join(list(itertools.takewhile(lambda x:x==" ", " ? ?hello
> word ? ?")))
> ' ? ?'

These are too complex to be good examples.  Drop the lambda and
replace it with a built-in.  Also, str.join is perfectly capable of
taking an iterator as its argument.  There is no reason at all to
construct a list first.

> py> print itertools.compress.__doc__
> compress(data, selectors) --> iterator over selected data
> Return data elements corresponding to true selector elements.
> Forms a shorter iterator from selected data elements using the
> selectors to choose the data elements.
>
> ############################################################
> # ? ? ? ? ? ? ? ? ? ? ? ? ?Quote ? ? ? ? ? ? ? ? ? ? ? ? ? #
> ############################################################
> # WTF! Would you like to define a Python "selector". Could #
> # it be that we should be using "selector function" or ? ? #
> # "predicate function" instead? ? ? ? ? ? ? ? ? ? ? ? ? ? ?#
> ############################################################

Notice that it says "selector elements", not "selector functions".
You have misconstrued what this function does.  Hint: it does not use
predicates at all.

I can agree though that this could probably use a simple example in
the doc string.


From ramit.prasad at jpmorgan.com  Tue Sep 13 12:24:10 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 12:24:10 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>

Written by Kayode Odeyemi
Well, I did try using super(), but I got this:
>>> class B(A):
...     def __init__(self, module):
...             super(A, self).log('system')
...
>>> c = B('module')
=================================================
You should be passed super the current class you want the super class of, not the type of the super class. So it should be:
super(B, self).log('system') # Notice that it passed class B


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423





This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
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From davea at ieee.org  Tue Sep 13 12:37:11 2011
From: davea at ieee.org (Dave Angel)
Date: Tue, 13 Sep 2011 12:37:11 -0400
Subject: The Usenet newsgroup news:comp.lang.python ...
In-Reply-To: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
Message-ID: <4E6F86B7.8080601@ieee.org>

On 01/-10/-28163 02:59 PM, mano mano wrote:
> Mikael Lyngvig accurately summarizes comp.lang.python discussion of
> the technical merits of Tkinter, wxPython, and Python-bound JPI.
> Malcolm Tredinnick ...............
>
> http://12......89/
>
SPAM ALERT



From ramit.prasad at jpmorgan.com  Tue Sep 13 12:46:08 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 12:46:08 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>

>You should be passed super the current class you want the super class of, not the type of the super class. So it should be:
>super(B, self).log('system') # Notice that it passed class B

Ugh, apologies for the poor English; my tea has not kicked in.

That first line would be more understandable as:  'You should pass the current class (B) you want the super class of, not the type of the super class (A) itself. So it should be:'

To clarify, by passing A to super it retrieves the definition for the base class (object) which does not have the function you are trying to access.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
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From dreyemi at gmail.com  Tue Sep 13 12:56:55 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 13 Sep 2011 17:56:55 +0100
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>

On Tue, Sep 13, 2011 at 5:46 PM, Prasad, Ramit <ramit.prasad at jpmorgan.com>wrote:

> >You should be passed super the current class you want the super class of,
> not the type of the super class. So it should be:****
>
> >super(*B*, self).log('system') # Notice that it passed class B****
>
> ** **
>
> Ugh, apologies for the poor English; my tea has not kicked in.****
>
> ** **
>
> That first line would be more understandable as:  ?You should pass the
> current class (B) you want the super class of, not the type of the super
> class (A) itself. So it should be:?****
>
> ** **
>
> To clarify, by passing A to super it retrieves the definition for the base
> class (object) which does not have the function you are trying to access.*
> ***
>
> ** **
>
> Ramit
>

Thanks for helping me clarify on how to use super() in Py2+. That really
worked!

>>> class B(A):
...     def __init__(self, module):
...             self.module = A.log(self, module)
...             print self.module # printing here is completely unnecessary
in a good OOP language
...
>>> c = B('system')
logged
>>> class B(A):
...     def __init__(self, module):
...             print super(B, self).log('system') # printing here is
completely unnecessary in a good OOP language
...
>>> c = B('system')
logged
>>>

When an instance of a class is created, all codes within that instance block
should be executed. That's my understanding of OOP.

Thanks everyone!


> ****
>
> ** **
>
> ** **
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology****
>
> 712 Main Street | Houston, TX 77002****
>
> work phone: 713 - 216 - 5423****
>
> ****
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of securities,
> accuracy and completeness of information, viruses, confidentiality, legal
> privilege, and legal entity disclaimers, available at
> http://www.jpmorgan.com/pages/disclosures/email.
>



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From ian.g.kelly at gmail.com  Tue Sep 13 13:24:34 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Tue, 13 Sep 2011 11:24:34 -0600
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
	<CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
Message-ID: <CALwzidkyA-B8_Z4=CpK0miyusn+jTiEKjCvrg0AtoZK-trHZKQ@mail.gmail.com>

On Tue, Sep 13, 2011 at 10:56 AM, Kayode Odeyemi <dreyemi at gmail.com> wrote:
>>>> class B(A):
> ... ? ? def __init__(self, module):
> ... ? ? ? ? ? ? self.module = A.log(self, module)
> ... ? ? ? ? ? ? print self.module # printing here is completely unnecessary
> in a good OOP language
> ...
>>>> c = B('system')
> logged
>>>> class B(A):
> ... ? ? def __init__(self, module):
> ... ? ? ? ? ? ? print super(B, self).log('system')?# printing here is
> completely unnecessary in a good OOP language
> ...
>>>> c = B('system')
> logged
>>>>
> When an instance of a class is created, all codes within that instance block
> should be executed. That's my understanding of OOP.

The initializer should be executed, which is what Python does.  Your
initializer then calls A.log, which does nothing interesting at all.

My question is, what exactly is it that you intend A.log to do?  As
written, it does not do any logging.  It merely constructs a string
and then returns it.  Neither constructing a string, nor returning a
string, imply logging it or printing it.


From vlastimil.brom at gmail.com  Tue Sep 13 14:13:44 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 13 Sep 2011 20:13:44 +0200
Subject: How do I automate the removal of all non-ascii characters from my
	code?
In-Reply-To: <CAO+9iGfMToWvMOyha__DnAH=S-uaDS6wZEk+uFrH15seuO7ynQ@mail.gmail.com>
References: <CAO+9iGc0f7vFLrjjm24vzZqoMV04eL4fBQrYOTfDt-eYCNEacQ@mail.gmail.com>
	<4E6DC028.1020101@islandtraining.com>
	<CAO+9iGfHABoWnz-Podk9J5D3EJFgQ-9th=ky2Z-uW8MbQJA12A@mail.gmail.com>
	<CAO+9iGe2JcUHY8u+KEZfv3r8VmBdJ9h9NLwL3nO2Wpm80zRT2Q@mail.gmail.com>
	<mailman.1021.1315817058.27778.python-list@python.org>
	<4e6dc7b4$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<ee50be9b-2710-423b-9c69-744cc173ac85@dq7g2000vbb.googlegroups.com>
	<CAHzaPEM7OURL_UESEEJGBVHOaTT0TS6LgVf+SV2UuGQg8czS6w@mail.gmail.com>
	<CAO+9iGfMToWvMOyha__DnAH=S-uaDS6wZEk+uFrH15seuO7ynQ@mail.gmail.com>
Message-ID: <CAHzaPENCfsL-Kk5UCQDqRjOuOTRoZRGtuAP6nPKAcE8ONchokQ@mail.gmail.com>

2011/9/13 Alec Taylor <alec.taylor6 at gmail.com>:
> Hmm, nothing mentioned so far works for me...
>
> Here's a very small test case:
>
>>>> python -u "Convert to Creole.py"
> ?File "Convert to Creole.py", line 1
> SyntaxError: Non-ASCII character '\xe2' in file Convert to Creole.py
> on line 1, but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details
>>>> Exit Code: 1
>
> Line 1: a=u'''?'''.encode("ascii", "ignore").decode("ascii")
>
> On Tue, Sep 13, 2011 at 11:33 PM, Vlastimil Brom
> <vlastimil.brom at gmail.com> wrote:
>> 2011/9/13 ron <vacorama at gmail.com>:
>>>
>>> Depending on the load, you can do something like:
>>>
>>> "".join([x for x in string if ord(x) < 128])
>>>
>>> It's worked great for me in cleaning input on webapps where there's a
>>> lot of copy/paste from varied sources.
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>> Well, for this kind of dirty "data cleaning" you may as well use e.g.
>>
>>>>> u"?te?xt ??? wi????th??? ??no????n AS???C?????I?????I?? i???n ??bet????wee???n .??..?".encode("ascii", "ignore").decode("ascii")
>> u'text ?with non ASCII in between ...'
>>>>>
>>
>> vbr
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>

Ok, in that case the encoding probably would be utf-8; \xe2 is just
the first part of the encoded data

>>> u'?'.encode("utf-8")
'\xe2\x89\xa4'
>>>

Setting this encoding at the beginning of the file, as mentioned
before, might solve the problem while retaining the symbol in question
(or you could move from syntax error to some unicode related error
depending on other circumstances...).

vbr


From davea at ieee.org  Tue Sep 13 15:31:08 2011
From: davea at ieee.org (Dave Angel)
Date: Tue, 13 Sep 2011 15:31:08 -0400
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>	<4E6C9044.5060302@jollybox.de>	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
	<CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
Message-ID: <4E6FAF7C.40406@ieee.org>

On 01/-10/-28163 02:59 PM, Kayode Odeyemi wrote:
>
> When an instance of a class is created, all codes within that instance block
> should be executed. That's my understanding of OOP.
>
I don't understand this phrasing at all.   Could you show a specific 
example of something that does not execute code you think should be 
executed?  I suspect you're just confused by things the interactive 
session is printing out, which are not part of the language, and work a 
bit differently.

DaveA



From dreyemi at gmail.com  Tue Sep 13 15:53:18 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 13 Sep 2011 20:53:18 +0100
Subject: Invoke a superclass method from a subclass constructor
In-Reply-To: <4E6FAF7C.40406@ieee.org>
References: <CAPbrmCtnuAGk=T=hS43GH5g_Tx2oAGbQJ+AODrVfc5jxyQk7RA@mail.gmail.com>
	<4E6C9044.5060302@jollybox.de>
	<CAPbrmCua4wZFJEyiTJHe5Wo_+ho_Q=F-GRsYvSs_FqEdNTP_Xw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B197E2@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16B1987A@EMARC112VS01.exchad.jpmchase.net>
	<CAPbrmCtEemgxBC1RRjFSmuePsp8AkO8FTO95orJ_T3MMB=j3Og@mail.gmail.com>
	<4E6FAF7C.40406@ieee.org>
Message-ID: <CAPbrmCuaHmVhRLncjGFk8v0vWQa9bW8K9DdvTRQsEPKze-vZrw@mail.gmail.com>

On Tue, Sep 13, 2011 at 8:31 PM, Dave Angel <davea at ieee.org> wrote:

> I suspect you're just confused by things the interactive session is
> printing out, which are not part of the language, and work a bit
> differently.


You are right. This is where I missed it. The command interface requires a
print command, as against using a return statement.

My apologies.



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From arnodel at gmail.com  Tue Sep 13 16:20:16 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 13 Sep 2011 21:20:16 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
Message-ID: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>

Hi all,

Unpyc3 can recreate Python3 source code from code objects, function
source code from function objects, and module source code from .pyc
files. The current version is able to decompile itself successfully
:). It has been tested with Python3.2 only.

It currently reconstructs most of Python 3 (see TODO below) constructs
but probably needs to be tested more thoroughly. All feedback welcome.

Unpyc3 is a single file and is available at http://code.google.com/p/unpyc3/

Example:

>>> from unpyc3 import decompile
>>> def foo(x, y, z=3, *args):
...    global g
...    for i, j in zip(x, y):
...        if z == i + j or args[i] == j:
...            g = i, j
...            return
...
>>> print(decompile(foo))
def foo(x, y, z=3, *args):
    global g
    for i, j in zip(x, y):
        if z == i + j or args[i] == j:
            g = i, j
            return

TODO:

* Support for keyword-only arguments
* Handle assert statements
* Show docstrings for functions and modules
* Nice spacing between function/class declarations

Have fun!

Note: unpyc3 is totally unrelated to another project called "unpyc"
which I discovered when I tried to register the same project name on
google code.

-- 
Arnaud


From tjhanson at yahoo.com  Tue Sep 13 16:25:06 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 13:25:06 -0700
Subject: Need some experience
Message-ID: <201109131325.06524.tjhanson@yahoo.com>

I have been a desktop Linux user for better than eleven years, as a hobby.  
Back when we still did most of our computing on desktops I even set up a 
rudimentary server setup in my home.  Nothing fancy or anything, but I was 
proud of it and of the fact that it was built Microsoft free.  I have no 
formal education in IT nor programming.  Retired now, my career was finance; I 
was an IRS field agent.

Since retiring two years ago, I have renewed my interest in software.  I know 
some C and lately decided to learn Python.  I have worked through a couple of 
the introductory texts and have a feeling for the OOP model, although I won't 
be able to  call myself an experienced practitioner anytime soon.

I am looking for an open source project that will allow me to develop my 
skills further.

Financially, I'm set; I'm not looking for a job.  I'm looking for some drudge 
work, where I can look at other peoples' code and make a contribution.  
Naturally I do not want to do this forever; I'm hoping to get up to speed with 
my skill set so I can work to more complexity later.

Does anyone have some ideas that would help me?


From t at jollybox.de  Tue Sep 13 16:37:05 2011
From: t at jollybox.de (Thomas Jollans)
Date: Tue, 13 Sep 2011 22:37:05 +0200
Subject: Need some experience
In-Reply-To: <201109131325.06524.tjhanson@yahoo.com>
References: <201109131325.06524.tjhanson@yahoo.com>
Message-ID: <4E6FBEF1.5020404@jollybox.de>

On 13/09/11 22:25, Tim Hanson wrote:
> I have been a desktop Linux user for better than eleven years, as a hobby.  
> Back when we still did most of our computing on desktops I even set up a 
> rudimentary server setup in my home.  Nothing fancy or anything, but I was 
> proud of it and of the fact that it was built Microsoft free.  I have no 
> formal education in IT nor programming.  Retired now, my career was finance; I 
> was an IRS field agent.
> 
> Since retiring two years ago, I have renewed my interest in software.  I know 
> some C and lately decided to learn Python.  I have worked through a couple of 
> the introductory texts and have a feeling for the OOP model, although I won't 
> be able to  call myself an experienced practitioner anytime soon.
> 
> I am looking for an open source project that will allow me to develop my 
> skills further.
> 
> Financially, I'm set; I'm not looking for a job.  I'm looking for some drudge 
> work, where I can look at other peoples' code and make a contribution.  
> Naturally I do not want to do this forever; I'm hoping to get up to speed with 
> my skill set so I can work to more complexity later.
> 
> Does anyone have some ideas that would help me?

This is becoming something of an FAQ - I don't suppose there's a canned
response link somewhere ? ;-)

I like to recommend CPython itself ? which is a bit hypocritical, as I
haven't touched it in quite a while. It has a constantly overflowing bug
tracker where I'm sure you can find a lot of fascinating problems that
need solving. The community, I have found, is welcoming and friendly.
Much of the standard library is written in Python, but if you know C,
you can have a go at the C code as well.

Thomas


From tjhanson at yahoo.com  Tue Sep 13 16:52:24 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 13:52:24 -0700
Subject: Need some experience
In-Reply-To: <4E6FBEF1.5020404@jollybox.de>
References: <201109131325.06524.tjhanson@yahoo.com>
	<4E6FBEF1.5020404@jollybox.de>
Message-ID: <201109131352.25059.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 01:37:05 pm Thomas Jollans wrote:
> On 13/09/11 22:25, Tim Hanson wrote:
> > I have been a desktop Linux user for better than eleven years, as a
> > hobby. Back when we still did most of our computing on desktops I even
> > set up a rudimentary server setup in my home.  Nothing fancy or
> > anything, but I was proud of it and of the fact that it was built
> > Microsoft free.  I have no formal education in IT nor programming. 
> > Retired now, my career was finance; I was an IRS field agent.
> > 
> > Since retiring two years ago, I have renewed my interest in software.  I
> > know some C and lately decided to learn Python.  I have worked through a
> > couple of the introductory texts and have a feeling for the OOP model,
> > although I won't be able to  call myself an experienced practitioner
> > anytime soon.
> > 
> > I am looking for an open source project that will allow me to develop my
> > skills further.
> > 
> > Financially, I'm set; I'm not looking for a job.  I'm looking for some
> > drudge work, where I can look at other peoples' code and make a
> > contribution. Naturally I do not want to do this forever; I'm hoping to
> > get up to speed with my skill set so I can work to more complexity
> > later.
> > 
> > Does anyone have some ideas that would help me?
> 
> This is becoming something of an FAQ - I don't suppose there's a canned
> response link somewhere ? ;-)
> 
> I like to recommend CPython itself ? which is a bit hypocritical, as I
> haven't touched it in quite a while. It has a constantly overflowing bug
> tracker where I'm sure you can find a lot of fascinating problems that
> need solving. The community, I have found, is welcoming and friendly.
> Much of the standard library is written in Python, but if you know C,
> you can have a go at the C code as well.
> 
> Thomas

That's not a bad idea.  From the past I know that bug fixing is a great way to 
learn a language.  If you know a specific site to key in on, feel free to send 
me there.  Otherwise I'll poke around the Python site and find it.


From tjhanson at yahoo.com  Tue Sep 13 17:14:45 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 14:14:45 -0700
Subject: Need some experience
In-Reply-To: <4E6FBEF1.5020404@jollybox.de>
References: <201109131325.06524.tjhanson@yahoo.com>
	<4E6FBEF1.5020404@jollybox.de>
Message-ID: <201109131414.45610.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 01:37:05 pm Thomas Jollans wrote:
> On 13/09/11 22:25, Tim Hanson wrote:
> > I have been a desktop Linux user for better than eleven years, as a
> > hobby. Back when we still did most of our computing on desktops I even
> > set up a rudimentary server setup in my home.  Nothing fancy or
> > anything, but I was proud of it and of the fact that it was built
> > Microsoft free.  I have no formal education in IT nor programming. 
> > Retired now, my career was finance; I was an IRS field agent.
> > 
> > Since retiring two years ago, I have renewed my interest in software.  I
> > know some C and lately decided to learn Python.  I have worked through a
> > couple of the introductory texts and have a feeling for the OOP model,
> > although I won't be able to  call myself an experienced practitioner
> > anytime soon.
> > 
> > I am looking for an open source project that will allow me to develop my
> > skills further.
> > 
> > Financially, I'm set; I'm not looking for a job.  I'm looking for some
> > drudge work, where I can look at other peoples' code and make a
> > contribution. Naturally I do not want to do this forever; I'm hoping to
> > get up to speed with my skill set so I can work to more complexity
> > later.
> > 
> > Does anyone have some ideas that would help me?
> 
> This is becoming something of an FAQ - I don't suppose there's a canned
> response link somewhere ? ;-)
> 
> I like to recommend CPython itself ? which is a bit hypocritical, as I
> haven't touched it in quite a while. It has a constantly overflowing bug
> tracker where I'm sure you can find a lot of fascinating problems that
> need solving. The community, I have found, is welcoming and friendly.
> Much of the standard library is written in Python, but if you know C,
> you can have a go at the C code as well.
> 
> Thomas
Never mind.  I found it.


From lists at cheimes.de  Tue Sep 13 17:36:52 2011
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 13 Sep 2011 23:36:52 +0200
Subject: Need some experience
In-Reply-To: <201109131352.25059.tjhanson@yahoo.com>
References: <201109131325.06524.tjhanson@yahoo.com>	<4E6FBEF1.5020404@jollybox.de>
	<201109131352.25059.tjhanson@yahoo.com>
Message-ID: <j4oidk$2ia$1@dough.gmane.org>

Am 13.09.2011 22:52, schrieb Tim Hanson:
> That's not a bad idea.  From the past I know that bug fixing is a great way to 
> learn a language.  If you know a specific site to key in on, feel free to send 
> me there.  Otherwise I'll poke around the Python site and find it.

It's a great idea. We are always looking for volunteers that help the
community to reduce the amount of open bugs. The bug tracker at
http://bugs.python.org/ even has a category for beginners. You just have
to search for keyword -> easy and you'll get a bunch of low hanging
fruits to pick from.



From tjhanson at yahoo.com  Tue Sep 13 18:09:42 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 15:09:42 -0700
Subject: Need some experience
In-Reply-To: <j4oidk$2ia$1@dough.gmane.org>
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131352.25059.tjhanson@yahoo.com>
	<j4oidk$2ia$1@dough.gmane.org>
Message-ID: <201109131509.42974.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 02:36:52 pm Christian Heimes wrote:
> Am 13.09.2011 22:52, schrieb Tim Hanson:
> > That's not a bad idea.  From the past I know that bug fixing is a great
> > way to learn a language.  If you know a specific site to key in on, feel
> > free to send me there.  Otherwise I'll poke around the Python site and
> > find it.
> 
> It's a great idea. We are always looking for volunteers that help the
> community to reduce the amount of open bugs. The bug tracker at
> http://bugs.python.org/ even has a category for beginners. You just have
> to search for keyword -> easy and you'll get a bunch of low hanging
> fruits to pick from.

This is exactly what I'm looking for. I don't know who is the "volunteer"  
here, me for obvious reasons, or the Python community for doing some free 
hand-holding.  Now I know how I'll spend the next year.  Thank you!


From jack.bates at gmail.com  Tue Sep 13 18:27:32 2011
From: jack.bates at gmail.com (Jack Bates)
Date: Tue, 13 Sep 2011 15:27:32 -0700
Subject: ImportError: cannot import name dns
Message-ID: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>

Why is the following ImportError raised?

$ ./test
Traceback (most recent call last):
  File "./test", line 3, in <module>
    from foo import dns
  File "/home/jablko/foo/dns.py", line 1, in <module>
    from foo import udp
  File "/home/jablko/foo/udp.py", line 1, in <module>
    from foo import dns
ImportError: cannot import name dns
$

I reproduce this error with the following four files and five lines:

== foo/dns.py ==
from foo import udp

== foo/udp.py ==
from foo import dns

== foo/__init__.py ==
(empty)

== test ==
#!/usr/bin/env python

from foo import dns


From ben+python at benfinney.id.au  Tue Sep 13 18:37:02 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 14 Sep 2011 08:37:02 +1000
Subject: Need some experience
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131352.25059.tjhanson@yahoo.com> <j4oidk$2ia$1@dough.gmane.org>
	<mailman.1090.1315951797.27778.python-list@python.org>
Message-ID: <87y5xsjchd.fsf@benfinney.id.au>

Tim Hanson <tjhanson at yahoo.com> writes:

> On Tuesday, September 13, 2011 02:36:52 pm Christian Heimes wrote:
> > We are always looking for volunteers that help the community to
> > reduce the amount of open bugs. The bug tracker at
> > http://bugs.python.org/ even has a category for beginners. You just
> > have to search for keyword -> easy and you'll get a bunch of low
> > hanging fruits to pick from.
>
> This is exactly what I'm looking for. I don't know who is the "volunteer"  
> here, me for obvious reasons, or the Python community for doing some free 
> hand-holding.  Now I know how I'll spend the next year.  Thank you!

Excellent attitude. Thank you in advance for contributing to the Python
community.

-- 
 \        ?With Lisp or Forth, a master programmer has unlimited power |
  `\     and expressiveness. With Python, even a regular guy can reach |
_o__)                               for the stars.? ?Raymond Hettinger |
Ben Finney


From ben+python at benfinney.id.au  Tue Sep 13 18:40:35 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 14 Sep 2011 08:40:35 +1000
Subject: The Usenet newsgroup news:comp.lang.python ...
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
Message-ID: <87ty8gjcbg.fsf@benfinney.id.au>

mano mano <manodec25 at gmail.com> writes:

> Mikael Lyngvig accurately summarizes comp.lang.python discussion

No, you're posting spam links. Go away and spend the rest of your
miserable life in a deep hole.

-- 
 \      ?If society were bound to invent technologies which could only |
  `\   be used entirely within the law, then we would still be sitting |
_o__)       in caves sucking our feet.? ?Gene Kan, creator of Gnutella |
Ben Finney


From ramit.prasad at jpmorgan.com  Tue Sep 13 18:53:49 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 18:53:49 -0400
Subject: The Usenet newsgroup news:comp.lang.python ...
In-Reply-To: <87ty8gjcbg.fsf@benfinney.id.au>
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
	<87ty8gjcbg.fsf@benfinney.id.au>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB46E8@EMARC112VS01.exchad.jpmchase.net>

>> Mikael Lyngvig accurately summarizes comp.lang.python discussion

>No, you're posting spam links. Go away and spend the rest of your
>miserable life in a deep hole.

I was wondering since the text seemed like plausible non-spam (to me). 

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From rosuav at gmail.com  Tue Sep 13 18:58:13 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 14 Sep 2011 08:58:13 +1000
Subject: The Usenet newsgroup news:comp.lang.python ...
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB46E8@EMARC112VS01.exchad.jpmchase.net>
References: <89dd8a94-98ec-4809-884f-688038861edc@a10g2000prn.googlegroups.com>
	<87ty8gjcbg.fsf@benfinney.id.au>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB46E8@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPTjJmpW9santrR4rYe8CrahbBF4B4WArsMw5QRp-xqemALe9w@mail.gmail.com>

On Wed, Sep 14, 2011 at 8:53 AM, Prasad, Ramit
<ramit.prasad at jpmorgan.com> wrote:
> I was wondering since the text seemed like plausible non-spam (to me).
>

I suspect it was autogenerated from subject lines of recent emails.
It'd not be hard to design a template that covers comp.lang.* or even
comp.*.

ChrisA


From ramit.prasad at jpmorgan.com  Tue Sep 13 19:09:50 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Tue, 13 Sep 2011 19:09:50 -0400
Subject: ImportError: cannot import name dns
In-Reply-To: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
References: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>

-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Jack Bates
Sent: Tuesday, September 13, 2011 5:28 PM
To: python-list at python.org
Subject: ImportError: cannot import name dns

Why is the following ImportError raised?

$ ./test
Traceback (most recent call last):
  File "./test", line 3, in <module>
    from foo import dns
  File "/home/jablko/foo/dns.py", line 1, in <module>
    from foo import udp
  File "/home/jablko/foo/udp.py", line 1, in <module>
    from foo import dns
ImportError: cannot import name dns
$

I reproduce this error with the following four files and five lines:

== foo/dns.py ==
from foo import udp

== foo/udp.py ==
from foo import dns

== foo/__init__.py ==
(empty)

== test ==
#!/usr/bin/env python

from foo import dns


===========================================================================
 
It is a circular dependency. Dns will try to import udp which will in turn import dns (again) in an endless cycle; instead an ImportError is raised. 

Circular dependency is a Bad Thing.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From tjreedy at udel.edu  Tue Sep 13 21:12:27 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 13 Sep 2011 21:12:27 -0400
Subject: Need some experience
In-Reply-To: <201109131509.42974.tjhanson@yahoo.com>
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131352.25059.tjhanson@yahoo.com>
	<j4oidk$2ia$1@dough.gmane.org>
	<201109131509.42974.tjhanson@yahoo.com>
Message-ID: <j4ov1t$bmg$1@dough.gmane.org>


>> It's a great idea. We are always looking for volunteers that help the
>> community to reduce the amount of open bugs. The bug tracker at
>> http://bugs.python.org/ even has a category for beginners. You just have
>> to search for keyword ->  easy and you'll get a bunch of low hanging
>> fruits to pick from.
>
> This is exactly what I'm looking for. I don't know who is the "volunteer"
> here, me for obvious reasons, or the Python community for doing some free
> hand-holding.  Now I know how I'll spend the next year.  Thank you!

Also consider the core-mentorship mailing list and the dev guide at
http://docs.python.org/devguide
-- 
Terry Jan Reedy



From elven199208 at gmail.com  Tue Sep 13 21:19:37 2011
From: elven199208 at gmail.com (zhenzhen zhang)
Date: Tue, 13 Sep 2011 18:19:37 -0700 (PDT)
Subject: Offer various hats including Red Bull Hats on
	http://www.mlbhatshop.com/
Message-ID: <cf133bd6-0b48-4dc4-98ff-92f0f15b5f87@s15g2000pre.googlegroups.com>

Defending MX2 champion Ken is currently leading the MX2 championship
while Max Nagl heads to his favourite track of the season looking for
points to close the gap on fellow Red Bull Teka KTM Factory Racing
team http://www.mlbhatshop.com/  rider Tony Cairoli.  by red bull
hats.


From tjhanson at yahoo.com  Tue Sep 13 21:44:41 2011
From: tjhanson at yahoo.com (Tim Hanson)
Date: Tue, 13 Sep 2011 18:44:41 -0700
Subject: Need some experience
In-Reply-To: <j4ov1t$bmg$1@dough.gmane.org>
References: <201109131325.06524.tjhanson@yahoo.com>
	<201109131509.42974.tjhanson@yahoo.com>
	<j4ov1t$bmg$1@dough.gmane.org>
Message-ID: <201109131844.41562.tjhanson@yahoo.com>

On Tuesday, September 13, 2011 06:12:27 pm Terry Reedy wrote:
> >> It's a great idea. We are always looking for volunteers that help the
> >> community to reduce the amount of open bugs. The bug tracker at
> >> http://bugs.python.org/ even has a category for beginners. You just have
> >> to search for keyword ->  easy and you'll get a bunch of low hanging
> >> fruits to pick from.
> > 
> > This is exactly what I'm looking for. I don't know who is the "volunteer"
> > here, me for obvious reasons, or the Python community for doing some free
> > hand-holding.  Now I know how I'll spend the next year.  Thank you!
> 
> Also consider the core-mentorship mailing list and the dev guide at
> http://docs.python.org/devguide

This is equally helpful.  Thanks!


From rantingrick at gmail.com  Tue Sep 13 22:08:34 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 13 Sep 2011 19:08:34 -0700 (PDT)
Subject: PyWart: Itertools module needs attention
References: <f0f36335-b077-41a5-9f40-ca9b0dd8e96d@24g2000yqr.googlegroups.com>
	<mailman.1075.1315928745.27778.python-list@python.org>
Message-ID: <9e8eaa71-6044-422b-ac8f-d3e28ae5751f@b10g2000vbz.googlegroups.com>

On Sep 13, 10:45?am, Ian Kelly <ian.g.ke... at gmail.com> wrote:

> Have you looked at the online itertools documentation at all?
>
> http://docs.python.org/library/itertools.html

Yes the online docs are much better. I really like the source code
showing the inner workings of the methods. However i always get upset
when i see poorly thought out doc-strings. My philosophy is that we
should use the built in help function first and only visit the
documentation if more instruction is needed.


I may need to create another PyWart on the topic of doc-strings and
how the author of these strings needs to forget everything he knows
and imagine he is a complete python neophyte. I remember my initial
frustrations learning about functions (in another life it seems) and
my inability to grasp the concept was due to poor examples. I believe
the author use the Fibonacci sequence as an example (Python docs use
this example also). What an idiot!

What does conditionals, linear assignment, loops, the print function,
in-place addition, logic, blah, blah, have to do with understanding a
function... NOTHING! The most basic and by far the best first example
for functions (in any language) is this...

def add(x, y):
    return x + y

Followed by this...

def sub(x,y):
    return x - y

Simple and to the point. It simply reeks of "ah ha"! I dare anyone to
create a better introductory function example. Dear Tutorial Writer:
When writing tutorials please check your ego at the door. Thank you.


From anacrolix at gmail.com  Tue Sep 13 22:23:52 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Wed, 14 Sep 2011 12:23:52 +1000
Subject: GIL switch interval
Message-ID: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>

i'm curious as to what can be done with (and handled better) by
adjusting sys.setswitchinterval
i've opened a question on SO for this, that people might find of
interest: http://stackoverflow.com/questions/7376776/sys-setswitchinterval-in-python-3-2-and-beyond


From 1248283536 at qq.com  Tue Sep 13 22:39:36 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Wed, 14 Sep 2011 10:39:36 +0800
Subject: Connection reset by peer
Message-ID: <tencent_155691551F0AD81E7C0C9D4B@qq.com>

there is a multi-threads program  dowloading  data from yahoo,the main structure is as the following(omit something  unimportant )


class   webdata(object):
    def  __init__(self,name):
        self.jobs = Queue.Queue()
        if  x  in  name:
            self.jobs.put(x)
    def  download(self):
       try:
            weburl=self.jobs.get()
            url = weburl
            hx = httplib2.Http()
            resp, content = hx.request(url, headers=headers)               
            print
            self.jobs.task_done()
        except:
            print  url,"wrong"
            self.jobs.task_done()
   
    def  run(self):       
        for i in range(30):
                  threading.Thread(target=self.download).start()  
        self.jobs.join()
   
if  __name__=="__main__": 
     webdata('quote').run()



quote  is  a  list  which  i want to download,i was confused ,this program  can download something,
can't download something,
when i cancel  try,except , i get the output:
File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1436, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1188, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1171, in _conn_request
    content = response.read()
  File "/usr/lib/python2.7/httplib.py", line 541, in read
    return self._read_chunked(amt)
  File "/usr/lib/python2.7/httplib.py", line 590, in _read_chunked
    value.append(self._safe_read(chunk_left))
  File "/usr/lib/python2.7/httplib.py", line 647, in _safe_read
    chunk = self.fp.read(min(amt, MAXAMOUNT))
  File "/usr/lib/python2.7/socket.py", line 380, in read
    data = self._sock.recv(left)
error: [Errno 104] Connection reset by peer

i  want to know,  my  computer(client)  reset  it  ,or  the yahoo (server)  reset it ,what is the peer??
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From stefan_ml at behnel.de  Wed Sep 14 00:12:53 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 14 Sep 2011 06:12:53 +0200
Subject: stackoverflow and c.l.py (was: GIL switch interval)
In-Reply-To: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
Message-ID: <j4p9k5$7ij$1@dough.gmane.org>

Matt Joiner, 14.09.2011 04:23:
> i'm curious as to what can be done with (and handled better) by
> adjusting sys.setswitchinterval
> i've opened a question on SO for this, that people might find of
> interest: http://stackoverflow.com[...]

I wonder why people ask this kind of question on stackoverflow, and then 
come here asking people to go over there, read the question, and 
(potentially) provide an answer.

IMHO, c.l.py is a much better place to ask Python(-related) questions than 
stackoverflow. It's also a much better place to search for an answer that 
is already available in the archives.

Stefan



From steve+comp.lang.python at pearwood.info  Wed Sep 14 01:35:37 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 14 Sep 2011 15:35:37 +1000
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
Message-ID: <4e703d2b$0$29967$c3e8da3$5496439d@news.astraweb.com>

On Wed, 14 Sep 2011 02:12 pm Stefan Behnel wrote:

> Matt Joiner, 14.09.2011 04:23:
>> i'm curious as to what can be done with (and handled better) by
>> adjusting sys.setswitchinterval
>> i've opened a question on SO for this, that people might find of
>> interest: http://stackoverflow.com[...]
> 
> I wonder why people ask this kind of question on stackoverflow, and then
> come here asking people to go over there, read the question, and
> (potentially) provide an answer.

You should post that question on stackoverflow, and ask them to reply here.



-- 
Steven



From vincent.vandevyvre at swing.be  Wed Sep 14 01:53:50 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 07:53:50 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
Message-ID: <4E70416E.5090208@swing.be>

An HTML attachment was scrubbed...
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From questions.anon at gmail.com  Wed Sep 14 02:08:00 2011
From: questions.anon at gmail.com (questions anon)
Date: Wed, 14 Sep 2011 16:08:00 +1000
Subject: memory error
Message-ID: <CAN_=ogtoNm2Y2ubP9ou7h+fkQJXBQdNF26hJW79jH28tqdUrCg@mail.gmail.com>

Hello All,
I keep coming across a memory error when processing many netcdf files. I
assume it has something to do with how I loop things and maybe need to close
things off properly.
In the code below I am looping through a bunch of netcdf files (each file is
hourly data for one month) and within each netcdf file I am outputting a
*png file every three hours.
This works for one netcdf file but when it begins to process the next netcdf
file I receive this memory error:

*Traceback (most recent call last):
  File
"d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
line 44, in <module>
    TSFC=ncfile.variables['T_SFC'][:]
  File "netCDF4.pyx", line 2473, in netCDF4.Variable.__getitem__
(netCDF4.c:23094)
MemoryError*

To reduce processing requirements I have tried making the LAT and LON to
only use [0] but I also receive an error:

*Traceback (most recent call last):
  File
"d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
line 75, in <module>
    x,y=map(*N.meshgrid(LON,LAT))
  File "C:\Python27\lib\site-packages\numpy\lib\function_base.py", line
3256, in meshgrid
    numRows, numCols = len(y), len(x)  # yes, reversed
TypeError: len() of unsized object*

finally I have added gc.collect() in a couple of places but that doesn't
seem to do anything to help.
I am using :*Python 2.7.2 |EPD 7.1-2 (32-bit)| (default, Jul  3 2011,
15:13:59) [MSC v.1500 32 bit (Intel)] on win32*
Any feedback will be greatly appreciated!


from netCDF4 import Dataset
import numpy
import numpy as N
import matplotlib.pyplot as plt
from numpy import ma as MA
from mpl_toolkits.basemap import Basemap
from netcdftime import utime
from datetime import datetime
import os
import gc

print "start processing...."

inputpath=r'E:/GriddedData/Input/'
outputpath=r'E:/GriddedData/Validation/'
shapefile1="E:/test_GIS/DSE_REGIONS"
for (path, dirs, files) in os.walk(inputpath):
    for dir in dirs:
        print dir
        sourcepath=os.path.join(path,dir)
        relativepath=os.path.relpath(sourcepath,inputpath)
        newdir=os.path.join(outputpath,relativepath)
        if not os.path.exists(newdir):
            os.makedirs(newdir)

    for ncfile in files:
        if ncfile[-3:]=='.nc':
            print "dealing with ncfiles:", ncfile
            ncfile=os.path.join(sourcepath,ncfile)
            #print ncfile
            ncfile=Dataset(ncfile, 'r+', 'NETCDF4')
            TSFC=ncfile.variables['T_SFC'][:,:,:]
            TIME=ncfile.variables['time'][:]
            LAT=ncfile.variables['latitude'][:]
            LON=ncfile.variables['longitude'][:]
            fillvalue=ncfile.variables['T_SFC']._FillValue
            TSFC=MA.masked_values(TSFC, fillvalue)
            ncfile.close()
            gc.collect()
            print "garbage collected"


            for TSFC, TIME in zip((TSFC[1::3]),(TIME[1::3])):
                print TSFC, TIME
            #convert time from numbers to date and prepare it to have no
symbols for saving to filename
                cdftime=utime('seconds since 1970-01-01 00:00:00')
                ncfiletime=cdftime.num2date(TIME)
                print ncfiletime
                timestr=str(ncfiletime)
                d = datetime.strptime(timestr, '%Y-%m-%d %H:%M:%S')
                date_string = d.strftime('%Y%m%d_%H%M')

                #Set up basemap using mercator projection
http://matplotlib.sourceforge.net/basemap/doc/html/users/merc.html
                map = Basemap(projection='merc',llcrnrlat=-40,urcrnrlat=-33,

llcrnrlon=139.0,urcrnrlon=151.0,lat_ts=0,resolution='i')

            # compute map projection coordinates for lat/lon grid.
                x,y=map(*N.meshgrid(LON,LAT))
                map.drawcoastlines(linewidth=0.5)
                map.readshapefile(shapefile1, 'DSE_REGIONS')
                map.drawstates()

                plt.title('Surface temperature at %s UTC'%ncfiletime)
                ticks=[-5,0,5,10,15,20,25,30,35,40,45,50]
                CS = map.contourf(x,y,TSFC, ticks, cmap=plt.cm.jet)
                l,b,w,h =0.1,0.1,0.8,0.8
                cax = plt.axes([l+w+0.025, b, 0.025, h], )
                cbar=plt.colorbar(CS, cax=cax, drawedges=True)

            #save map as *.png and plot netcdf file

plt.savefig((os.path.join(newdir,'TSFC'+date_string+'UTC.png')))
                plt.close()
                gc.collect()
                print "garbage collected again"
print "end of processing"
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From arnodel at gmail.com  Wed Sep 14 02:20:04 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 14 Sep 2011 07:20:04 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E70416E.5090208@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
	<4E70416E.5090208@swing.be>
Message-ID: <CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>

On 14 September 2011 06:53, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
>
> Hi, trying your code, I have had numbers of errors:

Hi Vincent, thanks for trying it.

> ? File "unpyc3.py", line 55, in <module>
> ??? SETUP_WITH,
> NameError: name 'SETUP_WITH' is not defined
>
> commented it
>
> ? File "unpyc3.py", line 58, in <module>
> ??? STORE_DEREF, DELETE_DEREF,
> NameError: name 'DELETE_DEREF' is not defined
>
> commented it

What version of Python are you running this on?  This is module is
written for Python 3.  It looks like you're using an old version of
Python (before the with statement was introduced - 2.5?)

> ? File "unpyc3.py", line 96, in dec_module
> ??? stream = open(pyc_path, "rb")
> UnboundLocalError: local variable 'pyc_path' referenced before assignment
>
> change pyc_path to path

Thanks, I've fixed that.

--
Arnaud


From ethan at stoneleaf.us  Wed Sep 14 02:47:10 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Tue, 13 Sep 2011 23:47:10 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <4e703d2b$0$29967$c3e8da3$5496439d@news.astraweb.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<mailman.1100.1315973589.27778.python-list@python.org>
	<4e703d2b$0$29967$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E704DEE.6070603@stoneleaf.us>

Steven D'Aprano wrote:
> On Wed, 14 Sep 2011 02:12 pm Stefan Behnel wrote:
> 
>> Matt Joiner, 14.09.2011 04:23:
>>> i'm curious as to what can be done with (and handled better) by
>>> adjusting sys.setswitchinterval
>>> i've opened a question on SO for this, that people might find of
>>> interest: http://stackoverflow.com[...]
>> I wonder why people ask this kind of question on stackoverflow, and then
>> come here asking people to go over there, read the question, and
>> (potentially) provide an answer.
> 
> You should post that question on stackoverflow, and ask them to reply here.

+10!


From vincent.vandevyvre at swing.be  Wed Sep 14 04:13:15 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 10:13:15 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>	<4E70416E.5090208@swing.be>
	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
Message-ID: <4E70621B.2000408@swing.be>

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From duncan.booth at invalid.invalid  Wed Sep 14 04:24:31 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 14 Sep 2011 08:24:31 GMT
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
Message-ID: <Xns9F605E618E6B1duncanbooth@127.0.0.1>

Stefan Behnel <stefan_ml at behnel.de> wrote:

> Matt Joiner, 14.09.2011 04:23:
>> i'm curious as to what can be done with (and handled better) by
>> adjusting sys.setswitchinterval
>> i've opened a question on SO for this, that people might find of
>> interest: http://stackoverflow.com[...]
> 
> I wonder why people ask this kind of question on stackoverflow, and
> then come here asking people to go over there, read the question, and 
> (potentially) provide an answer.
> 
> IMHO, c.l.py is a much better place to ask Python(-related) questions
> than stackoverflow. It's also a much better place to search for an
> answer that is already available in the archives.
> 
If you want an answer to how to get a specific bit of code to work then 
Stackoverflow is better if only because people can see who has already 
answered so don't need to waste time re-answering every trivial little 
question about syntax.

Also there's a theory that people can search for existing answers so only 
one person in the class has to ask how to do their homework. I've never 
actually asked a question on Stackoverflow but I have found the answers to 
a lot of problems I've had.

If you want an open-ended discussion then c.l.py is the place to go. On 
Stackoverflow you would likely just have the question closed pdq.

-- 
Duncan Booth http://kupuguy.blogspot.com


From t at jollybox.de  Wed Sep 14 04:37:13 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 14 Sep 2011 10:37:13 +0200
Subject: Connection reset by peer
In-Reply-To: <tencent_155691551F0AD81E7C0C9D4B@qq.com>
References: <tencent_155691551F0AD81E7C0C9D4B@qq.com>
Message-ID: <4E7067B9.2070102@jollybox.de>

On 14/09/11 04:39, ???? wrote:
> i  want to know,  my  computer(client)  reset  it  ,or  the yahoo
> (server)  reset it ,what is the peer?? 

This refers to your program's peer, as in the entity it's communicating
with. When you're the client, the other party (which, once the
connection is established, is considered to be of equal rank - a peer)
is the server.

tl;dr: yahoo.


From ars.rithika at gmail.com  Wed Sep 14 04:42:31 2011
From: ars.rithika at gmail.com (Selvi Arul)
Date: Wed, 14 Sep 2011 01:42:31 -0700 (PDT)
Subject: www.brunningonline.net/simon/blog/archives/001919.html
Message-ID: <4198c5fe-0444-4006-a9df-6239d56214fd@r8g2000prd.googlegroups.com>

http://123maza.com/65/orange458/


From vincent.vandevyvre at swing.be  Wed Sep 14 04:44:02 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 10:44:02 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E70621B.2000408@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>	<4E70416E.5090208@swing.be>	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
	<4E70621B.2000408@swing.be>
Message-ID: <4E706952.8000201@swing.be>

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From alec.taylor6 at gmail.com  Wed Sep 14 04:44:40 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Wed, 14 Sep 2011 18:44:40 +1000
Subject: Replace pip installed package with latest git version?
Message-ID: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>

Good evening,

I've installed a version of python-creole from pip. How do I upgrade
it to the latest git version?

(Windows 7 x64 SP1)

Thanks for all suggestions,

Alec Taylor


From ars.rithika at gmail.com  Wed Sep 14 04:48:48 2011
From: ars.rithika at gmail.com (Selvi Arul)
Date: Wed, 14 Sep 2011 01:48:48 -0700 (PDT)
Subject: Python Shutdown hook comp.lang.python. My comp.lang.python post.....
Message-ID: <0b5094ac-764c-4374-b58a-b53775b3e521@f24g2000prb.googlegroups.com>

http://123maza.com/65/orange458/


From arnodel at gmail.com  Wed Sep 14 05:31:50 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 14 Sep 2011 10:31:50 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E706952.8000201@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
	<4E70416E.5090208@swing.be>
	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
	<4E70621B.2000408@swing.be> <4E706952.8000201@swing.be>
Message-ID: <CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>

On 14 September 2011 09:44, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
> ? File "unpyc3.py", line 211, in __init__
> ??? for v in code_obj.co_cellvars + code_obj.co_freevars]
> AttributeError: 'NoneType' object has no attribute 'co_cellvars'

Could you show me what you do to get this error?  Thank you,

Arnaud

PS: I've checked; DELETE_DEREF was introduced in Python3.2


From vincent.vandevyvre at swing.be  Wed Sep 14 06:03:49 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Wed, 14 Sep 2011 12:03:49 +0200
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>	<4E70416E.5090208@swing.be>	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>	<4E70621B.2000408@swing.be>	<4E706952.8000201@swing.be>
	<CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>
Message-ID: <4E707C05.70103@swing.be>

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From memilanuk at gmail.com  Wed Sep 14 08:33:54 2011
From: memilanuk at gmail.com (memilanuk)
Date: Wed, 14 Sep 2011 05:33:54 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <j4p9k5$7ij$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org>
Message-ID: <j4q6vj$n8e$1@dough.gmane.org>

On 09/13/2011 09:12 PM, Stefan Behnel wrote:
> Matt Joiner, 14.09.2011 04:23:
>> i'm curious as to what can be done with (and handled better) by
>> adjusting sys.setswitchinterval
>> i've opened a question on SO for this, that people might find of
>> interest: http://stackoverflow.com[...]
>
> I wonder why people ask this kind of question on stackoverflow, and then
> come here asking people to go over there, read the question, and
> (potentially) provide an answer.
>
> IMHO, c.l.py is a much better place to ask Python(-related) questions
> than stackoverflow. It's also a much better place to search for an
> answer that is already available in the archives.
>
> Stefan
>

Just an opinion from the unwashed masses... but I don't see the p0rn 
spam over on SO that I do on c.l.py, for one.  I also seem to generally 
get better results from the search engine there, for two.  Not saying 
one is necessarily better than the other, but just subscribing to the 
feed for the [python] tag on SO has a pretty good SNR...



From rosuav at gmail.com  Wed Sep 14 08:47:15 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 14 Sep 2011 22:47:15 +1000
Subject: stackoverflow and c.l.py
In-Reply-To: <j4q6vj$n8e$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
Message-ID: <CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>

On Wed, Sep 14, 2011 at 10:33 PM, memilanuk <memilanuk at gmail.com> wrote:
> Not saying one is necessarily better than the other, but just subscribing to
> the feed for the [python] tag on SO has a pretty good SNR...

The SNR here isn't bad either. Most of the spam gets filtered out, and
even stuff like Ranting Rick posts can be of some amusement when it's
a slow day...

ChrisA


From memilanuk at gmail.com  Wed Sep 14 09:05:23 2011
From: memilanuk at gmail.com (memilanuk)
Date: Wed, 14 Sep 2011 06:05:23 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<j4p9k5$7ij$1@dough.gmane.org>
	<j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
Message-ID: <j4q8qi$45j$1@dough.gmane.org>

On 09/14/2011 05:47 AM, Chris Angelico wrote:
> The SNR here isn't bad either. Most of the spam gets filtered out, and
> even stuff like Ranting Rick posts can be of some amusement when it's
> a slow day...

I subscribe to the list via Gmane, and if 'most of the spam' gets 
filtered out, I'd hate to see how much gets submitted as I still see 2-5 
minimum blatant spam per day on here.

Rick & Xang Li are two examples of what you *don't* see (or at least I 
don't) @ SO



From anddimario at gmail.com  Wed Sep 14 09:06:39 2011
From: anddimario at gmail.com (Andrea Di Mario)
Date: Wed, 14 Sep 2011 15:06:39 +0200
Subject: Twisted Perspective Broker: get client ip
Message-ID: <CAKBHSgzRvduG26cRF63m+hu_M4k7yHvtW-zYb6G8kAiimTG5bw@mail.gmail.com>

Hi, i'm writing a perspective broker server. Now, i should get the
client IP, that perspective broker writes well in the log. I've tried
to get it from MyRealm with: mind.broker.transport.getPeer(), without
success. I've tried self.transport.getPeer() to, with this result:
exceptions.AttributeError: Listner instance has no attribute 'transport'
It's strange, because PB wrote the client IP, infact in log i've line with:
2011-09-11 16:41:58+0200 [Broker,0,127.0.0.1] ............

Could you suggest me something?
Thanks.
Here the code:

from OpenSSL import SSL
from twisted.internet import reactor, ssl
from ConfigParser import SafeConfigParser
from twisted.python import log
from twisted.spread import pb
from twisted.cred import checkers, portal
from zope.interface import implements
import hashlib

class Listner(pb.Avatar):

   def __init__(self, name):
           self.name = name

   def perspective_getDictionary(self, dictionary):
      print dictionary

   def perspective_simplyAccess(self, access):
      print access

def verifyCallback(connection, x509,  errnum, errdepth, ok):
   if not ok:
      log.msg("Certificato non valido: %s" % x509.get_subject())
      return False
   else:
      log.msg("Connessione stabilita, vertificato valido: %s" %
x509.get_subject())
   return True


class MyRealm:
    implements(portal.IRealm)
    def requestAvatar(self, avatarId, mind, *interfaces):
        if pb.IPerspective not in interfaces:
            raise NotImplementedError
        return pb.IPerspective, Listner(avatarId), lambda:None


if __name__ == "__main__":

       CONFIGURATION = SafeConfigParser()
       CONFIGURATION.read('server.conf')
       PORT = CONFIGURATION.get('general', 'port')
       LOGFILE = CONFIGURATION.get('general', 'log')

        log.startLogging(open(LOGFILE,'a'))


       myContextFactory =
ssl.DefaultOpenSSLContextFactory(CONFIGURATION.get('general',
'keypath'), CONFIGURATION.get('general', 'certpath'))
       ctx = myContextFactory.getContext()
       ctx.set_verify(SSL.VERIFY_PEER |
SSL.VERIFY_FAIL_IF_NO_PEER_CERT, verifyCallback)

       ctx.load_verify_locations(CONFIGURATION.get('general', 'cacert'))

       p = portal.Portal(MyRealm())
       c = checkers.FilePasswordDB('passwords.txt',
caseSensitive=True, cache=True)
       p.registerChecker(c)
       factory = pb.PBServerFactory(p)
       reactor.listenSSL(int(PORT), factory, myContextFactory)
       reactor.run()

-- 
Andrea Di Mario


From gandalf at shopzeus.com  Wed Sep 14 09:08:50 2011
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Wed, 14 Sep 2011 15:08:50 +0200
Subject: stackoverflow and c.l.py
In-Reply-To: <j4q8qi$45j$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<j4p9k5$7ij$1@dough.gmane.org>	<j4q6vj$n8e$1@dough.gmane.org>	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<j4q8qi$45j$1@dough.gmane.org>
Message-ID: <4E70A762.1050701@shopzeus.com>

On 2011-09-14 15:05, memilanuk wrote:
>
> Rick & Xang Li are two examples of what you *don't* see (or at least I 
> don't) @ SO
I knew Xang's name would come up. :-) Epic.



From roy at panix.com  Wed Sep 14 09:42:55 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 14 Sep 2011 09:42:55 -0400
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
	<Xns9F605E618E6B1duncanbooth@127.0.0.1>
Message-ID: <roy-CE7C67.09425514092011@news.panix.com>

In article <Xns9F605E618E6B1duncanbooth at 127.0.0.1>,
 Duncan Booth <duncan.booth at invalid.invalid> wrote:

> If you want an answer to how to get a specific bit of code to work then 
> Stackoverflow is better if only because people can see who has already 
> answered so don't need to waste time re-answering every trivial little 
> question about syntax.

Any halfway decent newsreader application will follow threading and put 
all the responses to a given question in one place.  Of course, this is 
a relatively new feature.  If your newsreader is any older than about 
the mid 1980's, it may not be able to do this.

In article <mailman.1100.1315973589.27778.python-list at python.org>,
 Stefan Behnel <stefan_ml at behnel.de> wrote:

> I wonder why people ask this kind of question on stackoverflow, and then 
> come here asking people to go over there, read the question, and 
> (potentially) provide an answer.

If you ask here you will probably get the correct answer to your 
question (along with some deep dives into related topics, which are 
often more valuable than the original answer).  If you ask on SO, you 
may also get the correct answer, but in addition you will earn SO karma 
points.  Maybe even some neat badge.  I guess it all depends on what 
your goal is.

Obligatory GIL comment -- I wrote some code the other day that used 4 
threads to perform 4 I/O bound operations (fetching 4 jpegs in parallel 
over http).  I figured the fact that they were I/O bound would avoid any 
GIL problems.  I was shocked and dismayed, however, to find that the 4 
operations all got serialized.  I guess I really didn't understand how 
the GIL worked after all.

So, I rewrote it to use the multiprocessing module.  Egads, still 
serialized!  To make a long story short, it turns out we were using some 
crappy consumer-grade Linksys box as our DNS server, and *it* was single 
threaded.  My 4 threads were blocking on name resolution!

We moved to using a real nameserver, and I converted the code back to 
using threading.  Works like a charm now.


From alec.taylor6 at gmail.com  Wed Sep 14 10:26:48 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 15 Sep 2011 00:26:48 +1000
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CAO+9iGefs3Qd=M+TT-jAPxH_PWL_h7yzwfyov8+0fvZfQibpiw@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
	<CAO_FcwkYYQwZCeP-KDMqBEw00b1TXuErzMHQUydg57Pdbidbcg@mail.gmail.com>
	<CAO+9iGefs3Qd=M+TT-jAPxH_PWL_h7yzwfyov8+0fvZfQibpiw@mail.gmail.com>
Message-ID: <CAO+9iGeB=kPDPQk8GDnhBsXRZcBk=Ho0-wW61x6SfLW5Rjadkw@mail.gmail.com>

--editable=git+https://github.com/jedie/python-creole.git is not the right forma
t; it must have #egg=Package

On Wed, Sep 14, 2011 at 10:54 PM, One Murithi <o0murithi at gmail.com> wrote:
> pip install -e <PATH_GIT_CHECKOUT>
> On Wed, Sep 14, 2011 at 11:44 AM, Alec Taylor <alec.taylor6 at gmail.com>
> wrote:
>>
>> Good evening,
>>
>> I've installed a version of python-creole from pip. How do I upgrade
>> it to the latest git version?
>>
>> (Windows 7 x64 SP1)
>>
>> Thanks for all suggestions,
>>
>> Alec Taylor
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
>


From jack.bates at gmail.com  Wed Sep 14 12:22:29 2011
From: jack.bates at gmail.com (Jack Bates)
Date: Wed, 14 Sep 2011 09:22:29 -0700
Subject: ImportError: cannot import name dns
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>
References: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAAuurf+z7VWz=a99fhyMxHPWTO+ZWdNHLCR5MBFeYGQq0P86kQ@mail.gmail.com>

> It is a circular dependency. Dns will try to import udp which will in turn import dns (again) in an endless cycle; instead an ImportError is raised.
>
> Circular dependency is a Bad Thing.

According to this documentation:

http://docs.python.org/reference/simple_stmts.html#grammar-token-import_stmt

http://effbot.org/zone/import-confusion.htm

 - I thought Python would do something like:

1. check for "dns" in sys.modules (initially not found)
2. create new empty module, add it to sys.modules as "dns"
3. execute dns.py in new module namespace (executes "from foo import udp")
4. check for "udp" in sys.modules (not found)
5. create new empty module, add it to sys.modules as "udp"
6. execute udp.py in new module namespace (executes "from foo import dns")
7. check for "dns" in sys.modules (found!)
8. done executing udp.py
9. done executing dns.py

So I'd expect attempting to access symbols from "dns" while executing
udp.py to fail, because dns.py isn't done executing at this point.
However I don't attempt to access any symbols from "dns" - so I don't
expect this ImportError

What is my mistake?


From mickyhulse.lists at gmail.com  Wed Sep 14 12:58:55 2011
From: mickyhulse.lists at gmail.com (Micky Hulse)
Date: Wed, 14 Sep 2011 09:58:55 -0700
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
Message-ID: <CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>

Hello,

On Wed, Sep 14, 2011 at 1:44 AM, Alec Taylor <alec.taylor6 at gmail.com> wrote:
> I've installed a version of python-creole from pip. How do I upgrade
> it to the latest git version?

Not sure if you got an answer yet, but this is how I would do it:

sudo pip install --upgrade
git+git://github.com/jedie/python-creole.git#egg=python-creole

The "sudo" may or may not be required.

<http://www.pip-installer.org/en/latest/index.html>

Hths.

Cheers,
Micky


From mickyhulse.lists at gmail.com  Wed Sep 14 13:06:35 2011
From: mickyhulse.lists at gmail.com (Micky Hulse)
Date: Wed, 14 Sep 2011 10:06:35 -0700
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
	<CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>
Message-ID: <CALri7MkCYnszsYi2ww+0Ar7U6KD4ZtfRHC+=71ZhzVvDUA0tgQ@mail.gmail.com>

On Wed, Sep 14, 2011 at 9:58 AM, Micky Hulse <mickyhulse.lists at gmail.com> wrote:
> Not sure if you got an answer yet, but this is how I would do it:
> sudo pip install --upgrade
> git+git://github.com/jedie/python-creole.git#egg=python-creole

Having read your message more closely, it sounds like you did not
install the package originally form github? If that's the case, I
don't think using --upgrade will be of any help. Sorry 'bout that.

I suppose you would have to uninstall the original PIP version:

sudo pip uninstall egg-name.egg (or just the package name)

... and then:

sudo pip install -e
git+git://github.com/jedie/python-creole.git#egg=python-creole

Although, I am not sure if that is the best way to do it.

Crawling back into my hole now. :)

Micky


From alec.taylor6 at gmail.com  Wed Sep 14 13:11:40 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 15 Sep 2011 03:11:40 +1000
Subject: Replace pip installed package with latest git version?
In-Reply-To: <CALri7MkCYnszsYi2ww+0Ar7U6KD4ZtfRHC+=71ZhzVvDUA0tgQ@mail.gmail.com>
References: <CAO+9iGeBHrshizbyava7fqC6QQCYeuJ4f-1Qjf1zXZ_43sgT4g@mail.gmail.com>
	<CALri7Mn9Z2EnFF+PFP337hQ19+xkYDsmH5TZGqwc9=QV_M=m7g@mail.gmail.com>
	<CALri7MkCYnszsYi2ww+0Ar7U6KD4ZtfRHC+=71ZhzVvDUA0tgQ@mail.gmail.com>
Message-ID: <CAO+9iGc+Yq1WUvn0HHfxdrsg3Mx4VXCe0h1KD=KWFX2gbHYagA@mail.gmail.com>

Thanks, uninstalling first worked.

:D

On Thu, Sep 15, 2011 at 3:06 AM, Micky Hulse <mickyhulse.lists at gmail.com> wrote:
> On Wed, Sep 14, 2011 at 9:58 AM, Micky Hulse <mickyhulse.lists at gmail.com> wrote:
>> Not sure if you got an answer yet, but this is how I would do it:
>> sudo pip install --upgrade
>> git+git://github.com/jedie/python-creole.git#egg=python-creole
>
> Having read your message more closely, it sounds like you did not
> install the package originally form github? If that's the case, I
> don't think using --upgrade will be of any help. Sorry 'bout that.
>
> I suppose you would have to uninstall the original PIP version:
>
> sudo pip uninstall egg-name.egg (or just the package name)
>
> ... and then:
>
> sudo pip install -e
> git+git://github.com/jedie/python-creole.git#egg=python-creole
>
> Although, I am not sure if that is the best way to do it.
>
> Crawling back into my hole now. :)
>
> Micky
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From janssen at parc.com  Wed Sep 14 14:47:18 2011
From: janssen at parc.com (Bill Janssen)
Date: Wed, 14 Sep 2011 11:47:18 PDT
Subject: ANN: PyGUI 2.5
In-Reply-To: <962t3eFgd1U1@mid.individual.net>
References: <mailman.80.1308330149.1164.python-announce-list@python.org>
	<mailman.88.1308338170.1164.python-list@python.org>
	<962t3eFgd1U1@mid.individual.net>
Message-ID: <17012.1316026038@parc.com>

Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:

> Terry Reedy wrote:
> 
> > Greg left out the most important to me:
> > "Now works with Python 3 on MacOSX and Windows!"
> 
> I'm not making too much of that at the moment, because it
> *doesn't* work on Linux yet, and I've no idea how long
> it will be before it does.
> 
> The issue is that there will apparently not be any
> Python 3 version of pygtk, on the grounds that gobject
> introspection can be used instead. Unfortunately,
> Gtk 3 and related libraries don't quite handle gobject
> introspection well enough to support PyGUI at the moment.

One possibility would be to develop a PyGUI branch on top of Tk, so that
it would work with Python anywhere.

Bill


From duncan.booth at invalid.invalid  Wed Sep 14 15:00:50 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 14 Sep 2011 19:00:50 GMT
Subject: stackoverflow and c.l.py (was: GIL switch interval)
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
	<Xns9F605E618E6B1duncanbooth@127.0.0.1>
	<roy-CE7C67.09425514092011@news.panix.com>
Message-ID: <Xns9F60CB9684C2Aduncanbooth@127.0.0.1>

Roy Smith <roy at panix.com> wrote:

> In article <Xns9F605E618E6B1duncanbooth at 127.0.0.1>,
>  Duncan Booth <duncan.booth at invalid.invalid> wrote:
> 
>> If you want an answer to how to get a specific bit of code to work then 
>> Stackoverflow is better if only because people can see who has already 
>> answered so don't need to waste time re-answering every trivial little 
>> question about syntax.
> 
> Any halfway decent newsreader application will follow threading and put 
> all the responses to a given question in one place.  Of course, this is 
> a relatively new feature.  If your newsreader is any older than about 
> the mid 1980's, it may not be able to do this.
> 
Sorry, I evidently didn't make myself clear. On Usenet it could be hours 
before your local server updates with other posts on the thread, on 
Stackoverflow the answers will update live as they are posted.

-- 
Duncan Booth http://kupuguy.blogspot.com


From t at jollybox.de  Wed Sep 14 15:34:38 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 14 Sep 2011 21:34:38 +0200
Subject: stackoverflow and c.l.py
In-Reply-To: <Xns9F60CB9684C2Aduncanbooth@127.0.0.1>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<mailman.1100.1315973589.27778.python-list@python.org>
	<Xns9F605E618E6B1duncanbooth@127.0.0.1>
	<roy-CE7C67.09425514092011@news.panix.com>
	<Xns9F60CB9684C2Aduncanbooth@127.0.0.1>
Message-ID: <4E7101CE.7060103@jollybox.de>

On 14/09/11 21:00, Duncan Booth wrote:
> Roy Smith <roy at panix.com> wrote:
> 
>> In article <Xns9F605E618E6B1duncanbooth at 127.0.0.1>,
>>  Duncan Booth <duncan.booth at invalid.invalid> wrote:
>>
>>> If you want an answer to how to get a specific bit of code to work then 
>>> Stackoverflow is better if only because people can see who has already 
>>> answered so don't need to waste time re-answering every trivial little 
>>> question about syntax.
>>
>> Any halfway decent newsreader application will follow threading and put 
>> all the responses to a given question in one place.  Of course, this is 
>> a relatively new feature.  If your newsreader is any older than about 
>> the mid 1980's, it may not be able to do this.
>>
> Sorry, I evidently didn't make myself clear. On Usenet it could be hours 
> before your local server updates with other posts on the thread, on 
> Stackoverflow the answers will update live as they are posted.

The mailing list python-list, however, doesn't have this problem.
(unless when people post from slow USENET servers of course...)


From tim at akwebsoft.com  Wed Sep 14 15:50:44 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Wed, 14 Sep 2011 11:50:44 -0800
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
Message-ID: <20110914195044.GK4331@johnsons-web.com>

I have written a class that uses ftplib.FTP as the parent.
I need to reconcile the modified time of a workstation file with
that same filename on a remote server.
Let's say we have a file called '400.shtml'. I get the mtime on
my workstation by
>> os.path.getmtime('400.shtml')
1311648420.0
And I use 
>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
'213 20110726004703'

My question is how to compare the two outputs?
Pointers to documentation and other resources are invited.

thanks
-- 
Tim 
tim at johnsons-web dot com or akwebsoft dot com
http://www.akwebsoft.com


From arnodel at gmail.com  Wed Sep 14 15:51:37 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 14 Sep 2011 20:51:37 +0100
Subject: ANN: unpyc3 - a python bytecode decompiler for Python3
In-Reply-To: <4E707C05.70103@swing.be>
References: <CAJ6cK1ZbUGkckCXiBTA_WUu4dMvWwJZ+u37qoOrUQSVVOGGubQ@mail.gmail.com>
	<4E70416E.5090208@swing.be>
	<CAJ6cK1auQiCvybApGMJwRbiat1_ABNmyq+n9t3V0soW9AZ++Fg@mail.gmail.com>
	<4E70621B.2000408@swing.be> <4E706952.8000201@swing.be>
	<CAJ6cK1Zs8zEsmDxohgFtyNjpgcT+KQjo78G=BXmur44ZF2LWzQ@mail.gmail.com>
	<4E707C05.70103@swing.be>
Message-ID: <CAJ6cK1b-UC-kvKRmS1XQSMYqYB6OQoNd6mo-Y2eWYA7Kq-mWgw@mail.gmail.com>

On 14 September 2011 11:03, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
> Le 14/09/11 11:31, Arnaud Delobelle a ?crit?:
[...]
> Could you show me what you do to get this error?  Thank you,

> [vincent at myhost unpyc3]$ python
> Python 3.2.1 (default, Jul 11 2011, 12:37:47)
> [GCC 4.6.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from unpyc3 import decompile
>>>> print (decompile("shredder.pyc"))
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "unpyc3.py", line 110, in decompile
> ??? return dec_module(obj)
> ? File "unpyc3.py", line 99, in dec_module
> ??? code = Code(code_obj)
> ? File "unpyc3.py", line 211, in __init__
> ??? for v in code_obj.co_cellvars + code_obj.co_freevars]
> AttributeError: 'NoneType' object has no attribute 'co_cellvars'
>>>> print (decompile("unpyc3.pyc"))
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "unpyc3.py", line 110, in decompile
> ??? return dec_module(obj)
> ? File "unpyc3.py", line 99, in dec_module
> ??? code = Code(code_obj)
> ? File "unpyc3.py", line 211, in __init__
> ??? for v in code_obj.co_cellvars + code_obj.co_freevars]
> AttributeError: 'NoneType' object has no attribute 'co_cellvars'
>>>> import os
>>>> os.path.isfile("shredder.pyc")
> True
>>>> os.path.isfile("unpyc3.pyc")
> True
>>>>
>
> it seems the return of marshal.load(stream) is None

I think the reason may be that your unpyc3.pyc and shredder.pyc files
were compiled with a different version of python and the read_code
function returns None because the magic number in the .pyc file is
incorrect because of these two lines:

    if magic != imp.get_magic():
        return None

I have now changed this so that it loads the file anyway but prints a
warning.  I guess this may break badly though.

In Python 3.2, .pyc files are "hidden" in a __pycache__ directory.  So
the Python 3.2 specific unpyc3.pyc file for example is probably
located at .../unpyc3/__pycache__/unpyc3-cpython-32.pyc

The easiest way to find the path of the .pyc file if you know the path
of the .py file is probably as follows:

>>> import imp
>>> imp.cache_from_source("unpyc3.py")
'__pycache__/unpyc3.cpython-32.pyc'

Here's an example decompiling the dis module from the standard library:

>>> import dis
>>> dis.__file__
'/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/dis.py'
>>> imp.cache_from_source(dis.__file__)
'/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/__pycache__/dis.cpython-32.pyc'
>>> print(decompile(_))
__doc__ = 'Disassembler of Python byte code into mnemonics.'
import sys
import types
from opcode import *
from opcode import __all__ as _opcodes_all
__all__ = ['code_info', 'dis', 'disassemble', 'distb', 'disco',
'findlinestarts', 'findlabels', 'show_code'] + _opcodes_all
del _opcodes_all
_have_code = types.MethodType, types.FunctionType, types.CodeType, type
def _try_compile(source, name):
    try:
        c = compile(source, name, 'eval')
    except SyntaxError:
        c = compile(source, name, 'exec')
    return c
[... many more lines ...]

I hope this will work for you,

-- 
Arnaud

PS: I've also added support for the IMPORT_STAR opcode which I had overlooked.


From badouglas at gmail.com  Wed Sep 14 16:16:41 2011
From: badouglas at gmail.com (bruce)
Date: Wed, 14 Sep 2011 13:16:41 -0700
Subject: libxml2dom quesiton
Message-ID: <CAP16ngp3-RgajfhtkvuW2dT9-5HvYtDBDYqeO5DJPMUo=P-j_w@mail.gmail.com>

Hi.

Test question. Trying to see how to insert a test node into an
existing dom tree. For the test, it has a TR/TD with a
td[@class="foo"] that has an associated TR..

Trying to figure out how out how to insert a "<DIV></DIV>" around the
tr/td in question...

Curious as to how to accomplish this.

Thoughts/pointers.

thanks



--------------------------
sample code/html chunk follows:

import libxml2dom

  text is below

    tt = libxml2dom.parseString(text, html=1)
    t1path_=tt.xpath(t1path)

    aa=tt.createElement("<div>")
    print len(t1path_)
    for a in t1path_:

      tt.insertBefore(aa,None)
      print a.nodeName
      print a.toString()

    sys.exit()

--------------------------------------------

s3==
<html>
<body>
<tr>
<td class="foo">
</td>
</tr>
<tr>
<td>
</td>
</tr>
<tr>
<td class="foo">
</td>
</tr>
</body>
</html>


trying to get::
<html>
<body>
<div>
<tr>
<td class="foo">
</td>
</tr>
</div>
<tr>
<td>
</td>
</tr>
<div>
<tr>
<td class="foo">
</td>
</tr>
</div>
</body>
</html>


From ladasky at my-deja.com  Wed Sep 14 16:47:50 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Wed, 14 Sep 2011 13:47:50 -0700 (PDT)
Subject: Accessing matplotlib-users discussion group?
Message-ID: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>

Hi folks,

Apologies if this is a bit off-topic, but there must be another
Pythoneer out there who can help me navigate my current problem.

I'm working with matplotlib, the Python graphing package.  I need to
ask some questions about it, and the place to ask those questions
would appear to be the matplotlib-users discussion group.  Matplotlib-
users appears to be hosted on sourceforge.net (and is not mirrored
anywhere else?), so I tried to sign up for an account (at
https://sourceforge.net/user/registration).

Yesterday, after filling out the registration page, Sourceforge
rejected my registration, without any notice that I observed.  Today,
I tried that registration again.  This time, on the upper right corner
of the rejection page, I saw the following message: "your registration
violated our anti-spam filter."

WTF?

I tried searching Sourceforge for information on what their anti-spam
filter is, and how my registration could possibly have violated it.  I
found nothing.

If anyone out there can tell me how 1) I can actually register with
Sourceforge, or 2) how I might post to matplotlib-users without
bothering with Sourceforge, I would be most grateful!


From anikom15 at gmail.com  Wed Sep 14 18:26:40 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 14 Sep 2011 15:26:40 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
Message-ID: <20110914222640.GA4942@Smoke>

On Wed, Sep 14, 2011 at 10:47:15PM +1000, Chris Angelico wrote:
> On Wed, Sep 14, 2011 at 10:33 PM, memilanuk <memilanuk at gmail.com> wrote:
> > Not saying one is necessarily better than the other, but just subscribing to
> > the feed for the [python] tag on SO has a pretty good SNR...
> 
> The SNR here isn't bad either. Most of the spam gets filtered out, and
> even stuff like Ranting Rick posts can be of some amusement when it's
> a slow day...
> 
> ChrisA

And IMO the quality of [Python] code here is better than at SO.


From anikom15 at gmail.com  Wed Sep 14 18:27:58 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 14 Sep 2011 15:27:58 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <j4q8qi$45j$1@dough.gmane.org>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<j4q8qi$45j$1@dough.gmane.org>
Message-ID: <20110914222757.GB4942@Smoke>

On Wed, Sep 14, 2011 at 06:05:23AM -0700, memilanuk wrote:
> On 09/14/2011 05:47 AM, Chris Angelico wrote:
> >The SNR here isn't bad either. Most of the spam gets filtered out, and
> >even stuff like Ranting Rick posts can be of some amusement when it's
> >a slow day...
> 
> I subscribe to the list via Gmane, and if 'most of the spam' gets
> filtered out, I'd hate to see how much gets submitted as I still see
> 2-5 minimum blatant spam per day on here.
> 
> Rick & Xang Li are two examples of what you *don't* see (or at least
> I don't) @ SO
>

I don't understand the matter of spam and trolls.  You can just delete
it if you don't want it.  It's not like we're getting thousands per day.


From rhodri at wildebst.demon.co.uk  Wed Sep 14 19:26:06 2011
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 15 Sep 2011 00:26:06 +0100
Subject: stackoverflow and c.l.py
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
Message-ID: <op.v1tndssza8ncjz@gnudebst>

On Wed, 14 Sep 2011 14:05:23 +0100, memilanuk <memilanuk at gmail.com> wrote:

> Rick & Xang Li are two examples of what you *don't* see (or at least I  
> don't) @ SO

Then you haven't been looking hard enough ;-)

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


From steve+comp.lang.python at pearwood.info  Wed Sep 14 19:58:32 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 15 Sep 2011 09:58:32 +1000
Subject: stackoverflow and c.l.py
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>	<j4p9k5$7ij$1@dough.gmane.org>
	<j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
Message-ID: <4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>

memilanuk wrote:

> On 09/14/2011 05:47 AM, Chris Angelico wrote:
>> The SNR here isn't bad either. Most of the spam gets filtered out, and
>> even stuff like Ranting Rick posts can be of some amusement when it's
>> a slow day...
> 
> I subscribe to the list via Gmane, and if 'most of the spam' gets
> filtered out, I'd hate to see how much gets submitted as I still see 2-5
> minimum blatant spam per day on here.

2-5 spam posts is nothing. (Well, I know any spam is too much spam, but
still.) Since nearly all of it is obvious, it's easy to filter out of your
mail client, news client, or if all else fails, your attention. The hard
ones to ignore are the ones that look like they might be legitimate, but
fortunately most spammers are too lazy or stupid to bother with even the
most feeble disguise.

Either way, I don't consider half a dozen spam posts a day to be anything
more than a minor distraction.

Commercial spam is annoying, but otherwise harmless because it is so easy to
filter. What's really the problem is crackpots, trollers and griefers,
because there is a terrible temptation to engage them in debate: "someone
is wrong on the Internet!". If you want to see a news group gone bad, go to
something like sci.math. You can't move for the cranks "disproving"
Cantor's Diagonal Theorem and Special Relativity and proving that 10**603
is the One True Actual Infinity (I'm not making that last one up!).



-- 
Steven



From clp2 at rebertia.com  Wed Sep 14 20:41:51 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 17:41:51 -0700
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
In-Reply-To: <20110914195044.GK4331@johnsons-web.com>
References: <20110914195044.GK4331@johnsons-web.com>
Message-ID: <CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>

On Wed, Sep 14, 2011 at 12:50 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> I have written a class that uses ftplib.FTP as the parent.
> I need to reconcile the modified time of a workstation file with
> that same filename on a remote server.
> Let's say we have a file called '400.shtml'. I get the mtime on
> my workstation by
>>> os.path.getmtime('400.shtml')
> 1311648420.0

http://docs.python.org/library/os.path.html#os.path.getmtime
Your sample seems to be a typical Unix timestamp:
http://en.wikipedia.org/wiki/Unix_time

> And I use
>>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
> '213 20110726004703'

RFC 3659 - Extensions to FTP
Sec 3. File Modification Time (MDTM)
http://tools.ietf.org/html/rfc3659#section-3

(Note: Code 213 = File status response)

> My question is how to compare the two outputs?
> Pointers to documentation and other resources are invited.

Cheers,
Chris


From du at baow.com  Wed Sep 14 21:23:46 2011
From: du at baow.com (=?UTF-8?B?5paH5bGxIOadnA==?=)
Date: Wed, 14 Sep 2011 18:23:46 -0700 (PDT)
Subject: A documents editor in Firefox with Python Sphinx tool
Message-ID: <5b7cd4f0-f3ff-49a1-af00-e899ecb1e93d@z7g2000vbp.googlegroups.com>

Baow is a tool that makes it easy to organize your internet resources
and create intelligent and beautiful web pages within Firefox web
browser.

Highlights :

     * Tree based outline, help you organize internet resources and
documents.
     * Save or bookmark web images, files or pages.
     * Multi level project management.
     * Full text search.
     * Generate web pages by Python Sphinx tools,
http://sphinx.pocoo.org . Lots of quick menus help you write and
preview
Python Sphinx and reStructuredText markup documents.
     * Multi platform support, Windows, Linux, Mac, etc.

Home page:  https://addons.mozilla.org/en-US/firefox/addon/baow/


From nevesagar at gmail.com  Wed Sep 14 21:41:43 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 07:11:43 +0530
Subject: help regarding re.search
Message-ID: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>

Hi,
I have a small program where I want to do just a small regex operation.
I want to see if value of a variable 'A' is present in an another variable
'B'.  The below code works fine but as soon as the variable 'A' has some
string including a dot it fails.

for example say:
B="xxxxyyyydpkg.ipazzzzz
The code works fine  when A="dpkg"
however the code does not work when A="dpkg.ipa"

if re.search(A,B):
      # do something.

Can somebody please help me ?
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From nevesagar at gmail.com  Wed Sep 14 21:46:06 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 07:16:06 +0530
Subject: help regarding re.search
In-Reply-To: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
Message-ID: <CAP8kui=CMor_sdfbf9-ssdVD2=dN+zUFtM-PxS9JEXHGDuoYSw@mail.gmail.com>

Hi,
I have a small program where I want to do just a small regex operation.
I want to see if value of a variable 'A' is present in an another variable
'B'.  The below code works fine but as soon as the variable 'A' has some
string including a dot it fails.

for example say:
B="xxxxyyyydpkg.ipazzzzz
The code works fine  when A="dpkg"
however the code does not work when A="dpkg.ipa"

if re.search(A,B):
      # do something.

Can somebody please help me ?
-------------- next part --------------
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From clp2 at rebertia.com  Wed Sep 14 21:55:12 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 18:55:12 -0700
Subject: help regarding re.search
In-Reply-To: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
Message-ID: <CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>

On Wed, Sep 14, 2011 at 6:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> Hi,
> I have a small program where I want to do just a small regex operation.
> I want to see if value of a variable 'A' is present in an another variable
> 'B'.? The below code works fine but as soon as the variable 'A' has some
> string including a dot it fails.

There's no need to use regexes at all! Just do:
if A in B:
    # do something

> for example say:
> B="xxxxyyyydpkg.ipazzzzz
> The code works fine? when A="dpkg"
> however the code does not work when A="dpkg.ipa"

Right, because period is a regex metacharacter. To have it treated as
a literal character to match, escape it:
http://docs.python.org/library/re.html#re.escape

Cheers,
Chris
--
http://rebertia.com


From chris at rebertia.com  Wed Sep 14 21:57:54 2011
From: chris at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 18:57:54 -0700
Subject: Problem with Dos command by python script
In-Reply-To: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
References: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
Message-ID: <CAMZYqRR4W_vMQt7mRxZpTux0iiiaP4KekNWf1Z4V0oMfnM8y1Q@mail.gmail.com>

On Wed, Sep 14, 2011 at 1:13 PM, Jonatas Emidio <jonatasemidio at gmail.com> wrote:
> Here i come!!
>
> I have the following problem...
> I need run by python script a string with some "DOS commands - Windows
> prompt"!!
> For exemple:
> print 'cd temp'
> print 'mkdir temp_app'
>
> How can i run this string in the python, but as a DOS interpreter?

Use the `subprocess` module, and pass shell=True.
http://docs.python.org/library/subprocess.html

Cheers,
Chris


From tim at akwebsoft.com  Wed Sep 14 22:02:42 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Wed, 14 Sep 2011 18:02:42 -0800
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
In-Reply-To: <CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>
References: <20110914195044.GK4331@johnsons-web.com>
	<CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>
Message-ID: <20110915020242.GL4331@johnsons-web.com>

* Chris Rebert <clp2 at rebertia.com> [110914 16:46]:
> On Wed, Sep 14, 2011 at 12:50 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> > I have written a class that uses ftplib.FTP as the parent.
> > I need to reconcile the modified time of a workstation file with
> > that same filename on a remote server.
> > Let's say we have a file called '400.shtml'. I get the mtime on
> > my workstation by
> >>> os.path.getmtime('400.shtml')
> > 1311648420.0
> 
> http://docs.python.org/library/os.path.html#os.path.getmtime
> Your sample seems to be a typical Unix timestamp:
 Yup. Needs to be converted to a timedate stamp, methinks.
> http://en.wikipedia.org/wiki/Unix_time
  I'll look at that tomorrow. Late here.  
> > And I use
> >>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
> > '213 20110726004703'
 
> RFC 3659 - Extensions to FTP
> Sec 3. File Modification Time (MDTM)
> http://tools.ietf.org/html/rfc3659#section-3
> 
> (Note: Code 213 = File status response)
  and '213 20110726004703'[4:] should give me
  the string representation of the timedate stamp on the
  remote file.

  Thanks. I will look at the unix_time entry soon.

-- 
Tim 
tim at johnsons-web dot com or akwebsoft dot com
http://www.akwebsoft.com


From elven199208 at gmail.com  Wed Sep 14 22:26:35 2011
From: elven199208 at gmail.com (zhenzhen zhang)
Date: Wed, 14 Sep 2011 19:26:35 -0700 (PDT)
Subject: Offer Red Bull Hats superior in quality and price is favourable on
	http://www.mlbhatshop.com/
Message-ID: <3cc9671e-37d2-4a40-9800-fac7f7a5fdd6@a7g2000yqb.googlegroups.com>

MLBHatShop with Original Red Bull Hats, New Era Hats, Monster Energy
Hats, Red Bull Beanies, DC Hats, Red Bull New Era Hats, Monster
Beanies Sales Promotion. Door to Door Free Shipping. http://www.mlbhatshop.com/


From anikom15 at gmail.com  Wed Sep 14 23:05:40 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 14 Sep 2011 20:05:40 -0700
Subject: stackoverflow and c.l.py
In-Reply-To: <4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
	<4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110915030540.GA5695@Smoke>

On Thu, Sep 15, 2011 at 09:58:32AM +1000, Steven D'Aprano wrote:
> memilanuk wrote:
> 
> > On 09/14/2011 05:47 AM, Chris Angelico wrote:
> >> The SNR here isn't bad either. Most of the spam gets filtered out, and
> >> even stuff like Ranting Rick posts can be of some amusement when it's
> >> a slow day...
> > 
> > I subscribe to the list via Gmane, and if 'most of the spam' gets
> > filtered out, I'd hate to see how much gets submitted as I still see 2-5
> > minimum blatant spam per day on here.
> 
> 2-5 spam posts is nothing. (Well, I know any spam is too much spam, but
> still.) Since nearly all of it is obvious, it's easy to filter out of your
> mail client, news client, or if all else fails, your attention. The hard
> ones to ignore are the ones that look like they might be legitimate, but
> fortunately most spammers are too lazy or stupid to bother with even the
> most feeble disguise.
> 
> Either way, I don't consider half a dozen spam posts a day to be anything
> more than a minor distraction.
> 
> Commercial spam is annoying, but otherwise harmless because it is so easy to
> filter. What's really the problem is crackpots, trollers and griefers,
> because there is a terrible temptation to engage them in debate: "someone
> is wrong on the Internet!". If you want to see a news group gone bad, go to
> something like sci.math. You can't move for the cranks "disproving"
> Cantor's Diagonal Theorem and Special Relativity and proving that 10**603
> is the One True Actual Infinity (I'm not making that last one up!).
> 
> 
> 

This is really what I love and hate about the internet.  It's full of
people who argue for the sake of venting their internal frustrations.
How many discussions comparing declarative and imperative programming
languages have you seen on the web?  They are everywhere.  Really,
there's no point to these discussions, just use what you like, but it's
still fun to read and think.  This goes into all kinds of subjects.
That said, this post is somewhat of a rant and may spur debate.  It is
what it is, no matter where you are, the internet is just a natural
breeder of this kind of thing.


From nevesagar at gmail.com  Wed Sep 14 23:33:59 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 09:03:59 +0530
Subject: help regarding re.search
In-Reply-To: <CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
Message-ID: <CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>

If A in B:
does nt seem to be working.
Am I missing something here.

-$agar
On Sep 15, 2011 7:25 AM, "Chris Rebert" <clp2 at rebertia.com> wrote:
> On Wed, Sep 14, 2011 at 6:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
>> Hi,
>> I have a small program where I want to do just a small regex operation.
>> I want to see if value of a variable 'A' is present in an another
variable
>> 'B'.  The below code works fine but as soon as the variable 'A' has some
>> string including a dot it fails.
>
> There's no need to use regexes at all! Just do:
> if A in B:
> # do something
>
>> for example say:
>> B="xxxxyyyydpkg.ipazzzzz
>> The code works fine  when A="dpkg"
>> however the code does not work when A="dpkg.ipa"
>
> Right, because period is a regex metacharacter. To have it treated as
> a literal character to match, escape it:
> http://docs.python.org/library/re.html#re.escape
>
> Cheers,
> Chris
> --
> http://rebertia.com
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From clp2 at rebertia.com  Wed Sep 14 23:35:23 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 20:35:23 -0700
Subject: help regarding re.search
In-Reply-To: <CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
Message-ID: <CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>

On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> If A in B:
> does nt seem to be working.
> Am I missing something here.

Please provide a snippet of the code in question, and be specific
about how it's not working.

Cheers,
Chris
--
http://rebertia.com


From greg.ewing at canterbury.ac.nz  Thu Sep 15 00:28:49 2011
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Thu, 15 Sep 2011 16:28:49 +1200
Subject: ANN: PyGUI 2.5
In-Reply-To: <17012.1316026038@parc.com>
References: <mailman.80.1308330149.1164.python-announce-list@python.org>
	<mailman.88.1308338170.1164.python-list@python.org>
	<962t3eFgd1U1@mid.individual.net> <17012.1316026038@parc.com>
Message-ID: <4E717F01.5090806@canterbury.ac.nz>

On 15/09/11 06:47, Bill Janssen wrote:

> One possibility would be to develop a PyGUI branch on top of Tk, so that
> it would work with Python anywhere.

Unfortunately, I doubt whether Tk would be up to the task of
supporting PyGUI efficiently. The philosophies of model-view
separation and allowing more than one view of a model are at
odds with the way Tk works.

Anyone who wants to have a go at it is welcome to try,
though.

-- 
Greg



From nevesagar at gmail.com  Thu Sep 15 00:41:53 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 10:11:53 +0530
Subject: help regarding re.search
In-Reply-To: <CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
Message-ID: <CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>

Here is the code


url="http://xy.yz.com/us/r1000/012/Purple/b1/c6/e2/mzm.dxkjsfbl..d2.dpkg.ipa
"

Man_Param="/us/r1000"
Opt_Param1="Purple"
Opt_Param2="dpkg.ipa"

if (Opt_Param2 in url):
    print "hello."
else:
    print "bye."

It  gives me:

./sample.py: line 9: syntax error near unexpected token `:'
./sample.py: line 9: `if (Opt_Param2 in url):    '


Help.


On Thu, Sep 15, 2011 at 9:05 AM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> > If A in B:
> > does nt seem to be working.
> > Am I missing something here.
>
> Please provide a snippet of the code in question, and be specific
> about how it's not working.
>
> Cheers,
> Chris
> --
> http://rebertia.com
>
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From rosuav at gmail.com  Thu Sep 15 00:49:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 15 Sep 2011 14:49:31 +1000
Subject: help regarding re.search
In-Reply-To: <CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
Message-ID: <CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>

On Thu, Sep 15, 2011 at 2:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> ./sample.py: line 9: syntax error near unexpected token `:'
> ./sample.py: line 9: `if (Opt_Param2 in url):??? '
>

It worked for me in Python 3.2. What version of Python are you using?

ChrisA


From nevesagar at gmail.com  Thu Sep 15 00:54:13 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 10:24:13 +0530
Subject: help regarding re.search
In-Reply-To: <CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
Message-ID: <CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>

I figured it out with the sample program I gave you.   It was my mistake;
However, the same thing with same values is not working in my main program.

Here is what I am trying: The program traverses with correct values upto the
if condition we just discussed; but fails to quality that if condition;
instead it should qualify.


        for key in dictionary:
            m=re.search(key, url)
            if m !=None:
                values=dictionary[key]
                for v in values:
                    v_array=v.split(',')
                    Man_Param=v_array[4]
                    Opt_Param1=v_array[5]
                    Opt_Param2=v_array[6]
                    Cat=v_array[1]
                    Man_Param=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Man_Param)
                    Opt_Param1=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Opt_Param1)
                    Opt_Param2=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Opt_Param2)
                    Cat=re.sub(r'"(?P<dn>.*?)"','\g<dn>', Cat)
                    Cat=re.sub(r':','_', Cat)
                    Cat=re.sub(r' ','_', Cat)
                    print "hello..Man_Param=%s,Opt_Param1=%s,
Opt_Param2=%s\n" %(Man_Param,Opt_Param1,Opt_Param2)
                    #sys.exit(1)
                    if len(Opt_Param1):
                        if len(Opt_Param2):
                            #if (re.search(Man_Param,url) and
re.search(Opt_Param1,url) and re.search(Opt_Param2,url) ):
                            print url
                           * if (Man_Param in url):#and (Opt_Param1 in url)
and (Opt_Param2 in url):    *
                                print "all are found..\n"
                                sys.exit(1)
                                if((int(cl) < 5000 or int(rc) == 206) and
re.match(r"AS_D",Cat) ):
                                    Cat= Cat + "_cont"
                                foutname = "output" + "/" + Cat +"." +
str(cnt)
                                fout =open(foutname, "a")
                                fout.write(line)
                                fout.close
                            else:
                                print "here\n";
                                sys.exit(1)




On Thu, Sep 15, 2011 at 10:19 AM, Chris Angelico <rosuav at gmail.com> wrote:

> On Thu, Sep 15, 2011 at 2:41 PM, Sagar Neve <nevesagar at gmail.com> wrote:
> > ./sample.py: line 9: syntax error near unexpected token `:'
> > ./sample.py: line 9: `if (Opt_Param2 in url):    '
> >
>
> It worked for me in Python 3.2. What version of Python are you using?
>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From kushal.kumaran+python at gmail.com  Thu Sep 15 00:55:19 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Thu, 15 Sep 2011 10:25:19 +0530
Subject: help regarding re.search
In-Reply-To: <CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
Message-ID: <CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>

On Thu, Sep 15, 2011 at 10:11 AM, Sagar Neve <nevesagar at gmail.com> wrote:
> Here is the code
>
>
> url="http://xy.yz.com/us/r1000/012/Purple/b1/c6/e2/mzm.dxkjsfbl..d2.dpkg.ipa"
>
> Man_Param="/us/r1000"
> Opt_Param1="Purple"
> Opt_Param2="dpkg.ipa"
>
> if (Opt_Param2 in url):
> ??? print "hello."
> else:
> ??? print "bye."
>
> It? gives me:
>
> ./sample.py: line 9: syntax error near unexpected token `:'
> ./sample.py: line 9: `if (Opt_Param2 in url):??? '
>
>

That looks like a bash error message.  Syntax errors in python show up
with a stack trace.  Run your program using the python interpreter
like this:

python file.py
OR
python3 file.py

whatever is applicable in your environment.

>
>
> On Thu, Sep 15, 2011 at 9:05 AM, Chris Rebert <clp2 at rebertia.com> wrote:
>>
>> On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com> wrote:
>> > If A in B:
>> > does nt seem to be working.
>> > Am I missing something here.
>>
>> Please provide a snippet of the code in question, and be specific
>> about how it's not working.
>>

-- 
regards,
kushal


From nevesagar at gmail.com  Thu Sep 15 00:58:21 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 10:28:21 +0530
Subject: help regarding re.search
In-Reply-To: <CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
Message-ID: <CAP8kuikH+C5Hnm+iRP_p=zh_J7i4aXET3Dh5K8qwrhRMQ=6VHQ@mail.gmail.com>

Yes. It is been resolved now for the sample program. however, as mentioned
in other post. It is not working in the main program


On Thu, Sep 15, 2011 at 10:25 AM, Kushal Kumaran <
kushal.kumaran+python at gmail.com> wrote:

> On Thu, Sep 15, 2011 at 10:11 AM, Sagar Neve <nevesagar at gmail.com> wrote:
> > Here is the code
> >
> >
> > url="
> http://xy.yz.com/us/r1000/012/Purple/b1/c6/e2/mzm.dxkjsfbl..d2.dpkg.ipa"
> >
> > Man_Param="/us/r1000"
> > Opt_Param1="Purple"
> > Opt_Param2="dpkg.ipa"
> >
> > if (Opt_Param2 in url):
> >     print "hello."
> > else:
> >     print "bye."
> >
> > It  gives me:
> >
> > ./sample.py: line 9: syntax error near unexpected token `:'
> > ./sample.py: line 9: `if (Opt_Param2 in url):    '
> >
> >
>
> That looks like a bash error message.  Syntax errors in python show up
> with a stack trace.  Run your program using the python interpreter
> like this:
>
> python file.py
> OR
> python3 file.py
>
> whatever is applicable in your environment.
>
> >
> >
> > On Thu, Sep 15, 2011 at 9:05 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> >>
> >> On Wed, Sep 14, 2011 at 8:33 PM, Sagar Neve <nevesagar at gmail.com>
> wrote:
> >> > If A in B:
> >> > does nt seem to be working.
> >> > Am I missing something here.
> >>
> >> Please provide a snippet of the code in question, and be specific
> >> about how it's not working.
> >>
>
> --
> regards,
> kushal
>
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From rosuav at gmail.com  Thu Sep 15 01:01:52 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 15 Sep 2011 15:01:52 +1000
Subject: help regarding re.search
In-Reply-To: <CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAH8GtdMAD_rkPkv+x2+8NDmwsCAVg65EzQ27GPvrXnxaxw8Vdg@mail.gmail.com>
Message-ID: <CAPTjJmp1kkK6+hNSm-o3-PwUXu+OCryUPiAqxtF-S1d+LJmZHg@mail.gmail.com>

On Thu, Sep 15, 2011 at 2:55 PM, Kushal Kumaran
<kushal.kumaran+python at gmail.com> wrote:
> That looks like a bash error message. ?Syntax errors in python show up
> with a stack trace. ?Run your program using the python interpreter
> like this:
>
> python file.py
> OR
> python3 file.py
>
> whatever is applicable in your environment.
>

Or add a shebang to the top of your script.

ChrisA


From python at bdurham.com  Thu Sep 15 01:19:20 2011
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 15 Sep 2011 01:19:20 -0400
Subject: Cancel or timeout a long running regular expression
Message-ID: <1316063960.26516.140258141338017@webmail.messagingengine.com>

Is there a way to cancel or timeout a long running regular
expression?

I have a program that accepts regular expressions from users and
I'm concerned about how to handle worst case regular expressions
that seem to run forever. Ideally I'm looking for a way to
evaluate a regular expression and timeout after a specified time
period if the regular expression hasn't completed yet. Or a way
for a user to cancel a long running regular expression.

I was thinking there might be a technique I could use to evaluate
regular expressions in a thread or another process launched via
multiprocessing module and then kill the thread/process after a
specified timeout period. My concern about the multiprocessing
module technique is that launching a process for every regex
evaluation sounds pretty inefficient. And I don't think the
threading module supports the ability to kill threads from
outside a thread itself.

Malcolm
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From matt.pounsett at gmail.com  Thu Sep 15 01:20:19 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Wed, 14 Sep 2011 22:20:19 -0700 (PDT)
Subject: cause __init__ to return a different class?
Message-ID: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>

I'm wondering if there's a way in python to cause __init__ to return a class other than the one initially specified.  My use case is that I'd like to have a superclass that's capable of generating an instance of a random subclass.  

I've tried both returning the subclass (as I would when overloading an operator) but I get the complaint that __init__ wants to return None instead of a type.

The other thing I tried was overwriting 'self' while inside __init__ but that doesn't seem to work either.

class Parent(object):
    def __init__(self, foo):
        if foo == True:
            self = Child(foo)

class Child(Parent):
    def __init__(self, foo):
        pass

Is there a way to do this?  


From GadgetSteve at live.co.uk  Thu Sep 15 01:31:06 2011
From: GadgetSteve at live.co.uk (Gadget/Steve)
Date: Thu, 15 Sep 2011 06:31:06 +0100
Subject: Problem with Dos command by python script
In-Reply-To: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
References: <e77f5be8-d22d-4a94-84f1-458610d5bbd4@f41g2000yqh.googlegroups.com>
Message-ID: <BLU0-SMTP4598BDA85788437F0D376599B070@phx.gbl>

On 14/09/2011 9:13 PM, Jonatas Emidio wrote:
> Here i come!!
>
> I have the following problem...
> I need run by python script a string with some "DOS commands - Windows
> prompt"!!
> For exemple:
> print 'cd temp'
> print 'mkdir temp_app'
>
> How can i run this string in the python, but as a DOS interpreter?
The direct answer to your question is to tell you to take a look at the
subprocess module documentation but if the above is what you would like
to do then take a look as os.chdir(), os.mkdir(), os.mkdirs() and then
do the above in python.


I would also suggest that you should raise this sort of question at
Gadget/Steve



From clp2 at rebertia.com  Thu Sep 15 01:35:26 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 14 Sep 2011 22:35:26 -0700
Subject: cause __init__ to return a different class?
In-Reply-To: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>

On Wed, Sep 14, 2011 at 10:20 PM, Matthew Pounsett
<matt.pounsett at gmail.com> wrote:
> I'm wondering if there's a way in python to cause __init__ to return a class other than the one initially specified. ?My use case is that I'd like to have a superclass that's capable of generating an instance of a random subclass.
<snip>
> Is there a way to do this?

Override __new__() instead:
http://docs.python.org/reference/datamodel.html#object.__new__

Cheers,
Chris


From ryan at rfk.id.au  Thu Sep 15 01:54:06 2011
From: ryan at rfk.id.au (Ryan Kelly)
Date: Thu, 15 Sep 2011 15:54:06 +1000
Subject: cause __init__ to return a different class?
In-Reply-To: <CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
Message-ID: <4E7192FE.7050904@rfk.id.au>

On 15/09/11 15:35, Chris Rebert wrote:
> On Wed, Sep 14, 2011 at 10:20 PM, Matthew Pounsett
> <matt.pounsett at gmail.com> wrote:
>> I'm wondering if there's a way in python to cause __init__ to return a class other than the one initially specified.  My use case is that I'd like to have a superclass that's capable of generating an instance of a random subclass.
> <snip>
>> Is there a way to do this?
> 
> Override __new__() instead:
> http://docs.python.org/reference/datamodel.html#object.__new__


The above will do exactly what you want, but it's generally bad style
unless you have a very specific use-case.  Is there a particular reason
you need to "magically" return a subclass, rather than making this
explicit in the code?

To be friendlier to others reading your code, I would consider using a
classmethod to create an alternative constructor:


   class MyBaseClass(object):

        @classmethod
        def get_random_subclass(cls, *args, **kwds)
            subcls = random.choice(cls.__subclasses__())
            return subcls(*args, **kwds)


To me, this reads pretty cleanly and makes it obvious that something
unusual is going on:

    obj = MyBaseClass.get_random_subclass()

While this hides the intention of the code and would require additional
documentation or comments:

    obj = MyBaseClass()  # note: actually returns a subclass!



Just a thought :-)


  Cheers,

    Ryan


-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details



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From steve+comp.lang.python at pearwood.info  Thu Sep 15 02:00:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 15 Sep 2011 16:00:26 +1000
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <4e71947b$0$29998$c3e8da3$5496439d@news.astraweb.com>

On Thu, 15 Sep 2011 03:20 pm Matthew Pounsett wrote:

> I'm wondering if there's a way in python to cause __init__ to return a
> class other than the one initially specified.  My use case is that I'd
> like to have a superclass that's capable of generating an instance of a
> random subclass.


You need to override the constructor, not the initializer. By the time
__init__ is called, the instance has already been created.


> I've tried both returning the subclass (as I would when overloading an
> operator) but I get the complaint that __init__ wants to return None
> instead of a type.
> 
> The other thing I tried was overwriting 'self' while inside __init__ but
> that doesn't seem to work either.

No, because self is just an ordinary local variable. Overwriting self just
changes the local variable, not the instance.

However, you can sometimes modify the instance's class. One sometimes useful
trick is something like this:


class Test(object):
    def __init__(self):
        if condition():
            self.__class__ = AnotherClass

which will work, and is supported, so long as Test class and AnotherClass
are compatible. (If they're not compatible, you'll get an exception.)



-- 
Steven



From see.my.homepage at gmail.com  Thu Sep 15 02:46:09 2011
From: see.my.homepage at gmail.com (Maciej Sobczak)
Date: Wed, 14 Sep 2011 23:46:09 -0700 (PDT)
Subject: YAMI4 1.4.0 released
Message-ID: <48755301-61d9-4a0e-8baf-52094a719b06@bl1g2000vbb.googlegroups.com>

I am pleased to announce that the 1.4.0 version of YAMI4 is available
for download:

http://www.inspirel.com/yami4

YAMI4 is a messaging solution for distributed systems that supports
Ada, C++, Java, .NET and Python.

An important improvement in the Python module (both for 2.x and 3.x
variants) is that the wrapping interface layer in a natively compiled
module was changed so that previously known bugs in the Python
standard library (ctypes) were bypassed and now the YAMI4 module
should work also on 64-bit
platforms.

Apart from this strictly Python-related improvement, this new release
bring a GUI management console that allows to browse and manage name
servers, message brokers and individual agents in a bigger distributed
system.

--
Maciej Sobczak * http://www.msobczak.com * http://www.inspirel.com


From sajuptpm at gmail.com  Thu Sep 15 03:44:55 2011
From: sajuptpm at gmail.com (sajuptpm)
Date: Thu, 15 Sep 2011 00:44:55 -0700 (PDT)
Subject: Change Location in the google search page
Message-ID: <2fb9a504-eeca-4b95-b844-cc695e63161d@l7g2000vbz.googlegroups.com>

Hi,

I want to open Google search page and Change the Location link in the
left hand nav of Google) from the users current location to a
different location, then return the results of the updated search.

I tried to change google search location through
http://www.google.co.in/preferences?hl=en#loc , but getting error
mechanize._response.httperror_seek_wrapper: HTTP Error 404: Not
Found

Here is the code i tried

========================================= 1

import re
import cookielib
from mechanize import Browser
import mechanize

br1= Browser()
# Cookie Jar
cj = cookielib.LWPCookieJar()
br1.set_cookiejar(cj)

br1.set_handle_robots(False)
br1.addheaders = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686; en-
US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/3.0.1')]

P_URL = "http://www.google.co.in/preferences?hl=en#loc"
s_page = br1.open(P_URL)
loc_form = br1.select_form(name="langform")
br1.form['luul'] = u'bangaluru' # <------ New location
resp = br1.submit()
print "---------resp---------",resp.read()


Output
=======

$ python a11.py
Traceback (most recent call last):
  File "a11.py", line 94, in ?
    resp = br1.submit()
  File "build/bdist.linux-i686/egg/mechanize/_mechanize.py", line 541,
in submit
  File "build/bdist.linux-i686/egg/mechanize/_mechanize.py", line 203,
in open
  File "build/bdist.linux-i686/egg/mechanize/_mechanize.py", line 255,
in _mech_open
mechanize._response.httperror_seek_wrapper: HTTP Error 404: Not Found


========================================= 2


Tried this also, but getting blank google search page.

import re
from mechanize import Browser

LOGIN_URL = "http://www.google.co.in/search?q=new+york
+locksmith&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-
US:official&client=firefox-a"

br = Browser()
br.set_handle_robots(False)
br.addheaders = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686;
en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9
Firefox/3.0.1')]

s_page = br.open(LOGIN_URL)
loc_form = br.select_form(nr=1)
loc_text_fld = br.form.find_control(id='lc-input')
loc_text_fld.__dict__['_value'] = 'kerala' #Change the Location
resp = br.submit()

print "\n\n----------resp----------", resp.read() #Returning blank
google search page.





From gnujohn at gmail.com  Thu Sep 15 04:01:37 2011
From: gnujohn at gmail.com (john)
Date: Thu, 15 Sep 2011 01:01:37 -0700 (PDT)
Subject: stackoverflow and c.l.py
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
	<4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87120dfa-6b7d-4e03-8ff1-6926cc247cbc@bl1g2000vbb.googlegroups.com>

On Sep 14, 4:58?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> memilanuk wrote:
> > On 09/14/2011 05:47 AM, Chris Angelico wrote:
> >> The SNR here isn't bad either. Most of the spam gets filtered out, and
> >> even stuff like Ranting Rick posts can be of some amusement when it's
> >> a slow day...
>
> > I subscribe to the list via Gmane, and if 'most of the spam' gets
> > filtered out, I'd hate to see how much gets submitted as I still see 2-5
> > minimum blatant spam per day on here.
>
> 2-5 spam posts is nothing. (Well, I know any spam is too much spam, but
> still.) Since nearly all of it is obvious, it's easy to filter out of your
> mail client, news client, or if all else fails, your attention. The hard
> ones to ignore are the ones that look like they might be legitimate, but
> fortunately most spammers are too lazy or stupid to bother with even the
> most feeble disguise.
>
> Either way, I don't consider half a dozen spam posts a day to be anything
> more than a minor distraction.
>
> Commercial spam is annoying, but otherwise harmless because it is so easy to
> filter. What's really the problem is crackpots, trollers and griefers,
> because there is a terrible temptation to engage them in debate: "someone
> is wrong on the Internet!". If you want to see a news group gone bad, go to
> something like sci.math. You can't move for the cranks "disproving"
> Cantor's Diagonal Theorem and Special Relativity and proving that 10**603
> is the One True Actual Infinity (I'm not making that last one up!).
>
> --
> Steven

And, all this time, I'd thought it was ((10**603) - 1) that was the
highest.  Oh, well.


From 1248283536 at qq.com  Thu Sep 15 04:28:51 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Thu, 15 Sep 2011 16:28:51 +0800
Subject: method:wrong  structure
Message-ID: <tencent_7D324E33209E90851683965E@qq.com>

there are  three  programs,all of them  left  main  structure,
code0 is ok,i don't know why code2 and code3 can't run,how to fix them?
code0
class   webdata(object):
    def  __init__(self,arg):
          
    def  loadequity(self):
            
    def  loadoption(self):
    
    #loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
  
    def  run(self):      
        
if  __name__=="__main__":
     s=webdata('equity').run()
     s.loadequity()   

code1
class   webdata(object):
    def  __init__(self,arg):
          
    def  loadequity(self):
            
    def  loadoption(self):
    
    loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
  
    def  run(self):        
        
  
if  __name__=="__main__":
     s=webdata('equity').run()
     loadstatus['equity']

wrong output is 
name 'self' is not defined


code2
class   webdata(object):
    def  __init__(self,arg):
          
    def  loadequity(self):
            
    def  loadoption(self):
    
    loadstatus={'equity':loadequity(),'option':loadoption()}
  
    def  run(self):      
        
if  __name__=="__main__":
     s=webdata('equity').run()
     s.loadequity() 

wrong output is :
TypeError: loadequity() takes exactly 1 argument (0 given)
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From clp2 at rebertia.com  Thu Sep 15 04:39:48 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 15 Sep 2011 01:39:48 -0700
Subject: method:wrong structure
In-Reply-To: <tencent_7D324E33209E90851683965E@qq.com>
References: <tencent_7D324E33209E90851683965E@qq.com>
Message-ID: <CAMZYqRTGwy8uNzTN3uTwiD4UcMe2K962ZJuLaCUUJtMJWYzDOA@mail.gmail.com>

2011/9/15 ???? <1248283536 at qq.com>:
> there are? three? programs,all of them? left? main? structure,
> code0 is ok,i don't know why code2 and code3 can't run,how to fix them?
> code0
> class?? webdata(object):
> ??? def? __init__(self,arg):
>
> ??? def? loadequity(self):
>
> ??? def? loadoption(self):
>
> ??? #loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
>
> ??? def? run(self):
>
> if? __name__=="__main__":
> ???? s=webdata('equity').run()
> ???? s.loadequity()
>
> code1
> class?? webdata(object):
> ??? def? __init__(self,arg):
>
> ??? def? loadequity(self):
>
> ??? def? loadoption(self):
>
> ??? loadstatus={'equity':self.loadequity(),'option':self,loadoption()}

Class definitions are executable code. So the assignment to loadstatus
happens *while the class webdata is still being defined*. There is
therefore no class instance object or `self` at this point, hence the
error when you try and do self.loadequity(): you're trying to call an
instance method before it's even possible for there to be instances of
the class.

Cheers,
Chris
--
http://rebertia.com


From rosuav at gmail.com  Thu Sep 15 04:39:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 15 Sep 2011 18:39:53 +1000
Subject: stackoverflow and c.l.py
In-Reply-To: <20110915030540.GA5695@Smoke>
References: <CAB4yi1Nc04-6zw98WW+rss9u80amNbmk7GpMw-b0uHDdiRgC7w@mail.gmail.com>
	<j4p9k5$7ij$1@dough.gmane.org> <j4q6vj$n8e$1@dough.gmane.org>
	<CAPTjJmrnjRmp9HB5GAOC0HBOXfs3Xix5VeJhQCf2f0JprNn0WQ@mail.gmail.com>
	<mailman.1115.1316005538.27778.python-list@python.org>
	<4e713fa9$0$29990$c3e8da3$5496439d@news.astraweb.com>
	<20110915030540.GA5695@Smoke>
Message-ID: <CAPTjJmo=vbktShCwHCQjWbOTsK_TEDGLnN-bSiq6VhFxajTWnA@mail.gmail.com>

On Thu, Sep 15, 2011 at 1:05 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> This is really what I love and hate about the internet. ?It's full of
> people who argue for the sake of venting their internal frustrations.
> How many discussions comparing declarative and imperative programming
> languages have you seen on the web?

Yes, it's both normal and useful on the internet to break off
conversation to argue about a minor technicality. But it's completely
inappropriate in other contexts, to the point that it can be used for
comedy. Two characters, in the middle of a rather heated debate, stop
to discuss grammar:

"Listen - I've come to pinch her!"
"Mercy! Whom?"
"You mean who."
"Nay! It is the accusative after the verb!"

ChrisA


From gelonida at gmail.com  Thu Sep 15 05:05:53 2011
From: gelonida at gmail.com (Gelonida N)
Date: Thu, 15 Sep 2011 11:05:53 +0200
Subject: help regarding re.search
In-Reply-To: <CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>	<CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
	<CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>
Message-ID: <j4sf5h$ads$1@dough.gmane.org>

Hi Sagar,

In order to be able to help you I propose following:

On 09/15/2011 06:54 AM, Sagar Neve wrote:
. . .
>                     print "hello..Man_Param=%s,Opt_Param1=%s,
> Opt_Param2=%s\n" %(Man_Param,Opt_Param1,Opt_Param2)

Change above line into

>                     print "hello..Man_Param=%r,Opt_Param1=%r,
> Opt_Param2=%r\n" %(Man_Param,Opt_Param1,Opt_Param2)


and show us the output of an example which is NOT working.

printing with '%r" might help to show some 'hidden special characters'









From nizamov.shawkat at gmail.com  Thu Sep 15 05:08:50 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Thu, 15 Sep 2011 11:08:50 +0200
Subject: method:wrong structure
In-Reply-To: <tencent_7D324E33209E90851683965E@qq.com>
References: <tencent_7D324E33209E90851683965E@qq.com>
Message-ID: <CAFwQ1SuAt0WjDOsgUYuDEWbV+jitjRW0ssrydJcXkiPQe0dJmg@mail.gmail.com>

>
> ??? loadstatus={'equity':self.loadequity(),'option':self,loadoption()}
>

comma instead of dot after self.


From nevesagar at gmail.com  Thu Sep 15 05:38:12 2011
From: nevesagar at gmail.com (Sagar Neve)
Date: Thu, 15 Sep 2011 15:08:12 +0530
Subject: help regarding re.search
In-Reply-To: <j4sf5h$ads$1@dough.gmane.org>
References: <CAP8kui=Nqo6bDQh-SA-t+KMFs=NrgYYFmnsw6wXATJ8-aTxmZQ@mail.gmail.com>
	<CAMZYqRR5UqHhdKiyLsZqE8DouXDWvFOsUw8OCYfjZ0E9f8iEBg@mail.gmail.com>
	<CAP8kuinJnPv=6U1J6LYZgGk_yUN6PskvHStCo1kEMHUBG1NkuQ@mail.gmail.com>
	<CAMZYqRSiHY3Cz=r=oAioNCUUEz=L1fW4ngLc4xCyPwwpU9mM2A@mail.gmail.com>
	<CAP8kuik0Aq0gc5NvYPU__k96QiSc0uj+nbAezsx685TGzb2o3w@mail.gmail.com>
	<CAPTjJmrmSJbQqAaQfdZmcuxZYbQLTXoYqz9YewP4pj0P5RZfeA@mail.gmail.com>
	<CAP8kuikr9p_6yv_UkjFbMtUAzaA=nVUe_FOWuC63rSXL_Zx2=w@mail.gmail.com>
	<j4sf5h$ads$1@dough.gmane.org>
Message-ID: <CAP8kuimXaniPkRehi_6QXpeeVF4Baqy=XtW-Nvi3fHep69FJcA@mail.gmail.com>

Hey
Thanks.

I just resolved it and yes you are right there was a (hidden) new-line to
it. I found it in a crude way of putting dots before and after.  I was to
post about it here and saw your message.

I was not knowing about %r. Thanks for that. Thats a good addition to my
knowledge.

Thanks a bunch of all. My day is saved.

Best Regards,
Sagar Neve.


On Thu, Sep 15, 2011 at 2:35 PM, Gelonida N <gelonida at gmail.com> wrote:

> Hi Sagar,
>
> In order to be able to help you I propose following:
>
> On 09/15/2011 06:54 AM, Sagar Neve wrote:
> . . .
> >                     print "hello..Man_Param=%s,Opt_Param1=%s,
> > Opt_Param2=%s\n" %(Man_Param,Opt_Param1,Opt_Param2)
>
> Change above line into
>
> >                     print "hello..Man_Param=%r,Opt_Param1=%r,
> > Opt_Param2=%r\n" %(Man_Param,Opt_Param1,Opt_Param2)
>
>
> and show us the output of an example which is NOT working.
>
> printing with '%r" might help to show some 'hidden special characters'
>
>
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From k.sahithi2862 at gmail.com  Thu Sep 15 06:06:43 2011
From: k.sahithi2862 at gmail.com (SAHITHI)
Date: Thu, 15 Sep 2011 03:06:43 -0700 (PDT)
Subject: DEEPIKA PADUKONE IN DUM MARO DUM MOVIE
Message-ID: <c646407e-c23f-4f5e-b29a-023a38c59ed0@l2g2000vbn.googlegroups.com>


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http://southactresstou.blogspot.com/2011/07/kajal-agarwal-in-naperu-shiva.html
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From tartley at tartley.com  Thu Sep 15 06:31:16 2011
From: tartley at tartley.com (Jonathan Hartley)
Date: Thu, 15 Sep 2011 03:31:16 -0700 (PDT)
Subject: cause __init__ to return a different class?
In-Reply-To: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <73c4a919-555b-453c-8cf7-eec3e645e419@glegroupsg2000goo.googlegroups.com>

Perhaps a more idiomatic way of achieving the same thing is to use a factory function, which returns instances of different classes:

  def PersonFactory(foo):
      if foo:
         return Person()
      else:
         return Child()


Apologies if the code is messed up, I'm posting from Google groups web UI.


From arnodel at gmail.com  Thu Sep 15 07:10:58 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Thu, 15 Sep 2011 12:10:58 +0100
Subject: How does a function know the docstring of its code object?
Message-ID: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>

Hi all,

You can do:

def foo():
    "foodoc"
    pass

function = type(lambda:0)
foo2 = function(foo.__code__, globals())
assert foo2.__doc__ == "foodoc"

I am wondering how the function constructor knows that foo.__code__
has a docstring.  I can see that

    foo.__code__.co_consts == ('foodoc',)

But I can't find where in foo.__code__ is stored the information that
the first constant in foo.__code__ is actually a docstring.

-- 
Arnaud


From keymint1498 at gmail.com  Thu Sep 15 08:51:45 2011
From: keymint1498 at gmail.com (superhappyfuntime)
Date: 15 Sep 2011 12:51:45 GMT
Subject: What is wrong with this code?
Message-ID: <nemo-15092011085110@nemo.com>

it's not running. here it is: 



#this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.


#this is defines what means what. you can just read howto.pdf instead 
of this part.
here it is: = '\begin{document}'
it's an article = '\documentclass article'
it's a book = '\documentclass{book}'
it's a letter = '\documentclass{letter}'
it's a report = '\documentclass{report}'
it's called = '\title{'
it's over! = '\end{document}'




#this is where you come in: type what you want below using the terms 
explained in howto.pdf 


 print ('it's an article it's called test} here it is: Hello World! 
it's over!')


-- 
I'm trying a new usenet client for Mac, Nemo OS X, since 0 days.
You can download it at http://www.malcom-mac.com/nemo


From python at mrabarnett.plus.com  Thu Sep 15 09:02:27 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 15 Sep 2011 14:02:27 +0100
Subject: Turkic I and re
Message-ID: <4E71F763.2010109@mrabarnett.plus.com>

I'm interested to know the opinion of Turkish users of the re or regex
module.

When the re module performs a case-insensitive match, it matches 'I'
with 'i'. In Turkish, however, it should match 'I' with '?' and '?'
with 'i'.

The regex module at http://pypi.python.org/pypi/regex currently uses a
compromise, where it matches 'I' with 'i' and also 'I' with '?' and '?'
with 'i'.

I was wondering if it would be preferable to have a TURKIC flag instead
("(?T)" or "(?T:...)" in the pattern).

Without the Turkic flag it would match 'I' with 'i'; with Turkic flag
it would match 'I' with '?' and '?' with 'i'.


From me at alanplum.com  Thu Sep 15 09:16:15 2011
From: me at alanplum.com (Alan Plum)
Date: Thu, 15 Sep 2011 15:16:15 +0200
Subject: Turkic I and re
In-Reply-To: <4E71F763.2010109@mrabarnett.plus.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
Message-ID: <4E71FA9F.8090702@alanplum.com>

On 2011-09-15 15:02, MRAB wrote:
> The regex module at http://pypi.python.org/pypi/regex currently uses a
> compromise, where it matches 'I' with 'i' and also 'I' with '?' and '?'
> with 'i'.
>
> I was wondering if it would be preferable to have a TURKIC flag instead
> ("(?T)" or "(?T:...)" in the pattern).

I think the problem many people ignore when coming up with solutions 
like this is that while this behaviour is pretty much unique for Turkish 
script, there is no guarantee that Turkish substrings won't appear in 
other language strings (or vice versa).

For example, foreign names in Turkish are often given as spelled in 
their native (non-Turkish) script variants. Likewise, Turkish names in 
other languages are often given as spelled in Turkish.

The Turkish 'I' is a peculiarity that will probably haunt us programmers 
until hell freezes over. Unless Turkey abandons its traditional 
orthography or people start speaking only a single language at a time 
(including names), there's no easy way to deal with this.

In other words: the only way to make use of your proposed flag is if you 
have a fully language-tagged input (e.g. an XML document making 
extensive use of xml:lang) and only ever apply regular expressions to 
substrings containing one culture at a time.


From me at alanplum.com  Thu Sep 15 09:24:45 2011
From: me at alanplum.com (Alan Plum)
Date: Thu, 15 Sep 2011 15:24:45 +0200
Subject: using python in web applications
In-Reply-To: <4E6C05CD.3010905@tysdomain.com>
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
	<4E6C05CD.3010905@tysdomain.com>
Message-ID: <4E71FC9D.1080603@alanplum.com>

On 2011-09-11 02:50, Littlefield, Tyler wrote:
> I replied to that one off list I guess, but I figured Django was way 
> more overhead than I wanted, doesn't really fit with solving the speed 
> issue.

Depending on your needs, you may find something like bottle or Flask a 
better choice then.

Django can be scaled down a lot, but it's a full-featured framework at 
its heart. Bottle is pretty minimal (IIRC it doesn't even come with any 
templating). Flask is somewhere in between as it bundles Werkzeug (a 
pure WSGI framework) with Jinja (a template library) with some glue code.

I have used Flask in the past but often found myself implementing half 
of Django anyway, which is why I eventually switched. When I only need a 
bare API with no database and without templates, I usually go for Bottle 
these days.

If you feel like coding closer to the metal and care more about 
performance than readability, you might also find Twisted useful.


From roy at panix.com  Thu Sep 15 09:42:33 2011
From: roy at panix.com (Roy Smith)
Date: Thu, 15 Sep 2011 09:42:33 -0400
Subject: using python in web applications
References: <mailman.924.1315626929.27778.python-list@python.org>
	<53b67f0d-509a-46c4-83c8-7b9783ff1b5c@glegroupsg2000goo.googlegroups.com>
	<4E6C05CD.3010905@tysdomain.com>
	<mailman.1164.1316093103.27778.python-list@python.org>
Message-ID: <roy-1C1F09.09423315092011@news.panix.com>

In article <mailman.1164.1316093103.27778.python-list at python.org>,
 Alan Plum <me at alanplum.com> wrote:

> Django can be scaled down a lot, but it's a full-featured framework at 
> its heart.

You can pick and chose which parts of django you want to use.  You don't 
need to use any of the Django model stuff.  You don't need to use any of 
the template system.  You can tear out all or most of the default 
middleware.  At that point, about all that's left is the route parser 
and dispatch code.  The nice thing about this is that as you 
incrementally discover which pieces of it you really do need, it's easy 
to pull them in.

That being said, we've made a lot of use of Tornado for small 
stand-alone web services with just a couple of routes.  In retrospect, 
it's unclear if there's any justifiable argument for why we use both 
Tornado and Django, other than hysterical raisins.


From johnjohn.tedro at gmail.com  Thu Sep 15 09:44:54 2011
From: johnjohn.tedro at gmail.com (John-John Tedro)
Date: Thu, 15 Sep 2011 13:44:54 +0000
Subject: Turkic I and re
In-Reply-To: <4E71FA9F.8090702@alanplum.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<4E71FA9F.8090702@alanplum.com>
Message-ID: <CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>

On Thu, Sep 15, 2011 at 1:16 PM, Alan Plum <me at alanplum.com> wrote:

> On 2011-09-15 15:02, MRAB wrote:
>
>> The regex module at http://pypi.python.org/pypi/**regex<http://pypi.python.org/pypi/regex>currently uses a
>> compromise, where it matches 'I' with 'i' and also 'I' with '?' and '?'
>> with 'i'.
>>
>> I was wondering if it would be preferable to have a TURKIC flag instead
>> ("(?T)" or "(?T:...)" in the pattern).
>>
>
> I think the problem many people ignore when coming up with solutions like
> this is that while this behaviour is pretty much unique for Turkish script,
> there is no guarantee that Turkish substrings won't appear in other language
> strings (or vice versa).
>
> For example, foreign names in Turkish are often given as spelled in their
> native (non-Turkish) script variants. Likewise, Turkish names in other
> languages are often given as spelled in Turkish.
>
> The Turkish 'I' is a peculiarity that will probably haunt us programmers
> until hell freezes over. Unless Turkey abandons its traditional orthography
> or people start speaking only a single language at a time (including names),
> there's no easy way to deal with this.
>
> In other words: the only way to make use of your proposed flag is if you
> have a fully language-tagged input (e.g. an XML document making extensive
> use of xml:lang) and only ever apply regular expressions to substrings
> containing one culture at a time.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>

Python does not appear to support special cases mapping, in effect, it is
not 100% compliant with the unicode standard.

The locale specific 'i' casing in Turkic is mentioned in 5.18 (Case
Mappings<http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>)
of the unicode standard.
http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180

AFAIK, the case methods of python strings seems to be built around the
assumption that len("string") == len("string".upper()), but some of these
casing rules require that the string grow. Like uppercasing of the german
sharp s "?" which should be translated to the expanded string "SS".
These special cases should be triggered on specific locales, but I have not
been able to verify that the Turkic uppercasing of "i" works on either
python 2.6, 2.7 or 3.1:

  locale.setlocale(locale.LC_ALL, "tr_TR.utf8") # warning, requires turkish
locale on your system.
  ord("i".upper()) == 0x130 # is False for me, but should be True

I wouldn't be surprised if these issues are translated into the 're' module.

The only support appears to be 'L' switch, but it only makes "\w, \W, \b, \B,
\s and \S dependent on the current locale".
Which probably does not yield to the special rules mentioned above, but I
could be wrong. Make sure that your locale is correct and test again.

If you are unsuccessful, I don't see a 'Turkic flag' being introduced into
re module any time soon, given the following from PEP 20
"Special cases aren't special enough to break the rules"

Cheers,
-- John-John Tedro
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From python at mrabarnett.plus.com  Thu Sep 15 10:06:08 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 15 Sep 2011 15:06:08 +0100
Subject: Turkic I and re
In-Reply-To: <CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<4E71FA9F.8090702@alanplum.com>
	<CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
Message-ID: <4E720650.8010101@mrabarnett.plus.com>

On 15/09/2011 14:44, John-John Tedro wrote:
> On Thu, Sep 15, 2011 at 1:16 PM, Alan Plum <me at alanplum.com
> <mailto:me at alanplum.com>> wrote:
>
>     On 2011-09-15 15:02, MRAB wrote:
>
>         The regex module at http://pypi.python.org/pypi/__regex
>         <http://pypi.python.org/pypi/regex> currently uses a
>         compromise, where it matches 'I' with 'i' and also 'I' with '?'
>         and '?'
>         with 'i'.
>
>         I was wondering if it would be preferable to have a TURKIC flag
>         instead
>         ("(?T)" or "(?T:...)" in the pattern).
>
>
>     I think the problem many people ignore when coming up with solutions
>     like this is that while this behaviour is pretty much unique for
>     Turkish script, there is no guarantee that Turkish substrings won't
>     appear in other language strings (or vice versa).
>
>     For example, foreign names in Turkish are often given as spelled in
>     their native (non-Turkish) script variants. Likewise, Turkish names
>     in other languages are often given as spelled in Turkish.
>
>     The Turkish 'I' is a peculiarity that will probably haunt us
>     programmers until hell freezes over. Unless Turkey abandons its
>     traditional orthography or people start speaking only a single
>     language at a time (including names), there's no easy way to deal
>     with this.
>
>     In other words: the only way to make use of your proposed flag is if
>     you have a fully language-tagged input (e.g. an XML document making
>     extensive use of xml:lang) and only ever apply regular expressions
>     to substrings containing one culture at a time.
>
>     --
>     http://mail.python.org/__mailman/listinfo/python-list
>     <http://mail.python.org/mailman/listinfo/python-list>
>
>
> Python does not appear to support special cases mapping, in effect, it
> is not 100% compliant with the unicode standard.
>
> The locale specific 'i' casing in Turkic is mentioned in 5.18 (Case
> Mappings <http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>)
> of the unicode standard.
> http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180
>
> AFAIK, the case methods of python strings seems to be built around the
> assumption that len("string") == len("string".upper()), but some of
> these casing rules require that the string grow. Like uppercasing of the
> german sharp s "?" which should be translated to the expanded string "SS".
> These special cases should be triggered on specific locales, but I have
> not been able to verify that the Turkic uppercasing of "i" works on
> either python 2.6, 2.7 or 3.1:
>
>    locale.setlocale(locale.LC_ALL, "tr_TR.utf8") # warning, requires
> turkish locale on your system.
>    ord("i".upper()) == 0x130 # is False for me, but should be True
>
> I wouldn't be surprised if these issues are translated into the 're' module.
>
There has been some discussion on the Python-dev list about improving
Unicode support in Python 3.

It's somewhat unlikely that Unicode will become locale-dependent in
Python because it would cause problems; you don't want:

     "i".upper() == "I"

to be maybe true, maybe false.

An option would be to specify whether it should be locale-dependent.

> The only support appears to be 'L' switch, but it only makes "\w, \W,
> \b, \B, \s and \S dependent on the current locale".

That flag is for locale-dependent 8-bit encodings. The ASCII (Python
3), LOCALE and UNICODE flags are mutually exclusive.

> Which probably does not yield to the special rules mentioned above, but
> I could be wrong. Make sure that your locale is correct and test again.
>
> If you are unsuccessful, I don't see a 'Turkic flag' being introduced
> into re module any time soon, given the following from PEP 20
> "Special cases aren't special enough to break the rules"
>
That's why I'm interested in the view of Turkish users. The rest of us
will probably never have to worry about it! :-)

(There's a report in the Python bug tracker about this issue, which is
why the regex module has the compromise.)


From ulrich.eckhardt at dominolaser.com  Thu Sep 15 10:17:18 2011
From: ulrich.eckhardt at dominolaser.com (Ulrich Eckhardt)
Date: Thu, 15 Sep 2011 16:17:18 +0200
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
Message-ID: <38d9k8-u8t.ln1@satorlaser.homedns.org>

superhappyfuntime wrote:
> #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.

It's LaTeX, not Python.

Uli




From gordon at panix.com  Thu Sep 15 10:21:41 2011
From: gordon at panix.com (John Gordon)
Date: Thu, 15 Sep 2011 14:21:41 +0000 (UTC)
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
Message-ID: <j4t1lk$h64$1@reader1.panix.com>

In <nemo-15092011085110 at nemo.com> superhappyfuntime <keymint1498 at gmail.com> writes:

> it's not running. here it is: 

> #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.

> #this is defines what means what. you can just read howto.pdf instead 
> of this part.
> here it is: = '\begin{document}'
> it's an article = '\documentclass article'
> it's a book = '\documentclass{book}'
> it's a letter = '\documentclass{letter}'
> it's a report = '\documentclass{report}'
> it's called = '\title{'
> it's over! = '\end{document}'

> #this is where you come in: type what you want below using the terms 
> explained in howto.pdf 

>  print ('it's an article it's called test} here it is: Hello World! 
> it's over!')

You cannot use words like

  it's 

inside a single-quoted string.  Either escape the word like this:

  it\'s

or enclose the entire string in double quotes.

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From matt.pounsett at gmail.com  Thu Sep 15 10:41:29 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Thu, 15 Sep 2011 07:41:29 -0700 (PDT)
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<mailman.1151.1316064930.27778.python-list@python.org>
Message-ID: <45466810-5082-45bd-82d0-ba58a16c4289@t29g2000vby.googlegroups.com>

On Sep 15, 1:35?am, Chris Rebert <c... at rebertia.com> wrote:
> Override __new__() instead:
> http://docs.python.org/reference/datamodel.html#object.__new__

Aha.. thanks!  The reference book I'm working from neglects to mention
__new__, so I'd assumed __init__ was the constructor.  It hadn't
occurred to me that python would separate the functions (I still don't
see exactly why it would be useful to do that, but perhaps insight
will come with time).



From matt.pounsett at gmail.com  Thu Sep 15 10:45:12 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Thu, 15 Sep 2011 07:45:12 -0700 (PDT)
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
	<mailman.1152.1316066053.27778.python-list@python.org>
Message-ID: <028d3cb7-3724-42e8-b347-31eedf9ef149@i5g2000vbw.googlegroups.com>

On Sep 15, 1:54?am, Ryan Kelly <r... at rfk.id.au> wrote:
> The above will do exactly what you want, but it's generally bad style
> unless you have a very specific use-case. ?Is there a particular reason
> you need to "magically" return a subclass, rather than making this
> explicit in the code?
>
> To be friendlier to others reading your code, I would consider using a
> classmethod to create an alternative constructor:

Yeah, I was considering doing this as well, particularly if I couldn't
have made the other work.   The reason I'm not too concerned about
anyone misinterpreting what's going on is that in this case the base
class is actually named for being a constructor, and any rare case
where I want a specific subclass the subclass will be created
directly.

Thanks very much for your help!


From python.list at tim.thechases.com  Thu Sep 15 11:00:09 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 15 Sep 2011 10:00:09 -0500
Subject: Turkic I and re
In-Reply-To: <4E720650.8010101@mrabarnett.plus.com>
References: <4E71F763.2010109@mrabarnett.plus.com>	<4E71FA9F.8090702@alanplum.com>	<CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
	<4E720650.8010101@mrabarnett.plus.com>
Message-ID: <4E7212F9.4040804@tim.thechases.com>

On 09/15/11 09:06, MRAB wrote:
> It's somewhat unlikely that Unicode will become locale-dependent in
> Python because it would cause problems; you don't want:
>
>       "i".upper() == "I"
>
> to be maybe true, maybe false.
>
> An option would be to specify whether it should be locale-dependent.

There have been several times when I've wished that unicode 
strings would grow something like

   .locale_aware_insensitive_cmp(other[,
      locale=locale.getdefaultlocale()]
      )

to return -1/0/1 like cmp(), or in case sort-order is 
nonsensical/arbitrary (such as for things like Mandarin glyphs)

   .insensitive_locale_equal(other,[,
      locale=locale.getdefaultlocale()]
      )

so you could do something like

  if "i".locale_aware_insensitive_cmp("I"):
    not_equal()
  else:
    equal()

or

  if "i".insensitive_locale_equal("I"):
    equal()
  else:
    not_equal()

because while I know that .upper() or .lower() doesn't work in a 
lot of cases, I don't really care about the upper/lower'ness of 
the result, I want to do an insensitive compare (and most of teh 
time it's just for equality, not for sorting).  It's my 
understanding[1] that the same goes for the German where 
"?".upper() is traditionally written as "SS" but "SS".lower() is 
traditionally just "ss" instead of "?".

So if these language-dependent comparisons were relegated to a 
well-tested core method of a unicode string, it may simplify the 
work/issue for you.

-tkc


[1]
http://en.wikipedia.org/wiki/Letter_case#Special_cases







From yasar11732 at gmail.com  Thu Sep 15 11:04:27 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 15 Sep 2011 18:04:27 +0300
Subject: Turkic I and re
In-Reply-To: <4E720650.8010101@mrabarnett.plus.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<4E71FA9F.8090702@alanplum.com>
	<CAJPn68QhTcscQ93d5mjfhw-nHdC8H5bmNYdp=SXj41dH0qjGkA@mail.gmail.com>
	<4E720650.8010101@mrabarnett.plus.com>
Message-ID: <CAFEUn8ZXgYvwMXM1eMM9x+eg4cL18esPDEEAOxrXnuGHyd6DJw@mail.gmail.com>

Hi,

I am a Turkish self-taught python user. Personally, I don't think I am in a
position to discuss a issue in this scale. But in my opinion, I think
pardus* developers should be invited to join to this discussion. As they are
using python heavily on most of their projects** I think they would have
something valueable to say about this subject. Here is the pardus-developers
mailing list : http://liste.pardus.org.tr/mailman/listinfo/pardus-devel

And as for me, I always expect Turkish locale might cause problems, and use
some workarounds if neccessary. For example, If I needed to match lower-case
or upper-case Turkish "i", I would probably go with [i?] with unicode flag.


*) a linux distro developed by  Scientific & Technological Research Council
of Turkey
**) http://developer.pardus.org.tr/projects/index.html



2011/9/15 MRAB <python at mrabarnett.plus.com>

> On 15/09/2011 14:44, John-John Tedro wrote:
>
>> On Thu, Sep 15, 2011 at 1:16 PM, Alan Plum <me at alanplum.com
>> <mailto:me at alanplum.com>> wrote:
>>
>>    On 2011-09-15 15:02, MRAB wrote:
>>
>>        The regex module at http://pypi.python.org/pypi/__**regex<http://pypi.python.org/pypi/__regex>
>>        <http://pypi.python.org/pypi/**regex<http://pypi.python.org/pypi/regex>>
>> currently uses a
>>        compromise, where it matches 'I' with 'i' and also 'I' with '?'
>>        and '?'
>>        with 'i'.
>>
>>        I was wondering if it would be preferable to have a TURKIC flag
>>        instead
>>        ("(?T)" or "(?T:...)" in the pattern).
>>
>>
>>    I think the problem many people ignore when coming up with solutions
>>    like this is that while this behaviour is pretty much unique for
>>    Turkish script, there is no guarantee that Turkish substrings won't
>>    appear in other language strings (or vice versa).
>>
>>    For example, foreign names in Turkish are often given as spelled in
>>    their native (non-Turkish) script variants. Likewise, Turkish names
>>    in other languages are often given as spelled in Turkish.
>>
>>    The Turkish 'I' is a peculiarity that will probably haunt us
>>    programmers until hell freezes over. Unless Turkey abandons its
>>    traditional orthography or people start speaking only a single
>>    language at a time (including names), there's no easy way to deal
>>    with this.
>>
>>    In other words: the only way to make use of your proposed flag is if
>>    you have a fully language-tagged input (e.g. an XML document making
>>    extensive use of xml:lang) and only ever apply regular expressions
>>    to substrings containing one culture at a time.
>>
>>    --
>>    http://mail.python.org/__**mailman/listinfo/python-list<http://mail.python.org/__mailman/listinfo/python-list>
>>    <http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>> >
>>
>>
>> Python does not appear to support special cases mapping, in effect, it
>> is not 100% compliant with the unicode standard.
>>
>> The locale specific 'i' casing in Turkic is mentioned in 5.18 (Case
>> Mappings <http://www.unicode.org/**versions/Unicode6.0.0/ch05.**
>> pdf#G21180 <http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>
>> >)
>>
>> of the unicode standard.
>> http://www.unicode.org/**versions/Unicode6.0.0/ch05.**pdf#G21180<http://www.unicode.org/versions/Unicode6.0.0/ch05.pdf#G21180>
>>
>> AFAIK, the case methods of python strings seems to be built around the
>> assumption that len("string") == len("string".upper()), but some of
>> these casing rules require that the string grow. Like uppercasing of the
>> german sharp s "?" which should be translated to the expanded string "SS".
>> These special cases should be triggered on specific locales, but I have
>> not been able to verify that the Turkic uppercasing of "i" works on
>> either python 2.6, 2.7 or 3.1:
>>
>>   locale.setlocale(locale.LC_**ALL, "tr_TR.utf8") # warning, requires
>> turkish locale on your system.
>>   ord("i".upper()) == 0x130 # is False for me, but should be True
>>
>> I wouldn't be surprised if these issues are translated into the 're'
>> module.
>>
>>  There has been some discussion on the Python-dev list about improving
> Unicode support in Python 3.
>
> It's somewhat unlikely that Unicode will become locale-dependent in
> Python because it would cause problems; you don't want:
>
>    "i".upper() == "I"
>
> to be maybe true, maybe false.
>
> An option would be to specify whether it should be locale-dependent.
>
>
>  The only support appears to be 'L' switch, but it only makes "\w, \W,
>> \b, \B, \s and \S dependent on the current locale".
>>
>
> That flag is for locale-dependent 8-bit encodings. The ASCII (Python
> 3), LOCALE and UNICODE flags are mutually exclusive.
>
>
>  Which probably does not yield to the special rules mentioned above, but
>> I could be wrong. Make sure that your locale is correct and test again.
>>
>> If you are unsuccessful, I don't see a 'Turkic flag' being introduced
>> into re module any time soon, given the following from PEP 20
>> "Special cases aren't special enough to break the rules"
>>
>>  That's why I'm interested in the view of Turkish users. The rest of us
> will probably never have to worry about it! :-)
>
> (There's a report in the Python bug tracker about this issue, which is
> why the regex module has the compromise.)
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>



-- 
http://yasar.serveblog.net/
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From ian.g.kelly at gmail.com  Thu Sep 15 11:17:53 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 15 Sep 2011 09:17:53 -0600
Subject: How does a function know the docstring of its code object?
In-Reply-To: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>
References: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>
Message-ID: <CALwzidkrByBX+nYJ8pLizVjHcLHX+5i+uPJy0BgGomc5GzU3kg@mail.gmail.com>

On Thu, Sep 15, 2011 at 5:10 AM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> Hi all,
>
> You can do:
>
> def foo():
> ? ?"foodoc"
> ? ?pass
>
> function = type(lambda:0)
> foo2 = function(foo.__code__, globals())
> assert foo2.__doc__ == "foodoc"
>
> I am wondering how the function constructor knows that foo.__code__
> has a docstring. ?I can see that
>
> ? ?foo.__code__.co_consts == ('foodoc',)
>
> But I can't find where in foo.__code__ is stored the information that
> the first constant in foo.__code__ is actually a docstring.

>From what I'm seeing, it appears that if there is no docstring, the
first constant will always be None.  So if the first constant is a
string, then it's a docstring.


From Genevieve.Diagorn at open-groupe.com  Thu Sep 15 11:30:11 2011
From: Genevieve.Diagorn at open-groupe.com (=?iso-8859-1?Q?Genevi=E8ve_Diagorn?=)
Date: Thu, 15 Sep 2011 17:30:11 +0200
Subject: From Python on Solaris to Python on LINUX
Message-ID: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>

Hi,

 

I work on projects developed in Python 2.3 on Solaris. The customer asks us
to pass on LINUX in a recent version of Python.

Is it someone has already realized this modification? What are the traps to
be avoided?

Is it a long and difficult phase?

What is the most recent version on LINUX?

Thanks. 

 

Genevi?ve 

 

 

 

 

 

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From arnodel at gmail.com  Thu Sep 15 11:44:46 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Thu, 15 Sep 2011 16:44:46 +0100
Subject: How does a function know the docstring of its code object?
In-Reply-To: <CALwzidkrByBX+nYJ8pLizVjHcLHX+5i+uPJy0BgGomc5GzU3kg@mail.gmail.com>
References: <CAJ6cK1aP3L0o2-Xuj+NzrNFpp-aVgjswk23FtSyPnhcJKqc_bw@mail.gmail.com>
	<CALwzidkrByBX+nYJ8pLizVjHcLHX+5i+uPJy0BgGomc5GzU3kg@mail.gmail.com>
Message-ID: <CAJ6cK1Y_0yNvqyOiN6UTWMF823fCXRLG3XMn00Zf0Q=0=-K7ZA@mail.gmail.com>

On 15 September 2011 16:17, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Thu, Sep 15, 2011 at 5:10 AM, Arnaud Delobelle <arnodel at gmail.com> wrote:
>> Hi all,
>>
>> You can do:
>>
>> def foo():
>> ? ?"foodoc"
>> ? ?pass
>>
>> function = type(lambda:0)
>> foo2 = function(foo.__code__, globals())
>> assert foo2.__doc__ == "foodoc"
>>
>> I am wondering how the function constructor knows that foo.__code__
>> has a docstring. [...]
>
> From what I'm seeing, it appears that if there is no docstring, the
> first constant will always be None. ?So if the first constant is a
> string, then it's a docstring.
>

Yes it seems to be the case.  Even if None is not used in the
function, it appears in co_consts.  Good thinking!

Thanks,

-- 
Arnaud


From fulvio.valente at strath.ac.uk  Thu Sep 15 11:55:13 2011
From: fulvio.valente at strath.ac.uk (Fulvio Valente)
Date: Thu, 15 Sep 2011 16:55:13 +0100
Subject: Request for research feedback
Message-ID: <4296A2DFD9C6B4499A22AA3E585D715902D6AF01B7F1@E2K7-MS3.ds.strath.ac.uk>

Hi, I am a research intern at the University of Strathclyde who has been doing a summer research internship. I hope that this is not an inappropriate place to ask, but I am looking for participants willing to use and evaluate an application that was written as part of this internship. If you choose to participate, this should only take no more than an hour or two of your time at the very most, unless you wish to not use the analysis files provided.

My project is to experiment with ways of inferring and displaying socio-technical information about a software project from a version control repository by creating a prototype application. The application infers authorship information in the form of "closeness scores" between authors and the files they have worked on by traversing the history of a Mercurial repository. This is then displayed as a map of socio-technical dependencies between files and the authors that worked on them and between authors and the files they have worked on, which should allow for easy visual comparisons of closeness.

Some potential applications and use cases I can envision in the program's current form include discovering who the key figures are (i.e. who to talk to about a problem) or what the bus factor (how many people need to be "hit by a bus" before a project is in trouble because there's nobody left who understands it) is for a project or a subsystem within it. Perhaps a little more depressingly, this also maybe be used to highlight potential cases of poor productivity to be investigated.

The program itself, Jimmy (for lack of a better name), has a binary distribution which can be found at http://geeksoc.org/~fvalente/jimmy/jimmy_r1.zip and only requires Java 7 and Mercurial (other libraries are included), getting you started quickly. The source is available at https://bitbucket.org/fvalente/jimmy and if you wish to build it yourself, it depends on Guava r09 and JUNG 2.0.1 (api, algorithms, graph-impl, visualization) which itself depends on Apache Commons collections-generic 4.0.1.

To perform a basic analysis of a project, you can open a directory that's a Mercurial repository and it will just look at the list of commits and the files that changed, adding 1 to a score each time an author touches a file, which should only take a minute or two, even for large projects. If you have more time, you can do the more expensive diff stats analysis which compares the size of each diff with the average diff size of the project, excluding empty diffs and binary changes. Unfortunately, the diff stats analysis is very slow due to retrieving each diff requiring the spawning of a hg subprocess (for reference, my 4 year old quad-core machine can do only ~10,000 commits per hour). I don't have a progress UI yet, but progress status is sent to stdout when doing a diff stats analysis. Once analysis is complete, you can save the results to review later by using the open analysis results option.

To navigate the results you can switch to viewing a particular file or author of interest from the file and author lists on the left. For files, this will display that file as a node in the centre with the authors that have been involved with it as orbiting nodes, with the connecting lines' length, thickness and colour shortening, thickening and approaching red respectively as the closeness score between that author and the file increases. For authors, it is the same except the files they have worked on will be the orbiting nodes. You can also directly navigate to having a display based on an orbiting node by clicking it in the display rather than searching through the file or author lists. The display can be zoomed by using the scroll wheel and can be translated with the scroll bars or by dragging on an area not occupied by a node.

What I would like is for you to please run Jimmy on one or more Mercurial repositories of your choice and to give some feedback on it. Some questions I'd particularly like answered are:

* Do the closeness scores it produces match with your perception of the relationships between people and code in the project? (e.g. if you're looking at a particular file and some authors involved in it are shown as closer than others, is this the result you would have expected from a perfect version of Jimmy?)
* Does the visualisation of the scores substantially improve your ability to draw conclusions from the data compared to just reading a saved analysis (which is just plaintext)?
* If, hypothetically, you had no prior knowledge about the project, would using it help you to discover the key figures (e.g. maintainer, BDFL) behind the project or any of its subsystems? (Alternatively, do such people correctly show up as having touched a wider variety of files and with closer relations to them than other people?)
* If you were a manager would you be able to use it to discover potential productivity issues that you would then investigate further?

To help save you time from having to do a full analysis of a project, I have supplied analysis files from 3 open-source projects which you can open with the "Open analysis results" option:

* cpython: http://geeksoc.org/~fvalente/jimmy/cpython.txt
* libSDL: http://geeksoc.org/~fvalente/jimmy/libsdl.txt
* Go: http://geeksoc.org/~fvalente/jimmy/golang.txt

Some general suggestions on whether and why the current ways of inferring closeness scores and visualising that data are flawed would also be greatly appreciated, as well as potential avenues to explore for improving them. Suggestions I've already received include:

* Being able to collapse files into folders or subsystem groups to make larger projects more navigable, perhaps with autoexpansion when zooming the display. In its current form, Jimmy produces disappointing/funny results when you want to see a diagram for, say, a large project's maintainer.
* Being able to mine data from a subset of the repository (time range, revision range, include/exclude files/directories, etc.)
* Reducing the closeness score contributions of multiple commits made in quick succession, or another method of mitigating the bias in favour of fine-grained committers
* Reducing the closeness score contributions of older commits
* Interfacing with Mercurial via the recently introduced command server API, which should hopefully make performance non-abysmal
* Support for more version control systems. Git would top this list
* Perhaps the ability to see a timeline for the project and how closeness changes over time

Responses can be made privately to me, if you wish. For the purposes of my report, I will also anonymise all responses received in line with ethical best practices. Thank you for reading.

From dmitrey15 at gmail.com  Thu Sep 15 12:24:58 2011
From: dmitrey15 at gmail.com (dmitrey)
Date: Thu, 15 Sep 2011 09:24:58 -0700 (PDT)
Subject: [ANN} OpenOpt, FuncDesigner, DerApproximator,
	SpaceFuncs release 0.36 Options
Message-ID: <ba4e2c57-b951-4606-b978-82788f7ac4c5@z7g2000vbp.googlegroups.com>

Hi all,
new release of our free scientific soft (OpenOpt, FuncDesigner,
DerApproximator,
SpaceFuncs) v. 0.36 is out:

OpenOpt:

    Now solver interalg can handle all types of constraints and
integration problems
    Some minor improvements and code cleanup

FuncDesigner:

    Interval analysis now can involve min, max and 1-d monotone
splines R -> R of 1st and 3rd order
    Some bugfixes and improvements

SpaceFuncs:

    Some minor changes

DerApproximator:

    Some improvements for obtaining derivatives in points from R^n
where left or right derivative for a variable is absent, especially
for stencil > 1

See http://openopt.org for more details.

Regards, D.


From phihag at phihag.de  Thu Sep 15 12:26:04 2011
From: phihag at phihag.de (Philipp Hagemeister)
Date: Thu, 15 Sep 2011 18:26:04 +0200
Subject: From Python on Solaris to Python on LINUX
In-Reply-To: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
References: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
Message-ID: <4E72271C.1020502@phihag.de>

> What are the traps to be avoided?

Assuming you're not using any OS features (scan the code for "/dev" and
"/proc"), the transition from Solaris to Linux will be seamless.

Your main problem will be the transition from the archaic Python 2.3 to
a modern one. Luckily, all 2.x Pythons should be backwards-compatible.

In summary, your application should work just fine (although being
written in 2.3, it's probably not as maintainable as a modern
application would).

> What is the most recent version on LINUX?
There are multiple Linux distributions which can differ quite a lot.
debian, Ubuntu, and CentOS are popular ones. As you can see on
http://www.debian.org/CD/ , the current debian version is 6.0. As you
can't see at the moment on http://kernel.org/ , the current Linux kernel
version is 3.0 (although most distribution will want to test the kernel
and therefore include a slightly older one).

-- Philipp

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From miki.tebeka at gmail.com  Thu Sep 15 12:37:44 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 15 Sep 2011 09:37:44 -0700 (PDT)
Subject: cause __init__ to return a different class?
In-Reply-To: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
Message-ID: <c91b301a-7a1d-49d7-8d76-879b8044ea8a@glegroupsg2000goo.googlegroups.com>

I'd go for a factory function (http://en.wikipedia.org/wiki/Factory_method_pattern):

def create(foo):
    return Child(foo) if foo else Parent()


From neuroniru at gmail.com  Thu Sep 15 12:40:01 2011
From: neuroniru at gmail.com (neeru K)
Date: Thu, 15 Sep 2011 22:10:01 +0530
Subject: help regarding extracting a smaller list from larger one
Message-ID: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>

Dear Python Users,
I am trying to write a code for visualization (raster plots and peri-event
time histogram) of time series electrophysiological data using numpy, scipy
and matlplotlib in python. I am importing the data into list using loadtext
command.
I was curious if anyone is aware of a function in numpy that can *extract a
smaller list containing numbers from a larger list* given the upper and
lower limit of the values between which the smaller list lies.
Thank you in advance.
Sincerely,
niranjan

-- 
Niranjan Kambi
Senior Research Fellow,
Neeraj Lab,
National Brain Research Centre,
Manesar, Gurgaon-122050
Haryana, INDIA
Ph:+919818654846
website:-
http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html
email:- neuro.niru at nbrc.res.in, neuroniru at gmail.com
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From stef.mientki at gmail.com  Thu Sep 15 12:57:24 2011
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 15 Sep 2011 18:57:24 +0200
Subject: how to make a nested list
Message-ID: <4E722E74.7030908@gmail.com>

hello,

I need a nested list, like this

 >>> A= [ [None,None], [None,None], [None, None] ]
 >>> A[2][0] =77
 >>> A
[[None, None], [None, None], [77, None]]


Because the list is much larger, I need a shortcut (ok I can use a for loop)
So I tried
 >>> B = 3 * [ [ None, None ]]
 >>> B[2][0] = 77
 >>> B
[[77, None], [77, None], [77, None]]

which doesn't work as expected.

any suggestions ?

thanks,
Stef


From ramit.prasad at jpmorgan.com  Thu Sep 15 13:09:07 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 15 Sep 2011 13:09:07 -0400
Subject: how to make a nested list
In-Reply-To: <4E722E74.7030908@gmail.com>
References: <4E722E74.7030908@gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16CEFACA@EMARC112VS01.exchad.jpmchase.net>

>>> B = 3 * [ [ None, None ]]
That makes a list of the exact same list object: [ a, a, a ] where a = [ None, None ]. 
Instead I would do something like (untested python2.x):
B = [ [ None, None ] for x in xrange(3) ]

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ppearson at nowhere.invalid  Thu Sep 15 13:17:42 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 15 Sep 2011 17:17:42 GMT
Subject: how to make a nested list
References: <mailman.1175.1316106277.27778.python-list@python.org>
Message-ID: <9deq9lFpo7U1@mid.individual.net>

On Thu, 15 Sep 2011 18:57:24 +0200, Stef Mientki wrote:
[snip]
> Because the list is much larger, I need a shortcut (ok I can use a for loop)
> So I tried
> >>> B = 3 * [ [ None, None ]]
> >>> B[2][0] = 77
> >>> B
> [[77, None], [77, None], [77, None]]
>
> which doesn't work as expected.
>
> any suggestions ?

>>> b = [[None, None] for i in range(3)]
>>> b[2][0] = 77
>>> b
[[None, None], [None, None], [77, None]]

If you don't understand why the other approach resulted in
[[77, None], [77, None], [77, None]], feel free to ask.  It's
a mistake that I think everybody makes at least once.

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


From gherron at digipen.edu  Thu Sep 15 13:24:15 2011
From: gherron at digipen.edu (Gary Herron)
Date: Thu, 15 Sep 2011 10:24:15 -0700
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
Message-ID: <4E7234BF.5030101@digipen.edu>

On 09/15/2011 09:40 AM, neeru K wrote:
> Dear Python Users,
> I am trying to write a code for visualization (raster plots and 
> peri-event time histogram) of time series electrophysiological data 
> using numpy, scipy and matlplotlib in python. I am importing the data 
> into list using loadtext command.
> I was curious if anyone is aware of a function in numpy that can 
> *extract a smaller list containing numbers from a larger list* given 
> the upper and lower limit of the values between which the smaller list 
> lies.
> Thank you in advance.
> Sincerely,
> niranjan
>
> -- 
> Niranjan Kambi
> Senior Research Fellow,
> Neeraj Lab,
> National Brain Research Centre,
> Manesar, Gurgaon-122050
> Haryana, INDIA
> Ph:+919818654846
> website:- 
> http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html
> email:- neuro.niru at nbrc.res.in <mailto:neuro.niru at nbrc.res.in>, 
> neuroniru at gmail.com <mailto:neuroniru at gmail.com>
>
Do mean to extract a sub-list from a list based on lower and upper 
indexes into the list?  Python has a standard notation for indicating 
sub-lists, and numpy implements them:

 >>> a = numpy.array(range(10))
 >>> a
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
 >>> a[3:6]
array([3, 4, 5])

If you mean something else, please be more specific, and we'll try again.

Gary Herron


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From howe.steven at gmail.com  Thu Sep 15 13:27:53 2011
From: howe.steven at gmail.com (GrayShark)
Date: Thu, 15 Sep 2011 12:27:53 -0500
Subject: From Python on Solaris to Python on LINUX
References: <mailman.1174.1316105102.27778.python-list@python.org>
Message-ID: <XcednakTT8gEqO_TnZ2dnUVZ_rCdnZ2d@iwvisp.com>

I think that was more of a version question the Kernel questin

1) you can install any and all versions python on a linux computer.
You just need you app to select the correct path, correct python 
interpret. Likely there many be some some drivers in /dev that are
not the same as in Solaris. But that shouldn't daunt you. 
So start by installing python2.3, then test and fix version by version
through python2.7. python3.0 might be a pretty be rewrite.

2) Try to pick a version of linux supported locally; likely SuSE, even 
though Novell/Attachmate owns it. SuSE seems popular in Europe.


On Thu, 15 Sep 2011 18:26:04 +0200, Philipp Hagemeister wrote:

>> What are the traps to be avoided?
> 
> Assuming you're not using any OS features (scan the code for "/dev" and
> "/proc"), the transition from Solaris to Linux will be seamless.
> 
> Your main problem will be the transition from the archaic Python 2.3 to
> a modern one. Luckily, all 2.x Pythons should be backwards-compatible.
> 
> In summary, your application should work just fine (although being
> written in 2.3, it's probably not as maintainable as a modern
> application would).
> 
>> What is the most recent version on LINUX?
> There are multiple Linux distributions which can differ quite a lot.
> debian, Ubuntu, and CentOS are popular ones. As you can see on
> http://www.debian.org/CD/ , the current debian version is 6.0. As you
> can't see at the moment on http://kernel.org/ , the current Linux kernel
> version is 3.0 (although most distribution will want to test the kernel
> and therefore include a slightly older one).
> 
> -- Philipp



From gherron at digipen.edu  Thu Sep 15 13:28:23 2011
From: gherron at digipen.edu (Gary Herron)
Date: Thu, 15 Sep 2011 10:28:23 -0700
Subject: how to make a nested list
In-Reply-To: <4E722E74.7030908@gmail.com>
References: <4E722E74.7030908@gmail.com>
Message-ID: <4E7235B7.4030207@digipen.edu>

On 09/15/2011 09:57 AM, Stef Mientki wrote:
> hello,
>
> I need a nested list, like this
>
> >>> A= [ [None,None], [None,None], [None, None] ]
> >>> A[2][0] =77
> >>> A
> [[None, None], [None, None], [77, None]]
>
>
> Because the list is much larger, I need a shortcut (ok I can use a for 
> loop)
> So I tried
> >>> B = 3 * [ [ None, None ]]
> >>> B[2][0] = 77
> >>> B
> [[77, None], [77, None], [77, None]]
>
> which doesn't work as expected.
>
> any suggestions ?
>
> thanks,
> Stef

A for loop to fill in the array would work, but list comprehension 
(which is really just an internal loop for filling an array) is probably 
more efficient, certainly less code, and arguably more Pythonic.

A = [ [None,None]  for i in range(1000) ]

Gary Herron


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From tim at akwebsoft.com  Thu Sep 15 13:38:16 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Thu, 15 Sep 2011 09:38:16 -0800
Subject: Reconciling os.path.getmtime vs ftp.sendcmd('MDTM filename')
In-Reply-To: <20110915020242.GL4331@johnsons-web.com>
References: <20110914195044.GK4331@johnsons-web.com>
	<CAMZYqRSHwwpf2mpNqEJT6W+RjhRqQcS4eu+9k_SpPc0QNf7+Rg@mail.gmail.com>
	<20110915020242.GL4331@johnsons-web.com>
Message-ID: <20110915173816.GM4331@johnsons-web.com>

* Tim Johnson <tim at akwebsoft.com> [110914 18:18]:
> * Chris Rebert <clp2 at rebertia.com> [110914 16:46]:
> > On Wed, Sep 14, 2011 at 12:50 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> > > I have written a class that uses ftplib.FTP as the parent.
> > > I need to reconcile the modified time of a workstation file with
> > > that same filename on a remote server.
> > > Let's say we have a file called '400.shtml'. I get the mtime on
> > > my workstation by
> > >>> os.path.getmtime('400.shtml')
> > > 1311648420.0
> > 
> > http://docs.python.org/library/os.path.html#os.path.getmtime
> > Your sample seems to be a typical Unix timestamp:
>  Yup. Needs to be converted to a timedate stamp, methinks.
> > http://en.wikipedia.org/wiki/Unix_time
>   I'll look at that tomorrow. Late here.  
> > > And I use
> > >>> ftp.sendcmd('MDTM 400.shtml') ## for the remote server
> > > '213 20110726004703'
>  
> > RFC 3659 - Extensions to FTP
> > Sec 3. File Modification Time (MDTM)
> > http://tools.ietf.org/html/rfc3659#section-3
> > 
> > (Note: Code 213 = File status response)
>   and '213 20110726004703'[4:] should give me
>   the string representation of the timedate stamp on the
>   remote file.
  FYI:  datetime.datetime.fromtimestamp(mod_time)
  Is probably what I was looking for. However, for my
  purposes - I'm going to take another approach.
  Every uploaded file is defined in an object stored on my
  workstationr:
  I will store the MDTM string after upload and then on the next
  upload, compare the stored string with the return value
  from ftp.sendcmd('MDTM ' + filename)
  Thanks for the input.
-- 
Tim 
tim at johnsons-web dot com or akwebsoft dot com
http://www.akwebsoft.com


From arnodel at gmail.com  Thu Sep 15 13:39:34 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Thu, 15 Sep 2011 18:39:34 +0100
Subject: cause __init__ to return a different class?
In-Reply-To: <45466810-5082-45bd-82d0-ba58a16c4289@t29g2000vby.googlegroups.com>
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<mailman.1151.1316064930.27778.python-list@python.org>
	<45466810-5082-45bd-82d0-ba58a16c4289@t29g2000vby.googlegroups.com>
Message-ID: <CAJ6cK1ZzuBvW7YrdBOJEo3d8wvck1FnArkzrUCkQDAAt+WgMOA@mail.gmail.com>

On 15 September 2011 15:41, Matthew Pounsett <matt.pounsett at gmail.com> wrote:
> On Sep 15, 1:35?am, Chris Rebert <c... at rebertia.com> wrote:
>> Override __new__() instead:
>> http://docs.python.org/reference/datamodel.html#object.__new__
>
> Aha.. thanks! ?The reference book I'm working from neglects to mention
> __new__, so I'd assumed __init__ was the constructor. ?It hadn't
> occurred to me that python would separate the functions (I still don't
> see exactly why it would be useful to do that, but perhaps insight
> will come with time).

If you're interested in the reason, I suggest you read Guido's essay
on "new style classes" which were introduced in Python 2.2 (and are
now a good 10 years old I think):

    http://www.python.org/download/releases/2.2.3/descrintro

-- 
Arnaud


From ladasky at my-deja.com  Thu Sep 15 14:43:33 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 11:43:33 -0700 (PDT)
Subject: how to make a nested list
References: <mailman.1175.1316106277.27778.python-list@python.org>
Message-ID: <da67a480-1367-469f-ac0f-366220e34329@n11g2000yqh.googlegroups.com>

Stef,

Are your bottom-level lists always of length 2?  If so, then you could
use an array, instead of a list of lists.

Python ships with a module called array, but it doesn't allow you to
put non-numeric types into arrays, and it looks like you want the
NoneType.  I use the popular numpy module, which does allow non-
numeric types.

You might also like the slice notation that numpy uses for referencing
items in the array.  The indices go inside a single set of square
brackets, and are separated by commas.

>>> from numpy import empty
>>> B = empty((3,2), object)
>>> B
array([[None, None],
       [None, None],
       [None, None]], dtype=object)
>>> B[2,0] = 77
>>> B
array([[None, None],
       [None, None],
       [77, None]], dtype=object)


From tjreedy at udel.edu  Thu Sep 15 14:54:57 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 15 Sep 2011 14:54:57 -0400
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <1316063960.26516.140258141338017@webmail.messagingengine.com>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
Message-ID: <j4thm7$ikt$1@dough.gmane.org>

On 9/15/2011 1:19 AM, python at bdurham.com wrote:
> Is there a way to cancel or timeout a long running regular expression?
> I have a program that accepts regular expressions from users and I'm
> concerned about how to handle worst case regular expressions that seem
> to run forever. Ideally I'm looking for a way to evaluate a regular
> expression and timeout after a specified time period if the regular
> expression hasn't completed yet. Or a way for a user to cancel a long
> running regular expression.

This is a general problem when evaluating *any* expression from the 
outside. [0]*10000*10000 will eat space as well as time. At least, as 
far as I know, an re cannot cause a disk reformat ;-).

There have been previous discussions on this generally topic.

> I was thinking there might be a technique I could use to evaluate
> regular expressions in a thread or another process launched via
> multiprocessing module and then kill the thread/process after a
> specified timeout period.

Only solution I remember ever seen posted. I wonder if there are any 
heuristics for detecting exponential time re's.

 > My concern about the multiprocessing module
> technique is that launching a process for every regex evaluation sounds
> pretty inefficient. And I don't think the threading module supports the
> ability to kill threads from outside a thread itself.

-- 
Terry Jan Reedy



From neuroniru at gmail.com  Thu Sep 15 14:55:08 2011
From: neuroniru at gmail.com (neeru K)
Date: Fri, 16 Sep 2011 00:25:08 +0530
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <4E7234BF.5030101@digipen.edu>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
	<4E7234BF.5030101@digipen.edu>
Message-ID: <CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>

Dear Gary,
thank you for the reply.
I will be more specific and take the same example that you have given and
tell you what is my problem -
array([0.0, 1.3, 2.45, 3.87, 4.54, 5.11, 6.90, 7.78, 8.23, 9.01])
from this array I want to a sub-list with lower and upper indexes that are
not present in the above array for example - sub-list[3, 8]
Is there a function for this?
thank you
niranjan


On Thu, Sep 15, 2011 at 10:54 PM, Gary Herron <gherron at digipen.edu> wrote:

> On 09/15/2011 09:40 AM, neeru K wrote:
>
>> Dear Python Users,
>> I am trying to write a code for visualization (raster plots and peri-event
>> time histogram) of time series electrophysiological data using numpy, scipy
>> and matlplotlib in python. I am importing the data into list using loadtext
>> command.
>> I was curious if anyone is aware of a function in numpy that can *extract
>> a smaller list containing numbers from a larger list* given the upper and
>> lower limit of the values between which the smaller list lies.
>> Thank you in advance.
>> Sincerely,
>> niranjan
>>
>> --
>> Niranjan Kambi
>> Senior Research Fellow,
>> Neeraj Lab,
>> National Brain Research Centre,
>> Manesar, Gurgaon-122050
>> Haryana, INDIA
>> Ph:+919818654846
>> website:- http://www.nbrc.ac.in/faculty/**neeraj/Lab_webpage/Niranjan_**
>> Kambi.html<http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html>
>> email:- neuro.niru at nbrc.res.in <mailto:neuro.niru at nbrc.res.in**>,
>> neuroniru at gmail.com <mailto:neuroniru at gmail.com>
>>
>>  Do mean to extract a sub-list from a list based on lower and upper
> indexes into the list?  Python has a standard notation for indicating
> sub-lists, and numpy implements them:
>
> >>> a = numpy.array(range(10))
> >>> a
> array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
> >>> a[3:6]
> array([3, 4, 5])
>
> If you mean something else, please be more specific, and we'll try again.
>
> Gary Herron
>
>
> --
> Gary Herron, PhD.
> Department of Computer Science
> DigiPen Institute of Technology
> (425) 895-4418
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
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From wm at localhost.localdomain  Thu Sep 15 15:14:11 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Thu, 15 Sep 2011 21:14:11 +0200
Subject: Request for research feedback
References: <mailman.1172.1316103671.27778.python-list@python.org>
Message-ID: <1oxwvsczcdfj4$.dlg@localhost.localdomain>

On Thu, 15 Sep 2011 16:55:13 +0100, Fulvio Valente wrote:

> Hi, I am a research intern at the University of Strathclyde
> who has been doing a summer research internship.

I don't want to be rude, but please: could you rather first research
how to use a newsreader before you use it?
These long lines (a few times the limit of 78 characters per line)
make your post unreadable.

Thanks,
Waldek


From nagle at animats.com  Thu Sep 15 15:27:58 2011
From: nagle at animats.com (John Nagle)
Date: Thu, 15 Sep 2011 12:27:58 -0700
Subject: PC locks up with list operations
In-Reply-To: <mailman.599.1314794452.27778.python-list@python.org>
References: <4e5e2a0c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.599.1314794452.27778.python-list@python.org>
Message-ID: <4e7251c1$0$1673$742ec2ed@news.sonic.net>

On 8/31/2011 5:40 AM, Chris Withers wrote:
> On 31/08/2011 13:33, Steven D'Aprano wrote:
>> I am using Linux desktops; both incidents were with Python 2.5. Do newer
>> versions of Python respond to this sort of situation more gracefully?
>
> Ironically, Windows does better here and dumps you out with a
> MemoryError before slowly recovering.
>
> Linux seems to fair badly when programs use more memory than physically
> available.

    Linux virtual memory has some known design problems.  For example,
you can crash many Linux systems with a program which opens large
files and accesses them randomly, combined with another program which
is spawning processes that need a fair amount of memory.  The disk
caching system tries to use all unused memory, and when process
startup is consuming pages, it's possible to get into a situation
where a page is needed, the task requesting it can't block, and
a lock preventing freeing a file cache page is set.

    Arguably, paging to disk is obsolete. RAM is too cheap and
disk is too slow.

					John Nagle


From ramit.prasad at jpmorgan.com  Thu Sep 15 16:11:13 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 15 Sep 2011 16:11:13 -0400
Subject: Request for research feedback
In-Reply-To: <1oxwvsczcdfj4$.dlg@localhost.localdomain>
References: <mailman.1172.1316103671.27778.python-list@python.org>
	<1oxwvsczcdfj4$.dlg@localhost.localdomain>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16CEFF05@EMARC112VS01.exchad.jpmchase.net>

I don't want to be rude but...

Rude:
>I don't want to be rude, but please: could you rather first research
>how to use a newsreader before you use it?
>These long lines (a few times the limit of 78 characters per line)
>make your post unreadable.

Not rude:
>These long lines (a few times the limit of 78 characters per line)
>make your post unreadable.

Sincerely,
Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From fulvio.valente at strath.ac.uk  Thu Sep 15 16:19:46 2011
From: fulvio.valente at strath.ac.uk (Fulvio Valente)
Date: Thu, 15 Sep 2011 21:19:46 +0100
Subject: Request for research feedback
In-Reply-To: <1oxwvsczcdfj4$.dlg@localhost.localdomain>
References: <mailman.1172.1316103671.27778.python-list@python.org>
	<1oxwvsczcdfj4$.dlg@localhost.localdomain>
Message-ID: <4E725DE2.7050704@strath.ac.uk>

Whoops, I thought the rather iffy Exchange web client at my institution 
would've wrapped outgoing messages automatically. I'm now using a proper 
client for that account which should prevent such issues in the future. 
Thanks for the heads up.

For anyone who couldn't stand to read the original message, a fixed 
version is at http://geeksoc.org/~fvalente/jimmy/request.txt (figured 
it'd be rude to repost it directly in this message).

On 15/09/2011 20:14, Waldek M. wrote:
> On Thu, 15 Sep 2011 16:55:13 +0100, Fulvio Valente wrote:
>
>> Hi, I am a research intern at the University of Strathclyde
>> who has been doing a summer research internship.
>
> I don't want to be rude, but please: could you rather first research
> how to use a newsreader before you use it?
> These long lines (a few times the limit of 78 characters per line)
> make your post unreadable.
>
> Thanks,
> Waldek

-- 
Regards,
- Fulvio


From ladasky at my-deja.com  Thu Sep 15 16:52:45 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 13:52:45 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
Message-ID: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>

Suppose that I have a multi-core computer with N CPU's, and I create a
multiprocessing.Pool in Python 2.6 with N-1 Processes.

(My rationale for choosing N-1 Processes was discussed here:
http://groups.google.com/group/comp.lang.python/browse_frm/thread/65ba3ccd4be8228c)

Then I use Pool.map_async() to break up a long-running task T1 into M
chunks, where M > 2N.

Suppose that I have a second, parallelizable, long-running task T2
that I want to address in REAL TIME when the need arises.  Using Pool,
is there a way for me to insert the chunks of T2 at the HEAD of the
task queue, instead of at its TAIL?

I've been snooping around inside Pool, and I would guess that what I
want to do is to manipulate Pool._inqueue, which is a
multiprocessing.queues.SimpleQueue object.  I haven't found any
documentation for SimpleQueue.  It appears to have only the most
rudimentary of public methods -- put, get, and empty.

Reading further, I can see that multiprocessing.Queue (not the same as
SimpleQueue) has put_nowait(), which looks like what I need.  Assuming
that I had access to put_nowait(), then I would need an option in
map_async() which would invoke put_nowait() rather than just plain
put().

Does anyone know of an efficient way to accomplish this?  I'm thinking
that a subclass of Pool which replaces the SimpleQueue with a full-
fledged Queue, and which overrides map_async() allowing for a no-wait
task, would be very useful... but maybe I'm re-inventing the wheel.
Thanks for your advice!


From ladasky at my-deja.com  Thu Sep 15 17:49:53 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 14:49:53 -0700 (PDT)
Subject: Accessing matplotlib-users discussion group?
References: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>
Message-ID: <d20cc76c-5ba6-4311-8459-0327134c8c49@u10g2000yqk.googlegroups.com>

Hate to bump this, but... I found Sourceforge's IRC, and tried to ask
for help there, and it doesn't look like I can get any help until
business hours tomorrow.  Anyone?


From vlastimil.brom at gmail.com  Thu Sep 15 18:02:10 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 16 Sep 2011 00:02:10 +0200
Subject: how to make a nested list
In-Reply-To: <4E722E74.7030908@gmail.com>
References: <4E722E74.7030908@gmail.com>
Message-ID: <CAHzaPENKcwyDnyDfMZppEiPyG6s-b3oyziduswD4b7waAjQdbQ@mail.gmail.com>

2011/9/15 Stef Mientki <stef.mientki at gmail.com>:
> hello,
>
> I need a nested list, like this
>
>>>> A= [ [None,None], [None,None], [None, None] ]
>>>> A[2][0] =77
>>>> A
> [[None, None], [None, None], [77, None]]
> ...
>
> thanks,
> Stef
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Besides the above sugestions to correct the nested list approach,
if you need to set and access the data at the given "coordinates" you
could also use a nested defaultdict, which doesn't need to be
pre-filled before setting, e.g.:

>>> from collections import defaultdict as dd
>>> def dd_dd():
...     return dd(dd)
...
>>> dd_matrix = dd(dd_dd)
>>>
>>> dd_matrix[2][0] = 77
>>> dd_matrix[2][0]
77
>>> dd_matrix
defaultdict(<function dd_dd at 0x04E5B8B0>, {2: defaultdict(<type
'collections.defaultdict'>, {0: 77})})
>>>

However, the nested list are concise enough, I guess.

Regards,
   vbr


From rosuav at gmail.com  Thu Sep 15 18:14:00 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:14:00 +1000
Subject: multiprocessing.Pool, its queue, and pre-emption
In-Reply-To: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
Message-ID: <CAPTjJmoQ1gAmaQkBCYkyAAwge7VEZSztwrSys5+aKWCEeKJA5Q@mail.gmail.com>

On Fri, Sep 16, 2011 at 6:52 AM, John Ladasky <ladasky at my-deja.com> wrote:
> Suppose that I have a second, parallelizable, long-running task T2
> that I want to address in REAL TIME when the need arises. ?Using Pool,
> is there a way for me to insert the chunks of T2 at the HEAD of the
> task queue, instead of at its TAIL?
>

That's a self-contradiction there. Even if you insert a task into the
head of the queue, it won't be addressed in real time; the only way to
do that would be to have a dedicated process, always ready to handle
the real-time events, or else some kind of interrupt system.

But if you just want them handled when there's a worker available,
what you're after is a priority queue system. I don't know if one
exists in Python already or not, but if not, it'd be a worthwhile
addition.

ChrisA


From rosuav at gmail.com  Thu Sep 15 18:22:42 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:22:42 +1000
Subject: how to make a nested list
In-Reply-To: <CAHzaPENKcwyDnyDfMZppEiPyG6s-b3oyziduswD4b7waAjQdbQ@mail.gmail.com>
References: <4E722E74.7030908@gmail.com>
	<CAHzaPENKcwyDnyDfMZppEiPyG6s-b3oyziduswD4b7waAjQdbQ@mail.gmail.com>
Message-ID: <CAPTjJmrTHe_jBw19O13bx2Xa__ELkZDX=dpWdmezcV8i39XrAw@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:02 AM, Vlastimil Brom
<vlastimil.brom at gmail.com> wrote:
> Besides the above sugestions to correct the nested list approach,
> if you need to set and access the data at the given "coordinates" you
> could also use a nested defaultdict...

The defaultdict is efficient for a sparse matrix, but I suspect that
it'd be rather worse if you use all the elements.

ChrisA


From gherron at digipen.edu  Thu Sep 15 18:25:18 2011
From: gherron at digipen.edu (Gary Herron)
Date: Thu, 15 Sep 2011 15:25:18 -0700
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>	<4E7234BF.5030101@digipen.edu>
	<CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>
Message-ID: <4E727B4E.4000400@digipen.edu>

On 09/15/2011 11:55 AM, neeru K wrote:
> Dear Gary,
> thank you for the reply.
> I will be more specific and take the same example that you have given 
> and tell you what is my problem -
> array([0.0, 1.3, 2.45, 3.87, 4.54, 5.11, 6.90, 7.78, 8.23, 9.01])
> from this array I want to a sub-list with lower and upper indexes that 
> are not present in the above array for example - sub-list[3, 8]
> Is there a function for this?
> thank you
> niranjan

You say "index", but I think that is not what you mean.  An index is in 
integer referring to an element's position in the array.   The "value" 
at an index is what I believe you are referring to.

Nevertheless, I think list comprehension is what you want:
     [ x  for x in A  if 3.0 <= x <= 8.0 ]
will extract all the values between 3 and 8 from the array A and create 
a new list containing them.

If you want the new list to be a numpy array then
     numpy.array([ x  for x in A  if 3.0 <= x <= 8.0 ])



>
>
> On Thu, Sep 15, 2011 at 10:54 PM, Gary Herron <gherron at digipen.edu 
> <mailto:gherron at digipen.edu>> wrote:
>
>     On 09/15/2011 09:40 AM, neeru K wrote:
>
>         Dear Python Users,
>         I am trying to write a code for visualization (raster plots
>         and peri-event time histogram) of time series
>         electrophysiological data using numpy, scipy and matlplotlib
>         in python. I am importing the data into list using loadtext
>         command.
>         I was curious if anyone is aware of a function in numpy that
>         can *extract a smaller list containing numbers from a larger
>         list* given the upper and lower limit of the values between
>         which the smaller list lies.
>         Thank you in advance.
>         Sincerely,
>         niranjan
>
>         -- 
>         Niranjan Kambi
>         Senior Research Fellow,
>         Neeraj Lab,
>         National Brain Research Centre,
>         Manesar, Gurgaon-122050
>         Haryana, INDIA
>         Ph:+919818654846 <tel:%2B919818654846>
>         website:-
>         http://www.nbrc.ac.in/faculty/neeraj/Lab_webpage/Niranjan_Kambi.html
>         email:- neuro.niru at nbrc.res.in <mailto:neuro.niru at nbrc.res.in>
>         <mailto:neuro.niru at nbrc.res.in
>         <mailto:neuro.niru at nbrc.res.in>>, neuroniru at gmail.com
>         <mailto:neuroniru at gmail.com> <mailto:neuroniru at gmail.com
>         <mailto:neuroniru at gmail.com>>
>
>     Do mean to extract a sub-list from a list based on lower and upper
>     indexes into the list?  Python has a standard notation for
>     indicating sub-lists, and numpy implements them:
>
>     >>> a = numpy.array(range(10))
>     >>> a
>     array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
>     >>> a[3:6]
>     array([3, 4, 5])
>
>     If you mean something else, please be more specific, and we'll try
>     again.
>
>     Gary Herron
>
>
>     -- 
>     Gary Herron, PhD.
>     Department of Computer Science
>     DigiPen Institute of Technology
>     (425) 895-4418 <tel:%28425%29%20895-4418>
>
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
>
>
>
>
>
>


-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From ladasky at my-deja.com  Thu Sep 15 18:25:49 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 15:25:49 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
Message-ID: <80a631d9-9f5b-40bc-91a1-7657d5fc271a@w21g2000yql.googlegroups.com>

On Sep 15, 3:14?pm, Chris Angelico <ros... at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 6:52 AM, John Ladasky <lada... at my-deja.com> wrote:
> > Suppose that I have a second, parallelizable, long-running task T2
> > that I want to address in REAL TIME when the need arises. ?Using Pool,
> > is there a way for me to insert the chunks of T2 at the HEAD of the
> > task queue, instead of at its TAIL?
>
> That's a self-contradiction there. Even if you insert a task into the
> head of the queue, it won't be addressed in real time; the only way to
> do that would be to have a dedicated process, always ready to handle
> the real-time events, or else some kind of interrupt system.
>
> But if you just want them handled when there's a worker available,
> what you're after is a priority queue system. I don't know if one
> exists in Python already or not, but if not, it'd be a worthwhile
> addition.
>
> ChrisA

Hi, Chris,

Sorry if I'm not quite familiar with the proper terminology for
queues.  Let me try to define what I need as precisely as I can.

1) I aim to keep all five child Processes as busy as possible at all
times, crunching numbers.

2) I break my data for the low-priority task, T1, into large enough
chunks to benefit from multiprocessing, but small enough so that any
given Process should become available fairly frequently -- say, every
50 milliseconds.  Starting 50 milliseconds late would be close enough
to "real time" for my purposes.

3) But let's say that T1 still has twenty chunks in the Process queue
when T2 comes along.  I could be waiting 300 milliseconds for the
queue to empty.  If I could just ensure that T2 gets the next
available Processes, I would be happy.  Since T2 is also
parallelizable and I am using five child Processes, I would divide T2
into exactly five chunks.  These chunks should get inserted at
positions 0-4 in the queue rather than at 20-24.  T2 would briefly
commandeer all five Processes and then clear out.

If that's not putting T2 at the head of the queue, I guess I don't
know a better way to describe it.


From ladasky at my-deja.com  Thu Sep 15 18:32:43 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 15:32:43 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
Message-ID: <500f0c1f-fa8d-4f54-b1be-f0310ae347b3@1g2000vbu.googlegroups.com>

Ah. Now, see?  Having the right vocabulary helps.  Searching for
"priority queue" brings up this discussion from back in January:

http://groups.google.com/group/comp.lang.python/browse_frm/thread/b69aeced28634898

Now, this discussion refers to a PriorityPool class which doesn't
appear to be a standard part of Python (2.6, anyway).  But I'm not the
first one to ask the question, and there's code out there.


From rosuav at gmail.com  Thu Sep 15 18:32:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:32:53 +1000
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <j4thm7$ikt$1@dough.gmane.org>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<j4thm7$ikt$1@dough.gmane.org>
Message-ID: <CAPTjJmoLDVM7ocJy+vuZyzX8eVoL0kA_j7Q9tGwGgG=QFxrq5w@mail.gmail.com>

On Fri, Sep 16, 2011 at 4:54 AM, Terry Reedy <tjreedy at udel.edu> wrote:
> On 9/15/2011 1:19 AM, python at bdurham.com wrote:
>> I was thinking there might be a technique I could use to evaluate
>> regular expressions in a thread or another process launched via
>> multiprocessing module and then kill the thread/process after a
>> specified timeout period.
>
> Only solution I remember ever seen posted.

Then here's a minor refinement. Since long-running RE is the
exceptional case, optimize for the other. Keep the process around and
feed it all the jobs you get, and on problem, kill and respawn. That
way, you pay most of the overhead cost only when you make use of the
separation. (There's still some IPC overhead of course. Can't escape
that.)

ChrisA


From rosuav at gmail.com  Thu Sep 15 18:35:20 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:35:20 +1000
Subject: multiprocessing.Pool, its queue, and pre-emption
In-Reply-To: <80a631d9-9f5b-40bc-91a1-7657d5fc271a@w21g2000yql.googlegroups.com>
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
	<80a631d9-9f5b-40bc-91a1-7657d5fc271a@w21g2000yql.googlegroups.com>
Message-ID: <CAPTjJmrjB-2y4R4dO2qu9Ly8ovOrKGuX_qFw+VC+-xXQR+9-hw@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:25 AM, John Ladasky <ladasky at my-deja.com> wrote:
> Starting 50 milliseconds late would be close enough
> to "real time" for my purposes.
> ...
>
> If that's not putting T2 at the head of the queue, I guess I don't
> know a better way to describe it.

Yep, your terms are correct, with that caveat ("immediate" or "urgent"
without being "real-time"). So you're definitely looking for a
priority queue.

It may be possible to patch a different queue object straight into
Pool, but I've never done anything like that. It's probably best to
dig in the code and add an option somewhere to pass in a queue object
- that'd be a very useful feature imho.

ChrisA


From rosuav at gmail.com  Thu Sep 15 18:52:46 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 16 Sep 2011 08:52:46 +1000
Subject: multiprocessing.Pool, its queue, and pre-emption
In-Reply-To: <500f0c1f-fa8d-4f54-b1be-f0310ae347b3@1g2000vbu.googlegroups.com>
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<mailman.1186.1316124843.27778.python-list@python.org>
	<500f0c1f-fa8d-4f54-b1be-f0310ae347b3@1g2000vbu.googlegroups.com>
Message-ID: <CAPTjJmrBCdg+qAivuwW4KPVYKdbRJ0UcLWRQmQ6t2_3qOLUrGA@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:32 AM, John Ladasky <ladasky at my-deja.com> wrote:
> Ah. Now, see? ?Having the right vocabulary helps. ?Searching for
> "priority queue" brings up this discussion from back in January:
>
> http://groups.google.com/group/comp.lang.python/browse_frm/thread/b69aeced28634898
>
> Now, this discussion refers to a PriorityPool class which doesn't
> appear to be a standard part of Python (2.6, anyway). ?But I'm not the
> first one to ask the question, and there's code out there.

Awesome! I wasn't aware of that (although considering the volume of
traffic on this list, I doubt there's any human who knows everything
that's been discussed). Previously-solved problems save everyone a lot
of trouble.

ChrisA


From cs at zip.com.au  Thu Sep 15 18:54:40 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 16 Sep 2011 08:54:40 +1000
Subject: From Python on Solaris to Python on LINUX
In-Reply-To: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
References: <02dc01cc73bc$5bee1fc0$13ca5f40$@Diagorn@open-groupe.com>
Message-ID: <20110915225440.GA26026@cskk.homeip.net>

On 15Sep2011 17:30, Genevi?ve Diagorn <Genevieve.Diagorn at open-groupe.com> wrote:
| I work on projects developed in Python 2.3 on Solaris. The customer asks us
| to pass on LINUX in a recent version of Python.
| 
| Is it someone has already realized this modification? What are the traps to
| be avoided?
| 
| Is it a long and difficult phase?

Aside from the very minor things mentioned by others, only two things
occur to me:

  - if you use the struct module and you're moving from SPARC to Intel the
    endianness of some things may change

  - if you call external shell commands, there are (usually minor)
    differences between the Solaris and GNU toolsets

Neither seems likely to be a big problem and of course both are "outside
Python" in a sense. Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Do not taunt Happy Fun Coder.


From ramit.prasad at jpmorgan.com  Thu Sep 15 19:16:05 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 15 Sep 2011 19:16:05 -0400
Subject: help regarding extracting a smaller list from larger one
In-Reply-To: <4E727B4E.4000400@digipen.edu>
References: <CAKrT0TsMaLBi3KqZPmb7wkGNyk47iQgpkp9jdeb6Q4pbYGmFGQ@mail.gmail.com>
	<4E7234BF.5030101@digipen.edu>
	<CAKrT0TuW_iXoHbD3zWoCPqeCzXfmfPTn_w7Cgmk_ba1uqfZwLg@mail.gmail.com>
	<4E727B4E.4000400@digipen.edu>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16CF01B7@EMARC112VS01.exchad.jpmchase.net>

>Nevertheless, I think list comprehension is what you want:
>     [ x  for x in A  if 3.0 <= x <= 8.0 ]
>will extract all the values between 3 and 8 from the array A and create 
>a new list containing them.

>If you want the new list to be a numpy array then
>     numpy.array([ x  for x in A  if 3.0 <= x <= 8.0 ])


I have been told that the following is much faster than list generation for filtering if you are using numpy arrays. I have not looked to see if this claim is accurate, but since it was one of the SciPy creators....I trust him :) YMMV

foo = numpy.array([
	[1.2,2.3,1.3],
	[4.3,2.1,6.2],
	[3.2,1.2,6.5],
	[1.4,2.1,4.3]])
#if we want 2nd element > 2 and 3rd element < 6
mask = (foo[:,2]>2)&(foo[:,2]<6)
v = foo[mask] #this is a view and if you want a new list, you will have to wrap it
# I assume np.array(v) will create new array (untested).

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From sohel807 at gmail.com  Fri Sep 16 00:48:30 2011
From: sohel807 at gmail.com (Akand Islam)
Date: Thu, 15 Sep 2011 21:48:30 -0700 (PDT)
Subject: Comparisons of computation timing
Message-ID: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>

I have run my codes (written in Python) in my Notebook (3 GB Ram, Dual-
core CPU T4500 @ 2.3 GHz) and in my lab machine (11.57 GB Ram, i7-920
CPU @ 2.67 GHz). However, I have found execution time in Notebook
250.3 seconds, and in Lab machine 333.2 seconds. How is it possible?
Good configuration machine performs slower??? I reran the codes, same
finding whatsoever. I run Windows 7 in my laptop, and Ubuntu 11.04 in
lab machine. Both are 64 bit. When I ran my simulation in Notebook, I
also did some other stuffs; however for the case of lab machine I did
nothing other than running simulation only.

About the codes: Basically it simply solves some non-linear equations
using "fsolve" along with some other calculations.

I will appreciate if some one discusses about possible reasons? For
fair comparisons, in both machines I ran exactly the same codes. My
codes are not parallelized, is this the main reason i7 processes show
slower performance?

Thanks in advance,
Akand


From wm at localhost.localdomain  Fri Sep 16 01:46:52 2011
From: wm at localhost.localdomain (Waldek M.)
Date: Fri, 16 Sep 2011 07:46:52 +0200
Subject: Request for research feedback
References: <mailman.1172.1316103671.27778.python-list@python.org>
	<1oxwvsczcdfj4$.dlg@localhost.localdomain>
	<mailman.1183.1316117489.27778.python-list@python.org>
Message-ID: <1drj37uduixks$.dlg@localhost.localdomain>

On Thu, 15 Sep 2011 16:11:13 -0400, Prasad, Ramit wrote:
> I don't want to be rude but...
> Not rude:
> Rude:

You're right. I must have gotten a few bad habits I didn't
even realize. Thanks.

Waldek


From ladasky at my-deja.com  Fri Sep 16 02:31:49 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 15 Sep 2011 23:31:49 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
Message-ID: <cc4b4a8d-4fa9-4377-b0d1-7b1d25d23a7b@cd4g2000vbb.googlegroups.com>

On Sep 15, 1:52?pm, John Ladasky <lada... at my-deja.com> wrote:
> I've been snooping around inside Pool, and I would guess that what I
> want to do is to manipulate Pool._inqueue, which is a
> multiprocessing.queues.SimpleQueue object. ?I haven't found any
> documentation for SimpleQueue. ?It appears to have only the most
> rudimentary of public methods -- put, get, and empty.

Reading more deeply, I think that my first guess was incorrect.
There's also Pool._taskqueue, and it's a full-fledged Queue.  It
appears that map.async() puts pending jobs there, not in
Pool._inqueue.

If this is true, then all that should have to be done is to override a
few methods.  I'm going to try it.


From chunuan723 at gmail.com  Fri Sep 16 02:39:23 2011
From: chunuan723 at gmail.com (he sharon)
Date: Thu, 15 Sep 2011 23:39:23 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <43895317-a79b-44ef-b85e-9adccd37309a@i5g2000vbw.googlegroups.com>

our products:

red bull hats:  http://www.popbaseballhats.com/wholesale-113-b0-Red-Bull-Hats.html

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monster energy hats:
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monster energy t shirts:
http://www.popbaseballhats.com/wholesale-101-b0-Monster-Energy-T-Shirts.html

and so on. on our site: www.popbaseballhats.com


From 1248283536 at qq.com  Fri Sep 16 02:39:28 2011
From: 1248283536 at qq.com (=?utf-8?B?YWxpYXM=?=)
Date: Fri, 16 Sep 2011 14:39:28 +0800
Subject: parse  html:what is the meaning of "//"?
Message-ID: <tencent_72532068286D43F3549C09BB@qq.com>

code1:
import lxml.html
import urllib
down='http://finance.yahoo.com/q/op?s=C+Options'
content=urllib.urlopen(down).read()
root=lxml.html.document_fromstring(content)
table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
tds=table.xpath("tr[@valign='top']//td")
for  td  in tds:
    print  td.text_content()

what i get is :
Call Options
Expire at close Friday, September 16, 2011
these are waht i want.

code2
import lxml.html
 import urllib
 down='http://finance.yahoo.com/q/op?s=C+Options'
 content=urllib.urlopen(down).read()
 root=lxml.html.document_fromstring(content)
 table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
 tds=table.xpath("//tr[@valign='top']//td")
 for  td  in tds:
     print  td.text_content()

what i get is :
N/A
N/A
2
114
48.00
C110917P00048000
16.75
 0.00
N/A
N/A
0
23
50.00
C110917P00050000
23.16
 0.00
N/A
N/A
115
2,411
   
   
   
Highlighted options are in-the-money.
(omit  something)
there is only one difference between   code1 and code2  :
in code1 is :   tds=table.xpath("tr[@valign='top']//td")
in code2 is:   tds=table.xpath("//tr[@valign='top']//td")

i want to know  why  the  "//"  make output  different?
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From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Fri Sep 16 03:01:39 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Fri, 16 Sep 2011 09:01:39 +0200
Subject: Turkic I and re
In-Reply-To: <mailman.1163.1316092594.27778.python-list@python.org>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<mailman.1163.1316092594.27778.python-list@python.org>
Message-ID: <j4usl8$jel$1@r03.glglgl.eu>

Am 15.09.2011 15:16 schrieb Alan Plum:

> The Turkish 'I' is a peculiarity that will probably haunt us programmers
> until hell freezes over.

That's why it would have been nice if the Unicode guys had defined "both 
Turkish i-s" at separate codepoints.

Then one could have the three pairs
I, i ("normal")
I (other one), ?

and

?, i (the other one).

But alas, they haven't.


Thomas


From steve+comp.lang.python at pearwood.info  Fri Sep 16 03:19:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 16 Sep 2011 17:19:05 +1000
Subject: Comparisons of computation timing
References: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>
Message-ID: <4e72f86a$0$29976$c3e8da3$5496439d@news.astraweb.com>

Akand Islam wrote:

> I have run my codes (written in Python) in my Notebook (3 GB Ram, Dual-
> core CPU T4500 @ 2.3 GHz) and in my lab machine (11.57 GB Ram, i7-920
> CPU @ 2.67 GHz). However, I have found execution time in Notebook
> 250.3 seconds, and in Lab machine 333.2 seconds. How is it possible?
> Good configuration machine performs slower??? I reran the codes, same
> finding whatsoever. I run Windows 7 in my laptop, and Ubuntu 11.04 in
> lab machine. Both are 64 bit. When I ran my simulation in Notebook, I
> also did some other stuffs; however for the case of lab machine I did
> nothing other than running simulation only.

In a modern, multi-processing operating system like Windows, Mac OS or
Linux, you can *never* run only the simulation. There are always other
processes running. Even if you have no other applications running, the
system itself could have dozens or hundreds of processes running in the
background. On one of my Linux systems, a desktop running about four
applications, I have over two hundred processes:

[steve at orac ~]$ ps aux | wc -l
218

Without knowing more about the two systems, and the code you ran, it is
impossible to say why one is faster than the other. Your question is like
this:

"I drove from home to work with an old Toyota, and it took twenty minutes.
Then the next day, I borrowed my cousin's brand new Ferrari, and the same
journey took thirty minutes. How is this possible?"

On the Ubuntu machine, what does "ulimit -a" report? How does that compare
to the Window machine? Where there any cron jobs running at the time? Did
your Ubuntu system decide that this was a good time to download a whole lot
of system updates? Can you use the "nice" command to run at a higher
priority? Is your code limited by CPU, memory or disk I/O? Which desktop
environment is your Ubuntu system running, Gnome, Unity, KDE, Ratpoison, or
something else?

There could be dozens of factors that make a difference to speed.


> About the codes: Basically it simply solves some non-linear equations
> using "fsolve" along with some other calculations.

What is "fsolve"?



> I will appreciate if some one discusses about possible reasons? For
> fair comparisons, in both machines I ran exactly the same codes. My
> codes are not parallelized, is this the main reason i7 processes show
> slower performance?

Don't believe hardware manufacturer's advertising. These days, chip speed is
not so important. Cache misses are MUCH more critical: a slow chip with a
big cache will out-perform a fast chip with a small cache nearly always.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Fri Sep 16 03:25:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 16 Sep 2011 17:25:39 +1000
Subject: Turkic I and re
References: <4E71F763.2010109@mrabarnett.plus.com>
	<mailman.1163.1316092594.27778.python-list@python.org>
	<j4usl8$jel$1@r03.glglgl.eu>
Message-ID: <4e72f9f4$0$30003$c3e8da3$5496439d@news.astraweb.com>

Thomas Rachel wrote:

> Am 15.09.2011 15:16 schrieb Alan Plum:
> 
>> The Turkish 'I' is a peculiarity that will probably haunt us programmers
>> until hell freezes over.


Meh, I don't think it's much more peculiar that any other diacritic issue.
If I'm German or English, I probably want ? and O to match during
case-insensitive comparisons, so that Z?e and ZOE match. If I'm Icelandic,
I don't. I don't really see why Turkic gets singled out.


> That's why it would have been nice if the Unicode guys had defined "both
> Turkish i-s" at separate codepoints.
> 
> Then one could have the three pairs
> I, i ("normal")
> I (other one), ?
> 
> and
> 
> ?, i (the other one).

And then people will say, "How can I match both sorts of dotless uppercase I
but not dotted I when I'm doing comparisons?"



-- 
Steven



From nizamov.shawkat at gmail.com  Fri Sep 16 03:30:01 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Fri, 16 Sep 2011 09:30:01 +0200
Subject: Comparisons of computation timing
In-Reply-To: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>
References: <55375986-1841-4b6c-b921-089e649a4fa8@w21g2000yql.googlegroups.com>
Message-ID: <CAFwQ1Ss6OwysHCxO=qC02BzG1J4FJJfG_N=z9cBF2h7i2Tb-Cg@mail.gmail.com>

> About the codes: Basically it simply solves some non-linear equations
> using "fsolve" along with some other calculations.
>

Looks like you are using some third party libraries like numpy/scipy.
Do these libraries have the same version on both platforms?
What about python interpreter versions - are they the same?

Best regards,
Shavkat Nizamov


From johnjohn.tedro at gmail.com  Fri Sep 16 04:00:16 2011
From: johnjohn.tedro at gmail.com (John-John Tedro)
Date: Fri, 16 Sep 2011 08:00:16 +0000
Subject: Fwd: Turkic I and re
In-Reply-To: <CAJPn68RYjovir_WKBBiaaim3_0AAT86KECXQ_=_2x5VE+a4fhw@mail.gmail.com>
References: <4E71F763.2010109@mrabarnett.plus.com>
	<mailman.1163.1316092594.27778.python-list@python.org>
	<j4usl8$jel$1@r03.glglgl.eu>
	<4e72f9f4$0$30003$c3e8da3$5496439d@news.astraweb.com>
	<CAJPn68RYjovir_WKBBiaaim3_0AAT86KECXQ_=_2x5VE+a4fhw@mail.gmail.com>
Message-ID: <CAJPn68RS+7xOJhjqo-UX1QhudbuiVO-dsvMixBPGFKnOHP5Sog@mail.gmail.com>

On Fri, Sep 16, 2011 at 7:25 AM, Steven D'Aprano <
steve+comp.lang.python at pearwood.info> wrote:

> Thomas Rachel wrote:
>
> > Am 15.09.2011 15:16 schrieb Alan Plum:
> >
> >> The Turkish 'I' is a peculiarity that will probably haunt us programmers
> >> until hell freezes over.
>
>
> Meh, I don't think it's much more peculiar that any other diacritic issue.
> If I'm German or English, I probably want ? and O to match during
> case-insensitive comparisons, so that Z?e and ZOE match. If I'm Icelandic,
> I don't. I don't really see why Turkic gets singled out.
>
>
> > That's why it would have been nice if the Unicode guys had defined "both
> > Turkish i-s" at separate codepoints.
> >
> > Then one could have the three pairs
> > I, i ("normal")
> > I (other one), ?
> >
> > and
> >
> > ?, i (the other one).
>
> And then people will say, "How can I match both sorts of dotless uppercase
> I
> but not dotted I when I'm doing comparisons?"
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Yeah, it's more probable that language conventions and functions grow around
characters that look right.

No one except developers care what specific codepoint they have, so soon you
would have a mish-mash of special rules converting between each special
case.

P.S. Sorry Steven, i missed clicking "reply to all".

-- John-John Tedro
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From keobox at gmail.com  Fri Sep 16 05:30:08 2011
From: keobox at gmail.com (keobox)
Date: Fri, 16 Sep 2011 02:30:08 -0700 (PDT)
Subject: why ps/fname of a python interpreter changes across platforms?
Message-ID: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>

Hello,
I'm writing a little supervisor of some python scripts.
To check if the scrips are running I'm using the ps -o pid,fname
command on both RH Linux and solaris 10.
All the scripts are launched using "python script.py" command, they
are not launched with exec permissions.

I don't know why the fname of the python interpreter changes across
platforms.

I saw a "isapytho" in some solaris 10 platforms.
I saw "python2." in some Linux platforms.
On most platforms the value is "python".
Why?

Ok, I know that I can easily work around the problem by not using
"fname" and parse the ps output in another way, but I don't understand
how is possible that the combination of ps and python behaves so
badly.
Any idea?

Regards,
Cesare


From kevin.p.dwyer at gmail.com  Fri Sep 16 07:01:14 2011
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Fri, 16 Sep 2011 12:01:14 +0100
Subject: parse  html:what is the meaning of "//"?
References: <tencent_72532068286D43F3549C09BB@qq.com>
Message-ID: <j4va9r$m6r$1@dough.gmane.org>

alias wrote:

<snip>
>    
>    
>    
> Highlighted options are in-the-money.
> (omit  something)
> there is only one difference between   code1 and code2  :
> in code1 is :   tds=table.xpath("tr[@valign='top']//td")
> in code2 is:   tds=table.xpath("//tr[@valign='top']//td")
> 
> i want to know  why  the  "//"  make output  different?


This is an XPATH question, not really Python-related.

See http://www.w3schools.com/xpath/xpath_syntax.asp

Cheers,

Kev



From stefan_ml at behnel.de  Fri Sep 16 07:02:06 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 16 Sep 2011 13:02:06 +0200
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <tencent_72532068286D43F3549C09BB@qq.com>
References: <tencent_72532068286D43F3549C09BB@qq.com>
Message-ID: <j4vabe$njo$1@dough.gmane.org>

alias, 16.09.2011 08:39:
> code1:
> import lxml.html
> import urllib
> down='http://finance.yahoo.com/q/op?s=C+Options'
> content=urllib.urlopen(down).read()
> root=lxml.html.document_fromstring(content)

I see this quite often, but many people don't know that this can be 
simplified to

     import lxml.html
     url = 'http://finance.yahoo.com/q/op?s=C+Options'
     root = lxml.html.parse(url).getroot()

which is less code, but substantially more efficient.


> table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
> tds=table.xpath("tr[@valign='top']//td")
> for  td  in tds:
>      print  td.text_content()
>
> what i get is :
> Call Options
> Expire at close Friday, September 16, 2011
> these are waht i want.
>
> code2
> import lxml.html
>   import urllib
>   down='http://finance.yahoo.com/q/op?s=C+Options'
>   content=urllib.urlopen(down).read()
>   root=lxml.html.document_fromstring(content)
>   table = root.xpath("//table[@class='yfnc_mod_table_title1']")[0]
>   tds=table.xpath("//tr[@valign='top']//td")

Here, you are looking for all "tr" tags in the table recursively, instead 
of taking just the ones that are direct children of the "table" tag.

That's what "//" is there for, it's a recursive subtree selector. You might 
want to read up on XPath expressions.


> what i get is :
> N/A
> N/A
> 2
> 114
> 48.00
> C110917P00048000
> 16.75
>   0.00
> N/A
> N/A
> 0
> 23
> 50.00
> C110917P00050000
> 23.16
>   0.00
> N/A
> N/A
> 115
> 2,411
>
>
> Highlighted options are in-the-money.

I don't see any highlighting in your text above, and I don't know what you 
mean by "in-the-money".

Stefan



From andrea.crotti.0 at gmail.com  Fri Sep 16 07:13:15 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 16 Sep 2011 12:13:15 +0100
Subject: create a directory structure
Message-ID: <4E732F4B.3090409@gmail.com>

I would like to write a program which creates a directory structure and 
fills in a few templated fields some values passed in as arguments.

So for example
create_struct.py

might create
base_dir:
|_ sub_dir1:
    |_ sub_file1
...

It's quite simple in theory, but I would also like to make it very 
easily maintanable, for example with a nice representation of the 
structure (an INI file maybe).

Any ideas/advise on how to make it easy to write and to maintain?


From steve+comp.lang.python at pearwood.info  Fri Sep 16 07:13:43 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 16 Sep 2011 21:13:43 +1000
Subject: why ps/fname of a python interpreter changes across platforms?
References: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>
Message-ID: <4e732f68$0$29997$c3e8da3$5496439d@news.astraweb.com>

keobox wrote:

> Hello,
> I'm writing a little supervisor of some python scripts.
> To check if the scrips are running I'm using the ps -o pid,fname
> command on both RH Linux and solaris 10.
> All the scripts are launched using "python script.py" command, they
> are not launched with exec permissions.
> 
> I don't know why the fname of the python interpreter changes across
> platforms.

Ask the person who built the system, or the people who made the
distribution. They are free to name the Python executable anything they
like.



-- 
Steven



From yasar11732 at gmail.com  Fri Sep 16 07:34:37 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Fri, 16 Sep 2011 14:34:37 +0300
Subject: Fwd: why ps/fname of a python interpreter changes across platforms?
In-Reply-To: <CAFEUn8YFyNiF+U2L7JMMkV1adnYBUgJJb5H-_g4ZVzaELB1XvQ@mail.gmail.com>
References: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>
	<4e732f68$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<CAFEUn8YFyNiF+U2L7JMMkV1adnYBUgJJb5H-_g4ZVzaELB1XvQ@mail.gmail.com>
Message-ID: <CAFEUn8a4_jan6v1OdLFHUqOgTs46wsdfF95Gvv8NgKiio+kRBw@mail.gmail.com>

---------- Y?nlendirilmi? ileti ----------
Kimden: Ya?ar Arabac? <yasar11732 at gmail.com>
Tarih: 16 Eyl?l 2011 14:33
Konu: Re: why ps/fname of a python interpreter changes across platforms?
Kime: Steven D'Aprano <steve+comp.lang.python at pearwood.info>


For example, in arch linux, I had 3 different interpreters named python,
python26 and python27 because some of the applications needed one, and some
needed others. That might be the reason.


2011/9/16 Steven D'Aprano <steve+comp.lang.python at pearwood.info>

> keobox wrote:
>
> > Hello,
> > I'm writing a little supervisor of some python scripts.
> > To check if the scrips are running I'm using the ps -o pid,fname
> > command on both RH Linux and solaris 10.
> > All the scripts are launched using "python script.py" command, they
> > are not launched with exec permissions.
> >
> > I don't know why the fname of the python interpreter changes across
> > platforms.
>
> Ask the person who built the system, or the people who made the
> distribution. They are free to name the Python executable anything they
> like.
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://yasar.serveblog.net/




-- 
http://yasar.serveblog.net/
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From oktaysafak at superonline.com  Fri Sep 16 08:12:50 2011
From: oktaysafak at superonline.com (Oktay Safak)
Date: Fri, 16 Sep 2011 15:12:50 +0300
Subject: Turkic I and re
In-Reply-To: <j4usl8$jel$1@r03.glglgl.eu>
References: <4E71F763.2010109@mrabarnett.plus.com><mailman.1163.1316092594.27778.python-list@python.org>
	<j4usl8$jel$1@r03.glglgl.eu>
Message-ID: <4E733D42.90400@superonline.com>

Well, I'm a self taught Turkish python coder. I was bitten by this first 
in Python 2.3 and asked the group about it then. You can find the 
correspondence by googling "unicode bug in turkish characters? 
<http://mail.python.org/pipermail/python-list/2003-April/809637.html>" 
There are a couple of posts with that topic line but they don't come out 
in one thread. So check them all.

Anyway, to summarize, Martin v.L?wis answered my question back then and 
suggested some locale settings but the problem seems to be with Windows 
actually. His method worked on Linux, but not on windows. He said that 
Python delegates uppercasing of strings to the operating system on 
Windows, and Windows is broken there. What he said was:

"Python delegates the toupper call to the operating system. It does not,
in itself, include a database of lower/upper case conversions for all 
locales.

So there is nothing we can do about that; ask Microsoft."

So I ended up not asking Microsoft of course, but using [i?] in re and writing a couple of utility functions upper_tr(), lower_tr() and title_tr() etc to use in my own projects. But of course when foreign language names etc. are mixed in a text it blows but I can't see a way to avoid it when that's the case.

I hope this helps,


Oktay Safak



Thomas Rachel wrote:
> Am 15.09.2011 15:16 schrieb Alan Plum:
>
>> The Turkish 'I' is a peculiarity that will probably haunt us programmers
>> until hell freezes over.
>
> That's why it would have been nice if the Unicode guys had defined 
> "both Turkish i-s" at separate codepoints.
>
> Then one could have the three pairs
> I, i ("normal")
> I (other one), ?
>
> and
>
> ?, i (the other one).
>
> But alas, they haven't.
>
>
> Thomas
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From miki.tebeka at gmail.com  Fri Sep 16 09:08:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 16 Sep 2011 06:08:54 -0700 (PDT)
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <mailman.1196.1316162247.27778.python-list@python.org>
References: <mailman.1196.1316162247.27778.python-list@python.org>
Message-ID: <da9bc4e6-bcea-4ce3-83be-0265eeb9f585@glegroupsg2000goo.googlegroups.com>

As a side note, it's way easier to get this data using YQL. See for example:

http://developer.yahoo.com/yql/console/?q=show%20tables&env=store://datatables.org/alltableswithkeys#h=SELECT%20*%20FROM%20yahoo.finance.options%20WHERE%20symbol%3D%27C%27%20AND%20expiration%3D%272011-09%27

Which gives you the data in JSON format.

(See link at bottom for API URL)


From miki.tebeka at gmail.com  Fri Sep 16 09:08:54 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 16 Sep 2011 06:08:54 -0700 (PDT)
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <mailman.1196.1316162247.27778.python-list@python.org>
References: <mailman.1196.1316162247.27778.python-list@python.org>
Message-ID: <da9bc4e6-bcea-4ce3-83be-0265eeb9f585@glegroupsg2000goo.googlegroups.com>

As a side note, it's way easier to get this data using YQL. See for example:

http://developer.yahoo.com/yql/console/?q=show%20tables&env=store://datatables.org/alltableswithkeys#h=SELECT%20*%20FROM%20yahoo.finance.options%20WHERE%20symbol%3D%27C%27%20AND%20expiration%3D%272011-09%27

Which gives you the data in JSON format.

(See link at bottom for API URL)


From JKPeck at gmail.com  Fri Sep 16 09:09:30 2011
From: JKPeck at gmail.com (JKPeck)
Date: Fri, 16 Sep 2011 06:09:30 -0700 (PDT)
Subject: Strange Python internal error
Message-ID: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>

We have a user on Windows with Python 2.6 who gets this error message when executing an import statement.
    from extension import Template, Syntax, processcmd 
SystemError: ..\Objects\listobject.c:169: bad argument to internal function

The module can be imported directly via
import extension
with no problem.  And large numbers of other users execute this same code with no problem.

Does anybody have a clue as to how this might arise?

TIA,
Jon Peck


From 1248283536 at qq.com  Fri Sep 16 09:26:28 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Fri, 16 Sep 2011 21:26:28 +0800
Subject: parse  html:what is the meaning of "//"?
Message-ID: <tencent_0711CEFE2EF94E273B454283@qq.com>

through  the  following code,i get the content of webpage,
     import lxml.html
     url = 'http://finance.yahoo.com/q/op?s=C+Options'
     root = lxml.html.parse(url).getroot() 

with your method ,how can i get the content of webpage  in my python program?

------------------ Original ------------------
From:  "Miki Tebeka"<miki.tebeka at gmail.com>;
Date:  Fri, Sep 16, 2011 09:08 PM
To:  "python-list"<python-list at python.org>; 
Cc:  "python-list"<python-list at python.org>; 
Subject:  Re: parse  html:what is the meaning of "//"?

 
As a side note, it's way easier to get this data using YQL. See for example:

http://developer.yahoo.com/yql/console/?q=show%20tables&env=store://datatables.org/alltableswithkeys#h=SELECT%20*%20FROM%20yahoo.finance.options%20WHERE%20symbol%3D%27C%27%20AND%20expiration%3D%272011-09%27

Which gives you the data in JSON format.

(See link at bottom for API URL)
-- 
http://mail.python.org/mailman/listinfo/python-list
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From vincent.vandevyvre at swing.be  Fri Sep 16 09:52:16 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Fri, 16 Sep 2011 15:52:16 +0200
Subject: Different class 'str' between v3.
In-Reply-To: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
Message-ID: <4E735490.4060509@swing.be>

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From nobody at nowhere.com  Fri Sep 16 09:57:06 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 16 Sep 2011 14:57:06 +0100
Subject: Cancel or timeout a long running regular expression
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<mailman.1182.1316112919.27778.python-list@python.org>
Message-ID: <pan.2011.09.16.13.57.05.761000@nowhere.com>

On Thu, 15 Sep 2011 14:54:57 -0400, Terry Reedy wrote:

>> I was thinking there might be a technique I could use to evaluate
>> regular expressions in a thread or another process launched via
>> multiprocessing module and then kill the thread/process after a
>> specified timeout period.
> 
> Only solution I remember ever seen posted. I wonder if there are any 
> heuristics for detecting exponential time re's.

Exponential growth results from non-determinism, i.e. if there are
multiple transitions for a given character from a given state.

Common patterns include:

	...(a...)?a...
	...(a...)*a...
	...(a...)+a...

with a choice between matching the "a" at the start of the bracketed
pattern or the "a" following it.

	(xxxa...|xxxb...|xxxc...)

with a choice between branches which cannot be resolved until more data
has been read.

For re.search (as opposed to re.match):

	axxxa...

When axxx has been read, a following "a" gives a choice between
continuing the existing match with the second "a", or aborting and
matching against the first "a". For patterns which contain many copies of
the initial character, each copy creates another branch.

Also, using back-references in a regexp [sic] can be a significant
performance killer, as it rules out the use of a DFA (which, IIRC, Python
doesn't do anyhow) and can require brute-forcing many combinations. A
particularly bad case is:

	(a*)\1

matching against "aaaaaaaa...".

If the performance issue is with re.match/re.search rather than with
re.compile, one option is to use ctypes to access libc's regexp functions.
Those are likely to provide better searching throughput at the expense of
potentially increased compilation time.



From andrea.crotti.0 at gmail.com  Fri Sep 16 10:00:10 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 16 Sep 2011 15:00:10 +0100
Subject: create a directory structure
In-Reply-To: <4E732F4B.3090409@gmail.com>
References: <4E732F4B.3090409@gmail.com>
Message-ID: <4E73566A.1010808@gmail.com>

After some research, I think that paste-script is the best choice in 
this case.

I can define templates and I'll get my directory structure nicely 
populated for me.


From duncan.booth at invalid.invalid  Fri Sep 16 10:44:12 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 16 Sep 2011 14:44:12 GMT
Subject: why ps/fname of a python interpreter changes across platforms?
References: <014688d5-e917-4f58-80fc-0670e47f71d9@19g2000vbx.googlegroups.com>
Message-ID: <Xns9F629F22BAF67duncanbooth@127.0.0.1>

keobox <keobox at gmail.com> wrote:

> I don't know why the fname of the python interpreter changes across
> platforms.
> 
> I saw a "isapytho" in some solaris 10 platforms.
> I saw "python2." in some Linux platforms.
> On most platforms the value is "python".
> Why?
> 
It shows you part of the name of the program that is running.

On a typical Linux system you could run python using the default 
interpreter 'python', or you could be explicit about the version you want 
to run and use 'python2.4', 'python2.5', 'python2.6', 'python2.7', 
'python3.2' (all of these are available on the system in from of me). Of 
course 4 of those will be truncated to 'python2.' if you only look at the 
first 8 characters (which is what your command does) but you also get 
'python' and 'python3.'

That's why there's a lot of variation. I have no idea why it has a strange 
name on Solaris, maybe someone compiled their own private version.

-- 
Duncan Booth http://kupuguy.blogspot.com


From aspineux at gmail.com  Fri Sep 16 11:42:25 2011
From: aspineux at gmail.com (aspineux)
Date: Fri, 16 Sep 2011 08:42:25 -0700 (PDT)
Subject: pyzmail-0.9.9 mail library to read, compose and send emails easily,
	support for py3k
Message-ID: <c1be2c43-8892-4e05-8ccc-e7064737ebf5@t29g2000vby.googlegroups.com>

Now pyzmail include support for python 3.2 and above

pyzmail is a high level mail library for Python. It provides functions
and classes that help to read, compose and send emails. pyzmail exists
because their is no reasons that handling mails with Python would be
more difficult than with popular mail clients like Outlook or
Thunderbird. pyzmail hide the difficulties of the MIME structure and
MIME encoding/decoding. It also hide the problem of the
internationalized header encoding/decoding.

The library contains lot of sample and is very well documented.

http://www.magiksys.net/pyzmail/

Alain Spineux


From miki.tebeka at gmail.com  Fri Sep 16 12:13:14 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Fri, 16 Sep 2011 09:13:14 -0700 (PDT)
Subject: Strange Python internal error
In-Reply-To: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
Message-ID: <1e1f841b-dc17-42d3-bf88-86a27a92752e@glegroupsg2000goo.googlegroups.com>

Try to narrow it down:
from extension import Template
from extension import Syntax
from extension import processcmd 

Which one fails? What is this "extension" package?


From martin.schoon at gmail.com  Fri Sep 16 13:29:53 2011
From: martin.schoon at gmail.com (Martin =?UTF-8?Q?Sch=C3=B6=C3=B6n?=)
Date: 16 Sep 2011 17:29:53 GMT
Subject: Accessing matplotlib-users discussion group?
References: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>
	<d20cc76c-5ba6-4311-8459-0327134c8c49@u10g2000yqk.googlegroups.com>
Message-ID: <9dhfchFvt2U1@mid.individual.net>

On 2011-09-15, John Ladasky <ladasky at my-deja.com> wrote:
> Hate to bump this, but... I found Sourceforge's IRC, and tried to ask
> for help there, and it doesn't look like I can get any help until
> business hours tomorrow.  Anyone?

No help really but I 'joined' Sourceforge about a year ago and
had no problems whatsoever.

Could it be some anti-robot filter that's gotten overly picky?

/Martin


From ramit.prasad at jpmorgan.com  Fri Sep 16 13:52:33 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 13:52:33 -0400
Subject: ImportError: cannot import name dns
In-Reply-To: <CAAuurf+z7VWz=a99fhyMxHPWTO+ZWdNHLCR5MBFeYGQq0P86kQ@mail.gmail.com>
References: <CAAuurf+q=Z8sfD1GaNCKNAzFz=VzLVq2gUtHgjcsGLn7sFNXKg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F16BB4719@EMARC112VS01.exchad.jpmchase.net>
	<CAAuurf+z7VWz=a99fhyMxHPWTO+ZWdNHLCR5MBFeYGQq0P86kQ@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB5052@EMARC112VS01.exchad.jpmchase.net>

NOTE: This is all speculation on my part. I am hoping someone on the list will give us more concrete details.

1. check for "dns" in sys.modules (initially not found)
2. create new empty module, add it to sys.modules as "dns"
3. execute dns.py in new module namespace (executes "from foo import udp") 
It has not yet added anything defined in dns because it is still on import statement

4. check for "udp" in sys.modules (not found)
5. create new empty module, add it to sys.modules as "udp"
6. execute udp.py in new module namespace (executes "from foo import dns") 
Cannot do this because dns is still not defined even though it the name is in sys.modules and since we are still in the middle of the first statement defining dns, it raises an error.


7. check for "dns" in sys.modules (found!)
8. done executing udp.py
9. done executing dns.py

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



-----Original Message-----
From: Jack Bates [mailto:jack.bates at gmail.com] 
Sent: Wednesday, September 14, 2011 11:22 AM
To: Prasad, Ramit
Cc: python-list at python.org
Subject: Re: ImportError: cannot import name dns

> It is a circular dependency. Dns will try to import udp which will in turn import dns (again) in an endless cycle; instead an ImportError is raised.
>
> Circular dependency is a Bad Thing.

According to this documentation:

http://docs.python.org/reference/simple_stmts.html#grammar-token-import_stmt

http://effbot.org/zone/import-confusion.htm

 - I thought Python would do something like:

So I'd expect attempting to access symbols from "dns" while executing
udp.py to fail, because dns.py isn't done executing at this point.
However I don't attempt to access any symbols from "dns" - so I don't
expect this ImportError

What is my mistake?
This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From brandonfigura at gmail.com  Fri Sep 16 14:12:21 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 11:12:21 -0700 (PDT)
Subject: strange results
Message-ID: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>

I am having a problem with a graphics program that I created.
Actually, I don't know if it is the program or a bug in Python. The
code for the program is as follows;

from gasp import *

begin_graphics(width=640, height=480, title='Houses at Night',
background=color.BLACK)

def draw_house(x, y):
    a = (x, y  + 100)
    b = (x +50, y +140)
    c = (x +100, y + 100)
    Box((x, y), 100, 100, filled=True, color=color.BLUE)        # the
house
    Box((x + 35, y), 30, 50, filled=True, color=color.GREEN)        #
the door
    Circle((x + 62, y + 16), 1, filled=True, color=color.GOLD)
# the door knob
    Box((x + 20, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the left window
    Line((x + 20, y + 71), (x + 40, y + 71),
color=color.ORANGE)        # horizontal line (left window)
    Line((x + 29, y + 60), (x + 29, y + 80),
color=color.ORANGE)        # vertical line (left window)
    Box((x + 60, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the right window
    Line((x + 60, y + 71), (x + 80, y + 71),
color=color.ORANGE)        # horizontal line (right window)
    Line((x + 69, y + 60), (x + 69, y + 80),
color=color.ORANGE)        # vertical line (right window)
    Polygon([a, b, c], filled=True, color=color.RED)        # the roof

draw_house(20, 20)
draw_house(270, 20)
draw_house(520, 20)
draw_house(145, 180)
draw_house(395, 180)
draw_house(270, 340)

update_when('key_pressed')
end_graphics()
ends here, but it


When I run the program, I do not get any error messages but there are
parts of the 'draw_house' function missing on the canvas. Each call to
'draw_house has different things missing, they are not all the exact
same. There are some parts that show in one call to 'draw_house' that
do not show in others and visa versa. Does anyone have any idea what
may be going on?


From brandonfigura at gmail.com  Fri Sep 16 14:35:12 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 11:35:12 -0700 (PDT)
Subject: unexpected results
Message-ID: <13f31aba-e7e3-4697-96fa-74ab26bfc18a@s20g2000yql.googlegroups.com>

I am having a problem when I run a graphics program that I created. I
do not get an error when I run the program, there are just some weird
things going on. I do not know if it is the program causing the
problem or a bug in Python. Here is the code for the program:


from gasp import *

begin_graphics(width=640, height=480, title='Houses at Night',
background=color.BLACK)

def draw_house(x, y):        # function for drawing a house
    a = (x, y  + 100)        # 'a' coordinate for Polygon
    b = (x +50, y +140)        # 'b' coordinate for Polygon
    c = (x +100, y + 100)        # 'c' coordinate for Polygon
    Box((x, y), 100, 100, filled=True, color=color.BLUE)        # the
house
    Box((x + 35, y), 30, 50, filled=True, color=color.GREEN)        #
the door
    Circle((x + 62, y + 16), 1, filled=True, color=color.GOLD)
# the door knob
    Box((x + 20, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the left window
    Line((x + 20, y + 71), (x + 40, y + 71),
color=color.ORANGE)        # horizontal line (left window)
    Line((x + 29, y + 60), (x + 29, y + 80),
color=color.ORANGE)        # vertical line (left window)
    Box((x + 60, y + 60), 20, 20, filled=True,
color=color.YELLOW)        # the right window
    Line((x + 60, y + 71), (x + 80, y + 71),
color=color.ORANGE)        # horizontal line (right window)
    Line((x + 69, y + 60), (x + 69, y + 80),
color=color.ORANGE)        # vertical line (right window)
    Polygon([a, b, c], filled=True, color=color.RED)        # the roof

draw_house(20, 20)
draw_house(270, 20)
draw_house(520, 20)
draw_house(145, 180)
draw_house(395, 180)
draw_house(270, 340)

update_when('key_pressed')
end_graphics()



The program launches just fine, bringing up the gasp window like it
should. The problem is that almost all of the calls to 'draw_house'
are different. Some features will show up in one house but not in
another and visa versa. Does anyone have any idea what the problem may
be?


From brandonfigura at gmail.com  Fri Sep 16 14:39:54 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 11:39:54 -0700 (PDT)
Subject: unexpected results
References: <13f31aba-e7e3-4697-96fa-74ab26bfc18a@s20g2000yql.googlegroups.com>
Message-ID: <e7934b35-ad39-491b-981e-c59d0b7a853f@gz5g2000vbb.googlegroups.com>

Sorry, Everyone. I got an error when posting the first post and did'nt
come in to see if it had actually posted before I tried another post.




From ben.r.shepherd at gmail.com  Fri Sep 16 14:47:43 2011
From: ben.r.shepherd at gmail.com (Benshep)
Date: Fri, 16 Sep 2011 11:47:43 -0700 (PDT)
Subject: Using tuples to eliminate multiple dict values
Message-ID: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>

I need a dictionary that returns the same value for multiple keys.

i.e.

(1)   >>> dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
(2)   >>>dict[1]
(3)   'text'

I cant figure out what i need on line 2 to make this scenario work. Is
there a simple way to check if the a number is present in the key and
then return the value?

Thanks


From thatiparthysreenivas at gmail.com  Fri Sep 16 15:21:06 2011
From: thatiparthysreenivas at gmail.com (zombie)
Date: Fri, 16 Sep 2011 12:21:06 -0700 (PDT)
Subject: way to calculate 2**1000 without expanding it?
Message-ID: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>

Hi guys,
         i am writing a program to sum up the digits of a number 2**1000?
Is there a way/formula to do it without expanding it?



From ramit.prasad at jpmorgan.com  Fri Sep 16 15:28:07 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 15:28:07 -0400
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB52AB@EMARC112VS01.exchad.jpmchase.net>

-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Benshep
Sent: Friday, September 16, 2011 1:48 PM
To: python-list at python.org
Subject: Using tuples to eliminate multiple dict values

I need a dictionary that returns the same value for multiple keys.

i.e.

(1)   >>> dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
(2)   >>>dict[1]
(3)   'text'

I cant figure out what i need on line 2 to make this scenario work. Is
there a simple way to check if the a number is present in the key and
then return the value?

Thanks
----------------------------------------------------------------

I think I must be missing something. Can you not do the following?

>>> d = { 1:'text', 2:'text', 3:'text', 5:'other text', 6:'other text', 7:'other text' }
>>> d[1]
'text'



If you are they need to share the same value you can also do something like this.

>>> t1 = [ 'text' ]
>>> t2 = [ 'other text' ]
>>> d = { 1:t1, 2:t1, 3:t1, 5:t2, 6:t2, 7:t2 }
>>> d[1]
['text']
>>> d[1][0]='new text'
>>> d[2][0]
'new text'
>>> d
{1: ['new text'], 2: ['new text'], 3: ['new text'], 5: ['other text'], 6: ['other text'], 7: ['other text']}


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From python at mrabarnett.plus.com  Fri Sep 16 15:29:41 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 16 Sep 2011 20:29:41 +0100
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <4E73A3A5.3090209@mrabarnett.plus.com>

On 16/09/2011 19:47, Benshep wrote:
> I need a dictionary that returns the same value for multiple keys.
>
> i.e.
>
> (1)>>>  dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }

That will create a dict with 2 keys, both of which are tuples.

> (2)>>>dict[1]
> (3)   'text'
>
> I cant figure out what i need on line 2 to make this scenario work. Is
> there a simple way to check if the a number is present in the key and
> then return the value?
>
If you want multiple keys, then you must provide them separately:

my_dict = {1: 'text', 2: 'text', 3: 'text', 5: 'other text', 6 : 'other 
text', 7: 'other text'}

or use 'for' to iterate through the keys for each value:

my_dict = dict([(k, 'text') for k in (1, 2, 3)] + [(k, 'other text') for 
k in (5, 6, 7)])

or something similar.


From ben.r.shepherd at gmail.com  Fri Sep 16 15:47:14 2011
From: ben.r.shepherd at gmail.com (Benshep)
Date: Fri, 16 Sep 2011 12:47:14 -0700 (PDT)
Subject: Using tuples to eliminate multiple dict values
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
	<mailman.1209.1316201385.27778.python-list@python.org>
Message-ID: <3827f27a-8a37-4609-a9b1-62f06635c76d@hg2g2000vbb.googlegroups.com>

thanks,

I had a feeling that may be the way to go and my data just changed so
it will work better that way.

Thanks for the quick reply


From arnodel at gmail.com  Fri Sep 16 16:00:24 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 16 Sep 2011 21:00:24 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
Message-ID: <CAJ6cK1bqOP60hnR8D_XKaVjzkuR-MTK=Kx9ETwi_QgqOo7_prQ@mail.gmail.com>

On 16 September 2011 20:21, zombie <thatiparthysreenivas at gmail.com> wrote:
> Hi guys,
> ? ? ? ? i am writing a program to sum up the digits of a number 2**1000?
> Is there a way/formula to do it without expanding it?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

In base 2, the answer is 1 :)

Hopefully-helpfully-but-not-so-sure'ly yours,

--
Arnaud


From ian.g.kelly at gmail.com  Fri Sep 16 16:06:34 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 14:06:34 -0600
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
Message-ID: <CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>

On Fri, Sep 16, 2011 at 1:21 PM, zombie <thatiparthysreenivas at gmail.com> wrote:
> Hi guys,
> ? ? ? ? i am writing a program to sum up the digits of a number 2**1000?
> Is there a way/formula to do it without expanding it?

Possibly, but why worry about it?  It's only around 300 digits.

Since this sounds like homework, I won't post the one-liner I used to
do it the brute-force way, but I will note that it takes about 200
microseconds to run on my laptop.

Cheers,
Ian


From ramit.prasad at jpmorgan.com  Fri Sep 16 16:16:03 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 16:16:03 -0400
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB53D3@EMARC112VS01.exchad.jpmchase.net>

>> Hi guys,
>>         i am writing a program to sum up the digits of a number 2**1000?
>> Is there a way/formula to do it without expanding it?

>Since this sounds like homework, I won't post the one-liner I used to
>do it the brute-force way, but I will note that it takes about 200
>microseconds to run on my laptop.

If you happen to be new to Python, I will say I used these functions to create a one liner (in alphabetical order).

Int
Lambda
Map
Reduce
Str


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From arnodel at gmail.com  Fri Sep 16 16:17:45 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 16 Sep 2011 21:17:45 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
Message-ID: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>

On 16 September 2011 21:06, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 1:21 PM, zombie <thatiparthysreenivas at gmail.com> wrote:
>> Hi guys,
>> ? ? ? ? i am writing a program to sum up the digits of a number 2**1000?
>> Is there a way/formula to do it without expanding it?
>
> Possibly, but why worry about it? ?It's only around 300 digits.
>
> Since this sounds like homework, I won't post the one-liner I used to
> do it the brute-force way, but I will note that it takes about 200
> microseconds to run on my laptop.

Ah go on, let's make a codegolf contest out of it.
My entry:

>>> sum(map(int,str(2**1000)))
1366

-- 
Arnaud


From ian.g.kelly at gmail.com  Fri Sep 16 16:20:46 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 14:20:46 -0600
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
Message-ID: <CALwzidkhGCx05gART7sa1p7DKDvLA4zXpFvnX9CJQY45zuSdKg@mail.gmail.com>

On Fri, Sep 16, 2011 at 2:17 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> Ah go on, let's make a codegolf contest out of it.
> My entry:
>
>>>> sum(map(int,str(2**1000)))
> 1366

That is exactly what mine was.


From nagle at animats.com  Fri Sep 16 16:50:45 2011
From: nagle at animats.com (John Nagle)
Date: Fri, 16 Sep 2011 13:50:45 -0700
Subject: Why do closures do this?
In-Reply-To: <mailman.501.1314505201.27778.python-list@python.org>
References: <20110828134505.795cd32b8fc5ccc472f85ae3@johnohagan.com>
	<mailman.501.1314505201.27778.python-list@python.org>
Message-ID: <4e73b6a7$0$1667$742ec2ed@news.sonic.net>

On 8/27/2011 9:19 PM, Terry Reedy wrote:
> On 8/27/2011 11:45 PM, John O'Hagan wrote:
>> Somewhat apropos of the recent "function principle" thread, I was
>> recently surprised by this:
>>
>> funcs=[]
>> for n in range(3):
>> def f():
>> return n
>> funcs.append(f)
>>
>>
>>
>> The last expression, IMO surprisingly, is [2,2,2], not [0,1,2].

    That's correct behavior, because a closure captures the binding of
a nonlocal variable, not its value.  There is only one "n" for all
iterations.

    If you create a local variable within the closed function:

        def f()
            localn = n
            return(localn)

there's a copy of "localn" for each iteration, and you're returning
it.

Try this in PyPy, which tries not to box numbers, and see what happens
there.  This is one of those Python features which complicates
optimization.  For performance, an implementation should handle numbers
as machine numbers, not objects.  (Creating an object to hold a
machine primitive like an int, float, or bool is called "boxing' the
number.)  CPython always carries around a full
CObject for ordinary numbers, which is why CPython numeric performance
is so bad.  PyPy tries not to do that, although there are rare
cases when it has to, like this one.

					John Nagle


From gherron at digipen.edu  Fri Sep 16 16:53:10 2011
From: gherron at digipen.edu (Gary Herron)
Date: Fri, 16 Sep 2011 13:53:10 -0700
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
Message-ID: <4E73B736.7060401@digipen.edu>

On 09/16/2011 01:17 PM, Arnaud Delobelle wrote:
> On 16 September 2011 21:06, Ian Kelly<ian.g.kelly at gmail.com>  wrote:
>> On Fri, Sep 16, 2011 at 1:21 PM, zombie<thatiparthysreenivas at gmail.com>  wrote:
>>> Hi guys,
>>>          i am writing a program to sum up the digits of a number 2**1000?
>>> Is there a way/formula to do it without expanding it?
>> Possibly, but why worry about it?  It's only around 300 digits.
>>
>> Since this sounds like homework, I won't post the one-liner I used to
>> do it the brute-force way, but I will note that it takes about 200
>> microseconds to run on my laptop.
> Ah go on, let's make a codegolf contest out of it.
> My entry:
>
>>>> sum(map(int,str(2**1000)))
> 1366
>

Here's another one-liner using a generator instead of map:

     sum(int(c) for c in str(2**1000))

Gary Herron



-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From arnodel at gmail.com  Fri Sep 16 16:57:12 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 16 Sep 2011 21:57:12 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CALwzidkhGCx05gART7sa1p7DKDvLA4zXpFvnX9CJQY45zuSdKg@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<CALwzidkhGCx05gART7sa1p7DKDvLA4zXpFvnX9CJQY45zuSdKg@mail.gmail.com>
Message-ID: <CAJ6cK1bZXnf2ujif2qX2ctEfDwR1Vfr3E49vw57HoRyNaywa-Q@mail.gmail.com>

On 16 September 2011 21:20, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 2:17 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
>> Ah go on, let's make a codegolf contest out of it.
>> My entry:
>>
>>>>> sum(map(int,str(2**1000)))
>> 1366
>
> That is exactly what mine was.
>

Slightly longer:

>>> eval("+".join(str(2**1000)))
1366

This looks like a winner but I cheated (the result depends on the
state of the interpreter):

>>> eval("+".join(`2**1000`))
1366

-- 
Arnaud


From stefan-usenet at bytereef.org  Fri Sep 16 17:07:31 2011
From: stefan-usenet at bytereef.org (Stefan Krah)
Date: Fri, 16 Sep 2011 23:07:31 +0200
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <4E73B736.7060401@digipen.edu>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<4E73B736.7060401@digipen.edu>
Message-ID: <20110916210731.GA20553@sleipnir.bytereef.org>

Gary Herron <gherron at digipen.edu> wrote:
>>>> i am writing a program to sum up the digits of a number 2**1000?
>>>> Is there a way/formula to do it without expanding it?
>
> Here's another one-liner using a generator instead of map:
>
>     sum(int(c) for c in str(2**1000))

The OP did not specify the base:

>>> bin(2**1000).count('1')
1


Or just:

>>> print(1)
1


Stefan Krah




From ramit.prasad at jpmorgan.com  Fri Sep 16 17:13:38 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 16 Sep 2011 17:13:38 -0400
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F16DB54F7@EMARC112VS01.exchad.jpmchase.net>

>>> sum(map(int,str(2**1000)))
*smacks face* Gah, forgot about sum.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From tjreedy at udel.edu  Fri Sep 16 18:01:27 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 16 Sep 2011 18:01:27 -0400
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <pan.2011.09.16.13.57.05.761000@nowhere.com>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<mailman.1182.1316112919.27778.python-list@python.org>
	<pan.2011.09.16.13.57.05.761000@nowhere.com>
Message-ID: <j50gvt$bs0$1@dough.gmane.org>

On 9/16/2011 9:57 AM, Nobody wrote:
>>I wonder if there are any
>> heuristics for detecting exponential time re's.
>
> Exponential growth results from non-determinism, i.e. if there are
> multiple transitions for a given character from a given state.
>
> Common patterns include:
>
> 	...(a...)?a...
> 	...(a...)*a...
> 	...(a...)+a...
>
> with a choice between matching the "a" at the start of the bracketed
> pattern or the "a" following it.
>
> 	(xxxa...|xxxb...|xxxc...)
>
> with a choice between branches which cannot be resolved until more data
> has been read.
>
> For re.search (as opposed to re.match):
>
> 	axxxa...
>
> When axxx has been read, a following "a" gives a choice between
> continuing the existing match with the second "a", or aborting and
> matching against the first "a". For patterns which contain many copies of
> the initial character, each copy creates another branch.
>
> Also, using back-references in a regexp [sic] can be a significant
> performance killer, as it rules out the use of a DFA (which, IIRC, Python
> doesn't do anyhow) and can require brute-forcing many combinations. A
> particularly bad case is:
>
> 	(a*)\1
>
> matching against "aaaaaaaa...".
>
> If the performance issue is with re.match/re.search rather than with
> re.compile, one option is to use ctypes to access libc's regexp functions.
> Those are likely to provide better searching throughput at the expense of
> potentially increased compilation time.

Now, can you write that as a heuristic *algorithm* def 
dangerous_re(some_re):?

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Fri Sep 16 18:16:43 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 16 Sep 2011 18:16:43 -0400
Subject: parse  html:what is the meaning of "//"?
In-Reply-To: <j4vabe$njo$1@dough.gmane.org>
References: <tencent_72532068286D43F3549C09BB@qq.com>
	<j4vabe$njo$1@dough.gmane.org>
Message-ID: <j50hsi$heo$1@dough.gmane.org>

On 9/16/2011 7:02 AM, Stefan Behnel wrote:

>> 0.00
>> N/A
>> N/A
>> 115
>> 2,411
>>
>>
>> Highlighted options are in-the-money.
>
> I don't see any highlighting in your text above,

Gone with the ascii conversion.

> and I don't know what you mean by "in-the-money".

If a stock sells now for $20, an option to buy it for $19 is 
in-the-money and has definite value while an option to buy it for $21 is 
not, but is out-of-the-money and only has value according to one's 
subjective estimate of the likelihood of a rise above $21 before the 
option expires.

-- 
Terry Jan Reedy



From emekamicro at gmail.com  Fri Sep 16 18:19:05 2011
From: emekamicro at gmail.com (Emeka)
Date: Sat, 17 Sep 2011 00:19:05 +0200
Subject: Code Review
Message-ID: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>

Hello All,

While learning Python I put together another Text Twist. I would want
somebody to go through it and comment.
https://github.com/janus/Text-Twist

-- 

Regards,
Emeka
*


*
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From tjreedy at udel.edu  Fri Sep 16 18:30:03 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 16 Sep 2011 18:30:03 -0400
Subject: Different class 'str' between v3.
In-Reply-To: <4E735490.4060509@swing.be>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
	<4E735490.4060509@swing.be>
Message-ID: <j50ilh$llp$1@dough.gmane.org>

On 9/16/2011 9:52 AM, Vincent Vande Vyvre wrote:
> Testing the following code, I've differend return with python 3.1.2 and
> 3.2.2

running on two different machines with two different versions of Linux.

I get

> # -*- coding: utf-8 -*-
>
> import os
> import sys
> import platform
>
> print('\nPython version: ', sys.version.split()[0])
> print(platform.platform())
>
> paths = ['/home/vincent/image.jpg', '/home/vincent/?????.jpg']
>
> for path in paths:
> print('\nPath: {0}, Type: {1}'.format(path, type(path)))
> if not os.path.exists(path) or not os.path.isfile(path):
> print('File not found: {0}'.format(path))
> else:
> print('File exists')

I get

Python version:  3.2.2rc1
Windows-7-6.1.7601-SP1

Path: /home/vincent/image.jpg, Type: <class 'str'>
File not found: /home/vincent/image.jpg

Path: /home/vincent/?????.jpg, Type: <class 'str'>
File not found: /home/vincent/?????.jpg

so

> [vincent at myhost ~]$ python string_2.py
>
> Python version: 3.2.2
> Linux-3.0-ARCH-x86_64-Pentium-R-_Dual-Core_CPU_T4500_ at _2.30GHz-with-glibc2.2.5
>
> Path: /home/vincent/image.jpg, Type: <class 'str'>
> File exists
> Traceback (most recent call last):
> File "string_2.py", line 13, in <module>
> print('\nPath: {0}, Type: {1}'.format(path, type(path)))
> UnicodeEncodeError: 'ascii' codec can't encode characters in position
> 21-25: ordinal not in range(128)

is not specific to 3.2.2 in general. Try the two Python versions on the 
same machine. Or try the test suite on each. See the test module doc for 
how.

-- 
Terry Jan Reedy




From brandonfigura at gmail.com  Fri Sep 16 19:09:33 2011
From: brandonfigura at gmail.com (Fig)
Date: Fri, 16 Sep 2011 16:09:33 -0700 (PDT)
Subject: strange results
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
Message-ID: <c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>

I took out all of the color commands that were in the shape functions
and all of the features to the 'draw_house' function showed showed up.
I started putting the color commands back into the shape functions and
have no problems with some of them but when I put the color command
back into others, some of the features start to disappear. As far as I
can see, all of the code is right but I'm just a beginner so I am not
for sure. Can anyone tell me why this is doing what it is.



From rosuav at gmail.com  Fri Sep 16 19:19:53 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 17 Sep 2011 09:19:53 +1000
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <CAPTjJmqMhHRv=Uy45fh1rDuXxPOrghXiYSCpE-8WigB20=o7Zw@mail.gmail.com>

On Sat, Sep 17, 2011 at 4:47 AM, Benshep <ben.r.shepherd at gmail.com> wrote:
> (1) ? >>> dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
>

As I understand it, you're looking for a simple syntax for what MRAB posted:
> my_dict = {1: 'text', 2: 'text', 3: 'text', 5: 'other text', 6 : 'other text', 7: 'other text'}

Since your first line of code is syntactically legal, you could do a
simple check afterwards to translate it:

my_dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
for k in list(my_dict.keys()):
    if isinstance(k,tuple):
        val=my_dict.pop(k)
        for i in k: my_dict[i]=val

Tested in Python 3.2; in Python 2, the list() call is superfluous,
everything else should work fine.

Chris Angelico


From ian.g.kelly at gmail.com  Fri Sep 16 19:28:39 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 17:28:39 -0600
Subject: Different class 'str' between v3.
In-Reply-To: <4E735490.4060509@swing.be>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
	<4E735490.4060509@swing.be>
Message-ID: <CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>

On Fri, Sep 16, 2011 at 7:52 AM, Vincent Vande Vyvre
<vincent.vandevyvre at swing.be> wrote:
> [vincent at myhost ~]$ python string_2.py
>
> Python version:? 3.2.2
> Linux-3.0-ARCH-x86_64-Pentium-R-_Dual-Core_CPU_T4500_ at _2.30GHz-with-glibc2.2.5
>
> Path: /home/vincent/image.jpg, Type: <class 'str'>
> File exists
> Traceback (most recent call last):
> ? File "string_2.py", line 13, in <module>
> ??? print('\nPath: {0}, Type: {1}'.format(path, type(path)))
> UnicodeEncodeError: 'ascii' codec can't encode characters in position 21-25:
> ordinal not in range(128)

This looks like a terminal encoding issue on the second PC.  Your
terminal is probably not using a unicode encoding, and so it is unable
to print a unicode string.

Cheers,
Ian


From ppaterson at gmail.com  Fri Sep 16 19:48:08 2011
From: ppaterson at gmail.com (Paul Paterson)
Date: Fri, 16 Sep 2011 16:48:08 -0700 (PDT)
Subject: setuptools: getting data files to be installed
Message-ID: <9476205.3046.1316216888277.JavaMail.geo-discussion-forums@prdy8>

I'm having a problem using setuptools to create a distribution for a project that includes data files. I can get the data files to be included in the zipped package file (*.tar.gz) but when I easy_install the package the data files are not installed. (Ubuntu 11.04, Python2.7).

I'm trying to use easy_install because the project is a game with dependencies and so it would be nice for easy_install to handle all that for people.


My setup.py file is below at the end of the post. 

I create the zip with,

> python setup.py egg_info
...
> python setup.py sdist

Then the dist/tacman-0.1.tar.gz includes my data files as identified in the MANIFEST.in file.

But when I do,

> sudo easy_install dist/tacman-0.1.tar.gz

... the python modules appear in /usr/local/lib/python27/dist-packages/tacman-0.1-py2.7.egg but the data files are nowhere to be seen. I tried locating them using pkg_resources but that didn't help. Some Googling suggested /usr/share as a location but they weren't there either.

Am I looking in the right place or did they just not get installed?

The whole distribution file is at http://perpetualpyramid.com/tacman-0.1.tar.gz in case that helps. The file is bit large because it is a game and the zip includes the music and graphics.

Thanks for any help and pointers.

Paul

--- setup.py ---

from setuptools import setup, find_packages

import game.common

setup(name='tacman',
      version=game.common.version,
      scripts=['tacman.py'], 
      entry_points = {
        'console_scripts' : [
            'tacman = tacman.tacman',
        ]
      },
      description='A tactical, turn-based clone on PACMAN',
      author='Paul Paterson',
      author_email='ppaterson at gmail.com',
      url='http://www.perpetualpyramid/tacman.html',
      download_url=('http://perpetualpyramid.com/tacman-%s.tar.gz' % game.common.version),

      include_package_data=True,
      zip_safe=False,
      
      packages=[
        'serge', 'serge.blocks', 'serge.tools', 'serge.tools.template', 'game',
      ],
      package_dir={'':'.'},

      classifiers = [
        "Programming Language :: Python",
        "Programming Language :: Python :: 2",
        "Development Status :: 4 - Beta",
        "Environment :: Other Environment",
        "Intended Audience :: End Users/Desktop",
        "License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)",
        "Operating System :: OS Independent",
        "Topic :: Games/Entertainment",
        "Topic :: Games/Entertainment :: Puzzle Games",
        ],
       install_requires=[
         'pygame', 'networkx',
       ],
       long_description='''\
TACMAN
------

A turn-based, tactical version of PACMAN.

Play a PACMAN clone where the action is turn based. You move and then the 
ghosts move. The turn-based action adds additional tactical elements to the
game and allows you to plan ahead and outwit the ghosts!

Requires: Python 2.6+, pygame 1.9+, networkx

''',
         )


From python.list at tim.thechases.com  Fri Sep 16 19:48:40 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 16 Sep 2011 18:48:40 -0500
Subject: Using tuples to eliminate multiple dict values
In-Reply-To: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
References: <f01c3039-9e5c-4155-bd45-f38c970db019@v18g2000yqj.googlegroups.com>
Message-ID: <4E73E058.6010303@tim.thechases.com>

On 09/16/11 13:47, Benshep wrote:
> I need a dictionary that returns the same value for multiple keys.
>
> i.e.
>
> (1)>>>  dict = { (1,2,3) : 'text' , (5,6,7) : 'other text' }
> (2)>>>dict[1]
> (3)   'text'
>
> I cant figure out what i need on line 2 to make this scenario work. Is
> there a simple way to check if the a number is present in the key and
> then return the value?

You could use something like

  d = dict(
    (k,v)
    for keys in (
      ((1,2,3), 'text'),
      ((5,6,7), 'other text'),
      )
    for k in keys
    )

which seems to do what you want with minimal redundancy of 
declarations.

-


From steve+comp.lang.python at pearwood.info  Fri Sep 16 22:17:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 17 Sep 2011 12:17:05 +1000
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<mailman.1213.1316204268.27778.python-list@python.org>
Message-ID: <4e740322$0$29983$c3e8da3$5496439d@news.astraweb.com>

Arnaud Delobelle wrote:

> Ah go on, let's make a codegolf contest out of it.
> My entry:
> 
>>>> sum(map(int,str(2**1000)))
> 1366


Time for some obfuscated Python!

b = (16,13624)
for i in range(23, 42, 3):
    b = (b[0]*b[0], b[1]+1024)

for j in range(12345, 8929, -7):
    b = (b[0]+b[0], b[1]-3)

while b > (0,9876):
    b = tuple((lambda a,b: map(lambda a,b:a+b, a,b))
        ((lambda a,b: map(lambda a,b:a*b, a,b))
        (b,(0,1)), (lambda a,b: map(lambda a,b:a-b, a,b))
        (divmod(b[0],10),(0,64))))

print b[1]



-- 
Steven



From invalid at invalid.invalid  Fri Sep 16 22:19:12 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 17 Sep 2011 02:19:12 +0000 (UTC)
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<mailman.1215.1316206402.27778.python-list@python.org>
Message-ID: <j51030$gie$1@reader1.panix.com>

On 2011-09-16, Gary Herron <gherron at digipen.edu> wrote:
> On 09/16/2011 01:17 PM, Arnaud Delobelle wrote:
>> On 16 September 2011 21:06, Ian Kelly<ian.g.kelly at gmail.com>  wrote:
>>> On Fri, Sep 16, 2011 at 1:21 PM, zombie<thatiparthysreenivas at gmail.com>  wrote:
>>>> Hi guys,
>>>>          i am writing a program to sum up the digits of a number 2**1000?
>>>> Is there a way/formula to do it without expanding it?
>>> Possibly, but why worry about it?  It's only around 300 digits.
>>>
>>> Since this sounds like homework, I won't post the one-liner I used to
>>> do it the brute-force way, but I will note that it takes about 200
>>> microseconds to run on my laptop.
>> Ah go on, let's make a codegolf contest out of it.
>> My entry:
>>
>>>>> sum(map(int,str(2**1000)))
>> 1366
>>
>
> Here's another one-liner using a generator instead of map:
>
>      sum(int(c) for c in str(2**1000))

Just in case you can't spare the 3KB required for the list of integers
that map creates. :)

In this case it doesn't matter, but it's not hard to find problems
where the difference between the memory requirements for a generator
and a map/list-comprehension are significant enough to worry about.

-- 
Grant



From chunuan723 at gmail.com  Fri Sep 16 22:56:41 2011
From: chunuan723 at gmail.com (he sharon)
Date: Fri, 16 Sep 2011 19:56:41 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <18e9f5c3-055e-4515-a7dc-517f46e90ec5@s2g2000vby.googlegroups.com>

our products:

red bull hats:  http://www.popbaseballhats.com/wholesale-113-b0-Red-Bull-Hats.html

red bull beanies: http://www.popbaseballhats.com/wholesale-112-b0-Red-Bull-Beanies.html

red bull t shirts: http://www.popbaseballhats.com/wholesale-114-b0-Red-Bull-T-Shirts.html

monster energy hats:
http://www.popbaseballhats.com/wholesale-100-b0-Monster-Energy-Hats.html

monster energy t shirts:
http://www.popbaseballhats.com/wholesale-101-b0-Monster-Energy-T-Shirts.html

and so on.on our site: http://www.popbaseballhats.com/


From chunuan723 at gmail.com  Fri Sep 16 22:58:59 2011
From: chunuan723 at gmail.com (he sharon)
Date: Fri, 16 Sep 2011 19:58:59 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <c81f9961-fd04-4b36-bc04-4ee7679c735e@w28g2000yqw.googlegroups.com>

our products:

red bull hats:  http://www.popbaseballhats.com/wholesale-113-b0-Red-Bull-Hats.html

red bull beanies: http://www.popbaseballhats.com/wholesale-112-b0-Red-Bull-Beanies.html

red bull t shirts: http://www.popbaseballhats.com/wholesale-114-b0-Red-Bull-T-Shirts.html

monster energy hats:
http://www.popbaseballhats.com/wholesale-100-b0-Monster-Energy-Hats.html

monster energy t shirts:
http://www.popbaseballhats.com/wholesale-101-b0-Monster-Energy-T-Shirts.html

and so on.on our site: http://www.popbaseballhats.com/



From ian.g.kelly at gmail.com  Fri Sep 16 23:11:44 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Fri, 16 Sep 2011 21:11:44 -0600
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <j51030$gie$1@reader1.panix.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<mailman.1215.1316206402.27778.python-list@python.org>
	<j51030$gie$1@reader1.panix.com>
Message-ID: <CALwzidnzYvPL=TabXsQmc2m+86ZBTdWrj0tbQf-hkkwGbyTsUQ@mail.gmail.com>

On Fri, Sep 16, 2011 at 8:19 PM, Grant Edwards <invalid at invalid.invalid> wrote:
>> Here's another one-liner using a generator instead of map:
>>
>> ? ? ?sum(int(c) for c in str(2**1000))
>
> Just in case you can't spare the 3KB required for the list of integers
> that map creates. :)
>
> In this case it doesn't matter, but it's not hard to find problems
> where the difference between the memory requirements for a generator
> and a map/list-comprehension are significant enough to worry about.

Unless otherwise specified, I generally assume that code on this list
is for Python 3, and map in Python 3 returns an iterator.

Cheers,
Ian


From vincent.vandevyvre at swing.be  Fri Sep 16 23:28:25 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sat, 17 Sep 2011 05:28:25 +0200
Subject: Different class 'str' between v3.
In-Reply-To: <CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>
	<4E735490.4060509@swing.be>
	<CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>
Message-ID: <4E7413D9.4000706@swing.be>

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From vincent.vandevyvre at swing.be  Sat Sep 17 00:55:41 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sat, 17 Sep 2011 06:55:41 +0200
Subject: Different class 'str' between v3.
In-Reply-To: <4E7413D9.4000706@swing.be>
References: <10b34bf7-ecd0-472d-8c69-634d7e6ed77f@glegroupsg2000goo.googlegroups.com>	<4E735490.4060509@swing.be>	<CALwzidnKQJF_mafYYDBezzUkKRwV8k+KTeuG1=fPiK6SMN=z_Q@mail.gmail.com>
	<4E7413D9.4000706@swing.be>
Message-ID: <4E74284D.7090900@swing.be>

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From alex.kapps at web.de  Sat Sep 17 02:59:10 2011
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 17 Sep 2011 08:59:10 +0200
Subject: strange results
In-Reply-To: <c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
	<c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
Message-ID: <4E74453E.2020908@web.de>

On 17.09.2011 01:09, Fig wrote:
> I took out all of the color commands that were in the shape functions
> and all of the features to the 'draw_house' function showed showed up.
> I started putting the color commands back into the shape functions and
> have no problems with some of them but when I put the color command
> back into others, some of the features start to disappear. As far as I
> can see, all of the code is right but I'm just a beginner so I am not
> for sure. Can anyone tell me why this is doing what it is.
>

Just tried your program on Ubuntu 10.04 with Python 2.6.5 and GASP 
0.3.3 and it worked fine. What OS, Python version and GASP version 
are you using?

If you don't get an answer here, try asking on the Launchpad project 
site:

https://launchpad.net/gasp


From ladasky at my-deja.com  Sat Sep 17 03:26:19 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 17 Sep 2011 00:26:19 -0700 (PDT)
Subject: Accessing matplotlib-users discussion group?
References: <4a923fa6-47ad-4083-8770-a2b23446dadf@br5g2000vbb.googlegroups.com>
	<d20cc76c-5ba6-4311-8459-0327134c8c49@u10g2000yqk.googlegroups.com>
	<9dhfchFvt2U1@mid.individual.net>
Message-ID: <03b8d48e-4fdf-4aaf-8249-367ac618d4f1@s3g2000vbx.googlegroups.com>

On Sep 16, 10:29?am, Martin Sch??n <martin.sch... at gmail.com> wrote:
> On 2011-09-15, John Ladasky <lada... at my-deja.com> wrote:
>
> > Hate to bump this, but... I found Sourceforge's IRC, and tried to ask
> > for help there, and it doesn't look like I can get any help until
> > business hours tomorrow. ?Anyone?
>
> No help really but I 'joined' Sourceforge about a year ago and
> had no problems whatsoever.
>
> Could it be some anti-robot filter that's gotten overly picky?
>
> /Martin

Well, I got through to Sourceforge today, and succeeded in
subscribing.  A support person said that their site's registration web
page has compatibility issues with certain web browsers and/or their
extensions.  I was using Chrome.  They asked me to try another
browser, I tried Firefox, and it worked.

Personally, I find that to be pretty bizarre -- but it worked.


From ladasky at my-deja.com  Sat Sep 17 04:34:18 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 17 Sep 2011 01:34:18 -0700 (PDT)
Subject: multiprocessing.Pool, its queue, and pre-emption
References: <fd651232-6b8e-405e-af65-d663f0a73d50@t3g2000vbe.googlegroups.com>
	<cc4b4a8d-4fa9-4377-b0d1-7b1d25d23a7b@cd4g2000vbb.googlegroups.com>
Message-ID: <fa6acd70-c555-4033-a3b9-43c5730010af@j8g2000yqa.googlegroups.com>

Hey, this pretty easy hack appears to work!

[code]

from multiprocessing.pool import Pool, RUN, MapResult, mapstar

class PriorityPool(Pool):

    def map_async_nowait(self, func, iterable, chunksize=None, \
        callback=None):
        """
        Same as map_async(), except uses put_nowait() and
        thus posts tasks to the head of the task queue
        rather than its tail.
        """
        assert self._state == RUN
        if not hasattr(iterable, '__len__'):
            iterable = list(iterable)

        if chunksize is None:
            chunksize, extra = divmod(len(iterable), len(self._pool) *
4)
            if extra:
                chunksize += 1

        task_batches = Pool._get_tasks(func, iterable, chunksize)
        result = MapResult(self._cache, chunksize, len(iterable), \
            callback)
        self._taskqueue.put_nowait((((result._job, i, mapstar, (x,),
{}) \
            for i, x in enumerate(task_batches)), None))
        return result

    def size(self):
        """
        This is not an essential function, but I use it in the
        demo to ensure that I initially create enough tasks to
        occupy every Process.
        """
        return len(self._pool)

##================================================================##

if __name__ == "__main__":

    from time import sleep

    def demo_task(args):
        num, time = args
        sleep(time)
        print num, time

    pool = PriorityPool()
    size = pool.size()
    print "\nConstructed a pool which contains", size, "Processes."
    print "Queueing", 2*size, "normal-priority tasks."
    normal = enumerate([3.0 + t for t in range(2*size)])
    pool.map_async(demo_task, normal, chunksize = 1)
    print "Queueing", size, "high-priority tasks."
    high = [(2*size + t, 0.2 + 0.1*t) for t in range(size)]
    pool.map_async_nowait(demo_task, high, chunksize = 1)
    sleep(30) # Give all tasks on the queue time to complete.
    print "Complete."

[/code]

Below is a typical output from my six-core CPU system.  The output
differs slightly from run to run -- that's multiprocessing for you,
it's asynchronous.

The tasks are given numbers which correspond to the order that they
are added to the queue.  The high-priority tasks are added last and
are thus numbered 12-17 (I place asterisks next to these in the
output, below).  Each task prints its number and its time when it
completes.  I expect the normal-priority tasks 0-5 to finish before
any high-priority tasks, and they always do.  Tasks 6 and 7 are then
interleaved among the high-priority tasks -- not quite what I expect,
but that may have something to do with my rather arbitrary choices of
sleep times.  But tasks 8-11 always get pushed to the back, and
complete last.

[output]

Constructed a pool which contains 6 Processes.
Queueing 12 normal-priority tasks.
Queueing 6 high-priority tasks.
0 3.0
1 4.0
2 5.0
3 6.0
4 7.0
5 8.0
6 9.0
12 0.2 *
13 0.3 *
14 0.4 *
15 0.5 *
7 10.0
16 0.6 *
17 0.7 *
8 11.0
9 12.0
10 13.0
11 14.0

[/output]

Please feel free to use this, though I would appreciate an
acknowledgment in your code if you do.  :^)


From phihag at phihag.de  Sat Sep 17 07:19:01 2011
From: phihag at phihag.de (Philipp Hagemeister)
Date: Sat, 17 Sep 2011 13:19:01 +0200
Subject: Code Review
In-Reply-To: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>
References: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>
Message-ID: <4E748225.8020602@phihag.de>

Instead of comments, you can often use docstrings
(http://www.python.org/dev/peps/pep-0257/ ):

This is hard to read due to the indentation, and cannot be accessed
programmatically:

#Update the GUI
    def update_gui(self, new_word):

Instead, use this:

    def update_gui(self, new_word):
        "Update the GUI."

Now, you can use help(Message) to get information about the method.
You'll notice "Update the GUI." is not helpfull at all for a method
called update_gui. Comments (and docstrings) that reproduce the method
name are not useful.

A couple of minor things:

* If you delete code, delete it, don't comment it out.
* Use newlines between two methods. Compare
def a(self):
  pass
def b(self):
  pass
def c(self):
  pass

with

def a(self):
  pass

def b(self):
  pass

def c(self):
  pass

The latter looks neat and not nearly as crammed as the former.
* Don't use newlines where they shouldn't be, for example in
                if val == 0:

                      label.unbind('<Button-1>')
* Even if it's just the comments, typos make a very bad impression of a
coder and the code. I'd automatically assume lots of bugs and untested
code when I see more than the occasional typo.
* GUI programming is fun, but does not lend itself to structured
programming and good practices. You should never use global. Instead,
have an object encapsulating the state and pass that object to the
method itself or its object.
* Don't commit .pyc files, they're totally useless. Since python 2.6,
you can add the following in your .bashrc to make python not create them:

export "PYTHONDONTWRITEBYTECODE=dont"

In git, you can add the following in your project's .gitignore or
~/.gitignore_global:

*.pyc

[More on .gitignore: http://help.github.com/ignore-files/ ]
* Otherwise, the code looks pretty good for a beginner. You may,
however, want to replace

def word_not_found(word):
      if word in searchedwordset:
        return 0
      else:
        return 1

with just:

def word_not_found(word):
  return word not in searchedwordset

(or just skip this method and write word not in searchedwordset).

Cheers,

Philipp



Emeka wrote:
> Hello All,
> 
> While learning Python I put together another Text Twist. I would want
> somebody to go through it and comment.
> https://github.com/janus/Text-Twist
> 
> 


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From rafadurancastaneda at gmail.com  Sat Sep 17 07:56:25 2011
From: rafadurancastaneda at gmail.com (=?ISO-8859-1?Q?Rafael_Dur=E1n_Casta=F1eda?=)
Date: Sat, 17 Sep 2011 13:56:25 +0200
Subject: create a directory structure
In-Reply-To: <4E73566A.1010808@gmail.com>
References: <4E732F4B.3090409@gmail.com>
	<4E73566A.1010808@gmail.com>
Message-ID: <CAH+GN=1iMF_q2AYyG_7pOjoCc=4PpPBvb9N7tacfVum9JRDH7g@mail.gmail.com>

2011/9/16 Andrea Crotti <andrea.crotti.0 at gmail.com>

> After some research, I think that paste-script is the best choice in this
> case.
>
> I can define templates and I'll get my directory structure nicely populated
> for me.
>
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>
I think you might want to look at
Fabric<http://docs.fabfile.org/en/1.2.2/index.html>or
vagrant <http://vagrantup.com/>
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From emekamicro at gmail.com  Sat Sep 17 09:26:23 2011
From: emekamicro at gmail.com (Emeka)
Date: Sat, 17 Sep 2011 14:26:23 +0100
Subject: Code Review
In-Reply-To: <4E748225.8020602@phihag.de>
References: <CAOypoo7MgyQx0pWd9WRsvqwZBDcFQGBb5PqK890_chbRd8iV7g@mail.gmail.com>
	<4E748225.8020602@phihag.de>
Message-ID: <CAOypoo7xWWuyhMNdb-VhKmfH-Xm+-rO_h0o8fe_GqewUZkybfQ@mail.gmail.com>

Philipp,

Thanks so much for your time and comment. I will re-work my code
accordingly.

Regards,
Emeka

On Sat, Sep 17, 2011 at 12:19 PM, Philipp Hagemeister <phihag at phihag.de>wrote:

> Instead of comments, you can often use docstrings
> (http://www.python.org/dev/peps/pep-0257/ ):
>
> This is hard to read due to the indentation, and cannot be accessed
> programmatically:
>
> #Update the GUI
>    def update_gui(self, new_word):
>
> Instead, use this:
>
>    def update_gui(self, new_word):
>        "Update the GUI."
>
> Now, you can use help(Message) to get information about the method.
> You'll notice "Update the GUI." is not helpfull at all for a method
> called update_gui. Comments (and docstrings) that reproduce the method
> name are not useful.
>
> A couple of minor things:
>
> * If you delete code, delete it, don't comment it out.
> * Use newlines between two methods. Compare
> def a(self):
>  pass
> def b(self):
>  pass
> def c(self):
>  pass
>
> with
>
> def a(self):
>  pass
>
> def b(self):
>  pass
>
> def c(self):
>  pass
>
> The latter looks neat and not nearly as crammed as the former.
> * Don't use newlines where they shouldn't be, for example in
>                if val == 0:
>
>                      label.unbind('<Button-1>')
> * Even if it's just the comments, typos make a very bad impression of a
> coder and the code. I'd automatically assume lots of bugs and untested
> code when I see more than the occasional typo.
> * GUI programming is fun, but does not lend itself to structured
> programming and good practices. You should never use global. Instead,
> have an object encapsulating the state and pass that object to the
> method itself or its object.
> * Don't commit .pyc files, they're totally useless. Since python 2.6,
> you can add the following in your .bashrc to make python not create them:
>
> export "PYTHONDONTWRITEBYTECODE=dont"
>
> In git, you can add the following in your project's .gitignore or
> ~/.gitignore_global:
>
> *.pyc
>
> [More on .gitignore: http://help.github.com/ignore-files/ ]
> * Otherwise, the code looks pretty good for a beginner. You may,
> however, want to replace
>
> def word_not_found(word):
>      if word in searchedwordset:
>        return 0
>      else:
>        return 1
>
> with just:
>
> def word_not_found(word):
>  return word not in searchedwordset
>
> (or just skip this method and write word not in searchedwordset).
>
> Cheers,
>
> Philipp
>
>
>
> Emeka wrote:
> > Hello All,
> >
> > While learning Python I put together another Text Twist. I would want
> > somebody to go through it and comment.
> > https://github.com/janus/Text-Twist
> >
> >
>
>
>


-- 
*Satajanus  Nig. Ltd


*
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From brandonfigura at gmail.com  Sat Sep 17 09:58:27 2011
From: brandonfigura at gmail.com (Fig)
Date: Sat, 17 Sep 2011 06:58:27 -0700 (PDT)
Subject: strange results
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
	<c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
	<mailman.1231.1316242745.27778.python-list@python.org>
Message-ID: <c9690798-a7a5-4d90-aa12-10f825b26c7d@o9g2000vbo.googlegroups.com>

On Sep 17, 1:59?am, Alexander Kapps <alex.ka... at web.de> wrote:
> On 17.09.2011 01:09, Fig wrote:
>
> > I took out all of the color commands that were in the shape functions
> > and all of the features to the 'draw_house' function showed showed up.
> > I started putting the color commands back into the shape functions and
> > have no problems with some of them but when I put the color command
> > back into others, some of the features start to disappear. As far as I
> > can see, all of the code is right but I'm just a beginner so I am not
> > for sure. Can anyone tell me why this is doing what it is.
>
> Just tried your program on Ubuntu 10.04 with Python 2.6.5 and GASP
> 0.3.3 and it worked fine. What OS, Python version and GASP version
> are you using?
>
> If you don't get an answer here, try asking on the Launchpad project
> site:
>
> https://launchpad.net/gasp

My OS is Windows 7, Python 2.7.2, I downloaded and installed the
python-gasp-0.2.0beta1.win32.exe file, and I also have these
installed: Python 2.7 pygame-1.9.2a0 and Python 2.7 pywin32-216


From yasar11732 at gmail.com  Sat Sep 17 11:10:31 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Sat, 17 Sep 2011 18:10:31 +0300
Subject: Modifiying __getattribute__ of an instance
Message-ID: <CAFEUn8atTaFVASzk8z5THLOLZVjiJv66Kd0e25pgTo6dQpsmPA@mail.gmail.com>

I am trying to modify __getattribute__() method for an instance, as you may
already know,__getattirbute__ is read-only attribute in Python. What I have
in mind is, create a new object like this:

def create_new_instace(old_instance):
    class temp(old_instance.__class__):
        def __init__(self,*args,**kwargs):
            "Since we will copy an already inited instance"
            pass
        def __getattribute__(self,attr):
           # do stuff
    new_instance = temp()
    # magically copy all attrs of old_instance to new_instance
    return new_instance

Is this kind of thing possible?
-- 
http://yasar.serveblog.net/
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From as at sci.fi  Sat Sep 17 11:25:11 2011
From: as at sci.fi (Anssi Saari)
Date: Sat, 17 Sep 2011 18:25:11 +0300
Subject: strange results
References: <5bf9fb8e-6c46-4342-8eb3-a0b71fcb0205@k28g2000yqh.googlegroups.com>
	<c8ff55b4-faea-42fb-a3fc-8db4bc140cf9@h9g2000yqi.googlegroups.com>
	<mailman.1231.1316242745.27778.python-list@python.org>
	<c9690798-a7a5-4d90-aa12-10f825b26c7d@o9g2000vbo.googlegroups.com>
Message-ID: <vg3pqizi42v.fsf@coffee.modeemi.fi>

Fig <brandonfigura at gmail.com> writes:

> My OS is Windows 7, Python 2.7.2, I downloaded and installed the
> python-gasp-0.2.0beta1.win32.exe file, and I also have these
> installed: Python 2.7 pygame-1.9.2a0 and Python 2.7 pywin32-216

Then maybe that old beta version is your problem? For the record, your
code works for me too in Linux and python-gasp 0.3.3. 

Looks like there's no Windows installer for newer python-gasp. Maybe you
could install with easy_install as they describe on the site?


From missive at hotmail.com  Sat Sep 17 11:58:32 2011
From: missive at hotmail.com (Lee Harr)
Date: Sat, 17 Sep 2011 20:28:32 +0430
Subject: os independent rename
Message-ID: <SNT106-W65918A9483719408A59F5AB1090@phx.gbl>


I just got a bug report the heart of which is the
difference between unix and windows in using
os.rename

(ie, "On Windows, if dst already exists, OSError will be raised")

Hmm, I thought, maybe I'm supposed to use
shutil here. That is the "high-level" operations.
Unfortunately, shutil.move says it depends on
os.rename

So, what is the best way to do this that will
behave the same across operating systems?

 		 	   		  


From ian.g.kelly at gmail.com  Sat Sep 17 12:41:18 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 17 Sep 2011 10:41:18 -0600
Subject: os independent rename
In-Reply-To: <SNT106-W65918A9483719408A59F5AB1090@phx.gbl>
References: <SNT106-W65918A9483719408A59F5AB1090@phx.gbl>
Message-ID: <CALwzid=eg3cUd+eQULy6wNUyTshSVfhwor_yZrOm_sCam_gqag@mail.gmail.com>

On Sat, Sep 17, 2011 at 9:58 AM, Lee Harr <missive at hotmail.com> wrote:
>
> I just got a bug report the heart of which is the
> difference between unix and windows in using
> os.rename
>
> (ie, "On Windows, if dst already exists, OSError will be raised")
>
> Hmm, I thought, maybe I'm supposed to use
> shutil here. That is the "high-level" operations.
> Unfortunately, shutil.move says it depends on
> os.rename
>
> So, what is the best way to do this that will
> behave the same across operating systems?

shutil.move works for me, at least in Python 2.7.  The docstring
doesn't seem to match the code here:

    try:
        os.rename(src, real_dst)
    except OSError:
        if os.path.isdir(src):
            if _destinsrc(src, dst):
                raise Error, "Cannot move a directory '%s' into itself
'%s'." % (src, dst)
            copytree(src, real_dst, symlinks=True)
            rmtree(src)
        else:
            copy2(src, real_dst)
            os.unlink(src)


From invalid at invalid.invalid  Sat Sep 17 12:42:18 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 17 Sep 2011 16:42:18 +0000 (UTC)
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<CAJ6cK1b4Hyfc+x_fyuTEh0qTQ9v=6BqTQXPjQZ4VsUxuyoQ_xA@mail.gmail.com>
	<mailman.1215.1316206402.27778.python-list@python.org>
	<j51030$gie$1@reader1.panix.com>
	<mailman.1228.1316229690.27778.python-list@python.org>
Message-ID: <j52ila$d5h$1@reader1.panix.com>

On 2011-09-17, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Fri, Sep 16, 2011 at 8:19 PM, Grant Edwards <invalid at invalid.invalid> wrote:
>>> Here's another one-liner using a generator instead of map:
>>>
>>> ? ? ?sum(int(c) for c in str(2**1000))
>>
>> Just in case you can't spare the 3KB required for the list of integers
>> that map creates. :)
>>
>> In this case it doesn't matter, but it's not hard to find problems
>> where the difference between the memory requirements for a generator
>> and a map/list-comprehension are significant enough to worry about.
>
> Unless otherwise specified, I generally assume that code on this list
> is for Python 3, and map in Python 3 returns an iterator.

Indeed, I forgot about that (I'm still using Python 2 since I use some
libraries that haven't been ported).

-- 
Grant




From kw at codebykevin.com  Sat Sep 17 14:01:47 2011
From: kw at codebykevin.com (Kevin Walzer)
Date: Sat, 17 Sep 2011 14:01:47 -0400
Subject: Python bug in Windows 8--report now, or later?
Message-ID: <j52nab$bfc$1@dont-email.me>

I have been testing my Python application on the just-released developer 
preview of Windows 8 and have noted an error: the application does not 
create an app folder in the user's "application data" directory. This 
causes the app to crash on startup. Manually creating the directory 
solves the problem. Since the app uses an os.mkdir() call to create the 
directory, and since the app runs fine on Windows 7, my guess is that 
the bug lies somewhere in the interaction between Python (I'm using 
ActivePython 2.7) and Windows.

Here's the relevant code:

     #make preferences directory if it does not exist
     def makePrefsDir(self):
         self.appdir = os.path.join(os.path.join(os.environ['APPDATA'], 
'MyApp'))
         if not os.path.exists(self.appdir):
             os.mkdir(self.appdir)

I realize that this developer preview of Windows is still at somewhere 
between alpha- and beta-level, and it's possible things will get better. 
Should I wait to report this as a bug until Windows 8 is released, or do 
the Python developers test Python on pre-release versions of Windows?


From missive at hotmail.com  Sat Sep 17 14:40:02 2011
From: missive at hotmail.com (Lee Harr)
Date: Sat, 17 Sep 2011 23:10:02 +0430
Subject: os independent rename
Message-ID: <SNT106-W4986EA87740DAD686CC33AB1090@phx.gbl>


> shutil.move works for me, at least in Python 2.7.  The docstring> doesn't seem to match the code
Thanks for checking that.
Looks like there is a closed report about the misleading docs:http://bugs.python.org/issue12577
Closed a couple of months ago, but the docs have not madeit to the web yet....
 		 	   		  
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From shajiashish at gmail.com  Sat Sep 17 14:41:18 2011
From: shajiashish at gmail.com (Indian Entertainment)
Date: Sat, 17 Sep 2011 11:41:18 -0700 (PDT)
Subject: All Posters Com
Message-ID: <dc70c5c3-fa19-42f3-9ecc-14efd8e7dc8a@d12g2000vba.googlegroups.com>

With more than 1,000,000 images, AllPosters is your one-stop-shop for
wall art, providing a huge assortment of posters, art prints and other
items to suit all interests, decorating styles and budgets. Browse the
latest posters in music, movies, sports, and more. Find your favorite
art prints from the classic masters. Discover up-and-coming artists.
Explore our special collections. Then choose from a wide array of
custom-framing, canvas, wood-mounting and other service options to
truly make it your own ? all high quality and at amazing prices. Start
searching now and see for yourself how AllPosters is transforming the
way the world discovers and personalizes art. Check out the art we're
digging right now and what's on our gotta-hang-it list. We've narrowed
down the 1,000,000 options (and counting) on AllPosters.com to our
select favorites, including vintage posters, retro comics, Warhol
masterpieces and a samurai.

http://tinyurl.com/44skelw



From nobody at nowhere.com  Sat Sep 17 15:00:53 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 17 Sep 2011 20:00:53 +0100
Subject: Cancel or timeout a long running regular expression
References: <1316063960.26516.140258141338017@webmail.messagingengine.com>
	<mailman.1182.1316112919.27778.python-list@python.org>
	<pan.2011.09.16.13.57.05.761000@nowhere.com>
	<mailman.1221.1316210519.27778.python-list@python.org>
Message-ID: <pan.2011.09.17.19.00.55.828000@nowhere.com>

On Fri, 16 Sep 2011 18:01:27 -0400, Terry Reedy wrote:

> Now, can you write that as a heuristic *algorithm*
> def dangerous_re(some_re):?

	return re.search(r'\\\d', some_re) is not None

That will handle the most extreme case ;)

If the OP is serious about analysing regexps, sre_parse.parse() will
decompose a regexp to a more convenient form.

However, I wouldn't rely upon being able to catch every possible bad case.
The only robust solution is to use a separate process (threads won't
suffice, as they don't have a .kill() method).



From nobody at nowhere.com  Sat Sep 17 15:18:19 2011
From: nobody at nowhere.com (Nobody)
Date: Sat, 17 Sep 2011 20:18:19 +0100
Subject: os independent rename
References: <mailman.1236.1316275189.27778.python-list@python.org>
Message-ID: <pan.2011.09.17.19.18.21.518000@nowhere.com>

On Sat, 17 Sep 2011 20:28:32 +0430, Lee Harr wrote:

> So, what is the best way to do this that will
> behave the same across operating systems?

Delete the destination first, but after checking that it isn't the same as
the source.

On Windows, that last bit is harder than it seems. A string-based
comparison won't work. Even if you ignore case, there's the issue of 8.3
filenames, and some other odd cases.



From tjreedy at udel.edu  Sat Sep 17 17:19:26 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 17 Sep 2011 17:19:26 -0400
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j52nab$bfc$1@dont-email.me>
References: <j52nab$bfc$1@dont-email.me>
Message-ID: <j532t6$p50$1@dough.gmane.org>

On 9/17/2011 2:01 PM, Kevin Walzer wrote:
> I have been testing my Python application on the just-released developer
> preview of Windows 8 and have noted an error: the application does not
> create an app folder in the user's "application data" directory. This
> causes the app to crash on startup. Manually creating the directory
> solves the problem. Since the app uses an os.mkdir() call to create the
> directory, and since the app runs fine on Windows 7, my guess is that
> the bug lies somewhere in the interaction between Python (I'm using
> ActivePython 2.7) and Windows.

We need more that guesses to act. I think is premature to call this a 
'Python bug'.

> Here's the relevant code:
>
> #make preferences directory if it does not exist
> def makePrefsDir(self):
> self.appdir = os.path.join(os.path.join(os.environ['APPDATA'], 'MyApp'))
> if not os.path.exists(self.appdir):
> os.mkdir(self.appdir)
>
> I realize that this developer preview of Windows is still at somewhere
> between alpha- and beta-level, and it's possible things will get better.
> Should I wait to report this as a bug until Windows 8 is released, or do
> the Python developers test Python on pre-release versions of Windows?

3 days ago (Sept 14) someone asked about 'Windows 8 support' on pydev 
list. The answers were 1) 2.7 and 3.2 appear to run fine on the Dev 
release (but there was no report of test suite results); 2) Python 
directly uses so little of the Win interface that problems are not 
anticipated; 3) applications might have to make Win 8 specific 
adjustments and should test before the release.

Of course, if MS accidentally changes thinly wrapped system calls such 
as os.environ, .exists, and .makedir, there will be a problem but that 
is their bug. My impression is that they are not intentionally breaking 
such things.

I anticipate 3.3 and some future 2.7.z will be officially supported (and 
tested) on Win 8.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sat Sep 17 17:20:26 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 07:20:26 +1000
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j52nab$bfc$1@dont-email.me>
References: <j52nab$bfc$1@dont-email.me>
Message-ID: <CAPTjJmqhABsgGOSUsKKL6+wnF_sNyuOJ2VXi7j2nZzZMnUeeOA@mail.gmail.com>

On Sun, Sep 18, 2011 at 4:01 AM, Kevin Walzer <kw at codebykevin.com> wrote:
> I realize that this developer preview of Windows is still at somewhere
> between alpha- and beta-level, and it's possible things will get better.
> Should I wait to report this as a bug until Windows 8 is released, or do the
> Python developers test Python on pre-release versions of Windows?

I would consider reporting it as a bug in Windows 8, not a bug in Python.

Chris Angelico


From rosuav at gmail.com  Sat Sep 17 17:35:01 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 07:35:01 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
Message-ID: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>

On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:
> The only robust solution is to use a separate process (threads won't
> suffice, as they don't have a .kill() method).
>

Forking a thread to discuss threads.... ahem.

Why is it that threads can't be killed? Do Python threads correspond
to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
library I've seen has some way of killing threads, although I've not
looked in detail into POSIX threads there (there seem to be two
options, pthread_kill and pthread_cancel, that could be used, but I've
not used either). If nothing else, it ought to be possible to
implement a high level kill simply by setting a flag that the
interpreter will inspect every few commands, the same way that
KeyboardInterrupt is checked for.

Is it just that nobody's implemented it, or is there a good reason for
avoiding offering this sort of thing?

Chris Angelico


From clp2 at rebertia.com  Sat Sep 17 18:27:45 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 17 Sep 2011 15:27:45 -0700
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
Message-ID: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>

On Sat, Sep 17, 2011 at 2:35 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:
>> The only robust solution is to use a separate process (threads won't
>> suffice, as they don't have a .kill() method).
>
> Forking a thread to discuss threads.... ahem.
>
> Why is it that threads can't be killed? Do Python threads correspond
> to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
> library I've seen has some way of killing threads, although I've not
> looked in detail into POSIX threads there (there seem to be two
> options, pthread_kill and pthread_cancel, that could be used, but I've
> not used either). If nothing else, it ought to be possible to
> implement a high level kill simply by setting a flag that the
> interpreter will inspect every few commands, the same way that
> KeyboardInterrupt is checked for.
>
> Is it just that nobody's implemented it, or is there a good reason for
> avoiding offering this sort of thing?

It's possible that the reason is analogous to why Java has deprecated
its equivalent, Thread.stop():
http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

Cheers,
Chris


From rosuav at gmail.com  Sat Sep 17 19:19:46 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 09:19:46 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
Message-ID: <CAPTjJmpHJk6uwQwx7WxyHzjc7P=iFbnycgXAug-Jay6RQzEqGw@mail.gmail.com>

On Sun, Sep 18, 2011 at 8:27 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> It's possible that the reason is analogous to why Java has deprecated
> its equivalent, Thread.stop():
> http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

Interesting. The main argument against having a way to raise an
arbitrary exception in a different thread is that it gets around
Java's requirement to declare all exceptions that a routine might
throw - a requirement that Python doesn't have. So does that mean it'd
be reasonable to have a way to trigger a "TerminateThread" exception
(like SystemExit but for one thread) remotely? The above article
recommends polling a variable, but that's the exact sort of thing that
exceptions are meant to save you from doing.

ChrisA


From cs at zip.com.au  Sat Sep 17 19:23:38 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sun, 18 Sep 2011 09:23:38 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular expression)
In-Reply-To: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
References: <CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
Message-ID: <20110917232338.GA22838@cskk.homeip.net>

On 17Sep2011 15:27, Chris Rebert <clp2 at rebertia.com> wrote:
| On Sat, Sep 17, 2011 at 2:35 PM, Chris Angelico <rosuav at gmail.com> wrote:
| > On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:
| >> The only robust solution is to use a separate process (threads won't
| >> suffice, as they don't have a .kill() method).
| >
| > Forking a thread to discuss threads.... ahem.
| >
| > Why is it that threads can't be killed? Do Python threads correspond
| > to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
| > library I've seen has some way of killing threads, although I've not
| > looked in detail into POSIX threads there (there seem to be two
| > options, pthread_kill and pthread_cancel, that could be used, but I've
| > not used either). If nothing else, it ought to be possible to
| > implement a high level kill simply by setting a flag that the
| > interpreter will inspect every few commands, the same way that
| > KeyboardInterrupt is checked for.
| >
| > Is it just that nobody's implemented it, or is there a good reason for
| > avoiding offering this sort of thing?
| 
| It's possible that the reason is analogous to why Java has deprecated
| its equivalent, Thread.stop():
| http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

Interesting. A lot of that discussion concerns exceptions that the Java
app is unprepared for. Java's strong typing includes the throwable
exceptions, so that's a quite legitimate concern. The aborting mutex
regions thing is also very real. Conversely, Python can have unexpected
exceptions anywhere, anytime because it is not strongly typed in this
way. That doesn't make it magicly robust against this, but does mean
this is _already_ an issue in Python programs, threaded or otherwise.

Context managers can help a lot here, in that they offer a reliable
exception handler in a less ad hoc fashion than try/except because it
is tied to the locking object; but they won't magicly step in save
your basic:

  with my_lock:
    stuff...

Personally I'm of the view that thread stopping should be part of the
overt program logic, not a low level facility (such as causing a
ThreadDeath exception asynchronously). The latter has all the troubles
in the cited URL. Doing it overtly would go like this:

  ... outside ...
  that_thread.stop()    # sets the "stopping" flag on the thread object
  that_thread.join()    # and now maybe we wait for it...

  ... thread code ...
  ... do stuff, eg:
  with my_lock:
    muck about ...
  if thread.stopping:
    abort now, _outside_ the mutex
  ...

This avoids the issue of aborting in the middle of supposedly mutex-safe
code. It still requires scattering checks on thread.stopping through
library code such as the OP's rogue regexp evaluator.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

One measure of `programming complexity' is the number of mental objects you
have to keep in mind simultaneously in order to understand a program.  The
mental juggling act is one of the most difficult aspects of programming and
is the reason programming requires more concentration than other activities.
It is the reason programmers get upset about `quick interruptions' -- such
interruptions are tantamount to asking a juggler to keep three balls in the
air and hold your groceries at the same time.
        - Steve McConnell, _Code Complete_


From cs at zip.com.au  Sat Sep 17 19:27:54 2011
From: cs at zip.com.au (Cameron Simpson)
Date: Sun, 18 Sep 2011 09:27:54 +1000
Subject: os independent rename
In-Reply-To: <pan.2011.09.17.19.18.21.518000@nowhere.com>
References: <pan.2011.09.17.19.18.21.518000@nowhere.com>
Message-ID: <20110917232754.GA24525@cskk.homeip.net>

On 17Sep2011 20:18, Nobody <nobody at nowhere.com> wrote:
| On Sat, 17 Sep 2011 20:28:32 +0430, Lee Harr wrote:
| > So, what is the best way to do this that will
| > behave the same across operating systems?
| 
| Delete the destination first, but after checking that it isn't the same as
| the source.

This is usually a step that the UNIX os.rename is designed to avoid.
By deleting first, there is a window where the destination doesn't exist
at all. Also, if the subsequent rename fails, the destination is missing
long term. os.rename() on UNIX specifies that after the call either the
new items is at destination (success) or the old item is (failure).
Either way you still have a valid destination object.

So you're breaking the model that os.rename() strives explicitly to
provide.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Q: How many user support people does it take to change a light bulb?
A: We have an exact copy of the light bulb here and it seems to be
   working fine.  Can you tell me what kind of system you have?


From tjreedy at udel.edu  Sat Sep 17 19:30:31 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 17 Sep 2011 19:30:31 -0400
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmpHJk6uwQwx7WxyHzjc7P=iFbnycgXAug-Jay6RQzEqGw@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<CAMZYqRRKF8vivo132xrq3C-r8oJmuUdmoVZiXBMSf7K5XaO_eQ@mail.gmail.com>
	<CAPTjJmpHJk6uwQwx7WxyHzjc7P=iFbnycgXAug-Jay6RQzEqGw@mail.gmail.com>
Message-ID: <j53aiu$8b4$1@dough.gmane.org>

On 9/17/2011 7:19 PM, Chris Angelico wrote:
> On Sun, Sep 18, 2011 at 8:27 AM, Chris Rebert<clp2 at rebertia.com>  wrote:
>> It's possible that the reason is analogous to why Java has deprecated
>> its equivalent, Thread.stop():
>> http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html
>
> Interesting. The main argument against having a way to raise an
> arbitrary exception in a different thread is that it gets around
> Java's requirement to declare all exceptions that a routine might
> throw - a requirement that Python doesn't have.

I saw the main argument as being that stopping a thread at an arbitrary 
point can have an arbitrary, unpredictable effect on all other threads. 
And more so that shutting down an independent process.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sat Sep 17 19:38:05 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 18 Sep 2011 09:38:05 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <j53aag$7n8$1@dough.gmane.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
Message-ID: <CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>

On Sun, Sep 18, 2011 at 9:26 AM, Dennis Lee Bieber
<wlfraed at ix.netcom.com> wrote:
> def threadWork(lock, a1, a2, rate):
> ? ? ? ?while True:
> ? ? ? ? ? ? ? ?time.sleep(rate)
> ? ? ? ? ? ? ? ?lock.lock()
> ? ? ? ? ? ? ? ?t = a2.balance / 2
> ? ? ? ? ? ? ? ?a1.balance += t
> ? ? ? ? ? ? ? ?#say a thread.kill kills at this point
> ? ? ? ? ? ? ? ?a2.balance -= t
> ? ? ? ? ? ? ? ?lock.release()
>

It's obviously going to be an issue with killing processes too, which
is why database engines have so much code specifically to protect
against this. But if it's done as an exception, all you need is to
catch that exception and reraise it:

def threadWork(lock, a1, a2, rate):
   try:
       while True:
               time.sleep(rate)
               lock.lock()
               t = a2.balance / 2
               a1.balance += t
               #say a thread.kill kills at this point
               a2.balance -= t
               lock.release()
  except:
      # roll back the transaction in some way
      lock.release()
      raise

It'd require some care in coding, but it could be done. And if the
lock/transaction object can be coded for it, it could even be done
automatically:

def threadWork(lock, a1, a2, rate):
       while True:
               time.sleep(rate)
               transaction.begin()
               t = a2.balance / 2
               transaction.apply(a1.balance,t)
               #say a thread.kill kills at this point
               transaction.apply(a2.balance,-t)
               transaction.commit()

If the transaction object doesn't get its commit() called, it does no
actions at all, thus eliminating all issues of locks.

Obviously there won't be any problem with the Python interpreter
itself (refcounts etc) if the kill is done by exception - that would
be a potential risk if using OS-level kills.

ChrisA


From python at mrabarnett.plus.com  Sat Sep 17 19:52:15 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 18 Sep 2011 00:52:15 +0100
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <j53aag$7n8$1@dough.gmane.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
Message-ID: <4E7532AF.8000707@mrabarnett.plus.com>

On 18/09/2011 00:26, Dennis Lee Bieber wrote:
> On Sun, 18 Sep 2011 07:35:01 +1000, Chris Angelico<rosuav at gmail.com>
> declaimed the following in gmane.comp.python.general:
>
>> Is it just that nobody's implemented it, or is there a good reason for
>> avoiding offering this sort of thing?
>>
> 	Any asynchronous "kill" runs the risk of leaving shared data
> structures in a corrupt state. {Stupid example, but, in pseudo-Python:
>
> import time
>
> class Account(object):
> 	def __init__(self, initial=0.0)
> 		self.balance = initial
>
> myAccount = Account(100.0)
> yourAccount = Account(100.0)
>
> accountLock = threading.Lock()
>
> def threadWork(lock, a1, a2, rate):
> 	while True:
> 		time.sleep(rate)
> 		lock.lock()
> 		t = a2.balance / 2
> 		a1.balance += t
> 		#say a thread.kill kills at this point
> 		a2.balance -= t
> 		lock.release()
>
> # create/start thread1 passing (accountLock, myAccount, yourAccount, 60)
> # create/start thread2 passing (accountLock, yourAccount, myAccount,
> 120)
>
> time.sleep(300)
> thread1.kill()
>
> 	So... Thread1 may be killed after one account gets incremented but
> before the other is decremented... And what happens to the lock? If it
> doesn't get released as part of the .kill() processing, they program is
> dead-locked (and the magically appearing money will never be seen). If
> it does get released, then the sum total of "money" in the system will
> have increased.
>
[snip]
The lock won't be released if an exception is raised, for example, if
'a1' isn't an Account instance and has no 'balance' attribute. Using a
context manager would help in that case.


From davea at ieee.org  Sat Sep 17 20:04:42 2011
From: davea at ieee.org (Dave Angel)
Date: Sat, 17 Sep 2011 20:04:42 -0400
Subject: os independent rename
In-Reply-To: <pan.2011.09.17.19.18.21.518000@nowhere.com>
References: <mailman.1236.1316275189.27778.python-list@python.org>
	<pan.2011.09.17.19.18.21.518000@nowhere.com>
Message-ID: <4E75359A.6060907@ieee.org>

On 01/-10/-28163 02:59 PM, Nobody wrote:
> On Sat, 17 Sep 2011 20:28:32 +0430, Lee Harr wrote:
>
>> So, what is the best way to do this that will
>> behave the same across operating systems?
> Delete the destination first, but after checking that it isn't the same as
> the source.
>
> On Windows, that last bit is harder than it seems. A string-based
> comparison won't work. Even if you ignore case, there's the issue of 8.3
> filenames, and some other odd cases.
>
>
Or rename it twice, with the intermediate file being something that does 
not exist.  For example, generate a random name, and if it exists, 
repeat till you come up with one that does not.  Once the first rename 
has succeeded, you can safely delete the destination.

Even this approach can have problems in the face of symlinks or multiple 
partitions.

DaveA



From missive at hotmail.com  Sat Sep 17 20:41:33 2011
From: missive at hotmail.com (Lee Harr)
Date: Sun, 18 Sep 2011 05:11:33 +0430
Subject: tool to point out os dependence problems?
Message-ID: <SNT106-W481FA47C49D828F61721BFB1080@phx.gbl>


One thing that I've always liked about python is that itmakes it?pretty easy to write programs that run acrossoperating?systems.
After running in to a problem today with os.renameI am wondering if there is a tool out there that canpoint out any known os dependence issues.
A quick trip to google shows nothing obvious.
 		 	   		  


From ladasky at my-deja.com  Sat Sep 17 23:06:27 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 17 Sep 2011 20:06:27 -0700 (PDT)
Subject: Python bug in Windows 8--report now, or later?
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
Message-ID: <49c99fa3-d0e0-4acb-b6fa-68959bbca52f@o9g2000vbo.googlegroups.com>

On Sep 17, 2:20?pm, Chris Angelico <ros... at gmail.com> wrote:

> I would consider reporting it as a bug in Windows 8, not a bug in Python.
>
> Chris Angelico

+1, beat me to it.  :^)


From invalid at invalid.invalid  Sun Sep 18 00:15:57 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Sun, 18 Sep 2011 04:15:57 +0000 (UTC)
Subject: Python bug in Windows 8--report now, or later?
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
Message-ID: <j53r9t$6v8$1@reader1.panix.com>

On 2011-09-17, Chris Angelico <rosuav at gmail.com> wrote:

> I would consider reporting it as a bug in Windows 8, not a bug in <whatever>

Good luck with that plan.  ;)

[I don't know anything about this particular issue, but I do know that
when there is a bug in Windows, it's usually everyboyd else that has
to change to work around it.]




From anikom15 at gmail.com  Sun Sep 18 00:40:32 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Sat, 17 Sep 2011 21:40:32 -0700
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j53r9t$6v8$1@reader1.panix.com>
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
	<j53r9t$6v8$1@reader1.panix.com>
Message-ID: <20110918044032.GA17257@Smoke>

On Sun, Sep 18, 2011 at 04:15:57AM +0000, Grant Edwards wrote:
> On 2011-09-17, Chris Angelico <rosuav at gmail.com> wrote:
> 
> > I would consider reporting it as a bug in Windows 8, not a bug in <whatever>
> 
> Good luck with that plan.  ;)
> 
> [I don't know anything about this particular issue, but I do know that
> when there is a bug in Windows, it's usually everyboyd else that has
> to change to work around it.]
> 
>

Actually Microsoft usually goes out of its way to ensure backwards-
compatibily, even when the app developer is DOING IT WRONG.


From alec.taylor6 at gmail.com  Sun Sep 18 01:42:00 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sun, 18 Sep 2011 15:42:00 +1000
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <20110918044032.GA17257@Smoke>
References: <j52nab$bfc$1@dont-email.me>
	<mailman.1241.1316294430.27778.python-list@python.org>
	<j53r9t$6v8$1@reader1.panix.com> <20110918044032.GA17257@Smoke>
Message-ID: <CAO+9iGfQpBnnvpvai7jqvOGnM0OTdLGxAQ9x5hnL9gy+pyQsCA@mail.gmail.com>

On Sun, Sep 18, 2011 at 2:40 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> On Sun, Sep 18, 2011 at 04:15:57AM +0000, Grant Edwards wrote:
>> On 2011-09-17, Chris Angelico <rosuav at gmail.com> wrote:
>>
>> > I would consider reporting it as a bug in Windows 8, not a bug in <whatever>
>>
>> Good luck with that plan. ?;)
>>
>> [I don't know anything about this particular issue, but I do know that
>> when there is a bug in Windows, it's usually everyboyd else that has
>> to change to work around it.]
>>
>>
>
> Actually Microsoft usually goes out of its way to ensure backwards-
> compatibily, even when the app developer is DOING IT WRONG.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

For those interested, Windows 8 is available here:
http://msdn.microsoft.com/windows/apps/br229516/


From dreyemi at gmail.com  Sun Sep 18 05:39:03 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 10:39:03 +0100
Subject: Getting a list value from key/value pair
Message-ID: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>

Hi all,

If I have a list with key/value pair, how do I get the value of the key?

I'm working with this code snippet:

>>> items = {'fees':[('status','pending'), ('timeout',60)],
'hostel':[('status',
 'pending'), ('timeout','120')]}
>>> print [items[i] for i in items.keys()]
[[('status', 'pending'), ('timeout', '120')], [('status', 'pending'),
('timeout'
, 60)]]
>>>

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From r32813 at freescale.com  Sun Sep 18 05:41:30 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Sun, 18 Sep 2011 09:41:30 +0000
Subject: Python 2.7.1 64-bit Build on HP-UX11.31 ia64 with aCC - Many
	modules failed to build
In-Reply-To: <mailman.0.1316338420.1409.python-list@python.org>
References: <mailman.0.1316338420.1409.python-list@python.org>
Message-ID: <02EA6D704E30CE499C5071776509A925F52AAB@039-SN1MPN1-003.039d.mgd.msft.net>

Hello there,

I have posted this in Compiler SIG and re-post here in case anyone who knows about this issue is not subscribed to that group. 

I am working on python build on my server using HP-UX ANSI C Compiler. I want to be consistent using aCC throughout instead of gcc for my python and cx_Oracle build as Oracle is not supporting gcc build much. Here is my aCC version.

# swlist -l product | grep Compiler
  ACXX                  C.06.26.EVAL   HP C/aC++ Compiler
  C-ANSI-C              C.06.26.EVAL   HP C/aC++ Compiler
  COMPLIBS              B.11.31        Compiler Support Libraries

Anyhow, my issue now is when I am building my python in 64-bit, I am encountering many modules failed to build issue, despite the python executable is successfully built. There are just so many modules that failed, that I would conclude my build failed. :P

I followed through the instruction in README file for 64-bit build using HP-UX compiler (--without-gcc option is used in configure). I exported and unexported the environment variables before configure and make is run, respectively. I also removed -O option in the Makefile before running make.

I have a few questions.

1.) Why Makefile is re-generated after python executable is created? I noticed the removal of optimization flag in Makefile is gone/restored after python binary is generated.

2.) 64-bit option. It seems that this is a bad flag that linker doesn't recognize? Many important modules failed to build, and I believe its due to this error. When I manually execute ld without passing in +DD64 flag, the module is generated successfull.


ld -b +DD64 -lxnet build/temp.hp-ux-B.11.31-ia64-2.7/home/r32813/Build/2.7.1/Python-2.7.1/Modules/mathmodule.o build/temp.hp-ux-B.11.31-ia64-2.7/home/r32813/Build/2.7.1/Python-2.7.1/Modules/_math.o -L/usr/local/lib -lm -o build/lib.hp-ux-B.11.31-ia64-2.7/math.so
ld: Unrecognized argument: +DD64
Fatal error.

Above is just showing one of the modules that failed to build.

3.) Built in modules, I see the compiler cannot find the bit of information required to build _tkinter module. How do I make the configure able to locate my tcl/tk source code or binary which I have already installed and built separately (and successfully)? So, where do I place the source code if I need to put it so that the compiler can find?

To end my question, here is the outcome of my build. For build in modules, I just need my _tkinter running. For shared libraries, I think  need most of them, those are the basic functions that my application calls.

Thanks in advance for your reply.

Python build finished, but the necessary bits to build these modules were not found:
_bsddb             _curses            _curses_panel  
_sqlite3           _ssl               _tkinter       
bsddb185           bz2                dl             
gdbm               imageop            linuxaudiodev  
ossaudiodev        readline           spwd           
sunaudiodev        zlib                              
To find the necessary bits, look in setup.py in detect_modules() for the module's name.


Failed to build these modules:
_bisect            _codecs_cn         _codecs_hk     
_codecs_iso2022    _codecs_jp         _codecs_kr     
_codecs_tw         _collections       _csv           
_ctypes            _ctypes_test       _elementtree   
_functools         _heapq             _hotshot       
_io                _json              _locale        
_lsprof            _md5               _multibytecodec
_multiprocessing   _random            _sha           
_socket            _struct            _testcapi      
array              audioop            binascii       
cmath              cPickle            crypt          
cStringIO          datetime           dbm            
fcntl              future_builtins    grp            
itertools          math               mmap           
nis                operator           parser         
pyexpat            resource           select         
strop              syslog             termios        
time               unicodedata              




From t at jollybox.de  Sun Sep 18 06:16:09 2011
From: t at jollybox.de (Thomas Jollans)
Date: Sun, 18 Sep 2011 12:16:09 +0200
Subject: Getting a list value from key/value pair
In-Reply-To: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
Message-ID: <4E75C4E9.60209@jollybox.de>

On 18/09/11 11:39, Kayode Odeyemi wrote:
> Hi all,
> 
> If I have a list with key/value pair, how do I get the value of the key?
> 
> I'm working with this code snippet:

Python 3.2.2 (default, Sep  5 2011, 04:33:58)
[GCC 4.6.1 20110819 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> lst = [ ('key1', 'value1'), ('key2', 'value2') ]
>>> d = dict (lst)
>>> d['key1']
'value1'
>>>


> 
>>>> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>>>> print [items[i] for i in items.keys()]
> [[('status', 'pending'), ('timeout', '120')], [('status', 'pending'),
> ('timeout'
> , 60)]]
>>>>
> 
> -- 
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
> 
> 
> 



From vincent.vandevyvre at swing.be  Sun Sep 18 06:22:00 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sun, 18 Sep 2011 12:22:00 +0200
Subject: Getting a list value from key/value pair
In-Reply-To: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
Message-ID: <4E75C648.7070000@swing.be>

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From vincent.vandevyvre at swing.be  Sun Sep 18 06:25:41 2011
From: vincent.vandevyvre at swing.be (Vincent Vande Vyvre)
Date: Sun, 18 Sep 2011 12:25:41 +0200
Subject: Getting a list value from key/value pair
In-Reply-To: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
Message-ID: <4E75C725.2050903@swing.be>

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From dreyemi at gmail.com  Sun Sep 18 06:30:06 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 11:30:06 +0100
Subject: Getting a list value from key/value pair
In-Reply-To: <4E75C648.7070000@swing.be>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
	<4E75C648.7070000@swing.be>
Message-ID: <CAPbrmCsiN7KNOS=DB=uGtBxzmTtE6xVF=pqKz1yLVGvQuQKDzA@mail.gmail.com>

On Sun, Sep 18, 2011 at 11:22 AM, Vincent Vande Vyvre <
vincent.vandevyvre at swing.be> wrote:

> **
> Le 18/09/11 11:39, Kayode Odeyemi a ?crit :
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> Like that:
>
> # -*- coding: utf-8 -*-
>
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> for key, value in items.iteritems():
>     print "\n {0}".format(key)
>     for val in value:
>         print "\t{0}:  {1}".format(val[0], val[1])
>
> for python 2.x
>

Thank you very much :)


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From andrea.crotti.0 at gmail.com  Sun Sep 18 06:44:59 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Sun, 18 Sep 2011 11:44:59 +0100
Subject: create a directory structure
In-Reply-To: <CAH+GN=1iMF_q2AYyG_7pOjoCc=4PpPBvb9N7tacfVum9JRDH7g@mail.gmail.com>
References: <4E732F4B.3090409@gmail.com> <4E73566A.1010808@gmail.com>
	<CAH+GN=1iMF_q2AYyG_7pOjoCc=4PpPBvb9N7tacfVum9JRDH7g@mail.gmail.com>
Message-ID: <4E75CBAB.6060204@gmail.com>

On 09/17/2011 12:56 PM, Rafael Dur?n Casta?eda wrote:
> I think you might want to look at Fabric 
> <http://docs.fabfile.org/en/1.2.2/index.html> or vagrant 
> <http://vagrantup.com/>
>
>

Thanks, but I don't understand how these two project would help me...
I don't need to deploy on many machines via ssh, I only need that each 
machine is able to create an initial infrastructure.

Paste-script allows me to do that, and in plus is ready to do many other 
things.
Doing it in a hand-made fashion might also work well, but I think using 
paste-script is better for future extensions/improvements.
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From dreyemi at gmail.com  Sun Sep 18 06:50:53 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 11:50:53 +0100
Subject: Getting a list value from key/value pair
In-Reply-To: <4E75C725.2050903@swing.be>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
	<4E75C725.2050903@swing.be>
Message-ID: <CAPbrmCuqgY=VPEUo_fO=sNxzuQ7QKaLmrwxFJz=HUkUbhrpzTA@mail.gmail.com>

On Sun, Sep 18, 2011 at 11:25 AM, Vincent Vande Vyvre <
vincent.vandevyvre at swing.be> wrote:

> **
> Le 18/09/11 11:39, Kayode Odeyemi a ?crit :
>
> Hi all,
>
>
> If I have a list with key/value pair, how do I get the value of the key?
>
>
> I'm working with this code snippet:
>
> >>> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
> >>> print [items[i] for i in items.keys()]
> [[('status', 'pending'), ('timeout', '120')], [('status', 'pending'),
> ('timeout'
> , 60)]]
> >>>
>
> --
> Odeyemi 'Kayode O.
> http://www.sinati.com. t: @charyorde
>
>  Sorry, for python3.x
>
> # -*- coding: utf-8 -*-
>
>
> d = {'fees':[('status','pending'), ('timeout',60)], 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> for key, value in d.items():
>
>     print("\n {0}".format(key))
>     for val in value:
>         print("\t{0}:  {1}".format(val[0], val[1]))
>
> Very helpful! I gave your karma at
http://stackoverflow.com/questions/7460675/getting-a-list-value-from-key-value-pair

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From dickinsm at gmail.com  Sun Sep 18 08:13:03 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 18 Sep 2011 05:13:03 -0700 (PDT)
Subject: way to calculate 2**1000 without expanding it?
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<mailman.1213.1316204268.27778.python-list@python.org>
Message-ID: <4be23f78-5eea-44db-b659-6bd8f7ab3752@15g2000vbb.googlegroups.com>

On Sep 16, 9:17?pm, Arnaud Delobelle <arno... at gmail.com> wrote:
> Ah go on, let's make a codegolf contest out of it.
> My entry:
>
> >>> sum(map(int,str(2**1000)))

You could save another character by replacing "2**1000" with "2<<999"

--
Mark


From dreyemi at gmail.com  Sun Sep 18 08:44:50 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Sun, 18 Sep 2011 13:44:50 +0100
Subject: Getting a list value from key/value pair
In-Reply-To: <4E75C648.7070000@swing.be>
References: <CAPbrmCsoavnWQt0m8q7C1f0c0+JQ8pDoRCqoh7i18PX4BFbnmA@mail.gmail.com>
	<4E75C648.7070000@swing.be>
Message-ID: <CAPbrmCvhun2AmaAKCTtJbr335Dc1weQFTAJzZrDZ8XkpVBpbfw@mail.gmail.com>

On Sun, Sep 18, 2011 at 11:22 AM, Vincent Vande Vyvre <
vincent.vandevyvre at swing.be> wrote:

> **
> Le 18/09/11 11:39, Kayode Odeyemi a ?crit :
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> Like that:
>
> # -*- coding: utf-8 -*-
>
>
> items = {'fees':[('status','pending'), ('timeout',60)],
> 'hostel':[('status',
>  'pending'), ('timeout','120')]}
>
> for key, value in items.iteritems():
>     print "\n {0}".format(key)
>     for val in value:
>         print "\t{0}:  {1}".format(val[0], val[1])
>
> for python 2.x
>

Vincent, with:

values =  ('status', 'pending') ('timeout', '120') ('status', 'pending')
('timeout', 60)

How do I comma separate it and put each each item in a dict?

>>> for key, value in items.iteritems():
...     for val in value:
...             md = {}
...             for q in val:
...                     md.update(q)
...                     print md
...
Traceback (most recent call last):
  File "<stdin>", line 5, in <module>
ValueError: dictionary update sequence element #0 has length 1; 2 is
required

Thank you

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From python at bdurham.com  Sun Sep 18 09:50:40 2011
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 18 Sep 2011 09:50:40 -0400
Subject: Cancel or timeout a long running regular expression
In-Reply-To: <pan.2011.09.17.19.00.55.828000@nowhere.com>
References: <1316063960.26516.140258141338017@webmail.messagingengine.com><mailman.1182.1316112919.27778.python-list@python.org><pan.2011.09.16.13.57.05.761000@nowhere.com><mailman.1221.1316210519.27778.python-list@python.org>
	<pan.2011.09.17.19.00.55.828000@nowhere.com>
Message-ID: <1316353840.13565.140258142485365@webmail.messagingengine.com>

Thanks for everyone's comments - much appreciated!

Malcolm (the OP)


From arnodel at gmail.com  Sun Sep 18 10:10:10 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sun, 18 Sep 2011 15:10:10 +0100
Subject: way to calculate 2**1000 without expanding it?
In-Reply-To: <4be23f78-5eea-44db-b659-6bd8f7ab3752@15g2000vbb.googlegroups.com>
References: <33160283.436.1316200866800.JavaMail.geo-discussion-forums@prgd31>
	<CALwzidk1JOz0Xd-AMbMORgXbY6EN5Av6TrUhxHsje7cmCynJfA@mail.gmail.com>
	<mailman.1213.1316204268.27778.python-list@python.org>
	<4be23f78-5eea-44db-b659-6bd8f7ab3752@15g2000vbb.googlegroups.com>
Message-ID: <CAJ6cK1YrR3hhctrZRj0gdNNMUUA77T64vxp01PtN7qinRyXMKg@mail.gmail.com>

On Sep 18, 2011 1:20 PM, "Mark Dickinson" <dickinsm at gmail.com> wrote:
>
> On Sep 16, 9:17 pm, Arnaud Delobelle <arno... at gmail.com> wrote:
> > Ah go on, let's make a codegolf contest out of it.
> > My entry:
> >
> > >>> sum(map(int,str(2**1000)))
>
> You could save another character by replacing "2**1000" with "2<<999"
>

Excellent!

-- 
Arnaud
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From anbumani923 at gmail.com  Sun Sep 18 10:30:34 2011
From: anbumani923 at gmail.com (anbu)
Date: Sun, 18 Sep 2011 07:30:34 -0700 (PDT)
Subject: 2011 NEW MODAL  GIRLS SEX VIDEO AND PICTURES FREE DOWNLOAD
Message-ID: <c6249206-6c58-4ead-b4dd-dbc66cac9e1c@d12g2000vba.googlegroups.com>

http://123maza.com/65/cute540/


From zdoor at xs4all.nl  Sun Sep 18 11:55:08 2011
From: zdoor at xs4all.nl (Alex van der Spek)
Date: Sun, 18 Sep 2011 17:55:08 +0200
Subject: Numpy.array with dtype works on list of tuples not on list of lists?
Message-ID: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>

Why does this not work?

>>> dat=[[1,2,3],[4,5,6]]
>>> col=[('a','f4'),('b','f4'),('c','f4')]
>>> arr=numpy.array(dat,dtype=col)

Traceback (most recent call last):
  File "<pyshell#91>", line 1, in <module>
    arr=numpy.array(dat,dtype=col)
TypeError: expected a readable buffer object
>>> 

But this does:

>>> dat=[(1,2,3),(4,5,6)]
>>> arr=numpy.array(dat,dtype=col)
>>> arr
array([(1.0, 2.0, 3.0), (4.0, 5.0, 6.0)], 
      dtype=[('a', '<f4'), ('b', '<f4'), ('c', '<f4')])
>>> 

The only difference that the object is a list of tuples now?

Thanks for clarification,
Alex van der Spek




From rosuav at gmail.com  Sun Sep 18 13:55:16 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 19 Sep 2011 03:55:16 +1000
Subject: GTK2.TextView examples
In-Reply-To: <1316367199.2789.YahooMailRC@web83811.mail.sp1.yahoo.com>
References: <1316367199.2789.YahooMailRC@web83811.mail.sp1.yahoo.com>
Message-ID: <CAPTjJmr9s3AsqqiUa=tvew4pEK8ZqHgOMvm9T4niqu7s0s-FJg@mail.gmail.com>

On Mon, Sep 19, 2011 at 3:33 AM, Lance Dillon <riffraff169 at yahoo.com> wrote:
> Here are some examples that use GTK2.TextTag.

Interestingly, neither runs on my Windows system - I don't have GDK2
or Pango. Much appreciate the examples though - can some of them go
into the official docs?

It may well be that I'm using completely the wrong tools here. What I
want to do is write a console in Pike, more or less a telnet/MUD
client. Is it better to use TextView, or to use a GdkDisplay or
somesuch and draw the text myself?

ChrisA


From philip at semanchuk.com  Sun Sep 18 13:57:10 2011
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 18 Sep 2011 13:57:10 -0400
Subject: Numpy.array with dtype works on list of tuples not on list of
	lists?
In-Reply-To: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
References: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
Message-ID: <119665A7-EF5F-49D4-9B59-83C8D21EEA8A@semanchuk.com>


On Sep 18, 2011, at 11:55 AM, Alex van der Spek wrote:

> Why does this not work?
> 
>>>> dat=[[1,2,3],[4,5,6]]
>>>> col=[('a','f4'),('b','f4'),('c','f4')]
>>>> arr=numpy.array(dat,dtype=col)
> 
> Traceback (most recent call last):
> File "<pyshell#91>", line 1, in <module>
>   arr=numpy.array(dat,dtype=col)
> TypeError: expected a readable buffer object
> 
> But this does:
> 
>>>> dat=[(1,2,3),(4,5,6)]
>>>> arr=numpy.array(dat,dtype=col)
>>>> arr
> array([(1.0, 2.0, 3.0), (4.0, 5.0, 6.0)],      dtype=[('a', '<f4'), ('b', '<f4'), ('c', '<f4')])
> 
> The only difference that the object is a list of tuples now?

I don't know why you're seeing what you're seeing, but if you don't get answer here you could try asking on the numpy list. 

Good luck
Philip



From matt.pounsett at gmail.com  Sun Sep 18 16:19:24 2011
From: matt.pounsett at gmail.com (Matthew Pounsett)
Date: Sun, 18 Sep 2011 13:19:24 -0700 (PDT)
Subject: cause __init__ to return a different class?
References: <adb01223-f927-4a3d-aa3a-28b26dbaacc8@glegroupsg2000goo.googlegroups.com>
	<CAMZYqRQ494naCAiFs1Uy3FfktHAOKWsXbmoi4e0UTkhu6dGg0w@mail.gmail.com>
	<mailman.1152.1316066053.27778.python-list@python.org>
Message-ID: <731ee8c8-3f8d-49ad-91a9-4e247f66d252@bl1g2000vbb.googlegroups.com>

On Sep 15, 1:54?am, Ryan Kelly <r... at rfk.id.au> wrote:
> To be friendlier to others reading your code, I would consider using a
> classmethod to create an alternative constructor:

I finally got back to looking at this today.  As it turns out, un-
overriding __new__ in the child class is more complicated than I first
expected, and isn't worth the extra effort.  So, I ended up using a
constructor class method as you suggested.

Thanks again!


From robert.kern at gmail.com  Sun Sep 18 16:31:58 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Sun, 18 Sep 2011 15:31:58 -0500
Subject: Numpy.array with dtype works on list of tuples not on list of
	lists?
In-Reply-To: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
References: <4e761461$0$2418$e4fe514c@news2.news.xs4all.nl>
Message-ID: <j55kfu$rnh$1@dough.gmane.org>

On 9/18/11 10:55 AM, Alex van der Spek wrote:
> Why does this not work?
>
>>>> dat=[[1,2,3],[4,5,6]]
>>>> col=[('a','f4'),('b','f4'),('c','f4')]
>>>> arr=numpy.array(dat,dtype=col)
>
> Traceback (most recent call last):
> File "<pyshell#91>", line 1, in <module>
> arr=numpy.array(dat,dtype=col)
> TypeError: expected a readable buffer object
>>>>
>
> But this does:
>
>>>> dat=[(1,2,3),(4,5,6)]
>>>> arr=numpy.array(dat,dtype=col)
>>>> arr
> array([(1.0, 2.0, 3.0), (4.0, 5.0, 6.0)], dtype=[('a', '<f4'), ('b', '<f4'),
> ('c', '<f4')])
>>>>
>
> The only difference that the object is a list of tuples now?

numpy questions are best asked on the numpy mailing list:

   http://www.scipy.org/Mailing_Lists

To answer your question, though, numpy.array() needs to figure out a lot of 
different things about the input data simultaneously, in particular its shape. 
Structured arrays (i.e. with elements that have individual fields as above) pose 
a new problem in that its individual elements are sequences themselves. In order 
to help it decide whether it should recurse down into a sequence to find its 
elements or decide that the sequence *is* an element in its own right, we 
settled on the convention that tuples are to be considered elements and that 
lists are sequences of elements.

-- 
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 keymint1498 at gmail.com  Sun Sep 18 17:07:22 2011
From: keymint1498 at gmail.com (superhappyfuntime)
Date: 18 Sep 2011 21:07:22 GMT
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
	<38d9k8-u8t.ln1@satorlaser.homedns.org>
Message-ID: <nemo-18092011170700@nemo.com>

On 09-15-2011, Ulrich Eckhardt <ulrich.eckhardt at dominolaser.com> wrote:

> superhappyfuntime wrote:
>>  #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.

> It's LaTeX, not Python.

> Uli

no, it's a cap for LaTeX written in python


-- 
I'm trying a new usenet client for Mac, Nemo OS X, since 0 days.
You can download it at http://www.malcom-mac.com/nemo


From resourts137 at gmail.com  Sun Sep 18 17:54:25 2011
From: resourts137 at gmail.com (iqbal iqbal)
Date: Sun, 18 Sep 2011 14:54:25 -0700 (PDT)
Subject: Booking cheapest airlines Tickets Pakistan world wide
Message-ID: <ab413f46-2405-4ba9-9bcb-f6ec43c78c19@s16g2000yqc.googlegroups.com>

Booking cheapest airlines Tickets Pakistan world wide
http://karachi-guest-house-5star-hotels.blogspot.com/


From steve+comp.lang.python at pearwood.info  Sun Sep 18 18:00:51 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 18 Sep 2011 22:00:51 GMT
Subject: What is wrong with this code?
References: <nemo-15092011085110@nemo.com>
	<38d9k8-u8t.ln1@satorlaser.homedns.org> <nemo-18092011170700@nemo.com>
Message-ID: <4e766a13$0$29995$c3e8da3$5496439d@news.astraweb.com>

On Sun, 18 Sep 2011 21:07:22 +0000, superhappyfuntime wrote:

> On 09-15-2011, Ulrich Eckhardt <ulrich.eckhardt at dominolaser.com> wrote:
> 
>> superhappyfuntime wrote:
>>>  #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.
> 
>> It's LaTeX, not Python.
> 
>> Uli
> 
> no, it's a cap for LaTeX written in python

If it's Python, it's no Python syntax I've ever seen before.


>>> here it is: = '\begin{document}'
  File "<stdin>", line 1
    here it is: = '\begin{document}'
          ^
SyntaxError: invalid syntax


How about if you start off by explaining what you think "a cap for LaTeX" 
means, or provide a link to something that will explain it? This is a 
Python list, and we don't necessarily know much about LaTeX.



-- 
Steven



From irmen.NOSPAM at xs4all.nl  Sun Sep 18 19:05:20 2011
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Mon, 19 Sep 2011 01:05:20 +0200
Subject: ANN: Pyro 4.9 released
Message-ID: <4e767930$0$2480$e4fe514c@news2.news.xs4all.nl>

Hello,

Pyro 4.9 has just been released!

Get it from Pypi:  http://pypi.python.org/pypi/Pyro4/
Documentation: http://packages.python.org/Pyro4/index.html

Changes include:

* the documentation has finally been completed
* changed asyncresult a little in non-compatible ways.
* added more examples: gui_eventloop, deadlock, itunes
* serialized data is released a bit faster to improve garbage collection
* fixed setting several socket options such as SO_REUSEADDR.

(See the change log in the documentation for a more detailed list)


Pyro = Python Remote Objects. It is a library that enables you to build applications in
which objects can talk to each other over the network, with minimal programming effort.
You can just use normal Python method calls, with almost every possible parameter and
return value type, and Pyro takes care of locating the right object on the right
computer to execute the method. It is designed to be very easy to use, and to generally
stay out of your way. But it also provides a set of powerful features that enables you
to build distributed applications rapidly and effortlessly. Pyro is written in 100% pure
Python and therefore runs on many platforms and Python versions, including Python 3.x.


Enjoy,

Irmen de Jong



From ian.g.kelly at gmail.com  Mon Sep 19 01:41:29 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sun, 18 Sep 2011 23:41:29 -0600
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
Message-ID: <CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>

On Sat, Sep 17, 2011 at 5:38 PM, Chris Angelico <rosuav at gmail.com> wrote:
> But if it's done as an exception, all you need is to
> catch that exception and reraise it:
>
> def threadWork(lock, a1, a2, rate):
> ? try:
> ? ? ? while True:
> ? ? ? ? ? ? ? time.sleep(rate)
> ? ? ? ? ? ? ? lock.lock()
> ? ? ? ? ? ? ? t = a2.balance / 2
> ? ? ? ? ? ? ? a1.balance += t
> ? ? ? ? ? ? ? #say a thread.kill kills at this point
> ? ? ? ? ? ? ? a2.balance -= t
> ? ? ? ? ? ? ? lock.release()
> ?except:
> ? ? ?# roll back the transaction in some way
> ? ? ?lock.release()
> ? ? ?raise

And what if the thread gets killed a second time while it's in the except block?

> It'd require some care in coding, but it could be done. And if the
> lock/transaction object can be coded for it, it could even be done
> automatically:
>
> def threadWork(lock, a1, a2, rate):
> ? ? ? while True:
> ? ? ? ? ? ? ? time.sleep(rate)
> ? ? ? ? ? ? ? transaction.begin()
> ? ? ? ? ? ? ? t = a2.balance / 2
> ? ? ? ? ? ? ? transaction.apply(a1.balance,t)
> ? ? ? ? ? ? ? #say a thread.kill kills at this point
> ? ? ? ? ? ? ? transaction.apply(a2.balance,-t)
> ? ? ? ? ? ? ? transaction.commit()
>
> If the transaction object doesn't get its commit() called, it does no
> actions at all, thus eliminating all issues of locks.

And what if the thread gets killed in the middle of the commit?

Getting the code right is going to be a lot more complicated than just
adding a couple of try/excepts.

Cheers,
Ian


From greg.ewing at canterbury.ac.nz  Mon Sep 19 01:56:42 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 19 Sep 2011 17:56:42 +1200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <mailman.1272.1316410920.27778.python-list@python.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>	<j53aag$7n8$1@dough.gmane.org>	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<mailman.1272.1316410920.27778.python-list@python.org>
Message-ID: <9do3stFtq8U1@mid.individual.net>

Ian Kelly wrote:

> And what if the thread gets killed a second time while it's in the except block?

> And what if the thread gets killed in the middle of the commit?

For these kinds of reasons, any feature for raising asynchronous
exceptions in another thread would need to come with some related
facilites:

* A way of blocking asynchronous exceptions around a critical
   section would be needed.

* Once an asynchronous exception has been raised, further
   asynchronous exceptions should be blocked until explicitly
   re-enabled.

* Asynchronous exceptions should probably be disabled initially
   in a new thread until it explicitly enables them.

Some care would still be required to write code that is robust
in the presence of asynchronous exceptions, but given these
facilities, it ought to be possible.

-- 
Greg


From adam.jorgensen.za at gmail.com  Mon Sep 19 02:03:08 2011
From: adam.jorgensen.za at gmail.com (Adam Jorgensen)
Date: Mon, 19 Sep 2011 08:03:08 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
Message-ID: <CAMX1Romi8H1c4YC5co_TVUHu8LtCndRjib5Uw=Hxdf=sUmLueA@mail.gmail.com>

The point of the Java thread.stop() being deprecated seems to have very
little to do with undeclared exceptions being raised and a lot to do
with objects being left in a potentially damaged state.

As Ian said, it's a lot more complex than just adding try/catches. Killing a
thread in the middle of some non-atomic operation with side-effects
that propagate beyond the thread is a recipe for trouble.

In fact, while a a lot can be written about Java being a poor language the
specific article linked to about why Java deprecated thread.stop()
gives a pretty damn good explanation as to why Thread.stop() and the like
are a bad idea and what a better idea might be (Signalling that
a graceful halt should be attempted)
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From rosuav at gmail.com  Mon Sep 19 02:25:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 19 Sep 2011 16:25:59 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
Message-ID: <CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>

On Mon, Sep 19, 2011 at 3:41 PM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> And what if the thread gets killed in the middle of the commit?
>

Database managers solved this problem years ago. It's not done by
preventing death until you're done - death can come from someone
brutally pulling out your power cord. There's no "except
PowerCordRemoved" to protect you from that!

There are various ways, and I'm sure one of them will work for
whatever situation is needed.

ChrisA


From geek.swarup at gmail.com  Mon Sep 19 02:38:53 2011
From: geek.swarup at gmail.com (swarupchandra kamerkar)
Date: Mon, 19 Sep 2011 12:08:53 +0530
Subject: Need help on using the USB module
Message-ID: <CAK2biOMifAik-ZNd+4WAm6MMEBuKvdgnzA1t5Zyf6YQiRGsHkA@mail.gmail.com>

Hi,
   I am trying to use Pythoin on windows.
   I wanted to use the uSB module.

   I downloaded it and installed it.

   Still I get the following message.

 >>> import usb
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    import usb
ImportError: DLL load failed: The specified module could not be found.

What is it that I am missing?

Regards
Swarup
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From Shambhu.Rajak at kpitcummins.com  Mon Sep 19 03:03:10 2011
From: Shambhu.Rajak at kpitcummins.com (Shambhu Rajak)
Date: Mon, 19 Sep 2011 07:03:10 +0000
Subject: What is wrong with this code?
In-Reply-To: <4e766a13$0$29995$c3e8da3$5496439d@news.astraweb.com>
References: <nemo-15092011085110@nemo.com>
	<38d9k8-u8t.ln1@satorlaser.homedns.org> <nemo-18092011170700@nemo.com>
	<4e766a13$0$29995$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <408F64D89899604FB24015E64E10490C0329A3@KCHJEXMB02.kpit.com>

I think you cannnot use "\" as normal string ,it?s a metacharacter, u can use it like this:
'\\begin{document}'

-Shambhu
-----Original Message-----
From: Steven D'Aprano [mailto:steve+comp.lang.python at pearwood.info] 
Sent: Monday, September 19, 2011 3:31 AM
To: python-list at python.org
Subject: Re: What is wrong with this code?

On Sun, 18 Sep 2011 21:07:22 +0000, superhappyfuntime wrote:

> On 09-15-2011, Ulrich Eckhardt <ulrich.eckhardt at dominolaser.com> wrote:
> 
>> superhappyfuntime wrote:
>>>  #this is antiWYSIWYG, an easy to learn cap for begginners to LaTeX.
> 
>> It's LaTeX, not Python.
> 
>> Uli
> 
> no, it's a cap for LaTeX written in python

If it's Python, it's no Python syntax I've ever seen before.


>>> here it is: = '\begin{document}'
  File "<stdin>", line 1
    here it is: = '\begin{document}'
          ^
SyntaxError: invalid syntax


How about if you start off by explaining what you think "a cap for LaTeX" 
means, or provide a link to something that will explain it? This is a 
Python list, and we don't necessarily know much about LaTeX.



-- 
Steven





From chunuan723 at gmail.com  Mon Sep 19 05:15:16 2011
From: chunuan723 at gmail.com (he sharon)
Date: Mon, 19 Sep 2011 02:15:16 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <3138b9b7-7b69-411a-a63f-f0c12cfbe56a@1g2000yqm.googlegroups.com>

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From Antoon.Pardon at rece.vub.ac.be  Mon Sep 19 06:04:01 2011
From: Antoon.Pardon at rece.vub.ac.be (Antoon Pardon)
Date: Mon, 19 Sep 2011 12:04:01 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular expression)
In-Reply-To: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
Message-ID: <20110919100401.GD3410@trout.vub.ac.be>

On Sun, Sep 18, 2011 at 07:35:01AM +1000, Chris Angelico wrote:
> On Sun, Sep 18, 2011 at 5:00 AM, Nobody <nobody at nowhere.com> wrote:

> Forking a thread to discuss threads.... ahem.
> 
> Why is it that threads can't be killed? Do Python threads correspond
> to OS-provided threads (eg POSIX threads on Linux)? Every OS threading
> library I've seen has some way of killing threads, although I've not
> looked in detail into POSIX threads there (there seem to be two
> options, pthread_kill and pthread_cancel, that could be used, but I've
> not used either). If nothing else, it ought to be possible to
> implement a high level kill simply by setting a flag that the
> interpreter will inspect every few commands, the same way that
> KeyboardInterrupt is checked for.
> 
> Is it just that nobody's implemented it, or is there a good reason for
> avoiding offering this sort of thing?

Python has a half baked solution to this. If you go to

  http://docs.python.org/release/3.2.2/c-api/init.html

You will find the following:

int PyThreadState_SetAsyncExc(long id, PyObject *exc)

  Asynchronously raise an exception in a thread. The id argument is
the thread id of the target thread; exc is the exception object to be
raised. This function does not steal any references to exc. To prevent
naive misuse, you must write your own C extension to call this. Must be
called with the GIL held. Returns the number of thread states modified;
this is normally one, but will be zero if the thread id isn?t found. If
exc is NULL, the pending exception (if any) for the thread is cleared.
This raises no exceptions.

Some recipes can be found at:

  http://www.google.com/search?ie=UTF-8&oe=utf-8&q=python+recipe+PyThreadState_SetAsyncExc

However it this doesn't work 100% correctly. Last time I tried
using this, it didn't work with an exception instance but
only with an execption class as parameter. There was a discussion at

  http://mail.python.org/pipermail/python-dev/2006-August/068158.html

about this. I don't know how it was finaly resolved.

-- 
Antoon Pardon


From hfaber at invalid.net  Mon Sep 19 07:11:51 2011
From: hfaber at invalid.net (Henrik Faber)
Date: Mon, 19 Sep 2011 13:11:51 +0200
Subject: Operator commutativity
Message-ID: <j5781l$opq$1@speranza.aioe.org>

Hi there,

when I have a python class X which overloads an operator, I can use that
operator to do any operation for example with an integer

y = X() + 123

however, say I want the "+" operator to be commutative. Then

y = 123 + X()

should have the same result. However, since it does not call __add__ on
an instance of X, but on the int 123, this fails:

TypeError: unsupported operand type(s) for +: 'int' and 'X'

How can I make this commutative?

Best regards,
Henrik


From arnodel at gmail.com  Mon Sep 19 07:17:22 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Mon, 19 Sep 2011 12:17:22 +0100
Subject: Operator commutativity
In-Reply-To: <j5781l$opq$1@speranza.aioe.org>
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <CAJ6cK1ZQuGw1mRpMTWSDP+QP7R9e4CHd3hqxJ4zwvJQo-tOmWQ@mail.gmail.com>

On 19 September 2011 12:11, Henrik Faber <hfaber at invalid.net> wrote:
> Hi there,
>
> when I have a python class X which overloads an operator, I can use that
> operator to do any operation for example with an integer
>
> y = X() + 123
>
> however, say I want the "+" operator to be commutative. Then
>
> y = 123 + X()
>
> should have the same result. However, since it does not call __add__ on
> an instance of X, but on the int 123, this fails:
>
> TypeError: unsupported operand type(s) for +: 'int' and 'X'
>
> How can I make this commutative?

Overload X.__radd__() as well

HTH

-- 
Arnaud


From paul.nospam at rudin.co.uk  Mon Sep 19 07:23:48 2011
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Mon, 19 Sep 2011 12:23:48 +0100
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>

Henrik Faber <hfaber at invalid.net> writes:


> How can I make this commutative?

Incidentally - this isn't really about commutativity at all - the
question is how can you define both left and right versions of add,
irrespective of whether they yield the same result.

I think __radd__ is what you're after.


From duncan.booth at invalid.invalid  Mon Sep 19 07:26:08 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 19 Sep 2011 11:26:08 GMT
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <Xns9F657E7852D0Fduncanbooth@127.0.0.1>

Henrik Faber <hfaber at invalid.net> wrote:

> Hi there,
> 
> when I have a python class X which overloads an operator, I can use that
> operator to do any operation for example with an integer
> 
> y = X() + 123
> 
> however, say I want the "+" operator to be commutative. Then
> 
> y = 123 + X()
> 
> should have the same result. However, since it does not call __add__ on
> an instance of X, but on the int 123, this fails:
> 
> TypeError: unsupported operand type(s) for +: 'int' and 'X'
> 
> How can I make this commutative?
> 
By defining __radd__

>>> class X:
	def __add__(self, other):
		return "%r + %r" % (self, other)
	def __radd__(self, other):
		return "%r + %r" % (other, self)

	
>>> X() + 123
'<__main__.X object at 0x029C45B0> + 123'
>>> 123 + X()
'123 + <__main__.X object at 0x02101910>'


-- 
Duncan Booth http://kupuguy.blogspot.com


From hfaber at invalid.net  Mon Sep 19 07:32:00 2011
From: hfaber at invalid.net (Henrik Faber)
Date: Mon, 19 Sep 2011 13:32:00 +0200
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
Message-ID: <j5797e$s57$1@speranza.aioe.org>

On 19.09.2011 13:23, Paul Rudin wrote:
> Henrik Faber <hfaber at invalid.net> writes:
> 
>> How can I make this commutative?
> 
> Incidentally - this isn't really about commutativity at all - the
> question is how can you define both left and right versions of add,
> irrespective of whether they yield the same result.

Right. The operator+ in my case just happens to be commutative and I
wanted a language way to express this.

> I think __radd__ is what you're after.

It is, thank you very much - I knew there was some way to get this done
nicely. Perfect! :-)

Best regards,
Henrik


From stars9820 at gmail.com  Mon Sep 19 08:09:55 2011
From: stars9820 at gmail.com (star ship)
Date: Mon, 19 Sep 2011 05:09:55 -0700 (PDT)
Subject: AMAZING WORK AT HOME
Message-ID: <2863194c-8fb4-4809-9d50-302ef3e5bbc7@z41g2000yqb.googlegroups.com>

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From roy at panix.com  Mon Sep 19 08:10:27 2011
From: roy at panix.com (Roy Smith)
Date: Mon, 19 Sep 2011 08:10:27 -0400
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
Message-ID: <roy-C1FD55.08102719092011@news.panix.com>

In article <j5797e$s57$1 at speranza.aioe.org>,
 Henrik Faber <hfaber at invalid.net> wrote:

> On 19.09.2011 13:23, Paul Rudin wrote:
> > Henrik Faber <hfaber at invalid.net> writes:
> > 
> >> How can I make this commutative?
> > 
> > Incidentally - this isn't really about commutativity at all - the
> > question is how can you define both left and right versions of add,
> > irrespective of whether they yield the same result.
> 
> Right. The operator+ in my case just happens to be commutative and I
> wanted a language way to express this.
> 
> > I think __radd__ is what you're after.
> 
> It is, thank you very much - I knew there was some way to get this done
> nicely. Perfect! :-)

__radd__() only solves the problem if the left-hand operand has no 
__add__() method itself.

class C1:
    def __add__(self, other):
        print "C1.__add__()"
    def __radd__(self, other):
        print "C1.__radd__()"

class C2:
    def __add__(self, other):
        print "C2.__add__()"
    def __radd__(self, other):
        print "C2.__radd__()"

c1 = C1()
c2 = C2()

c1 + c2
c2 + c1

$ python radd.py
C1.__add__()
C2.__add__()


From robin at reportlab.com  Mon Sep 19 08:42:30 2011
From: robin at reportlab.com (Robin Becker)
Date: Mon, 19 Sep 2011 13:42:30 +0100
Subject: help needed on decimal formatting issue
Message-ID: <4E7738B6.2080000@chamonix.reportlab.co.uk>

I'm not really very used to the decimal module so I'm asking here if any one can 
help me with a problem in a well known third party web framework

The code in question is

def format_number(value, max_digits, decimal_places):
     """
     Formats a number into a string with the requisite number of digits and
     decimal places.
     """
     if isinstance(value, decimal.Decimal):
         context = decimal.getcontext().copy()
         context.prec = max_digits
         return u'%s' % str(
          value.quantize(decimal.Decimal(".1") ** decimal_places,
                        context=context))
     else:
         return u"%.*f" % (decimal_places, value)


we have set up decimal fields with max_digits=7 decimal_places=2 and 
max_digits=10, decimal_places=4. We are getting issues with quantize failing 
with the message 'quantize result has too many digits for current context'.

Anyhow, I believe that we need to adjust the above code so that the precision is 
actually set to

     context.prec = max_digits+decimal_places

but I'm not certain that is right. Presumably the author thought that the fields 
could have large values of both max_digits and decimal_places. Initially I 
thought precision must be to do with decimal_places only, but changing
     context.prec = decimal_places

did not fix the issue. Can someone enlighten me? The failing case for the 
original code was

format_number(Decimal('914146.80'),7,2)

with context.prec = decimal_places we failed differently with

format_number(Decimal('42.7571'),10,4)

so I adopted context.prec = max_digits+decimal_places and that seems to work. If 
this is indeed a proper fix I will send a bug report to the well known jazz 
based framework.
-- 
Robin Becker



From ethan at stoneleaf.us  Mon Sep 19 08:48:07 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Mon, 19 Sep 2011 05:48:07 -0700
Subject: Operator commutativity
In-Reply-To: <roy-C1FD55.08102719092011@news.panix.com>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
Message-ID: <4E773A07.6090505@stoneleaf.us>

Roy Smith wrote:
> In article <j5797e$s57$1 at speranza.aioe.org>,
>  Henrik Faber <hfaber at invalid.net> wrote:
> 
>> On 19.09.2011 13:23, Paul Rudin wrote:
>>> Henrik Faber <hfaber at invalid.net> writes:
>>>
>>>> How can I make this commutative?
>>> Incidentally - this isn't really about commutativity at all - the
>>> question is how can you define both left and right versions of add,
>>> irrespective of whether they yield the same result.
>> Right. The operator+ in my case just happens to be commutative and I
>> wanted a language way to express this.
>>
>>> I think __radd__ is what you're after.
>> It is, thank you very much - I knew there was some way to get this done
>> nicely. Perfect! :-)
> 
> __radd__() only solves the problem if the left-hand operand has no 
> __add__() method itself.

Only true if the left-hand operand is so ill-behaved it doesn't check to 
see if it makes sense to add itself to the right-hand operand.  If it 
doesn't know how, it should `return NotImplemented` -- Python will then 
try __radd__ on the left-hand operand.

Also, if the right-hand operand is a subclass of the left-hand operand 
then Python will try right-hand_operand.__radd__ first.

Now, if the left-hand operand *does* know how (or thinks it does, which 
could be another matter entirely), and the right-hand operand is *not* a 
subclass of the left-hand operand, then you are correct -- the 
right-hand operand wil not be called.

~Ethan~


From brian.curtin at gmail.com  Mon Sep 19 10:00:25 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Mon, 19 Sep 2011 09:00:25 -0500
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <j52nab$bfc$1@dont-email.me>
References: <j52nab$bfc$1@dont-email.me>
Message-ID: <CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>

On Sat, Sep 17, 2011 at 13:01, Kevin Walzer <kw at codebykevin.com> wrote:
> I have been testing my Python application on the just-released developer
> preview of Windows 8 and have noted an error: the application does not
> create an app folder in the user's "application data" directory. This causes
> the app to crash on startup. Manually creating the directory solves the
> problem. Since the app uses an os.mkdir() call to create the directory, and
> since the app runs fine on Windows 7, my guess is that the bug lies
> somewhere in the interaction between Python (I'm using ActivePython 2.7) and
> Windows.
>
> Here's the relevant code:
>
> ? ?#make preferences directory if it does not exist
> ? ?def makePrefsDir(self):
> ? ? ? ?self.appdir = os.path.join(os.path.join(os.environ['APPDATA'],
> 'MyApp'))
> ? ? ? ?if not os.path.exists(self.appdir):
> ? ? ? ? ? ?os.mkdir(self.appdir)
>
> I realize that this developer preview of Windows is still at somewhere
> between alpha- and beta-level, and it's possible things will get better.
> Should I wait to report this as a bug until Windows 8 is released, or do the
> Python developers test Python on pre-release versions of Windows?

First, is your application actually crashing, or does it just exit due
to an unhandled exception? I suspect the latter, so if that's true,
what's the exception and message?

You said "the application does not create an app folder in the user's
'application data' directory" -- what does this mean, or rather, what
is the specific folder you're expecting to have? If Python can't
create the directory but you can do it manually, there may be some
permission or access differences new to Windows 8. What does "echo
%APPDATA%" give you?

I haven't installed Windows 8 yet, but I'm planning to get it up and
running soon. If you submit issues to http://bugs.python.org,
hopefully with specific test cases that we can run and work with,
it'll be easier to track and fix. If you do that, add me to the nosy
list on the issues - tracker id: brian.curtin, I'm one of the Windows
people around there.


From torpedoallen at gmail.com  Mon Sep 19 11:21:10 2011
From: torpedoallen at gmail.com (Christian Ren)
Date: Mon, 19 Sep 2011 08:21:10 -0700 (PDT)
Subject: help for the parse of encrypted excel
Message-ID: <e221bb1b-33c5-4dfe-8785-bb4bf1cb031a@fi7g2000vbb.googlegroups.com>

I used xlrd library for the parse of excel before. But now, I
encounter a problem that the file has been encrypted for some security
reason. On the official website, i found "xlrd will not attempt to
decode password-protected (encrypted) files. " :((
And I also tried another library called pyExcelerator, Unfortunately,
it failed all the same.
Is there anybody can tell me what's the solution to the parse of
encrypted excel? Thanks in advance.
(PS: for the user experience reason, I don't hope to save this file as
another copy)


From tjreedy at udel.edu  Mon Sep 19 11:25:04 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 19 Sep 2011 11:25:04 -0400
Subject: Operator commutativity
In-Reply-To: <4E773A07.6090505@stoneleaf.us>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<4E773A07.6090505@stoneleaf.us>
Message-ID: <j57msh$no4$1@dough.gmane.org>

On 9/19/2011 8:48 AM, Ethan Furman wrote:
> Roy Smith wrote:

>> __radd__() only solves the problem if the left-hand operand has no
>> __add__() method itself.
>
> Only true if the left-hand operand is so ill-behaved it doesn't check to
> see if it makes sense to add itself to the right-hand operand. If it
> doesn't know how, it should `return NotImplemented` -- Python will then
> try __radd__ on the left-hand operand.
>
> Also, if the right-hand operand is a subclass of the left-hand operand
> then Python will try right-hand_operand.__radd__ first.

The builtin classes like int are (should be, sans bug) well-behaved.

> Now, if the left-hand operand *does* know how (or thinks it does, which
> could be another matter entirely), and the right-hand operand is *not* a
> subclass of the left-hand operand, then you are correct -- the
> right-hand operand wil not be called.

So the potential problems arise with two user classes.

-- 
Terry Jan Reedy



From mdickinson at enthought.com  Mon Sep 19 12:12:01 2011
From: mdickinson at enthought.com (Mark Dickinson)
Date: Mon, 19 Sep 2011 09:12:01 -0700 (PDT)
Subject: help needed on decimal formatting issue
References: <mailman.1282.1316436173.27778.python-list@python.org>
Message-ID: <150e2270-84a7-45ae-ae56-681f0b26c62a@1g2000vbu.googlegroups.com>

On Sep 19, 1:42?pm, Robin Becker <ro... at reportlab.com> wrote:
> I'm not really very used to the decimal module so I'm asking here if any one can
> help me with a problem in a well known third party web framework
>
> The code in question is
>
> def format_number(value, max_digits, decimal_places):
> ? ? ?"""
> ? ? ?Formats a number into a string with the requisite number of digits and
> ? ? ?decimal places.
> ? ? ?"""
> ? ? ?if isinstance(value, decimal.Decimal):
> ? ? ? ? ?context = decimal.getcontext().copy()
> ? ? ? ? ?context.prec = max_digits
> ? ? ? ? ?return u'%s' % str(
> ? ? ? ? ? value.quantize(decimal.Decimal(".1") ** decimal_places,
> ? ? ? ? ? ? ? ? ? ? ? ? context=context))
> ? ? ?else:
> ? ? ? ? ?return u"%.*f" % (decimal_places, value)

What's the meaning of the 'max_digits' argument here?  Are you
guaranteed that the incoming value is smaller than 10**max_digits in
absolute value?

If so, then a precision of max_digits + decimal_places + 1 should be
enough.  The +1 is there to cover the corner case where a value close
to 10**max_digits is rounded up to 10**max_digits by the quantize
operation.

BTW, that's a fairly horrible way of creating the first argument to
the quantize method, too.  It would be more efficient to do something
like:

>>> decimal_places = 2
>>> decimal.Decimal('0.{}1'.format('0'*(decimal_places-1)))
Decimal('0.01')

(perhaps with suitable special-casing for the case where
decimal_places <= 0;  not sure whether this applies in your context).

--
Mark


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From anikom15 at gmail.com  Mon Sep 19 12:45:53 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Mon, 19 Sep 2011 09:45:53 -0700
Subject: Operator commutativity
In-Reply-To: <j5781l$opq$1@speranza.aioe.org>
References: <j5781l$opq$1@speranza.aioe.org>
Message-ID: <20110919164553.GA20521@Smoke>

On Mon, Sep 19, 2011 at 01:11:51PM +0200, Henrik Faber wrote:
> Hi there,
> 
> when I have a python class X which overloads an operator, I can use that
> operator to do any operation for example with an integer
> 
> y = X() + 123
> 
> however, say I want the "+" operator to be commutative. Then
> 
> y = 123 + X()
> 
> should have the same result. However, since it does not call __add__ on
> an instance of X, but on the int 123, this fails:
> 
> TypeError: unsupported operand type(s) for +: 'int' and 'X'
> 
> How can I make this commutative?
> 
> Best regards,
> Henri

def __radd__(self, other):
    return self.__add__(self, other)


From bahamutzero8825 at gmail.com  Mon Sep 19 16:40:00 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Mon, 19 Sep 2011 15:40:00 -0500
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
References: <j52nab$bfc$1@dont-email.me>
	<CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
Message-ID: <4E77A8A0.3030104@gmail.com>

On 2011.09.19 09:00 AM, Brian Curtin wrote:
> You said "the application does not create an app folder in the user's
> 'application data' directory" -- what does this mean, or rather, what
> is the specific folder you're expecting to have? If Python can't
> create the directory but you can do it manually, there may be some
> permission or access differences new to Windows 8. What does "echo
> %APPDATA%" give you?
I booted up the Win8 dev preview in a VM and os.environ['appdata'] gives
me the same result it would for Windows 7. Perhaps the problem lies in
the os.path.exists() call (that is, Win8 and Win7 react differently to
this call). I personally would try to create the directory and then
catch either a WindowsError (error 183) or an OSError (error 17) if the
directory already exists. I might play around with this later and post
some results.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2
PGP/GPG Public Key ID: 0xF88E034060A78FCB


From nobody at nowhere.com  Mon Sep 19 17:54:49 2011
From: nobody at nowhere.com (Nobody)
Date: Mon, 19 Sep 2011 22:54:49 +0100
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular	expression)
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<mailman.1272.1316410920.27778.python-list@python.org>
Message-ID: <pan.2011.09.19.21.54.48.390000@nowhere.com>

On Sun, 18 Sep 2011 23:41:29 -0600, Ian Kelly wrote:

>> If the transaction object doesn't get its commit() called, it does no
>> actions at all, thus eliminating all issues of locks.
> 
> And what if the thread gets killed in the middle of the commit?

The essence of a commit is that it involves an atomic operation, for which
there is no "middle".



From ian.g.kelly at gmail.com  Mon Sep 19 18:04:17 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 19 Sep 2011 16:04:17 -0600
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
	<CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>
Message-ID: <CALwzidkqoYmq8UAmsphB2SaHv9SwmGm+FyiVoXuFqURUOFDqnA@mail.gmail.com>

On Mon, Sep 19, 2011 at 12:25 AM, Chris Angelico <rosuav at gmail.com> wrote:
> On Mon, Sep 19, 2011 at 3:41 PM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
>> And what if the thread gets killed in the middle of the commit?
>>
>
> Database managers solved this problem years ago. It's not done by
> preventing death until you're done - death can come from someone
> brutally pulling out your power cord. There's no "except
> PowerCordRemoved" to protect you from that!

I'm aware of that.  I'm not saying it's impossible, just that the
example you gave is over-simplified, as writing atomic transactional
logic is a rather complex topic.  There may be an existing Python
library to handle this, but I'm not aware of one.

"PowerCordRemoved" is not relevant here, as that would kill the entire
process, which renders the issue of broken shared data within a
continuing process rather moot.

Cheers,
Ian


From bahamutzero8825 at gmail.com  Mon Sep 19 18:38:32 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Mon, 19 Sep 2011 17:38:32 -0500
Subject: logging.config and {-style formatting
Message-ID: <4E77C468.30709@gmail.com>

Is it possible to use {-style formatting with a logging config file? I
can add style='{' to a logging.Formatter() call and it works fine, but I
see no way of doing this from a config file. I tried adding a style
option in the config file, but it has no effect. I see no mention of the
{-style in the logging.config docs, so am I right to assume {-style
formatting is not implemented in logging.config?

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From mindwalkernine at gmail.com  Mon Sep 19 19:13:06 2011
From: mindwalkernine at gmail.com (Jordan Evans)
Date: Mon, 19 Sep 2011 18:13:06 -0500
Subject: Dynamically Cause A Function To Return
Message-ID: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>

I want dynamically place the 'return' statement in a function via user input
or achieve the same through some other means.  If some other means, the user
must be able initiate this at runtime during a raw_input().  This is what I
have so far, this would be an awesome command line debugging tool if I can
get it to work.

def b(label="", *args):
    """Used to create breaks for debugging.  Will break the function or
continue the function it is place within based on user input.  Has as a
input loop for querying variables and executing code before a break or a
continue."""
    print label+":",
    for arg in args:
        print str(arg),
    if len(args):
        print
    x = ""
    while x != ".":
        command = raw_input()
        try:
            exec command
        except:
            pass
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From sridharr at activestate.com  Mon Sep 19 19:27:40 2011
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Mon, 19 Sep 2011 16:27:40 -0700
Subject: ANN: ActivePython 3.2.2.3 is now available
Message-ID: <9643CBF5-DC47-4A59-93B9-1610031E4ACF@activestate.com>

ActiveState is pleased to announce ActivePython 3.2.2.3, a complete, ready-to-install binary distribution of Python 3.2.

  http://www.activestate.com/activepython/downloads


What's New in ActivePython-3.2.2.3
==================================

New Features & Upgrades
-----------------------

- Upgrade to Python 3.2.2 (`release notes
 <http://hg.python.org/cpython/file/v3.2.2/Misc/NEWS>`__)
- [Windows] Security upgrade to openssl-1.0.0e
- Upgraded the following packages:

 - Distribute-0.6.21
 - virtualenv-1.6.4

What is ActivePython?
=====================

ActivePython is ActiveState's binary distribution of Python. Builds for Windows, Mac OS X, Linux are made freely available. Solaris, HP-UX and AIX builds, and access to older versions are available in ActivePython Business, Enterprise and OEM editions:

  http://www.activestate.com/python

ActivePython includes the Python core and the many core extensions: zlib and bzip2 for data compression, the Berkeley DB (bsddb) and SQLite (sqlite3) database libraries, OpenSSL bindings for HTTPS support, the Tix GUI widgets for Tkinter, ElementTree for XML processing, ctypes (on supported platforms) for low-level library access, and others. The Windows distribution ships with PyWin32 -- a suite of Windows tools developed by Mark Hammond, including bindings to the Win32 API and Windows COM.

ActivePython also includes a binary package manager for Python (PyPM) that can be used to install packages much easily. For example:

  C:\>pypm install numpy
  [...]

  C:\>python
  >>> import numpy.linalg
  >>>

See this page for full details:

  http://docs.activestate.com/activepython/3.2/whatsincluded.html

As well, ActivePython ships with a wealth of documentation for both new and experienced Python programmers. In addition to the core Python docs, ActivePython includes the "What's New in Python" series, "Dive into Python", the Python FAQs & HOWTOs, and the Python Enhancement Proposals (PEPs).

An online version of the docs can be found here:

  http://docs.activestate.com/activepython/3.2/

We would welcome any and all feedback to:

  activepython-feedback at activestate.com

Please file bugs against ActivePython at:

  http://bugs.activestate.com/enter_bug.cgi?product=ActivePython

Supported Platforms
===================

ActivePython is available for the following platforms:

- Windows (x86 and x64)
- Mac OS X (x86 and x86_64; 10.5+)
- Linux (x86 and x86_64)

- Solaris/SPARC (32-bit and 64-bit) (Business, Enterprise or OEM edition only)
- Solaris/x86 (32-bit) (Business, Enterprise or OEM edition only)
- HP-UX/PA-RISC (32-bit) (Business, Enterprise or OEM edition only)
- HP-UX/IA-64 (32-bit and 64-bit) (Enterprise or OEM edition only)
- AIX/PowerPC (32-bit and 64-bit) (Business, Enterprise or OEM edition only)

More information about the Business Edition can be found here:

  http://www.activestate.com/business-edition

Custom builds are available in the Enterprise Edition:

  http://www.activestate.com/enterprise-edition

Thanks, and enjoy!

The Python Team

--
Sridhar Ratnakumar
sridharr at activestate.com

From rosuav at gmail.com  Mon Sep 19 20:18:02 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Tue, 20 Sep 2011 10:18:02 +1000
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <CALwzidkqoYmq8UAmsphB2SaHv9SwmGm+FyiVoXuFqURUOFDqnA@mail.gmail.com>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<j53aag$7n8$1@dough.gmane.org>
	<CAPTjJmom6XpKw14ci_vp9PkC1OgH5kGAGfwhiXwDGKO8RNs+-w@mail.gmail.com>
	<CALwzidnVw3r+s+0avSr56C0KJgFsv59k_QKt19FZ+rDP7t_9ng@mail.gmail.com>
	<CAPTjJmom1bsa_D0Uv9qzrAbJCNt-V5j9M2kg5K1x+6ZRQ=CHjw@mail.gmail.com>
	<CALwzidkqoYmq8UAmsphB2SaHv9SwmGm+FyiVoXuFqURUOFDqnA@mail.gmail.com>
Message-ID: <CAPTjJmpu6+7z9+0NKCWphYq50xO5gynMo_4uaMCS7JOtAamXUA@mail.gmail.com>

On Tue, Sep 20, 2011 at 8:04 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> "PowerCordRemoved" is not relevant here, as that would kill the entire
> process, which renders the issue of broken shared data within a
> continuing process rather moot.
>

Assuming that the "broken shared data" exists only in RAM on one
single machine, and has no impact on the state of anything on the hard
disk or on any other computer, yes.

ChrisA


From chunuan723 at gmail.com  Mon Sep 19 20:37:31 2011
From: chunuan723 at gmail.com (he sharon)
Date: Mon, 19 Sep 2011 17:37:31 -0700 (PDT)
Subject: red bull hats, monster energy hats on www.popbaseballhats.com
Message-ID: <7345edb4-a967-4c69-a212-d5072809e360@19g2000vbx.googlegroups.com>

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From greg.ewing at canterbury.ac.nz  Mon Sep 19 20:51:42 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 20 Sep 2011 12:51:42 +1200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <mailman.1279.1316426806.27778.python-list@python.org>
References: <CAPTjJmrF_gsM2OsGa+ihxuVyMihUN7QzBPVnb7HFx2tVC7SeHQ@mail.gmail.com>
	<mailman.1279.1316426806.27778.python-list@python.org>
Message-ID: <9dq6cvF4ndU1@mid.individual.net>

Antoon Pardon wrote:

> int PyThreadState_SetAsyncExc(long id, PyObject *exc)
> 
> To prevent
> naive misuse, you must write your own C extension to call this.

Not if we use ctypes! Muahahahaaa!

-- 
Greg


From steve+comp.lang.python at pearwood.info  Mon Sep 19 21:22:41 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Tue, 20 Sep 2011 11:22:41 +1000
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
Message-ID: <4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>

Westley Mart?nez wrote:

> def __radd__(self, other):
>     return self.__add__(self, other)

Which, inside a class, can be simplified to:

    __radd__ = __add__



-- 
Steven



From roy at panix.com  Mon Sep 19 22:26:30 2011
From: roy at panix.com (Roy Smith)
Date: Mon, 19 Sep 2011 22:26:30 -0400
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
	<4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-E8DAD5.22263019092011@news.panix.com>

In article <4e77eae1$0$29978$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> Westley Mart??nez wrote:
> 
> > def __radd__(self, other):
> >     return self.__add__(self, other)
> 
> Which, inside a class, can be simplified to:
> 
>     __radd__ = __add__

Ooh, I could see that leading to some weird diagnostics.  For example:

class Foo:
    def __add__(self, other):
        raise Exception

    __radd__ = __add__

f1 = Foo()
print 1 + f1

produces:

./add.py
Traceback (most recent call last):
  File "./add.py", line 11, in <module>
    print 1 + f1
  File "./add.py", line 5, in __add__
    raise Exception
Exception

which leaves the user wondering why __add__() was called when clearly 
__radd__() should have been.  The way Westley wrote it (modulo fixing 
the __add__() call signature) produces:

./add.py
Traceback (most recent call last):
  File "./add.py", line 11, in <module>
    print 1 + f1
  File "./add.py", line 8, in __radd__
    return self.__add__(other)
  File "./add.py", line 5, in __add__
    raise Exception
Exception

which at least is a stack trace that shows that __radd__() was called.


From steve+comp.lang.python at pearwood.info  Mon Sep 19 22:43:25 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 20 Sep 2011 02:43:25 GMT
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
	<4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>
	<roy-E8DAD5.22263019092011@news.panix.com>
Message-ID: <4e77fdcd$0$29995$c3e8da3$5496439d@news.astraweb.com>

On Mon, 19 Sep 2011 22:26:30 -0400, Roy Smith wrote:

> In article <4e77eae1$0$29978$c3e8da3$5496439d at news.astraweb.com>,
>  Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> 
>> Westley Mart?nez wrote:
>> 
>> > def __radd__(self, other):
>> >     return self.__add__(self, other)
>> 
>> Which, inside a class, can be simplified to:
>> 
>>     __radd__ = __add__
> 
> Ooh, I could see that leading to some weird diagnostics.

"Weird"?

You've lived a sheltered life if you think a function being known under 
two names is weird. Wait until you discover monkey-patching built-ins for 
fun and profit!



-- 
Steven


From anikom15 at gmail.com  Mon Sep 19 22:53:39 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Mon, 19 Sep 2011 19:53:39 -0700
Subject: Operator commutativity
In-Reply-To: <roy-E8DAD5.22263019092011@news.panix.com>
References: <j5781l$opq$1@speranza.aioe.org>
	<mailman.1286.1316450763.27778.python-list@python.org>
	<4e77eae1$0$29978$c3e8da3$5496439d@news.astraweb.com>
	<roy-E8DAD5.22263019092011@news.panix.com>
Message-ID: <20110920025339.GA22418@Smoke>

On Mon, Sep 19, 2011 at 10:26:30PM -0400, Roy Smith wrote:
> In article <4e77eae1$0$29978$c3e8da3$5496439d at news.astraweb.com>,
>  Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> 
> > Westley Mart??nez wrote:
> > 
> > > def __radd__(self, other):
> > >     return self.__add__(self, other)
> > 
> > Which, inside a class, can be simplified to:
> > 
> >     __radd__ = __add__
> 
> Ooh, I could see that leading to some weird diagnostics.  For example:
> 
> class Foo:
>     def __add__(self, other):
>         raise Exception
> 
>     __radd__ = __add__
> 
> f1 = Foo()
> print 1 + f1
> 
> produces:
> 
> ./add.py
> Traceback (most recent call last):
>   File "./add.py", line 11, in <module>
>     print 1 + f1
>   File "./add.py", line 5, in __add__
>     raise Exception
> Exception
> 
> which leaves the user wondering why __add__() was called when clearly 
> __radd__() should have been.  The way Westley wrote it (modulo fixing 
> the __add__() call signature) produces:
> 
> ./add.py
> Traceback (most recent call last):
>   File "./add.py", line 11, in <module>
>     print 1 + f1
>   File "./add.py", line 8, in __radd__
>     return self.__add__(other)
>   File "./add.py", line 5, in __add__
>     raise Exception
> Exception
> 
> which at least is a stack trace that shows that __radd__() was called.

Calling __radd__ = __add__ simply creates a reference to __add__ named
__radd__, it doesn't create a new method.


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From: stars9820 at gmail.com (star ship)
Date: Mon, 19 Sep 2011 22:34:59 -0700 (PDT)
Subject: DATA ENTRY JOB
Message-ID: <e11f5118-6705-4df8-8dce-ab2f219431d0@u20g2000yqj.googlegroups.com>

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Date: Tue, 20 Sep 2011 00:55:20 -0700 (PDT)
Subject: red bull hats of http:www.discounthats.net
Message-ID: <1dcd1d21-b168-4f73-8411-50903d6fd665@19g2000vbx.googlegroups.com>

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Date: Tue, 20 Sep 2011 01:07:44 -0700 (PDT)
Subject: red bull hats of http:www.discounthats.net
Message-ID: <fbcca148-4963-4882-a6d2-1898ce809633@s20g2000yqh.googlegroups.com>

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From mateusz at loskot.net  Tue Sep 20 06:34:42 2011
From: mateusz at loskot.net (Mateusz Loskot)
Date: Tue, 20 Sep 2011 11:34:42 +0100
Subject: PyEval_EvalCodeEx return value
Message-ID: <4E786C42.3050309@loskot.net>

Hi,

I'm trying to dig out details about what exactly is the return
value the of PyEval_EvalCodeEx function in Python 3.x
The documentation is sparse, unfortunately.

Perhaps I'm looking at wrong function.
My aim is simple, I need to execute Python code using Python interpreter 
embedded in my C++ application.
The Python code is a simple script that always returns single value.
For example:

#! /usr/bin/env python
def foo(a, b):
    return a + b
f = foo(2, 3)

But, f can be of different type for different script: one returns 
numeric value, another returns a sequence, so the type is not
possible to be determined in advance.

I know how to capture Python stdout/stderr.

I also know how to access the "f" attribute using
PyObject_GetAttrString and then I can convert "f" value to C++ type
depending on PyObject type.

However, I guess there shall be a way to access "f" value
directly from PyEval_EvalCode return object:

PyObject* evalRet = ::PyEval_EvalCode(...);

But, I can't find any details what the "evalRet" actually is.

Any pointers would be helpful.

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org
Member of ACCU, http://accu.org


From alec.taylor6 at gmail.com  Tue Sep 20 08:32:53 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Tue, 20 Sep 2011 22:32:53 +1000
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <4E77A8A0.3030104@gmail.com>
References: <j52nab$bfc$1@dont-email.me>
	<CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
	<4E77A8A0.3030104@gmail.com>
Message-ID: <CAO+9iGf1=jsG5=+cP0DL5z5GrNAMuDEtxc4yi0AGOeD9FrmVzA@mail.gmail.com>

I can confirm that os.mkdir('C:\\h') and os.path.exists('C:\\h') work
on Windows 8 Dev x64.

On Tue, Sep 20, 2011 at 6:40 AM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> On 2011.09.19 09:00 AM, Brian Curtin wrote:
>> You said "the application does not create an app folder in the user's
>> 'application data' directory" -- what does this mean, or rather, what
>> is the specific folder you're expecting to have? If Python can't
>> create the directory but you can do it manually, there may be some
>> permission or access differences new to Windows 8. What does "echo
>> %APPDATA%" give you?
> I booted up the Win8 dev preview in a VM and os.environ['appdata'] gives
> me the same result it would for Windows 7. Perhaps the problem lies in
> the os.path.exists() call (that is, Win8 and Win7 react differently to
> this call). I personally would try to create the directory and then
> catch either a WindowsError (error 183) or an OSError (error 17) if the
> directory already exists. I might play around with this later and post
> some results.
>
> --
> CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2
> PGP/GPG Public Key ID: 0xF88E034060A78FCB
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From kw at codebykevin.com  Tue Sep 20 08:40:30 2011
From: kw at codebykevin.com (Kevin Walzer)
Date: Tue, 20 Sep 2011 08:40:30 -0400
Subject: Python bug in Windows 8--report now, or later?
In-Reply-To: <mailman.1299.1316521975.27778.python-list@python.org>
References: <j52nab$bfc$1@dont-email.me>
	<CAD+XWwqV0UbsvVsqycNS6WW44iiBJ9=iS7rMj+1t+9WCBzUarw@mail.gmail.com>
	<4E77A8A0.3030104@gmail.com>
	<mailman.1299.1316521975.27778.python-list@python.org>
Message-ID: <j5a1ju$6sk$1@dont-email.me>

On 9/20/11 8:32 AM, Alec Taylor wrote:
> I can confirm that os.mkdir('C:\\h') and os.path.exists('C:\\h') work
> on Windows 8 Dev x64.

OK--looks like I will need to do a bit more digging into my own code. 
Thanks for clarifying.

-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com


From mohammedimran115 at gmail.com  Tue Sep 20 09:57:08 2011
From: mohammedimran115 at gmail.com (mohammed imran)
Date: Tue, 20 Sep 2011 06:57:08 -0700 (PDT)
Subject: mohammedimran
Message-ID: <6cedda83-32da-4d4d-befa-1b6f89768111@f41g2000yqh.googlegroups.com>

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From funthyme at gmail.com  Tue Sep 20 10:40:06 2011
From: funthyme at gmail.com (John Pinner)
Date: Tue, 20 Sep 2011 07:40:06 -0700 (PDT)
Subject: PyEval_EvalCodeEx return value
References: <mailman.1298.1316516670.27778.python-list@python.org>
Message-ID: <3520ac5c-9e75-45b2-a4f1-fc29658bea4b@l4g2000vbv.googlegroups.com>

On Sep 20, 11:34?am, Mateusz Loskot <mate... at loskot.net> wrote:
> Hi,
>
> I'm trying to dig out details about what exactly is the return
> value the of PyEval_EvalCodeEx function in Python 3.x
> The documentation is sparse, unfortunately.
>
> Perhaps I'm looking at wrong function.
> My aim is simple, I need to execute Python code using Python interpreter
> embedded in my C++ application.
> The Python code is a simple script that always returns single value.
> For example:
>
> #! /usr/bin/env python
> def foo(a, b):
> ? ? return a + b
> f = foo(2, 3)
>
> But, f can be of different type for different script: one returns
> numeric value, another returns a sequence, so the type is not
> possible to be determined in advance.
>
> I know how to capture Python stdout/stderr.
>
> I also know how to access the "f" attribute using
> PyObject_GetAttrString and then I can convert "f" value to C++ type
> depending on PyObject type.
>
> However, I guess there shall be a way to access "f" value
> directly from PyEval_EvalCode return object:
>
> PyObject* evalRet = ::PyEval_EvalCode(...);
>
> But, I can't find any details what the "evalRet" actually is.

I assume that you have read the documentation at http://docs.python.org/c-api/veryhigh.html,
and I agree that it's sparse, but the entry for the next entry,
PyEval_EvalCodeEx, tells you a little more, as does that for
PyEval_EvalFrameEx.

Obviously, it's returning a pointer to a PyObject, and Looking at the
source code, that may be NULL, to throw an exception, or an execution
frame, or a generator,etc, etc, depending on the code it's been given.
I guess that you should be able to inspect the PyObject to see what it
is.

What I'm wondering is, why are you eval-ing code ? A favourite device
of C programmers coming to Python (and mea culpa in the past), it's
fraught with potential problems and even security risks, and is
difficult to debug, and maybe you should be using introspection
instead.

And maybe you should be working in Python, and not C++ at this point,
do the dynamic stuff in the language best suited, and then return to C+
+ when needed.

Best wishes,

John
--

> Any pointers would be helpful.
>
> Best regards,
> --
> Mateusz Loskot,http://mateusz.loskot.net
> Charter Member of OSGeo,http://osgeo.org
> Member of ACCU,http://accu.org



From jasfreedom at gmail.com  Tue Sep 20 11:09:21 2011
From: jasfreedom at gmail.com (jasmine jasmine)
Date: Tue, 20 Sep 2011 08:09:21 -0700 (PDT)
Subject: techology
Message-ID: <b2c25c15-31e5-4252-b68e-0d7e99dbf621@fe21g2000vbb.googlegroups.com>

http://123maza.com/48/doll789/


From yasar11732 at gmail.com  Tue Sep 20 12:44:46 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Tue, 20 Sep 2011 19:44:46 +0300
Subject: HTMLParser and non-ascii html pages
Message-ID: <CAFEUn8aEsLsokZPRd-cP=3hQSp-_U=V7U23yRhRVm4LiZqUAaA@mail.gmail.com>

Hi,

I am using a simple sublclass of HTMLParser like this:

class LinkCollector(HTMLParser):

    def reset(self):
        self.links = []
        HTMLParser.reset(self)

    def handle_starttag(self,tag,attr):
        if tag in ("a","link"):
            key = "href"
        elif tag in ("img","script"):
            key = "src"
        else:
            return
        self.links.extend([v for k,v in attr if k == key])

This gives following error:

Traceback (most recent call last):
  File "downloader.py", line 209, in <module>
    if __name__ == "__main__": main()
  File "downloader.py", line 201, in main
    link_collect.feed(response)
  File "C:\Python27\lib\HTMLParser.py", line 108, in feed
    self.goahead(0)
  File "C:\Python27\lib\HTMLParser.py", line 148, in goahead
    k = self.parse_starttag(i)
  File "C:\Python27\lib\HTMLParser.py", line 252, in parse_starttag
    attrvalue = self.unescape(attrvalue)
  File "C:\Python27\lib\HTMLParser.py", line 393, in unescape
    return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities,
s)
  File "C:\Python27\lib\re.py", line 151, in sub
    return _compile(pattern, flags).sub(repl, string, count)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 13:
ordinal not in range(128)

Rest of the code available as attachment. Does anyone know how to solve
this?

-- 
http://yasar.serveblog.net/
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From ppearson at nowhere.invalid  Tue Sep 20 13:07:35 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 20 Sep 2011 17:07:35 GMT
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<mailman.1283.1316436548.27778.python-list@python.org>
Message-ID: <9drvinFngaU1@mid.individual.net>

On Mon, 19 Sep 2011 05:48:07 -0700, Ethan Furman <ethan at stoneleaf.us> wrote:
[snip]
> Also, if the right-hand operand is a subclass of the left-hand operand 
> then Python will try right-hand_operand.__radd__ first.

I don't think it works that way for me:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
>>> class C1():
...     def __add__(self, other):
...         print "C1.__add__()"
... 
>>> class C2(C1):
...     def __radd__(self, other):
...         print "C2.__radd__()"
... 
>>> C1() + C2()
C1.__add__()
>>> 


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


From dreyemi at gmail.com  Tue Sep 20 14:13:32 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 19:13:32 +0100
Subject: Why are my queues empty even though there are items in it?
Message-ID: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>

Hello friends,

I'm writing some Python app that makes use of the multiprocessing and Queue
api to perform
transaction jobs.

My problem is that, the queue always report empty even though I can confirm
that there are items in it.

Below is the code I'm working with:

import multiprocessing
from multiprocessing import Process, Queue
from Queue import Empty

def process(**kwargs):
    q = kwargs['q']
    # Don't start the process if there's no item in queue
    if q.empty():
        print 'empty queue'
        multiprocessing.Process() # Process defaults to None
    else:
        p = multiprocessing.Process(target=transaction_queue, args=(kwargs))
        p.start()

def put_in_queue(items={}):
    print items

    q = multiprocessing.Queue()

    try:
        for k,v in items.iteritems():
            data = v #data is a dict
            timeout = data.get(u'timeout')

            # Put the transaction item in the queue at a specific timeout
            # period
            q.put(data, False, timeout)
            print "{0} put to queue".format(data)
            transaction_queue(q, data, timeout, False)

    except (KeyError, AttributeError, ValueError):
        print 'Incorrect data format'

def transaction_queue(queue, item, timeout, block=False):
    queue = multiprocessing.Queue()
    if item is not {} and timeout is not 0:
        print "Items are {0}".format(item)
        for i in range(len(item)):
            try:
                d = queue.get(block)
                print d
            except Empty:
                print 'Fees queue empty at %s' % (i)
            else:
                return process(q=queue, i=d, t=timeout)
    else:
        print 'No item in the queue to get'

A JSON POST from CURL calls put_in_queue callback:

 curl -v -H "Content-Type: application/json" -X POST --data
'fees={"fees":{"status":"pending","timeout":5},
"hostel":{"status":"pending","timeout": 3}}'
http://127.0.0.1:8000/transaction/add/ > post_data.txt

At code run, the output is:

{u'status': u'pending', u'timeout': 3} put to queue
Items are {u'status': u'pending', u'timeout': 3}
Fees queue empty at 0
Fees queue empty at 1
{u'status': u'pending', u'timeout': 5} put to queue
Items are {u'status': u'pending', u'timeout': 5}
Fees queue empty at 0
Fees queue empty at 1

Q: Why are my queues empty even though there are items in it?

Thanks you for the suggestions and answers.

-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From dreyemi at gmail.com  Tue Sep 20 14:29:06 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 19:29:06 +0100
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAPbrmCtirM3gCWgXm752f6pYAG_8qxV0z-nSetXkxGFGmp5p0A@mail.gmail.com>

On Tue, Sep 20, 2011 at 12:13 AM, Jordan Evans <mindwalkernine at gmail.com>wrote:

> I want dynamically place the 'return' statement in a function via user
> input or achieve the same through some other means.  If some other means,
> the user must be able initiate this at runtime during a raw_input().  This
> is what I have so far, this would be an awesome command line debugging tool
> if I can get it to work.
>
> def b(label="", *args):
>     """Used to create breaks for debugging.  Will break the function or
> continue the function it is place within based on user input.  Has as a
> input loop for querying variables and executing code before a break or a
> continue."""
>     print label+":",
>     for arg in args:
>         print str(arg),
>     if len(args):
>         print
>     x = ""
>     while x != ".":
>         command = raw_input()
>         try:
>             exec command
>         except:
>             pass
>

Isn't this "call by reference" ?

see
http://docs.python.org/faq/programming.html?highlight=kwargs#how-do-i-write-a-function-with-output-parameters-call-by-reference



-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From rosuav at gmail.com  Tue Sep 20 14:35:24 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 21 Sep 2011 04:35:24 +1000
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAPTjJmp5Xy9SrhVCGe2CESxOkmuWYCSufRkV06GjySA=2FXnZQ@mail.gmail.com>

On Tue, Sep 20, 2011 at 9:13 AM, Jordan Evans <mindwalkernine at gmail.com> wrote:
> I want dynamically place the 'return' statement in a function via user input
> or achieve the same through some other means.? If some other means, the user
> must be able initiate this at runtime during a raw_input().? This is what I
> have so far, this would be an awesome command line debugging tool if I can
> get it to work.

Not entirely sure what you're trying to accomplish here. You want to
pepper your code with calls to b() and then have the user be able to
abort the function from there? If so, I can think of two ways:

1) Have b() raise an exception, which you catch at a high level.
That'd unwind the stack all the way to the top, which may or may not
be what you want. Pretty easy to do though.
2) Pepper your code with:
if b(): return
and then have b return 0 normally and 1 when the user asks to abort.

This isn't truly an interactive debugger, though it does potentially
have much value.

ChrisA


From dreyemi at gmail.com  Tue Sep 20 14:35:47 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 19:35:47 +0100
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAPbrmCtqjJpjSJTOt90Uow=7RGPKwn3A4qXAS-YxUhHPac-U0A@mail.gmail.com>

On Tue, Sep 20, 2011 at 12:13 AM, Jordan Evans <mindwalkernine at gmail.com>wrote:

> I want dynamically place the 'return' statement in a function via user
> input or achieve the same through some other means.  If some other means,
> the user must be able initiate this at runtime during a raw_input().  This
> is what I have so far, this would be an awesome command line debugging tool
> if I can get it to work.
>
> def b(label="", *args):
>     """Used to create breaks for debugging.  Will break the function or
> continue the function it is place within based on user input.  Has as a
> input loop for querying variables and executing code before a break or a
> continue."""
>     print label+":",
>     for arg in args:
>         print str(arg),
>     if len(args):
>         print
>     x = ""
>     while x != ".":
>         command = raw_input()
>         try:
>             exec command
>         except:
>             pass
>

It is also possible to create the function in your loop.

for arg in args:
   def f(args):
       return args # You can make this a callback function if you want


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From python at mrabarnett.plus.com  Tue Sep 20 14:42:38 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 20 Sep 2011 19:42:38 +0100
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
Message-ID: <4E78DE9E.3050100@mrabarnett.plus.com>

On 20/09/2011 19:13, Kayode Odeyemi wrote:
> Hello friends,
>
> I'm writing some Python app that makes use of the multiprocessing and
> Queue api to perform
> transaction jobs.
>
> My problem is that, the queue always report empty even though I can
> confirm that there are items in it.
>
> Below is the code I'm working with:
>
[snip]
>
> def transaction_queue(queue, item, timeout, block=False):
>      queue = multiprocessing.Queue()

This line creates a new empty queue, hiding the one which was passed in.

>      if item is not {} and timeout is not 0:

`not {}` has the value True, so `item is not {}` means `item is True`.
The `is` checks for identity, not equality, so this is true only if `item`
actually has the value True or 1 (and this is an implementation-dependent
behaviour).

>          print "Items are {0}".format(item)
>          for i in range(len(item)):

You're trying to get as many items from the queue as there are items in
the dict `item`, which looks wrong to me.

>              try:
>                  d = queue.get(block)
>                  print d
>              except Empty:
>                  print 'Fees queue empty at %s' % (i)
>              else:
>                  return process(q=queue, i=d, t=timeout)
>      else:
>          print 'No item in the queue to get'
>
> A JSON POST from CURL calls put_in_queue callback:
>
>   curl -v -H "Content-Type: application/json" -X POST --data
> 'fees={"fees":{"status":"pending","timeout":5},
> "hostel":{"status":"pending","timeout": 3}}'
> http://127.0.0.1:8000/transaction/add/ > post_data.txt
>
> At code run, the output is:
>
> {u'status': u'pending', u'timeout': 3} put to queue
> Items are {u'status': u'pending', u'timeout': 3}
> Fees queue empty at 0
> Fees queue empty at 1
> {u'status': u'pending', u'timeout': 5} put to queue
> Items are {u'status': u'pending', u'timeout': 5}
> Fees queue empty at 0
> Fees queue empty at 1
>
> Q: Why are my queues empty even though there are items in it?
>
What makes you think there are items in it? You print out `item`, which
is not the queue.

> Thanks you for the suggestions and answers.
>


From arnodel at gmail.com  Tue Sep 20 15:04:29 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 20 Sep 2011 20:04:29 +0100
Subject: Dynamically Cause A Function To Return
In-Reply-To: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
References: <CAAO_QZM3RsHkxL4S-2NFCjCO5zCLXYZXvKBi=yKkSv3_5YL7zg@mail.gmail.com>
Message-ID: <CAJ6cK1ZJedLiKU+6ni8vLhR50QsAmkXmE99jC=hU=0hWa7_UQw@mail.gmail.com>

On 20 September 2011 00:13, Jordan Evans <mindwalkernine at gmail.com> wrote:
> I want dynamically place the 'return' statement in a function via user input
> or achieve the same through some other means.? If some other means, the user
> must be able initiate this at runtime during a raw_input().? This is what I
> have so far, this would be an awesome command line debugging tool if I can
> get it to work.
>
> def b(label="", *args):
> ??? """Used to create breaks for debugging.? Will break the function or
> continue the function it is place within based on user input.? Has as a
> input loop for querying variables and executing code before a break or a
> continue."""
> ??? print label+":",
> ??? for arg in args:
> ??? ??? print str(arg),
> ??? if len(args):
> ??? ??? print
> ??? x = ""
> ??? while x != ".":
> ??? ??? command = raw_input()
> ??? ??? try:
> ??? ??? ??? exec command
> ??? ??? except:
> ??? ??? ??? pass
>

I don't really understand your dynamic return idea, but this reminds
me of some debugging function I wrote some time ago.  It pauses
execution and you can evaluate expression in the current stack frame
and any of its parents using the following syntax:

    <expr> executes <expr> in the stack frame where pause() was inserted
    .<expr> executes it in the parent of this stack frame
    ..<expr> in the grandparent (etc...)

    ? shows all accessible stack frames

def pause():
    import sys, inspect, re
    f = None
    print "\n*** Entering pause mode (EOF to resume)"
    try:
        while True:
            try:
                c = raw_input('pause> ')
                if c == '?':
                    for i, fi in enumerate(inspect.stack()[1:]):
                        print ('%s File "%s", line %s, in %s' %
                               ('.'*i, fi[1], fi[2], fi[3]))
                    continue
                dots = re.match(r'\.*', c)
                back = 0
                if dots:
                    back = len(dots.group())
                f = sys._getframe(back+1)
                code_name = f.f_code.co_name
                cmd = c[back:]
                val = cmd and eval(cmd, f.f_globals, f.f_locals)
                print "(%s) %r" % (code_name, val)
            except Exception, e:
                if isinstance(e, EOFError):
                    del f
                    raise
                print "%s: %s" % (type(e).__name__, e)
    except EOFError:
        pass
    finally:
        print "\n*** Leaving pause mode"


# Simple example of 'pause' in action:

>>> def g(x):
...     b = 5
...     pause()
...
>>> def f(x, y):
...     z = 2
...     g(x)
...     print "And we carry on..."
...
>>> f('spam', [4, 2])

*** Entering pause mode (EOF to resume)
pause> ?
 File "<stdin>", line 3, in g
. File "<stdin>", line 3, in f
.. File "<stdin>", line 1, in <module>
pause> b
(g) 5
pause> b+1
(g) 6
pause> .z
(f) 2
pause> .y
(f) [4, 2]
pause> .x
(f) 'spam'
pause> ..len
(<module>) <built-in function len>
pause> ^D
*** Leaving pause mode
And we carry on...
>>>

-- 
Arnaud


From schesis at gmail.com  Tue Sep 20 15:09:12 2011
From: schesis at gmail.com (Zero Piraeus)
Date: Tue, 20 Sep 2011 15:09:12 -0400
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <4E78DE9E.3050100@mrabarnett.plus.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
	<4E78DE9E.3050100@mrabarnett.plus.com>
Message-ID: <CANaSqUeYzx0u3yW1gKZRmuanV+JMHkMrvu4aq9RbZ+k2mwrLww@mail.gmail.com>

:

On 20 September 2011 14:42, MRAB <python at mrabarnett.plus.com> wrote:
> On 20/09/2011 19:13, Kayode Odeyemi wrote:
>>
>> ? ? if item is not {} and timeout is not 0:
>
> `not {}` has the value True, so `item is not {}` means `item is True`.
> The `is` checks for identity, not equality, so this is true only if `item`
> actually has the value True or 1 (and this is an implementation-dependent
> behaviour).

Nitpick: "is not" is an operator:

>>> "foo" is not {}
True
>>> "foo" is (not {})
False

 -[]z.


From ethan at stoneleaf.us  Tue Sep 20 15:09:15 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Tue, 20 Sep 2011 12:09:15 -0700
Subject: Operator commutativity
In-Reply-To: <9drvinFngaU1@mid.individual.net>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
Message-ID: <4E78E4DB.4040606@stoneleaf.us>

Peter Pearson wrote:
> On Mon, 19 Sep 2011 05:48:07 -0700, Ethan Furman <ethan at stoneleaf.us> wrote:
> [snip]
>> Also, if the right-hand operand is a subclass of the left-hand operand 
>> then Python will try right-hand_operand.__radd__ first.
> 
> I don't think it works that way for me:
> 
> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
>>>> class C1():
> ...     def __add__(self, other):
> ...         print "C1.__add__()"
> ... 
>>>> class C2(C1):
> ...     def __radd__(self, other):
> ...         print "C2.__radd__()"
> ... 
>>>> C1() + C2()
> C1.__add__()

Oh, it has to be a new-style class.  Sorry.

~Ethan~



From python at mrabarnett.plus.com  Tue Sep 20 15:43:18 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 20 Sep 2011 20:43:18 +0100
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <CANaSqUeYzx0u3yW1gKZRmuanV+JMHkMrvu4aq9RbZ+k2mwrLww@mail.gmail.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
	<4E78DE9E.3050100@mrabarnett.plus.com>
	<CANaSqUeYzx0u3yW1gKZRmuanV+JMHkMrvu4aq9RbZ+k2mwrLww@mail.gmail.com>
Message-ID: <4E78ECD6.3010705@mrabarnett.plus.com>

On 20/09/2011 20:09, Zero Piraeus wrote:
> :
>
> On 20 September 2011 14:42, MRAB<python at mrabarnett.plus.com>  wrote:
>> On 20/09/2011 19:13, Kayode Odeyemi wrote:
>>>
>>>      if item is not {} and timeout is not 0:
>>
>> `not {}` has the value True, so `item is not {}` means `item is True`.
>> The `is` checks for identity, not equality, so this is true only if `item`
>> actually has the value True or 1 (and this is an implementation-dependent
>> behaviour).
>
> Nitpick: "is not" is an operator:
>
>>>> "foo" is not {}
> True
>>>> "foo" is (not {})
> False
>
Oops! True.

However, it still doesn't do what the OP intended:

 >>> {} is {}
False
 >>> {} is not {}
True


From dreyemi at gmail.com  Tue Sep 20 15:51:23 2011
From: dreyemi at gmail.com (Kayode Odeyemi)
Date: Tue, 20 Sep 2011 20:51:23 +0100
Subject: Why are my queues empty even though there are items in it?
In-Reply-To: <4E78DE9E.3050100@mrabarnett.plus.com>
References: <CAPbrmCs65=CJLc3YOpmbg3PpVJB+s8kFUmnCyHt81-DpDTikUA@mail.gmail.com>
	<4E78DE9E.3050100@mrabarnett.plus.com>
Message-ID: <CAPbrmCshy_=exQe1jvcFRjY5NRWwxNRPZHqJEZRFXjb-+Q9YNw@mail.gmail.com>

On Tue, Sep 20, 2011 at 7:42 PM, MRAB <python at mrabarnett.plus.com> wrote:

> On 20/09/2011 19:13, Kayode Odeyemi wrote:
>
> def transaction_queue(queue, item, timeout, block=False):
>>     queue = multiprocessing.Queue()
>>
>
> This line creates a new empty queue, hiding the one which was passed in.


Removed.

>
>
>      if item is not {} and timeout is not 0:
>>
>
> `not {}` has the value True, so `item is not {}` means `item is True`.
> The `is` checks for identity, not equality, so this is true only if `item`
> actually has the value True or 1 (and this is an implementation-dependent
> behaviour).


changed to:

if item != {} and timeout != None

>
>
>          print "Items are {0}".format(item)
>>         for i in range(len(item)):
>>
>
> You're trying to get as many items from the queue as there are items in
> the dict `item`, which looks wrong to me.
>
>
>              try:
>>                 d = queue.get(block)
>>                 print d
>>             except Empty:
>>                 print 'Fees queue empty at %s' % (i)
>>             else:
>>                 return process(q=queue, i=d, t=timeout)
>>     else:
>>         print 'No item in the queue to get'
>>
>> Effected this. d has a result in the output (output below). So obviously,
it is not empty.

What I'm trying to do in the initial code is to have all items in the queue
evaluated at the
same time such that each leaves the queue for processing when its timeout
period has elapse.

>
>> Q: Why are my queues empty even though there are items in it?
>>
>>  What makes you think there are items in it? You print out `item`, which
> is not the queue.
>

I've made these changes but the queue still appears empty

None put to queue
{u'status': u'pending', u'timeout': 3}
empty queue
None put to queue
{u'status': u'pending', u'timeout': 5}
empty queue

Why 'empty queue' in process()? Also, why "None put to queue" since d
confirms
the items in the queue?


-- 
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde
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From arnodel at gmail.com  Tue Sep 20 15:59:14 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 20 Sep 2011 20:59:14 +0100
Subject: About MAKE_FUNCTION opcode in Python 3
Message-ID: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>

Since Python 3.0 we have keyword only arguments in functions (see PEP
3102).  Looking at the documentation for the dis module (where opcodes
are documented), I see the following for MAKE_FUNCTION [1]

"""
MAKE_FUNCTION(argc)
Pushes a new function object on the stack. TOS is the code associated
with the function. The function object is defined to have argc default
parameters, which are found below TOS.
"""

No mention of default values for keyword only arguments.  Now let's
try (Python 3.2):

>>> def foo():
...   def bar(x, y, *args, z=1, t=2, **kwargs): pass
...
>>> dis.dis(foo)
  2           0 LOAD_CONST               1 ('z')
              3 LOAD_CONST               2 (1)
              6 LOAD_CONST               3 ('t')
              9 LOAD_CONST               4 (2)
             12 LOAD_CONST               5 (<code object bar at
0x1005ec8b0, file "<stdin>", line 2>)
             15 MAKE_FUNCTION          512
             18 STORE_FAST               0 (bar)
             21 LOAD_CONST               0 (None)
             24 RETURN_VALUE

MAKE_FUNCTION has an argc of 512.  So it seems that since Python 3.0:

* the number of default values for normal arguments is argc & 0xFF
* the number of default values for keyword only arguments is argc >> 8

Can anyone confirm this?  I can then open a ticket on bugs.python.org

[1] http://docs.python.org/dev/library/dis.html#opcode-MAKE_FUNCTION

-- 
Arnaud


From __peter__ at web.de  Tue Sep 20 16:11:58 2011
From: __peter__ at web.de (Peter Otten)
Date: Tue, 20 Sep 2011 22:11:58 +0200
Subject: HTMLParser and non-ascii html pages
References: <CAFEUn8aEsLsokZPRd-cP=3hQSp-_U=V7U23yRhRVm4LiZqUAaA@mail.gmail.com>
Message-ID: <j5as1b$itn$1@dough.gmane.org>

Ya?ar Arabac? wrote:

> I am using a simple sublclass of HTMLParser like this:
> 
> class LinkCollector(HTMLParser):
> 
>     def reset(self):
>         self.links = []
>         HTMLParser.reset(self)
> 
>     def handle_starttag(self,tag,attr):
>         if tag in ("a","link"):
>             key = "href"
>         elif tag in ("img","script"):
>             key = "src"
>         else:
>             return
>         self.links.extend([v for k,v in attr if k == key])
> 
> This gives following error:
> 
> Traceback (most recent call last):
>   File "downloader.py", line 209, in <module>
>     if __name__ == "__main__": main()
>   File "downloader.py", line 201, in main
>     link_collect.feed(response)
>   File "C:\Python27\lib\HTMLParser.py", line 108, in feed
>     self.goahead(0)
>   File "C:\Python27\lib\HTMLParser.py", line 148, in goahead
>     k = self.parse_starttag(i)
>   File "C:\Python27\lib\HTMLParser.py", line 252, in parse_starttag
>     attrvalue = self.unescape(attrvalue)
>   File "C:\Python27\lib\HTMLParser.py", line 393, in unescape
>     return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities,
> s)
>   File "C:\Python27\lib\re.py", line 151, in sub
>     return _compile(pattern, flags).sub(repl, string, count)
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 13:
> ordinal not in range(128)

Trying to reproduce the error:

>>> from HTMLParser import HTMLParser
>>> class P(HTMLParser):
...     def handle_starttag(self, tag, attrs):
...             key, value = attrs[0]
...             print tag, key, "=", value
...
>>> def feed(s):
...     P().feed(s)
...
>>> feed("<a href='yadda'/>")
a href = yadda
>>> feed("<a href='&auml; yadda'/>")
a href = ? yadda
>>> feed("<a href='&auml; ?'/>")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in feed
  File "/usr/local/lib/python2.7/HTMLParser.py", line 108, in feed
    self.goahead(0)
  File "/usr/local/lib/python2.7/HTMLParser.py", line 148, in goahead
    k = self.parse_starttag(i)
  File "/usr/local/lib/python2.7/HTMLParser.py", line 252, in parse_starttag
    attrvalue = self.unescape(attrvalue)
  File "/usr/local/lib/python2.7/HTMLParser.py", line 390, in unescape
    return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities, 
s)
  File "/usr/local/lib/python2.7/re.py", line 151, in sub
    return _compile(pattern, flags).sub(repl, string, count)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: 
ordinal not in range(128)

It seems that the exception is triggered by an attribute value that contains 
both entities and non-ascii bytes.

>>> feed(u"<a href='&auml; ?'/>")
a href = ? ?

> Rest of the code available as attachment. Does anyone know how to solve
> this?

The documentation doesn't mention unicode, but it seems to work anyway:

>>> feed(u"<a href='&auml; ?'/>")
a href = ? ?

So one fix might be to convert the data to unicode before passing it to the 
HTMLParser. 



From ericsnowcurrently at gmail.com  Tue Sep 20 17:56:41 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Tue, 20 Sep 2011 15:56:41 -0600
Subject: About MAKE_FUNCTION opcode in Python 3
In-Reply-To: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
References: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
Message-ID: <CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>

On Tue, Sep 20, 2011 at 1:59 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> Since Python 3.0 we have keyword only arguments in functions (see PEP
> 3102). ?Looking at the documentation for the dis module (where opcodes
> are documented), I see the following for MAKE_FUNCTION [1]
>
> """
> MAKE_FUNCTION(argc)
> Pushes a new function object on the stack. TOS is the code associated
> with the function. The function object is defined to have argc default
> parameters, which are found below TOS.
> """
>
> No mention of default values for keyword only arguments. ?Now let's
> try (Python 3.2):
>
>>>> def foo():
> ... ? def bar(x, y, *args, z=1, t=2, **kwargs): pass
> ...
>>>> dis.dis(foo)
> ?2 ? ? ? ? ? 0 LOAD_CONST ? ? ? ? ? ? ? 1 ('z')
> ? ? ? ? ? ? ?3 LOAD_CONST ? ? ? ? ? ? ? 2 (1)
> ? ? ? ? ? ? ?6 LOAD_CONST ? ? ? ? ? ? ? 3 ('t')
> ? ? ? ? ? ? ?9 LOAD_CONST ? ? ? ? ? ? ? 4 (2)
> ? ? ? ? ? ? 12 LOAD_CONST ? ? ? ? ? ? ? 5 (<code object bar at
> 0x1005ec8b0, file "<stdin>", line 2>)
> ? ? ? ? ? ? 15 MAKE_FUNCTION ? ? ? ? ?512
> ? ? ? ? ? ? 18 STORE_FAST ? ? ? ? ? ? ? 0 (bar)
> ? ? ? ? ? ? 21 LOAD_CONST ? ? ? ? ? ? ? 0 (None)
> ? ? ? ? ? ? 24 RETURN_VALUE
>
> MAKE_FUNCTION has an argc of 512. ?So it seems that since Python 3.0:
>
> * the number of default values for normal arguments is argc & 0xFF
> * the number of default values for keyword only arguments is argc >> 8
>
> Can anyone confirm this? ?I can then open a ticket on bugs.python.org

You're mostly right.

http://hg.python.org/cpython/file/default/Python/ceval.c#l2684

  2684             int posdefaults = oparg & 0xff;
  2685             int kwdefaults = (oparg>>8) & 0xff;
  2686             int num_annotations = (oparg >> 16) & 0x7fff;

-eric

>
> [1] http://docs.python.org/dev/library/dis.html#opcode-MAKE_FUNCTION
>
> --
> Arnaud
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve+comp.lang.python at pearwood.info  Tue Sep 20 21:07:15 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 21 Sep 2011 11:07:15 +1000
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
	<mailman.1311.1316545829.27778.python-list@python.org>
Message-ID: <4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>

Ethan Furman wrote:

> Peter Pearson wrote:
>> On Mon, 19 Sep 2011 05:48:07 -0700, Ethan Furman <ethan at stoneleaf.us>
>> wrote:
>> [snip]
>>> Also, if the right-hand operand is a subclass of the left-hand operand
>>> then Python will try right-hand_operand.__radd__ first.
>> 
>> I don't think it works that way for me:
>> 
>> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
>>>>> class C1():
>> ...     def __add__(self, other):
>> ...         print "C1.__add__()"
>> ...
>>>>> class C2(C1):
>> ...     def __radd__(self, other):
>> ...         print "C2.__radd__()"
>> ...
>>>>> C1() + C2()
>> C1.__add__()
> 
> Oh, it has to be a new-style class.  Sorry.

Even so, I still don't think it quite works the way you have suggested.



class C1(object):
    def __add__(self, other):
        return "__add__(%s, %s)" % (self, other)
    def __radd__(self, other):
        return "__radd__(%s, %s)" % (self, other)

class C2(C1):
    pass


>>> C1() + C2()
'__add__(<__main__.C1 object at 0xb7f79b0c>, <__main__.C2 object at
0xb7f79b6c>)'


I've tried that in both Python 2.6 and 3.2 and get the same result.

However, consider this slight variation:

class D1(object):
    def __add__(self, other):
        return "__add__(%s, %s)" % (self, other)

class D2(D1):
    def __radd__(self, other):
        return "__radd__(%s, %s)" % (self, other)


>>> D1() + D2()
'__radd__(<__main__.D2 object at 0xb7c2c36c>, <__main__.D1 object at
0xb7c2cb0c>)'



After playing around with various combinations of C1, C2, D1 and D2, it
seems to me that the rule is:

If the right-hand argument is a subclass of the left-hand argument, AND also
defines __radd__ directly rather than inheriting it, then its __radd__
method is called before the left-hand argument's __add__ method.


which strikes me as a strangely specific and not very useful rule. I suspect
it might be an accident of implementation rather than a deliberate feature.



-- 
Steven



From rosuav at gmail.com  Tue Sep 20 21:31:57 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 21 Sep 2011 11:31:57 +1000
Subject: Operator commutativity
In-Reply-To: <4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
	<mailman.1311.1316545829.27778.python-list@python.org>
	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmrOeVDT7wXgZJ8Xh2H6H6hP_i20CM7M_7pe+KiAGQPMow@mail.gmail.com>

On Wed, Sep 21, 2011 at 11:07 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> If the right-hand argument is a subclass of the left-hand argument, AND also
> defines __radd__ directly rather than inheriting it, then its __radd__
> method is called before the left-hand argument's __add__ method.
>
> which strikes me as a strangely specific and not very useful rule. I suspect
> it might be an accident of implementation rather than a deliberate feature.

It makes sense, but in a weird way. (Maybe I understand it because I'm
half Dutch? heh) It means that a subclass can override addition for
itself - presumably, it'll define __add__ and __radd__ both - and that
the only time you'd get a false positive (where a function thinks it
can handle the addition but actually there's a better one) is when
it's a subclass. So this is probably correct behaviour, but it's a
fairly weird and esoteric rule.

ChrisA


From tjreedy at udel.edu  Tue Sep 20 23:09:30 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 20 Sep 2011 23:09:30 -0400
Subject: About MAKE_FUNCTION opcode in Python 3
In-Reply-To: <CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>
References: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
	<CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>
Message-ID: <j5bkhc$9ld$1@dough.gmane.org>

On 9/20/2011 5:56 PM, Eric Snow wrote:
> On Tue, Sep 20, 2011 at 1:59 PM, Arnaud Delobelle<arnodel at gmail.com>  wrote:
>> Since Python 3.0 we have keyword only arguments in functions (see PEP
>> 3102).  Looking at the documentation for the dis module (where opcodes
>> are documented), I see the following for MAKE_FUNCTION [1]
>>
>> """
>> MAKE_FUNCTION(argc)
>> Pushes a new function object on the stack. TOS is the code associated
>> with the function. The function object is defined to have argc default
>> parameters, which are found below TOS.
>> """
>>
>> No mention of default values for keyword only arguments.  Now let's
>> try (Python 3.2):
>>
>>>>> def foo():
>> ...   def bar(x, y, *args, z=1, t=2, **kwargs): pass
>> ...
>>>>> dis.dis(foo)
>>   2           0 LOAD_CONST               1 ('z')
>>               3 LOAD_CONST               2 (1)
>>               6 LOAD_CONST               3 ('t')
>>               9 LOAD_CONST               4 (2)
>>              12 LOAD_CONST               5 (<code object bar at
>> 0x1005ec8b0, file "<stdin>", line 2>)
>>              15 MAKE_FUNCTION          512
>>              18 STORE_FAST               0 (bar)
>>              21 LOAD_CONST               0 (None)
>>              24 RETURN_VALUE
>>
>> MAKE_FUNCTION has an argc of 512.  So it seems that since Python 3.0:
>>
>> * the number of default values for normal arguments is argc&  0xFF
>> * the number of default values for keyword only arguments is argc>>  8
>>
>> Can anyone confirm this?  I can then open a ticket on bugs.python.org
>
> You're mostly right.
>
> http://hg.python.org/cpython/file/default/Python/ceval.c#l2684
>
>    2684             int posdefaults = oparg&  0xff;
>    2685             int kwdefaults = (oparg>>8)&  0xff;
>    2686             int num_annotations = (oparg>>  16)&  0x7fff;

>> [1] http://docs.python.org/dev/library/dis.html#opcode-MAKE_FUNCTION

I agree that doc should be updated for 3.x. Please suggest a new working 
if you can, as well as copying the source snippet above. Add me 
terry.reedy as nosy.

-- 
Terry Jan Reedy



From martin at v.loewis.de  Wed Sep 21 01:41:50 2011
From: martin at v.loewis.de (Martin v. Loewis)
Date: Wed, 21 Sep 2011 07:41:50 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running regular
	expression)
In-Reply-To: <mailman.1242.1316295305.27778.python-list@python.org>
References: <mailman.1242.1316295305.27778.python-list@python.org>
Message-ID: <4E79791E.7000903@v.loewis.de>

> Is it just that nobody's implemented it, or is there a good reason for
> avoiding offering this sort of thing?

I've been considering to implement killing threads several times for the
last 15 years (I think about it once every year), and every time
I give up because it's too complex and just not implementable.

To start with, a simple flag in the thread won't do any good. It will
not cancel blocking system calls, so people will complain that the
threads they meant to cancel continue to run forever. Instead, you
have to use some facility to interrupt blocking system calls. You
then have to convince callers of those blocking system calls not to
retry when they see that the first attempt to call it was interrupted.
And so on.

Regards,
Martin


From vraichur at cisco.com  Wed Sep 21 02:42:21 2011
From: vraichur at cisco.com (Vinay)
Date: Wed, 21 Sep 2011 12:12:21 +0530
Subject: Tunneling using paramiko to establish tunnel with lab-router
Message-ID: <000001cc7829$9d79f6f0$d86de4d0$@com>

Hello Friends,

 

I am looking to implement tunneling in python and using "Paramiko" for
this..

Sending theTunneling script using Paramiko -Python.

 

It's facing some prob, hangs on running the script..output message it says
".. Missing Handlers". Plz let me know the corrections to be done in this
script to making tunneling successful (I hv hard-coded the jump server IP
address 10.64.116.34 and password - "Cisco123" in the script to test it
once). It's urgent, plz giv me solution ASAP!!

 

Thanks n regards,

Vinay

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From k.sahithi2862 at gmail.com  Wed Sep 21 05:00:38 2011
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Subject: SOUTH INDIAN HOT ACTRESS
Message-ID: <41a22645-676f-4f95-852f-a6986d5efea1@h9g2000yqi.googlegroups.com>

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From Antoon.Pardon at rece.vub.ac.be  Wed Sep 21 05:25:02 2011
From: Antoon.Pardon at rece.vub.ac.be (Antoon Pardon)
Date: Wed, 21 Sep 2011 11:25:02 +0200
Subject: Killing threads (was Re: Cancel or timeout a long running
	regular expression)
In-Reply-To: <4E79791E.7000903@v.loewis.de>
References: <mailman.1242.1316295305.27778.python-list@python.org>
	<4E79791E.7000903@v.loewis.de>
Message-ID: <20110921092502.GF3410@trout.vub.ac.be>

On Wed, Sep 21, 2011 at 07:41:50AM +0200, Martin v. Loewis wrote:
> > Is it just that nobody's implemented it, or is there a good reason for
> > avoiding offering this sort of thing?
> 
> I've been considering to implement killing threads several times for the
> last 15 years (I think about it once every year), and every time
> I give up because it's too complex and just not implementable.
> 
> To start with, a simple flag in the thread won't do any good.

I don't agree. Now if you had written that it wouldn't solve all
problem, I could understand that. But I have been in circumstances
where a simple flag in the thread implementation would have been
helpfull.

>                                                               It will
> not cancel blocking system calls, so people will complain that the
> threads they meant to cancel continue to run forever. Instead, you
> have to use some facility to interrupt blocking system calls. You
> then have to convince callers of those blocking system calls not to
> retry when they see that the first attempt to call it was interrupted.
> And so on.

But this is no longer an implementation problem but a use problem. If
someone gets an IOError for writing on a closed pipe and he cathes the
exception and retries the write in a loop, then this a problem of the
author of this loop, not of exceptions.

So if one thread throws an exception to an other thread for instance to
indicate a timeout for the latter and the latter catches that exception
and tries again what it was doing in a loop, that is entirely the
problem of the author of that loop and not of the abilty of one thread
throwing an exception in an other.

Unless of course there may be a lot of such problematic loops within
the internal python code.

-- 
Antoon Pardon


From csf178 at 163.com  Wed Sep 21 05:44:52 2011
From: csf178 at 163.com (=?GBK?B?s8zbv7fH?=)
Date: Wed, 21 Sep 2011 17:44:52 +0800 (CST)
Subject: Where can I find a lexical spec of python?
Message-ID: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>

Hi, everyone, 
I've found there was several tokens used in python's grammar(http://docs.python.org/reference/grammar.html) but I didn't see their definition anywhere.  The tokens listed here: 
NEWLINE
ENDMARKER
NAME
INDENT
DEDENT
NUMBER
STRING


I've got some infomations from the source code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but I'm not sure which feature is only for this specified implementaion.  (I saw tabstop could be modified with comments using "tab-width:", ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
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From t at jollybox.de  Wed Sep 21 07:41:33 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 21 Sep 2011 13:41:33 +0200
Subject: Where can I find a lexical spec of python?
In-Reply-To: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
References: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
Message-ID: <4E79CD6D.2030206@jollybox.de>

On 21/09/11 11:44, ??? wrote:
> Hi, everyone, 
> I've found there was several tokens used in python's
> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
> their definition anywhere.  The tokens listed here: 

They should be documented in
http://docs.python.org/py3k/reference/lexical_analysis.html - though
apparently not using these exact terms.

> NEWLINE
Trivial: U+000A

> ENDMARKER
End of file.

> NAME
documented as "identifier" in 2.3

> INDENT
> DEDENT
Documented in 2.1.8.

> NUMBER
Documented in 2.4.3 - 2.4.6

> STRING
Documented in 2.4.2

> I've got some infomations from the source
> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
> I'm not sure which feature is only for this specified implementaion.  (I
> saw tabstop could be modified with comments using "tab-width:",
> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)

That sounds like a legacy feature that is no longer used. Somebody
familiar with the early history of Python might be able to shed more
light on the situation. It is inconsisten with the spec (section 2.1.8):

"""
Indentation is rejected as inconsistent if a source file mixes tabs and
spaces in a way that makes the meaning dependent on the worth of a tab
in spaces; a TabError is raised in that case.
"""

- Thomas


From info at wingware.com  Wed Sep 21 10:15:14 2011
From: info at wingware.com (Wingware)
Date: Wed, 21 Sep 2011 10:15:14 -0400
Subject: Wing IDE 4.0.4 released
Message-ID: <4E79F172.3070106@wingware.com>

Hi,

Wingware has released version 4.0.4 of Wing IDE, an integrated development
environment designed specifically for the Python programming language.

Wing IDE is a cross-platform Python IDE that provides a professional code
editor with vi, emacs, and other key bindings, auto-completion, call tips,
refactoring, a powerful graphical debugger, version control, unit testing,
search, and many other features.

**Changes in Version 4.0.4**

This is a maintenance release with the following changes:

* Shell history operates on whole blocks and filters by entered prefix
* Auto-editing (must be enabled with Editor > Auto-Editing preferences):
   * Auto-enter closing quotes, comments, and parentheses, braces, etc
   * Tab through auto-entered invocation arguments
   * Apply quote, comment character, or parenthesis to selection
* Use dynamic analysis for goto-definition in the editor, when available
* Support ## comments and new block syntax in Mako files
* Allow scrolling editor one page below the last line
* Refactoring can move symbols to a new file
* PyLint panel improvements, including support for version 0.23+
* Commands to copy editor and project file names to clipboard
* About 70 other minor features and bug fixes included vi mode improvements

See the change log for details.

**New Features in Version 4.0**

Version 4.0 adds the following new major features:

* Refactoring -- Rename/move symbols, extract to function/method, and 
introduce variable
* Find Uses -- Find all points of use of a symbol
* Diff/Merge -- Graphical file and repository comparison and merge
* Django Support -- Debug Django templates, run Django unit tests, and more
* matplotlib Support -- Maintains live-updating plots in shell and debugger
* Simplified Licensing -- Includes all OSes and adds Support+Upgrades 
subscriptions

Complete change log:           
http://wingware.com/pub/wingide/4.0.4/CHANGELOG.txt
Details on licensing changes:  http://wingware.com/news/2011-02-16

**About Wing IDE**

Wing IDE is an integrated development environment designed specifically for
the Python programming language.  It provides powerful editing, testing, and
debugging features that help reduce development and debugging time, cut down
on coding errors, and make it easier to understand and navigate Python code.
Wing IDE can be used to develop Python code for web, GUI, and embedded
scripting applications.

Wing IDE is available in three product levels:  Wing IDE Professional is
the full-featured Python IDE, Wing IDE Personal offers a reduced feature
set at a low price, and Wing IDE 101 is a free simplified version designed
for teaching beginning programming courses with Python.

Version 4.0 of Wing IDE Professional includes the following major features:

* Professional quality code editor with vi, emacs, and other keyboard
   personalities
* Code intelligence for Python:  Auto-completion, call tips, find uses,
   goto-definition, error indicators, refactoring, smart indent and 
rewrapping,
   and source navigation
* Advanced multi-threaded debugger with graphical UI, command line 
interaction,
   conditional breakpoints, data value tooltips over code, watch tool, and
   externally launched and remote debugging
* Powerful search and replace options including keyboard driven and 
graphical
   UIs, multi-file, wild card, and regular expression search and replace
* Version control integration for Subversion, CVS, Bazaar, git, 
Mercurial, and
   Perforce
* Integrated unit testing with unittest, nose, and doctest frameworks
* Django support:  Debugs Django templates, provides project setup tools,
   and runs Django unit tests
* Many other features including project manager, bookmarks, code snippets,
   diff/merge tool, OS command integration, indentation manager, PyLint
   integration, and perspectives
* Extremely configurable and may be extended with Python scripts
* Extensive product documentation and How-Tos for Django, matplotlib,
   Plone, wxPython, PyQt, mod_wsgi, Autodesk Maya, and many other frameworks

Please refer to http://wingware.com/wingide/features for a detailed listing
of features by product level.

System requirements are Windows 2000 or later, OS X 10.3.9 or later 
(requires
X11 Server), or a recent Linux system (either 32 or 64 bit).  Wing IDE 
supports
Python versions 2.0.x through 3.2.x and Stackless Python.

For more information, see the http://wingware.com/

**Downloads**

Wing IDE Professional and Wing IDE Personal are commercial software and
require a license to run. A free trial can be obtained directly from the
product when launched.

Wing IDE Pro -- Full-featured product:
http://wingware.com/downloads/wingide/4.0

Wing IDE Personal -- A simplified IDE:
http://wingware.com/downloads/wingide-personal/4.0

Wing IDE 101 -- For teaching with Python:
http://wingware.com/downloads/wingide-101/4.0

**Purchasing and Upgrading**

Wing 4.0 requires an upgrade for Wing IDE 2.x and 3.x users at a cost of
1/2 the full product pricing.

Upgrade a license:       https://wingware.com/store/upgrade
Purchase a new license:  https://wingware.com/store/purchase

Optional Support+Upgrades subscriptions are available for expanded
support coverage and free upgrades to new major releases:

http://wingware.com/support/agreement

Thanks!

-- 

The Wingware Team
Wingware | Python IDE
Advancing Software Development

www.wingware.com



From frank.ruiz at gmail.com  Wed Sep 21 11:44:13 2011
From: frank.ruiz at gmail.com (Frank Ruiz)
Date: Wed, 21 Sep 2011 08:44:13 -0700
Subject: Graphing
Message-ID: <CAARSQBfcSQSDKY+m-V6-iikUdOuTq4Zb=kr6_2HFdxtWhg-5NA@mail.gmail.com>

I am looking to plot some data points related to system metrics.
Benchmarking, etc. Can someone give some recommendations on a good way
to graph these datapoints in python. I started looking into
matplotlib, however was interested in others experiences.


From invalid at invalid.invalid  Wed Sep 21 12:27:32 2011
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 21 Sep 2011 16:27:32 +0000 (UTC)
Subject: Graphing
References: <mailman.1328.1316619856.27778.python-list@python.org>
Message-ID: <j5d39k$spn$1@reader1.panix.com>

On 2011-09-21, Frank Ruiz <frank.ruiz at gmail.com> wrote:

> I am looking to plot some data points related to system metrics.
> Benchmarking, etc. Can someone give some recommendations on a good
> way to graph these datapoints in python. I started looking into
> matplotlib, however was interested in others experiences.

I've always liked gnuplot-py, but I was a gnuplot user for 10+ years
before I started using Python.  If you don't already know how to use
gnuplot, then perhaps gnuplot-py might not seem as intuitive.

http://gnuplot-py.sourceforge.net/

-- 
Grant Edwards               grant.b.edwards        Yow! Hmmm ... an arrogant
                                  at               bouquet with a subtle
                              gmail.com            suggestion of POLYVINYL
                                                   CHLORIDE ...


From ppearson at nowhere.invalid  Wed Sep 21 12:28:34 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 21 Sep 2011 16:28:34 GMT
Subject: Graphing
References: <mailman.1328.1316619856.27778.python-list@python.org>
Message-ID: <9duhliFopmU1@mid.individual.net>

On Wed, 21 Sep 2011 08:44:13 -0700, Frank Ruiz <frank.ruiz at gmail.com> wrote:
> I am looking to plot some data points related to system metrics.
> Benchmarking, etc. Can someone give some recommendations on a good way
> to graph these datapoints in python. I started looking into
> matplotlib, however was interested in others experiences.

I like biggles. Reasonably straightforward, well defaulted.
Simple plots require only simple code.

biggles.sourceforge.net

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


From csf178 at 163.com  Wed Sep 21 12:33:03 2011
From: csf178 at 163.com (=?utf-8?B?56iL5Yqt6Z2e?=)
Date: Thu, 22 Sep 2011 00:33:03 +0800 (CST)
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4E79CD6D.2030206@jollybox.de>
References: <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
Message-ID: <4521e081.ded3.1328cd55581.Coremail.csf178@163.com>

Thanks Thomas.
I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html 

but I worried it might leak some language features like "tab magic".

For I'm working on a parser with JavaScript I need a more strictly defined spec. 

Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
(Also the lexer  http://shaofei.name/python/PyLexer.html)

As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.

Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?

Please help me. Thanks a lot.
? 2011-09-21 19:41:33?"Thomas Jollans" <t at jollybox.de> ???
>On 21/09/11 11:44, ??? wrote:
>> Hi, everyone, 
>> I've found there was several tokens used in python's
>> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
>> their definition anywhere.  The tokens listed here: 
>
>They should be documented in
>http://docs.python.org/py3k/reference/lexical_analysis.html - though
>apparently not using these exact terms.
>
>> NEWLINE
>Trivial: U+000A
>
>> ENDMARKER
>End of file.
>
>> NAME
>documented as "identifier" in 2.3
>
>> INDENT
>> DEDENT
>Documented in 2.1.8.
>
>> NUMBER
>Documented in 2.4.3 - 2.4.6
>
>> STRING
>Documented in 2.4.2
>
>> I've got some infomations from the source
>> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
>> I'm not sure which feature is only for this specified implementaion.  (I
>> saw tabstop could be modified with comments using "tab-width:",
>> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
>
>That sounds like a legacy feature that is no longer used. Somebody
>familiar with the early history of Python might be able to shed more
>light on the situation. It is inconsisten with the spec (section 2.1.8):
>
>"""
>Indentation is rejected as inconsistent if a source file mixes tabs and
>spaces in a way that makes the meaning dependent on the worth of a tab
>in spaces; a TabError is raised in that case.
>"""
>
>- Thomas
>-- 
>http://mail.python.org/mailman/listinfo/python-list



From clp2 at rebertia.com  Wed Sep 21 12:53:57 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 21 Sep 2011 09:53:57 -0700
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
References: <a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4E79CD6D.2030206@jollybox.de>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
Message-ID: <CAMZYqRTnQ7GO0vTXOa-1TcUuE9Ar19jMMjwiWg55Up4oWhTiHg@mail.gmail.com>

On Wed, Sep 21, 2011 at 9:33 AM, ??? <csf178 at 163.com> wrote:
> Thanks Thomas.
> I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html
>
> but I worried it might leak some language features like "tab magic".
>
> For I'm working on a parser with JavaScript I need a more strictly defined spec.
>
> Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
> (Also the lexer ?http://shaofei.name/python/PyLexer.html)
>
> As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.
>
> Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?

Closest thing would be http://docs.python.org/py3k/reference/grammar.html

Cheers,
Chris


From t at jollybox.de  Wed Sep 21 12:55:45 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 21 Sep 2011 18:55:45 +0200
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
References: <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
Message-ID: <4E7A1711.8000007@jollybox.de>

On 21/09/11 18:33, ??? wrote:
> Thanks Thomas.
> I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html 
> 
> but I worried it might leak some language features like "tab magic".
> 
> For I'm working on a parser with JavaScript I need a more strictly defined spec. 
> 
> Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
> (Also the lexer  http://shaofei.name/python/PyLexer.html)
> 
> As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.
> 
> Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?

I believe the language documentation on docs.python.org is all the
documentation of the language there is. It may not be completely formal,
and in parts it concentrates not on the actual rules but on the original
implementation, but, as far as I can tell, it tells you everything you
need to know to write a new parser for the Python language, without any
ambiguity.

You appear to be anxious about implementing the indentation mechanism
correctly. The language documentation describes a behaviour precisely.
What is the problem?

Thomas

> 
> Please help me. Thanks a lot.
> ? 2011-09-21 19:41:33?"Thomas Jollans" <t at jollybox.de> ???
>> On 21/09/11 11:44, ??? wrote:
>>> Hi, everyone, 
>>> I've found there was several tokens used in python's
>>> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
>>> their definition anywhere.  The tokens listed here: 
>>
>> They should be documented in
>> http://docs.python.org/py3k/reference/lexical_analysis.html - though
>> apparently not using these exact terms.
>>
>>> NEWLINE
>> Trivial: U+000A
>>
>>> ENDMARKER
>> End of file.
>>
>>> NAME
>> documented as "identifier" in 2.3
>>
>>> INDENT
>>> DEDENT
>> Documented in 2.1.8.
>>
>>> NUMBER
>> Documented in 2.4.3 - 2.4.6
>>
>>> STRING
>> Documented in 2.4.2
>>
>>> I've got some infomations from the source
>>> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
>>> I'm not sure which feature is only for this specified implementaion.  (I
>>> saw tabstop could be modified with comments using "tab-width:",
>>> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
>>
>> That sounds like a legacy feature that is no longer used. Somebody
>> familiar with the early history of Python might be able to shed more
>> light on the situation. It is inconsisten with the spec (section 2.1.8):
>>
>> """
>> Indentation is rejected as inconsistent if a source file mixes tabs and
>> spaces in a way that makes the meaning dependent on the worth of a tab
>> in spaces; a TabError is raised in that case.
>> """
>>
>> - Thomas
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
> 



From dickinsm at gmail.com  Wed Sep 21 13:03:15 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 21 Sep 2011 10:03:15 -0700 (PDT)
Subject: Operator commutativity
References: <j5781l$opq$1@speranza.aioe.org>
	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>
	<j5797e$s57$1@speranza.aioe.org>
	<roy-C1FD55.08102719092011@news.panix.com>
	<mailman.1283.1316436548.27778.python-list@python.org>
	<9drvinFngaU1@mid.individual.net>
	<mailman.1311.1316545829.27778.python-list@python.org>
	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <2f4e4d92-a1c9-4aaa-affa-d21e41f82774@w28g2000yqw.googlegroups.com>

On Sep 21, 2:07?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> After playing around with various combinations of C1, C2, D1 and D2, it
> seems to me that the rule is:
>
> If the right-hand argument is a subclass of the left-hand argument, AND also
> defines __radd__ directly rather than inheriting it, then its __radd__
> method is called before the left-hand argument's __add__ method.
>
> which strikes me as a strangely specific and not very useful rule. I suspect
> it might be an accident of implementation rather than a deliberate feature.

I'm 99.9% sure it's deliberate rather than an accident of
implementation.  See the note in the docs at:

http://docs.python.org/reference/datamodel.html#emulating-numeric-types

Support that you're subclassing int, (class MyInt(int): ...) and you
want to intercept additions of the form 3 + MyInt(4)  (perhaps because
you want MyInt to be 'contagious', so that an arithmetic operation
that combines an int and a MyInt returns a MyInt).  How would you
achieve this without this rule?

--
Mark


From csf178 at 163.com  Wed Sep 21 14:01:14 2011
From: csf178 at 163.com (Shaofei Cheng)
Date: Thu, 22 Sep 2011 02:01:14 +0800 (CST)
Subject: Where can I find a lexical spec of python?
In-Reply-To: <4E7A1711.8000007@jollybox.de>
References: <4E7A1711.8000007@jollybox.de> <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
Message-ID: <33db1987.e15d.1328d260e2f.Coremail.csf178@163.com>

Yes, I'm using this document now but I was wondering if there is a formal spec for lexical grammar?  It looks like some part of the doc "http://docs.python.org/py3k/reference/grammar.html"  is missing. 
We can find some replacement in lexical_analysis.html but it seems this document is write for a python user instead of a guy trying to implement python.
? 2011-09-22 00:55:45?"Thomas Jollans" <t at jollybox.de> ???
>On 21/09/11 18:33, ??? wrote:
>> Thanks Thomas.
>> I've read the document http://docs.python.org/py3k/reference/lexical_analysis.html 
>> 
>> but I worried it might leak some language features like "tab magic".
>> 
>> For I'm working on a parser with JavaScript I need a more strictly defined spec. 
>> 
>> Currently I have a highlighter here ->http://shaofei.name/python/PyHighlighter.html
>> (Also the lexer  http://shaofei.name/python/PyLexer.html)
>> 
>> As you can see, I just make its behavior align with CPython, but I'm not sure what the real python lexical grammar is like.
>> 
>> Does anyone know if there is a lexical grammar spec like other languages(e.g. http://bclary.com/2004/11/07/#annex-a)?
>
>I believe the language documentation on docs.python.org is all the
>documentation of the language there is. It may not be completely formal,
>and in parts it concentrates not on the actual rules but on the original
>implementation, but, as far as I can tell, it tells you everything you
>need to know to write a new parser for the Python language, without any
>ambiguity.
>
>You appear to be anxious about implementing the indentation mechanism
>correctly. The language documentation describes a behaviour precisely.
>What is the problem?
>
>Thomas
>
>> 
>> Please help me. Thanks a lot.
>> ? 2011-09-21 19:41:33?"Thomas Jollans" <t at jollybox.de> ???
>>> On 21/09/11 11:44, ??? wrote:
>>>> Hi, everyone, 
>>>> I've found there was several tokens used in python's
>>>> grammar(http://docs.python.org/reference/grammar.html) but I didn't see
>>>> their definition anywhere.  The tokens listed here: 
>>>
>>> They should be documented in
>>> http://docs.python.org/py3k/reference/lexical_analysis.html - though
>>> apparently not using these exact terms.
>>>
>>>> NEWLINE
>>> Trivial: U+000A
>>>
>>>> ENDMARKER
>>> End of file.
>>>
>>>> NAME
>>> documented as "identifier" in 2.3
>>>
>>>> INDENT
>>>> DEDENT
>>> Documented in 2.1.8.
>>>
>>>> NUMBER
>>> Documented in 2.4.3 - 2.4.6
>>>
>>>> STRING
>>> Documented in 2.4.2
>>>
>>>> I've got some infomations from the source
>>>> code(http://svn.python.org/projects/python/trunk/Parser/tokenizer.c) but
>>>> I'm not sure which feature is only for this specified implementaion.  (I
>>>> saw tabstop could be modified with comments using "tab-width:",
>>>> ":tabstop=", ":ts=" or "set tabsize=", is this feature really in spec?)
>>>
>>> That sounds like a legacy feature that is no longer used. Somebody
>>> familiar with the early history of Python might be able to shed more
>>> light on the situation. It is inconsisten with the spec (section 2.1.8):
>>>
>>> """
>>> Indentation is rejected as inconsistent if a source file mixes tabs and
>>> spaces in a way that makes the meaning dependent on the worth of a tab
>>> in spaces; a TabError is raised in that case.
>>> """
>>>
>>> - Thomas
>>> -- 
>>> http://mail.python.org/mailman/listinfo/python-list
>> 
>



From ethan at stoneleaf.us  Wed Sep 21 14:15:56 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 21 Sep 2011 11:15:56 -0700
Subject: Operator commutativity
In-Reply-To: <2f4e4d92-a1c9-4aaa-affa-d21e41f82774@w28g2000yqw.googlegroups.com>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>	<9drvinFngaU1@mid.individual.net>	<mailman.1311.1316545829.27778.python-list@python.org>	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
	<2f4e4d92-a1c9-4aaa-affa-d21e41f82774@w28g2000yqw.googlegroups.com>
Message-ID: <4E7A29DC.2060205@stoneleaf.us>

Mark Dickinson wrote:
> On Sep 21, 2:07 am, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
>> After playing around with various combinations of C1, C2, D1 and D2, it
>> seems to me that the rule is:
>>
>> If the right-hand argument is a subclass of the left-hand argument, AND also
>> defines __radd__ directly rather than inheriting it, then its __radd__
>> method is called before the left-hand argument's __add__ method.
>>
>> which strikes me as a strangely specific and not very useful rule. I suspect
>> it might be an accident of implementation rather than a deliberate feature.
> 
> I'm 99.9% sure it's deliberate rather than an accident of
> implementation.  See the note in the docs at:
> 
> http://docs.python.org/reference/datamodel.html#emulating-numeric-types
> 
> Support that you're subclassing int, (class MyInt(int): ...) and you
> want to intercept additions of the form 3 + MyInt(4)  (perhaps because
> you want MyInt to be 'contagious', so that an arithmetic operation
> that combines an int and a MyInt returns a MyInt).  How would you
> achieve this without this rule?

I think Steven's objection was in not calling subclass.__radd__ when 
__radd__ is inherited rather than directly overridden.  Interestingly 
enough, the following works as expected (at least, as I expected ;)...

class C1(object):
      def __add__(self, other):
          print "C1.__add__(%r, %r)" % (self, other)

class C2(C1):
      def __radd__(self, other):
          print "C2.__radd__(%r, %r)" % (self, other)

class C3(C2):
     pass

C1() + C2()  # --> C2.__radd__(<...C2...>, <...C1...)
C1() + C3()  # --> C2.__radd__(<...C3...>, <...C1...>)
C2() + C3()  # --> C1.__add__(<...C2...>, <...C3...>)


~Ethan~


From t at jollybox.de  Wed Sep 21 14:22:27 2011
From: t at jollybox.de (Thomas Jollans)
Date: Wed, 21 Sep 2011 20:22:27 +0200
Subject: Where can I find a lexical spec of python?
In-Reply-To: <33db1987.e15d.1328d260e2f.Coremail.csf178@163.com>
References: <4E7A1711.8000007@jollybox.de> <4E79CD6D.2030206@jollybox.de>
	<a2157b.6c51.1328b5f9ee3.Coremail.csf178@163.com>
	<4521e081.ded3.1328cd55581.Coremail.csf178@163.com>
	<33db1987.e15d.1328d260e2f.Coremail.csf178@163.com>
Message-ID: <4E7A2B63.4030505@jollybox.de>

On 21/09/11 20:01, Shaofei Cheng wrote:
> Yes, I'm using this document now but I was wondering if there is a formal spec for lexical grammar?  It looks like some part of the doc "http://docs.python.org/py3k/reference/grammar.html"  is missing. 
> We can find some replacement in lexical_analysis.html but it seems this document is write for a python user instead of a guy trying to implement python.

Yes, I understood alright what you were asking. As I said, I don't
believe there is any more formal documentation of the Python language
than what you have already seen. However, I am of the opinion that it
gives you all the information you need, and that a complete formal
grammar, while perhaps, for you, easier to interpret, would not add any
information.

Thomas





From ethan at stoneleaf.us  Wed Sep 21 15:11:12 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 21 Sep 2011 12:11:12 -0700
Subject: Operator commutativity
In-Reply-To: <4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
References: <j5781l$opq$1@speranza.aioe.org>	<87hb48ixmj.fsf@no-fixed-abode.cable.virginmedia.net>	<j5797e$s57$1@speranza.aioe.org>	<roy-C1FD55.08102719092011@news.panix.com>	<mailman.1283.1316436548.27778.python-list@python.org>	<9drvinFngaU1@mid.individual.net>	<mailman.1311.1316545829.27778.python-list@python.org>
	<4e7938c4$0$29969$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7A36D0.6030603@stoneleaf.us>

Steven D'Aprano wrote:
> After playing around with various combinations of C1, C2, D1 and D2, it
> seems to me that the rule is:
> 
> If the right-hand argument is a subclass of the left-hand argument, AND also
> defines __radd__ directly rather than inheriting it, then its __radd__
> method is called before the left-hand argument's __add__ method.
> 
> 
> which strikes me as a strangely specific and not very useful rule. I suspect
> it might be an accident of implementation rather than a deliberate feature.

Update to rule:

If the right-hand argument is a subclass of the left-hand argument AND a 
__radd__ is defined anywhere between the left-hand argument's class up 
to and including the right-hand argument's class, then __radd__ is 
called, otherwise the left-hand arguments __add__ is called.

And it makes perfect sense -- a + b is, after all, an __add__ function; 
the only reason to call __radd__ instead is if it has been defined for a 
subclass, and the only reason to define it is because it needs something 
different from a + b that a doesn't know about.

Probably not a clear explanation -- maybe somebody else can dress it up 
a bit.

~Ethan~


From arnodel at gmail.com  Wed Sep 21 18:04:18 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 21 Sep 2011 23:04:18 +0100
Subject: About MAKE_FUNCTION opcode in Python 3
In-Reply-To: <j5bkhc$9ld$1@dough.gmane.org>
References: <CAJ6cK1bFP1nHJB3FEY8uq=oHviVHzhqBBo_qr3RqkuY8QwnSHg@mail.gmail.com>
	<CALFfu7CvnkmP+md4k6J3jXcT=cMobzP9cguT-dGVpsa+M56syA@mail.gmail.com>
	<j5bkhc$9ld$1@dough.gmane.org>
Message-ID: <CAJ6cK1Y3E3cLaANJhvMk7_Lgsyi5xZpqbktBcJ2=3RPO8yKtsA@mail.gmail.com>

On 21 September 2011 04:09, Terry Reedy <tjreedy at udel.edu> wrote:

> I agree that doc should be updated for 3.x. Please suggest a new working if
> you can, as well as copying the source snippet above. Add me terry.reedy as
> nosy.

Done: http://bugs.python.org/issue13026

-- 
Arnaud


From missive at hotmail.com  Wed Sep 21 21:35:44 2011
From: missive at hotmail.com (Lee Harr)
Date: Thu, 22 Sep 2011 06:05:44 +0430
Subject: [ANNC] pynguin-0.12  (fixes problems running on Windows)
Message-ID: <SNT106-W3945FF0EF2AD05CC9055AAB10C0@phx.gbl>


Pynguin is a python-based turtle graphics application.
??? It combines an editor, interactive interpreter, and
??? graphics display area.

It is meant to be an easy environment for introducing
??? some programming concepts to beginning programmers.


http://pynguin.googlecode.com/


This release fixes problems which prevented the program
??? from working properly on Windows systems.


Pynguin is tested with Python 2.7.1 and PyQt 4.8.3 and
??? will use Pygments syntax highlighting if available.

Pynguin is released under GPLv3.


Changes in pynguin-0.12:
??? Important fixes
??????? - Fixed menu items and dialogs not working on Windows
??????? - Fixed error on Windows when trying to write backup files

??? Pynguin API
??????? - bgcolor()
??????? - raise exception if using color component outside of 0-255
??????? - make util.nudge_color() API match util.choose_color()

??? Canvas
??????? - allow setting background color
??????? - fix custom svg avatars to allow any size avatar

??? Integrated Editor
??????? - comment / uncomment line / region

??? Integrated Console
??????? - added command to clear history
??????? - clears line before writing commands selected in menu

??? Examples
??????? - added fractals example file

 		 	   		  


From bahamutzero8825 at gmail.com  Wed Sep 21 21:53:04 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Wed, 21 Sep 2011 20:53:04 -0500
Subject: Odd behavior with imp.reload and logging
Message-ID: <4E7A9500.2070101@gmail.com>

When using a logger in a module and then using imp.reload to reload the
module, logger messages are repeated in direct proportion to the number
of times the modules was loaded. That is, on the first import, the
message is written once, but on the second run, each message is written
twice, three times on the third run, and so on.

With this code:

> import logging
> 
> test_logger = logging.getLogger(__name__)
> console_handler = logging.StreamHandler()
> console_formatter = logging.Formatter('{asctime} - {module} - {funcName} - line {lineno} - {levelname} - {message}', style='{')
> console_handler.setFormatter(console_formatter)
> test_logger.addHandler(console_handler)
> test_logger.setLevel(logging.DEBUG)
> 
> test_logger.info('Test info')

I get this in the interpreter:

> Python 3.2.2 (default, Sep  4 2011, 09:07:29) [MSC v.1500 64 bit (AMD64)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import os, imp
>>>> import test2
> 2011-09-21 20:51:02,421 - test2 - <module> - line 11 - INFO - Test info
>>>> imp.reload(test2)
> 2011-09-21 20:51:10,665 - test2 - <module> - line 11 - INFO - Test info
> 2011-09-21 20:51:10,665 - test2 - <module> - line 11 - INFO - Test info
> <module 'test2' from 'test2.py'>


What causes this, and how can I fix it (or at least work around it)? Due
to the nature of the program, it's much more convenient to reload a
module than to restart the entire program (especially when testing).

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2
PGP/GPG Public Key ID: 0xF88E034060A78FCB


From rosuav at gmail.com  Wed Sep 21 21:57:42 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 11:57:42 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7A9500.2070101@gmail.com>
References: <4E7A9500.2070101@gmail.com>
Message-ID: <CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>

On Thu, Sep 22, 2011 at 11:53 AM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> What causes this, and how can I fix it (or at least work around it)? Due
> to the nature of the program, it's much more convenient to reload a
> module than to restart the entire program (especially when testing).
>

Unfortunately, Python doesn't really like modules to be reloaded. Are
you able to explicitly close the logger before reloading?

ChrisA


From bahamutzero8825 at gmail.com  Wed Sep 21 22:44:20 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Wed, 21 Sep 2011 21:44:20 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>
References: <4E7A9500.2070101@gmail.com>
	<CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>
Message-ID: <4E7AA104.7050009@gmail.com>

On 2011.09.21 08:57 PM, Chris Angelico wrote:
> Unfortunately, Python doesn't really like modules to be reloaded. Are
> you able to explicitly close the logger before reloading?
The reload isn't controlled by the module, but I have no problem
clearing out any loggers at the beginning. I'm looking through the
logging docs, but I don't see what you mean by explicitly closing the
logger. Handler.close() doesn't help.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From rosuav at gmail.com  Wed Sep 21 22:48:04 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 12:48:04 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7AA104.7050009@gmail.com>
References: <4E7A9500.2070101@gmail.com>
	<CAPTjJmopurDiicRPLW46zs+DDqEvMgXvkkX6KeZjP0g5r4fVkw@mail.gmail.com>
	<4E7AA104.7050009@gmail.com>
Message-ID: <CAPTjJmpPC96hKZTbzxzVbC7cx1nQ1T8c6UhXr7YM-BG7n5ELUg@mail.gmail.com>

On Thu, Sep 22, 2011 at 12:44 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> The reload isn't controlled by the module, but I have no problem
> clearing out any loggers at the beginning.

I'm thinking more along the lines of closing them in the old module
before firing imp.reload() - maybe have a function in the module that
cleans itself up and then reloads itself. And yes, I had been thinking
of closing the handler, but I don't know the logging module much.

ChrisA


From atherun at gmail.com  Wed Sep 21 23:09:05 2011
From: atherun at gmail.com (Atherun)
Date: Wed, 21 Sep 2011 20:09:05 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
Message-ID: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>

This is on windows with python 2.6.
I can't seem to remove a possibility of a  deadlock in one of my
scripts at the moment.  Its not a constant deadlock but it appears
from time to time.  The code is below:

try:

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

        NotDone = True
        data = []
        while NotDone:
            NotDone = False

            result = process.poll()
            if result == None:
                NotDone = True
            if NotDone:
                out, err = process.communicate()
                Log(out)

I was able to get the program to write out the stack trace for my
threads and it is usually deadlocked on sys.stdout.read or
_internal_poll of subproceess.

I've even tried the above, with using "with
tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
it still deadlocks.  In the past I work around this by running fewer
processes asynchronously but I would really like to get this solved so
I don't have to wait to see if it'll be caused with any changes I
make.

Any tips would be appreciated.


From roy at panix.com  Wed Sep 21 23:32:19 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 21 Sep 2011 23:32:19 -0400
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
Message-ID: <roy-E8A301.23321921092011@news.panix.com>

In article 
<098f3d78-85f5-44e7-ba72-f2270a24d1b0 at o9g2000vbo.googlegroups.com>,
 Atherun <atherun at gmail.com> wrote:

> This is on windows with python 2.6.
> I can't seem to remove a possibility of a  deadlock in one of my
> scripts at the moment.  Its not a constant deadlock but it appears
> from time to time.  The code is below:
> 
> try:
> 
>         process =
> subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
> 
>         NotDone = True
>         data = []
>         while NotDone:
>             NotDone = False
> 
>             result = process.poll()
>             if result == None:
>                 NotDone = True
>             if NotDone:
>                 out, err = process.communicate()
>                 Log(out)
> 
> I was able to get the program to write out the stack trace for my
> threads and it is usually deadlocked on sys.stdout.read or
> _internal_poll of subproceess.
> 
> I've even tried the above, with using "with
> tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
> it still deadlocks.  In the past I work around this by running fewer
> processes asynchronously but I would really like to get this solved so
> I don't have to wait to see if it'll be caused with any changes I
> make.
> 
> Any tips would be appreciated.

My reading of the docs 
(http://docs.python.org/release/2.6.7/library/subprocess.html#popen-objec
ts) says that Popen.poll() doesn't return a value, it sets the object's 
return code attribute, which you can then interrogate.

More than that, your loop logic looks amazingly complicated for what's 
basically a simple thing.  I suggest something along the lines of:

   # assuming process.returncode is initially None 
   while process.returncode is None:
      out, err = process.communicate()
      Log(out)

I haven't tested that, but I think (from reading the docs) that's the 
right idea.


From clp2 at rebertia.com  Wed Sep 21 23:33:37 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 21 Sep 2011 20:33:37 -0700
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
Message-ID: <CAMZYqRT_Dw_dBCas+UyKjYLf7BdDCMQrqDygFubDJqP0TeFxTQ@mail.gmail.com>

On Wed, Sep 21, 2011 at 8:09 PM, Atherun <atherun at gmail.com> wrote:
> This is on windows with python 2.6.
> I can't seem to remove a possibility of a ?deadlock in one of my
> scripts at the moment. ?Its not a constant deadlock but it appears
> from time to time. ?The code is below:
>
> try:
>
> ? ? ? ?process =
> subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
>
> ? ? ? ?NotDone = True
> ? ? ? ?data = []
> ? ? ? ?while NotDone:
> ? ? ? ? ? ?NotDone = False
>
> ? ? ? ? ? ?result = process.poll()
> ? ? ? ? ? ?if result == None:
> ? ? ? ? ? ? ? ?NotDone = True
> ? ? ? ? ? ?if NotDone:
> ? ? ? ? ? ? ? ?out, err = process.communicate()
> ? ? ? ? ? ? ? ?Log(out)
>
> I was able to get the program to write out the stack trace for my
> threads and it is usually deadlocked on sys.stdout.read or
> _internal_poll of subproceess.
>
> I've even tried the above, with using "with
> tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
> it still deadlocks. ?In the past I work around this by running fewer
> processes asynchronously but I would really like to get this solved so
> I don't have to wait to see if it'll be caused with any changes I
> make.
>
> Any tips would be appreciated.

Your polling loop is completely pointless. The code can be simplified to:

process = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
out, err = process.communicate()
log(out)

Depending on the particular program you're running in a subprocess,
you may need to take heed of the Note in the communicate() docs:
"Note: The data read is buffered in memory, so *do not use this
method* if the data size is large or unlimited." [Emphasis added]

Cheers,
Chris
--
http://rebertia.com


From atherun at gmail.com  Wed Sep 21 23:42:53 2011
From: atherun at gmail.com (Atherun)
Date: Wed, 21 Sep 2011 20:42:53 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
Message-ID: <5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>

On Sep 21, 8:33?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Wed, Sep 21, 2011 at 8:09 PM, Atherun <athe... at gmail.com> wrote:
> > This is on windows with python 2.6.
> > I can't seem to remove a possibility of a ?deadlock in one of my
> > scripts at the moment. ?Its not a constant deadlock but it appears
> > from time to time. ?The code is below:
>
> > try:
>
> > ? ? ? ?process =
> > subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
>
> > ? ? ? ?NotDone = True
> > ? ? ? ?data = []
> > ? ? ? ?while NotDone:
> > ? ? ? ? ? ?NotDone = False
>
> > ? ? ? ? ? ?result = process.poll()
> > ? ? ? ? ? ?if result == None:
> > ? ? ? ? ? ? ? ?NotDone = True
> > ? ? ? ? ? ?if NotDone:
> > ? ? ? ? ? ? ? ?out, err = process.communicate()
> > ? ? ? ? ? ? ? ?Log(out)
>
> > I was able to get the program to write out the stack trace for my
> > threads and it is usually deadlocked on sys.stdout.read or
> > _internal_poll of subproceess.
>
> > I've even tried the above, with using "with
> > tempfile.NamedTemporaryFiles() as buff:" and writing to the file, but
> > it still deadlocks. ?In the past I work around this by running fewer
> > processes asynchronously but I would really like to get this solved so
> > I don't have to wait to see if it'll be caused with any changes I
> > make.
>
> > Any tips would be appreciated.
>
> Your polling loop is completely pointless. The code can be simplified to:
>
> process = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
> out, err = process.communicate()
> log(out)
>
> Depending on the particular program you're running in a subprocess,
> you may need to take heed of the Note in the communicate() docs:
> "Note: The data read is buffered in memory, so *do not use this
> method* if the data size is large or unlimited." [Emphasis added]
>
> Cheers,
> Chris
> --http://rebertia.com

I'm pretty sure thats the problem, this is a generic catch all
function for running subprocesses.  It can be anything to a simple
command to a complex command with a ton of output.  I'm looking for a
better solution to handle the case of running subprocesses that have
an undetermined amount of output. (i.e. p4 edit's or tools that have
an excessive amount of logging)

I'll definitely simplify the loop, thanks for the tip on that part.


From clp2 at rebertia.com  Wed Sep 21 23:52:02 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 21 Sep 2011 20:52:02 -0700
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <roy-E8A301.23321921092011@news.panix.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<roy-E8A301.23321921092011@news.panix.com>
Message-ID: <CAMZYqRRvZjkHDdafwyf758fFo=vbT=ORP-2iqiLb-o4qaCqM2Q@mail.gmail.com>

On Wed, Sep 21, 2011 at 8:32 PM, Roy Smith <roy at panix.com> wrote:
<snip>
> My reading of the docs
> (http://docs.python.org/release/2.6.7/library/subprocess.html#popen-objec
> ts) says that Popen.poll() doesn't return a value, it sets the object's
> return code attribute, which you can then interrogate.

Popen.poll():
    Check if child process has terminated. Set **and return**
returncode attribute.
[Direct quote from the docs; emphasis added]

> More than that, your loop logic looks amazingly complicated for what's
> basically a simple thing. ?I suggest something along the lines of:
>
> ? # assuming process.returncode is initially None
> ? while process.returncode is None:
> ? ? ?out, err = process.communicate()
> ? ? ?Log(out)
>
> I haven't tested that, but I think (from reading the docs) that's the
> right idea.

There is no point in communicate()-ing multiple times; communicate()
reads until EOF and only returns after subprocess termination!

Cheers,
Chris


From roy at panix.com  Wed Sep 21 23:58:19 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 21 Sep 2011 23:58:19 -0400
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<roy-E8A301.23321921092011@news.panix.com>
	<mailman.1343.1316663531.27778.python-list@python.org>
Message-ID: <roy-E3E50A.23581921092011@news.panix.com>

In article <mailman.1343.1316663531.27778.python-list at python.org>,
 Chris Rebert <clp2 at rebertia.com> wrote:

> Popen.poll():
>     Check if child process has terminated. Set **and return**
> returncode attribute.
> [Direct quote from the docs; emphasis added]

Doh.  I read right past that and didn't see it.  Thanks for the 
correction.


From steve+comp.lang.python at pearwood.info  Thu Sep 22 00:22:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 22 Sep 2011 04:22:39 GMT
Subject: Odd behavior with imp.reload and logging
References: <mailman.1338.1316656397.27778.python-list@python.org>
Message-ID: <4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>

On Wed, 21 Sep 2011 20:53:04 -0500, Andrew Berg wrote:

> When using a logger in a module and then using imp.reload to reload the
> module, logger messages are repeated in direct proportion to the number
> of times the modules was loaded. That is, on the first import, the
> message is written once, but on the second run, each message is written
> twice, three times on the third run, and so on.
[...]
> What causes this, and how can I fix it (or at least work around it)? Due
> to the nature of the program, it's much more convenient to reload a
> module than to restart the entire program (especially when testing).

You unconditionally add a handler every time you reload the module, 
regardless of whether or not the old handler is still there. You could 
try something like this (untested):


import logging
test_logger = logging.getLogger(__name__)
if not test_logger.handlers:
    console_handler = logging.StreamHandler()
    console_formatter = logging.Formatter(
       '{asctime} - {module} - {funcName} - line {lineno} - ' 
       '{levelname} - {message}', style='{'
       )
    console_handler.setFormatter(console_formatter)
    test_logger.addHandler(console_handler)
    test_logger.setLevel(logging.DEBUG)

test_logger.info('Test info')



-- 
Steven


From bahamutzero8825 at gmail.com  Thu Sep 22 00:47:55 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Wed, 21 Sep 2011 23:47:55 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7ABDFB.5020509@gmail.com>

On 2011.09.21 11:22 PM, Steven D'Aprano wrote:
> You could 
> try something like this (untested):
That works. Thanks!
This makes me wonder what else stays around after a reload and what side
effects there are, though. I would really like to purge everything from
the previous import. The main program has no dependence on the module
whatsoever.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From atherun at gmail.com  Thu Sep 22 00:52:42 2011
From: atherun at gmail.com (Atherun)
Date: Wed, 21 Sep 2011 21:52:42 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<roy-E8A301.23321921092011@news.panix.com>
	<mailman.1343.1316663531.27778.python-list@python.org>
	<roy-E3E50A.23581921092011@news.panix.com>
Message-ID: <56b9526d-fdd5-4f9d-bd39-d17b84f12141@h7g2000yqm.googlegroups.com>

On Sep 21, 8:58?pm, Roy Smith <r... at panix.com> wrote:
> In article <mailman.1343.1316663531.27778.python-l... at python.org>,
> ?Chris Rebert <c... at rebertia.com> wrote:
>
> > Popen.poll():
> > ? ? Check if child process has terminated. Set **and return**
> > returncode attribute.
> > [Direct quote from the docs; emphasis added]
>
> Doh. ?I read right past that and didn't see it. ?Thanks for the
> correction.

I removed the loop and changed it to a single communicate now, still
get a deadlock.  All threads just stop, even threads that have nothing
to do with the ongoing subprocesses.  I specifically created a thread
that dumps the stack trace of all threads so I can try and view the
deadlocks, but that stops responding at the same time as the
deadlock.  This wasn't happening before so not sure why it changed
suddenly.


From rosuav at gmail.com  Thu Sep 22 01:09:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 15:09:49 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7ABDFB.5020509@gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
Message-ID: <CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 2:47 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> This makes me wonder what else stays around after a reload and what side
> effects there are, though. I would really like to purge everything from
> the previous import. The main program has no dependence on the module
> whatsoever.
>

On-the-fly reloading of modules isn't really one of Python's
strengths. Everyone who asks about it seems to be doing rapid
development/debugging and wanting to save on startup time (as opposed
to, say, running a server and updating code in it while it's active
and serving clients), so the question becomes: Which is more of a
problem, startup delay or the risk that it's not the same as a clean
start? Python doesn't guarantee that your debugging session is going
to be useful - if you reload that module and weird things happen, it
could be because of reload(), not because of a module bug.

Ranting Rick will probably expect me to mention Pike here, but I
won't. Muahahahaha..... oh. I just did. Oh well!

ChrisA


From yves at zioup.com  Thu Sep 22 01:24:03 2011
From: yves at zioup.com (yves at zioup.com)
Date: Wed, 21 Sep 2011 23:24:03 -0600
Subject: with statements does not delete the object
Message-ID: <UDzeq.31563$Ol1.10576@newsfe07.iad>


Is this the expected behaviour:


     with mylib.token() as t:
       do_something

     dir()

In the last dir(), after the with "loop" is finished, t still shows up... I 
expected it to be unreferenced by then.

-- 
Yves.                                                  http://www.SollerS.ca/
                                                        http://ipv6.SollerS.ca
                                                        http://blog.zioup.org/


From bahamutzero8825 at gmail.com  Thu Sep 22 01:54:10 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Thu, 22 Sep 2011 00:54:10 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
Message-ID: <4E7ACD82.4080302@gmail.com>

On 2011.09.22 12:09 AM, Chris Angelico wrote:
> On-the-fly reloading of modules isn't really one of Python's
> strengths. Everyone who asks about it seems to be doing rapid
> development/debugging and wanting to save on startup time (as opposed
> to, say, running a server and updating code in it while it's active
> and serving clients), so the question becomes: Which is more of a
> problem, startup delay or the risk that it's not the same as a clean
> start? Python doesn't guarantee that your debugging session is going
> to be useful - if you reload that module and weird things happen, it
> could be because of reload(), not because of a module bug.
The main program is an IRC bot, which could potentially be in use by
many people in several channels on a network. As it is, the bot can only
connect to one server, but it could probably be set up to connect to any
number of networks. Making a number of quick fixes or changes to one
module could be very irritating to users if the bot has to terminate
each time, especially if those users don't know or care about that
specific module.
Startup time is an issue because it must connect to a network before it
can take any input. Also, many disconnects/reconnects could easily cause
problems (like the network refusing the connection as a DoS prevention
measure).
I'm not tied to any particular solution, and it's quite possible I'm
missing something since I am still a beginner.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From ben+python at benfinney.id.au  Thu Sep 22 02:01:05 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 22 Sep 2011 16:01:05 +1000
Subject: with statements does not delete the object
References: <UDzeq.31563$Ol1.10576@newsfe07.iad>
Message-ID: <871uv92k0u.fsf@benfinney.id.au>

yves at zioup.com writes:

> Is this the expected behaviour:

You can learn the expected behaviour for ?with? in the documentation
<URL:http://docs.python.org/reference/compound_stmts.html#the-with-statement>.

>     with mylib.token() as t:
>       do_something
>
>     dir()
>
> In the last dir(), after the with "loop" is finished, t still shows up... I
> expected it to be unreferenced by then.

What gives you that expectation, when it's not the case for any of ?if?,
?for?, ?while?, ?try?, and so on?

The set of statements which introduce a new scope is small, and ?with?
is not one of them.

-- 
 \             ?No smoothen the lion.? ?lion cage, zoo, Czech Republic |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From steve+comp.lang.python at pearwood.info  Thu Sep 22 02:12:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 22 Sep 2011 06:12:01 GMT
Subject: Environment variables not visible from Python
Message-ID: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>

I don't understand why some environment variables are not visible from 
Python.

[steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
30 140 xterm
[steve at wow-wow ~]$ python2.6
Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
(None, None, 'xterm')



-- 
Steven


From airween at gmail.com  Thu Sep 22 02:37:22 2011
From: airween at gmail.com (=?utf-8?B?SGVnZWTDvHMs?= Ervin)
Date: Thu, 22 Sep 2011 08:37:22 +0200
Subject: Environment variables not visible from Python
In-Reply-To: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110922063721.GA3655@arxnet.hu>

hello,

On Thu, Sep 22, 2011 at 06:12:01AM +0000, Steven D'Aprano wrote:
> I don't understand why some environment variables are not visible from 
> Python.
> 
> [steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
> 30 140 xterm
> [steve at wow-wow ~]$ python2.6
> Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import os
> >>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
> (None, None, 'xterm')

I think TERM is inherited from parent shell, but LINES and
COLUMNS are re-created every child shell. IMHO it's normally,
cause TERM will not change in child, but another variables should
changed...


Look at this:

airween at sebulba:~$ export LINES COLUMNS TERM
airween at sebulba:~$ python2.6
Python 2.6.6 (r266:84292, Mar 25 2011, 19:24:58) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
('65', '210', 'rxvt-256color')


a.
 


From kushal.kumaran+python at gmail.com  Thu Sep 22 02:40:08 2011
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Thu, 22 Sep 2011 12:10:08 +0530
Subject: Environment variables not visible from Python
In-Reply-To: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAH8GtdN767QV=rWZDimmkGqJ8HgC4cjStW2LXx5ER21uZiOcAQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 11:42 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> I don't understand why some environment variables are not visible from
> Python.
>
> [steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
> 30 140 xterm
> [steve at wow-wow ~]$ python2.6
> Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import os
>>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
> (None, None, 'xterm')
>
>

I have this:

$ python
Python 2.6.6 (r266:84292, Sep 15 2010, 16:22:56)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.getenv('LINES')
>>>
$ python -S
Python 2.6.6 (r266:84292, Sep 15 2010, 16:22:56)
[GCC 4.4.5] on linux2
>>> import os
>>> os.getenv('LINES')
'35'
>>>

I hope it helps narrow things down somewhat.

-- 
regards,
kushal


From rosuav at gmail.com  Thu Sep 22 02:46:59 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 16:46:59 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7ACD82.4080302@gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
Message-ID: <CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 3:54 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> The main program is an IRC bot, which could potentially be in use by
> many people in several channels on a network. As it is, the bot can only
> connect to one server, but it could probably be set up to connect to any
> number of networks. Making a number of quick fixes or changes to one
> module could be very irritating to users if the bot has to terminate
> each time, especially if those users don't know or care about that
> specific module.
> Startup time is an issue because it must connect to a network before it
> can take any input. Also, many disconnects/reconnects could easily cause
> problems (like the network refusing the connection as a DoS prevention
> measure).

Playing with networking and the desire to reload without restarting? I
think Pike may be a good choice for you. It has a C-like syntax but
Python-like guts; you use braces to delimit blocks of code, but arrays
and mappings and such are first-class objects that you can pass around
and use. It's a favorite of mine, but quite off-topic for this mailing
list; I'd be happy to help you get started with it.

Chris Angelico


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 03:21:59 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 09:21:59 +0200
Subject: Environment variables not visible from Python
In-Reply-To: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5enmt$uva$1@r03.glglgl.eu>

Am 22.09.2011 08:12 schrieb Steven D'Aprano:
> I don't understand why some environment variables are not visible from
> Python.
>
> [steve at wow-wow ~]$ echo $LINES $COLUMNS $TERM
> 30 140 xterm
> [steve at wow-wow ~]$ python2.6
> Python 2.6.6 (r266:84292, Dec 21 2010, 18:12:50)
> [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import os
>>>> (os.getenv('LINES'), os.getenv('COLUMNS'), os.getenv('TERM'))
> (None, None, 'xterm')
>

They are no environment variables, but merely shell variables.

You can turn them into environment variables with the shell command 
"export". After exporting them, they are visible by Python.

The environment can be obtained with env.

So try:

$ python -c 'import os; print "\n".join(sorted("%s=%s" % (k,v) for k,v 
in os.environ.iteritems()))' | diff -u - <(env|LANG=C sort)
@@ -61,4 +61,4 @@
  XDG_DATA_DIRS=/usr/share
  XKEYSYMDB=/usr/share/X11/XKeysymDB
  XNLSPATH=/usr/share/X11/nls
-_=/usr/bin/python
+_=/usr/bin/env

and you see that they (nearly) match.


Try as well

$ python -c 'import os; print "\n".join(os.getenv(k) or "" for k in 
("LINES","COLUMNS","TERM"))'


linux
$ export LINES
$ python -c 'import os; print "\n".join(os.getenv(k) or "" for k in 
("LINES","COLUMNS","TERM"))'
24

linux
$ export COLUMNS
$ python -c 'import os; print "\n".join(os.getenv(k) or "" for k in 
("LINES","COLUMNS","TERM"))'
24
80
linux
$

HTH,

Thomas


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 03:24:53 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 09:24:53 +0200
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
Message-ID: <j5ensa$v1i$1@r03.glglgl.eu>

Am 22.09.2011 05:42 schrieb Atherun:

> I'm pretty sure thats the problem, this is a generic catch all
> function for running subprocesses.  It can be anything to a simple
> command to a complex command with a ton of output.  I'm looking for a
> better solution to handle the case of running subprocesses that have
> an undetermined amount of output.

Just handle process.stdout/stderr by yourself - read it out until EOF 
and then wait() for the process.


Thomas


From ericsnowcurrently at gmail.com  Thu Sep 22 03:45:20 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Thu, 22 Sep 2011 01:45:20 -0600
Subject: static statements and thread safety
Message-ID: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>

A recent thread on the python-ideas list got me thinking about the
possibility of a static statement (akin to global and nonlocal).  I am
wondering if an implementation would have to address thread safety
concerns.

I would expect that static variables would work pretty much the same
way as default arguments, with a list of names on the code object and
a list of values on the function object.  And I would guess that the
values from the static variables would get updated on the function
object at the end of the call.  If multiple threads are executing the
function at the same time won't there be a problem with that
end-of-call update?

-eric


p.s. It probably shows that I haven't done a lot of thread-related
programming, so perhaps this is not a hard question.


From bahamutzero8825 at gmail.com  Thu Sep 22 03:59:42 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Thu, 22 Sep 2011 02:59:42 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
	<CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
Message-ID: <4E7AEAEE.20504@gmail.com>

On 2011.09.22 01:46 AM, Chris Angelico wrote:
> I think Pike may be a good choice for you.
That's quite unappealing for a few reasons. First, that would likely
require writing an entirely new bot (I'm not even that familiar with the
current one; I've only been writing a module for it). Also, I don't
really enjoy programming (I'm aware I'm likely in the minority on this
list); I tolerate it enough to get certain things done, so learning
another language, especially when I'm still learning Python, is not
something I want to do. Python is probably not the best tool for this
particular job, but I am not nearly dedicated to this project enough to
learn another programming language.

So, is there any way to at least monitor what happens after a reload? I
haven't noticed anything odd until I came across this logging issue.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From rosuav at gmail.com  Thu Sep 22 04:06:45 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 18:06:45 +1000
Subject: static statements and thread safety
In-Reply-To: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
Message-ID: <CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>

On Thu, Sep 22, 2011 at 5:45 PM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
> I would expect that static variables would work pretty much the same
> way as default arguments

Could you just abuse default arguments to accomplish this?

def accumulate(n,statics={'sum':0}):
    statics['sum']+=n
    return statics['sum']

>>> accumulate(1)
1
>>> accumulate(10)
11
>>> accumulate(20)
31
>>> accumulate(14)
45

This eliminates any sort of "end of function write-back" by writing to
static storage immediately. Of course, syntactic assistance would make
this look cleaner, for instance:

def accumulate(n):
    static sum=0
    sum+=n
    return sum

Both of these would, of course, have thread-safety issues. But these
can be resolved by figuring out exactly what you're trying to
accomplish with your static data, and what it really means when two
threads are affecting it at once.

ChrisA


From rosuav at gmail.com  Thu Sep 22 04:12:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 18:12:49 +1000
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4E7AEAEE.20504@gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
	<CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
	<4E7AEAEE.20504@gmail.com>
Message-ID: <CAPTjJmrzvFwqD_w5BxaQycSzsFSwVFiPzFKEAdhF=1_scw7ReQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 5:59 PM, Andrew Berg <bahamutzero8825 at gmail.com> wrote:
> That's quite unappealing for a few reasons. First, that would likely
> require writing an entirely new bot (I'm not even that familiar with the
> current one; I've only been writing a module for it).

Ah, then yeah, it's probably not a good idea to change languages. But
you may end up finding other issues with reload() as well.

I wonder whether this would work...

modules=[]

# instead of 'import mymodule' use:
modules.append(__import__('mymodule')); mymodule=modules[-1]

In theory, this should mean that you load it fresh every time - I
think. If not, manually deleting entries from sys.modules might help,
either with or without the list of modules.

ChrisA


From ladasky at my-deja.com  Thu Sep 22 04:13:12 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Thu, 22 Sep 2011 01:13:12 -0700 (PDT)
Subject: Graphing
References: <mailman.1328.1316619856.27778.python-list@python.org>
Message-ID: <b6c01506-e10f-457a-a039-9e63d393d021@f12g2000yqi.googlegroups.com>

I'm using matplotlib and I'm happy with it.  Quick plotting is easy
using the pyplot interface, which resembles the popular software
package MATLAB.  As your ambitions grow, matplotlib has many
sophisticated tools waiting for you.


From ericsnowcurrently at gmail.com  Thu Sep 22 04:16:11 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Thu, 22 Sep 2011 02:16:11 -0600
Subject: static statements and thread safety
In-Reply-To: <CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
	<CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>
Message-ID: <CALFfu7A7qx+bhr0r4OToJLXR54_OStKbbYEr+0BKCxpO7g3MnQ@mail.gmail.com>

On Thu, Sep 22, 2011 at 2:06 AM, Chris Angelico <rosuav at gmail.com> wrote:
> On Thu, Sep 22, 2011 at 5:45 PM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
>> I would expect that static variables would work pretty much the same
>> way as default arguments
>
> Could you just abuse default arguments to accomplish this?
>
> def accumulate(n,statics={'sum':0}):
> ? ?statics['sum']+=n
> ? ?return statics['sum']
>
>>>> accumulate(1)
> 1
>>>> accumulate(10)
> 11
>>>> accumulate(20)
> 31
>>>> accumulate(14)
> 45
>
> This eliminates any sort of "end of function write-back" by writing to
> static storage immediately. Of course, syntactic assistance would make
> this look cleaner, for instance:
>
> def accumulate(n):
> ? ?static sum=0
> ? ?sum+=n
> ? ?return sum
>
> Both of these would, of course, have thread-safety issues. But these
> can be resolved by figuring out exactly what you're trying to
> accomplish with your static data, and what it really means when two
> threads are affecting it at once.

That's a good point.  So, isn't the default arguments hack in the same
boat with regards to threads?

Maybe I'm just misunderstanding the thread concept in Python.  Threads
have separate execution stacks but share interpreter global state,
right?

-eric

>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rosuav at gmail.com  Thu Sep 22 04:18:28 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 22 Sep 2011 18:18:28 +1000
Subject: static statements and thread safety
In-Reply-To: <CALFfu7A7qx+bhr0r4OToJLXR54_OStKbbYEr+0BKCxpO7g3MnQ@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
	<CAPTjJmpPJnXTJX_QnrYKcvR_oBVFZ74KFbphfLhxPV6nznQw-Q@mail.gmail.com>
	<CALFfu7A7qx+bhr0r4OToJLXR54_OStKbbYEr+0BKCxpO7g3MnQ@mail.gmail.com>
Message-ID: <CAPTjJmoQ4_BdupvM=XL3_9=B6OUQSajnOV3o4UpAp16A8Gty_g@mail.gmail.com>

On Thu, Sep 22, 2011 at 6:16 PM, Eric Snow <ericsnowcurrently at gmail.com> wrote:
> That's a good point. ?So, isn't the default arguments hack in the same
> boat with regards to threads?
>
> Maybe I'm just misunderstanding the thread concept in Python. ?Threads
> have separate execution stacks but share interpreter global state,
> right?

I would say it probably is, but others on this list will know more of
threading in Python. I tend not to write multithreaded programs in
Python - the main reason for me to use Python is rapid scriptwriting,
which usually doesn't demand threads.

ChrisA


From steve+comp.lang.python at pearwood.info  Thu Sep 22 04:25:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 22 Sep 2011 08:25:39 GMT
Subject: Odd behavior with imp.reload and logging
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1344.1316666895.27778.python-list@python.org>
Message-ID: <4e7af102$0$30000$c3e8da3$5496439d@news.astraweb.com>

On Wed, 21 Sep 2011 23:47:55 -0500, Andrew Berg wrote:

> On 2011.09.21 11:22 PM, Steven D'Aprano wrote:
>> You could
>> try something like this (untested):
> That works. Thanks!
> This makes me wonder what else stays around after a reload 

Practically everything. A reload doesn't delete anything, except as a 
side-effect of running the module again.

Don't think of reloading as:

  * Revert anything the module is responsible for.
  * Delete the module object from the import cache.
  * Import the module in a fresh environment.

Instead, think of it as:

  * Re-import the module in the current environment.


In practice, you won't often see such side-effects, because most modules 
don't store state outside of themselves. If they store state *inside* 
themselves, then they will (almost always) overwrite that state. E.g. 
this will work as expected:


state = [something]


But this leaves state hanging around in other modules and will be 
surprising:

import another_module
another_module.state.append(something)


My guess is that the logging module uses a cache to save the logger, 
hence there is state inadvertently stored outside your module.


Another place where reload() doesn't work as expected:

>>> import module
>>> a = module.MyClass()
>>> reload(module)
<module 'module' from 'module.pyc'>
>>> b = module.MyClass()
>>> type(a) is type(b)
False


Objects left lying around from before the reload will keep references 
open to the way things were before the reload. This often leads to 
confusion when modules are edited, then reloaded. (Been there, done that.)



-- 
Steven


From bahamutzero8825 at gmail.com  Thu Sep 22 05:02:48 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Thu, 22 Sep 2011 04:02:48 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <4e7af102$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1344.1316666895.27778.python-list@python.org>
	<4e7af102$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7AF9B8.7020802@gmail.com>

On 2011.09.22 03:25 AM, Steven D'Aprano wrote:
> Objects left lying around from before the reload will keep references 
> open to the way things were before the reload. This often leads to 
> confusion when modules are edited, then reloaded. (Been there, done that.)
I'll keep that in mind. My module does have a class, but instances are
kept inside dictionaries, which are explicitly set to {} at the
beginning (can't use the update() method for dictionaries that don't
exist). Also, class instances get pickled after creation and unpickled
when the module is imported.

-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From chris at simplistix.co.uk  Thu Sep 22 05:27:36 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Thu, 22 Sep 2011 10:27:36 +0100
Subject: python install on locked down windows box?
Message-ID: <4E7AFF88.2040308@simplistix.co.uk>

Hi All,

Is there a way to install python on a locked down Windows desktop?
(ie: no compilers, no admin rights, etc)

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From ben+python at benfinney.id.au  Thu Sep 22 06:16:47 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 22 Sep 2011 20:16:47 +1000
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87wrd0286o.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I don't understand why some environment variables are not visible from 
> Python.

Not all variables are environment variables. Variables only become
environment variables if exported to the environment; the ?export?
command is one way to do that.

-- 
 \       ?As far as the laws of mathematics refer to reality, they are |
  `\    not certain, and as far as they are certain, they do not refer |
_o__)                              to reality.? ?Albert Einstein, 1983 |
Ben Finney


From zondo42 at gmail.com  Thu Sep 22 06:19:05 2011
From: zondo42 at gmail.com (Glenn Hutchings)
Date: Thu, 22 Sep 2011 03:19:05 -0700 (PDT)
Subject: python install on locked down windows box?
In-Reply-To: <mailman.1357.1316683648.27778.python-list@python.org>
References: <mailman.1357.1316683648.27778.python-list@python.org>
Message-ID: <13828134.867.1316686745332.JavaMail.geo-discussion-forums@yqbr29>

You could try Portable Python (http://www.portablepython.com).  No need to install anything!


From zondo42 at gmail.com  Thu Sep 22 06:19:05 2011
From: zondo42 at gmail.com (Glenn Hutchings)
Date: Thu, 22 Sep 2011 03:19:05 -0700 (PDT)
Subject: python install on locked down windows box?
In-Reply-To: <mailman.1357.1316683648.27778.python-list@python.org>
References: <mailman.1357.1316683648.27778.python-list@python.org>
Message-ID: <13828134.867.1316686745332.JavaMail.geo-discussion-forums@yqbr29>

You could try Portable Python (http://www.portablepython.com).  No need to install anything!


From gavinpanella at gmail.com  Thu Sep 22 06:21:28 2011
From: gavinpanella at gmail.com (Gavin Panella)
Date: Thu, 22 Sep 2011 03:21:28 -0700 (PDT)
Subject: Context manager with class methods
Message-ID: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>

Hi,

On Python 2.6 and 3.1 the following code works fine:

    class Foo(object):
    
        @classmethod
        def __enter__(cls):
            print("__enter__")
    
        @classmethod
        def __exit__(cls, exc_type, exc_value, traceback):
            print("__exit__")
    
    with Foo: pass

However, in 2.7 and 3.2 I get:

    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    AttributeError: __exit__

Is this a regression or a deliberate change? Off the top of my head I
can't think that this pattern is particularly useful, but it seems
like something that ought to work.

Gavin.


From vs at it.uu.se  Thu Sep 22 06:25:30 2011
From: vs at it.uu.se (Virgil Stokes)
Date: Thu, 22 Sep 2011 12:25:30 +0200
Subject: Execute code after Shut Down command given --- How?
Message-ID: <4E7B0D1A.7040306@it.uu.se>

I would like to execute some Python code (popup message to be displayed) when 
Windows Vista/7 is shut down. That is, this code should execute after  "Shut 
Down" is given from the "Shut Down Windows" popup, but before the actual shut 
down sequence starts.

How to write Python code to accomplish this task?



From yasar11732 at gmail.com  Thu Sep 22 06:43:48 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 22 Sep 2011 13:43:48 +0300
Subject: httplib's HEAD request, and https protocol
Message-ID: <CAFEUn8agoT2pFrD62jNk64Jes7dLSQcyDpJm6_a14qkmpLaJog@mail.gmail.com>

Hi,

I wrote a function to get thorugh redirections and find a final page for a
given web-page. But following function gives maximum recursion error for any
https pages I tried. Do you know what might be the problem here?

def getHeadResponse(url,response_cache = {}):
    try:
        return response_cache[url]
    except KeyError:
        url = urlparse.urlparse(url)
        conn = httplib.HTTPConnection(url.netloc)
        try:
            conn.request("HEAD",url.path)
        except:
            # Anything can happen, this is SPARTA!
            return None
        response = conn.getresponse()
        response_cache[url.geturl()] = response
        return response

def getFinalUrl(url):
    "Navigates through redirections to get final url."

    response = getHeadResponse(url)
    try:
        if str(response.status).startswith("3"):
            return getFinalUrl(response.getheader("location"))
    except AttributeError:
        pass
    return url
-- 
http://yasar.serveblog.net/
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From shilparani9030 at gmail.com  Thu Sep 22 06:48:47 2011
From: shilparani9030 at gmail.com (SHILPA)
Date: Thu, 22 Sep 2011 03:48:47 -0700 (PDT)
Subject: TOP 15 HOT BOLLYWOOD KISSES
Message-ID: <c69c795f-8575-4ee9-a963-1ce7106dcaa5@s20g2000yql.googlegroups.com>


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From steve+comp.lang.python at pearwood.info  Thu Sep 22 07:07:31 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 22 Sep 2011 21:07:31 +1000
Subject: Execute code after Shut Down command given --- How?
References: <mailman.1363.1316688610.27778.python-list@python.org>
Message-ID: <4e7b16f4$0$29979$c3e8da3$5496439d@news.astraweb.com>

Virgil Stokes wrote:

> I would like to execute some Python code (popup message to be displayed)
> when
> Windows Vista/7 is shut down. That is, this code should execute after 
> "Shut Down" is given from the "Shut Down Windows" popup, but before the
> actual shut down sequence starts.
> 
> How to write Python code to accomplish this task?


Exactly the same way you would write it in any other language.

This is not a Python question. It is a Windows question: "How do I execute
code after the user calls Shut Down Windows, but before the shut down
sequence starts?" Find out how to do that, and then do it using Python
instead of another language.



-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep 22 07:09:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 22 Sep 2011 21:09:00 +1000
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<87wrd0286o.fsf@benfinney.id.au>
Message-ID: <4e7b174c$0$29979$c3e8da3$5496439d@news.astraweb.com>

Ben Finney wrote:

> Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:
> 
>> I don't understand why some environment variables are not visible from
>> Python.
> 
> Not all variables are environment variables. Variables only become
> environment variables if exported to the environment; the ?export?
> command is one way to do that.

I see. Thank you to everyone who answered.


-- 
Steven



From joni8135 at gmail.com  Thu Sep 22 07:16:34 2011
From: joni8135 at gmail.com (joni)
Date: Thu, 22 Sep 2011 04:16:34 -0700 (PDT)
Subject: Negativ nearest interger?
Message-ID: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>

Have a simple question in the Integer calculator in Python 2.65 and
also 2.7..

The consol showing:

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.

>>> 7.0/3  #fist to show floiting-point calculation
2.3333333333333335
>>> -7.0/3
-2.3333333333333335
>>> -7/-3 #Rounding to nearest interger.
2
>>> 7/3
2
>>> 7/-3  #Now to the problem with interger rounding with negative anwser.
-3
>>> -7/3
-3
>>>

-3 are more wrong than -2. Negativ number seems not to round to
nearest interger, but the integer UNDER the anwser!! Or?

Why?



From yasar11732 at gmail.com  Thu Sep 22 07:42:12 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Thu, 22 Sep 2011 14:42:12 +0300
Subject: httplib's HEAD request, and https protocol
In-Reply-To: <CAFEUn8agoT2pFrD62jNk64Jes7dLSQcyDpJm6_a14qkmpLaJog@mail.gmail.com>
References: <CAFEUn8agoT2pFrD62jNk64Jes7dLSQcyDpJm6_a14qkmpLaJog@mail.gmail.com>
Message-ID: <CAFEUn8bpHKPHA0ar-b6XwE0v182PCwFQV4C-zKSiSpi_WepASA@mail.gmail.com>

Ok, nevermind. Appereantly there is such a thing as HTTPSConnection. I
thought httplib auto-handled https connections..

22 Eyl?l 2011 13:43 tarihinde Ya?ar Arabac? <yasar11732 at gmail.com> yazd?:

> Hi,
>
> I wrote a function to get thorugh redirections and find a final page for a
> given web-page. But following function gives maximum recursion error for any
> https pages I tried. Do you know what might be the problem here?
>
> def getHeadResponse(url,response_cache = {}):
>     try:
>         return response_cache[url]
>     except KeyError:
>         url = urlparse.urlparse(url)
>         conn = httplib.HTTPConnection(url.netloc)
>         try:
>             conn.request("HEAD",url.path)
>         except:
>             # Anything can happen, this is SPARTA!
>             return None
>         response = conn.getresponse()
>         response_cache[url.geturl()] = response
>         return response
>
> def getFinalUrl(url):
>     "Navigates through redirections to get final url."
>
>     response = getHeadResponse(url)
>     try:
>         if str(response.status).startswith("3"):
>             return getFinalUrl(response.getheader("location"))
>     except AttributeError:
>         pass
>     return url
> --
> http://yasar.serveblog.net/
>
>


-- 
http://yasar.serveblog.net/
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From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 07:43:52 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 13:43:52 +0200
Subject: Environment variables not visible from Python
In-Reply-To: <87wrd0286o.fsf@benfinney.id.au>
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<87wrd0286o.fsf@benfinney.id.au>
Message-ID: <j5f71t$92c$1@r03.glglgl.eu>

Am 22.09.2011 12:16 schrieb Ben Finney:
> --
>   \       ?As far as the laws of mathematics refer to reality, they are |
>    `\    not certain, and as far as they are certain, they do not refer |
> _o__)                              to reality.? ?Albert Einstein, 1983 |
> Ben Finney

So, he said what in 1983? Wow.



From jpiitula at ling.helsinki.fi  Thu Sep 22 07:44:15 2011
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 22 Sep 2011 14:44:15 +0300
Subject: Negativ nearest interger?
References: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>
Message-ID: <qot7h50vm28.fsf@ruuvi.it.helsinki.fi>

joni writes:

> Have a simple question in the Integer calculator in Python 2.65 and
> also 2.7..
> 
> The consol showing:
> 
> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
...
> >>> -7/3
> -3
> >>>
> 
> -3 are more wrong than -2. Negativ number seems not to round to
> nearest interger, but the integer UNDER the anwser!! Or?
> 
> Why?

It simply does not round to the nearest integer. It floors. This has
nicer mathematical properties. In particular, it allows the remainder
(notated as "per cent") operation (n % m) to return a number that
differs from n by a multiple of m ("is congruent to n modulo m").
These two operations go together.


From nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de  Thu Sep 22 07:47:15 2011
From: nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915 at spamschutz.glglgl.de (Thomas Rachel)
Date: Thu, 22 Sep 2011 13:47:15 +0200
Subject: Context manager with class methods
In-Reply-To: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
Message-ID: <j5f789$95i$1@r03.glglgl.eu>

Am 22.09.2011 12:21 schrieb Gavin Panella:
> Hi,
>
> On Python 2.6 and 3.1 the following code works fine:
>
>      class Foo(object):
>
>          @classmethod
>          def __enter__(cls):
>              print("__enter__")
>
>          @classmethod
>          def __exit__(cls, exc_type, exc_value, traceback):
>              print("__exit__")
>
>      with Foo: pass
>
> However, in 2.7 and 3.2 I get:
>
>      Traceback (most recent call last):
>        File "<stdin>", line 1, in<module>
>      AttributeError: __exit__

Same here.

But

     with Foo(): pass

works, and that is more important and more logical.


Thomas


From ben+python at benfinney.id.au  Thu Sep 22 08:26:15 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 22 Sep 2011 22:26:15 +1000
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<87wrd0286o.fsf@benfinney.id.au> <j5f71t$92c$1@r03.glglgl.eu>
Message-ID: <87r538226w.fsf@benfinney.id.au>

Thomas Rachel writes:

> Am 22.09.2011 12:16 schrieb Ben Finney:
> > --
> >   \       ?As far as the laws of mathematics refer to reality, they are |
> >    `\    not certain, and as far as they are certain, they do not refer |
> > _o__)                              to reality.? ?Albert Einstein, 1983 |
> > Ben Finney
>
> So, he said what in 1983? Wow.

Or at least, in a work of his published in 1983: ?Sidelights on
Relativity?. According to Wikiquote, anyway
<URL:https://secure.wikimedia.org/wikiquote/en/wiki/Albert_Einstein>.

-- 
 \      ?[Entrenched media corporations will] maintain the status quo, |
  `\       or die trying. Either is better than actually WORKING for a |
_o__)                  living.? ?ringsnake.livejournal.com, 2007-11-12 |
Ben Finney


From mwilson at the-wire.com  Thu Sep 22 08:45:18 2011
From: mwilson at the-wire.com (Mel)
Date: Thu, 22 Sep 2011 08:45:18 -0400
Subject: Context manager with class methods
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
Message-ID: <j5faks$egq$1@speranza.aioe.org>

Gavin Panella wrote:

> Hi,
> 
> On Python 2.6 and 3.1 the following code works fine:
> 
>     class Foo(object):
>     
>         @classmethod
>         def __enter__(cls):
>             print("__enter__")
>     
>         @classmethod
>         def __exit__(cls, exc_type, exc_value, traceback):
>             print("__exit__")
>     
>     with Foo: pass
> 
> However, in 2.7 and 3.2 I get:
> 
>     Traceback (most recent call last):
>       File "<stdin>", line 1, in <module>
>     AttributeError: __exit__
> 
> Is this a regression or a deliberate change? Off the top of my head I
> can't think that this pattern is particularly useful, but it seems
> like something that ought to work.

This seems to work:



class MetaWith (type):
    @classmethod
    def __enter__(cls):
        print("__enter__")

    @classmethod
    def __exit__(cls, exc_type, exc_value, traceback):
        print("__exit__")

class With (object):
    __metaclass__ = MetaWith
    
with With:
    pass
    


	Mel.	



From mwilson at the-wire.com  Thu Sep 22 08:53:21 2011
From: mwilson at the-wire.com (Mel)
Date: Thu, 22 Sep 2011 08:53:21 -0400
Subject: Context manager with class methods
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
	<j5faks$egq$1@speranza.aioe.org>
Message-ID: <j5fb3v$fup$1@speranza.aioe.org>

Mel wrote:
> This seems to work:
> 
> 
> 
> class MetaWith (type):
>     @classmethod
>     def __enter__(cls):
>         print("__enter__")
> 
>     @classmethod
>     def __exit__(cls, exc_type, exc_value, traceback):
>         print("__exit__")
> 
> class With (object):
>     __metaclass__ = MetaWith
>     
> with With:
>     pass

It seems to work equally well without the `@classmethod`s

	Mel.



From steve+comp.lang.python at pearwood.info  Thu Sep 22 08:58:00 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 22 Sep 2011 22:58:00 +1000
Subject: python install on locked down windows box?
References: <mailman.1357.1316683648.27778.python-list@python.org>
Message-ID: <4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>

Chris Withers wrote:

> Hi All,
> 
> Is there a way to install python on a locked down Windows desktop?
> (ie: no compilers, no admin rights, etc)

(1) Bribe or blackmail the fascist system administrator.

(2) Hack into the system with any of dozens of unpatched vulnerabilities
that will give you admin rights.

(3) Sneak into the office at 3 in the morning and replace the desktop with
an identical machine which you have admin rights to.

(4) Guess the admin password -- it's not hard, most fascist system
administrators can't remember words with more than four letters, so the
password is probably something like "passw" or, if he's being especially
cunning, "drows".

(5) "Accidentally" install Linux on the machine and use that instead.

(6) Take hostages.

(7) If all else fails, as an absolute last resort, simply run the Windows
installer as a regular, unprivileged user, after selecting the option for a
Non-Admin Install under Advanced Options first. You could also try the
ActivePython installer.

http://www.richarddooling.com/index.php/2006/03/14/python-on-xp-7-minutes-to-hello-world/
http://diveintopython.org/installing_python/windows.html



-- 
Steven



From joni8135 at gmail.com  Thu Sep 22 10:13:54 2011
From: joni8135 at gmail.com (joni)
Date: Thu, 22 Sep 2011 07:13:54 -0700 (PDT)
Subject: Negativ nearest interger?
References: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>
	<qot7h50vm28.fsf@ruuvi.it.helsinki.fi>
Message-ID: <c894dfd7-1189-4ffa-a8c5-97d27de7572e@x1g2000yqd.googlegroups.com>

On Sep 22, 1:44?pm, Jussi Piitulainen <jpiit... at ling.helsinki.fi>
wrote:
> joni writes:
> > Have a simple question in the Integer calculator in Python 2.65 and
> > also 2.7..
>
> > The consol showing:
>
> > Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
> ...
> > >>> -7/3
> > -3
>
> > -3 are more wrong than -2. Negativ number seems not to round to
> > nearest interger, but the integer UNDER the anwser!! Or?
>
> > Why?
>
> It simply does not round to the nearest integer. It floors. This has
> nicer mathematical properties. In particular, it allows the remainder
> (notated as "per cent") operation (n % m) to return a number that
> differs from n by a multiple of m ("is congruent to n modulo m").
> These two operations go together.

Thanx. See if I can understand it.... /Cheers


From ian at excess.org  Thu Sep 22 11:05:00 2011
From: ian at excess.org (Ian Ward)
Date: Thu, 22 Sep 2011 11:05:00 -0400
Subject: ANN: Urwid 1.0.0 - Console UI Library
Message-ID: <4E7B4E9C.7060704@excess.org>

Announcing Urwid 1.0.0
----------------------

Urwid home page:
  http://excess.org/urwid/

Manual:
  http://excess.org/urwid/wiki/UrwidManual

Tarball:
  http://excess.org/urwid/urwid-1.0.0.tar.gz


About this release:
===================

This is a major feature release for Urwid:

It's the first official release that has support for Python 3.

There's a new experimental Terminal widget so you can terminal while you
terminal or write a screen-clone.

There's a new example showing how to serve Urwid interfaces to many
users simultaneously over ssh with Twisted.

There are new classes to help with creating dynamic tree views of
anything you have that's tree-like.

There are new widgets for working with pop-ups so you can now have all
the menu bars, drop-downs and combo-boxes you can write.

The old requirement to sprinkle draw_screen() calls around your
callbacks is gone.  Urwid now updates the screen automatically after
everything else is done.

There's a new simple MainLoop method for catching updates from other
threads and processes.  No need to manually fumble with os.pipe() and
event loops.

And lots more...

Happy 1.0 Urwid!  It's been a great nearly-seven years since our first
release.  Huge thanks to everyone that's contributed code, docs, bug
reports and help on the mailing list and IRC.


New in this release:
====================

  * New support for Python 3.2 from the same 2.x code base,
    requires distribute instead of setuptools (by Kirk McDonald,
    Wendell, Marien Zwart) everything except TwistedEventLoop and
    GLibEventLoop is supported

  * New experimental Terminal widget with xterm emulation and
    terminal.py example program (by aszlig)

  * Edit widget now supports a mask (for passwords), has a
    insert_text_result() method for full-field validation and
    normalizes input text to Unicode or bytes based on the caption
    type used

  * New TreeWidget, TreeNode, ParentNode, TreeWalker
    and TreeListBox classes for lazy expanding/collapsing tree
    views factored out of browse.py example program, with new
    treesample.py example program (by Rob Lanphier)

  * MainLoop now calls draw_screen() just before going idle, so extra
    calls to draw_screen() in user code may now be removed

  * New MainLoop.watch_pipe() method for subprocess or threaded
    communication with the process/thread updating the UI, and new
    subproc.py example demonstrating its use

  * New PopUpLauncher and PopUpTarget widgets and MainLoop option
    for creating pop-ups and drop-downs, and new pop_up.py example
    program

  * New twisted_serve_ssh.py example (by Ali Afshar) that serves
    multiple displays over ssh from the same application using
    Twisted and the TwistedEventLoop

  * ListBox now includes a get_cursor_coords() method, allowing
    nested ListBox widgets

  * Columns widget contents may now be marked to always be treated
    as flow widgets for mixing flow and box widgets more easily

  * New lcd_display module with support for CF635 USB LCD panel and
    lcd_cf635.py example program with menus, slider controls and a
    custom font

  * Shared command_map instance is now stored as Widget._command_map
    class attribute and may be overridden in subclasses or individual
    widgets for more control over special keystrokes

  * Overlay widget parameters may now be adjusted after creation with
    set_overlay_parameters() method

  * New WidgetPlaceholder widget useful for swapping widgets without
    having to manipulate a container widget's contents

  * LineBox widgets may now include title text

  * ProgressBar text content and alignment may now be overridden

  * Use reactor.stop() in TwistedEventLoop and document that Twisted's
    reactor is not designed to be stopped then restarted

  * curses_display now supports AttrSpec and external event loops
    (Twisted or GLib) just like raw_display

  * raw_display and curses_display now support the IBMPC character
    set (currently only used by Terminal widget)

  * Fix for a gpm_mev bug preventing user input when on the console

  * Fix for leaks of None objects in str_util extension

  * Fix for WidgetWrap and AttrMap not working with fixed widgets

  * Fix for a lock up when attempting to wrap text containing wide
    characters into a single character column


About Urwid
===========

Urwid is a console UI library for Python. It features fluid interface
resizing, Unicode support, multiple text layouts, simple attribute
markup, powerful scrolling list boxes and flexible interface design.

Urwid is released under the GNU LGPL.


From python at mrabarnett.plus.com  Thu Sep 22 11:19:04 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 22 Sep 2011 16:19:04 +0100
Subject: static statements and thread safety
In-Reply-To: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
References: <CALFfu7C3as5-G97R-b281gqVnbLpoPaNB+VeRdz=WzeO0YoHWQ@mail.gmail.com>
Message-ID: <4E7B51E8.10200@mrabarnett.plus.com>

On 22/09/2011 08:45, Eric Snow wrote:
> A recent thread on the python-ideas list got me thinking about the
> possibility of a static statement (akin to global and nonlocal).  I am
> wondering if an implementation would have to address thread safety
> concerns.
>
> I would expect that static variables would work pretty much the same
> way as default arguments, with a list of names on the code object and
> a list of values on the function object.  And I would guess that the
> values from the static variables would get updated on the function
> object at the end of the call.  If multiple threads are executing the
> function at the same time won't there be a problem with that
> end-of-call update?
>
It's no different from using a global, except that it's not in the
global (module) namespace, but attached to a function object.

> -eric
>
>
> p.s. It probably shows that I haven't done a lot of thread-related
> programming, so perhaps this is not a hard question.


From atherun at gmail.com  Thu Sep 22 11:55:40 2011
From: atherun at gmail.com (Atherun)
Date: Thu, 22 Sep 2011 08:55:40 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
Message-ID: <bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>

On Sep 22, 12:24?am, Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-
a470-7603bd3aa... at spamschutz.glglgl.de> wrote:
> Am 22.09.2011 05:42 schrieb Atherun:
>
> > I'm pretty sure thats the problem, this is a generic catch all
> > function for running subprocesses. ?It can be anything to a simple
> > command to a complex command with a ton of output. ?I'm looking for a
> > better solution to handle the case of running subprocesses that have
> > an undetermined amount of output.
>
> Just handle process.stdout/stderr by yourself - read it out until EOF
> and then wait() for the process.
>
> Thomas

Thats what confuses me though, the documentation says
process.stdout.read()/stderr.read() can deadlock and apparently so can
communicate, how do you read the stdout/stderr on yourself if its
documented using them can cause a deadlock?


From navkirat.py at gmail.com  Thu Sep 22 12:00:18 2011
From: navkirat.py at gmail.com (Navkirat Singh)
Date: Thu, 22 Sep 2011 21:30:18 +0530
Subject: Decision on python technologies
Message-ID: <CAKzQzuvjDYeRLRfGOwBeo+9iNZLh8AN401ripZRtaqdbDesd7g@mail.gmail.com>

Hi Guys,

I have been a python developer for a bit now and for the life of me I am not
being able to decide something. I am trying to develop a web based
application in python. I am torn between using python 2 or 3. All the good
frameworks are still in 2.x. Now, cherrypy, sqlalchemy and jinja2 support
python 3. But do I really want to do all the boilerplate work again? I have
this strong urge to use python 3 and call it my indecisiveness , I am
somehow not wanting to use 2.x, though it has everything I need to build my
app. Hence, I finally decided to turn to the community for helping me make
this decision.

Please help.

Regards,
Nav
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From miki.tebeka at gmail.com  Thu Sep 22 12:28:52 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 22 Sep 2011 09:28:52 -0700 (PDT)
Subject: [ANNC] pynguin-0.12  (fixes problems running on Windows)
In-Reply-To: <mailman.1337.1316655424.27778.python-list@python.org>
References: <mailman.1337.1316655424.27778.python-list@python.org>
Message-ID: <19309769.959.1316708932280.JavaMail.geo-discussion-forums@prdy8>

Thank you! My kids *love* it.


From miki.tebeka at gmail.com  Thu Sep 22 12:28:52 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 22 Sep 2011 09:28:52 -0700 (PDT)
Subject: [ANNC] pynguin-0.12  (fixes problems running on Windows)
In-Reply-To: <mailman.1337.1316655424.27778.python-list@python.org>
References: <mailman.1337.1316655424.27778.python-list@python.org>
Message-ID: <19309769.959.1316708932280.JavaMail.geo-discussion-forums@prdy8>

Thank you! My kids *love* it.


From ppearson at nowhere.invalid  Thu Sep 22 12:51:39 2011
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 22 Sep 2011 16:51:39 GMT
Subject: Environment variables not visible from Python
References: <4e7ad1b1$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<j5enmt$uva$1@r03.glglgl.eu>
Message-ID: <9e17crFamfU1@mid.individual.net>

On Thu, 22 Sep 2011 09:21:59 +0200, Thomas Rachel wrote:
[snip]
> $ python -c 'import os; print "\n".join(sorted("%s=%s" % (k,v) for k,v 
> in os.environ.iteritems()))' | diff -u - <(env|LANG=C sort)

[standing ovation]

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


From rosuav at gmail.com  Thu Sep 22 13:39:54 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 23 Sep 2011 03:39:54 +1000
Subject: random.randint() slow, esp in Python 3
Message-ID: <CAPTjJmo5W_x6C9-vQ-BK9=q7MNQK7PXiMPqQMTxT_5JLeOmdMQ@mail.gmail.com>

The standard library function random.randint() seems to be quite slow
compared to random.random(), and worse in Python 3 than Python 2
(specifically that's 3.3a0 latest from Mercurial, and 2.6.6 that came
default on my Ubuntu install).

My test involves building a list of one million random integers
between 0 and ten million (for tinkering with sorting algorithms),
using a list comprehension:

import random
import time
sz=1000000
start=time.time()
a=[random.randint(0,sz*10-1) for i in range(sz)]
print("Time taken: ",time.time()-start)

The code works fine in either version of Python (although the display
looks a bit odd in Py2). But on my test system, it takes about 5
seconds to run in Py2, and about 10 seconds for Py3. (The obvious
optimization of breaking sz*10-1 out and storing it in a variable
improves both times, but leaves the dramatic difference.)

Replacing randint with random():
a=[int(random.random()*top) for i in range(sz)]
cuts the times down to about 1.5 secs for Py2, and 1.8 secs for Py3.

I suspect that the version difference is (at least in part) due to the
merging of the 'int' and 'long' types in Py3. This is supported
experimentally by rerunning the second list comp but using int() in
place of long() - the time increases to about 1.7-1.8 secs, matching
Py3.

But this still doesn't explain why randint() is so much slower. In
theory, randint() should be doing basically the same thing that I've
done here (multiply by the top value, truncate the decimal), only it's
in C instead of Python - if anything, it should be faster than doing
it manually, not slower.

A minor point of curiosity, nothing more... but, I think, a fascinating one.

ChrisA


From nobody at nowhere.com  Thu Sep 22 13:44:09 2011
From: nobody at nowhere.com (Nobody)
Date: Thu, 22 Sep 2011 18:44:09 +0100
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
Message-ID: <pan.2011.09.22.17.44.08.952000@nowhere.com>

On Thu, 22 Sep 2011 08:55:40 -0700, Atherun wrote:

>> Just handle process.stdout/stderr by yourself - read it out until EOF
>> and then wait() for the process.
> 
> Thats what confuses me though, the documentation says
> process.stdout.read()/stderr.read() can deadlock and apparently so can
> communicate, how do you read the stdout/stderr on yourself if its
> documented using them can cause a deadlock?

If you try to read/write two or more of stdin/stdout/stderr via the
"naive" approach, you run the risk of the child process writing more than
a pipe's worth of data to one stream (and thus blocking) while the
parent is performing a blocking read/write on another stream, resulting in
deadlock.

The .communicate() method avoids the deadlock by either:

1. On Unix, using non-blocking I/O and select(), or
2. On Windows, creating a separate thread for each stream.

Either way, the result is that it can always read/write whichever
streams are ready, so the child will never block indefinitely while
waiting for the parent.

If .communicate() is blocking indefinitely, it suggests that the child
process never terminates. There are many reasons why this might happen,
and most of them depend upon exactly what the child process is doing.

I suggest obtaining a copy of Process Explorer, and using it to
investigate the state of both processes (but especially the child) at the
point that the "deadlock" seems to occur.



From steve+comp.lang.python at pearwood.info  Thu Sep 22 14:14:16 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 23 Sep 2011 04:14:16 +1000
Subject: random.randint() slow, esp in Python 3
References: <mailman.1371.1316713198.27778.python-list@python.org>
Message-ID: <4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> The standard library function random.randint() seems to be quite slow
> compared to random.random(), and worse in Python 3 than Python 2
[...]
> But this still doesn't explain why randint() is so much slower. In
> theory, randint() should be doing basically the same thing that I've
> done here (multiply by the top value, truncate the decimal), only it's
> in C instead of Python - if anything, it should be faster than doing
> it manually, not slower.

What makes you think it's in C? I don't have Python 3.3a, but in 3.2 the
random module is mostly Python. There is an import of _random, which
presumably is in C, but it doesn't have a randint method:

>>> import _random
>>> _random.Random.randint
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object '_random.Random' has no attribute 'randint'


I'm not seeing any significant difference in speed between 2.6 and 3.2:

[steve at sylar ~]$ python2.6 -m timeit -s "from random import
randint" "randint(0, 1000000)"
100000 loops, best of 3: 4.29 usec per loop

[steve at sylar ~]$ python3.2 -m timeit -s "from random import
randint" "randint(0, 1000000)"
100000 loops, best of 3: 4.98 usec per loop


(The times are quite variable: the above are the best of three attempts.)



-- 
Steven



From emile at fenx.com  Thu Sep 22 14:16:05 2011
From: emile at fenx.com (Emile van Sebille)
Date: Thu, 22 Sep 2011 11:16:05 -0700
Subject: Decision on python technologies
In-Reply-To: <CAKzQzuvjDYeRLRfGOwBeo+9iNZLh8AN401ripZRtaqdbDesd7g@mail.gmail.com>
References: <CAKzQzuvjDYeRLRfGOwBeo+9iNZLh8AN401ripZRtaqdbDesd7g@mail.gmail.com>
Message-ID: <j5fttm$7bl$1@dough.gmane.org>

On 9/22/2011 9:00 AM Navkirat Singh said...
> Hi Guys,
>
> I have been a python developer for a bit now and for the life of me I am
> not being able to decide something. I am trying to develop a web based
> application in python. I am torn between using python 2 or 3. All the
> good frameworks are still in 2.x. Now, cherrypy, sqlalchemy and jinja2
> support python 3. But do I really want to do all the boilerplate work
> again? I have this strong urge to use python 3 and call it my
> indecisiveness , I am somehow not wanting to use 2.x, though it has
> everything I need to build my app. Hence, I finally decided to turn to
> the community for helping me make this decision.
>

I'd consider the development timeframe -- if it'll still be under 
development within the timeframe of migration and availability of 
desired tools then I'd start with 3 and focus on those parts that can be 
worked on.  If your development timeframe is measured in weeks instead 
of quarters or years, I'd just get it done with 2.

Emile





From atherun at gmail.com  Thu Sep 22 14:19:28 2011
From: atherun at gmail.com (Atherun)
Date: Thu, 22 Sep 2011 11:19:28 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
Message-ID: <ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>

On Sep 22, 10:44?am, Nobody <nob... at nowhere.com> wrote:
> On Thu, 22 Sep 2011 08:55:40 -0700, Atherun wrote:
> >> Just handle process.stdout/stderr by yourself - read it out until EOF
> >> and then wait() for the process.
>
> > Thats what confuses me though, the documentation says
> > process.stdout.read()/stderr.read() can deadlock and apparently so can
> > communicate, how do you read the stdout/stderr on yourself if its
> > documented using them can cause a deadlock?
>
> If you try to read/write two or more of stdin/stdout/stderr via the
> "naive" approach, you run the risk of the child process writing more than
> a pipe's worth of data to one stream (and thus blocking) while the
> parent is performing a blocking read/write on another stream, resulting in
> deadlock.
>
> The .communicate() method avoids the deadlock by either:
>
> 1. On Unix, using non-blocking I/O and select(), or
> 2. On Windows, creating a separate thread for each stream.
>
> Either way, the result is that it can always read/write whichever
> streams are ready, so the child will never block indefinitely while
> waiting for the parent.
>
> If .communicate() is blocking indefinitely, it suggests that the child
> process never terminates. There are many reasons why this might happen,
> and most of them depend upon exactly what the child process is doing.
>
> I suggest obtaining a copy of Process Explorer, and using it to
> investigate the state of both processes (but especially the child) at the
> point that the "deadlock" seems to occur.

In the one case I can easily reproduce, its in a p4.exe call that I'm
making both python and p4.exe have nearly the same stack for their
threads:
python:

ntoskrnl.exe!memset+0x64a
ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!__misaligned_access+0xba4
ntoskrnl.exe!__misaligned_access+0x1821
ntoskrnl.exe!KeWaitForMultipleObjects+0xf5d
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!NtWaitForSingleObject+0xde
ntoskrnl.exe!KeSynchronizeExecution+0x3a43
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x6c0
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x4a8
wow64.dll!Wow64SystemServiceEx+0x1ce
wow64.dll!Wow64LdrpInitialize+0x429
ntdll.dll!RtlUniform+0x6e6
ntdll.dll!RtlCreateTagHeap+0xa7
ntdll.dll!LdrInitializeThunk+0xe
ntdll.dll!ZwWaitForSingleObject+0x15
kernel32.dll!WaitForSingleObjectEx+0x43
kernel32.dll!WaitForSingleObject+0x12
python26.dll!_Py_svnversion+0xcf8


p4:

ntoskrnl.exe!memset+0x64a
ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
ntoskrnl.exe!KeWaitForSingleObject+0x19f
ntoskrnl.exe!_misaligned_access+0xba4
ntoskrnl.exe!_misaligned_access+0x1821
ntoskrnl.exe!KeWaitForMultipleObjects+0xf5d
ntoskrnl.exe!KeWaitForSingleObject+0x19f
ntoskrnl.exe!NtCreateFile+0x4c9
ntoskrnl.exe!NtWriteFile+0x7e3
ntoskrnl.exe!KeSynchronizeExecution+0x3a43
ntdll.dll!ZwWriteFile+0xa
KERNELBASE.dll!WriteFile+0x7b
kernel32.dll!WriteFile+0x36
p4.exe+0x42d4b
p4.exe+0x42ed8


To me it looks like they're both waiting on each other.



From mattj.morrison at gmail.com  Thu Sep 22 17:14:39 2011
From: mattj.morrison at gmail.com (Matt)
Date: Thu, 22 Sep 2011 14:14:39 -0700 (PDT)
Subject: Python Mixins
Message-ID: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>

I'm curious about what people's opinions are about using mixins in
Python. I really like, for example, the way that class based views
were implemented in Django 1.3 using mixins. It makes everything
extremely customizable and reusable. I think this is a very good
practice to follow, however, in Python mixins are achieved by using
(or perhaps misusing) inheritance and often multiple inheritance.

Inheritance is a very powerful tool, and multiple inheritance is an
even more powerful tool. These tools have their uses, but I feel like
"mixing in" functionality is not one of them. There are much different
reasons and uses for inheriting functionality from a parent and mixing
in functionality from elsewhere.

As a person, you learn certain things from your parents, you learn
other things from your peers all of those things put together becomes
you. Your peers are not your parents, that would not be possible. You
have completely different DNA and come from a completely different
place.

In terms of code, lets say we have the following classes:

class Animal
class Yamlafiable
class Cat(Animal, Yamlafiable)
class Dog(Animal, Yamlafiable)

I've got an Animal that does animal things, a Cat that does cat things
and a Dog that does dog things. I've also got a Yamlafiable class that
does something clever to generically convert an object into Yaml in
some way. Looking at these classes I can see that a Cat is an Animal,
a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
Yamlafiable? and a Cat is a Yamlafiable? Is that really true? If my
objects are categorized correctly, in the correct inheritance
hierarchy shouldn't that make more sense? Cats and Dogs aren't
Yamlafiable, that doesn't define what they are, rather it defines
something that they can do because of things that they picked up from
their friend the Yamlafile.

This is just a ridiculous example, but I think it is valid to say that
these things shouldn't be limited to inherit functionality only from
their parents, that they can pick other things up along the way as
well. Which is easy to do, right?

Dog.something_new = something_new

(I wish my stupid dog would learn that easily)

Ideally, what I would like to see is something like Ruby's mixins. It
seems to me like Ruby developed this out of necessity due to the fact
that it does not support multiple inheritance, however I think the
implementation is much more pure than inheriting from things that
aren't your parents. (although having only a single parent doesn't
make much sense either, I believe there are very few actual documented
cases of that happening). Here is a Ruby snippet:

module ReusableStuff
    def one_thing
        "something cool"
    end
end
class MyClass < MyParent
    include ReusableStuff
end

x = MyClass.new
x.one_thing == "something cool"
MyClass.superclass == Object

So I'm inheriting from MyParent and mixing in additional functionality
from ReusableStuff without affecting who my Parents are. This, to me,
makes much more sense than using inheritance to just grab a piece of
functionality that I want to reuse. I wrote a class decorator for
Python that does something similar (https://gist.github.com/1233738)
here is a snippet from that:

class MyMixin(object):
    def one_thing(self):
        return "something cool"

@mixin(MyMixin)
class MyClass(object):
    pass

x = MyClass()
x.one_thing() == 'something cool'
x.__class__.__bases__ ==  (object,)

To me, this is much more concise. By looking at this I can tell what
MyClass IS, who it's parents are and what else it can do. I'm very
interested to know if there are others who feel as dirty as I do when
using inheritance for mixins or if there are other things that Python
developers are doing to mix in functionality without using inheritance
or if the general populous of the Python community disagrees with me
and thinks that this is a perfectly valid use of inheritance.

I look forward to hearing back.

Thanks,
Matthew J Morrison
www.mattjmorrison.com


P.S. - This is a good article about not using inheritance as a code
reuse tool: http://littletutorials.com/2008/06/23/inheritance-not-for-code-reuse/


From rantingrick at gmail.com  Thu Sep 22 17:44:03 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 22 Sep 2011 14:44:03 -0700 (PDT)
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <1b1998c1-150c-49d5-b42b-56fe117e7ad6@eb1g2000vbb.googlegroups.com>

On Sep 22, 4:14?pm, Matt <mattj.morri... at gmail.com> wrote:

> (although having only a single parent doesn't
> make much sense either, I believe there are very few actual documented
> cases of that happening).

There is nothing wrong with an object having only one parent. Most
times the reasons are for maintainability. I might have a TextEditor
that exposes all the generic functionality that are ubiquitous to text
editors and then a FancyTextEditor(TextEditor) that exposes
functionality that is unique to a confined set of text editing uses. A
silly example, but proves the point. Do not judge an object by the
number of prodigy.


From t at jollybox.de  Thu Sep 22 18:09:08 2011
From: t at jollybox.de (Thomas Jollans)
Date: Fri, 23 Sep 2011 00:09:08 +0200
Subject: Python Mixins
In-Reply-To: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <4E7BB204.90902@jollybox.de>

On 2011-09-22 23:14, Matt wrote:
> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins. It makes everything
> extremely customizable and reusable. I think this is a very good
> practice to follow, however, in Python mixins are achieved by using
> (or perhaps misusing) inheritance and often multiple inheritance.
> 
> Inheritance is a very powerful tool, and multiple inheritance is an
> even more powerful tool. These tools have their uses, but I feel like
> "mixing in" functionality is not one of them. There are much different
> reasons and uses for inheriting functionality from a parent and mixing
> in functionality from elsewhere.
> 
> As a person, you learn certain things from your parents, you learn
> other things from your peers all of those things put together becomes
> you. Your peers are not your parents, that would not be possible. You
> have completely different DNA and come from a completely different
> place.
> 
> In terms of code, lets say we have the following classes:
> 
> class Animal
> class Yamlafiable
> class Cat(Animal, Yamlafiable)
> class Dog(Animal, Yamlafiable)
> 

I think this is an excellent use of multiple inheritance. One could also
have a construction like this:

class Dog (Animal)
class YamlafialbleDog (Dog, Yamlafiable)

... which you may be more comfortable with. In you above example, yes, a
Dog object is a Yamlafiable object. If you need a Yamlafiable object,
you can use a Cat or Dog. That's what inheritance is about.

In Python or Ruby, this way of doing things is not all that different
from the one you present below. Here, it doesn't really matter. In
strictly typed languages, it makes a world of difference. What if you
don't care what kind of object you're dealing with, as long as it
supports the interface a certain mixin provides? In Python, true, duck
typing will do the trick. In C++, for example, where you could use the C
preprocessor to do something like Ruby mixins, multiple inheritance is a
lot more useful for mixing in something that has a public interface.

The Vala language, and, I suppose the GObject type system, actually
allows interfaces to act as mixins. This is really a more formalised way
of doing just this: using multiple inheritance (which, beyond
interfaces, Vala does not support) to mix in functionality.

Oh and your thing looks kind of neat.

Thomas

> I've got an Animal that does animal things, a Cat that does cat things
> and a Dog that does dog things. I've also got a Yamlafiable class that
> does something clever to generically convert an object into Yaml in
> some way. Looking at these classes I can see that a Cat is an Animal,
> a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
> Yamlafiable? and a Cat is a Yamlafiable? Is that really true? If my
> objects are categorized correctly, in the correct inheritance
> hierarchy shouldn't that make more sense? Cats and Dogs aren't
> Yamlafiable, that doesn't define what they are, rather it defines
> something that they can do because of things that they picked up from
> their friend the Yamlafile.
> 
> This is just a ridiculous example, but I think it is valid to say that
> these things shouldn't be limited to inherit functionality only from
> their parents, that they can pick other things up along the way as
> well. Which is easy to do, right?
> 
> Dog.something_new = something_new
> 
> (I wish my stupid dog would learn that easily)
> 
> Ideally, what I would like to see is something like Ruby's mixins. It
> seems to me like Ruby developed this out of necessity due to the fact
> that it does not support multiple inheritance, however I think the
> implementation is much more pure than inheriting from things that
> aren't your parents. (although having only a single parent doesn't
> make much sense either, I believe there are very few actual documented
> cases of that happening). Here is a Ruby snippet:
> 
> module ReusableStuff
>     def one_thing
>         "something cool"
>     end
> end
> class MyClass < MyParent
>     include ReusableStuff
> end
> 
> x = MyClass.new
> x.one_thing == "something cool"
> MyClass.superclass == Object
> 
> So I'm inheriting from MyParent and mixing in additional functionality
> from ReusableStuff without affecting who my Parents are. This, to me,
> makes much more sense than using inheritance to just grab a piece of
> functionality that I want to reuse. I wrote a class decorator for
> Python that does something similar (https://gist.github.com/1233738)
> here is a snippet from that:
> 
> class MyMixin(object):
>     def one_thing(self):
>         return "something cool"
> 
> @mixin(MyMixin)
> class MyClass(object):
>     pass
> 
> x = MyClass()
> x.one_thing() == 'something cool'
> x.__class__.__bases__ ==  (object,)
> 
> To me, this is much more concise. By looking at this I can tell what
> MyClass IS, who it's parents are and what else it can do. I'm very
> interested to know if there are others who feel as dirty as I do when
> using inheritance for mixins or if there are other things that Python
> developers are doing to mix in functionality without using inheritance
> or if the general populous of the Python community disagrees with me
> and thinks that this is a perfectly valid use of inheritance.
> 
> I look forward to hearing back.
> 
> Thanks,
> Matthew J Morrison
> www.mattjmorrison.com
> 
> 
> P.S. - This is a good article about not using inheritance as a code
> reuse tool: http://littletutorials.com/2008/06/23/inheritance-not-for-code-reuse/



From tjreedy at udel.edu  Thu Sep 22 18:56:54 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 22 Sep 2011 18:56:54 -0400
Subject: Context manager with class methods
In-Reply-To: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
Message-ID: <j5gefq$p0k$1@dough.gmane.org>

On 9/22/2011 6:21 AM, Gavin Panella wrote:

> On Python 2.6 and 3.1 the following code works fine:
>      class Foo(object):
>          @classmethod
>          def __enter__(cls):
>              print("__enter__")
>          @classmethod
>          def __exit__(cls, exc_type, exc_value, traceback):
>              print("__exit__")
>
>      with Foo: pass

This could be regarded as a bug, see below.

> However, in 2.7 and 3.2 I get:
>
>      Traceback (most recent call last):
>        File "<stdin>", line 1, in<module>
>      AttributeError: __exit__

type(Foo) == type and type has no such attribute.

Unless otherwise specified, 'method' typically means 'instance method'. 
In particular, the '__xxx__' special methods are (all?) (intended to be) 
instance methods, which is to say, functions that are attributes of an 
object's class. So it is normal to look for special methods on the class 
(and superclasses) of an object rather than starting with the object 
itself. For instance, when executing 'a+b', the interpreter never looks 
for __add__ as an attribute of a itself (in a.__dict__)
but starts the search looking for with type(a).__add__

> Is this a regression or a deliberate change? Off the top of my head I
> can't think that this pattern is particularly useful, but it seems
> like something that ought to work.

I suspect there was a deliberate change to correct an anomaly, though 
this might have been done as part of some other change. As Thomas noted, 
*instances* of Foo work and as Mei noted, making Foo an instance of a 
(meta)class with the needed methods also works.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Thu Sep 22 19:14:42 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 22 Sep 2011 19:14:42 -0400
Subject: Negativ nearest interger?
In-Reply-To: <qot7h50vm28.fsf@ruuvi.it.helsinki.fi>
References: <485699e2-7cfd-4614-bf77-906ae84547e5@h6g2000vbc.googlegroups.com>
	<qot7h50vm28.fsf@ruuvi.it.helsinki.fi>
Message-ID: <j5gfh6$v6c$1@dough.gmane.org>

On 9/22/2011 7:44 AM, Jussi Piitulainen wrote:
> joni writes:

>> Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56)
> ...
>>>>> -7/3
>> -3

In late Python 2 you *can* and in Python 3 you *must* use // rather than 
/ to get an int result.

>> -3 are more wrong than -2. Negativ number seems not to round to
>> nearest interger, but the integer UNDER the anwser!! Or?
>> Why?
>
> It simply does not round to the nearest integer. It floors. This has
> nicer mathematical properties. In particular, it allows the remainder
> (notated as "per cent") operation (n % m) to return a number that
> differs from n by a multiple of m ("is congruent to n modulo m").
> These two operations go together.

The Python doc set has a FAQ collection. I recommend you read the 
questions for those you might be interested in. In the Programming FAQ:

"Why does -22 // 10 return -3?

It?s primarily driven by the desire that i % j have the same sign as j. 
If you want that, and also want:

i == (i // j) * j + (i % j)
then integer division has to return the floor. C also requires that 
identity to hold, and then compilers that truncate i // j need to make i 
% j have the same sign as i.

There are few real use cases for i % j when j is negative. When j is 
positive, there are many, and in virtually all of them it?s more useful 
for i % j to be >= 0. If the clock says 10 now, what did it say 200 
hours ago? -190 % 12 == 2 is useful; -190 % 12 == -10 is a bug waiting 
to bite."





-- 
Terry Jan Reedy




From rosuav at gmail.com  Thu Sep 22 19:22:44 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 23 Sep 2011 09:22:44 +1000
Subject: random.randint() slow, esp in Python 3
In-Reply-To: <4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmp__Uz8CGEpb0wKDCseWVfk2o6AiUztof7LPJG5xKTdWg@mail.gmail.com>

On Fri, Sep 23, 2011 at 4:14 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> What makes you think it's in C? I don't have Python 3.3a, but in 3.2 the
> random module is mostly Python. There is an import of _random, which
> presumably is in C, but it doesn't have a randint method:

True. It seems to be defined in cpython/lib/random.py as a reference
to randrange, which does a pile of error checking and calls
_randbelow... which does a whole lot of work as well as calling
random(). Guess I should have checked the code before asking!

There's probably good reasons for using randint(), but if you just
want a pile of more-or-less random integers, int(random.random()*top)
is the best option.

> I'm not seeing any significant difference in speed between 2.6 and 3.2:
>
> [steve at sylar ~]$ python2.6 -m timeit -s "from random import
> randint" "randint(0, 1000000)"
> 100000 loops, best of 3: 4.29 usec per loop
>
> [steve at sylar ~]$ python3.2 -m timeit -s "from random import
> randint" "randint(0, 1000000)"
> 100000 loops, best of 3: 4.98 usec per loop

That might be getting lost in the noise. Try the list comp that I had
above and see if you can see a difference - or anything else that
calls randint that many times.

Performance-testing with a heapsort (and by the way, it's
_ridiculously_ slower implementing it in Python instead of just
calling a.sort(), but we all knew that already!) shows a similar
difference in performance. As far as I know, everything's identical
between the two (I use // division so there's no floating point
getting in the way, for instance), but what takes 90 seconds on Py2
takes 150 seconds on Py3. As with the randint test, I switched int()
to long() to test Py2, and that slowed it down a little, but still far
far below the Py3 time.

I've pasted the code I'm using here: http://pastebin.com/eQPHQhD0

Where's the dramatic performance difference? Or doesn't it matter,
since anything involving this sort of operation needs to be done in C
anyway?

ChrisA


From skippy.hammond at gmail.com  Thu Sep 22 19:47:12 2011
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 23 Sep 2011 09:47:12 +1000
Subject: PyEval_EvalCodeEx return value
In-Reply-To: <4E786C42.3050309@loskot.net>
References: <4E786C42.3050309@loskot.net>
Message-ID: <4E7BC900.9010103@gmail.com>

On 20/09/2011 8:34 PM, Mateusz Loskot wrote:
> Hi,
>
> I'm trying to dig out details about what exactly is the return
> value the of PyEval_EvalCodeEx function in Python 3.x
> The documentation is sparse, unfortunately.
>
> Perhaps I'm looking at wrong function.
> My aim is simple, I need to execute Python code using Python interpreter
> embedded in my C++ application.
> The Python code is a simple script that always returns single value.
> For example:
>
> #! /usr/bin/env python
> def foo(a, b):
> return a + b
> f = foo(2, 3)
>
> But, f can be of different type for different script: one returns
> numeric value, another returns a sequence, so the type is not
> possible to be determined in advance.
>
> I know how to capture Python stdout/stderr.
>
> I also know how to access the "f" attribute using
> PyObject_GetAttrString and then I can convert "f" value to C++ type
> depending on PyObject type.
>
> However, I guess there shall be a way to access "f" value
> directly from PyEval_EvalCode return object:
>
> PyObject* evalRet = ::PyEval_EvalCode(...);
>
> But, I can't find any details what the "evalRet" actually is.

Eval is to eval an expression.  If you simply eval the expression "f" in 
the context of the module you should get the result returned.  Obviously 
though it is designed to eval more complex expressions and in your 
specific example, doing the getattr thing will also work fine.

Mark


From jesus.ramirez.utexas at gmail.com  Thu Sep 22 20:36:45 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Thu, 22 Sep 2011 17:36:45 -0700 (PDT)
Subject: Python 2.5 zlib trouble
Message-ID: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>

Hello,

I am trying to deploy an app on google app engine using bottle, a
micro-framework, similar to flask. I am running on ubuntu which comes
with python 2.7 installed but GAE needs version 2.5, so I installed
2.5. I then realized I didn't use make altinstall so I may have a
default version problem now. But my real problem is that when I try to
use the gae server to test locally I get the following error:

Traceback (most recent call last):
  File "/opt/google/appengine/dev_appserver.py", line 77, in <module>
    run_file(__file__, globals())
  File "/opt/google/appengine/dev_appserver.py", line 73, in run_file
    execfile(script_path, globals_)
  File "/opt/google/appengine/google/appengine/tools/
dev_appserver_main.py", line 156, in <module>
    from google.appengine.tools import dev_appserver
  File "/opt/google/appengine/google/appengine/tools/
dev_appserver.py", line 94, in <module>
    import zlib
ImportError: No module named zlib



Can you help me with this?


From anacrolix at gmail.com  Fri Sep 23 01:44:25 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Fri, 23 Sep 2011 15:44:25 +1000
Subject: python install on locked down windows box?
In-Reply-To: <4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1357.1316683648.27778.python-list@python.org>
	<4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAB4yi1NYEBSoeLTsY-fDoXmbdjx7SEv6_G5CDtjBckMRRijiAA@mail.gmail.com>

5 is the best solution, followed by 2 and 3.
On Sep 22, 2011 11:02 PM, "Steven D&apos;Aprano" <
steve+comp.lang.python at pearwood.info> wrote:
> Chris Withers wrote:
>
>> Hi All,
>>
>> Is there a way to install python on a locked down Windows desktop?
>> (ie: no compilers, no admin rights, etc)
>
> (1) Bribe or blackmail the fascist system administrator.
>
> (2) Hack into the system with any of dozens of unpatched vulnerabilities
> that will give you admin rights.
>
> (3) Sneak into the office at 3 in the morning and replace the desktop with
> an identical machine which you have admin rights to.
>
> (4) Guess the admin password -- it's not hard, most fascist system
> administrators can't remember words with more than four letters, so the
> password is probably something like "passw" or, if he's being especially
> cunning, "drows".
>
> (5) "Accidentally" install Linux on the machine and use that instead.
>
> (6) Take hostages.
>
> (7) If all else fails, as an absolute last resort, simply run the Windows
> installer as a regular, unprivileged user, after selecting the option for
a
> Non-Admin Install under Advanced Options first. You could also try the
> ActivePython installer.
>
>
http://www.richarddooling.com/index.php/2006/03/14/python-on-xp-7-minutes-to-hello-world/
> http://diveintopython.org/installing_python/windows.html
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
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From nobody at nowhere.com  Fri Sep 23 01:59:12 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 23 Sep 2011 06:59:12 +0100
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
Message-ID: <pan.2011.09.23.05.59.12.10000@nowhere.com>

On Thu, 22 Sep 2011 11:19:28 -0700, Atherun wrote:

>> I suggest obtaining a copy of Process Explorer, and using it to
>> investigate the state of both processes (but especially the child) at the
>> point that the "deadlock" seems to occur.
> 
> In the one case I can easily reproduce, its in a p4.exe call that I'm
> making both python and p4.exe have nearly the same stack for their
> threads:
> python:

> kernel32.dll!WaitForSingleObject+0x12
> python26.dll!_Py_svnversion+0xcf8

I haven't a clue how this happens. _Py_svnversion just returns a string:

_Py_svnversion(void)
{
    /* the following string can be modified by subwcrev.exe */
    static const char svnversion[] = SVNVERSION;
    if (svnversion[0] != '$')
        return svnversion; /* it was interpolated, or passed on command line */
    return "Unversioned directory";
}

It doesn't even 


From rosuav at gmail.com  Fri Sep 23 03:08:39 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 23 Sep 2011 17:08:39 +1000
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <pan.2011.09.23.05.59.12.10000@nowhere.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
Message-ID: <CAPTjJmpOS11=q9S9FUT41bBeJ6vBc3dR14cyVgTpMyr9NV8_AQ@mail.gmail.com>

On Fri, Sep 23, 2011 at 3:59 PM, Nobody <nobody at nowhere.com> wrote:
> It doesn't even
>

You intrigue me, sir. Does it odd?

What is the remainder of this aborted sentence?

ChrisA


From chris at simplistix.co.uk  Fri Sep 23 03:46:41 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 23 Sep 2011 08:46:41 +0100
Subject: TestFixtures 2.0.0 Released!
Message-ID: <4E7C3961.8020107@simplistix.co.uk>

Hi All,

I'm happy to announce a new release major release of TestFixtures.
This release is 99% backwards compatible, but a lot has changed under 
the hood and there's some major new functionality, so thought it was 
time for a bump.

The big changes are:

- compare now uses a registry of comparers in the same way that
   unitest2's assertEquals does. You can register your own globally,
   register the default comparers for your own types and use a specific
   registry for a specific call to compare.

- The handling of timezones has been reworked in `test_datetime` again.
   (did anyone ever mention that timezones are hard ;-) )
   It feels more intuitive now, but it is backwards incompatible in
   the case where the `tzinfo` parameter to the `test_datetime`
   constructor was used.

   For details, read:

   http://packages.python.org/testfixtures/datetime.html#timezones

The full list of changes can be found here:

http://packages.python.org/testfixtures/changes.html

The package is on PyPI and a full list of all the links to docs, issue 
trackers and the like can be found here:

http://www.simplistix.co.uk/software/python/testfixtures

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
            - http://www.simplistix.co.uk


From steve+comp.lang.python at pearwood.info  Fri Sep 23 04:11:03 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 23 Sep 2011 18:11:03 +1000
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
Message-ID: <4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>

Jesramz wrote:

> Hello,
> 
> I am trying to deploy an app on google app engine using bottle, a
> micro-framework, similar to flask.
[...]
> ImportError: No module named zlib


What happens if you explicitly launch Python2.5 and then try to import zlib?



-- 
Steven



From andrea.crotti.0 at gmail.com  Fri Sep 23 05:12:10 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 10:12:10 +0100
Subject: extending class
Message-ID: <4E7C4D6A.8050107@gmail.com>

I wanted to add a couple of parameters to a class from a given library 
(paste-script), but without changing the original code.
So I thought, I create a wrapper class which adds what I need, and then 
dispatch all the calls to the super class.

My following attempt gives, however, a recursion error, but why?

class PSIVar(object):
     """Extend var implementation from the paste-script, to add the
     ability of correlating variables
 >>> v = var("name", "desc")
 >>> v.name == 'name'
     True
 >>> v1 = PSIVar(v)
 >>> v1.name == 'name'
     True
     """
     def __init__(self, first_var, other=None, fun=None):
         # this is of type defined there
         self.first_var = first_var
         if other is not None:
             self.other = other
             self.fun = fun
             assert callable(self.fun)

     # now try to dispatch every method call to the other class
     # must probably call the super class
     def __getattribute__(self, attr):
         return self.first_var.__getattribute__(attr)



From duncan.booth at invalid.invalid  Fri Sep 23 05:19:09 2011
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 23 Sep 2011 09:19:09 GMT
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <Xns9F6968F29F9F1duncanbooth@127.0.0.1>

Matt <mattj.morrison at gmail.com> wrote:

> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins. It makes everything
> extremely customizable and reusable. I think this is a very good
> practice to follow, however, in Python mixins are achieved by using
> (or perhaps misusing) inheritance and often multiple inheritance.
> 

I think Mixins are great, in moderation, but wait until you have to debug 
code on an object with 70 base classes.

Reinout van Rees wrote a very insightful article recently about Django's 
use of multiple inheritance:

http://reinout.vanrees.org/weblog/2011/08/23/class-based-views.html

He points out the problems that arise from overuse of mixins; why Zope went 
through so much upheaval to get away from mixins everywhere and switched to 
a component architecture instead; and suggests that Django will do the same 
in a few years time.


-- 
Duncan Booth http://kupuguy.blogspot.com


From __peter__ at web.de  Fri Sep 23 05:31:30 2011
From: __peter__ at web.de (Peter Otten)
Date: Fri, 23 Sep 2011 11:31:30 +0200
Subject: extending class
References: <4E7C4D6A.8050107@gmail.com>
Message-ID: <j5hjlj$him$1@dough.gmane.org>

Andrea Crotti wrote:

> I wanted to add a couple of parameters to a class from a given library
> (paste-script), but without changing the original code.
> So I thought, I create a wrapper class which adds what I need, and then
> dispatch all the calls to the super class.
> 
> My following attempt gives, however, a recursion error, but why?

Inside __getattribute__() you ask for self.first_var which triggers another 
__getattribute__() call that once again trys to determine the first_var 
attribute before it returns...

Try using __getattr__() instead which is only triggered for non-existent 
attributes 

def __getattr__(self, name):
    return getattr(self.first_var, name)

or check for the attributes you don't want to delegate explicitly:

def __getattribute__(self, name):
    if name == "first_var":
        return super(PSIVar, self).__getattribute__(name)
    return getattr(self.first_var, name)

> class PSIVar(object):
>      """Extend var implementation from the paste-script, to add the
>      ability of correlating variables
>  >>> v = var("name", "desc")
>  >>> v.name == 'name'
>      True
>  >>> v1 = PSIVar(v)
>  >>> v1.name == 'name'
>      True
>      """
>      def __init__(self, first_var, other=None, fun=None):
>          # this is of type defined there
>          self.first_var = first_var
>          if other is not None:
>              self.other = other
>              self.fun = fun
>              assert callable(self.fun)
> 
>      # now try to dispatch every method call to the other class
>      # must probably call the super class
>      def __getattribute__(self, attr):
>          return self.first_var.__getattribute__(attr)




From andrea.crotti.0 at gmail.com  Fri Sep 23 05:35:49 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 10:35:49 +0100
Subject: extending class
In-Reply-To: <j5hjlj$him$1@dough.gmane.org>
References: <4E7C4D6A.8050107@gmail.com> <j5hjlj$him$1@dough.gmane.org>
Message-ID: <4E7C52F5.5060301@gmail.com>

On 09/23/2011 10:31 AM, Peter Otten wrote:
>
> Inside __getattribute__() you ask for self.first_var which triggers another
> __getattribute__() call that once again trys to determine the first_var
> attribute before it returns...
>
> Try using __getattr__() instead which is only triggered for non-existent
> attributes
>
> def __getattr__(self, name):
>      return getattr(self.first_var, name)
>
> or check for the attributes you don't want to delegate explicitly:
>
> def __getattribute__(self, name):
>      if name == "first_var":
>          return super(PSIVar, self).__getattribute__(name)
>

Right thanks a lot it works perfectly.
I don't like too much, however, to mess around in this way, maybe it's 
better if I just fork the project
and patch the original code.

In this way maybe I can also contribute to it with patches (if they are 
accepted)...


From mateusz at loskot.net  Fri Sep 23 05:54:43 2011
From: mateusz at loskot.net (Mateusz Loskot)
Date: Fri, 23 Sep 2011 10:54:43 +0100
Subject: PyEval_EvalCodeEx return value
In-Reply-To: <4E7BC900.9010103@gmail.com>
References: <4E786C42.3050309@loskot.net> <4E7BC900.9010103@gmail.com>
Message-ID: <4E7C5763.3060106@loskot.net>

On 23/09/11 00:47, Mark Hammond wrote:
> On 20/09/2011 8:34 PM, Mateusz Loskot wrote:
>>
>> I'm trying to dig out details about what exactly is the return
>> value the of PyEval_EvalCodeEx function in Python 3.x
>> The documentation is sparse, unfortunately.
>>
>> Perhaps I'm looking at wrong function.
>> My aim is simple, I need to execute Python code using Python interpreter
>> embedded in my C++ application.
>> The Python code is a simple script that always returns single value.
>> For example:
>>
>> #! /usr/bin/env python
>> def foo(a, b):
>> return a + b
>> f = foo(2, 3)
>>
>> But, f can be of different type for different script: one returns
>> numeric value, another returns a sequence, so the type is not
>> possible to be determined in advance.
>>
>> I know how to capture Python stdout/stderr.
>>
>> I also know how to access the "f" attribute using
>> PyObject_GetAttrString and then I can convert "f" value to C++ type
>> depending on PyObject type.
>>
>> However, I guess there shall be a way to access "f" value
>> directly from PyEval_EvalCode return object:
>>
>> PyObject* evalRet = ::PyEval_EvalCode(...);
>>
>> But, I can't find any details what the "evalRet" actually is.
>
> Eval is to eval an expression. If you simply eval the expression "f" in
> the context of the module you should get the result returned. Obviously
> though it is designed to eval more complex expressions and in your
> specific example, doing the getattr thing will also work fine.

Hi Mark,

So, the result of PyEval_EvalCode strictly depends on the code being 
evaluated. It makes sense.

Thanks for help!

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org
Member of ACCU, http://accu.org


From gelonida at gmail.com  Fri Sep 23 06:23:57 2011
From: gelonida at gmail.com (Gelonida N)
Date: Fri, 23 Sep 2011 12:23:57 +0200
Subject: cProfile and name spaces.
Message-ID: <j5hmo1$6mi$1@dough.gmane.org>

Hi

I have following piece of code in file f1.py

##### f1.py starts here #######
def f():
    pass

def main():
    import profile
    profile.run('f()')

if __name__ == '__main__':
    main()
# ------ end of f1.py ----


executing f1.py works as expected.

Now I have a file f2.py
##### f2.py starts here #######
import f1
f1.main()
# ------ end of f2.py ----


If I run f2.py

I get the error message:
. . . .
>   File "C:\Python26\lib\profile.py", line 70, in run
>     prof = prof.run(statement)
>   File "C:\Python26\lib\profile.py", line 456, in run
>     return self.runctx(cmd, dict, dict)
>   File "C:\Python26\lib\profile.py", line 462, in runctx
>     exec cmd in globals, locals
>   File "<string>", line 1, in <module>
> NameError: name 'f' is not defined

So  cProfile doesn't find my function f any more.

I can fix this by changing the code in f1.py to

profile.run('f1.f()')

However now I can't run f1.py anymore.


Is it intentional, that cProfile always uses the name space of the
initial module?

I consider it surprising especially as I did not find any mentioning of
this particularity in the documentation, which states:


> cProfile.run(command[, filename])
> 
> This function takes a single argument that can be passed to the exec
> statement, and an optional file name. In all cases this routine attempts
> to exec its first argument, and gather profiling statistics from the
> execution. If no file name is present, then this function automatically
> prints a simple profiling report, sorted by the standard name string
> (file/line/function-name) that is presented in each line. The following
> is a typical output from such a call:


I'm using python 2.6.5

The reason why I don't profile at the top level is, that I do not want
to profile some parts of the code and as I want to
conditionally profile  a cetain function within different contexts /
applications

WI have also difficulties implementing something like this in a module,
which
is not the main module.

arg1 = f(1)
arg2 = f2()
if do_profile:
    CProfile('result = function_name(arg1, arg2)', fname)
else:
    result = function_name(arg1, arg2)


Any tips / suggestions??












From andrea.crotti.0 at gmail.com  Fri Sep 23 07:02:00 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 12:02:00 +0100
Subject: Develop inter-dependent eggs
Message-ID: <4E7C6728.7040500@gmail.com>

Develop inter-dependent eggs:

On a Linux machine I have many eggs to develop, for example

- egg1
- egg2
...

Now the eggs depend from each other, so running
"python setup.py develop" in order, doesn't work, because if the 
dependency required is not already installed then easy_install tries to 
fetch it from PyPi.

I looked around everywhere, but I can't find any feasible option, how do 
I tell easy_install to install the dependencies needed from a filesystem 
position and not from the PyPi server?


From yasar11732 at gmail.com  Fri Sep 23 07:44:27 2011
From: yasar11732 at gmail.com (=?ISO-8859-9?Q?Ya=FEar_Arabac=FD?=)
Date: Fri, 23 Sep 2011 14:44:27 +0300
Subject: Need help with file encoding-decoding
Message-ID: <CAFEUn8Y1sEti_3wb4nZkKhCVtjrQQsYkSszWbp8ZWsyT+xQ4rQ@mail.gmail.com>

Hi,

I'am trying to write a mass html downloader, and it processes files after it
downloaded them. I have problems with encodings, and decodings. Sometimes I
get UnicodeDecodeErrors, or
I get half-pages in after processing part. Or more generally, some things
don't feel right. Can you check my approach, and provide me some feedback
please? Here is what I am doing.

1) send a HEAD request to file's source to get file encoding, set encoding
variable accordingly.
2) if server doesn't provide an encoding, set encoding variable as utf-8
3) read html page from internet, read it to a variable let's say content.
4) in this step, I need to parse the content I get, because I will search
for further links \
        I feed content to parser (subclass of HTMLParser.HTMLParser) like
this -> content.decode(encoding)
5) open a file in binary mod open(file_path,"wb")
6) I write as I read without modifing.

##########
# After processing part....
##########

(Note: encoding variable is same as the downloading part)

1) open local file in binary mod for reading file_name =
open(file_path,"rb")
2) decode the file contents into a variable => decoded_content =
file_name.read().decode(encoding)
3) send decoded content to a parser, parser contstruct new html content. (as
str)
4) open same file for writing, in binary mod, write parsers output like
this: file_name.write(parser.output.encode(encoding))
-- 
http://yasar.serveblog.net/
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From chris at simplistix.co.uk  Fri Sep 23 07:52:40 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 23 Sep 2011 12:52:40 +0100
Subject: [TIP] TestFixtures 2.0.0 Released!
In-Reply-To: <4E7C3961.8020107@simplistix.co.uk>
References: <4E7C3961.8020107@simplistix.co.uk>
Message-ID: <4E7C7308.7020709@simplistix.co.uk>

On 23/09/2011 08:46, Chris Withers wrote:
> I'm happy to announce a new release major release of TestFixtures.
> This release is 99% backwards compatible, but a lot has changed under
> the hood and there's some major new functionality, so thought it was
> time for a bump.

Of course, a 2.0.0 release wouldn't be complete without a fairly 
show-stopping lack of backwards compatibility... Thankfully, I've 
managed to return the case (comparison of generators with iterators) to 
its previous state with the 2.0.1 release I've just pushed out...

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From python at bdurham.com  Fri Sep 23 08:09:40 2011
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 23 Sep 2011 08:09:40 -0400
Subject: python install on locked down windows box?
In-Reply-To: <CAB4yi1NYEBSoeLTsY-fDoXmbdjx7SEv6_G5CDtjBckMRRijiAA@mail.gmail.com>
References: <mailman.1357.1316683648.27778.python-list@python.org><4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
	<CAB4yi1NYEBSoeLTsY-fDoXmbdjx7SEv6_G5CDtjBckMRRijiAA@mail.gmail.com>
Message-ID: <1316779780.12406.140258146888625@webmail.messagingengine.com>

Hi Matt,

Enjoyed your list options :)

I'm a consultant and have to do what your subject line asks at
most clients I work at.

Here's the technique I recommend:

Install Python for the ***current user*** on another workstation
with the appropriate priviledges. Then xcopy this Python folder
to a USB drive. Then xcopy this folder from your USB drive to a
matching folder on your locked down workstation.

The xcopy-ed version of Python will run without problems when you
start the python.exe executable from a command line with a python
script as a command line parameter. The only thing you won't be
able to do is click on .py* files and have them automatically
invoke the Python interpreter because file associations require
admin rights to update the registery. I don't consider this a big
deal.

Good luck!

Malcolm
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From philip at semanchuk.com  Fri Sep 23 09:14:15 2011
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 23 Sep 2011 09:14:15 -0400
Subject: Need help with file encoding-decoding
In-Reply-To: <CAFEUn8Y1sEti_3wb4nZkKhCVtjrQQsYkSszWbp8ZWsyT+xQ4rQ@mail.gmail.com>
References: <CAFEUn8Y1sEti_3wb4nZkKhCVtjrQQsYkSszWbp8ZWsyT+xQ4rQ@mail.gmail.com>
Message-ID: <6CE93FA9-E24F-4FB7-ABA2-24F2F611978A@semanchuk.com>


On Sep 23, 2011, at 7:44 AM, Ya?ar Arabac? wrote:

> Hi,
> 
> I'am trying to write a mass html downloader, and it processes files after it
> downloaded them. I have problems with encodings, and decodings. Sometimes I
> get UnicodeDecodeErrors, or
> I get half-pages in after processing part. Or more generally, some things
> don't feel right. Can you check my approach, and provide me some feedback
> please? Here is what I am doing.
> 
> 1) send a HEAD request to file's source to get file encoding, set encoding
> variable accordingly.

Hi Ya?ar
This is a pretty optimistic algorithm, at least by the statistics from 2008 (see below). 


> 2) if server doesn't provide an encoding, set encoding variable as utf-8

This is statistically a good guess but it doesn't follow the HTTP specification.


> 4) in this step, I need to parse the content I get, because I will search
> for further links \
>        I feed content to parser (subclass of HTMLParser.HTMLParser) like

Does HTMLParser.HTMLParser handle broken HTML? Because there's lots of it out there.

I used to run an automated site validator, and I wrote a couple of articles you might find interesting. One is about how to get the encoding of a Web page:
http://NikitaTheSpider.com/articles/EncodingDivination.html

I also wrote an article examining the statistics I'd seen run through the crawler/validator. One thing I saw was that almost 2/3 of Web pages specified the encoding in the META HTTP-EQUIV Content-Type tag rather than in the HTTP Content-Type header. Mind you, this was three years ago so the character of the Web has likely changed since then, but probably not too dramatically.
http://NikitaTheSpider.com/articles/ByTheNumbers/fall2008.html

You can also do some straightforward debugging. Save the raw bytes you get from each site, and when you encounter a decode error, check the raw bytes. Are they really in the encoding specified? Webmasters make all kinds of mistakes. 


Hope this helps
Philip



> this -> content.decode(encoding)
> 5) open a file in binary mod open(file_path,"wb")
> 6) I write as I read without modifing.
> 
> ##########
> # After processing part....
> ##########
> 
> (Note: encoding variable is same as the downloading part)
> 
> 1) open local file in binary mod for reading file_name =
> open(file_path,"rb")
> 2) decode the file contents into a variable => decoded_content =
> file_name.read().decode(encoding)
> 3) send decoded content to a parser, parser contstruct new html content. (as
> str)
> 4) open same file for writing, in binary mod, write parsers output like
> this: file_name.write(parser.output.encode(encoding))
> -- 
> http://yasar.serveblog.net/
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From jeanmichel at sequans.com  Fri Sep 23 09:17:53 2011
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 23 Sep 2011 15:17:53 +0200
Subject: extending class
In-Reply-To: <4E7C52F5.5060301@gmail.com>
References: <4E7C4D6A.8050107@gmail.com> <j5hjlj$him$1@dough.gmane.org>
	<4E7C52F5.5060301@gmail.com>
Message-ID: <4E7C8701.5020302@sequans.com>

Andrea Crotti wrote:
> On 09/23/2011 10:31 AM, Peter Otten wrote:
>>
>> Inside __getattribute__() you ask for self.first_var which triggers 
>> another
>> __getattribute__() call that once again trys to determine the first_var
>> attribute before it returns...
>>
>> Try using __getattr__() instead which is only triggered for non-existent
>> attributes
>>
>> def __getattr__(self, name):
>>      return getattr(self.first_var, name)
>>
>> or check for the attributes you don't want to delegate explicitly:
>>
>> def __getattribute__(self, name):
>>      if name == "first_var":
>>          return super(PSIVar, self).__getattribute__(name)
>>
>
> Right thanks a lot it works perfectly.
> I don't like too much, however, to mess around in this way, maybe it's 
> better if I just fork the project
> and patch the original code.
>
> In this way maybe I can also contribute to it with patches (if they 
> are accepted)...
Did you consider subclassing your Var class ? This is how you extend a 
class behavior in OOP.

class PSIVar(var):
    def __init__(self, name, desc, other=None, fun=None):
        var.__init__(self, name, desc)
        if other is not None:
            self.other = other
            self.fun = fun
            assert callable(self.fun)

v1 = PSIVar('name', 'desc')

that's it.

By the way, don't create instance attribute conditionally. Your PSIVar 
instance should always have a 'other' attribute, its value can be None 
though.



JM


From bahamutzero8825 at gmail.com  Fri Sep 23 09:57:32 2011
From: bahamutzero8825 at gmail.com (Andrew Berg)
Date: Fri, 23 Sep 2011 08:57:32 -0500
Subject: Odd behavior with imp.reload and logging
In-Reply-To: <CAPTjJmrzvFwqD_w5BxaQycSzsFSwVFiPzFKEAdhF=1_scw7ReQ@mail.gmail.com>
References: <mailman.1338.1316656397.27778.python-list@python.org>
	<4e7ab80f$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<4E7ABDFB.5020509@gmail.com>
	<CAPTjJmprFB1R3XhMfZt_7oC13RmMmJB_M47YBsyr1w6SP671CQ@mail.gmail.com>
	<4E7ACD82.4080302@gmail.com>
	<CAPTjJmqWGT__dtWH55RgMoC0TYP8NRtnr8zUjz-L1KG4TVQBKQ@mail.gmail.com>
	<4E7AEAEE.20504@gmail.com>
	<CAPTjJmrzvFwqD_w5BxaQycSzsFSwVFiPzFKEAdhF=1_scw7ReQ@mail.gmail.com>
Message-ID: <4E7C904C.3020604@gmail.com>

On 2011.09.22 03:12 AM, Chris Angelico wrote:
> In theory, this should mean that you load it fresh every time - I
> think. If not, manually deleting entries from sys.modules might help,
> either with or without the list of modules.
I've played around with sys.modules, and it seems there are issues with
logging being reloaded (not sure if it's fair to call it a bug), not my
module. The only reliable way I've found to start fresh is to delete at
least logging from sys.modules (I can even do this from within my
module). Even if the module that imports logging is deleted, things in
logging persist (I can confirm at least handlers and handles to log
files; the latter requiring garbage collection as well to free up).
However, this would probably wreak havoc on other code that uses logging
(although, I could always import logging as something else).

On a side note, this actually gives me a good way to detect that the
module is reloaded (I can't think of any other way to detect it, at
least not off the top of my head).
-- 
CPython 3.2.2 | Windows NT 6.1.7601.17640 | Thunderbird 6.0.2


From andrea.crotti.0 at gmail.com  Fri Sep 23 09:59:56 2011
From: andrea.crotti.0 at gmail.com (Andrea Crotti)
Date: Fri, 23 Sep 2011 14:59:56 +0100
Subject: extending class
In-Reply-To: <4E7C8701.5020302@sequans.com> (Jean-Michel Pichavant's message
	of "Fri, 23 Sep 2011 15:17:53 +0200")
References: <4E7C4D6A.8050107@gmail.com> <j5hjlj$him$1@dough.gmane.org>
	<4E7C52F5.5060301@gmail.com> <4E7C8701.5020302@sequans.com>
Message-ID: <87pqirnyub.fsf@gmail.com>

Jean-Michel Pichavant <jeanmichel at sequans.com> writes:

> Did you consider subclassing your Var class ? This is how you extend a
> class behavior in OOP.
>
> class PSIVar(var):
>    def __init__(self, name, desc, other=None, fun=None):
>        var.__init__(self, name, desc)
>        if other is not None:
>            self.other = other
>            self.fun = fun
>            assert callable(self.fun)
>
> v1 = PSIVar('name', 'desc')
>
> that's it.
>
> By the way, don't create instance attribute conditionally. Your PSIVar
> instance should always have a 'other' attribute, its value can be None
> though.
>
>
>
> JM


Yes thanks, first I tried that, but I didn't want to have to change my
class definition if the one from the library changes.  So I started to
mess with *args and **kwargs and it was really not beautiful ;)

Anyway since I want to other and more deep changes I just forked the
project and start work on that...


From gmszone at gmail.com  Fri Sep 23 10:01:27 2011
From: gmszone at gmail.com (gmszone)
Date: Fri, 23 Sep 2011 07:01:27 -0700 (PDT)
Subject: Could anybody tell me how to make a version of Nokia Symbian os
Message-ID: <9e03e15b-4d1e-4af7-8e80-751ab9e2f35f@f12g2000yqi.googlegroups.com>

I like the Python in my mobile phone.But a don't have the enough money
to buy a new phone.And my mobile type is Nokia N72 which is a part of
S60v2.And I could program in some boring classes.But the version of my
mobile's python is to old.So I hope I coule learn how to  compile it
for my N72.My notebook has the Windows 7 and Ubuntu GNU/Linux.Ask for
help.....


From steve+comp.lang.python at pearwood.info  Fri Sep 23 10:21:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 00:21:53 +1000
Subject: extending class
References: <mailman.1384.1316769390.27778.python-list@python.org>
Message-ID: <4e7c9602$0$30000$c3e8da3$5496439d@news.astraweb.com>

Andrea Crotti wrote:

> I wanted to add a couple of parameters to a class from a given library
> (paste-script), but without changing the original code.
> So I thought, I create a wrapper class which adds what I need, and then
> dispatch all the calls to the super class.

You don't need to use a wrapper class if all you want is to add additional
attributes to an instance.

>>> class Spam(object):
...     def __init__(self):
...             self.x = 1
...
>>> s = Spam()
>>> s.name = "Fred"
>>> s.name
'Fred'


> My following attempt gives, however, a recursion error, but why?

Here is an old recipe showing how to do automatic delegation correctly:

http://code.activestate.com/recipes/52295/



-- 
Steven



From w.g.sneddon at gmail.com  Fri Sep 23 10:25:55 2011
From: w.g.sneddon at gmail.com (python)
Date: Fri, 23 Sep 2011 07:25:55 -0700 (PDT)
Subject: pyWin build 216
Message-ID: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>

I have used pyWin for several years now with out issue.   I recently
installed build 216 for python 2.7 on windows XP pro.   The program
crashes every time I exit a wxPython program and has crashed a few
other times.  I does not seem that pyWin has been updated since
February of this year.   Is there a direction change for the windows
extensions?  Is it time I make the move to 3.x?  Mark Hammond has
given much to the Python community and I do not intend for this post
to be negative in any way.


From atherun at gmail.com  Fri Sep 23 10:58:07 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 07:58:07 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<mailman.1381.1316761723.27778.python-list@python.org>
Message-ID: <5bd0c088-0f46-4e4a-b5c5-9d8de668b50d@v18g2000yqj.googlegroups.com>

On Sep 23, 12:08?am, Chris Angelico <ros... at gmail.com> wrote:
> On Fri, Sep 23, 2011 at 3:59 PM, Nobody <nob... at nowhere.com> wrote:
> > It doesn't even
>
> You intrigue me, sir. Does it odd?
>
> What is the remainder of this aborted sentence?
>
> ChrisA

That is odd, I also find it odd that it deadlocks the entire python
system, even threads that have nothing to do with the subprocess stop
working, the entire thing just stops. I may not have pasted the full
stack trace looking at it again, I'll double check in a few.

I was able to repro this on a tool I have the source for, when I
attach to it to debug visual studio tells me the threads are
deadlocked and the only stack trace I have available to me is a low
level os call to a WriteFile function.


From brian.curtin at gmail.com  Fri Sep 23 11:01:04 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Fri, 23 Sep 2011 10:01:04 -0500
Subject: pyWin build 216
In-Reply-To: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
References: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
Message-ID: <CAD+XWwo33mPinnk5ZBMKYHCAYsexTpLxOt+JZT=qNPnHqJ=Uhg@mail.gmail.com>

On Fri, Sep 23, 2011 at 09:25, python <w.g.sneddon at gmail.com> wrote:
> I have used pyWin for several years now with out issue. ? I recently
> installed build 216 for python 2.7 on windows XP pro. ? The program
> crashes every time I exit a wxPython program and has crashed a few
> other times. ?I does not seem that pyWin has been updated since
> February of this year. ? Is there a direction change for the windows
> extensions? ?Is it time I make the move to 3.x? ?Mark Hammond has
> given much to the Python community and I do not intend for this post
> to be negative in any way.

pywin32 has been available for 3.x for some time, but you wouldn't be
able to use it since you're currently using wxPython.

You may want to post a more detailed question to
http://mail.python.org/mailman/listinfo/python-win32 -- Mark hangs out
there and there are plenty of pywin32 experts around who could help as
well.


From jesus.ramirez.utexas at gmail.com  Fri Sep 23 11:41:59 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Fri, 23 Sep 2011 08:41:59 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>

Python 2.5.6 (r256:88840, Sep 22 2011, 13:45:58)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import zlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named zlib
>>>

But if I run Python2.7 I get:

Python 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import zlib
>>>

It seems to work.



From chris at simplistix.co.uk  Fri Sep 23 13:06:19 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Fri, 23 Sep 2011 18:06:19 +0100
Subject: python install on locked down windows box?
In-Reply-To: <4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1357.1316683648.27778.python-list@python.org>
	<4e7b30da$0$29976$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E7CBC8B.8000501@simplistix.co.uk>

Hi Steve

On 22/09/2011 13:58, Steven D'Aprano wrote:
> (7) If all else fails, as an absolute last resort, simply run the Windows
> installer as a regular, unprivileged user, after selecting the option for a
> Non-Admin Install under Advanced Options first.

Thanks for this, will send on to my friend in need...
Hadn't seen this before, but it's a long time since I've run the Windows 
installer ;-)

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From atherun at gmail.com  Fri Sep 23 13:07:56 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 10:07:56 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<mailman.1381.1316761723.27778.python-list@python.org>
	<5bd0c088-0f46-4e4a-b5c5-9d8de668b50d@v18g2000yqj.googlegroups.com>
Message-ID: <7133358a-3fd0-4dfd-8af7-d8afaa9c6597@z7g2000vbp.googlegroups.com>

On Sep 23, 7:58?am, Atherun <athe... at gmail.com> wrote:
> On Sep 23, 12:08?am, Chris Angelico <ros... at gmail.com> wrote:
>
> > On Fri, Sep 23, 2011 at 3:59 PM, Nobody <nob... at nowhere.com> wrote:
> > > It doesn't even
>
> > You intrigue me, sir. Does it odd?
>
> > What is the remainder of this aborted sentence?
>
> > ChrisA
>
> That is odd, I also find it odd that it deadlocks the entire python
> system, even threads that have nothing to do with the subprocess stop
> working, the entire thing just stops. I may not have pasted the full
> stack trace looking at it again, I'll double check in a few.
>
> I was able to repro this on a tool I have the source for, when I
> attach to it to debug visual studio tells me the threads are
> deadlocked and the only stack trace I have available to me is a low
> level os call to a WriteFile function.

Ya heres the full python stack:


ntoskrnl.exe!memset+0x64a
ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!__misaligned_access+0xba4
ntoskrnl.exe!__misaligned_access+0x1821
ntoskrnl.exe!KeWaitForMultipleObjects+0xf5d
ntoskrnl.exe!KeWaitForMutexObject+0x19f
ntoskrnl.exe!NtWaitForSingleObject+0xde
ntoskrnl.exe!KeSynchronizeExecution+0x3a43
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x6c0
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x4a8
wow64.dll!Wow64SystemServiceEx+0x1ce
wow64.dll!Wow64LdrpInitialize+0x429
ntdll.dll!RtlUniform+0x6e6
ntdll.dll!RtlCreateTagHeap+0xa7
ntdll.dll!LdrInitializeThunk+0xe
ntdll.dll!ZwWaitForSingleObject+0x15
kernel32.dll!WaitForSingleObjectEx+0x43
kernel32.dll!WaitForSingleObject+0x12
python26.dll!_Py_svnversion+0xcf8
python26.dll!PyObject_AsReadBuffer+0x46d
python26.dll!PyEval_EvalCodeEx+0x738
python26.dll!PyEval_EvalFrameEx+0x467
python26.dll!PyObject_Realloc+0x90
python26.dll!PyEval_EvalCodeEx+0x8ef
python26.dll!PyEval_EvalFrameEx+0x467


From msoulier at digitaltorque.ca  Fri Sep 23 13:15:25 2011
From: msoulier at digitaltorque.ca (Michael P. Soulier)
Date: Fri, 23 Sep 2011 13:15:25 -0400
Subject: ANN: Urwid 1.0.0 - Console UI Library
In-Reply-To: <4E7B4E9C.7060704@excess.org>
References: <4E7B4E9C.7060704@excess.org>
Message-ID: <20110923171525.GH2703@digitaltorque.ca>

On 22/09/11 Ian Ward said:

> Announcing Urwid 1.0.0
> ----------------------

Congrats. 


From nobody at nowhere.com  Fri Sep 23 13:47:20 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 23 Sep 2011 18:47:20 +0100
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
Message-ID: <pan.2011.09.23.17.47.20.100000@nowhere.com>

On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:

>> kernel32.dll!WaitForSingleObject+0x12
>> python26.dll!_Py_svnversion+0xcf8
> 
> I haven't a clue how this happens. _Py_svnversion just returns a string:

In retrospect, I think that's a red herring. 0xcf8 seems like too large an
offset for such a small function. I think that it's more likely to be in a
non-exported function, and _Py_svnversion just happens to be the last
exported symbol prior to that point in the code.



From atherun at gmail.com  Fri Sep 23 13:59:27 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 10:59:27 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<pan.2011.09.23.17.47.20.100000@nowhere.com>
Message-ID: <2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>

On Sep 23, 10:47?am, Nobody <nob... at nowhere.com> wrote:
> On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:
> >> kernel32.dll!WaitForSingleObject+0x12
> >> python26.dll!_Py_svnversion+0xcf8
>
> > I haven't a clue how this happens. _Py_svnversion just returns a string:
>
> In retrospect, I think that's a red herring. 0xcf8 seems like too large an
> offset for such a small function. I think that it's more likely to be in a
> non-exported function, and _Py_svnversion just happens to be the last
> exported symbol prior to that point in the code.

I have the call stacks for each python thread running up until the
dead lock:

# ThreadID: 992
  out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()

# ThreadID: 5516
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

# ThreadID: 2668
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 69, in
run
  self.stacktraces()
File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 86, in
stacktraces
  fout.write(stacktraces())
File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 26, in
stacktraces
  for filename, lineno, name, line in traceback.extract_stack(stack):

# ThreadID: 3248
  out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()


# ThreadID: 7700
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

# ThreadID: 8020
  out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()

# ThreadID: 4252
File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

The StackTracer thread freezes trying to update my output file, and
yes I'm trying to 3 tasks in parallel which each one starts by
creating a changelist in perforce.  This is just an easy repro case
for me, it happens with commands other then p4.  This almost looks
like a threading issue more then the output deadlock.


From luch at ank-sia.com  Fri Sep 23 14:21:56 2011
From: luch at ank-sia.com (Alexey Luchko)
Date: Fri, 23 Sep 2011 21:21:56 +0300
Subject: comments on runpy module
Message-ID: <4E7CCE44.8030508@ank-sia.com>

Hi!

I've just had fun with the runpy module in Python 2.7.  I'm writing to 
share it :)

What I've tried is to "load" a python script using runpy.run_path(), take a 
function from the resulting namespace and call it with arbitrary arguments.

All the functions in the namespace seem to be ok.  repr(namespace["f"]) 
gives "<function f at 0x005531F0>".

But if the f() is referring the modules namespace (I supposed it is the 
same as the returned one), all the values appear to be None.

Example script.py: """
def f(arg):
    return g(arg)

def g(arg):
    return arg
"""

Then running main.py: """
import runpy

namespace = runpy.run_path("./script.py")
print namespace["f"]
print namespace["g"]

print namespace["f"]("abc")
"""

gives such an output """
<function f at 0x005524F0>
<function g at 0x023F0830>
Traceback (most recent call last):
   File "main.py", line 7, in <module>
     print namespace["f"]("abc")
   File "./script.py", line 2, in f
     return g(arg)
TypeError: 'NoneType' object is not callable
"""

Reading the Lib/runpy.py I've found, that the temporary module created 
inside the run_path() calls, is destroyed right after the script.py code 
executed in the resulting namespace.

I suppose that it is ether an issue or a feature that should be documented :)

--
Have a good time and a good mood!

Alex.


From luch at ank-sia.com  Fri Sep 23 14:38:36 2011
From: luch at ank-sia.com (Alexey Luchko)
Date: Fri, 23 Sep 2011 21:38:36 +0300
Subject: comments on runpy module
In-Reply-To: <4E7CCE44.8030508@ank-sia.com>
References: <4E7CCE44.8030508@ank-sia.com>
Message-ID: <4E7CD22C.5040308@ank-sia.com>

> Example script.py: """
> def f(arg):
>     return g(arg)
>
> def g(arg):
>     return arg
> """

> Reading the Lib/runpy.py I've found, that the temporary module created
> inside the run_path() calls, is destroyed right after the script.py code
> executed in the resulting namespace.

I've got an idea.  It would be nice if there existed such a way to use it:
with runpy.run_path("script.py") as a_namespace:
   a_namespace["f"]("abc")

--
Regards,
Alex.


From Phillip.M.Feldman at gmail.com  Fri Sep 23 16:09:32 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Fri, 23 Sep 2011 13:09:32 -0700 (PDT)
Subject: strange behavior from recursive generator
Message-ID: <32503886.post@talk.nabble.com>


A few weeks ago, I wrote a class that creates an iterator for solving the
general unlabeled-balls-in-labeled boxes occupancy problem. Chris Rebert
converted my code to a generator, which made the code cleaner, and I
subsequently simplified it somewhat further.

My problem is the following: All of these versions of the code work fine for
very small problems, but do not produce the full set of occupancy
distributions for larger problems. The following sample input and output
show what happens with two balls and two boxes (to keep things simple, I've
made the boxes large enough so that each box can hold both balls).

In [6]: x= balls_in_labeled_boxes(2,[2,2])

In [7]: list(x)
balls=2, box_sizes=[2, 2]
About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2]
i=0, distribution_other=(0,)
About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2]
i=0, distribution_other=(1,)
About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2]
i=0, distribution_other=(2,)
Out[7]: [(2, 0), (1, 1), (0, 2)]

Note that Out[7] above gives the correct result, showing all three possible
distributions. Now lets try the same thing with three boxes.

In [8]: x= balls_in_labeled_boxes(2,[2,2,2])

In [9]: list(x)
balls=2, box_sizes=[2, 2, 2]
About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2, 2]
i=0, distribution_other=(0, 0)
About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2, 2]
i=0, distribution_other=(1, 0)
About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2, 2]
i=0, distribution_other=(2, 0)
i=1, distribution_other=(1, 1)
Out[9]: [(2, 0, 0), (1, 1, 0), (0, 2, 0), (0, 1, 1)]

When there are no balls in the initial box, the recursive call should
produce the same three occupancy distributions that we saw above, but one of
them is now missing. If someone can shed light on why this is happening, I'd
be grateful.

Phillip

http://old.nabble.com/file/p32503886/balls_in_labeled_boxes.py
balls_in_labeled_boxes.py 
-- 
View this message in context: http://old.nabble.com/strange-behavior-from-recursive-generator-tp32503886p32503886.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From arnodel at gmail.com  Fri Sep 23 16:26:13 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Fri, 23 Sep 2011 21:26:13 +0100
Subject: strange behavior from recursive generator
In-Reply-To: <32503886.post@talk.nabble.com>
References: <32503886.post@talk.nabble.com>
Message-ID: <CAJ6cK1bxBtshYVbU3C5+KdQ+chDyEeDtPDSa6bEyx6ZcxT1FCw@mail.gmail.com>

On 23 September 2011 21:09, Dr. Phillip M. Feldman
<Phillip.M.Feldman at gmail.com> wrote:
>
> A few weeks ago, I wrote a class that creates an iterator for solving the
> general unlabeled-balls-in-labeled boxes occupancy problem. Chris Rebert
> converted my code to a generator, which made the code cleaner, and I
> subsequently simplified it somewhat further.
>
> My problem is the following: All of these versions of the code work fine for
> very small problems, but do not produce the full set of occupancy
> distributions for larger problems. The following sample input and output
> show what happens with two balls and two boxes (to keep things simple, I've
> made the boxes large enough so that each box can hold both balls).
>
> In [6]: x= balls_in_labeled_boxes(2,[2,2])
>
> In [7]: list(x)
> balls=2, box_sizes=[2, 2]
> About to make recursive call. ?balls_in_other_boxes=0, box_sizes=[2]
> i=0, distribution_other=(0,)
> About to make recursive call. ?balls_in_other_boxes=1, box_sizes=[2]
> i=0, distribution_other=(1,)
> About to make recursive call. ?balls_in_other_boxes=2, box_sizes=[2]
> i=0, distribution_other=(2,)
> Out[7]: [(2, 0), (1, 1), (0, 2)]
>
> Note that Out[7] above gives the correct result, showing all three possible
> distributions. Now lets try the same thing with three boxes.
>
> In [8]: x= balls_in_labeled_boxes(2,[2,2,2])
>
> In [9]: list(x)
> balls=2, box_sizes=[2, 2, 2]
> About to make recursive call. ?balls_in_other_boxes=0, box_sizes=[2, 2]
> i=0, distribution_other=(0, 0)
> About to make recursive call. ?balls_in_other_boxes=1, box_sizes=[2, 2]
> i=0, distribution_other=(1, 0)
> About to make recursive call. ?balls_in_other_boxes=2, box_sizes=[2, 2]
> i=0, distribution_other=(2, 0)
> i=1, distribution_other=(1, 1)
> Out[9]: [(2, 0, 0), (1, 1, 0), (0, 2, 0), (0, 1, 1)]
>
> When there are no balls in the initial box, the recursive call should
> produce the same three occupancy distributions that we saw above, but one of
> them is now missing. If someone can shed light on why this is happening, I'd
> be grateful.

Line 46:

         for distribution_other in _balls_in_unlabeled_boxes(

Should be:


         for distribution_other in _balls_in_labeled_boxes(

HTH

-- 
Arnaud


From lists at cheimes.de  Fri Sep 23 17:20:44 2011
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 23 Sep 2011 23:20:44 +0200
Subject: Python 2.5 zlib trouble
In-Reply-To: <308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
Message-ID: <j5it7d$mfj$1@dough.gmane.org>

Am 23.09.2011 17:41, schrieb Jesramz:
> Python 2.5.6 (r256:88840, Sep 22 2011, 13:45:58)
> [GCC 4.5.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import zlib
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named zlib

Are you running a self-compiled installation of Python 2.5 on recent
Debian or Ubuntu? Check out my blog
http://lipyrary.blogspot.com/2011/05/how-to-compile-python-on-ubuntu-1104.html

Christian



From jesus.ramirez.utexas at gmail.com  Fri Sep 23 17:34:16 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Fri, 23 Sep 2011 14:34:16 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
Message-ID: <78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>


Thank You Christian

Im running on Ubuntu Natty and I am not running a self-compiled
install, its a regular release. In order to do this:

  $ make distclean
   $ export LDFLAGS="-L/usr/lib/$(dpkg-architecture -
qDEB_HOST_MULTIARCH)"
   $ ./configure
   $ make
   $ make install
   $ unset LDFLAGS

If you can, can you explain the steps for this, can I run this in a
regular release of Python2.5?


From phillip.m.feldman at gmail.com  Fri Sep 23 19:42:13 2011
From: phillip.m.feldman at gmail.com (Phillip Feldman)
Date: Fri, 23 Sep 2011 16:42:13 -0700
Subject: strange behavior from recursive generator
In-Reply-To: <CAJ6cK1bxBtshYVbU3C5+KdQ+chDyEeDtPDSa6bEyx6ZcxT1FCw@mail.gmail.com>
References: <32503886.post@talk.nabble.com>
	<CAJ6cK1bxBtshYVbU3C5+KdQ+chDyEeDtPDSa6bEyx6ZcxT1FCw@mail.gmail.com>
Message-ID: <CAB2ViTbM0+2ffKs4tqCTsn0WMtKPCTFpnrvs6RvUeCV-PLAAKw@mail.gmail.com>

I don't know how many times I stared at that code without seeing the error.

Thanks so much!

Phillip

On Fri, Sep 23, 2011 at 1:26 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:

> On 23 September 2011 21:09, Dr. Phillip M. Feldman
> <Phillip.M.Feldman at gmail.com> wrote:
> >
> > A few weeks ago, I wrote a class that creates an iterator for solving the
> > general unlabeled-balls-in-labeled boxes occupancy problem. Chris Rebert
> > converted my code to a generator, which made the code cleaner, and I
> > subsequently simplified it somewhat further.
> >
> > My problem is the following: All of these versions of the code work fine
> for
> > very small problems, but do not produce the full set of occupancy
> > distributions for larger problems. The following sample input and output
> > show what happens with two balls and two boxes (to keep things simple,
> I've
> > made the boxes large enough so that each box can hold both balls).
> >
> > In [6]: x= balls_in_labeled_boxes(2,[2,2])
> >
> > In [7]: list(x)
> > balls=2, box_sizes=[2, 2]
> > About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2]
> > i=0, distribution_other=(0,)
> > About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2]
> > i=0, distribution_other=(1,)
> > About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2]
> > i=0, distribution_other=(2,)
> > Out[7]: [(2, 0), (1, 1), (0, 2)]
> >
> > Note that Out[7] above gives the correct result, showing all three
> possible
> > distributions. Now lets try the same thing with three boxes.
> >
> > In [8]: x= balls_in_labeled_boxes(2,[2,2,2])
> >
> > In [9]: list(x)
> > balls=2, box_sizes=[2, 2, 2]
> > About to make recursive call.  balls_in_other_boxes=0, box_sizes=[2, 2]
> > i=0, distribution_other=(0, 0)
> > About to make recursive call.  balls_in_other_boxes=1, box_sizes=[2, 2]
> > i=0, distribution_other=(1, 0)
> > About to make recursive call.  balls_in_other_boxes=2, box_sizes=[2, 2]
> > i=0, distribution_other=(2, 0)
> > i=1, distribution_other=(1, 1)
> > Out[9]: [(2, 0, 0), (1, 1, 0), (0, 2, 0), (0, 1, 1)]
> >
> > When there are no balls in the initial box, the recursive call should
> > produce the same three occupancy distributions that we saw above, but one
> of
> > them is now missing. If someone can shed light on why this is happening,
> I'd
> > be grateful.
>
> Line 46:
>
>         for distribution_other in _balls_in_unlabeled_boxes(
>
> Should be:
>
>
>         for distribution_other in _balls_in_labeled_boxes(
>
> HTH
>
> --
> Arnaud
>
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From greg.ewing at canterbury.ac.nz  Fri Sep 23 20:07:54 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 24 Sep 2011 12:07:54 +1200
Subject: Context manager with class methods
In-Reply-To: <mailman.1376.1316732239.27778.python-list@python.org>
References: <33427117.1421.1316686888275.JavaMail.geo-discussion-forums@yqog21>
	<mailman.1376.1316732239.27778.python-list@python.org>
Message-ID: <9e4lasFv7sU1@mid.individual.net>

Terry Reedy wrote:

> it is normal to look for special methods on the class (and superclasses)
 > of an object rather than starting with the object itself.

> I suspect there was a deliberate change to correct an anomaly, though 
> this might have been done as part of some other change.

It's a necessary consequence of the fact that new-style classes
are also instances. Without it, there would be an ambiguity as
to whether a special method defined the behaviour of instances
of a class or of the class object itself.

It also increases efficiency, because for those special methods
that correspond to C-level type slots, you only have to look
in the type slot to find an implementation of the method,
rather than having to look in the instance dict first.

-- 
Greg


From alec.taylor6 at gmail.com  Fri Sep 23 20:53:06 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 24 Sep 2011 10:53:06 +1000
Subject: Python 2.5 zlib trouble
In-Reply-To: <CAJXGoRkrYxNgsXiffADcUPGtm91e+dt1c2KCNayYesNoymDZ9A@mail.gmail.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<CAO+9iGeNc+r1-KhXfKyOxZhY8t-zKPSo3v0aTQcx2oTepo_n2Q@mail.gmail.com>
	<CAJXGoRkrYxNgsXiffADcUPGtm91e+dt1c2KCNayYesNoymDZ9A@mail.gmail.com>
Message-ID: <CAO+9iGdUwEooODHydD8HkG+3fzSrBjw0K8tZsdNVFzxSjP5kbA@mail.gmail.com>

No idea, as I said before, if you ask for it they might put in the alpha.

On Sat, Sep 24, 2011 at 8:30 AM, Jesse Ramirez
<jesus.ramirez.utexas at gmail.com> wrote:
>
> Thanks Alec, might you know when the 2.7 support might come?


From jesus.ramirez.utexas at gmail.com  Fri Sep 23 21:19:39 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Fri, 23 Sep 2011 18:19:39 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<CAO+9iGeNc+r1-KhXfKyOxZhY8t-zKPSo3v0aTQcx2oTepo_n2Q@mail.gmail.com>
	<CAJXGoRkrYxNgsXiffADcUPGtm91e+dt1c2KCNayYesNoymDZ9A@mail.gmail.com>
	<mailman.1407.1316825588.27778.python-list@python.org>
Message-ID: <5f064e18-57ab-4a7a-b855-e212bb84711d@l4g2000vbz.googlegroups.com>

Thank You Christian

Im running on Ubuntu Natty and I am not running a self-compiled
install, its a regular release. In order to do this:
  $ make distclean
   $ export LDFLAGS="-L/usr/lib/$(dpkg-architecture -
qDEB_HOST_MULTIARCH)"
   $ ./configure
   $ make
   $ make install
   $ unset LDFLAGS

If you can, can you explain the steps for this, can I run this in a
regular release of Python2.5?





From ricky85.phone at gmail.com  Fri Sep 23 21:42:44 2011
From: ricky85.phone at gmail.com (Ricardo)
Date: Fri, 23 Sep 2011 20:42:44 -0500
Subject: can't load an script from html...
Message-ID: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>

Hi everyone
I'm trying to use the cgi library to create a python script and loading it from a web page. I have already done the necessary imports, and the default commands to receive data from "html" are written too. The final version is something like this:

#!/usr/bin/python

import subprocess
import cgi
import cgitb

cgitb.enable()

input = cgi.FieldStorage()

?. my code (do something with input)?.


#printing the response

	print "Content-Type: text/html"    
	print                               
	print "<TITLE>My title:</TITLE>"
	print "</HEAD>"
	print "<BODY>"
	print ?.. bla bla ?
	print "%s"%theoutput
	print "</BODY>"

Besides, my call from my index.html is like this:

 <form action="/scripts/python_script.py" method="post">
      	<input name="inid" type="text" size="20" class="input" /><br/><br/>
        <input type="submit" value="accept"  class="button"/>
 </form>

well, the thing is that when i do the call from the browser: 

http://localhost/index.html 
           |
          V
put the data and click on the "accept" button
           |
          V
http:/localhost/scripts/python_script.py

I only get the python_script.py as a plain test by response (the script printed on my browser). 
I have already changed the permissions for python_script.py. I have checked the import cgi,cgitb in the python shell (i am using v2.7) and they work fine. So, i don't know what it is going wrong here.

A little help please? any idea?
Thanks anyway for your time.




From python at mrabarnett.plus.com  Fri Sep 23 21:57:37 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 24 Sep 2011 02:57:37 +0100
Subject: can't load an script from html...
In-Reply-To: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>
References: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>
Message-ID: <4E7D3911.9030803@mrabarnett.plus.com>

On 24/09/2011 02:42, Ricardo wrote:
> Hi everyone
> I'm trying to use the cgi library to create a python script and loading it from a web page. I have already done the necessary imports, and the default commands to receive data from "html" are written too. The final version is something like this:
>
> #!/usr/bin/python
>
> import subprocess
> import cgi
> import cgitb
>
> cgitb.enable()
>
> input = cgi.FieldStorage()
>
> ?. my code (do something with input)?.
>
>
> #printing the response
>
> 	print "Content-Type: text/html"
> 	print
> 	print "<TITLE>My title:</TITLE>"
> 	print "</HEAD>"
> 	print "<BODY>"
> 	print ?.. bla bla ?
> 	print "%s"%theoutput
> 	print "</BODY>"
>
> Besides, my call from my index.html is like this:
>
>   <form action="/scripts/python_script.py" method="post">
>        	<input name="inid" type="text" size="20" class="input" /><br/><br/>
>          <input type="submit" value="accept"  class="button"/>
>   </form>
>
> well, the thing is that when i do the call from the browser:
>
> http://localhost/index.html
>             |
>            V
> put the data and click on the "accept" button
>             |
>            V
> http:/localhost/scripts/python_script.py
>
> I only get the python_script.py as a plain test by response (the script printed on my browser).
> I have already changed the permissions for python_script.py. I have checked the import cgi,cgitb in the python shell (i am using v2.7) and they work fine. So, i don't know what it is going wrong here.
>
> A little help please? any idea?
> Thanks anyway for your time.
>
If it helps, the responses on my home-make stuff start something like this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
</HEAD>


From anacrolix at gmail.com  Fri Sep 23 22:03:01 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Sat, 24 Sep 2011 12:03:01 +1000
Subject: Python deadlock using subprocess.popen and communicate
In-Reply-To: <2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<pan.2011.09.23.17.47.20.100000@nowhere.com>
	<2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>
Message-ID: <CAB4yi1NDdQsSM3UHaO1T0uZfe_hBC+xPW7ir7ggSZL3KcaS-VQ@mail.gmail.com>

how do you get the call stacks like this?

On Sat, Sep 24, 2011 at 3:59 AM, Atherun <atherun at gmail.com> wrote:
> On Sep 23, 10:47?am, Nobody <nob... at nowhere.com> wrote:
>> On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:
>> >> kernel32.dll!WaitForSingleObject+0x12
>> >> python26.dll!_Py_svnversion+0xcf8
>>
>> > I haven't a clue how this happens. _Py_svnversion just returns a string:
>>
>> In retrospect, I think that's a red herring. 0xcf8 seems like too large an
>> offset for such a small function. I think that it's more likely to be in a
>> non-exported function, and _Py_svnversion just happens to be the last
>> exported symbol prior to that point in the code.
>
> I have the call stacks for each python thread running up until the
> dead lock:
>
> # ThreadID: 992
> ?out, err = proc.communicate("change: new\ndescription: %s
> \n"%changelistDesc)
> File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> communicate
> ?return self._communicate(input)
> File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> _communicate
> ?stdout_thread.join()
> File: "c:\src\extern\python\lib\threading.py", line 637, in join
> ?self.__block.wait()
> File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> ?waiter.acquire()
>
> # ThreadID: 5516
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\extern\python\lib\threading.py", line 477, in run
> ?self.__target(*self.__args, **self.__kwargs)
> File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> _readerthread
> ?buffer.append(fh.read())
>
> # ThreadID: 2668
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 69, in
> run
> ?self.stacktraces()
> File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 86, in
> stacktraces
> ?fout.write(stacktraces())
> File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 26, in
> stacktraces
> ?for filename, lineno, name, line in traceback.extract_stack(stack):
>
> # ThreadID: 3248
> ?out, err = proc.communicate("change: new\ndescription: %s
> \n"%changelistDesc)
> File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> communicate
> ?return self._communicate(input)
> File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> _communicate
> ?stdout_thread.join()
> File: "c:\src\extern\python\lib\threading.py", line 637, in join
> ?self.__block.wait()
> File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> ?waiter.acquire()
>
>
> # ThreadID: 7700
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\extern\python\lib\threading.py", line 477, in run
> ?self.__target(*self.__args, **self.__kwargs)
> File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> _readerthread
> ?buffer.append(fh.read())
>
> # ThreadID: 8020
> ?out, err = proc.communicate("change: new\ndescription: %s
> \n"%changelistDesc)
> File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> communicate
> ?return self._communicate(input)
> File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> _communicate
> ?stdout_thread.join()
> File: "c:\src\extern\python\lib\threading.py", line 637, in join
> ?self.__block.wait()
> File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> ?waiter.acquire()
>
> # ThreadID: 4252
> File: "c:\src\extern\python\lib\threading.py", line 497, in
> __bootstrap
> ?self.__bootstrap_inner()
> File: "c:\src\extern\python\lib\threading.py", line 525, in
> __bootstrap_inner
> ?self.run()
> File: "c:\src\extern\python\lib\threading.py", line 477, in run
> ?self.__target(*self.__args, **self.__kwargs)
> File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> _readerthread
> ?buffer.append(fh.read())
>
> The StackTracer thread freezes trying to update my output file, and
> yes I'm trying to 3 tasks in parallel which each one starts by
> creating a changelist in perforce. ?This is just an easy repro case
> for me, it happens with commands other then p4. ?This almost looks
> like a threading issue more then the output deadlock.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From flt.johnson at gmail.com  Fri Sep 23 23:36:05 2011
From: flt.johnson at gmail.com (Fletcher Johnson)
Date: Fri, 23 Sep 2011 20:36:05 -0700 (PDT)
Subject: Why is the shutil module called shutil?
Message-ID: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>

The topic says it all:
Why is shutil named shutil? What does it stand for? This is just a
mild curiosity of mine.
The shutil module for reference: http://docs.python.org/library/shutil.html#module-shutil


From skippy.hammond at gmail.com  Fri Sep 23 23:43:45 2011
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Sat, 24 Sep 2011 13:43:45 +1000
Subject: pyWin build 216
In-Reply-To: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
References: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
Message-ID: <4E7D51F1.7010209@gmail.com>

On 24/09/2011 12:25 AM, python wrote:
> I have used pyWin for several years now with out issue.   I recently
> installed build 216 for python 2.7 on windows XP pro.   The program
> crashes every time I exit a wxPython program and has crashed a few
> other times.

There are a number of issues using Pythonwin to run a program which uses 
a different UI toolkit (eg, wx, Tkinter) and while these have been 
around for many years I don't plan on trying to fix it.  IOW, "don't do 
that" :)

> I does not seem that pyWin has been updated since
> February of this year.   Is there a direction change for the windows
> extensions?  Is it time I make the move to 3.x?  Mark Hammond has
> given much to the Python community and I do not intend for this post
> to be negative in any way.

No problem.  There have been no updates as there is very little to 
update (ie, the code hasn't change a huge amount in hg since then). 
There will probably be a new version in the next month or so, but that 
is quite orthogonal to whether you should move to 3.x - the 3.x version 
of Pythonwin hasn't been updated in the same period and is built from 
the same source tree, so is likely to have exactly the same problems 
(infact is likely to have a few more - there are probably a few 3.x 
specific issues still hiding away).

Mark


From clp2 at rebertia.com  Fri Sep 23 23:58:41 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 23 Sep 2011 20:58:41 -0700
Subject: Why is the shutil module called shutil?
In-Reply-To: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
Message-ID: <CAMZYqRTbnr7n3H4iuxzpaQdDynuPnGrMh0K_FKnXF_DZNN26wQ@mail.gmail.com>

On Fri, Sep 23, 2011 at 8:36 PM, Fletcher Johnson <flt.johnson at gmail.com> wrote:
> The topic says it all:
> Why is shutil named shutil? What does it stand for? This is just a
> mild curiosity of mine.

"sh" is short for "shell", in line with Unix convention, where the
default shell is located at /bin/sh.
http://en.wikipedia.org/wiki/Shell_(computing)
http://en.wikipedia.org/wiki/Unix_shell

"util" is short for "utilities".

shutil is a utility module used to accomplish tasks which one often
does when in the shell, such as copying, moving, or removing directory
trees. But shutil (to my knowledge) is not implemented using shell
commands or by running external programs, so it thus avoids a whole
host of shell-related issues.

It's not the best name, but what with backwards compatibility and all,
it's unlikely to change any time soon.

Cheers,
Chris
--
http://rebertia.com


From 1248283536 at qq.com  Sat Sep 24 00:11:17 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Sat, 24 Sep 2011 12:11:17 +0800
Subject: parse  html:strange  tr  problem
Message-ID: <tencent_111E99F82BF933053E9E16DB@qq.com>

here is my code:
import lxml.html
sfile='http://finance.yahoo.com/q/op?s=A+Options'
root=lxml.html.parse(sfile).getroot()
t = root.xpath("//table[@class='yfnc_datamodoutline1']")[0]
trs=t.xpath(".//tr")
for  i, tr  in  enumerate(trs):
        print (i, len(tr),tr.text_content())

the output is:
0 1 StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70 0.007.007.4531528.00A111022C000280004.35 0.004.654.7520121029.00A111022C000290003.80 0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35 0.000.340.354429339.00A111022C000390000.16 0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33 0.000.100.14218442.00A111022C000420000.08 0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
1 8 StrikeSymbolLastChgBidAskVolOpen Int
2 8 25.00A111022C0002500010.70 0.007.007.45315
3 8 28.00A111022C000280004.35 0.004.654.75201210
4 8 29.00A111022C000290003.80 0.003.954.05426425
5 8 30.00A111022C000300003.110.013.253.355597
6 8 31.00A111022C000310002.700.162.662.717407
7 8 32.00A111022C000320002.110.082.122.172364
8 8 33.00A111022C000330001.870.311.651.7029568
9 8 34.00A111022C000340001.360.151.261.3026649
10 8 35.00A111022C000350000.960.040.940.9845477
11 8 36.00A111022C000360000.720.120.690.7243786
12 8 37.00A111022C000370000.510.030.490.52511,435
13 8 38.00A111022C000380000.35 0.000.340.3544293
14 8 39.00A111022C000390000.16 0.000.220.269149
15 8 40.00A111022C000400000.180.030.150.1853301
16 8 41.00A111022C000410000.33 0.000.100.142184
17 8 42.00A111022C000420000.08 0.000.060.103147
18 8 45.00A111022C000450000.10 0.000.010.05200243

i want to know  why  i=0  the  tr.text_content()'s  value  is :
StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70 0.007.007.4531528.00A111022C000280004.35 0.004.654.7520121029.00A111022C000290003.80 0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35 0.000.340.354429339.00A111022C000390000.16 0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33 0.000.100.14218442.00A111022C000420000.08 0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
it's  strannge thing for me to understand.
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From contropinion at gmail.com  Sat Sep 24 00:49:10 2011
From: contropinion at gmail.com (contro opinion)
Date: Sat, 24 Sep 2011 12:49:10 +0800
Subject: parse html to get tr content
Message-ID: <CA+YdQ_4cRQpsRTt8A211yO0+1CmaYGCE=_20J4PD_baFnxz_Mw@mail.gmail.com>

here is my code:
import lxml.html
sfile='http://finance.yahoo.com/q/op?s=A+Options'<http://finance.yahoo.com/q/op?s=A+Options%27>
root=lxml.html.parse(sfile).getroot()
t = root.xpath("//table[@class='yfnc_datamodoutline1']")[0]
trs=t.xpath(".//tr")
for  i, tr  in  enumerate(trs):
        print (i, len(tr),tr.text_content())

the output is:
0 1 StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70
0.007.007.4531528.00A111022C000280004.35
0.004.654.7520121029.00A111022C000290003.80
0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35
0.000.340.354429339.00A111022C000390000.16
0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33
0.000.100.14218442.00A111022C000420000.08
0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
1 8 StrikeSymbolLastChgBidAskVolOpen Int
2 8 25.00A111022C0002500010.70 0.007.007.45315
3 8 28.00A111022C000280004.35 0.004.654.75201210
4 8 29.00A111022C000290003.80 0.003.954.05426425
5 8 30.00A111022C000300003.110.013.253.355597
6 8 31.00A111022C000310002.700.162.662.717407
7 8 32.00A111022C000320002.110.082.122.172364
8 8 33.00A111022C000330001.870.311.651.7029568
9 8 34.00A111022C000340001.360.151.261.3026649
10 8 35.00A111022C000350000.960.040.940.9845477
11 8 36.00A111022C000360000.720.120.690.7243786
12 8 37.00A111022C000370000.510.030.490.52511,435
13 8 38.00A111022C000380000.35 0.000.340.3544293
14 8 39.00A111022C000390000.16 0.000.220.269149
15 8 40.00A111022C000400000.180.030.150.1853301
16 8 41.00A111022C000410000.33 0.000.100.142184
17 8 42.00A111022C000420000.08 0.000.060.103147
18 8 45.00A111022C000450000.10 0.000.010.05200243

i want to know  why  i=0  the  tr.text_content()'s  value  is :
StrikeSymbolLastChgBidAskVolOpen Int25.00A111022C0002500010.70
0.007.007.4531528.00A111022C000280004.35
0.004.654.7520121029.00A111022C000290003.80
0.003.954.0542642530.00A111022C000300003.110.013.253.35559731.00A111022C000310002.700.162.662.71740732.00A111022C000320002.110.082.122.17236433.00A111022C000330001.870.311.651.702956834.00A111022C000340001.360.151.261.302664935.00A111022C000350000.960.040.940.984547736.00A111022C000360000.720.120.690.724378637.00A111022C000370000.510.030.490.52511,43538.00A111022C000380000.35
0.000.340.354429339.00A111022C000390000.16
0.000.220.26914940.00A111022C000400000.180.030.150.185330141.00A111022C000410000.33
0.000.100.14218442.00A111022C000420000.08
0.000.060.10314745.00A111022C000450000.10 0.000.010.05200243
it's  strannge thing for me to understand.
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From flt.johnson at gmail.com  Sat Sep 24 00:58:58 2011
From: flt.johnson at gmail.com (Fletcher Johnson)
Date: Fri, 23 Sep 2011 21:58:58 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<mailman.1412.1316836724.27778.python-list@python.org>
Message-ID: <e78742d2-5933-4f0b-82b4-7799d8156e43@i28g2000yqn.googlegroups.com>

On Sep 23, 11:58?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Sep 23, 2011 at 8:36 PM, Fletcher Johnson <flt.john... at gmail.com> wrote:
> > The topic says it all:
> > Why is shutil named shutil? What does it stand for? This is just a
> > mild curiosity of mine.
>
> "sh" is short for "shell", in line with Unix convention, where the
> default shell is located at /bin/sh.http://en.wikipedia.org/wiki/Shell_(computing)http://en.wikipedia.org/wiki/Unix_shell
>
> "util" is short for "utilities".
>
> shutil is a utility module used to accomplish tasks which one often
> does when in the shell, such as copying, moving, or removing directory
> trees. But shutil (to my knowledge) is not implemented using shell
> commands or by running external programs, so it thus avoids a whole
> host of shell-related issues.
>
> It's not the best name, but what with backwards compatibility and all,
> it's unlikely to change any time soon.
>
> Cheers,
> Chris
> --http://rebertia.com

I had a hunch it might have been that.


From atherun at gmail.com  Sat Sep 24 02:00:34 2011
From: atherun at gmail.com (Atherun)
Date: Fri, 23 Sep 2011 23:00:34 -0700 (PDT)
Subject: Python deadlock using subprocess.popen and communicate
References: <098f3d78-85f5-44e7-ba72-f2270a24d1b0@o9g2000vbo.googlegroups.com>
	<mailman.1342.1316662421.27778.python-list@python.org>
	<5f15781e-ca1c-404f-8984-f6c532047db9@8g2000yqm.googlegroups.com>
	<j5ensa$v1i$1@r03.glglgl.eu>
	<bec73d27-39b0-452d-8a91-8b5f5f95fac8@c20g2000prc.googlegroups.com>
	<pan.2011.09.22.17.44.08.952000@nowhere.com>
	<ef3ec6d8-e15a-44a5-82f0-a13220aaa5d7@15g2000prp.googlegroups.com>
	<pan.2011.09.23.05.59.12.10000@nowhere.com>
	<pan.2011.09.23.17.47.20.100000@nowhere.com>
	<2c7c883a-07b3-491c-b9f9-c7da8dc82399@f17g2000yqh.googlegroups.com>
	<mailman.1410.1316829803.27778.python-list@python.org>
Message-ID: <15570090-f674-46e6-8c2e-747b68da5672@n12g2000yqh.googlegroups.com>

On Sep 23, 7:03?pm, Matt Joiner <anacro... at gmail.com> wrote:
> how do you get the call stacks like this?
>
>
>
>
>
>
>
> On Sat, Sep 24, 2011 at 3:59 AM, Atherun <athe... at gmail.com> wrote:
> > On Sep 23, 10:47?am, Nobody <nob... at nowhere.com> wrote:
> >> On Fri, 23 Sep 2011 06:59:12 +0100, Nobody wrote:
> >> >> kernel32.dll!WaitForSingleObject+0x12
> >> >> python26.dll!_Py_svnversion+0xcf8
>
> >> > I haven't a clue how this happens. _Py_svnversion just returns a string:
>
> >> In retrospect, I think that's a red herring. 0xcf8 seems like too large an
> >> offset for such a small function. I think that it's more likely to be in a
> >> non-exported function, and _Py_svnversion just happens to be the last
> >> exported symbol prior to that point in the code.
>
> > I have the call stacks for each python thread running up until the
> > dead lock:
>
> > # ThreadID: 992
> > ?out, err = proc.communicate("change: new\ndescription: %s
> > \n"%changelistDesc)
> > File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> > communicate
> > ?return self._communicate(input)
> > File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> > _communicate
> > ?stdout_thread.join()
> > File: "c:\src\extern\python\lib\threading.py", line 637, in join
> > ?self.__block.wait()
> > File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> > ?waiter.acquire()
>
> > # ThreadID: 5516
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\extern\python\lib\threading.py", line 477, in run
> > ?self.__target(*self.__args, **self.__kwargs)
> > File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> > _readerthread
> > ?buffer.append(fh.read())
>
> > # ThreadID: 2668
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 69, in
> > run
> > ?self.stacktraces()
> > File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 86, in
> > stacktraces
> > ?fout.write(stacktraces())
> > File: "c:\src\scripts\auto\Autobuilder\StackTracer.py", line 26, in
> > stacktraces
> > ?for filename, lineno, name, line in traceback.extract_stack(stack):
>
> > # ThreadID: 3248
> > ?out, err = proc.communicate("change: new\ndescription: %s
> > \n"%changelistDesc)
> > File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> > communicate
> > ?return self._communicate(input)
> > File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> > _communicate
> > ?stdout_thread.join()
> > File: "c:\src\extern\python\lib\threading.py", line 637, in join
> > ?self.__block.wait()
> > File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> > ?waiter.acquire()
>
> > # ThreadID: 7700
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\extern\python\lib\threading.py", line 477, in run
> > ?self.__target(*self.__args, **self.__kwargs)
> > File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> > _readerthread
> > ?buffer.append(fh.read())
>
> > # ThreadID: 8020
> > ?out, err = proc.communicate("change: new\ndescription: %s
> > \n"%changelistDesc)
> > File: "c:\src\extern\python\lib\subprocess.py", line 689, in
> > communicate
> > ?return self._communicate(input)
> > File: "c:\src\extern\python\lib\subprocess.py", line 903, in
> > _communicate
> > ?stdout_thread.join()
> > File: "c:\src\extern\python\lib\threading.py", line 637, in join
> > ?self.__block.wait()
> > File: "c:\src\extern\python\lib\threading.py", line 237, in wait
> > ?waiter.acquire()
>
> > # ThreadID: 4252
> > File: "c:\src\extern\python\lib\threading.py", line 497, in
> > __bootstrap
> > ?self.__bootstrap_inner()
> > File: "c:\src\extern\python\lib\threading.py", line 525, in
> > __bootstrap_inner
> > ?self.run()
> > File: "c:\src\extern\python\lib\threading.py", line 477, in run
> > ?self.__target(*self.__args, **self.__kwargs)
> > File: "c:\src\extern\python\lib\subprocess.py", line 877, in
> > _readerthread
> > ?buffer.append(fh.read())
>
> > The StackTracer thread freezes trying to update my output file, and
> > yes I'm trying to 3 tasks in parallel which each one starts by
> > creating a changelist in perforce. ?This is just an easy repro case
> > for me, it happens with commands other then p4. ?This almost looks
> > like a threading issue more then the output deadlock.
> > --
> >http://mail.python.org/mailman/listinfo/python-list

I found the code for it here:
http://code.activestate.com/recipes/577334-how-to-debug-deadlocked-multi-threaded-programs/

There is some bugs in the code given but its pretty straight forward
to fix it.


From __peter__ at web.de  Sat Sep 24 02:48:29 2011
From: __peter__ at web.de (Peter Otten)
Date: Sat, 24 Sep 2011 08:48:29 +0200
Subject: can't load an script from html...
References: <88319FFD-88A4-49B6-B5CC-8748CC71D97C@elkasoluciones.com>
Message-ID: <j5jufp$fva$1@dough.gmane.org>

Ricardo wrote:

> Hi everyone
> I'm trying to use the cgi library to create a python script and loading it
> from a web page. I have already done the necessary imports, and the
> default commands to receive data from "html" are written too. The final
> version is something like this:
> 
> #!/usr/bin/python
> 
> import subprocess
> import cgi
> import cgitb
> 
> cgitb.enable()
> 
> input = cgi.FieldStorage()
> 
> ?. my code (do something with input)?.
> 
> 
> #printing the response
> 
> print "Content-Type: text/html"
> print
> print "<TITLE>My title:</TITLE>"
> print "</HEAD>"
> print "<BODY>"
> print ?.. bla bla ?
> print "%s"%theoutput
> print "</BODY>"
> 
> Besides, my call from my index.html is like this:
> 
>  <form action="/scripts/python_script.py" method="post">
>       <input name="inid" type="text" size="20" class="input" /><br/><br/>
>         <input type="submit" value="accept"  class="button"/>
>  </form>
> 
> well, the thing is that when i do the call from the browser:
> 
> http://localhost/index.html
>            |
>           V
> put the data and click on the "accept" button
>            |
>           V
> http:/localhost/scripts/python_script.py
> 
> I only get the python_script.py as a plain test by response (the script
> printed on my browser). I have already changed the permissions for
> python_script.py. I have checked the import cgi,cgitb in the python shell
> (i am using v2.7) and they work fine. So, i don't know what it is going
> wrong here.
> 
> A little help please? any idea?

Is your webserver configured to allow cgi scripts? In the scripts directory? 
For Apache see

http://httpd.apache.org/docs/current/howto/cgi.html

Python also comes with a CGI Server. A quick-and-dirty setup goes like this:

$ cat cgi-bin/script.py
#!/usr/bin/python
# -*- coding: utf-8 -*-

import cgi
import cgitb

cgitb.enable()

input = cgi.FieldStorage()

print "Content-Type: text/html"
print
print "<TITLE>My title:</TITLE>"
print "</HEAD>"
print "<BODY>"
print "Hello world"
print "</BODY>"
$ chmod a+x cgi-bin/script.py
$ python -m CGIHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...

If you then point your browser to http://localhost:8000/cgi-bin/script.py 
you should see 

Hello world 

in the browser and (something like)

localhost - - [24/Sep/2011 08:41:27] "GET /cgi-bin/script.py HTTP/1.1" 200 -

in the shell. Note that the script must be in cgi-bin (or htbin) unless you 
start the server with a custom script that modifies 
CGIHTTPRequestHandler.cgi_directories accordingly.



From steve+comp.lang.python at pearwood.info  Sat Sep 24 02:55:18 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 16:55:18 +1000
Subject: random.randint() slow, esp in Python 3
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
Message-ID: <4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> On Fri, Sep 23, 2011 at 4:14 AM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> What makes you think it's in C? I don't have Python 3.3a, but in 3.2 the
>> random module is mostly Python. There is an import of _random, which
>> presumably is in C, but it doesn't have a randint method:
> 
> True. It seems to be defined in cpython/lib/random.py as a reference
> to randrange, which does a pile of error checking and calls
> _randbelow... which does a whole lot of work as well as calling
> random(). Guess I should have checked the code before asking!
> 
> There's probably good reasons for using randint(), 

If you want unbiased, random (or at least pseudo-random) integers chosen
from an uniform distribution with proper error checking, you should use
randint or randrange.


> but if you just 
> want a pile of more-or-less random integers, int(random.random()*top)
> is the best option.

"I only need random-ish ints, but I need 'em yesterday!!!"

If you want biased, not-quite-uniformly distributed integers with no error
checking, then the above will save you a few nanoseconds per call. So if
your application needs a million such ints, you might save a full five
seconds or so. Sounds like premature optimization to me, but what do I
know? If you have an application where the quality of randomness is
unimportant and generating random ints is a genuine performance bottleneck,
then go right ahead.



>> I'm not seeing any significant difference in speed between 2.6 and 3.2:
>>
>> [steve at sylar ~]$ python2.6 -m timeit -s "from random import
>> randint" "randint(0, 1000000)"
>> 100000 loops, best of 3: 4.29 usec per loop
>>
>> [steve at sylar ~]$ python3.2 -m timeit -s "from random import
>> randint" "randint(0, 1000000)"
>> 100000 loops, best of 3: 4.98 usec per loop
> 
> That might be getting lost in the noise. Try the list comp that I had 
> above and see if you can see a difference - or anything else that
> calls randint that many times.

If you want to measure the speed of randint, you should measure the speed of
randint. That's what the timeit call does: it calls randint 100000 times.

You can't measure the speed of:

[random.randint(0,sz*10-1) for i in range(sz)]

and draw conclusions about randint alone. Roughly speaking, you are
measuring the time taken to:

lookup range
lookup sz, twice
call range, possibly generating a massive list
iterate over the list/range object
lookup random
lookup random.randint
multiply sz by 10 and subtract 1
build a list of the results, repeatedly resizing it as you go

(in no particular order)

There is MUCH more noise in your suggestion, not my version. But for what
it's worth, I get these results:

[steve at sylar ~]$ python3.2 -m timeit -s "import random" -s "sz =
1000000" "[random.randint(0,sz*10-1) for i in range(sz)]"
10 loops, best of 3: 6.09 sec per loop
[steve at sylar ~]$ python2.6 -m timeit -s "import random" -s "sz =
1000000" "[random.randint(0,sz*10-1) for i in range(sz)]"
10 loops, best of 3: 4.67 sec per loop

So Python 3.2 is about 30% slower for the whole mess. (I would, however,
give little confidence in those results: at 4-6 seconds per loop, I expect
that OS-level noise will be significant.)

For what (little) it's worth, it seems that Python 3.2 should be a bit
faster than 2.6, at least if you consider the Pystone benchmark to mean
anything.

http://www.levigross.com/post/2340736877/pystone-benchmark-on-2-6-2-7-3-2




> Performance-testing with a heapsort (and by the way, it's
> _ridiculously_ slower implementing it in Python instead of just
> calling a.sort(), but we all knew that already!) shows a similar
> difference in performance.

You do know that Python's heap implementation is written in C? Don't be
fooled by the heapq module being in Python. About 2/3rds of the way down,
there's a sneaky little trick:

# If available, use C implementation
try:
    from _heapq import *
except ImportError:
    pass


-- 
Steven



From Phillip.M.Feldman at gmail.com  Sat Sep 24 03:06:01 2011
From: Phillip.M.Feldman at gmail.com (Dr. Phillip M. Feldman)
Date: Sat, 24 Sep 2011 00:06:01 -0700 (PDT)
Subject: multinomial combinations
Message-ID: <32503896.post@talk.nabble.com>


I wrote a small generator function that produces multinomial combinations. 
(Python's itertools module does ordinary combinations, but not multinomial
combinations).  The code essentially works, except that the the last
combination in each tuple is not enclosed in a nested tuple:

In [2]: x= multinomial_combinations(range(7),[2,1,2])

In [3]: x.next()
Out[3]: ((0, 1), (2,), 3, 4)

(The 3 and 4 should be enclosed in a nested tuple).

Any suggestions as to what I'm doing wrong will be appreciated.  My code
follows:

def multinomial_combinations(items, ns):

   if len(ns) == 1:
      for c in itertools.combinations(items, ns[0]):
         yield c

   else:
      for c_first in itertools.combinations(items, ns[0]):
         items_remaining= set(items) - set(c_first)
         for c_other in multinomial_combinations(items_remaining, ns[1:]):
            yield (c_first,) + c_other
-- 
View this message in context: http://old.nabble.com/multinomial-combinations-tp32503896p32503896.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From clp2 at rebertia.com  Sat Sep 24 03:35:42 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 24 Sep 2011 00:35:42 -0700
Subject: multinomial combinations
In-Reply-To: <32503896.post@talk.nabble.com>
References: <32503896.post@talk.nabble.com>
Message-ID: <CAMZYqRQKVgWjO8ZVyaL0+yQ80i+qVTJccVp8BHXC6k8fzf5eKw@mail.gmail.com>

On Sat, Sep 24, 2011 at 12:06 AM, Dr. Phillip M. Feldman
<Phillip.M.Feldman at gmail.com> wrote:
>
> I wrote a small generator function that produces multinomial combinations.
> (Python's itertools module does ordinary combinations, but not multinomial
> combinations). ?The code essentially works, except that the the last
> combination in each tuple is not enclosed in a nested tuple:
>
> In [2]: x= multinomial_combinations(range(7),[2,1,2])
>
> In [3]: x.next()
> Out[3]: ((0, 1), (2,), 3, 4)
>
> (The 3 and 4 should be enclosed in a nested tuple).
>
> Any suggestions as to what I'm doing wrong will be appreciated. ?My code
> follows:
>
> def multinomial_combinations(items, ns):
>
> ? if len(ns) == 1:
> ? ? ?for c in itertools.combinations(items, ns[0]):
> ? ? ? ? yield c

FWIW, changing the base case to:

    if not ns:
        yield ()

appears to fix the issue. (Disclaimer: Have not done additional testing.)

Cheers,
Chris

> ? else:
> ? ? ?for c_first in itertools.combinations(items, ns[0]):
> ? ? ? ? items_remaining= set(items) - set(c_first)
> ? ? ? ? for c_other in multinomial_combinations(items_remaining, ns[1:]):
> ? ? ? ? ? ?yield (c_first,) + c_other


From arnodel at gmail.com  Sat Sep 24 03:43:17 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 08:43:17 +0100
Subject: multinomial combinations
In-Reply-To: <32503896.post@talk.nabble.com>
References: <32503896.post@talk.nabble.com>
Message-ID: <CAJ6cK1bH=zzWNTRU-k9w-Uev2oKUyGOV16gNMg1XkPmFLEw3xA@mail.gmail.com>

(sorry about the top posting)

Change yield c to yield (c,)

HTH

Arnaud

PS: you could also change the if ... To

If not ns:
    Yield ((),)
Else:
    ...
On Sep 24, 2011 8:06 AM, "Dr. Phillip M. Feldman" <
Phillip.M.Feldman at gmail.com> wrote:
>
> I wrote a small generator function that produces multinomial combinations.

> (Python's itertools module does ordinary combinations, but not multinomial
> combinations). The code essentially works, except that the the last
> combination in each tuple is not enclosed in a nested tuple:
>
> In [2]: x= multinomial_combinations(range(7),[2,1,2])
>
> In [3]: x.next()
> Out[3]: ((0, 1), (2,), 3, 4)
>
> (The 3 and 4 should be enclosed in a nested tuple).
>
> Any suggestions as to what I'm doing wrong will be appreciated. My code
> follows:
>
> def multinomial_combinations(items, ns):
>
> if len(ns) == 1:
> for c in itertools.combinations(items, ns[0]):
> yield c
>
> else:
> for c_first in itertools.combinations(items, ns[0]):
> items_remaining= set(items) - set(c_first)
> for c_other in multinomial_combinations(items_remaining, ns[1:]):
> yield (c_first,) + c_other
> --
> View this message in context:
http://old.nabble.com/multinomial-combinations-tp32503896p32503896.html
> Sent from the Python - python-list mailing list archive at Nabble.com.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
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From iamforufriends at gmail.com  Sat Sep 24 04:34:26 2011
From: iamforufriends at gmail.com (hot girl)
Date: Sat, 24 Sep 2011 01:34:26 -0700 (PDT)
Subject: want to meet a new girlfriend for free
Message-ID: <7f26bf3c-5fa9-4514-a5f3-0f4acbc57720@i9g2000yqe.googlegroups.com>

want to meet a new girlfriend for free

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas

http://tinyurl.com/3v24v6e


From steve+comp.lang.python at pearwood.info  Sat Sep 24 04:57:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 18:57:01 +1000
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>

Matt wrote:

> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins.

Mixins considered harmful:
http://www.artima.com/weblogs/viewpost.jsp?thread=246341
http://www.artima.com/weblogs/viewpost.jsp?thread=246483

Mixins are much too easy to abuse, but there are uses for them.

I have found mixins useful for testing. If I have a bunch of functions that
take mostly similar unit tests, I create a mixin for the common unit tests,
then apply them to the tests.

Suppose I have two functions, ham and spam, which are unrelated but do share
some common behaviours. Since they are unrelated, I don't want the spam
test suite to inherit from the ham test suite, or vice versa, but I don't
want to write the same tests multiple times. (Especially when I add cheese,
egg and tomato functions.) So I put the common behaviours in a mixin class:

class StandardTestMixin:
    def test_requires_one_argument(self):
        self.assertRaises(TypeError, self.func)
    def test_has_docstring(self):
        self.assertTrue(self.func.__doc__)

class TestHam(unittest.TestCase, StandardTestMixin):
    ...

class TestSpam(unittest.TestCase, StandardTestMixin):
    ...


In this case, I simply don't care that the use of a mixin implies that
TestHam is a StandardTestMixin. I treat that as an accident of
implementation: it makes no practical difference, since I write no code
that depends on isinstance(instance, StandardTestMixin).



[...]
> In terms of code, lets say we have the following classes:
> 
> class Animal
> class Yamlafiable
> class Cat(Animal, Yamlafiable)
> class Dog(Animal, Yamlafiable)
> 
> I've got an Animal that does animal things, a Cat that does cat things
> and a Dog that does dog things. I've also got a Yamlafiable class that
> does something clever to generically convert an object into Yaml in
> some way. Looking at these classes I can see that a Cat is an Animal,
> a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
> Yamlafiable? and a Cat is a Yamlafiable? Is that really true?

That depends on what you want.

Python says is that issubclass(Cat, Yamlafiable) will return True. The
*interpretation* of that fact is entirely up to you. If you want to
interpret it as meaning that cats are Yamlafiables, go right ahead. If you
want to interpret it as a technical result with no semantic meaning, that's
fine too. After all, just because "ram" in "programming" returns True
doesn't actually mean anything about male sheep and computing.

The map is not the territory, and object-oriented ancestor/descendant
relationships are not the same as real life relationships. It's a tool,
nothing more, and if the metaphor starts to creak at the edges, oh well, so
much for the metaphor.

In fact, even in real life, the ancestor/descendant metaphor creaks. What
should we make of bacteria which exchange DNA with other species of
bacteria? Which is the ancestor and which is the descendant? How about
symbionts like lichen? What about when we splice genes from one species
into another? So even in real life, there are multiple inheritance and
mixins.



> If my 
> objects are categorized correctly, in the correct inheritance
> hierarchy shouldn't that make more sense? Cats and Dogs aren't
> Yamlafiable, that doesn't define what they are, rather it defines
> something that they can do because of things that they picked up from
> their friend the Yamlafile.

The standard metaphor for inheritance in OOP doesn't include "learning
things from a friend". It is a very simple metaphor: everything is
either "is-a" or "has-a". If you inherit from a class, the is-a
relationship holds. If you don't want that, you can use composition
instead:

class Cat(Animal):
    def __init__(self, yamlifier):
        self.yamlifier = yamlifier
    def make_yaml(self):
        self.yamlifier.make_yaml(self, self.spam)

Now we say that a Cat has-a Yamlafiable.


> This is just a ridiculous example, but I think it is valid to say that
> these things shouldn't be limited to inherit functionality only from
> their parents, that they can pick other things up along the way as
> well. Which is easy to do, right?
> 
> Dog.something_new = something_new

And that works in Python. But the thing is, which would you rather write?

#1
class Dog(Animal, Yamlafiable):
    pass

or this?

#2
class Dog(Animal):
    pass

Dog.__dict__.update(Yamlafiable.__dict__)


But wait! The two aren't the same. There are quite big differences in
behaviour between inheritance and attribute injection:

* In the case of inheritance, attributes defined by Animal take 
  precedence over those defined by Yamlafiable. In the case of 
  injection, the opposite is the case.

* In the case of inheritance, attributes defined by Yamlafiable's
  superclasses are reachable. In the case of injection, they 
  aren't (at least not without more work).

* Inheritance is late-binding, injection is early-binding: if 
  you dynamically add a new method to Yamlafiable, Dog will 
  see the change in the first case but not the second.


That's not to say that one is right and the other is wrong. They're just
different. Use whichever tool you prefer.

Another option is straits:

http://www.artima.com/weblogs/viewpost.jsp?thread=246488



-- 
Steven



From chris at simplistix.co.uk  Sat Sep 24 05:27:07 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Sat, 24 Sep 2011 10:27:07 +0100
Subject: MailingLogger 3.5.0 Released!
Message-ID: <4E7DA26B.5090202@simplistix.co.uk>

I'm pleased to announce a new release of Mailinglogger.

Mailinglogger provides two handlers for the standard python
logging framework that enable log entries to be emailed either as the
entries are logged or as a summary at the end of the running process.

The handlers have the following features:

- customisable and dynamic subject lines for emails sent

- emails sent with a configurable headers for easy filtering

- flood protection to ensure the number of emails sent is not excessive

- support for SMTP servers that require authentication

- fully documented and tested

The only change for this release was to add an X-Log-Level header to 
emails sent. For MailingLogger, this is the level of the log message 
being emailed. For SummarisingLogger this is the highest level of any of 
the messages handled.

Full docs can be found here:

http://packages.python.org/mailinglogger/

For more information, please see:
http://www.simplistix.co.uk/software/python/mailinglogger
or
http://pypi.python.org/pypi/mailinglogger

cheers,

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk





From ian.g.kelly at gmail.com  Sat Sep 24 05:38:14 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Sat, 24 Sep 2011 03:38:14 -0600
Subject: random.randint() slow, esp in Python 3
In-Reply-To: <4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
	<4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CALwzidm4KepCkwz1jrxiHVeyRSnvENi9Wd2_kKpVTChqD4EhcQ@mail.gmail.com>

On Sat, Sep 24, 2011 at 12:55 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> If you want unbiased, random (or at least pseudo-random) integers chosen
> from an uniform distribution with proper error checking, you should use
> randint or randrange.
>
>
>> but if you just
>> want a pile of more-or-less random integers, int(random.random()*top)
>> is the best option.
>
> "I only need random-ish ints, but I need 'em yesterday!!!"
>
> If you want biased, not-quite-uniformly distributed integers with no error
> checking, then the above will save you a few nanoseconds per call. So if
> your application needs a million such ints, you might save a full five
> seconds or so. Sounds like premature optimization to me, but what do I
> know? If you have an application where the quality of randomness is
> unimportant and generating random ints is a genuine performance bottleneck,
> then go right ahead.

Peeking under the hood, after all the error-checking and extra
features, randrange basically just does int(random.random() * top).
Any bias present in the latter will also be present in the former.

Cheers,
Ian


From pavlovevidence at gmail.com  Sat Sep 24 05:58:37 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 24 Sep 2011 02:58:37 -0700 (PDT)
Subject: Python Mixins
In-Reply-To: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <20110522.2658.1316858317611.JavaMail.geo-discussion-forums@prfb12>

On Thursday, September 22, 2011 2:14:39 PM UTC-7, Matt wrote:
[snip]
> class MyMixin(object):
>     def one_thing(self):
>         return "something cool"
> 
> @mixin(MyMixin)
> class MyClass(object):
>     pass
> 
> x = MyClass()
> x.one_thing() == 'something cool'
> x.__class__.__bases__ ==  (object,)
> 
> To me, this is much more concise. By looking at this I can tell what
> MyClass IS, who it's parents are and what else it can do. I'm very
> interested to know if there are others who feel as dirty as I do when
> using inheritance for mixins

Not me.  Inheritance perfectly encompasses the mixin relationship, and because inheritance is so thoroughly ingrained in Python, it makes sense not to create a completely different mechanism to share behavior just for the case of mixins.

I know that, as someone who reads code, I would rather coders stick to well-known mechanisms than to create their own ad hoc mechanisms that don't actually add any new capability.  Take your MyClass example above.  If you had stuck to inheritance I could have seen what classes all the behavior was implemented by listing the __bases__.  But since you used an ad hoc mechanism, now I have to track down where the hell that one_thing() method is coming from.

No mechanism is ever perfect, and Python's MI is very far from perfect, but sticking to well-known and understood methods is usually more important than whatever little improvement you can make.  (And it is little; best as I can tell, your main objection is that mixins make it harder to see what the "main" parent is.  I'd say that's a dubious justification to spring a new behavior-sharing mechanism on a reader.)


> or if there are other things that Python
> developers are doing to mix in functionality without using inheritance
> or if the general populous of the Python community disagrees with me
> and thinks that this is a perfectly valid use of inheritance.

I'd guess the majority just use inheritance, although I can't say I've seen enough code out there to gauge it.

But there is something else a lot of Pythonistas will do in many cases: just define regular functions.  In your example, instead of defining one_thing() as a method of a mixin, define it as a function.  Personally, I find that I almost never use mixins, though I have absolutely nothing against them and I use MI and metaclasses all the time.  It's just that for most things I'd use a mixin for, I find that one or two regular functions work perfectly well.


Carl Banks


From pavlovevidence at gmail.com  Sat Sep 24 06:23:11 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 24 Sep 2011 03:23:11 -0700 (PDT)
Subject: Python Mixins
In-Reply-To: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <16852897.463.1316859791599.JavaMail.geo-discussion-forums@prng5>

On Thursday, September 22, 2011 2:14:39 PM UTC-7, Matt wrote:
> In terms of code, lets say we have the following classes:
> 
> class Animal
> class Yamlafiable
> class Cat(Animal, Yamlafiable)
> class Dog(Animal, Yamlafiable)
> 
> I've got an Animal that does animal things, a Cat that does cat things
> and a Dog that does dog things. I've also got a Yamlafiable class that
> does something clever to generically convert an object into Yaml in
> some way. Looking at these classes I can see that a Cat is an Animal,
> a Dog is an Animal, a Dog is not a Cat, a Cat is not a Dog, a Dog is a
> Yamlafiable? and a Cat is a Yamlafiable? Is that really true?

Yes.

I hope you are not confusing Cats with cats.


> If my
> objects are categorized correctly, in the correct inheritance
> hierarchy shouldn't that make more sense? Cats and Dogs aren't
> Yamlafiable, that doesn't define what they are, rather it defines
> something that they can do because of things that they picked up from
> their friend the Yamlafile.

The whole point of OOP is that objects are defined by their behavior.  A Cat is whatever it can do.  A Dog is whatever it can do.  If a Cat is yamlafiable, then it's coorect to say that a Cat is a Yamlafible (even if a cat isn't).


Carl Banks


From enleverLesX_XXmcX at XmclavXeauX.com.invalid  Sat Sep 24 07:48:29 2011
From: enleverLesX_XXmcX at XmclavXeauX.com.invalid (Michel Claveau - MVP)
Date: Sat, 24 Sep 2011 13:48:29 +0200
Subject: pyWin build 216
References: <1419f880-35a8-4a9f-aff9-52c07742f347@c29g2000yqd.googlegroups.com>
Message-ID: <4e7dc38c$0$18801$ba4acef3@reader.news.orange.fr>

Hi!

Me, because some bugs in 216, I come back to 214...
(215 has another bugs).

@-salutations
-- 
MCi


From rosuav at gmail.com  Sat Sep 24 08:33:50 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 24 Sep 2011 22:33:50 +1000
Subject: random.randint() slow, esp in Python 3
In-Reply-To: <4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
	<4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmr9gGOrBba0j3icKyQ5bVNS6d68jYed8-x=JbVQZeWKOQ@mail.gmail.com>

On Sat, Sep 24, 2011 at 4:55 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Chris Angelico wrote:
>
> If you want unbiased, random (or at least pseudo-random) integers chosen
> from an uniform distribution with proper error checking, you should use
> randint or randrange.
>
> "I only need random-ish ints, but I need 'em yesterday!!!"

All I want is some data to sort, so that I can verify that my
implementation is doing the same thing in every language that I write
it in. Doesn't have to be casino-level purity of randomness.

> You can't measure the speed of:
>
> [random.randint(0,sz*10-1) for i in range(sz)]
>
> and draw conclusions about randint alone.

Sure, but by comparing the two lines of code (one with randint and one
with random()), the other aspects can be cancelled out.

> For what (little) it's worth, it seems that Python 3.2 should be a bit
> faster than 2.6, at least if you consider the Pystone benchmark to mean
> anything.
>
> http://www.levigross.com/post/2340736877/pystone-benchmark-on-2-6-2-7-3-2

That's what I would normally expect, that the new version outperforms
the old - regardless of the program and the context. Exceptions need
justification (as in the case of int/long vs just int - Py2 often
outperforms Py3 when all the numbers fit inside machine int).

> You do know that Python's heap implementation is written in C? Don't be
> fooled by the heapq module being in Python.

I didn't know, but it doesn't surprise me. But my purpose wasn't to
sort the integers, it was to play with a particular hand-rolled
implementation of a heap sort in multiple languages and make sure it
was producing consistent results.

ChrisA


From dickinsm at gmail.com  Sat Sep 24 08:53:41 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 05:53:41 -0700 (PDT)
Subject: random.randint() slow, esp in Python 3
References: <mailman.1371.1316713198.27778.python-list@python.org>
	<4e7b7afa$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1378.1316733767.27778.python-list@python.org>
	<4e7d7ed7$0$29973$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1422.1316857125.27778.python-list@python.org>
Message-ID: <94662e3d-5551-4ead-a067-9a381a402b43@i28g2000yqn.googlegroups.com>

On Sep 24, 10:38?am, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Sat, Sep 24, 2011 at 12:55 AM, Steven D'Aprano
>
>
>
>
>
>
>
>
>
> <steve+comp.lang.pyt... at pearwood.info> wrote:
> > If you want unbiased, random (or at least pseudo-random) integers chosen
> > from an uniform distribution with proper error checking, you should use
> > randint or randrange.
>
> >> but if you just
> >> want a pile of more-or-less random integers, int(random.random()*top)
> >> is the best option.
>
> > "I only need random-ish ints, but I need 'em yesterday!!!"
>
> > If you want biased, not-quite-uniformly distributed integers with no error
> > checking, then the above will save you a few nanoseconds per call. So if
> > your application needs a million such ints, you might save a full five
> > seconds or so. Sounds like premature optimization to me, but what do I
> > know? If you have an application where the quality of randomness is
> > unimportant and generating random ints is a genuine performance bottleneck,
> > then go right ahead.
>
> Peeking under the hood, after all the error-checking and extra
> features, randrange basically just does int(random.random() * top).
> Any bias present in the latter will also be present in the former.
>
> Cheers,
> Ian

In Python 2.x that's true, and indeed randrange has some fairly bad
behaviour for large arguments ( see http://bugs.python.org/issue9025
).  In Python 3.2 and up, randrange is more careful:  it doesn't
introduce any extra bias beyond that already present in the random
source (Mersenne Twister).  If you look at the source, you'll see that
Python 2.x only calls _getrandbits for large arguments, while Python
3.2+ calls _getrandbits for *every* invocation of randrange.  (All
assuming that we're using the default MT random number generator.)
This may well explain the difference in timings observed by the OP.

--
Mark


From steve+comp.lang.python at pearwood.info  Sat Sep 24 09:53:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sat, 24 Sep 2011 23:53:26 +1000
Subject: Generating equally-spaced floats with least rounding error
Message-ID: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>

I'm trying to generate a sequence of equally-spaced numbers between a lower
and upper limit. Given arbitrary limits, what is the best way to generate a
list of equally spaced floats with the least rounding error for each point?

For example, suppose I want to divide the range 0 to 2.1 into 7 equal
intervals, then the end-points of each interval are:

(0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)

and I'd like to return the values in the brackets. Using Decimal or Fraction
is not an option, I must use floats. If the exact value isn't representable
as a float, I'm okay with returning the nearest possible float.

The width of each interval is:

width = (2.1 - 0.0)/7

The relevant points can be calculated in either of two methods:

#1 add multiples of the width to the starting value, 0.

#2 subtract multiples of width from the ending value, 2.1.

(Repeated addition or subtraction should be avoided, as it increases the
amount of rounding error.)

Mathematically the two are equivalent, but due to rounding, they may not be.
Here's a run using Python 3.2:

>>> [0.0 + i*width for i in range(8)]
[0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]

The 4th and 7th values have rounding errors, the rest are exact.


>>> [2.1 - (7-i)*width for i in range(8)]
[0.0, 0.30000000000000027, 0.6000000000000001, 0.9000000000000001,
1.2000000000000002, 1.5, 1.8, 2.1]

The 2nd, 3rd, 4th and 5th values have rounding errors. Note that the 7th
value is exact here, but not above.

Is there a way to pick between methods #1 and #2 (or some combination of the
two) without human intervention so as to minimise the rounding error? Or is
there some other way to generate equally-spaced floats? My efforts at
googling have not been helpful.



-- 
Steven



From rosuav at gmail.com  Sat Sep 24 09:58:32 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 24 Sep 2011 23:58:32 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmr4=+c8qf+at+BuUZ4xbfDg5cBD4PMDmu1NBzM1NMhJ-g@mail.gmail.com>

On Sat, Sep 24, 2011 at 11:53 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> #1 add multiples of the width to the starting value, 0.
>
> #2 subtract multiples of width from the ending value, 2.1.

#3, go half and half - generate the lower half by adding to the lower
bound, and the upper half by subtracting from the upper bound. Not
sure if it'll help or not but it might be worth a shot.

ChrisA


From vlastimil.brom at gmail.com  Sat Sep 24 10:17:40 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sat, 24 Sep 2011 16:17:40 +0200
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <CAPTjJmr4=+c8qf+at+BuUZ4xbfDg5cBD4PMDmu1NBzM1NMhJ-g@mail.gmail.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<CAPTjJmr4=+c8qf+at+BuUZ4xbfDg5cBD4PMDmu1NBzM1NMhJ-g@mail.gmail.com>
Message-ID: <CAHzaPEM15_Od+yFqhRjyk39iN3YVWvfybWnX1KSw3qEWwOOzPw@mail.gmail.com>

2011/9/24 Chris Angelico <rosuav at gmail.com>:
> On Sat, Sep 24, 2011 at 11:53 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> #1 add multiples of the width to the starting value, 0.
>>
>> #2 subtract multiples of width from the ending value, 2.1.
>
> #3, go half and half - generate the lower half by adding to the lower
> bound, and the upper half by subtracting from the upper bound. Not
> sure if it'll help or not but it might be worth a shot.
>
> ChrisA
> --
Just a naive way:
#4 compute the values in both directions and use the average of the
results (of, course, given, there isn't a better way to distinguish
the values showing rounding errors automatically).

(I guess dealing manually with values obtained by .as_integer_ratio()
doesn't count as pure float operation...)

   vbr


From arnodel at gmail.com  Sat Sep 24 10:18:44 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 15:18:44 +0100
Subject: Generating equally-spaced floats with least rounding error
Message-ID: <CAJ6cK1YiOei8AcrbMpRTwake0ZTZB8rQVUMSWg7WLYS-J+XYmg@mail.gmail.com>

On Sep 24, 2011 2:59 PM, "Chris Angelico" <rosuav at gmail.com> wrote:
>
> On Sat, Sep 24, 2011 at 11:53 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
> > #1 add multiples of the width to the starting value, 0.
> >
> > #2 subtract multiples of width from the ending value, 2.1.
>
> #3, go half and half - generate the lower half by adding to the lower
> bound, and the upper half by subtracting from the upper bound. Not

#4 the barycentric approach.

    ((n-i)*a + i*b)/n for i in range(n+1)

Gives you n+1 equally spaced values between a and b inclusive

Arnaud
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From mwilson at the-wire.com  Sat Sep 24 10:26:08 2011
From: mwilson at the-wire.com (Mel)
Date: Sat, 24 Sep 2011 10:26:08 -0400
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5kp9v$q3d$1@speranza.aioe.org>

Steven D'Aprano wrote:

> I'm trying to generate a sequence of equally-spaced numbers between a
> lower and upper limit. Given arbitrary limits, what is the best way to
> generate a list of equally spaced floats with the least rounding error for
> each point?
> 
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
> 
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
> 
> and I'd like to return the values in the brackets. Using Decimal or
> Fraction is not an option, I must use floats. If the exact value isn't
> representable as a float, I'm okay with returning the nearest possible
> float.
> 
> The width of each interval is:
> 
> width = (2.1 - 0.0)/7
> 
> The relevant points can be calculated in either of two methods:
> 
> #1 add multiples of the width to the starting value, 0.
> 
> #2 subtract multiples of width from the ending value, 2.1.
> 
> (Repeated addition or subtraction should be avoided, as it increases the
> amount of rounding error.)
> 
> Mathematically the two are equivalent, but due to rounding, they may not
> be. Here's a run using Python 3.2:
> 
>>>> [0.0 + i*width for i in range(8)]
> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
> 
> The 4th and 7th values have rounding errors, the rest are exact.
> 
> 
>>>> [2.1 - (7-i)*width for i in range(8)]
> [0.0, 0.30000000000000027, 0.6000000000000001, 0.9000000000000001,
> 1.2000000000000002, 1.5, 1.8, 2.1]
> 
> The 2nd, 3rd, 4th and 5th values have rounding errors. Note that the 7th
> value is exact here, but not above.
> 
> Is there a way to pick between methods #1 and #2 (or some combination of
> the two) without human intervention so as to minimise the rounding error?
> Or is there some other way to generate equally-spaced floats? My efforts
> at googling have not been helpful.

When I've done this with ints (usually in small embedded systems) I've 
always preferred

low_limit + (total_width * i) / intervals

since it does the rounding on the biggest numbers where proportional error 
will be least, and it's guaranteed to hit the low_limit and high_limit 
exactly (as exactly as they can be represented, anyway.)

	Mel.



From lists at cheimes.de  Sat Sep 24 10:56:59 2011
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 24 Sep 2011 16:56:59 +0200
Subject: Python 2.5 zlib trouble
In-Reply-To: <78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
Message-ID: <j5kr3r$fgr$1@dough.gmane.org>

Am 23.09.2011 23:34, schrieb Jesramz:
> Im running on Ubuntu Natty and I am not running a self-compiled
> install, its a regular release. 

Ubuntu Natty doesn't come with Python 2.5. How did you install Python
2.5 on Natty? If you used some sort of installer or 3rd party
repository, there is a big chance that the installer doesn't understand
multiarch.

Christian



From dickinsm at gmail.com  Sat Sep 24 11:17:49 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 08:17:49 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>

On Sep 24, 2:53?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> I'm trying to generate a sequence of equally-spaced numbers between a lower
> and upper limit. Given arbitrary limits, what is the best way to generate a
> list of equally spaced floats with the least rounding error for each point?
>
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
>
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>
> and I'd like to return the values in the brackets. Using Decimal or Fraction
> is not an option, I must use floats. If the exact value isn't representable
> as a float, I'm okay with returning the nearest possible float.

Can you explain why you're constrained not to use Fraction?  Speed?

Using Fraction for intermediate calculations actually works perfectly
for this, since conversions from float to Fraction are exact, while
conversions from Fraction to float are correctly rounded.  So if
you're using Python, you're not too bothered about efficiency, and you
want provably correctly-rounded results, why not use Fraction?

>>> from fractions import Fraction
>>> start, stop, n = 0.0, 2.1, 7
>>> [float(Fraction(start) + i * (Fraction(stop) - Fraction(start)) / n) for i in range(n+1)]
[0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]

--
Mark



From steve+comp.lang.python at pearwood.info  Sat Sep 24 12:46:39 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 02:46:39 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
Message-ID: <4e7e0971$0$30000$c3e8da3$5496439d@news.astraweb.com>

Mark Dickinson wrote:

> On Sep 24, 2:53?pm, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
>> I'm trying to generate a sequence of equally-spaced numbers between a
>> lower and upper limit. Given arbitrary limits, what is the best way to
>> generate a list of equally spaced floats with the least rounding error
>> for each point?
>>
>> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
>> intervals, then the end-points of each interval are:
>>
>> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>>
>> and I'd like to return the values in the brackets. Using Decimal or
>> Fraction is not an option, I must use floats. If the exact value isn't
>> representable as a float, I'm okay with returning the nearest possible
>> float.
> 
> Can you explain why you're constrained not to use Fraction?  Speed?

Speed is important, but secondary to correctness. To be honest, I never even
thought of using fractions as an intermediate result -- I was thinking of
generating lists of Fractions. I think I can use this approach.

But out of curiosity, how would you do it using nothing but floats? Is there
a way?



-- 
Steven



From dickinsm at gmail.com  Sat Sep 24 12:55:35 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 09:55:35 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0971$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <44c72615-2455-469c-964f-6aacedeb705f@d17g2000yqa.googlegroups.com>

On Sep 24, 5:46?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Speed is important, but secondary to correctness. To be honest, I never even
> thought of using fractions as an intermediate result -- I was thinking of
> generating lists of Fractions. I think I can use this approach.

Speed could be improved greatly by using integer arithmetic (with some
help from the float.as_integer_ratio method) instead of using Fraction
directly, though it would require writing quite a lot more code;
Fraction's many and slow gcd calls for normalization are a problem
here, and since all denominators will be powers of 2 they're largely
unnecessary.

> But out of curiosity, how would you do it using nothing but floats? Is there
> a way?

Hmm.  Beyond writing my own multiple-precision integer library using
floats as the base type, I can't think of anything obvious. :-)

--
Mark


From steve+comp.lang.python at pearwood.info  Sat Sep 24 13:01:47 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 03:01:47 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
Message-ID: <4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>

Mark Dickinson wrote:

> Using Fraction for intermediate calculations actually works perfectly
> for this, since conversions from float to Fraction are exact, while
> conversions from Fraction to float are correctly rounded.  So if
> you're using Python, you're not too bothered about efficiency, and you
> want provably correctly-rounded results, why not use Fraction?
> 
>>>> from fractions import Fraction
>>>> start, stop, n = 0.0, 2.1, 7
>>>> [float(Fraction(start) + i * (Fraction(stop) - Fraction(start)) / n)
>>>> [for i in range(n+1)]
> [0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]


Ah, I knew it was too easy!

>>> from fractions import Fraction as F
>>> start, stop, n = 1, 3.1, 7
>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
[1.0, 1.3, 1.6, 1.9000000000000001, 2.2, 2.5, 2.8000000000000003, 3.1]
>>>
>>> start, stop, n = -1, 1.1, 7
>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
[-1.0, -0.7, -0.39999999999999997, -0.09999999999999996,
0.20000000000000004, 0.5000000000000001, 0.8, 1.1]



-- 
Steven



From rosuav at gmail.com  Sat Sep 24 13:03:14 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 03:03:14 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <j5kp9v$q3d$1@speranza.aioe.org>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<j5kp9v$q3d$1@speranza.aioe.org>
Message-ID: <CAPTjJmqGfi8rdYFYMSJMLv41CTah2P9eU1cgev6ZMeoz_Oz1nQ@mail.gmail.com>

On Sun, Sep 25, 2011 at 12:26 AM, Mel <mwilson at the-wire.com> wrote:
> low_limit + (total_width * i) / intervals
>

Definite improvement, if the range is comparatively small. Multiply
first, then divide.

ChrisA


From rosuav at gmail.com  Sat Sep 24 13:19:34 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 03:19:34 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmq19R5fJzCzUh9uRBsOzDRib+joF1C5S4dj4RQELFYRMw@mail.gmail.com>

On Sun, Sep 25, 2011 at 3:01 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Mark Dickinson wrote:
>
>> Using Fraction for intermediate calculations actually works perfectly
>> for this, since conversions from float to Fraction are exact, while
>> conversions from Fraction to float are correctly rounded. ?So if
>> you're using Python, you're not too bothered about efficiency, and you
>> want provably correctly-rounded results, why not use Fraction?
>>
> Ah, I knew it was too easy!

Try using Fraction for the start and stop too:
>>> from fractions import Fraction as F
>>> start,stop,n = F(0),F(21,10),7
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8, 1.1]

(Tested in Py 3.2 for Win)

ChrisA


From passiday at gmail.com  Sat Sep 24 13:31:21 2011
From: passiday at gmail.com (Passiday)
Date: Sat, 24 Sep 2011 10:31:21 -0700 (PDT)
Subject: Suggested coding style
Message-ID: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>

Hello,

I have started to code random stuff in Python only recently, still
lots to learn. So please bear with me if my question sounds like rant.

I have been coding in many other languages, most of the time it was
Java and C#. I don't like the function mess of PHP (ie, loads and
loads of functions without any namespaces etc), but I'd like to think
that Python is different.

In my brief coding experience I have stumbled upon Python zfill(width)
method, and I thought, really, do you have to include such a narrow-
purpose method in the basic method set? Perhaps there are more such
methods that are nice when you need them, but then again, you don't
put all the possible methods in the standard set.

Perhaps there is reason such method is in the basic library, and my
complaints are unbased? Or, perhaps the language is on course to bloat
out and get filled with tens and hundreds of special-purpose methods
that render the language structure chaotic?

Passiday


From dickinsm at gmail.com  Sat Sep 24 14:23:21 2011
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 24 Sep 2011 11:23:21 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <d133b3b9-d3d8-444a-ba8c-b372df7cdcd0@g29g2000yqh.googlegroups.com>

On Sep 24, 6:01?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Ah, I knew it was too easy!
>
> >>> from fractions import Fraction as F
> >>> start, stop, n = 1, 3.1, 7
> >>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
>
> [1.0, 1.3, 1.6, 1.9000000000000001, 2.2, 2.5, 2.8000000000000003, 3.1]

I believe that's still giving correctly-rounded results.  Note that
the stop value of 3.1 isn't exactly 3.1 here:  it's

    3.100000000000000088817841970012523233890533447265625

So the 4th value above is the closest float to 4/7 * 1.0 + 3/7 *
3.100000000000000088817841970012523233890533447265625.

--
Mark



From rick.mansilla at gmail.com  Sat Sep 24 14:50:26 2011
From: rick.mansilla at gmail.com (Ricardo Mansilla)
Date: Sat, 24 Sep 2011 13:50:26 -0500
Subject: Python-list Digest, Vol 96, Issue 137
In-Reply-To: <mailman.6665.1316848053.27777.python-list@python.org>
References: <mailman.6665.1316848053.27777.python-list@python.org>
Message-ID: <201109241350.27066.rick.mansilla@gmail.com>

On Saturday 24 September 2011 01:48:29 you wrote:
> Ricardo wrote:
> > Hi everyone
> > I'm trying to use the cgi library to create a python script and loading
> > it from a web page. I have already done the necessary imports, and the
> > default commands to receive data from "html" are written too. The final
> > version is something like this:
> > 
> > #!/usr/bin/python
> > 
> > import subprocess
> > import cgi
> > import cgitb
> > 
> > cgitb.enable()
> > 
> > input = cgi.FieldStorage()
> > 
> > ?. my code (do something with input)?.
> > 
> > 
> > #printing the response
> > 
> > print "Content-Type: text/html"
> > print
> > print "<TITLE>My title:</TITLE>"
> > print "</HEAD>"
> > print "<BODY>"
> > print ?.. bla bla ?
> > print "%s"%theoutput
> > print "</BODY>"
> > 
> > Besides, my call from my index.html is like this:
> >  <form action="/scripts/python_script.py" method="post">
> >  
> >       <input name="inid" type="text" size="20" class="input" /><br/><br/>
> >       
> >         <input type="submit" value="accept"  class="button"/>
> >  
> >  </form>
> > 
> > well, the thing is that when i do the call from the browser:
> > 
> > http://localhost/index.html
> > 
> >           V
> > 
> > put the data and click on the "accept" button
> > 
> >           V
> > 
> > http:/localhost/scripts/python_script.py
> > 
> > I only get the python_script.py as a plain test by response (the script
> > printed on my browser). I have already changed the permissions for
> > python_script.py. I have checked the import cgi,cgitb in the python shell
> > (i am using v2.7) and they work fine. So, i don't know what it is going
> > wrong here.
> > 
> > A little help please? any idea?
> 
> Is your webserver configured to allow cgi scripts? In the scripts
> directory? For Apache see
> 
> http://httpd.apache.org/docs/current/howto/cgi.html
> 
> Python also comes with a CGI Server. A quick-and-dirty setup goes like
> this:
> 
> $ cat cgi-bin/script.py
> #!/usr/bin/python
> # -*- coding: utf-8 -*-
> 
> import cgi
> import cgitb
> 
> cgitb.enable()
> 
> input = cgi.FieldStorage()
> 
> print "Content-Type: text/html"
> print
> print "<TITLE>My title:</TITLE>"
> print "</HEAD>"
> print "<BODY>"
> print "Hello world"
> print "</BODY>"
> $ chmod a+x cgi-bin/script.py
> $ python -m CGIHTTPServer
> Serving HTTP on 0.0.0.0 port 8000 ...
> 
> If you then point your browser to http://localhost:8000/cgi-bin/script.py
> you should see
> 
> Hello world
> 
> in the browser and (something like)
> 
> localhost - - [24/Sep/2011 08:41:27] "GET /cgi-bin/script.py HTTP/1.1" 200
> -
> 
> in the shell. Note that the script must be in cgi-bin (or htbin) unless you
> start the server with a custom script that modifies
> CGIHTTPRequestHandler.cgi_directories accordingly.


Thanks a lot, for your answer. Yes, i can run scripts from /cgi-bin/. Actually 
I follow you example and it works really well. I didn't know at all about this 
CGI server. 
I am doing the hole thing over python now, it's nice. 
Thanks again.

-- 
(...)Also, since that same law states that any system able to prove its 
consistency to itself must be inconsistent; any mind that believes it can 
prove its own sanity is, therefore, insane.(...) 
Kurt G?del. 
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From python at mrabarnett.plus.com  Sat Sep 24 15:03:31 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 24 Sep 2011 20:03:31 +0100
Subject: Suggested coding style
In-Reply-To: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <4E7E2983.10506@mrabarnett.plus.com>

On 24/09/2011 18:31, Passiday wrote:
> Hello,
>
> I have started to code random stuff in Python only recently, still
> lots to learn. So please bear with me if my question sounds like rant.
>
> I have been coding in many other languages, most of the time it was
> Java and C#. I don't like the function mess of PHP (ie, loads and
> loads of functions without any namespaces etc), but I'd like to think
> that Python is different.
>
> In my brief coding experience I have stumbled upon Python zfill(width)
> method, and I thought, really, do you have to include such a narrow-
> purpose method in the basic method set? Perhaps there are more such
> methods that are nice when you need them, but then again, you don't
> put all the possible methods in the standard set.
>
> Perhaps there is reason such method is in the basic library, and my
> complaints are unbased? Or, perhaps the language is on course to bloat
> out and get filled with tens and hundreds of special-purpose methods
> that render the language structure chaotic?
>
Considering that Python has been around for 20 years, there's not much
bloat. Most of the risk of that was early on, when any interest in the
language might have been welcomed. Now that its use has grown, it can
be more choosy.

.zfill does have its uses:

 >>> "-1".rjust(4, "0")
'00-1'
 >>> "-1".zfill(4)
'-001'


From tim at akwebsoft.com  Sat Sep 24 15:10:48 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sat, 24 Sep 2011 11:10:48 -0800
Subject: Suggested coding style
In-Reply-To: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <20110924191048.GH19422@johnsons-web.com>

* Passiday <passiday at gmail.com> [110924 09:47]:
<...>
> I have been coding in many other languages, most of the time it was
> Java and C#. I don't like the function mess of PHP (ie, loads and
> loads of functions without any namespaces etc), but I'd like to think
> that Python is different.
  It is ... 

> In my brief coding experience I have stumbled upon Python zfill(width)
> method, and I thought, really, do you have to include such a narrow-
> purpose method in the basic method set? Perhaps there are more such
> methods that are nice when you need them, but then again, you don't
> put all the possible methods in the standard set.
  I think that you have raised an interesting question here. I've
  been coding in python for 9 years and I have never used it. 

> Perhaps there is reason such method is in the basic library, and my
> complaints are unbased? 

  It could be some sort of legacy. I imagine we will hear from some
  more senior pythonists on this matter.

> Or, perhaps the language is on course to bloat
> out and get filled with tens and hundreds of special-purpose methods
> that render the language structure chaotic?

  From my observance, python has developed with care and prudence. I
  have a feeling (instinctive of course), that Guido van Rossum
  is/was more likely to say 'no' to a request for a new
  implementation that Rasmus Lerdorf.

  MTCW
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From python at mrabarnett.plus.com  Sat Sep 24 15:34:36 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 24 Sep 2011 20:34:36 +0100
Subject: Suggested coding style
In-Reply-To: <20110924191048.GH19422@johnsons-web.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
Message-ID: <4E7E30CC.3040402@mrabarnett.plus.com>

On 24/09/2011 20:10, Tim Johnson wrote:
> * Passiday<passiday at gmail.com>  [110924 09:47]:
> <...>
>> I have been coding in many other languages, most of the time it was
>> Java and C#. I don't like the function mess of PHP (ie, loads and
>> loads of functions without any namespaces etc), but I'd like to think
>> that Python is different.
>    It is ...
>
>> In my brief coding experience I have stumbled upon Python zfill(width)
>> method, and I thought, really, do you have to include such a narrow-
>> purpose method in the basic method set? Perhaps there are more such
>> methods that are nice when you need them, but then again, you don't
>> put all the possible methods in the standard set.
>    I think that you have raised an interesting question here. I've
>    been coding in python for 9 years and I have never used it.
>
>> Perhaps there is reason such method is in the basic library, and my
>> complaints are unbased?
>
>    It could be some sort of legacy. I imagine we will hear from some
>    more senior pythonists on this matter.
>
The documentation says "New in version 2.2.2".

>> Or, perhaps the language is on course to bloat
>> out and get filled with tens and hundreds of special-purpose methods
>> that render the language structure chaotic?
>
>     From my observance, python has developed with care and prudence. I
>    have a feeling (instinctive of course), that Guido van Rossum
>    is/was more likely to say 'no' to a request for a new
>    implementation that Rasmus Lerdorf.
>




From arnodel at gmail.com  Sat Sep 24 15:54:28 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 20:54:28 +0100
Subject: Suggested coding style
In-Reply-To: <4E7E30CC.3040402@mrabarnett.plus.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<4E7E30CC.3040402@mrabarnett.plus.com>
Message-ID: <CAJ6cK1Y5UJPs3n8WmO2MEKUUR9uZWaa9bFjWAR4D1P3T3GhGsA@mail.gmail.com>

On 24 September 2011 20:34, MRAB <python at mrabarnett.plus.com> wrote:

>>> In my brief coding experience I have stumbled upon Python zfill(width)
>>> method,
[...]
>> ? It could be some sort of legacy. I imagine we will hear from some
>> ? more senior pythonists on this matter.
>>
> The documentation says "New in version 2.2.2".

But zfill has been in the string module for a lot longer.

-- 
Arnaud


From arnodel at gmail.com  Sat Sep 24 15:55:34 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sat, 24 Sep 2011 20:55:34 +0100
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAJ6cK1Yi0LC7f1KZjPjmMCcDiOTKnhSUxAT8dsMu5nzGT9nr=A@mail.gmail.com>

On 24 September 2011 18:01, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Mark Dickinson wrote:
>
>> Using Fraction for intermediate calculations actually works perfectly
>> for this, since conversions from float to Fraction are exact, while
>> conversions from Fraction to float are correctly rounded. ?So if
>> you're using Python, you're not too bothered about efficiency, and you
>> want provably correctly-rounded results, why not use Fraction?
>>
>>>>> from fractions import Fraction
>>>>> start, stop, n = 0.0, 2.1, 7
>>>>> [float(Fraction(start) + i * (Fraction(stop) - Fraction(start)) / n)
>>>>> [for i in range(n+1)]
>> [0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>
>
> Ah, I knew it was too easy!
>
>>>> from fractions import Fraction as F
>>>> start, stop, n = 1, 3.1, 7
>>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
> [1.0, 1.3, 1.6, 1.9000000000000001, 2.2, 2.5, 2.8000000000000003, 3.1]

>>> start, stop, n = 1, 3.1, 7
>>> [((n-i)*start + i*stop)/n for i in range(n+1)]
[1.0, 1.3, 1.5999999999999999, 1.9000000000000001, 2.2, 2.5,
2.8000000000000003, 3.1]

>>>> start, stop, n = -1, 1.1, 7
>>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
> [-1.0, -0.7, -0.39999999999999997, -0.09999999999999996,
> 0.20000000000000004, 0.5000000000000001, 0.8, 1.1]

>>> start, stop, n = -1, 1.1, 7
>>> [((n-i)*start + i*stop)/n for i in range(n+1)]
[-1.0, -0.7000000000000001, -0.39999999999999997,
-0.09999999999999996, 0.20000000000000004, 0.5, 0.8, 1.1]

On these examples, using fractions is no better than what I suggested
in my previous post.

-- 
Arnaud


From stefan-usenet at bytereef.org  Sat Sep 24 16:30:45 2011
From: stefan-usenet at bytereef.org (Stefan Krah)
Date: Sat, 24 Sep 2011 22:30:45 +0200
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <CAJ6cK1Yi0LC7f1KZjPjmMCcDiOTKnhSUxAT8dsMu5nzGT9nr=A@mail.gmail.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<CAJ6cK1Yi0LC7f1KZjPjmMCcDiOTKnhSUxAT8dsMu5nzGT9nr=A@mail.gmail.com>
Message-ID: <20110924203045.GA2014@sleipnir.bytereef.org>

Arnaud Delobelle <arnodel at gmail.com> wrote:
> >>>> start, stop, n = -1, 1.1, 7
> >>>> [float(F(start) + i*(F(stop)-F(start))/n) for i in range(n+1)]
> > [-1.0, -0.7, -0.39999999999999997, -0.09999999999999996,
> > 0.20000000000000004, 0.5000000000000001, 0.8, 1.1]
> 
> >>> start, stop, n = -1, 1.1, 7
> >>> [((n-i)*start + i*stop)/n for i in range(n+1)]
> [-1.0, -0.7000000000000001, -0.39999999999999997,
> -0.09999999999999996, 0.20000000000000004, 0.5, 0.8, 1.1]
> 
> On these examples, using fractions is no better than what I suggested
> in my previous post.

Why not use Decimal if one needs exact endpoints? Something like:

def drange(start, stop, step=1):
    if (step == 0):
        raise ValueError("step must be != 0")
    with localcontext() as ctx:
        ctx.traps[Inexact] = True
        x = start
        cmp = -1 if step > 0 else 1
        while x.compare(stop) == cmp:
            yield float(x)
            x += step


>>> list(drange(Decimal(1), Decimal("3.1"), Decimal("0.3")))
[1.0, 1.3, 1.6, 1.9, 2.2, 2.5, 2.8]
>>> list(drange(Decimal(-1), Decimal("1.1"), Decimal("0.3")))
[-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8]
>>> list(drange(Decimal(-1), Decimal("1.1"), Decimal("0.1823612873")))
[-1.0, -0.8176387127, -0.6352774254, -0.4529161381, -0.2705548508, -0.0881935635, 0.0941677238, 0.2765290111, 0.4588902984, 0.6412515857, 0.823612873, 1.0059741603]
>>> list(drange(Decimal(-1), Decimal("1.1"), Decimal(1)/3))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 10, in drange
  File "/usr/lib/python3.2/decimal.py", line 1178, in __add__
    ans = ans._fix(context)
  File "/usr/lib/python3.2/decimal.py", line 1652, in _fix
    context._raise_error(Inexact)
  File "/usr/lib/python3.2/decimal.py", line 3836, in _raise_error
    raise error(explanation)
decimal.Inexact: None



Stefan Krah




From mateusz at loskot.net  Sat Sep 24 16:52:46 2011
From: mateusz at loskot.net (Mateusz Loskot)
Date: Sat, 24 Sep 2011 13:52:46 -0700 (PDT)
Subject: PyEval_EvalCodeEx return value
In-Reply-To: <3520ac5c-9e75-45b2-a4f1-fc29658bea4b@l4g2000vbv.googlegroups.com>
References: <4E786C42.3050309@loskot.net>
	<3520ac5c-9e75-45b2-a4f1-fc29658bea4b@l4g2000vbv.googlegroups.com>
Message-ID: <32503908.post@talk.nabble.com>



John Pinner-3 wrote:
> 
> I assume that you have read the documentation at
> http://docs.python.org/c-api/veryhigh.html,
> and I agree that it's sparse, but the entry for the next entry,
> PyEval_EvalCodeEx, tells you a little more, as does that for
> PyEval_EvalFrameEx.
> 

It does help, but only a bit.


John Pinner-3 wrote:
> 
> Obviously, it's returning a pointer to a PyObject, and Looking at the
> source code, that may be NULL, to throw an exception, or an execution
> frame, or a generator,etc, etc, depending on the code it's been given.
> I guess that you should be able to inspect the PyObject to see what it is.
> 

Yes, that's one possibility. I tried to investigate others.


John Pinner-3 wrote:
> 
> What I'm wondering is, why are you eval-ing code ? A favourite device
> of C programmers coming to Python (and mea culpa in the past), it's
> fraught with potential problems and even security risks, and is
> difficult to debug, and maybe you should be using introspection instead.
> 

My application accepts Python scripts from user and executes using embedded
Python interpreter.
So, I use this particular API.

Could you elaborate on the "using introspection"?


John Pinner-3 wrote:
> 
> And maybe you should be working in Python, and not C++ at this point,
> do the dynamic stuff in the language best suited, and then return to C++
> when needed.
> 

My application in C++ interacts with Python programs provided by users.
Depending on what these programs request, various PyObject objects are
created and returned back, etc.

I understand it's difficult to discuss it without long essays or without
providing the code, etc.
So, I can only discuss and investigate building blocks I use.
Anyway, thanks for your comments.

Best regards,

-----
-- 
Mateusz Loskot
http://mateusz.loskot.net
-- 
View this message in context: http://old.nabble.com/PyEval_EvalCodeEx-return-value-tp32501833p32503908.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From f.derainville at gmail.com  Sat Sep 24 16:54:16 2011
From: f.derainville at gmail.com (f.derainville at gmail.com)
Date: Sat, 24 Sep 2011 13:54:16 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <16897112.251.1316897656322.JavaMail.geo-discussion-forums@yqmw31>

>>> import numpy
>>> numpy.arange(0, 3, 0.3)
array([ 0. ,  0.3,  0.6,  0.9,  1.2,  1.5,  1.8,  2.1,  2.4,  2.7])


From rantingrick at gmail.com  Sat Sep 24 17:05:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 24 Sep 2011 14:05:36 -0700 (PDT)
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
Message-ID: <210c9d0b-d0f0-4fec-9d7b-11ef32127d6e@q26g2000vby.googlegroups.com>

On Sep 22, 4:14?pm, Matt <mattj.morri... at gmail.com> wrote:
> I'm curious about what people's opinions are about using mixins in
> Python. I really like, for example, the way that class based views
> were implemented in Django 1.3 using mixins. It makes everything
> extremely customizable and reusable. I think this is a very good
> practice to follow, however, in Python mixins are achieved by using
> (or perhaps misusing) inheritance and often multiple inheritance.

Have a look at this article also. Even though he uses java source code
anyone can follow along:

   http://berniesumption.com/software/inheritance-is-evil-and-must-be-destroyed/


From tim at akwebsoft.com  Sat Sep 24 17:09:35 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sat, 24 Sep 2011 13:09:35 -0800
Subject: Suggested coding style
In-Reply-To: <CAJ6cK1Y5UJPs3n8WmO2MEKUUR9uZWaa9bFjWAR4D1P3T3GhGsA@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<4E7E30CC.3040402@mrabarnett.plus.com>
	<CAJ6cK1Y5UJPs3n8WmO2MEKUUR9uZWaa9bFjWAR4D1P3T3GhGsA@mail.gmail.com>
Message-ID: <20110924210935.GI19422@johnsons-web.com>

* Arnaud Delobelle <arnodel at gmail.com> [110924 12:04]:
> On 24 September 2011 20:34, MRAB <python at mrabarnett.plus.com> wrote:
> 
> >>> In my brief coding experience I have stumbled upon Python zfill(width)
> >>> method,
> [...]
> >> ? It could be some sort of legacy. I imagine we will hear from some
> >> ? more senior pythonists on this matter.
> >>
> > The documentation says "New in version 2.2.2".
> 
> But zfill has been in the string module for a lot longer.
 :) Like I said. See timestamp.
 http://mail.python.org/pipermail/python-bugs-list/1999-July/000035.html
 I was coding C/C++ and ASM back then.... 

-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From tjreedy at udel.edu  Sat Sep 24 18:10:29 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 24 Sep 2011 18:10:29 -0400
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5lkgs$e4c$1@dough.gmane.org>

On 9/24/2011 9:53 AM, Steven D'Aprano wrote:
> I'm trying to generate a sequence of equally-spaced numbers between a lower
> and upper limit. Given arbitrary limits, what is the best way to generate a
> list of equally spaced floats with the least rounding error for each point?
>
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
>
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>
> and I'd like to return the values in the brackets. Using Decimal or Fraction
> is not an option, I must use floats. If the exact value isn't representable
> as a float, I'm okay with returning the nearest possible float.
>
> The width of each interval is:
>
> width = (2.1 - 0.0)/7

Calculating width is the fundamental problem. .3 cannot be exactly 
represented in binary, and higher multiples with multiply the error.

>
> The relevant points can be calculated in either of two methods:
>
> #1 add multiples of the width to the starting value, 0.
>
> #2 subtract multiples of width from the ending value, 2.1.
>
> (Repeated addition or subtraction should be avoided, as it increases the
> amount of rounding error.)
>
> Mathematically the two are equivalent, but due to rounding, they may not be.
> Here's a run using Python 3.2:
>
>>>> [0.0 + i*width for i in range(8)]
> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
>
> The 4th and 7th values have rounding errors, the rest are exact

No they are not. Their errors are just smaller and not visible with 16 
digits.

 >>> width = (2.1 - 0.0)/7
 >>> ['%20.18f' % x for x in [0.0 + i*width for i in range(8)]]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.899999999999999911', '1.199999999999999956', '1.500000000000000000', 
'1.799999999999999822', '2.100000000000000089']

On 9/24/2011 10:18 AM, Arnaud Delobelle wrote:
 >      ((n-i)*a + i*b)/n for i in range(n+1)

 >>> ['%20.18f' % x for x in [((7-i)*0.0 + i*2.1)/7 for i in range(8)]]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.900000000000000133', '1.199999999999999956', '1.500000000000000000', 
'1.800000000000000266', '2.100000000000000089']

In the two places where this disagrees with the previous result, I 
believe it is worse. The *0.0 adds nothing. You are still multiplying an 
inexactly represented 2.1 by increasingly large numbers. Even 7*2.1/7 is 
not exact!

My answer is the same as Mark's. Do exact calculation with fractions 
(whether using Fraction or not) and convert to float. I believe the 
least common multiple of a.as_integer_ratio[1], b.as_integer_ratio[1], 
and n is the common denominator needed to convert the numerators to a 
range() output. For the current problem, that is lcm(10,7) = 70.

The best you can do for this example is
 >>> ['%20.18f' % (i/10 ) for i in range(0, 22, 3)]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.900000000000000022', '1.199999999999999956', '1.500000000000000000', 
'1.800000000000000044', '2.100000000000000089']

Notice that the last place errors are all less than 50, so printing to 
16 places will make them appear 'exact'.

Without being fancy (to see than you can cancel 7), you get the same 
output with
 >>> ['%20.18f' % (i/70 ) for i in range(0, 148, 21)]
['0.000000000000000000', '0.299999999999999989', '0.599999999999999978', 
'0.900000000000000022', '1.199999999999999956', '1.500000000000000000', 
'1.800000000000000044', '2.100000000000000089']

In the two places where these disagree with the first (your original) 
they are *better*, with absolute error in the last places of 22 versus 
89 and 44 versus 178 for .9 and 1.8. The last place errors greater than 
50 gave you the 'inexact' answers in your post, and indeed, they are not 
the best possible.

-- 
Terry Jan Reedy



From rantingrick at gmail.com  Sat Sep 24 18:36:44 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 24 Sep 2011 15:36:44 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
Message-ID: <0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>

On Sep 23, 10:36?pm, Fletcher Johnson <flt.john... at gmail.com> wrote:
> The topic says it all:
> Why is shutil named shutil? What does it stand for? This is just a
> mild curiosity of mine.
> The shutil module for reference:http://docs.python.org/library/shutil.html#module-shutil

Because even after 20 freaking years of evolution Python "heads of
state" (or states of head) cannot be bi-partisan enough to agree on a
freaking File and/or path object; remind you of any "body" we know?


From rantingrick at gmail.com  Sat Sep 24 18:41:22 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 24 Sep 2011 15:41:22 -0700 (PDT)
Subject: Python Mixins
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
	<4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <3baeef0c-1dbf-4067-a73e-d6bfbc059f17@5g2000yqo.googlegroups.com>

On Sep 24, 3:57?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:

> class StandardTestMixin:
> ? ? def test_requires_one_argument(self):
> ? ? ? ? self.assertRaises(TypeError, self.func)
> ? ? def test_has_docstring(self):
> ? ? ? ? self.assertTrue(self.func.__doc__)

And this is another example of why we need doc-string reforms. Here we
have a well know "pythonista" (for lack of better word) who needs to
write a test for doc-string inclusion because he refuses to get in the
habit of writing them. People, EVERY method and function MUST have a
doc-string! What is the purpose of having doc-strings if we are too
lazy to use them!




From jesus.ramirez.utexas at gmail.com  Sat Sep 24 19:08:21 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Sat, 24 Sep 2011 16:08:21 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
Message-ID: <2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>


I installed it from here: http://www.python.org/getit/releases/2.5.6/

What do you think a solution might be?



From benjamin.kaplan at case.edu  Sat Sep 24 19:33:35 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 24 Sep 2011 19:33:35 -0400
Subject: Python 2.5 zlib trouble
In-Reply-To: <2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
Message-ID: <CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>

On Sat, Sep 24, 2011 at 7:08 PM, Jesramz <jesus.ramirez.utexas at gmail.com> wrote:
>
> I installed it from here: http://www.python.org/getit/releases/2.5.6/
>
> What do you think a solution might be?
>

There is no binary installer on that page. That means you downloaded
the source code and compiled it yourself. Yes, you didn't patch it.
But it's still a self-compiled version of Python.

In order to get zlib in a self-compiled version of Python, you need to
install the appropriate -dev package. From a quick look at the
repository, I think it's zlib1g-dev but I'm not sure.

On Ubuntu, the development headers are in a different package than the
libraries themselves. The development headers aren't needed when
you're installing a binary that someone else compiled (for instance,
anything you get from the package manager) but are needed if you're
trying to build anything that uses the library. Since a good chunk of
the Python stdlib isn't actually necessary to run Python, you can
successfully build Python without getting a good chunk of the modules.
./configure will give you a list of the modules that won't get built
at the end of its output.


From python.list at tim.thechases.com  Sat Sep 24 19:36:56 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Sat, 24 Sep 2011 18:36:56 -0500
Subject: Python Mixins
In-Reply-To: <3baeef0c-1dbf-4067-a73e-d6bfbc059f17@5g2000yqo.googlegroups.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>	<4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
	<3baeef0c-1dbf-4067-a73e-d6bfbc059f17@5g2000yqo.googlegroups.com>
Message-ID: <4E7E6998.80102@tim.thechases.com>

On 09/24/11 17:41, rantingrick wrote:
> On Sep 24, 3:57 am, Steven D'Aprano<steve
> +comp.lang.pyt... at pearwood.info>  wrote:
>
>> class StandardTestMixin:
>>      def test_requires_one_argument(self):
>>          self.assertRaises(TypeError, self.func)
>>      def test_has_docstring(self):
>>          self.assertTrue(self.func.__doc__)
>
> And this is another example of why we need doc-string reforms. Here we
> have a well know "pythonista" (for lack of better word) who needs to
> write a test for doc-string inclusion because he refuses to get in the
> habit of writing them. People, EVERY method and function MUST have a
> doc-string! What is the purpose of having doc-strings if we are too
> lazy to use them!

http://www.python.org/dev/peps/pep-0257/

"""
The aim of this PEP is to standardize the high-level structure of 
docstrings: what they should contain, and how to say it (without 
touching on any markup syntax within docstrings). The PEP 
contains conventions, not laws or syntax.
"""

You keep saying the word "MUST".  I do not think it means what 
you think it means.  Just for the record [1], [2], [3], [4] all 
in my first page of search Google search results.  Pot, meet 
kettle.

-tkc

[1]
http://mail.python.org/pipermail/python-list/2009-September/1220068.html

[2]
http://mail.python.org/pipermail//python-list/2011-July/1276021.html

[3]
http://mail.python.org/pipermail/python-list/2010-March/1237898.html

[4]
http://mail.python.org/pipermail/python-list/2010-June/1246305.html


From tjreedy at udel.edu  Sat Sep 24 20:31:06 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 24 Sep 2011 20:31:06 -0400
Subject: Python Mixins
In-Reply-To: <4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
References: <b92958aa-b51b-4dd7-90cf-fdd86ff006e9@b28g2000yqa.googlegroups.com>
	<4e7d9b5e$0$29981$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5lsoh$o80$1@dough.gmane.org>

On 9/24/2011 4:57 AM, Steven D'Aprano wrote:

> Python says is that issubclass(Cat, Yamlafiable) will return True. The
> *interpretation* of that fact is entirely up to you. If you want to
> interpret it as meaning that cats are Yamlafiables, go right ahead. If you
> want to interpret it as a technical result with no semantic meaning, that's
> fine too. After all, just because "ram" in "programming" returns True
> doesn't actually mean anything about male sheep and computing.

Today's comics had a strip in which girl A suggests to girl B that they 
go to a disco to disco-ver someone interesting.

> In fact, even in real life, the ancestor/descendant metaphor creaks. What
> should we make of bacteria which exchange DNA with other species of
> bacteria?

That the human concept of 'species' does not really apply to bacteria.
And similarly, that the CompSci concept of 'class' may also not always 
fit what we want to model.

 > Which is the ancestor and which is the descendant? How about
> symbionts like lichen? What about when we splice genes from one species
> into another? So even in real life, there are multiple inheritance and
> mixins.

Good point.

-- 
Terry Jan Reedy



From tjreedy at udel.edu  Sat Sep 24 20:40:36 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 24 Sep 2011 20:40:36 -0400
Subject: Why is the shutil module called shutil?
In-Reply-To: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
Message-ID: <j5ltac$qut$1@dough.gmane.org>

On 9/23/2011 11:36 PM, Fletcher Johnson wrote:
> The topic says it all:
> Why is shutil named shutil? What does it stand for? This is just a
> mild curiosity of mine.
> The shutil module for reference: http://docs.python.org/library/shutil.html#module-shutil

I think it would be nice if the doc explained. Feel free to open a doc 
issue to add '(sh-ell util-ities)' or something after "The shutil " and 
add me, terry.reedy, as nosy.

-- 
Terry Jan Reedy



From lists at cheimes.de  Sat Sep 24 20:51:28 2011
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 25 Sep 2011 02:51:28 +0200
Subject: Python 2.5 zlib trouble
In-Reply-To: <CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>	<mailman.1405.1316812862.27778.python-list@python.org>	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>	<mailman.1427.1316876233.27778.python-list@python.org>	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
Message-ID: <j5ltuh$u34$1@dough.gmane.org>

Am 25.09.2011 01:33, schrieb Benjamin Kaplan:
> There is no binary installer on that page. That means you downloaded
> the source code and compiled it yourself. Yes, you didn't patch it.
> But it's still a self-compiled version of Python.
> 
> In order to get zlib in a self-compiled version of Python, you need to
> install the appropriate -dev package. From a quick look at the
> repository, I think it's zlib1g-dev but I'm not sure.
> 
> On Ubuntu, the development headers are in a different package than the
> libraries themselves. The development headers aren't needed when
> you're installing a binary that someone else compiled (for instance,
> anything you get from the package manager) but are needed if you're
> trying to build anything that uses the library. Since a good chunk of
> the Python stdlib isn't actually necessary to run Python, you can
> successfully build Python without getting a good chunk of the modules.
> ../configure will give you a list of the modules that won't get built
> at the end of its output.

On recent Ubuntu and Debian versions, the dev packages aren't enough for
old versions of Python. Anything older than Python 2.7.2 requires a
tweak in order to make Python find the shared libraries. It's all
explained in my blog posting.

Debian's new multiarch features has broken Python's main setup.py
because it tries to find the libraries itself instead of relying on
ld.so and gcc. Barry has already fixed the issue for 2.7.2 and recent 3.2.

Christian

PS: Linux 3.x is going to cause trouble with older versions of Python,
too. Wanna know more? Have a look: http://lipyrary.blogspot.com/



From steve+comp.lang.python at pearwood.info  Sat Sep 24 22:13:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 12:13:26 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1439.1316894136.27778.python-list@python.org>
Message-ID: <4e7e8e47$0$29966$c3e8da3$5496439d@news.astraweb.com>

Arnaud Delobelle wrote:

> On these examples, using fractions is no better than what I suggested
> in my previous post.

I'm sorry, I can't see your previous post. Perhaps it isn't available on my
news provider?



-- 
Steven



From steve+comp.lang.python at pearwood.info  Sat Sep 24 22:36:42 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 12:36:42 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
Message-ID: <4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>

MRAB wrote:

> On 24/09/2011 20:10, Tim Johnson wrote:
>> * Passiday<passiday at gmail.com>  [110924 09:47]:
>> <...>
>>> I have been coding in many other languages, most of the time it was
>>> Java and C#. I don't like the function mess of PHP (ie, loads and
>>> loads of functions without any namespaces etc), but I'd like to think
>>> that Python is different.
>>    It is ...
>>
>>> In my brief coding experience I have stumbled upon Python zfill(width)
>>> method, and I thought, really, do you have to include such a narrow-
>>> purpose method in the basic method set? Perhaps there are more such
>>> methods that are nice when you need them, but then again, you don't
>>> put all the possible methods in the standard set.
>>    I think that you have raised an interesting question here. I've
>>    been coding in python for 9 years and I have never used it.
>>
>>> Perhaps there is reason such method is in the basic library, and my
>>> complaints are unbased?
>>
>>    It could be some sort of legacy. I imagine we will hear from some
>>    more senior pythonists on this matter.
>>
> The documentation says "New in version 2.2.2".

Which is about nine years old, so roughly half as old as Python itself. 
It's hardly a new feature.

Just because Passiday and Tim don't use zfill doesn't mean it's not useful 
to some people. Here are examples of it in use, or people asking how to 
format numbers with leading zeroes:

http://www.ruby-forum.com/topic/67378
http://stackoverflow.com/questions/134934/display-number-with-leading-zeros
http://stackoverflow.com/questions/733454/best-way-to-format-integer-as-string-with-leading-zeros
http://msdn.microsoft.com/en-us/library/dd260048.aspx
http://www.ozgrid.com/forum/showthread.php?t=64193&page=1

http://www.google.com/codesearch#algXCqBNNP0/utils/zip2rep.py&q=lang:%5Epython$%20zfill%20case:yes&ct=rc&cd=7

http://www.google.com/codesearch#Wnd3W7C0RPM/lives_guide.tar.bz2%7C0MIk12cLwTg/desub.py&q=lang:%5Epython$%20zfill%20case:yes

Padding numbers with leading zeroes is very common. I'm surprised that 
more languages don't make it a string method.



-- 
Steven



From jeanpierreda at gmail.com  Sat Sep 24 22:55:10 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sat, 24 Sep 2011 22:55:10 -0400
Subject: Suggested coding style
In-Reply-To: <4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>

> Padding numbers with leading zeroes is very common. I'm surprised that
> more languages don't make it a string method.

By making it a string method, instead of a function, we force all
implementations of strings to implement that method. That sort of
sucks, and it's a reason not to include it as a method. It can, after
all, be implemented as a function, and in doing so (with the
appropriate operator overloading) that function could work with
multiple implementations of strings. Instead any implementation of a
string must implement that method. That's a waste.

Of course, one could argue that there are very few string
implementations. On the other hand, there were three in the stdlib in
2.x, and there are other concepts of strings (like ropes) that are
more efficient for different use-cases. The third string in the stdlib,
mmap, didn't even bother implementing the full string interface. It's
just so damned big. (Also some methods didn't apply, like zfill, but
hey!)

At the very least, it's sort of ugly from my perspective to tack on
trivial things like this to be string methods.

But sure, yeah, as a bonus you get to do fewer imports. That's pretty
great too, I guess.

Devin

On Sat, Sep 24, 2011 at 10:36 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> MRAB wrote:
>
>> On 24/09/2011 20:10, Tim Johnson wrote:
>>> * Passiday<passiday at gmail.com> ?[110924 09:47]:
>>> <...>
>>>> I have been coding in many other languages, most of the time it was
>>>> Java and C#. I don't like the function mess of PHP (ie, loads and
>>>> loads of functions without any namespaces etc), but I'd like to think
>>>> that Python is different.
>>> ? ?It is ...
>>>
>>>> In my brief coding experience I have stumbled upon Python zfill(width)
>>>> method, and I thought, really, do you have to include such a narrow-
>>>> purpose method in the basic method set? Perhaps there are more such
>>>> methods that are nice when you need them, but then again, you don't
>>>> put all the possible methods in the standard set.
>>> ? ?I think that you have raised an interesting question here. I've
>>> ? ?been coding in python for 9 years and I have never used it.
>>>
>>>> Perhaps there is reason such method is in the basic library, and my
>>>> complaints are unbased?
>>>
>>> ? ?It could be some sort of legacy. I imagine we will hear from some
>>> ? ?more senior pythonists on this matter.
>>>
>> The documentation says "New in version 2.2.2".
>
> Which is about nine years old, so roughly half as old as Python itself.
> It's hardly a new feature.
>
> Just because Passiday and Tim don't use zfill doesn't mean it's not useful
> to some people. Here are examples of it in use, or people asking how to
> format numbers with leading zeroes:
>
> http://www.ruby-forum.com/topic/67378
> http://stackoverflow.com/questions/134934/display-number-with-leading-zeros
> http://stackoverflow.com/questions/733454/best-way-to-format-integer-as-string-with-leading-zeros
> http://msdn.microsoft.com/en-us/library/dd260048.aspx
> http://www.ozgrid.com/forum/showthread.php?t=64193&page=1
>
> http://www.google.com/codesearch#algXCqBNNP0/utils/zip2rep.py&q=lang:%5Epython$%20zfill%20case:yes&ct=rc&cd=7
>
> http://www.google.com/codesearch#Wnd3W7C0RPM/lives_guide.tar.bz2%7C0MIk12cLwTg/desub.py&q=lang:%5Epython$%20zfill%20case:yes
>
> Padding numbers with leading zeroes is very common. I'm surprised that
> more languages don't make it a string method.
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From anacrolix at gmail.com  Sun Sep 25 00:56:15 2011
From: anacrolix at gmail.com (Matt Joiner)
Date: Sun, 25 Sep 2011 14:56:15 +1000
Subject: Why is the shutil module called shutil?
In-Reply-To: <0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
Message-ID: <CAB4yi1MRV1neeZqq-FVA9vX_wUzczD4w6H7eekmV_GUGV_zXzQ@mail.gmail.com>

Please continue

On Sun, Sep 25, 2011 at 8:36 AM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 23, 10:36?pm, Fletcher Johnson <flt.john... at gmail.com> wrote:
>> The topic says it all:
>> Why is shutil named shutil? What does it stand for? This is just a
>> mild curiosity of mine.
>> The shutil module for reference:http://docs.python.org/library/shutil.html#module-shutil
>
> Because even after 20 freaking years of evolution Python "heads of
> state" (or states of head) cannot be bi-partisan enough to agree on a
> freaking File and/or path object; remind you of any "body" we know?
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve+comp.lang.python at pearwood.info  Sun Sep 25 01:21:31 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 15:21:31 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1443.1316902249.27778.python-list@python.org>
Message-ID: <4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>

Terry Reedy wrote:

> On 9/24/2011 9:53 AM, Steven D'Aprano wrote:
[...]
>>>>> [0.0 + i*width for i in range(8)]
>> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
>>
>> The 4th and 7th values have rounding errors, the rest are exact
> 
> No they are not. Their errors are just smaller and not visible with 16
> digits.

Pardon. I meant that they were as close to exact as is possible in binary
floats. With the exception of 0.8999... and 1.7999... I don't believe any
other float can be closer to the exact value.

I did mention that "If the exact value isn't representable as a float, I'm
okay with returning the nearest possible float." :)



-- 
Steven



From steve+comp.lang.python at pearwood.info  Sun Sep 25 01:31:14 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 15:31:14 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1429.1316884776.27778.python-list@python.org>
Message-ID: <4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> On Sun, Sep 25, 2011 at 3:01 AM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> Mark Dickinson wrote:
>>
>>> Using Fraction for intermediate calculations actually works perfectly
>>> for this, since conversions from float to Fraction are exact, while
>>> conversions from Fraction to float are correctly rounded. ?So if
>>> you're using Python, you're not too bothered about efficiency, and you
>>> want provably correctly-rounded results, why not use Fraction?
>>>
>> Ah, I knew it was too easy!
> 
> Try using Fraction for the start and stop too:

If you look again at the code I used, I did. I just did it inside the list
comp. 


>>>> from fractions import Fraction as F
>>>> start,stop,n = F(0),F(21,10),7
>>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
> [0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
> [-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8, 1.1]


Something looks a tad suspicious here... the two list comps are identical,
but give completely different results, even though you don't re-assign
start and stop between calls. You're not editing your results are you?
<wink>

But seriously, you were freaking me out there for a bit. I couldn't see why
pulling the conversion to fraction outside of the list comp was giving
different results. And then it hit me...

>>> 2.1 == F(21, 10)
False

You're testing different numbers from me. Try again with F(2.1) as the stop
value.



-- 
Steven



From ladasky at my-deja.com  Sun Sep 25 01:38:14 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Sat, 24 Sep 2011 22:38:14 -0700 (PDT)
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <f432139d-8061-434a-a66e-d172d2e7ec12@db5g2000vbb.googlegroups.com>

On Sep 24, 6:53?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> I'm trying to generate a sequence of equally-spaced numbers between a lower
> and upper limit. Given arbitrary limits, what is the best way to generate a
> list of equally spaced floats with the least rounding error for each point?
>
> For example, suppose I want to divide the range 0 to 2.1 into 7 equal
> intervals, then the end-points of each interval are:
>
> (0.0)---(0.3)---(0.6)---(0.9)---(1.2)---(1.5)---(1.8)---(2.1)
>
> and I'd like to return the values in the brackets. Using Decimal or Fraction
> is not an option, I must use floats. If the exact value isn't representable
> as a float, I'm okay with returning the nearest possible float.

Use numpy.

>>> from numpy import mgrid
>>> seq = mgrid[0.0:2.1:8j]
>>> seq

array([ 0. ,  0.3,  0.6,  0.9,  1.2,  1.5,  1.8,  2.1])

>>> for x in seq:
	print repr(x)

0.0
0.29999999999999999
0.59999999999999998
0.89999999999999991
1.2
1.5
1.7999999999999998
2.1000000000000001



From rosuav at gmail.com  Sun Sep 25 02:02:47 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 16:02:47 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1429.1316884776.27778.python-list@python.org>
	<4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmpUiGiTuPX4eWe9TTWvBae7c2QKn1z0QYk8_rrEcHcY7A@mail.gmail.com>

On Sun, Sep 25, 2011 at 3:31 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:>> If you look again at
the code I used, I did. I just did it inside the list> comp.
You did, but you created a Fraction from a float; my version used
Fraction(21,10) instead of (effectively) Fraction(2.1). My description
was a little sloppy, but what I meant was to use Fraction for the
actual arguments to the "function" that this is implementing.
> Something looks a tad suspicious here... the two list comps are identical,
> but give completely different results, even though you don't re-assign
> start and stop between calls. You're not editing your results are you?
> <wink>

Whooops! I had a whole lot of other commands in the scrollback
(displaying intermediate results and such), and elided the rather
crucial reassignment of parameters along with them!

Fortunately, thanks to my reiplophobia, I still have the original
session up in IDLE. This is even the most recent thing in it.

>>> sys.version
'3.2 (r32:88445, Feb 20 2011, 21:29:02) [MSC v.1500 32 bit (Intel)]'
>>> from fractions import Fraction as F
>>> start,stop,n = F(0),F(21,10),7
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1]
>>> start, stop, n = F(-1), F(11,10), 7
>>> [float(start+i*(stop-start)/n) for i in range(n+1)]
[-1.0, -0.7, -0.4, -0.1, 0.2, 0.5, 0.8, 1.1]

There, now it's honest. Sorry about that!!

ChrisA


From tjreedy at udel.edu  Sun Sep 25 02:07:25 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 25 Sep 2011 02:07:25 -0400
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1443.1316902249.27778.python-list@python.org>
	<4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5mget$57s$1@dough.gmane.org>

On 9/25/2011 1:21 AM, Steven D'Aprano wrote:
> Terry Reedy wrote:
>
>> On 9/24/2011 9:53 AM, Steven D'Aprano wrote:
> [...]
>>>>>> [0.0 + i*width for i in range(8)]
>>> [0.0, 0.3, 0.6, 0.8999999999999999, 1.2, 1.5, 1.7999999999999998, 2.1]
>>>
>>> The 4th and 7th values have rounding errors, the rest are exact
>>
>> No they are not. Their errors are just smaller and not visible with 16
>> digits.
>
> Pardon. I meant that they were as close to exact as is possible in binary
> floats. With the exception of 0.8999... and 1.7999... I don't believe any
> other float can be closer to the exact value.
>
> I did mention that "If the exact value isn't representable as a float, I'm
> okay with returning the nearest possible float." :)

I do hope you did not stop with my lead-in sentence, and read to the 
end, where I gave you most of the answer you were looking for, without 
using the fractions module.

-- 
Terry Jan Reedy



From rosuav at gmail.com  Sun Sep 25 02:09:01 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sun, 25 Sep 2011 16:09:01 +1000
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<9ccee36b-e50a-4d24-92c6-d66a9c9fe12e@8g2000yqm.googlegroups.com>
	<4e7e0cfd$0$29992$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1429.1316884776.27778.python-list@python.org>
	<4e7ebca3$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmqEF69Ss0suHtF54Z4PnyWOw6b6SwPOGGcvAGNptMPdiQ@mail.gmail.com>

On Sun, Sep 25, 2011 at 3:31 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
>>>> 2.1 == F(21, 10)
> False
>

Ahh, but that may just mean that Fraction doesn't implement an == that
compares with floats.

>>> 2.1==float(F(21,10))
True

This may be because one oughtn't to use == with floats anyway.

>>> F(2.1)==F(21,10)
False
>>> F(2.1)
Fraction(4728779608739021, 2251799813685248)

That denominator is a power of 2 (2**51 as it happens), which is
unsurprising for something created from an IEEE floating point value.
Rounding F(21,10) off to fit into float produces this same value.

ChrisA


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Subject: TOP 15 HOT BOLLYWOOD KISSES
Message-ID: <31d837d8-5274-4b9a-a1e8-f11cfc7779b1@i9g2000yqe.googlegroups.com>


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From arnodel at gmail.com  Sun Sep 25 03:36:23 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sun, 25 Sep 2011 08:36:23 +0100
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <j5lkgs$e4c$1@dough.gmane.org>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<j5lkgs$e4c$1@dough.gmane.org>
Message-ID: <CAJ6cK1YCoqL+T1mp1RNuzuGO6UGLPN5fp065_UHugZSJ19J4xg@mail.gmail.com>

On 24 September 2011 23:10, Terry Reedy <tjreedy at udel.edu> wrote:

> On 9/24/2011 10:18 AM, Arnaud Delobelle wrote:
>> ? ? ?((n-i)*a + i*b)/n for i in range(n+1)
>
>>>> ['%20.18f' % x for x in [((7-i)*0.0 + i*2.1)/7 for i in range(8)]]
> ['0.000000000000000000', '0.299999999999999989', '0.599999999999999978',
> '0.900000000000000133', '1.199999999999999956', '1.500000000000000000',
> '1.800000000000000266', '2.100000000000000089']
>
> In the two places where this disagrees with the previous result, I believe
> it is worse. The *0.0 adds nothing. You are still multiplying an inexactly
> represented 2.1 by increasingly large numbers. Even 7*2.1/7 is not exact!

Of course *0.0 adds nothing in this case.  I was suggesting a general
solution to the problem of partitioning the interval (a, b) into n
subintervals of equal length.  As for 7*2.1/7 it is exactly the same
as 21/10 to 18 decimal places as the output of your own solution shows
below.

[...]
> The best you can do for this example is
>>>> ['%20.18f' % (i/10 ) for i in range(0, 22, 3)]
> ['0.000000000000000000', '0.299999999999999989', '0.599999999999999978',
> '0.900000000000000022', '1.199999999999999956', '1.500000000000000000',
> '1.800000000000000044', '2.100000000000000089']

Can you give an implementation for any interval (a, b) where a, b are
floats and any partition size n where n is a positive int?

My suggestion was a simple answer which tries to avoid the obvious
pitfalls that the naive approaches may fall into, as shown

>>> def bary(start, stop, n):
...     return [((n-i)*start + i*stop)/n for i in range(n+1)]
...
>>> def width(start, stop, n):
...     width = stop - start
...     return [start + i*width/n for i in range(n+1)]
...

Here is where the 'width' approach will fail:

>>> width(-1.0, 1e-20, 4)
[-1.0, -0.75, -0.5, -0.25, 0.0]
>>> bary(-1.0, 1e-20, 4)
[-1.0, -0.75, -0.5, -0.25, 1e-20]

-- 
Arnaud


From steve+comp.lang.python at pearwood.info  Sun Sep 25 05:30:03 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Sun, 25 Sep 2011 19:30:03 +1000
Subject: Generating equally-spaced floats with least rounding error
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1443.1316902249.27778.python-list@python.org>
	<4e7eba5c$0$30000$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1452.1316930857.27778.python-list@python.org>
Message-ID: <4e7ef49b$0$29987$c3e8da3$5496439d@news.astraweb.com>

Terry Reedy wrote:

> I do hope you did not stop with my lead-in sentence, and read to the
> end, where I gave you most of the answer you were looking for, without
> using the fractions module.

Yes, I read your entire post, thank you, and for my purposes I'm happy with
the fractions module.


-- 
Steven



From t.omahony.dublin at gmail.com  Sun Sep 25 08:31:50 2011
From: t.omahony.dublin at gmail.com (Timmy O'Mahony)
Date: Sun, 25 Sep 2011 05:31:50 -0700 (PDT)
Subject: Inexplicable Urllib2 problem between virtualenv's when POSTing to a
	Tomcat server
Message-ID: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>

Hey, I have a question on Stackoverflow at the moment that I thought I would put up here as it might get some more eyes (It has a bounty so feel free to answer there if you have a SO account!)

----

I have some test code (as a part of a webapp) that uses urllib2 to perform an operation I would usually perform via a browser:

- Log in to a remote website (this works)
- Move to another page (this works)
- Perform a POST by filling in a form (read on ...!)

I've created 4 separate, clean virtualenvs (with --no-site-packages) on 3 different machines, all with different versions of python but the exact same packages (via pip requirements file), and the code only works on the two virtualenvs on my local development machine(2.6.1 and 2.7.2) - it won't work on either of my production VPSs :(

In the failing cases, I can log in successfully, move to the correct page but when I submit the form, the remote server replies telling me that there has been an error - it's an application server error page ('we couldn't complete your request') and not a webserver error. 

- because I can successfully log in and maneuver to a second page, this doesn't seem to be a session or a cookie problem - it's particular to the final POST

- because I can perform the operation on a particular machine with the EXACT same headers and data, this doesn't seem to be a problem with what I am requesting/posting

- because I am trying the code on two separate VPS rented from different companies, this doesn't seem to be a problem with the VPS physical environment

- because the code works on 2 different python versions, I can't imagine it being an incompabilty problem
I'm completely lost at this stage as to why this wouldn't work. I've even 'turned-it-off-and-turn-it-on-again' because I just can't see what the problem could be.

I've tried everything I can think of to get this working. I've been through all of the headers of the requests & responses and they are all the same between machines.

The server I am trying to contact is a Tomcat server. It gives me a cookie called JSESSIONID and it also requires an apache.struct.token in the POST data which I am succesfully extracting with BeautifulSoup/lxml. Again, this works on 2 machines, so I don't think it's an ommision on my behalf, I think it's a compatibility or an encoding error. 

Any ideas welcome!





From eaglebalti at gmail.com  Sun Sep 25 09:47:43 2011
From: eaglebalti at gmail.com (Ashraf Ali)
Date: Sun, 25 Sep 2011 06:47:43 -0700 (PDT)
Subject: Information About Bollywood Famous Actresses Just For You
Message-ID: <353fde50-2433-4cae-84b0-73b36871c95d@q26g2000vby.googlegroups.com>

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From jeanpierreda at gmail.com  Sun Sep 25 11:53:59 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 11:53:59 -0400
Subject: Inexplicable Urllib2 problem between virtualenv's when POSTing to
	a Tomcat server
In-Reply-To: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
References: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
Message-ID: <CABicbJKbivRzi6RyFH7eAz3z_H6N7UvBDw--uCy-FAV5vTLjTA@mail.gmail.com>

It might help to give more information about the machines. In
particular, what versions of Python are on the production machines?

Devin

On Sun, Sep 25, 2011 at 8:31 AM, Timmy O'Mahony
<t.omahony.dublin at gmail.com> wrote:
> Hey, I have a question on Stackoverflow at the moment that I thought I would put up here as it might get some more eyes (It has a bounty so feel free to answer there if you have a SO account!)
>
> ----
>
> I have some test code (as a part of a webapp) that uses urllib2 to perform an operation I would usually perform via a browser:
>
> - Log in to a remote website (this works)
> - Move to another page (this works)
> - Perform a POST by filling in a form (read on ...!)
>
> I've created 4 separate, clean virtualenvs (with --no-site-packages) on 3 different machines, all with different versions of python but the exact same packages (via pip requirements file), and the code only works on the two virtualenvs on my local development machine(2.6.1 and 2.7.2) - it won't work on either of my production VPSs :(
>
> In the failing cases, I can log in successfully, move to the correct page but when I submit the form, the remote server replies telling me that there has been an error - it's an application server error page ('we couldn't complete your request') and not a webserver error.
>
> - because I can successfully log in and maneuver to a second page, this doesn't seem to be a session or a cookie problem - it's particular to the final POST
>
> - because I can perform the operation on a particular machine with the EXACT same headers and data, this doesn't seem to be a problem with what I am requesting/posting
>
> - because I am trying the code on two separate VPS rented from different companies, this doesn't seem to be a problem with the VPS physical environment
>
> - because the code works on 2 different python versions, I can't imagine it being an incompabilty problem
> I'm completely lost at this stage as to why this wouldn't work. I've even 'turned-it-off-and-turn-it-on-again' because I just can't see what the problem could be.
>
> I've tried everything I can think of to get this working. I've been through all of the headers of the requests & responses and they are all the same between machines.
>
> The server I am trying to contact is a Tomcat server. It gives me a cookie called JSESSIONID and it also requires an apache.struct.token in the POST data which I am succesfully extracting with BeautifulSoup/lxml. Again, this works on 2 machines, so I don't think it's an ommision on my behalf, I think it's a compatibility or an encoding error.
>
> Any ideas welcome!
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From t.omahony.dublin at gmail.com  Sun Sep 25 12:48:22 2011
From: t.omahony.dublin at gmail.com (Timmy O'Mahony)
Date: Sun, 25 Sep 2011 09:48:22 -0700 (PDT)
Subject: Inexplicable Urllib2 problem between virtualenv's when POSTing to
	a Tomcat server
In-Reply-To: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
References: <27195078.132.1316953910769.JavaMail.geo-discussion-forums@yqgn17>
Message-ID: <21653630.520.1316969302334.JavaMail.geo-discussion-forums@yqjw35>

Good point.

The two machines that the code works with are running python 2.6.1 and 2.7.2 and are running on my Mac (Snow Leopard)

The two non-working machines are running python 2.6.6 and 2.7.1 and are on Debian 6 and Debian 5 respectively. They are VPSs managed by different providers.

All of the installs are on separate virtuaenvs. 


From tim at akwebsoft.com  Sun Sep 25 14:46:14 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sun, 25 Sep 2011 10:46:14 -0800
Subject: Suggested coding style
In-Reply-To: <CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
Message-ID: <20110925184614.GK19422@johnsons-web.com>

* Devin Jeanpierre <jeanpierreda at gmail.com> [110924 19:07]:
> > Padding numbers with leading zeroes is very common. I'm surprised that
> > more languages don't make it a string method.
> 
> By making it a string method, instead of a function, we force all
> implementations of strings to implement that method. That sort of
> sucks, and it's a reason not to include it as a method. 
  Why does it suck? And why do people say 'suck' so much, especially
  in technical venues?
  :) Just answer the first question, the second is rhetorical. I
  think that your answer, regardless of whether I agree with it may
  edify me serendipitously.

> It can, after all, be implemented as a function, and in doing so
> (with the appropriate operator overloading) that function could
> work with multiple implementations of strings. Instead any
> implementation of a string must implement that method. That's a
> waste.
 I'm not sure what you mean. I've written my own `split' function. I
 don't believe that there would be any conflict if you wrote your
 own `zfill' function. Or if there would be, I'd want to know before
 I hurt myself.

 regards
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From petite.abeille at gmail.com  Sun Sep 25 14:54:28 2011
From: petite.abeille at gmail.com (Petite Abeille)
Date: Sun, 25 Sep 2011 20:54:28 +0200
Subject: Suggested coding style
In-Reply-To: <20110925184614.GK19422@johnsons-web.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
Message-ID: <53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>


On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:

>  Why does it suck? And why do people say 'suck' so much, especially in technical venues? :) 

It's a technical term:

http://www.osnews.com/images/comics/wtfm.jpg



From rantingrick at gmail.com  Sun Sep 25 16:30:41 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 25 Sep 2011 13:30:41 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
Message-ID: <683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>

On Sep 24, 11:56?pm, Matt Joiner <anacro... at gmail.com> wrote:
> Please continue

Well specifically we should have a look over the Ruby API's of "File",
"Dir", and "IO". I don't believe we should copy them verbatim --as the
Ruby API is not Pythonic-- however, it may be a good starting point
for something that has been decades overdue within this community.

There was the rejected Path object from PEP 355:
    http://www.python.org/dev/peps/pep-0355/

But it seems the "Anointed One" tossed the idea due to it's
"versatility" and it being a subclass of string... is he joking? o_O

First of all, what the hell is wrong with versatility Mr Van Rossum?
Where else would you put these methods? True it may be a large
collection, however, can YOU offer any suggestions as to where else we
would put them or are YOU just going to latch on to your prejudices of
path objects like your irrational fears of functional programming? Do
you remember the map and lambda fiasco?

We need you to get on board and push something through. When you hide
your head in the sand and imagine everything is "peachy cream" you
expose your backside for a swift kicking.

[References:]

Ruby File Object:
     http://www.ruby-doc.org/core/classes/File.html

Ruby Dir Object:
    http://ruby-doc.org/core/classes/Dir.html

Ruby IO Object:
    http://www.ruby-doc.org/core/classes/IO.html


From rosuav at gmail.com  Sun Sep 25 17:48:29 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 26 Sep 2011 07:48:29 +1000
Subject: Suggested coding style
In-Reply-To: <53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
Message-ID: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 4:54 AM, Petite Abeille
<petite.abeille at gmail.com> wrote:
>
> On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:
>
>> ?Why does it suck? And why do people say 'suck' so much, especially in technical venues? :)
>
> It's a technical term:
>
> http://www.osnews.com/images/comics/wtfm.jpg

Also, because technical people are opinionated windbags. Goes with the
territory. :) Actually, it's partly because it's so easy to create
standards. You don't like X? Create your own language in which it
doesn't exist! You absolutely detest Y? Ignore it and use something
else! But since we can't ignore _everything_ we dislike, there ends up
a happy medium in which we all use the things that we dislike least,
all the while ranting about those aspects of them that "absolutely,
totally suck", and vowing that we could have done way better if we'd
been in the position of Some Famous Guy back when he had that perfect
opportunity to create a new and perfect standard, but he *blew it* by
having a small and narrow view, etc, etc, etc...

Of course, some of us manage to still be courteous and objective when
discussing the things that suck, while others just go off on lengthy
rants. And if you're willing to learn, it's not uncommon to start off
complaining and end up appreciating. :)

Chris Angelico


From jeanpierreda at gmail.com  Sun Sep 25 17:52:35 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 17:52:35 -0400
Subject: Why is the shutil module called shutil?
In-Reply-To: <683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
Message-ID: <CABicbJ+Q0_0qsVXViE2Li4KM82_6a+gUmzeDx+tWdFHEREr-_Q@mail.gmail.com>

> Well specifically we should have a look over the Ruby API's of "File",
> "Dir", and "IO". I don't believe we should copy them verbatim --as the
> Ruby API is not Pythonic-- however, it may be a good starting point
> for something that has been decades overdue within this community.

Perhaps you would be interested in one of the recent threads on Python-Ideas.

http://mail.python.org/pipermail/python-ideas/2011-September/011559.html

Also please stop being abrasive and personally attacking other members
of the Python community.

Devin

On Sun, Sep 25, 2011 at 4:30 PM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 24, 11:56?pm, Matt Joiner <anacro... at gmail.com> wrote:
>> Please continue
>
> Well specifically we should have a look over the Ruby API's of "File",
> "Dir", and "IO". I don't believe we should copy them verbatim --as the
> Ruby API is not Pythonic-- however, it may be a good starting point
> for something that has been decades overdue within this community.
>
> There was the rejected Path object from PEP 355:
> ? ?http://www.python.org/dev/peps/pep-0355/
>
> But it seems the "Anointed One" tossed the idea due to it's
> "versatility" and it being a subclass of string... is he joking? o_O
>
> First of all, what the hell is wrong with versatility Mr Van Rossum?
> Where else would you put these methods? True it may be a large
> collection, however, can YOU offer any suggestions as to where else we
> would put them or are YOU just going to latch on to your prejudices of
> path objects like your irrational fears of functional programming? Do
> you remember the map and lambda fiasco?
>
> We need you to get on board and push something through. When you hide
> your head in the sand and imagine everything is "peachy cream" you
> expose your backside for a swift kicking.
>
> [References:]
>
> Ruby File Object:
> ? ? http://www.ruby-doc.org/core/classes/File.html
>
> Ruby Dir Object:
> ? ?http://ruby-doc.org/core/classes/Dir.html
>
> Ruby IO Object:
> ? ?http://www.ruby-doc.org/core/classes/IO.html
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From arnodel at gmail.com  Sun Sep 25 18:39:47 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Sun, 25 Sep 2011 23:39:47 +0100
Subject: Suggested coding style
In-Reply-To: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
Message-ID: <CAJ6cK1bENYJ9LhwXPiDVArn2pbCON4ngA3GvWpTmRd6hd6h=Nw@mail.gmail.com>

On Sep 25, 2011 10:49 PM, "Chris Angelico" <rosuav at gmail.com> wrote:
> And if you're willing to learn, it's not uncommon to start off
> complaining and end up appreciating. :)

+1 QOTW

-- 
Arnaud
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From rantingrick at gmail.com  Sun Sep 25 18:50:17 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 25 Sep 2011 15:50:17 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
Message-ID: <fd4f32a2-57ed-4b34-95d8-1575d0ad2c5e@t11g2000yqk.googlegroups.com>

Here is a *very* rough outline of my ideas. There are probably a few
mistakes in there. I've decided on three main main objects. A File
object, a Path object, and a Dir object.


## START ENLIGHTENMENT ##

class Path:
    def __init__(self, path):
    #
    # Properties about the path:
    drive => str
    directory => str
    filename => str
    extension => str
    uncshare[1]=> ???
    #
    # Mutations.
    def coerce(self) => File or Dir
    def normalize(self): => ip or Path? #normcase/normpath
    def expand_user(self): => ip or Path?
    def expand_vars(self): => ip or Path?
    def absolute(self) => ip or Path? #realpath/abspath
    def strip(self) => ip => remove one extension.
    def chmod(self, mode) => None
    def chown(self, uid, gid) => None [1]
    def rename(self, newname) => None
    def access(self, mode): => None #access
    def chroot(self) => None
    #
    # Introspection.
    def is_valid(self): # exists
    def is_absolute(self): #isabs
    def is_directory(self): #isdir
    def is_file(self): #isfile
    def is_link(self): #islnk
    def is_mount(self): #ismount
    def is_identical(self, other): #issamefile
    def time_accessed(self): #atime
    def time_modified(self): #mtime
    def time_changed(self): #ctime
##    def utime(self, times) => None
    #
    # Inspection.
    def info_stat(self): #stat
    def info_lstat(self): #lstat
    def info_statvfs(self): #statvfs
    #
    # Extraction.
    def basename(self): => str
        #Do we need basename when properties exist?
    def partition(self) => (drive, path, filename, extension)
        #Do we need partition when properties exist?
    def splitunc(self): ???
    def splitall(self): ???
    def relpathto(self, dest): => ???
    def pathconf(self, name): #pathconfig
    #
    # Modifying operations on links
    def link(self, newpath): ...
    def symlink(self, newlink): ...
    def readlink(self): ...
    def readlinkabs(self): ...

class File:
    def new(path)
    (...All existing file methods here...)
    #
    # Mutate, Clone, Destroy.
    def rename(self, newname) => ip or File?
    def delete(self, overwrites=3) => None
    def copy(self, dst) => File
    def unlink(self) => None    #
    #
    # Attribute mutation.
    def update(self) => None #touch
    def copy_mode(src) => None #copymode
    def copy_stat(src) => None #copystat
    def update_mode(dst) => None
    def update_stat(dst) => None
    #
    # Other
    def bytes(self): => int => 1292894
    def size(self, fmtstr="{0:0.2f}") => str => "1.23 MB"
    def backup(self) => filename.bak{count}


class Dir:
    def new(path)
    def open(path)
    #
    # Mutate, Clone, Destroy.
    def delete(self, onerror=None): => None
    def copy(self, dst, symlinks=True): => Dir
    #
    # Introspection.
    def get_paths(self, pattern=None): [Path, Path, ...]
    def get_dirs(self, pattern=None): => [Dir, Dir, ...]
    def get_files(self, pattern=None): => [File, File, ...]
    #
    def walk_paths(self, pattern=None): itereach->PathObj
    def walk_dirs(self, pattern=None): itereach->DirObj
    def walk_files(self, pattern=None): itereach->FileObj
    #
    def match(self, pattern) => bool
    def glob(self, pattern): => [Path, Path, ...]

    #######################################
    # Not sure what to do with these yet.
    #######################################
    def startfile(self)
        # startfile should part of os anyway.

## END ENLIGHTENMENT ##



From rantingrick at gmail.com  Sun Sep 25 19:50:13 2011
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 25 Sep 2011 16:50:13 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
	<fd4f32a2-57ed-4b34-95d8-1575d0ad2c5e@t11g2000yqk.googlegroups.com>
Message-ID: <605ac6e9-0a83-4658-9240-8889980b1862@8g2000yqm.googlegroups.com>

Oh the creative juices are flowing now!!!



class Path:
    def __init__(self, path):
    def __coerce__(self) => File or Dir
    #
    # Properties about the path:
    drive => str
    directory => str
    filename => str
    extension => str
##    uncshare[1]=> ???
    #
    # Mutations.
    def expand_user(self): => ip or Path?
    def expand_vars(self): => ip or Path?
    def to_normpath(self): => ip #normcase/normpath
    def to_abspath(self) => ip #realpath/abspath
    def set_access(self, mode) => None
    def set_owner(self, uid, gid) => None
    def set_root(self, path) => None
    #
    # Introspection.
    def is_accessable(self, mode) => bool #access
    def is_valid(self) => bool # exists
    def is_absolute(self) => bool #isabs
    def is_directory(self) => bool #isdir
    def is_file(self) => bool #isfile
    def is_link(self) => bool #islnk
    def is_mount(self) => bool #ismount
    def is_same(self, path_Dir_or_File) => bool #issamefile
    #
    # Inspection, Extraction
    def get_abspath(self)=> Path
    def get_normpath(self) => Path
##    def get_atime(self) => str #atime
##    def get_mtime(self) => str #mtime
##    def get_ctime(self) => str #ctime
    def get_stat(self) => stat #stat,lstat
##    def get_statvfs(self) => stat #statvfs
##        # do we really need this antiquity?

    ############################################################
    #                         Question                         #
    ############################################################
    # Should all the stat stuff like get_mtime, get_ctime,     #
    # get_atime, etc... be accessed only under get_stat? I     #
    # believe so!                                              #
    ############################################################

    def get_drive(self): => str
    def get_directory(self): => str
    def get_filename(self): => str (empty if is_dir)
    def get_extension(self): => str (empty if is_dir)
    #
    def split(self) => (drive, path, filename, extension)
##    def splitunc(self): ???
##    def splitall(self): ???
##    def relpathto(self, dest): => ???
##    def pathconf(self, name): #pathconfig
    #
    # Modifying operations on links
    def link_new(self, newpath, symbolic=False): ...
    def link_read(self): ...
    def link_readabs(self): ...


class File:
    def new(path)
    (...All existing file methods here...)
    #
    # Mutate, Clone, Destroy.
    def rename(self, newname) => ip or File?
    def delete(self, overwrites=3) => None
    def copy(self, dst) => File
    def unlink(self) => None    #
    #
    # Attribute mutation.
    def update(self) => None #touch
    def copy_mode(src) => None #copymode
    def copy_stat(src) => None #copystat
    def update_mode(dst) => None
    def update_stat(dst) => None
    #
    # Other
    def get_bytes(self): => int => 1292894
    def get_size(self, fmtstr="{0:0.2f}") => str => "1.23 MB"
    def backup(self) => filename.bak{count}


class Dir:
    def new(path)
    def open(path)
    #
    # Mutate, Clone, Destroy.
    def delete(self, onerror=None): => None
    def copy(self, dst, symlinks=True): => Dir
    #
    # Introspection.
    def get_paths(self, pattern=None): [Path, Path, ...]
    def get_dirs(self, pattern=None): => [Dir, Dir, ...]
    def get_files(self, pattern=None): => [File, File, ...]
    def walk_paths(self, pattern=None): itereach->PathObj
    def walk_dirs(self, pattern=None): itereach->DirObj
    def walk_files(self, pattern=None): itereach->FileObj

    ############################################################
    #                         Question                         #
    ############################################################
    # Do we really need "get_*" AND "walk_*"? I believe we     #
    # should choose one set of three                           #
    ############################################################

    def match(self, pattern) => bool
        # Do we need match when re would suffice?
    def glob(self, pattern): => [Path, Path, ...]

    ############################################################
    # Excommunicated Methods.
    ############################################################
    def startfile(self)
        # startfile should part of os anyway.



From jeanpierreda at gmail.com  Sun Sep 25 20:23:47 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 20:23:47 -0400
Subject: Suggested coding style
In-Reply-To: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
Message-ID: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>

>  Why does it suck?

The gist of what I was saying is that it's possible to define
functions that do this "generically" so that one implementation of
zfill can work with multiple implementations of strings. Having to
reimplement every time when one implementation would do is bothersome
and generally isn't done unless it has to be (thus why mmap lacks a
zfill method). Having to do more work than necessary "sucks", as does
having partial str implementations that don't do everything str does.

Ideally, I would claim that if some interface will have multiple
implementations, it should have as few methods as possible to make
implementation as easy as possible, and move as much as possible
_away_ from methods and into functions that work with arbitrary
implementations of the interface. This minimizes the amount of work
that must be done for implementors and thus makes life better.

It's also true that it's "bad practice" to have objects with large
APIs, not for convenience reasons but because it increases object
coupling, something that "good" object oriented design seeks to
eliminate. The idea there is that the less ways you can have your
object interacted with / interact with other objects, the easier it is
to think of the way state flows. I agree with this in principle, but
it doesn't really matter for strings.

The situation I see with something like zfill as-a-method is that it
has nearly negligible benefit (less imports vs function?) and some
detriment. So I would conclude it should not exist. Other people look
at this differently.

> Also, because technical people are opinionated windbags.

Pardon?

Devin

On Sun, Sep 25, 2011 at 5:48 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Mon, Sep 26, 2011 at 4:54 AM, Petite Abeille
> <petite.abeille at gmail.com> wrote:
>>
>> On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:
>>
>>> ?Why does it suck? And why do people say 'suck' so much, especially in technical venues? :)
>>
>> It's a technical term:
>>
>> http://www.osnews.com/images/comics/wtfm.jpg
>
> Also, because technical people are opinionated windbags. Goes with the
> territory. :) Actually, it's partly because it's so easy to create
> standards. You don't like X? Create your own language in which it
> doesn't exist! You absolutely detest Y? Ignore it and use something
> else! But since we can't ignore _everything_ we dislike, there ends up
> a happy medium in which we all use the things that we dislike least,
> all the while ranting about those aspects of them that "absolutely,
> totally suck", and vowing that we could have done way better if we'd
> been in the position of Some Famous Guy back when he had that perfect
> opportunity to create a new and perfect standard, but he *blew it* by
> having a small and narrow view, etc, etc, etc...
>
> Of course, some of us manage to still be courteous and objective when
> discussing the things that suck, while others just go off on lengthy
> rants. And if you're willing to learn, it's not uncommon to start off
> complaining and end up appreciating. :)
>
> Chris Angelico
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From python at mrabarnett.plus.com  Sun Sep 25 20:47:58 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 26 Sep 2011 01:47:58 +0100
Subject: Suggested coding style
In-Reply-To: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
Message-ID: <4E7FCBBE.4070806@mrabarnett.plus.com>

On 26/09/2011 01:23, Devin Jeanpierre wrote:
>>   Why does it suck?
>
> The gist of what I was saying is that it's possible to define
> functions that do this "generically" so that one implementation of
> zfill can work with multiple implementations of strings. Having to
> reimplement every time when one implementation would do is bothersome
> and generally isn't done unless it has to be (thus why mmap lacks a
> zfill method). Having to do more work than necessary "sucks", as does
> having partial str implementations that don't do everything str does.
>
> Ideally, I would claim that if some interface will have multiple
> implementations, it should have as few methods as possible to make
> implementation as easy as possible, and move as much as possible
> _away_ from methods and into functions that work with arbitrary
> implementations of the interface. This minimizes the amount of work
> that must be done for implementors and thus makes life better.
>
[snip]
I would have thought that a better solution would be to specify a
minimal set of methods in an abstract superclass and write the
additional methods using that minimal set.

The concrete string implementations would be descended from the
superclass and would still be able to override the additional methods
with more efficient code were desired, such as in the 'str' class.


From tjreedy at udel.edu  Sun Sep 25 20:58:57 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 25 Sep 2011 20:58:57 -0400
Subject: Generating equally-spaced floats with least rounding error
In-Reply-To: <CAJ6cK1YCoqL+T1mp1RNuzuGO6UGLPN5fp065_UHugZSJ19J4xg@mail.gmail.com>
References: <4e7de0d7$0$29975$c3e8da3$5496439d@news.astraweb.com>
	<j5lkgs$e4c$1@dough.gmane.org>
	<CAJ6cK1YCoqL+T1mp1RNuzuGO6UGLPN5fp065_UHugZSJ19J4xg@mail.gmail.com>
Message-ID: <j5oioj$4gh$1@dough.gmane.org>

On 9/25/2011 3:36 AM, Arnaud Delobelle wrote:
> On 24 September 2011 23:10, Terry Reedy<tjreedy at udel.edu>  wrote:

>> The best you can do for this example is
>>>>> ['%20.18f' % (i/10 ) for i in range(0, 22, 3)]
>> ['0.000000000000000000', '0.299999999999999989', '0.599999999999999978',
>> '0.900000000000000022', '1.199999999999999956', '1.500000000000000000',
>> '1.800000000000000044', '2.100000000000000089']
>
> Can you give an implementation for any interval (a, b) where a, b are
> floats and any partition size n where n is a positive int?

I was leaving that as an exercise for Stephen ;-)
but since he is satisfied with using Franctions ...
I accepted the challenge and (I believe) did it.

I first separated float-fractions conversions from generating equally 
spaced fractions. While this does not make much if any difference if and 
when one converts back to floats, testing with (21,10), for instance, as 
input is much easier than with (2.1).as_integer_ratio() ==
(4728779608739021, 2251799813685248). In some applications, small 
integer ratios are wanted anyway instead of floats. The main 
complication in the code is getting all outputs to have the smallest 
possible common denominator across the entire series.

#! python3 -- frange.py
# Copyright 2011 Terry Jan Reedy: use with acknowledgement
'''Generate n+1 equally spaced fractions or float given two endpoints
and the number n of intervals'''

from fractions import gcd

def floatrange(a, b, n):
     '''Yield floats a, b, and n-1 equally spaced floats in between.'''
     for num,dem in fracrange(a.as_integer_ratio(), 
b.as_integer_ratio(), n):
         yield num/dem

def fracrange(frac1, frac2, n):
     '''Yield fractions frac1, frac2 and n-1 equally spaced fractions in 
between.
     Fractions are represented as (numerator, denominator > 0)  pairs.
     For output, use the smallest common denominator of the inputs
     that makes the numerator range an even multiple of n.
     '''
     n1, d1 = frac1
     n2, d2 = frac2
     dem = d1 * d2 // gcd(d1, d2)
     start = n1 * (dem // d1)
     stop = n2 * (dem // d2)
     rang = stop - start
     q, r = divmod(rang, n)
     if r:
         gcd_r_n = gcd(r, n)
         m =  n // gcd_r_n
         dem *= m
         start *= m
         stop *= m
         step  = rang // gcd_r_n  # rang * m // n
     else:
         step = q   # if r==0: gcd(r,n)==n, m==1, rang//n == q
     for num in range(start, stop+1, step):
         yield num,dem

for (i,j), x  in zip(fracrange((0,1), (21,10), 7), floatrange(0.0, 2.1, 7)):
     print((i,j), '%20.18f' % (i/j ), '%20.18f' % x )
print()
for i,j in fracrange((1,10), (22,10), 7): print(i,j)
print()
for i,j in fracrange((1,5), (1,1), 6): print(i,j)

# output
(0, 10) 0.000000000000000000 0.000000000000000000
(3, 10) 0.299999999999999989 0.299999999999999989
(6, 10) 0.599999999999999978 0.599999999999999978
(9, 10) 0.900000000000000022 0.900000000000000022
(12, 10) 1.199999999999999956 1.199999999999999956
(15, 10) 1.500000000000000000 1.500000000000000000
(18, 10) 1.800000000000000044 1.800000000000000044
(21, 10) 2.100000000000000089 2.100000000000000089

1 10
4 10
7 10
10 10
13 10
16 10
19 10
22 10

3 15
5 15
7 15
9 15
11 15
13 15
15 15

-- 
Terry Jan Reedy



From jeanpierreda at gmail.com  Sun Sep 25 21:15:49 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Sun, 25 Sep 2011 21:15:49 -0400
Subject: Suggested coding style
In-Reply-To: <4E7FCBBE.4070806@mrabarnett.plus.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
	<4E7FCBBE.4070806@mrabarnett.plus.com>
Message-ID: <CABicbJLUFKvaTRg0UmiryqhXjeEULJqJKmH7yD-sECahUW_42Q@mail.gmail.com>

> I would have thought that a better solution would be to specify a
> minimal set of methods in an abstract superclass and write the
> additional methods using that minimal set.
>
> The concrete string implementations would be descended from the
> superclass and would still be able to override the additional methods
> with more efficient code were desired, such as in the 'str' class.

This does sound better to me too!

Devin

On Sun, Sep 25, 2011 at 8:47 PM, MRAB <python at mrabarnett.plus.com> wrote:
> On 26/09/2011 01:23, Devin Jeanpierre wrote:
>>>
>>> ?Why does it suck?
>>
>> The gist of what I was saying is that it's possible to define
>> functions that do this "generically" so that one implementation of
>> zfill can work with multiple implementations of strings. Having to
>> reimplement every time when one implementation would do is bothersome
>> and generally isn't done unless it has to be (thus why mmap lacks a
>> zfill method). Having to do more work than necessary "sucks", as does
>> having partial str implementations that don't do everything str does.
>>
>> Ideally, I would claim that if some interface will have multiple
>> implementations, it should have as few methods as possible to make
>> implementation as easy as possible, and move as much as possible
>> _away_ from methods and into functions that work with arbitrary
>> implementations of the interface. This minimizes the amount of work
>> that must be done for implementors and thus makes life better.
>>
> [snip]
> I would have thought that a better solution would be to specify a
> minimal set of methods in an abstract superclass and write the
> additional methods using that minimal set.
>
> The concrete string implementations would be descended from the
> superclass and would still be able to override the additional methods
> with more efficient code were desired, such as in the 'str' class.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rosuav at gmail.com  Sun Sep 25 21:42:55 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 26 Sep 2011 11:42:55 +1000
Subject: Suggested coding style
In-Reply-To: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
Message-ID: <CAPTjJmqe4snKL16bcmMm1DxMWGD5nUh+eiOQcAhtVdi5PZVfCg@mail.gmail.com>

On Mon, Sep 26, 2011 at 10:23 AM, Devin Jeanpierre
<jeanpierreda at gmail.com> wrote:
>> Also, because technical people are opinionated windbags.
>
> Pardon?

No offense intended; just look at this list and you'll see how
opinionated people can be, and how willing to express those opinions
in many words! Frank and courteous exchange of views, one of the best
ways to learn about the subject matter... and about the other
programmers too.

ChrisA


From tim at akwebsoft.com  Sun Sep 25 22:55:26 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sun, 25 Sep 2011 18:55:26 -0800
Subject: Suggested coding style
In-Reply-To: <CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<CABicbJLyikrcr3Jy5zJ9UnzUO0+QTCbYB983FTF-S+3U4OxK0Q@mail.gmail.com>
Message-ID: <20110926025526.GN19422@johnsons-web.com>

* Devin Jeanpierre <jeanpierreda at gmail.com> [110925 16:37]:
> >  Why does it suck?
> 
> The gist of what I was saying is that it's possible to define
> functions that do this "generically" so that one implementation of
> zfill can work with multiple implementations of strings. 

  That is kind of 'spot on' for me. Before I started using python, I
  worked in rebol - where (at that time), there was a limited number
  of function names available because of limited namespacing (and
  the binary was a fraction the size of python). So I learned to
  take that approach.

> Having to
> reimplement every time when one implementation would do is bothersome
> and generally isn't done unless it has to be (thus why mmap lacks a
> zfill method). Having to do more work than necessary "sucks", as does
> having partial str implementations that don't do everything str does.
> 
> Ideally, I would claim that if some interface will have multiple
> implementations, it should have as few methods as possible to make
> implementation as easy as possible, and move as much as possible
> _away_ from methods and into functions that work with arbitrary
> implementations of the interface. This minimizes the amount of work
> that must be done for implementors and thus makes life better.
> 
> It's also true that it's "bad practice" to have objects with large
> APIs, not for convenience reasons but because it increases object
> coupling, something that "good" object oriented design seeks to
> eliminate. The idea there is that the less ways you can have your
> object interacted with / interact with other objects, the easier it is
> to think of the way state flows. I agree with this in principle, but
> it doesn't really matter for strings.
> 
> The situation I see with something like zfill as-a-method is that it
> has nearly negligible benefit (less imports vs function?) and some
> detriment. So I would conclude it should not exist. Other people look
> at this differently.
  Good response.
  Thank you.
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From tim at akwebsoft.com  Sun Sep 25 22:59:20 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Sun, 25 Sep 2011 18:59:20 -0800
Subject: Suggested coding style
In-Reply-To: <CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
Message-ID: <20110926025920.GO19422@johnsons-web.com>

* Chris Angelico <rosuav at gmail.com> [110925 13:50]:
> On Mon, Sep 26, 2011 at 4:54 AM, Petite Abeille
> <petite.abeille at gmail.com> wrote:
> >
> > On Sep 25, 2011, at 8:46 PM, Tim Johnson wrote:
> >
> >> ?Why does it suck? And why do people say 'suck' so much, especially in technical venues? :)
> >
> > It's a technical term:
> >
> > http://www.osnews.com/images/comics/wtfm.jpg
> 
> Also, because technical people are opinionated windbags. Goes with the
> territory. :) 
 I always felt that to be courteous, to the point and reserved cost
 me less typing time. And since I'm self-employed and only charge
 for productive time for clients, that's being cost-conscious for me.

 Of course I've been known to get a little crazy about PHP. So don't
 let me get started...

 BTW: If you like ranting as a spectator sport, I have found the
 Common Lisp newsgroup to be among the most spectacular. But that's
 just me.
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From rosuav at gmail.com  Sun Sep 25 23:41:29 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Mon, 26 Sep 2011 13:41:29 +1000
Subject: Suggested coding style
In-Reply-To: <20110926025920.GO19422@johnsons-web.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<20110926025920.GO19422@johnsons-web.com>
Message-ID: <CAPTjJmoMdhf5VZ29=XLcGOfPb0rfUKj=Tu--4PMnCAQDCUA+dA@mail.gmail.com>

On Mon, Sep 26, 2011 at 12:59 PM, Tim Johnson <tim at akwebsoft.com> wrote:
> BTW: If you like ranting as a spectator sport, I have found the
> ?Common Lisp newsgroup to be among the most spectacular. But that's
> ?just me.
>

I do, actually, but I don't need to add another newsgroup. Rick
provides plenty of material here, and I can easily sate myself in just
a few other places that I frequent. It's quite amusing to watch those
holy wars erupt...

And every once in a while, they actually prove quite educative. I'm
not sure how it happens, nor how to trigger it - hmm, perhaps this
should be the subject of a scientific paper. "On ranting newsgroups
and how to make them productive".

ChrisA


From wuwei23 at gmail.com  Mon Sep 26 00:18:27 2011
From: wuwei23 at gmail.com (alex23)
Date: Sun, 25 Sep 2011 21:18:27 -0700 (PDT)
Subject: Why is the shutil module called shutil?
References: <c994a15f-1a0b-4087-af16-1e934bf16431@h34g2000yqd.googlegroups.com>
	<0af2c0b5-b901-49fb-901c-275e1bd41a66@fx14g2000vbb.googlegroups.com>
	<mailman.1450.1316926597.27778.python-list@python.org>
	<683887a6-4a2d-4fef-803f-fb7e694a7845@k34g2000yqm.googlegroups.com>
	<fd4f32a2-57ed-4b34-95d8-1575d0ad2c5e@t11g2000yqk.googlegroups.com>
	<605ac6e9-0a83-4658-9240-8889980b1862@8g2000yqm.googlegroups.com>
Message-ID: <098aa3ae-070f-46c5-99e4-f8b712561029@i33g2000yqm.googlegroups.com>

On Sep 26, 9:50?am, rantingrick <rantingr... at gmail.com> wrote:
> Oh the creative juices are flowing now!!!

It's a pity they won't flow into a PyPI project to aggregate interest
in such replacement objects.

But please, spam us some more with your code stubs. It's a nice change
from invective.


From bmacinnis at comcast.net  Mon Sep 26 03:45:11 2011
From: bmacinnis at comcast.net (bmacinnis at comcast.net)
Date: Mon, 26 Sep 2011 03:45:11 -0400
Subject: Counting bits in large string / bit vector
Message-ID: <B10437305E114BA198F2644912B82A35@QUAD>

In Perl I can create a large bit vector as follows:

 

vec($bitmap,10000000,1) = 0;    # this will create a bit string of all zeros

 

To set bits I may using commands like:

 

     vec($bitmap,1000, 1) = 1          # turn on bit 1000

     vec($bitmap,10000, 1) = 1        # turn on bit 10000

     vec($bitmap,1000000, 1) = 1     # turn on bit 10000000

 

which would set three bits in the string $bitmap - Note: in perl I don't
even have to declare $bitmap until I use it in the vec command.

 

Anyway there is a very cool perl command which return the number of bits set
in a large bitmap string instantly. 

The command is:

 

     $setbits = unpack("%32b*", $bitmap);

 

 

Which in this case would store the number 3 in $setbits

 

 

Is there an equivalent command in python that would immediately provide the
number of set bits in a large bit vector/string

 

I know I could loop through but when you have 10,000,000 or 100,000,000
bits, the looping takes quite a while the perl unpack is instant.

 

Thanks for any help you could provide

 

 

 

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From nizamov.shawkat at gmail.com  Mon Sep 26 03:56:56 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Mon, 26 Sep 2011 09:56:56 +0200
Subject: Counting bits in large string / bit vector
In-Reply-To: <B10437305E114BA198F2644912B82A35@QUAD>
References: <B10437305E114BA198F2644912B82A35@QUAD>
Message-ID: <CAFwQ1StJNARy2z21hfOVvmO-JUO69-JAoKEcgLwM608Yt+e8cQ@mail.gmail.com>

> Is there an equivalent command in python that would immediately provide the
> number of set bits in a large bit vector/string
>

You might be able to achieve this using numpy boolean array and, e.g,
the arithmetic sum function or something similar.
There is also another library  http://pypi.python.org/pypi/bitarray
which resembles numpy's bit array.

Hope it helps,
S.Nizamov


From gelonida at gmail.com  Mon Sep 26 04:55:42 2011
From: gelonida at gmail.com (Gelonida N)
Date: Mon, 26 Sep 2011 10:55:42 +0200
Subject: Hierarchical commnd line parsing / help texts
Message-ID: <j5pemf$tnr$1@dough.gmane.org>

Hi,

So far I used optparse.OptionParser for parsing command line arguments
for my python scripts. So far I was happy, with a one level approach,
where I get only one help text

Now I'd like to create a slightly different python script and wondered
which approach / module might be best for implementing the parsing and
generation of help texts.

Please look at my example (let's emulate a shell in python)

$ ./sh.py
or
$ ./sh.py -h
Should create the top level help text and list possible commands
.e.g.
ls
rm
cat
and list some commands with potential sub commands
.e.g.
net
db


then if I typed ./sh.py <command> -h
I'd like to get the helptext for the specified command.

For some more complex commands I'd even like to be able to type


/sh.py <command> <subcommand> -h


Ideally, I would like to be able to parse generic options before
commands / sub commands and less generic options after the commands


./sh.py -v ls -a


Thanks in advance for suggestions





From clp2 at rebertia.com  Mon Sep 26 05:10:17 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 26 Sep 2011 02:10:17 -0700
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <j5pemf$tnr$1@dough.gmane.org>
References: <j5pemf$tnr$1@dough.gmane.org>
Message-ID: <CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 1:55 AM, Gelonida N <gelonida at gmail.com> wrote:
> Hi,
>
> So far I used optparse.OptionParser for parsing command line arguments
> for my python scripts. So far I was happy, with a one level approach,
> where I get only one help text
>
> Now I'd like to create a slightly different python script and wondered
> which approach / module might be best for implementing the parsing and
> generation of help texts.
<snip>
> then if I typed ./sh.py <command> -h
> I'd like to get the helptext for the specified command.

http://docs.python.org/library/argparse.html

It is capable of handling sub-commands and the display of
subcommand-specific help text.

Cheers,
Chris


From __peter__ at web.de  Mon Sep 26 05:11:07 2011
From: __peter__ at web.de (Peter Otten)
Date: Mon, 26 Sep 2011 11:11:07 +0200
Subject: Counting bits in large string / bit vector
References: <B10437305E114BA198F2644912B82A35@QUAD>
Message-ID: <j5pfiv$44d$1@dough.gmane.org>

bmacinnis at comcast.net wrote:

> In Perl I can create a large bit vector as follows:

> vec($bitmap,10000000,1) = 0;    # this will create a bit string of all
> zeros

> To set bits I may using commands like:

>      vec($bitmap,1000, 1) = 1          # turn on bit 1000
>      vec($bitmap,10000, 1) = 1        # turn on bit 10000
>      vec($bitmap,1000000, 1) = 1     # turn on bit 10000000

> which would set three bits in the string $bitmap - Note: in perl I don't
> even have to declare $bitmap until I use it in the vec command.
> Anyway there is a very cool perl command which return the number of bits
> set in a large bitmap string instantly.
 
> The command is:

>      $setbits = unpack("%32b*", $bitmap);

> Which in this case would store the number 3 in $setbits

> Is there an equivalent command in python that would immediately provide
> the number of set bits in a large bit vector/string
> I know I could loop through but when you have 10,000,000 or 100,000,000
> bits, the looping takes quite a while the perl unpack is instant.

With numpy:

>>> b = numpy.zeros(10**7, dtype=bool)
>>> for x in 3, 4, 6: b[10**x] = True
...
>>> b.sum()
3

I don't know how it's implemented, but it seems to be quite fast.



From gelonida at gmail.com  Mon Sep 26 05:28:59 2011
From: gelonida at gmail.com (Gelonida N)
Date: Mon, 26 Sep 2011 11:28:59 +0200
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
Message-ID: <j5pgkr$b0p$1@dough.gmane.org>

On 09/26/2011 11:10 AM, Chris Rebert wrote:
> On Mon, Sep 26, 2011 at 1:55 AM, Gelonida N <gelonida at gmail.com> wrote:
>> Hi,
>>
>> So far I used optparse.OptionParser for parsing command line arguments
>> for my python scripts. So far I was happy, with a one level approach,
>> where I get only one help text
>>
>> Now I'd like to create a slightly different python script and wondered
>> which approach / module might be best for implementing the parsing and
>> generation of help texts.
> <snip>
>> then if I typed ./sh.py <command> -h
>> I'd like to get the helptext for the specified command.
> 
> http://docs.python.org/library/argparse.html
> 
> It is capable of handling sub-commands and the display of
> subcommand-specific help text.
> 
Thanks a lot.
It seems it's time to start reading about argparse



From arnodel at gmail.com  Mon Sep 26 06:02:02 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Mon, 26 Sep 2011 11:02:02 +0100
Subject: Counting bits in large string / bit vector
In-Reply-To: <j5pfiv$44d$1@dough.gmane.org>
References: <B10437305E114BA198F2644912B82A35@QUAD>
	<j5pfiv$44d$1@dough.gmane.org>
Message-ID: <CAJ6cK1b9wiHYPz8iz8OiYLSkj=N1Rau1BrQ+Hu4Pnvnkj7Vp7w@mail.gmail.com>

>>>> b = numpy.zeros(10**7, dtype=bool)
>>>> for x in 3, 4, 6: b[10**x] = True
> ...
>>>> b.sum()
> 3

Without numpy:

>>> counts = [bin(i).count('1') for i in range(256)]
>>> bytes = b"hello python"*100000
>>> len(bytes)*8
9600000
>>> sum(map(counts.__getitem__, bytes))
4800000

Pretty fast as well.

-- 
Arnaud


From taleinat at gmail.com  Mon Sep 26 07:23:04 2011
From: taleinat at gmail.com (Tal Einat)
Date: Mon, 26 Sep 2011 04:23:04 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
Message-ID: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>

The library is called RunningCalcs and is useful for running several
calculations on a single iterable of values.

https://bitbucket.org/taleinat/runningcalcs/
http://pypi.python.org/pypi/RunningCalcs/

I'd like some input on how this could be made more useful and how to
spread the word about it.


The library contains the base RunningCalc class and implementations of
sub-classes for common calculations: sum, min/max, average, variance &
standard deviation, n-largest & n-smallest. Additionaly a utility
function apply_in_parallel() is supplied which makes running several
calculations on an iterable easy (and fast!).

Straight-forward example:

mean_rc, stddev_rc = RunningMean(), RunningStdDev()
for x in values:
    mean_rc.feed(x)
    stddev_rc.feed(x)
mean, stddev = mean_rc.value, stddev_rc.value

Examples using apply_in_parallel():

mean, stddev = apply_in_parallel(values, [RunningMean(),
RunningStdDev()])
five_smallest, five_largest = apply_in_parallel(values,
[RunningNSmallest(5), RunningNLargest(5)])


Comments and suggestions would be highly appreciated!


From casevh at gmail.com  Mon Sep 26 11:38:57 2011
From: casevh at gmail.com (casevh)
Date: Mon, 26 Sep 2011 08:38:57 -0700 (PDT)
Subject: Counting bits in large string / bit vector
References: <B10437305E114BA198F2644912B82A35@QUAD>
	<mailman.1470.1317023820.27778.python-list@python.org>
Message-ID: <d8dafcc9-b8c9-4772-b008-2087edce1e9f@fx14g2000vbb.googlegroups.com>

On Sep 26, 12:56?am, Nizamov Shawkat <nizamov.shaw... at gmail.com>
wrote:
> > Is there an equivalent command in python that would immediately provide the
> > number of set bits in a large bit vector/string
>
> You might be able to achieve this using numpy boolean array and, e.g,
> the arithmetic sum function or something similar.
> There is also another library ?http://pypi.python.org/pypi/bitarray
> which resembles numpy's bit array.
>
> Hope it helps,
> S.Nizamov

You can also use gmpy or gmpy2.

>>> a=gmpy2.mpz(123)
>>> bin(a)
'0b1111011'
>>> gmpy2.hamdist(a,0)
6
>>>

casevh


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From ian.g.kelly at gmail.com  Mon Sep 26 12:39:16 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 26 Sep 2011 10:39:16 -0600
Subject: Counting bits in large string / bit vector
Message-ID: <CALwzid=rH7eJwefvuKGP8FMABos=Nxbgy3EsTxpZZo__18hASA@mail.gmail.com>

On Sep 26, 2011 1:49 AM, <bmacinnis at comcast.net> wrote:
> Is there an equivalent command in python that would immediately provide
the number of set bits in a large bit vector/string

Besides what others have said, if you expect the number of bits set to be
small, you might just use a set.

bits = set()
# set bit 1000
bits.add(1000)
# clear bit 2000000
bits.discard(2000000)
# test bit 1000
if 1000 in bits:
    pass
# get number of bits set
len(bits)

All of these operations are O(1), but if you expect to set a very large
number of bits, then the space trade-off may not be practical.

Cheers,
Ian
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From rahul_g_chaudhary at yahoo.com  Mon Sep 26 13:45:42 2011
From: rahul_g_chaudhary at yahoo.com (Rahul)
Date: Mon, 26 Sep 2011 10:45:42 -0700 (PDT)
Subject: Python Weekly
Message-ID: <13c6df6c-7ab5-4cf6-b82b-9e7631226a8b@i9g2000yqe.googlegroups.com>

Hi Everyone,

I have started a free weekly newsletter called Python Weekly which
includes curated news, articles, new releases, software & tools,
events, jobs etc about Python and related technologies. It's a great
way to keep abreast of what's happening in Python land. You can
subscribe to it here, http://www.pythonweekly.com/

Regards
Rahul Chaudhary


From jesus.ramirez.utexas at gmail.com  Mon Sep 26 14:16:08 2011
From: jesus.ramirez.utexas at gmail.com (Jesramz)
Date: Mon, 26 Sep 2011 11:16:08 -0700 (PDT)
Subject: Python 2.5 zlib trouble
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
	<mailman.1448.1316911903.27778.python-list@python.org>
Message-ID: <16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>


I appreciate all the help, but I am still a little confused. Sorry,
I'm a lay person.

Should I download zlib1g-dev and install it to get the zlib module?

and Alter the configure script to avoid future issues?

Also about getting zlib I found the following:

"I was able to recompile zlib

$./configure --shared

then recompile Python 2.5.1; I am now able to import the zlib module.

cheers

-sg"

Does this mean that while in the zlib folder run ./configure shared
and then install python?


From ramit.prasad at jpmorgan.com  Mon Sep 26 14:57:52 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Mon, 26 Sep 2011 14:57:52 -0400
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <j5pgkr$b0p$1@dough.gmane.org>
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
	<j5pgkr$b0p$1@dough.gmane.org>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>

> It seems it's time to start reading about argparse
FYI, it only appears on Python 2.7+

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From benjamin.kaplan at case.edu  Mon Sep 26 15:04:45 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 26 Sep 2011 15:04:45 -0400
Subject: Python 2.5 zlib trouble
In-Reply-To: <16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
	<mailman.1448.1316911903.27778.python-list@python.org>
	<16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>
Message-ID: <CAMuTYXiE6HDP3UATaDd60f9ysgMR1SU-HYDp0Lo2NSvgxe=g+w@mail.gmail.com>

On Mon, Sep 26, 2011 at 2:16 PM, Jesramz <jesus.ramirez.utexas at gmail.com> wrote:
>
> I appreciate all the help, but I am still a little confused. Sorry,
> I'm a lay person.
>
> Should I download zlib1g-dev and install it to get the zlib module?
>
> and Alter the configure script to avoid future issues?
>
> Also about getting zlib I found the following:
>
> "I was able to recompile zlib
>
> $./configure --shared
>
> then recompile Python 2.5.1; I am now able to import the zlib module.
>
> cheers
>
> -sg"
>
> Does this mean that while in the zlib folder run ./configure shared
> and then install python?
> --

Not quite. This person was talking about configuring zlib, not Python.
Just about every Linux program out there has a ./configure file- it's
part of GNU Autotools, which many programs use as an easy way to
compile and install their software. Since the version of zlib on
Ubuntu Natty doesn't work for Python 2.5, this person just compiled
their own zlib (calling ./configure --shared; make; make install from
the zlib *source* folder that they downloaded) and then compiled their
own Python version (from the Python source folder that they
downloaded)


> http://mail.python.org/mailman/listinfo/python-list
>


From paul.nospam at rudin.co.uk  Mon Sep 26 15:44:02 2011
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Mon, 26 Sep 2011 20:44:02 +0100
Subject: Hierarchical commnd line parsing / help texts
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
	<j5pgkr$b0p$1@dough.gmane.org>
	<mailman.1485.1317065300.27778.python-list@python.org>
Message-ID: <874nzz3x8d.fsf@no-fixed-abode.cable.virginmedia.net>

"Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:

> This email is confidential...

Probably a bad idea to post it to a world readable mailing list then :)


From joncle at googlemail.com  Mon Sep 26 16:07:43 2011
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 26 Sep 2011 13:07:43 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
Message-ID: <abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>

On Sep 26, 12:23?pm, Tal Einat <talei... at gmail.com> wrote:
> The library is called RunningCalcs and is useful for running several
> calculations on a single iterable of values.
>
> https://bitbucket.org/taleinat/runningcalcs/http://pypi.python.org/pypi/RunningCalcs/
>
> I'd like some input on how this could be made more useful and how to
> spread the word about it.
>
> The library contains the base RunningCalc class and implementations of
> sub-classes for common calculations: sum, min/max, average, variance &
> standard deviation, n-largest & n-smallest. Additionaly a utility
> function apply_in_parallel() is supplied which makes running several
> calculations on an iterable easy (and fast!).
>
> Straight-forward example:
>
> mean_rc, stddev_rc = RunningMean(), RunningStdDev()
> for x in values:
> ? ? mean_rc.feed(x)
> ? ? stddev_rc.feed(x)
> mean, stddev = mean_rc.value, stddev_rc.value
>
> Examples using apply_in_parallel():
>
> mean, stddev = apply_in_parallel(values, [RunningMean(),
> RunningStdDev()])
> five_smallest, five_largest = apply_in_parallel(values,
> [RunningNSmallest(5), RunningNLargest(5)])
>
> Comments and suggestions would be highly appreciated!

You may not of heard of it, but the SAS language has something called
PROC FREQ... I'm imagining that maybe this is where you should be
taking this. Sorry I can't comment on the code, as I haven't really
got time, but have a look! (I'd be willing to invest sometime with
you, if you agree that's where something like this should be going...)

Cheers,

Jon.


From python.list at tim.thechases.com  Mon Sep 26 16:11:44 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 26 Sep 2011 15:11:44 -0500
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>
References: <j5pemf$tnr$1@dough.gmane.org>	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>	<j5pgkr$b0p$1@dough.gmane.org>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <4E80DC80.8090808@tim.thechases.com>

On 09/26/11 13:57, Prasad, Ramit wrote:
>> It seems it's time to start reading about argparse
> FYI, it only appears on Python 2.7+

However I believe it can be uneventfully copied and run under 
several versions earlier (likely back to 2.5, perhaps to 2.4 -- I 
no longer have 2.4 at my fingertips to test).

-tkc





From ian.g.kelly at gmail.com  Mon Sep 26 16:33:54 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Mon, 26 Sep 2011 14:33:54 -0600
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <4E80DC80.8090808@tim.thechases.com>
References: <j5pemf$tnr$1@dough.gmane.org>
	<CAMZYqRTRpiSjBymzUekAa-UoQn3ztvg=pL8nUh9FhD0EQnCgEQ@mail.gmail.com>
	<j5pgkr$b0p$1@dough.gmane.org>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F2073A804@EMARC112VS01.exchad.jpmchase.net>
	<4E80DC80.8090808@tim.thechases.com>
Message-ID: <CALwzidmruB4hhi9n8Qwb9pXfxvhiwMvHUsCyxMndtJQ9mhiB-w@mail.gmail.com>

On Mon, Sep 26, 2011 at 2:11 PM, Tim Chase
<python.list at tim.thechases.com> wrote:
> On 09/26/11 13:57, Prasad, Ramit wrote:
>>>
>>> It seems it's time to start reading about argparse
>>
>> FYI, it only appears on Python 2.7+
>
> However I believe it can be uneventfully copied and run under several
> versions earlier (likely back to 2.5, perhaps to 2.4 -- I no longer have 2.4
> at my fingertips to test).

For older versions it would be best to use the Google project, which I
think is still maintained and backported:

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


From jabba.laci at gmail.com  Mon Sep 26 16:39:28 2011
From: jabba.laci at gmail.com (Jabba Laci)
Date: Mon, 26 Sep 2011 16:39:28 -0400
Subject: install packages with pip to older Python versions
Message-ID: <CAOuJsMk33V0WoX+a2X37jDuzw471FfU+3JVBX=GS2Kk-epcNkg@mail.gmail.com>

Hi,

I have Python 2.7 on my system. Today I wanted to try Google App
Engine but it runs on Python 2.5 at Google so I installed this version
on my machine next to v2.7 to avoid compatibility problems. However,
when I start the Python shell v2.5 and try to import something from
the GAE SDK (for instance "from google.appengine.ext import webapp"),
I get an error: "ImportError: No module named webob". (Note that with
v2.7 I don't have this problem.)

So, how can I install packages for a specific version of Python (here,
v2.5)? With 2.7 I use "sudo pip install <package_name>".

Thanks,

Laszlo


From tgugger at bex.net  Mon Sep 26 16:56:51 2011
From: tgugger at bex.net (TOM)
Date: Mon, 26 Sep 2011 13:56:51 -0700 (PDT)
Subject: QA Engineering/ Python/ Contract/ Austin, TX
Message-ID: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>

Tom Gugger
Independent Recruiter
tgugger at bex.net

US Citizens or Greencard
On Site


QA Engineering/ Python/ Contract/ Austin, TX

This is an immediate start, such as next week. I need three
contractors
for a 4--6 month contract in Austin, TX for Quality Assurance
Engineers.
The location is Austin, TX.

This is an automation project.

Must Have ? Good Network domain knowledge such as TCP/IP.

Must Have --- experience testing  Data, Voice, and IPTV traffic.

Must Have --- Strong Python

A Plus --- Fanfare

Please make sure all the required skills show on the resume. If
interested and
qualified, email resume to tgugger at bex.net.


From clp2 at rebertia.com  Mon Sep 26 17:03:49 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 26 Sep 2011 14:03:49 -0700
Subject: QA Engineering/ Python/ Contract/ Austin, TX
In-Reply-To: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>
References: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>
Message-ID: <CAMZYqRRq6ymmAiJqD+UN10z+aysEmQd1t_FP4MEDj4rE_Bz=JQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 1:56 PM, TOM <tgugger at bex.net> wrote:
> Tom Gugger
> Independent Recruiter
> tgugger at bex.net
>
> US Citizens or Greencard
> On Site
>
>
> QA Engineering/ Python/ Contract/ Austin, TX
>
> This is an immediate start, such as next week. I need three
> contractors

Such postings belong on the Python jobs board
(http://www.python.org/community/jobs/ ), not
python-list/comp.lang.python.

Cheers,
Chris


From atherun at gmail.com  Mon Sep 26 21:07:31 2011
From: atherun at gmail.com (Atherun)
Date: Mon, 26 Sep 2011 18:07:31 -0700 (PDT)
Subject: Race condition deadlock in communicate when threading?
Message-ID: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>

In python 2.6.4 I have a fairly complex system running (copying and
pasting it would be quite difficult).  At its core there are builders
that inherit from threading.Thread.  I have some builders that run
external tasks via popen and read output using communicate.  I have
the ability to run any number of builders in parallel. All of this
uses logging as well, where each builder has their own logger they
create from the base logger i.e. logging.getLogger("Logger.
%s"%self.Name).

When running several threads in parallel that each call popen and
communicate functions, python just hangs, about 95% of the time.  All
of it, parent threads, any threads I started before I got to this
step, it just stops responding.  Stepping through it with pdb trying
to find the deadlock will always make it work, killing the external
app I called via popen, after it has hung, will make it move along as
well. Looking at the stack traces using the code found
http://code.activestate.com/recipes/577334-how-to-debug-deadlocked-multi-threaded-programs/
the threads stop running with the following stacks, this is the last
output from the tracer before it stops responding.:

File: "c:\src\extern\python\lib\threading.py", line 497, in
__bootstrap
  self.__bootstrap_inner()
File: "c:\src\extern\python\lib\threading.py", line 525, in
__bootstrap_inner
  self.run()
File: "c:\src\extern\python\lib\threading.py", line 477, in run
  self.__target(*self.__args, **self.__kwargs)
File: "c:\src\extern\python\lib\subprocess.py", line 877, in
_readerthread
  buffer.append(fh.read())

And

out, err = proc.communicate("change: new\ndescription: %s
\n"%changelistDesc)
File: "c:\src\extern\python\lib\subprocess.py", line 689, in
communicate
  return self._communicate(input)
File: "c:\src\extern\python\lib\subprocess.py", line 903, in
_communicate
  stdout_thread.join()
File: "c:\src\extern\python\lib\threading.py", line 637, in join
  self.__block.wait()
File: "c:\src\extern\python\lib\threading.py", line 237, in wait
  waiter.acquire()

I'm trying to track this down so I can eliminate it for good as it
pops up in multiple places from time to time.

Any tips would be appreciated.


From wuwei23 at gmail.com  Mon Sep 26 23:11:13 2011
From: wuwei23 at gmail.com (alex23)
Date: Mon, 26 Sep 2011 20:11:13 -0700 (PDT)
Subject: install packages with pip to older Python versions
References: <mailman.1488.1317069590.27778.python-list@python.org>
Message-ID: <ca08c8f0-052a-4ba5-8858-d9da0890f60b@x19g2000vbl.googlegroups.com>

On Sep 27, 6:39?am, Jabba Laci <jabba.l... at gmail.com> wrote:
> So, how can I install packages for a specific version of Python (here,
> v2.5)? With 2.7 I use "sudo pip install <package_name>".

It's amazing what you can find when you look at the documentation:
http://www.pip-installer.org/en/latest/index.html

"You can use pip install --upgrade SomePackage to upgrade to a newer
version, or pip install SomePackage==1.0.4 to install a very specific
version."

However, if you're not using virtualenv, I'd recommend looking at it
as well: http://pypi.python.org/pypi/virtualenv


From devplayer at gmail.com  Tue Sep 27 02:45:21 2011
From: devplayer at gmail.com (DevPlayer)
Date: Mon, 26 Sep 2011 23:45:21 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<20110924191048.GH19422@johnsons-web.com>
	<mailman.1437.1316892943.27778.python-list@python.org>
	<4e7e93bc$0$29987$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJ+1x_DVY4W+DaBWhxVCRSxmJWPuPqMnQK5tUSaoXB0bpg@mail.gmail.com>
	<20110925184614.GK19422@johnsons-web.com>
	<53F42DEB-FC82-48C7-BB15-64F11F2395DC@gmail.com>
	<CAPTjJmqjzm_D1PrP4vYD1CSxqxaOog08GxHEp0i8KTNEKOqcJQ@mail.gmail.com>
	<20110926025920.GO19422@johnsons-web.com>
	<mailman.1468.1317008498.27778.python-list@python.org>
Message-ID: <492cb266-01df-493c-86d2-1a994933e570@p11g2000yqe.googlegroups.com>

On Sep 25, 11:41?pm, Chris Angelico <ros... at gmail.com> wrote:
> On Mon, Sep 26, 2011 at 12:59 PM, Tim Johnson <t... at akwebsoft.com> wrote:
> > BTW: If you like ranting as a spectator sport, I have found the
> > ?Common Lisp newsgroup to be among the most spectacular. But that's
> > ?just me.
>
> I do, actually, but I don't need to add another newsgroup. Rick
> provides plenty of material here, and I can easily sate myself in just
> a few other places that I frequent. It's quite amusing to watch those
> holy wars erupt...
>
> And every once in a while, they actually prove quite educative. I'm
> not sure how it happens, nor how to trigger it - hmm, perhaps this
> should be the subject of a scientific paper. "On ranting newsgroups
> and how to make them productive".
>
> ChrisA

I think intellectual growth from rants works like this:

Ranter: Bla bla, bad logic, poor facts, some point.
Others: Bla bla you rant Mr Ranter, some logic, few facts, same point.
Ranter: bad mouthing
Others: bad mouthing back
Ranter: Bla Bla, I don't rant, better logic counter facts, lots of
opinion (to not get called a ranter)
Others: Bla bla, You do rant Ranter, good counter logic and facts,
same point (some reason needs to put Ranter "in his place")
Ranter: Super Bla, long winded logic with some strong points, random
but accurate facts out the wazzu (tries to save face)
Others: Acknowleges Ranters point are accurate but claims they don't
apply
Ranter: makes case his points do.
Others: agrees to disagree, silently picks mute Ranter,
Ranter: picks a new topic and starts over.


From devplayer at gmail.com  Tue Sep 27 02:51:08 2011
From: devplayer at gmail.com (DevPlayer)
Date: Mon, 26 Sep 2011 23:51:08 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>

By the way OP Passiday the title of the topic is "Suggested coding
style".

Are you suggesting a coding style or asking for a Python coding style
or are you asking what IS the Python coding style.

If you are asking what is the Python coding style. Google The Zen of
Python. It's pretty much the dictum of coding style and referred to
alot by many Pythoneers.


From pavlovevidence at gmail.com  Tue Sep 27 03:17:50 2011
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 27 Sep 2011 00:17:50 -0700 (PDT)
Subject: Race condition deadlock in communicate when threading?
In-Reply-To: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
Message-ID: <29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>

There's really not enough information for us to debug this, but one possibility is that your subprocess is using buffered I/O; you're expecting the external task to write a string, but it doesn't actually write that string because it's sitting in a buffer.  First thing to try is to see if the program accepts some kind of command line argument to run in unbuffered mode (for instance, if you are calling a Python interpreter you can pass it the -u switch to force unbuffered I/O).  If (like most programs) it doesn't have an option to disable buffering, you can try running it on a pty device (if you're on Unix).  If worse comes to worst, see if there's a way to get the external task to print lots of extra output (a verbosity setting, for instance); that could work in a pinch until you can debug it more thoroughly.


Carl Banks


From r32813 at freescale.com  Tue Sep 27 05:08:54 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Tue, 27 Sep 2011 09:08:54 +0000
Subject: Error 'module' object has no attribute "_extension_registry" when
	cPickle is imported from an installed Python 2.7.1
In-Reply-To: <29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
Message-ID: <02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>

Hello all,

I encounter this issue whereby I am not able to load cPickle module into the python I newly built. There is no issue when I load it right from the folder where the python executable and libpython2.7.so is built. However, it gives me this error when I load the same module using the installed files (python and all its modules, shared library from default /use/local folder that contains bin, lib, include sub-folders) from "make install" command.

Does anyone know why? Here is the error:-

$ python
Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
Type "help", "copyright", "credits" or "license" for more information.
>>> import cPickle
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute '_extension_registry'





From r32813 at freescale.com  Tue Sep 27 05:28:31 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Tue, 27 Sep 2011 09:28:31 +0000
Subject: Error 'No module named _sha256' when importing random in python 2.7.1 
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13> 
Message-ID: <02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>

I just built python 2.7.1 on my HP Itanium 64-bit platform, using aCC. I encountered following issue when importing the random module. Does anyone know why am I getting this error? Thanks in advance for your reply. 

$ python
Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
Type "help", "copyright", "credits" or "license" for more information.
>>> import random
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "random.py", line 49, in <module>
    import hashlib as _hashlib
  File "hashlib.py", line 136, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "hashlib.py", line 74, in __get_builtin_constructor
    import _sha256
ImportError: No module named _sha256
>>> 
 



From clp2 at rebertia.com  Tue Sep 27 05:51:30 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 27 Sep 2011 02:51:30 -0700
Subject: Error 'No module named _sha256' when importing random in python
	2.7.1
In-Reply-To: <02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>
Message-ID: <CAMZYqRSrTQ=Rx75QURHCpfo+FRXNVJhx61Xa8ZMT9nvnxJuGmQ@mail.gmail.com>

On Tue, Sep 27, 2011 at 2:28 AM, Wong Wah Meng-R32813
<r32813 at freescale.com> wrote:
> I just built python 2.7.1 on my HP Itanium 64-bit platform, using aCC. I encountered following issue when importing the random module. Does anyone know why am I getting this error? Thanks in advance for your reply.
<snip>
> ?File "hashlib.py", line 74, in __get_builtin_constructor
> ? ?import _sha256
> ImportError: No module named _sha256

Did you get a message along the lines of "Python build finished, but
the necessary bits to build these modules were not found:" when you
built Python?

Cheers,
Chris


From r32813 at freescale.com  Tue Sep 27 06:04:50 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Tue, 27 Sep 2011 10:04:50 +0000
Subject: Error 'No module named _sha256' when importing random in python
	2.7.1
In-Reply-To: <CAMZYqRSrTQ=Rx75QURHCpfo+FRXNVJhx61Xa8ZMT9nvnxJuGmQ@mail.gmail.com>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F5942D@039-SN1MPN1-003.039d.mgd.msft.net>
	<CAMZYqRSrTQ=Rx75QURHCpfo+FRXNVJhx61Xa8ZMT9nvnxJuGmQ@mail.gmail.com>
Message-ID: <02EA6D704E30CE499C5071776509A925F59485@039-SN1MPN1-003.039d.mgd.msft.net>

Yes I did. In fact earlier "make test" failed to execute due to _sha256 not found in one of the module testing. 

Earlier I ignored these failures from the build and make test as I thought they are not needed by my application. Now I can't use "random" module in my application. So I need to solve this issue. 

Here is the output of the build. 

Python build finished, but the necessary bits to build these modules were not found:
_bsddb             _curses            _curses_panel   
_sqlite3           _ssl               bsddb185        
bz2                dl                 gdbm            
imageop            linuxaudiodev      ossaudiodev     
readline           spwd               sunaudiodev     
zlib                                                  
To find the necessary bits, look in setup.py in detect_modules() for the module's name.


Failed to build these modules:
_ctypes            termios                            

Regards,
Wah Meng

-----Original Message-----
From: chris at rebertia.com [mailto:chris at rebertia.com] On Behalf Of Chris Rebert
Sent: Tuesday, September 27, 2011 5:52 PM
To: Wong Wah Meng-R32813
Cc: python-list at python.org
Subject: Re: Error 'No module named _sha256' when importing random in python 2.7.1

On Tue, Sep 27, 2011 at 2:28 AM, Wong Wah Meng-R32813
<r32813 at freescale.com> wrote:
> I just built python 2.7.1 on my HP Itanium 64-bit platform, using aCC. I encountered following issue when importing the random module. Does anyone know why am I getting this error? Thanks in advance for your reply.
<snip>
> ?File "hashlib.py", line 74, in __get_builtin_constructor
> ? ?import _sha256
> ImportError: No module named _sha256

Did you get a message along the lines of "Python build finished, but
the necessary bits to build these modules were not found:" when you
built Python?

Cheers,
Chris




From yixuan178 at gmail.com  Tue Sep 27 06:48:07 2011
From: yixuan178 at gmail.com (yixuan)
Date: Tue, 27 Sep 2011 03:48:07 -0700 (PDT)
Subject: error when use portable python 2.7.2
Message-ID: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>

Hello,
I copy python 2.7.2 folder from other machine to my new installed
Windows XP.
If I run python.exe it would say side by side error, it is caused by
crt environment.
I copy msvc90 runtime and manifest into my folder, python.exe seems
working now.
But when I used 'import FixTk', it would say "dll load failed",
actually, it also a side by side error, if I paste crt libraries into
Dlls folder, it can be solved. But I don't think it is a good
solution.
How can I set it to prevent above error? w/o install any microsoft
package. I want to user can use my package when they unpack it.

Thanks,
Eugene


From alec.taylor6 at gmail.com  Tue Sep 27 07:01:32 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Tue, 27 Sep 2011 21:01:32 +1000
Subject: error when use portable python 2.7.2
In-Reply-To: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
References: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
Message-ID: <CAO+9iGeuF0AvDUoRT5vch9iazU6J5NBTLFXupZYLZipjQRh=Cg@mail.gmail.com>

You're looking for this:
http://www.portablepython.com/wiki/PortablePython2.7.2.1

On Tue, Sep 27, 2011 at 8:48 PM, yixuan <yixuan178 at gmail.com> wrote:
> Hello,
> I copy python 2.7.2 folder from other machine to my new installed
> Windows XP.
> If I run python.exe it would say side by side error, it is caused by
> crt environment.
> I copy msvc90 runtime and manifest into my folder, python.exe seems
> working now.
> But when I used 'import FixTk', it would say "dll load failed",
> actually, it also a side by side error, if I paste crt libraries into
> Dlls folder, it can be solved. But I don't think it is a good
> solution.
> How can I set it to prevent above error? w/o install any microsoft
> package. I want to user can use my package when they unpack it.
>
> Thanks,
> Eugene
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mikehulluk at googlemail.com  Tue Sep 27 07:54:10 2011
From: mikehulluk at googlemail.com (Mike Hull)
Date: Tue, 27 Sep 2011 04:54:10 -0700 (PDT)
Subject: atexit handlers - getting the return code
Message-ID: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>

Hi,
I work in neuroscience modelling and use python for lots of my work.
One problem I have is management of scripts and results. To that end,
I have
written code that make its easier to keep track of scripts, to see
which ones
have run, or need to be rerun, to see output errors and generally
organise running of scripts better.

The way i have implemented it is that I register a function to the
atexit module,
which takes care of recording information about the script run; such
as whether an
exception was raised and not caught, and how long it took to run and
the
stdout/stderr streams; which can then be uploaded into a database.

One thing I am struggling to get though is the 'return code' that the
is going to be returned after my
atexit handlers have finished. Could anyone tell me how it get at
this!?


Thanks


Mike



From yixuan178 at gmail.com  Tue Sep 27 08:00:30 2011
From: yixuan178 at gmail.com (yixuan)
Date: Tue, 27 Sep 2011 05:00:30 -0700 (PDT)
Subject: error when use portable python 2.7.2
References: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
	<mailman.1494.1317121295.27778.python-list@python.org>
Message-ID: <3f4dc714-17c7-4b27-82ff-9f1c50ad5846@g33g2000yqc.googlegroups.com>

On Sep 27, 7:01?pm, Alec Taylor <alec.tayl... at gmail.com> wrote:
> You're looking for this:http://www.portablepython.com/wiki/PortablePython2.7.2.1
>
>
>
>
>
>
>
> On Tue, Sep 27, 2011 at 8:48 PM, yixuan <yixuan... at gmail.com> wrote:
> > Hello,
> > I copy python 2.7.2 folder from other machine to my new installed
> > Windows XP.
> > If I run python.exe it would say side by side error, it is caused by
> > crt environment.
> > I copy msvc90 runtime and manifest into my folder, python.exe seems
> > working now.
> > But when I used 'import FixTk', it would say "dll load failed",
> > actually, it also a side by side error, if I paste crt libraries into
> > Dlls folder, it can be solved. But I don't think it is a good
> > solution.
> > How can I set it to prevent above error? w/o install any microsoft
> > package. I want to user can use my package when they unpack it.
>
> > Thanks,
> > Eugene
> > --
> >http://mail.python.org/mailman/listinfo/python-list

Alec,
Thanks for your information. But in that site, it seems how to rebuild
python for another use.
My issue is that, when I install python 2.7.2 in one windows, then I
want to copy that folder to my new installed windows, and try to run
python. It will ask CRT environment.
Why I need that scenario, i want to package python in my package, so I
want it to run one new installed windows which w/o any crt runtime
installed.

For more convenience, my issue seems like that in DLLs folder, there
has some dlls, python would load them when needed, but when run
application, it couldn't find crt files which stored in python root
folder. So how to set that all dll can find that folder?

Thanks,
Eugene


From drobinow at gmail.com  Tue Sep 27 08:15:10 2011
From: drobinow at gmail.com (David Robinow)
Date: Tue, 27 Sep 2011 08:15:10 -0400
Subject: install packages with pip to older Python versions
In-Reply-To: <CAOuJsMk33V0WoX+a2X37jDuzw471FfU+3JVBX=GS2Kk-epcNkg@mail.gmail.com>
References: <CAOuJsMk33V0WoX+a2X37jDuzw471FfU+3JVBX=GS2Kk-epcNkg@mail.gmail.com>
Message-ID: <CAF3Xjbz+gpOtM32a-HW=gbzLffz1Ycu3cRunCZ_sqVhScYexeQ@mail.gmail.com>

On Mon, Sep 26, 2011 at 4:39 PM, Jabba Laci <jabba.laci at gmail.com> wrote:
> Hi,
>
> I have Python 2.7 on my system. Today I wanted to try Google App
> Engine but it runs on Python 2.5 at Google so I installed this version
> on my machine next to v2.7 to avoid compatibility problems. However,
> when I start the Python shell v2.5 and try to import something from
> the GAE SDK (for instance "from google.appengine.ext import webapp"),
> I get an error: "ImportError: No module named webob". (Note that with
> v2.7 I don't have this problem.)
>
> So, how can I install packages for a specific version of Python (here,
> v2.5)? With 2.7 I use "sudo pip install <package_name>".
sudo pip-2.5 install <package_name>

(You may need to install pip in your 2.5)


From nizamov.shawkat at gmail.com  Tue Sep 27 08:35:38 2011
From: nizamov.shawkat at gmail.com (Nizamov Shawkat)
Date: Tue, 27 Sep 2011 14:35:38 +0200
Subject: error when use portable python 2.7.2
In-Reply-To: <3f4dc714-17c7-4b27-82ff-9f1c50ad5846@g33g2000yqc.googlegroups.com>
References: <701e2da1-5a1b-4004-afae-21f0291c6563@j1g2000yqj.googlegroups.com>
	<mailman.1494.1317121295.27778.python-list@python.org>
	<3f4dc714-17c7-4b27-82ff-9f1c50ad5846@g33g2000yqc.googlegroups.com>
Message-ID: <CAFwQ1SuYjNJxTFBo69WOZ80EVP6UV1G_FH6afJYKQi+J_FrRFA@mail.gmail.com>

I bet that the difference is in the environment settings (PYTHONPATH).
Look here for details how to set it manually:

http://docs.python.org/using/windows.html


Hope it helps,
S.Nizamov


From g.rodola at gmail.com  Tue Sep 27 08:55:17 2011
From: g.rodola at gmail.com (=?ISO-8859-1?Q?Giampaolo_Rodol=E0?=)
Date: Tue, 27 Sep 2011 14:55:17 +0200
Subject: atexit handlers - getting the return code
In-Reply-To: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
Message-ID: <CAFYqXL8=k=hop-uzcepOhX5fdz95HY-bmMb1Jr_oS7AUCW14zA@mail.gmail.com>

You mean the registered function return value or the process return code?
In the first case you can do something such as:

import atexit

@atexit.register
def cleanup():
     def actual_function():
           ...
           return something
     ret = actual_function()
     # do something with ret

In the latter case you can use sys.exit(code).

--- Giampaolo
http://code.google.com/p/pyftpdlib/
http://code.google.com/p/psutil/

2011/9/27 Mike Hull <mikehulluk at googlemail.com>:
> Hi,
> I work in neuroscience modelling and use python for lots of my work.
> One problem I have is management of scripts and results. To that end,
> I have
> written code that make its easier to keep track of scripts, to see
> which ones
> have run, or need to be rerun, to see output errors and generally
> organise running of scripts better.
>
> The way i have implemented it is that I register a function to the
> atexit module,
> which takes care of recording information about the script run; such
> as whether an
> exception was raised and not caught, and how long it took to run and
> the
> stdout/stderr streams; which can then be uploaded into a database.
>
> One thing I am struggling to get though is the 'return code' that the
> is going to be returned after my
> atexit handlers have finished. Could anyone tell me how it get at
> this!?
>
>
> Thanks
>
>
> Mike
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mikehulluk at googlemail.com  Tue Sep 27 09:37:10 2011
From: mikehulluk at googlemail.com (Mike Hull)
Date: Tue, 27 Sep 2011 06:37:10 -0700 (PDT)
Subject: atexit handlers - getting the return code
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
	<mailman.1497.1317128120.27778.python-list@python.org>
Message-ID: <bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>

Hi Giampaolo,
Sorry, I didn't explain very clearly.
I have a python file, 'simulation_logger.py', (given below).
Then, in my scripts, I add the following lines to the top,



#simulation1.py:
###################
from simulation_logger  import SimulationDecorator
SimulationDecorator.Init()

# Rest of the simulation script....

#####################

and at the end of the simulation, it should write the stdout/stderr,
the return code and any top level exception details into a database.
This is working except I can't work out how to get the return code
the script is going to return.
Any help would be gratefully appreciated,

Thanks!

Mike










# simulation_logger.py
########################

import atexit
import sys
import os
import cStringIO
import time
import traceback
import datetime
import inspect

class SimulationRunInfo(object):
 def __init__(self, script_name ):
    self.return_code = None
    self.time_taken = None
    self.time_out = None
    self.std_out = None
    self.std_err = None
    self.exception_details = None,None

    self.script_name = script_name



class IOStreamDistributor(object):
    def __init__(self, outputs):
        self.outputs = outputs

    def write(self,  *args, **kwargs):
        for op in self.outputs:
            op.write(*args, **kwargs)




class SimulationDecorator(object):

    start_time = None
    time_out = None
    is_initialised = False
    exception_details = None,None

    std_out = None
    std_err = None
    script_name = None





    @classmethod
    def exit_handler(cls, *args, **kwargs):
        print 'Exit Handler'
        print 'Args', args
        print 'KwArgs', kwargs

        info = SimulationRunInfo( cls.script_name)

        # Read and restore the StdOut/Err
        info.std_out = cls.std_out.getvalue()
        sys.stdout = sys.__stdout__
        info.std_err = cls.std_err.getvalue()
        sys.stderr = sys.__stderr__

        # Get the return value:
        info.return_code = 0

        # Get the timing:
        info.time_taken = int( time.time() - cls.start_time )

        # Has thier been an exception?
        info.exception_details = cls.exception_details
        if info.exception_details != (None,None):
          print 'Exception details', info.exception_details
          info.return_code = -1

        # Write to SimulationDataBase

        # Save the information to a database:
        SimulationDBWriter.write_to_database(info)


    @classmethod
    def top_level_exception_handler(cls, exception_type, exception,
traceback, *args):
        print 'TopLevel Exception Handler'
        cls.exception_details  = exception_type, exception, traceback

    @classmethod
    def Init(cls, time_out=None):
        assert not cls.is_initialised

        if 'MF_TIMEOUT' in os.environ:
            timeout = int( os.environ['MF_TIMEOUT'] )


        # Filename of the Simulation script
        cwd = os.getcwd()
        cls.script_name = os.path.join( cwd, traceback.extract_stack()
[0][0] )
        #cls.script_name = traceback.extract_stack()[0][2].
        #cls.script_name = inspect.stack()[-1][1]

        #Intercept StdOut and StdErr:
        cls.std_out = cStringIO.StringIO()
        sys.stdout = IOStreamDistributor( [cls.std_out, sys.stdout] )
        cls.std_err = cStringIO.StringIO()
        sys.stderr = IOStreamDistributor( [cls.std_err, sys.stderr] )

        # Set an exit handler and a top level exception-handler
        # Set a top level exception handler:
        atexit.register( cls.exit_handler )
        sys.excepthook = cls.top_level_exception_handler


        # Set a time-out alarm
        cls.start_time = time.time()
        cls.time_out = time_out



From wescpy at gmail.com  Tue Sep 27 10:00:55 2011
From: wescpy at gmail.com (wesley chun)
Date: Tue, 27 Sep 2011 11:00:55 -0300
Subject: ANN: Intro+Intermediate Python course, SF, Oct 18-20
In-Reply-To: <CAB6eaA5LA5V5F11m1vbCcxW=1x2anhN101jcF6tGYZboxscN_Q@mail.gmail.com>
References: <CAB6eaA5LA5V5F11m1vbCcxW=1x2anhN101jcF6tGYZboxscN_Q@mail.gmail.com>
Message-ID: <CAB6eaA7zdU1siY-2RodTNr4eE_McAEew=2DoGCqwFCa2a-15OQ@mail.gmail.com>

** FINAL CALL **

http://sfbay.craigslist.org/sfc/cls/2495963854.html


---------- Forwarded message ----------
From: wesley chun <wescpy at gmail.com>
Date: Mon, Jul 25, 2011 at 12:32 PM
Subject: ANN: Intro+Intermediate Python course, SF, Oct 18-20

Need to get up-to-speed with Python as quickly and as in-depth as
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intro/intermediate course coming up this May in Northern California,
then enjoy a beautiful Fall weekend afterwards in San Francisco, the
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Please pass on this note to whomever you think may be interested. I
look forward to meeting you and your colleagues! Feel free to pass
around the PDF flyer linked down below. Write if you have questions.

Since I hate spam, I'll only send out one reminder as the date gets
closer.

(Comprehensive) Intro+Intermediate Python
Tue-Thu, 2011 Oct 18-20, 9am-5pm

Hope to meet you soon!
-Wesley

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Although this course may appear to those new to Python, it is also
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We will immerse you in the world of Python in only a few days, showing
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PREVIEW 1: you will find (and can download) a video clip of a
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will give you an idea of lecture style as well as an overview of the
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covered in the course.

info:http://www.safaribooksonline.com/events/WhatIsPython.html
download (reg req'd):
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    http://corepython.com

wesley.chun : wescpy-gmail.com : @wescpy
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com
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From taleinat at gmail.com  Tue Sep 27 10:24:12 2011
From: taleinat at gmail.com (Tal Einat)
Date: Tue, 27 Sep 2011 07:24:12 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
In-Reply-To: <abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
Message-ID: <13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>

I don't work with SAS so I have no reason to invest any time developing for it.

Also, as far as I can tell, SAS is far from free or open-source, meaning I definitely am not interested in developing for it.

My library solves a problem for which there is no existing solution in the world of Python programming, AFAIK. I'm certainly not surprised such solutions already exist in other computing environments, but that's not relevant for me.


From robert.kern at gmail.com  Tue Sep 27 11:49:47 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 27 Sep 2011 11:49:47 -0400
Subject: Wrote a new library - Comments and suggestions please!
In-Reply-To: <13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
Message-ID: <j5srar$dfl$1@dough.gmane.org>

On 9/27/11 10:24 AM, Tal Einat wrote:
> I don't work with SAS so I have no reason to invest any time developing for it.
>
> Also, as far as I can tell, SAS is far from free or open-source, meaning I definitely am not interested in developing for it.

I don't think he's suggesting that you drop what you are doing in Python and 
start working with SAS. He is suggesting that you look at the similar procedures 
that exist in the SAS standard library for inspiration.

-- 
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  Tue Sep 27 11:52:13 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 27 Sep 2011 11:52:13 -0400
Subject: QA Engineering/ Python/ Contract/ Austin, TX
In-Reply-To: <CAMZYqRRq6ymmAiJqD+UN10z+aysEmQd1t_FP4MEDj4rE_Bz=JQ@mail.gmail.com>
References: <b5423e70-f484-48c7-8398-51be899b4925@12g2000vbu.googlegroups.com>
	<CAMZYqRRq6ymmAiJqD+UN10z+aysEmQd1t_FP4MEDj4rE_Bz=JQ@mail.gmail.com>
Message-ID: <j5srfd$d8c$1@dough.gmane.org>

On 9/26/11 5:03 PM, Chris Rebert wrote:
> On Mon, Sep 26, 2011 at 1:56 PM, TOM<tgugger at bex.net>  wrote:
>> Tom Gugger
>> Independent Recruiter
>> tgugger at bex.net
>>
>> US Citizens or Greencard
>> On Site
>>
>>
>> QA Engineering/ Python/ Contract/ Austin, TX
>>
>> This is an immediate start, such as next week. I need three
>> contractors
>
> Such postings belong on the Python jobs board
> (http://www.python.org/community/jobs/ ), not
> python-list/comp.lang.python.

While he should definitely also post to the Jobs Board, job postings have 
usually been welcomed on python-list provided that they are relevant and not too 
spammy. Using [JOB] in the Subject line also helps.

-- 
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  Tue Sep 27 11:59:09 2011
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 27 Sep 2011 11:59:09 -0400
Subject: atexit handlers - getting the return code
In-Reply-To: <bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
	<mailman.1497.1317128120.27778.python-list@python.org>
	<bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>
Message-ID: <j5srsd$he8$1@dough.gmane.org>

On 9/27/11 9:37 AM, Mike Hull wrote:
> Hi Giampaolo,
> Sorry, I didn't explain very clearly.
> I have a python file, 'simulation_logger.py', (given below).
> Then, in my scripts, I add the following lines to the top,
>
>
>
> #simulation1.py:
> ###################
> from simulation_logger  import SimulationDecorator
> SimulationDecorator.Init()
>
> # Rest of the simulation script....
>
> #####################
>
> and at the end of the simulation, it should write the stdout/stderr,
> the return code and any top level exception details into a database.
> This is working except I can't work out how to get the return code
> the script is going to return.

I don't think that's available inside the process. You may want to use a 
"runner" script that records this information. Additionally, the runner script 
could record the stdout/stderr information more cleanly than stubbing out 
sys.stdout/sys.stderr. For example, if you have C or Fortran modules that use 
their own mechanisms to print things directly to the STDOUT/STDERR file 
descriptors, your sys.stdout/sys.stderr stubs will never be informed about it. 
However, if the runner script directs stdout/stderr to a pipe, it can read every 
bit of text that gets printed. Timing is probably also best recorded by the 
runner script to record the startup overhead of the Python interpreter. Continue 
to use the SimulationDecorator to record the traceback information, though.

-- 
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 sakthi92 at gmail.com  Tue Sep 27 13:21:24 2011
From: sakthi92 at gmail.com (sakthi)
Date: Tue, 27 Sep 2011 10:21:24 -0700 (PDT)
Subject: Multiplication error in python
Message-ID: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>

In the following code,
>>> l=[1,2,3,4,5]
>>> i=0
>>> for a in l:
...     p=2*a
...     t=p+i
...     i=t
...
>>> t
45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.


From steve+comp.lang.python at pearwood.info  Tue Sep 27 13:33:13 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Wed, 28 Sep 2011 03:33:13 +1000
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
Message-ID: <4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>

Robert Kern wrote:

> On 9/27/11 10:24 AM, Tal Einat wrote:
>> I don't work with SAS so I have no reason to invest any time developing
>> for it.
>>
>> Also, as far as I can tell, SAS is far from free or open-source, meaning
>> I definitely am not interested in developing for it.
> 
> I don't think he's suggesting that you drop what you are doing in Python
> and start working with SAS. He is suggesting that you look at the similar
> procedures that exist in the SAS standard library for inspiration.

Yeah, inspiration on what *not* to do.

I googled on "SAS PROC FREQ" and found this:

http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/default/procstat_freq_sect006.htm

All the words are in English, but I have no idea what the function does, how
you would call it, and what it returns. Would it have been so hard to show
a couple of examples?

Documentation like that really makes me appreciate the sterling work done on
Python's docs.

This tutorial:

http://www2.sas.com/proceedings/sugi30/263-30.pdf

is much clearer.



-- 
Steven



From gherron at digipen.edu  Tue Sep 27 13:41:02 2011
From: gherron at digipen.edu (Gary Herron)
Date: Tue, 27 Sep 2011 10:41:02 -0700
Subject: Multiplication error in python
In-Reply-To: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <4E820AAE.2000405@digipen.edu>

On 09/27/2011 10:21 AM, sakthi wrote:
> In the following code,
>>>> l=[1,2,3,4,5]
>>>> i=0
>>>> for a in l:
> ...     p=2*a
> ...     t=p+i
> ...     i=t
> ...
>>>> t
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.

I think it's most likely you've made an error here.  Running your exact 
lines in Python gives the expected result:
 >>> l=[1,2,3,4,5]
 >>> i=0
 >>> for a in l:
   ...   p=2*a
   ...   t=p+i
   ...   i=t
   ...
 >>> t
   30

Please try again.  If you can reproduce the incorrect result -- then we 
have a real bug.  However, the chance of that is really really tiny.

Gary Herron






-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418



From pruebauno at latinmail.com  Tue Sep 27 13:42:02 2011
From: pruebauno at latinmail.com (nn)
Date: Tue, 27 Sep 2011 10:42:02 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <4082eb5c-9374-4409-a007-1133eb13bb36@i28g2000yqn.googlegroups.com>

On Sep 27, 1:21?pm, sakthi <sakth... at gmail.com> wrote:
> In the following code,>>> l=[1,2,3,4,5]
> >>> i=0
> >>> for a in l:
>
> ... ? ? p=2*a
> ... ? ? t=p+i
> ... ? ? i=t
> ...>>> t
>
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.

You must be doing something different than these steps:

Python 3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> l=[1,2,3,4,5]
>>> i=0
>>> for a in l:
	p=2*a
	t=p+i
	i=t


>>> t
30
>>>


From contato at abruno.com  Tue Sep 27 13:42:20 2011
From: contato at abruno.com (Alysson Bruno (WebSite))
Date: Tue, 27 Sep 2011 14:42:20 -0300
Subject: Multiplication error in python
In-Reply-To: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <CADUW+MkP8UONvJ79NK5vpTN6EiCLiq0+G8P6Deocn_+ag55dWA@mail.gmail.com>

In my python 3.2, no problem:

>>> l=[1,2,3,4,5]
>>> i=0
>>> for a in l:
...   p=2*a
...   t=p+i
...   i=t
...   print("p={}, t={}, i={}".format(p,t,i))
...
p=2, t=2, i=2
p=4, t=6, i=6
p=6, t=12, i=12
p=8, t=20, i=20
p=10, t=30, i=30
>>> t
30
>>>

paz e amor (love and peace),

Alysson Bruno
Palmas(TO)
Brasil

http://abruno.com

Leia: Heo Sargila: Hist?ria da Cria??o:
http://heosargila.blogspot.com/2011/09/historia-da-criacao.html



2011/9/27 sakthi <sakthi92 at gmail.com>

> In the following code,
> >>> l=[1,2,3,4,5]
> >>> i=0
> >>> for a in l:
> ...     p=2*a
> ...     t=p+i
> ...     i=t
> ...
> >>> t
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From bex.lewis at gmail.com  Tue Sep 27 13:43:00 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 27 Sep 2011 10:43:00 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <4dfd3a08-d5df-48a2-91d1-95a2a0f79c3e@j19g2000yqc.googlegroups.com>

I tried running your code in ipython:

In [1]: l = [1,2,3,4,5]
In [2]: i = 0
In [3]: for a in l:
   ...:     p = 2 * a
   ...:     t = p + i
   ...:     i = t
   ...:
In [4]:
In [4]: t
Out[4]: 30

The output from Python was 30, not 45. What Python version are you
running?

On Sep 27, 6:21?pm, sakthi <sakth... at gmail.com> wrote:

> In the following code,>>> l=[1,2,3,4,5]
> >>> i=0
> >>> for a in l:
>
> ... ? ? p=2*a
> ... ? ? t=p+i
> ... ? ? i=t
> ...>>> t
>
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.



From clp2 at rebertia.com  Tue Sep 27 13:43:22 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 27 Sep 2011 10:43:22 -0700
Subject: Multiplication error in python
In-Reply-To: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <CAMZYqRQCtXsyvVsxiBVXROQHQzaiBjLR4JbTJQabKMzq1H-U=w@mail.gmail.com>

On Tue, Sep 27, 2011 at 10:21 AM, sakthi <sakthi92 at gmail.com> wrote:
> In the following code,
>>>> l=[1,2,3,4,5]
>>>> i=0
>>>> for a in l:
> ... ? ? p=2*a
> ... ? ? t=p+i
> ... ? ? i=t
> ...
>>>> t
> 45
>
> Python gives an answer as 45. But i am getting 30 when i execute
> manually. Is there any different multiplication pattern in python?
> Thank yu.

My Python gives 30; methinks perhaps you've elided some important part
of your code.
Also, I note that your loop body can be significantly simplified to
just: i += 2*a

Cheers,
Chris
--
http://rebertia.com


From sakthi92 at gmail.com  Tue Sep 27 13:50:23 2011
From: sakthi92 at gmail.com (sakthi)
Date: Tue, 27 Sep 2011 10:50:23 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<mailman.1504.1317145412.27778.python-list@python.org>
Message-ID: <2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>

On Sep 27, 1:43?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Sep 27, 2011 at 10:21 AM, sakthi <sakth... at gmail.com> wrote:
> > In the following code,
> >>>> l=[1,2,3,4,5]
> >>>> i=0
> >>>> for a in l:
> > ... ? ? p=2*a
> > ... ? ? t=p+i
> > ... ? ? i=t
> > ...
> >>>> t
> > 45
>
> > Python gives an answer as 45. But i am getting 30 when i execute
> > manually. Is there any different multiplication pattern in python?
> > Thank yu.
>
> My Python gives 30; methinks perhaps you've elided some important part
> of your code.
> Also, I note that your loop body can be significantly simplified to
> just: i += 2*a
>
> Cheers,
> Chris
> --http://rebertia.com

if i put i += 2*a it returns 155.


From bex.lewis at gmail.com  Tue Sep 27 14:51:06 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 27 Sep 2011 11:51:06 -0700 (PDT)
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<mailman.1504.1317145412.27778.python-list@python.org>
	<2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>
Message-ID: <b904f32a-4354-43d2-893b-1fc1b3c5c17a@p11g2000yqe.googlegroups.com>

I think you may be doing something wrong.

If I run:
>>> l = [1, 2, 3, 4, 5]
>>> i = 0
>>> for a in l:
    ...    i += 2 * a
    ...
>>> i
 30

The result is 30 as expected.

Nowhere near the 155 that you are getting. :/

Again, could you state which version of python are you using (and what
OS) so that we can run the code in the same environment as you.

Becky Lewis


>
> > > Python gives an answer as 45. But i am getting 30 when i execute
> > > manually. Is there any different multiplication pattern in python?
> > > Thank yu.
>
> > My Python gives 30; methinks perhaps you've elided some important part
> > of your code.
> > Also, I note that your loop body can be significantly simplified to
> > just: i += 2*a
>
> > Cheers,
> > Chris
> > --http://rebertia.com
>
> if i put i += 2*a it returns 155.



From mikehulluk at googlemail.com  Tue Sep 27 15:12:09 2011
From: mikehulluk at googlemail.com (Mike Hull)
Date: Tue, 27 Sep 2011 12:12:09 -0700 (PDT)
Subject: atexit handlers - getting the return code
References: <f03daf50-402b-400f-9bc3-187f83ca010b@n12g2000yqh.googlegroups.com>
	<mailman.1497.1317128120.27778.python-list@python.org>
	<bc3c647b-45a3-4424-b2d8-1499a37a85a5@c1g2000yql.googlegroups.com>
	<mailman.1503.1317139208.27778.python-list@python.org>
Message-ID: <662ee8e4-34af-42aa-b01b-edace3af133d@20g2000yqq.googlegroups.com>

On Sep 27, 4:59?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 9/27/11 9:37 AM, Mike Hull wrote:
>
>
>
>
>
>
>
>
>
> > Hi Giampaolo,
> > Sorry, I didn't explain very clearly.
> > I have a python file, 'simulation_logger.py', (given below).
> > Then, in my scripts, I add the following lines to the top,
>
> > #simulation1.py:
> > ###################
> > from simulation_logger ?import SimulationDecorator
> > SimulationDecorator.Init()
>
> > # Rest of the simulation script....
>
> > #####################
>
> > and at the end of the simulation, it should write the stdout/stderr,
> > the return code and any top level exception details into a database.
> > This is working except I can't work out how to get the return code
> > the script is going to return.
>
> I don't think that's available inside the process. You may want to use a
> "runner" script that records this information. Additionally, the runner script
> could record the stdout/stderr information more cleanly than stubbing out
> sys.stdout/sys.stderr. For example, if you have C or Fortran modules that use
> their own mechanisms to print things directly to the STDOUT/STDERR file
> descriptors, your sys.stdout/sys.stderr stubs will never be informed about it.
> However, if the runner script directs stdout/stderr to a pipe, it can read every
> bit of text that gets printed. Timing is probably also best recorded by the
> runner script to record the startup overhead of the Python interpreter. Continue
> to use the SimulationDecorator to record the traceback information, though.
>
> --
> 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

Hi Robert,
Thanks for this. The return code is not super important at this stage,
but I thought I would
try and get everything working neatly. Creating a separate runner
script is probably the way
to go. If i get some time I will implement it like that. My reason for
wanting to do it 'in
the same script' was that I also have another library that intercepts
calls to matplotlib's show(),
so I could ultimately create a pdf containing the script with figures
interjected at the right place.
Anyway, I will have to think about that some more.

Thanks again!

Mike



From mwilson at the-wire.com  Tue Sep 27 15:12:20 2011
From: mwilson at the-wire.com (Mel)
Date: Tue, 27 Sep 2011 15:12:20 -0400
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j5t76i$k2e$1@speranza.aioe.org>

Steven D'Aprano wrote:
> I googled on "SAS PROC FREQ" and found this:
> 
http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/default/procstat_freq_sect006.htm
> 
> All the words are in English, but I have no idea what the function does,
> how you would call it, and what it returns. Would it have been so hard to
> show a couple of examples?

Hmm.  Yeah.  Very much so.  That's the kind of documentation I call "syntax 
happy".  It tells you how to create a well-formed PROC STAT without ever 
saying what would happen if you did, or why you might want that, whatever it 
was, to happen.  I see that kind of documentation way too often.  By 
comparison, even this <https://www.ubersoft.net/comic/hd/2011/09/losing-
sight-big-picture> might seem good.  At least they try.

"Does things to the stuff.  By default, the most recent stuff is done things 
to."

	Mel.



From tundra at tundraware.com  Tue Sep 27 15:12:33 2011
From: tundra at tundraware.com (Tim Daneliuk)
Date: Tue, 27 Sep 2011 14:12:33 -0500
Subject: Multiplication error in python
In-Reply-To: <2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<mailman.1504.1317145412.27778.python-list@python.org>
	<2087b307-537c-4d01-9527-bcf04cc2449b@p11g2000yqe.googlegroups.com>
Message-ID: <1qj9l8-t6b.ln1@ozzie.tundraware.com>

On 9/27/2011 12:50 PM, sakthi said this:
> On Sep 27, 1:43 pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Tue, Sep 27, 2011 at 10:21 AM, sakthi <sakth... at gmail.com> wrote:
>>> In the following code,
>>>>>> l=[1,2,3,4,5]
>>>>>> i=0
>>>>>> for a in l:
>>> ...     p=2*a
>>> ...     t=p+i
>>> ...     i=t
>>> ...
>>>>>> t
>>> 45
>>
>>> Python gives an answer as 45. But i am getting 30 when i execute
>>> manually. Is there any different multiplication pattern in python?
>>> Thank yu.
>>
>> My Python gives 30; methinks perhaps you've elided some important part
>> of your code.
>> Also, I note that your loop body can be significantly simplified to
>> just: i += 2*a
>>
>> Cheers,
>> Chris
>> --http://rebertia.com
> 
> if i put i += 2*a it returns 155.

Are you sure you don't have something indented incorrectly?

How about a plain text copy of your program (without the interactive
stuff) so we can run it independently...


-- 
------------------------------------------------------------------------
Tim Daneliuk
tundra at tundraware.com


From joncle at googlemail.com  Tue Sep 27 15:54:22 2011
From: joncle at googlemail.com (Jon Clements)
Date: Tue, 27 Sep 2011 12:54:22 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <65466670-d990-4d7c-9cca-0ac3ec9881a6@db5g2000vbb.googlegroups.com>

On Sep 27, 6:33?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Robert Kern wrote:
> > On 9/27/11 10:24 AM, Tal Einat wrote:
> >> I don't work with SAS so I have no reason to invest any time developing
> >> for it.
>
> >> Also, as far as I can tell, SAS is far from free or open-source, meaning
> >> I definitely am not interested in developing for it.
>
> > I don't think he's suggesting that you drop what you are doing in Python
> > and start working with SAS. He is suggesting that you look at the similar
> > procedures that exist in the SAS standard library for inspiration.
>
> Yeah, inspiration on what *not* to do.
>
> I googled on "SAS PROC FREQ" and found this:
>
> http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/defau...
>
> All the words are in English, but I have no idea what the function does, how
> you would call it, and what it returns. Would it have been so hard to show
> a couple of examples?
>
> Documentation like that really makes me appreciate the sterling work done on
> Python's docs.
>
> This tutorial:
>
> http://www2.sas.com/proceedings/sugi30/263-30.pdf
>
> is much clearer.
>
> --
> Steven

Yes - I definitely do not like the SAS docs - in fact, when I last had
to "buy" the product, it was something like ?5k for the "BASE" system,
then if I wanted ODBC it was another ?900, and the "proper" manuals
were something stupid like another ?1k (and only in hard copy) - this
was a good 5/6 years ago though... (oh, and for a very basic course,
it was ?1.2k a day for staff to train) *sighs* [oh, and if I wanted a
'site' licence, we were talking 6 digits]

Anyway, Robert Kern correctly interpreted me. I was not suggesting to
the OP that he move to SAS (heaven forbid), I was indeed suggesting
that he look into what similar systems have (that I have experience
with and appreciate), and he acknowledges that is not present in
Python, and ummm, take inspiration and quite possibly "rip 'em off".

A decent tabulate/cross-tabulation and statistics related there-to
library is something I'd be willing to assist with and put time into.

Cheers,

Jon.





From rantingrick at gmail.com  Tue Sep 27 16:45:52 2011
From: rantingrick at gmail.com (rantingrick)
Date: Tue, 27 Sep 2011 13:45:52 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
Message-ID: <8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>

On Sep 27, 1:51?am, DevPlayer <devpla... at gmail.com> wrote:
> By the way OP Passiday the title of the topic is "Suggested coding
> style".
>
> Are you suggesting a coding style or asking for a Python coding style
> or are you asking what IS the Python coding style.
>
> If you are asking what is the Python coding style. Google The Zen of
> Python. It's pretty much the dictum of coding style and referred to
> alot by many Pythoneers.

The Python zen is a very general outline of our collective religious
beliefs concerning programming (and it could be applied to many
fields). Every Python programmer should know the zen by heart. Which
can be very beneficial in a war of words when some smart mouth decides
to quote the zen in an attempt to defeat you. Since, like the bible
the zen is self contradicting, any argument utilizing the zen can be
defeated utilizing the zen.

If however you want to learn about the accepted rules for formatting
code then you need to read "PEP-8"! PEP 8 is our style guide. It is
not perfect as i have pointed out on many occasions HOWEVER it is the
only thing we have that keeps multiplicity from reproducing like
leporidae.

  http://www.python.org/dev/peps/pep-0008/


From wanderer at dialup4less.com  Tue Sep 27 16:54:48 2011
From: wanderer at dialup4less.com (Wanderer)
Date: Tue, 27 Sep 2011 13:54:48 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
Message-ID: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>

How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says

"Python 2.6.6 has been replaced by a newer security-fix only source
release of Python. Please download Python 2.6.7 instead."

But there is no windows installer on the 2.6.7 page. Do I install
2.6.6 first and then update to 2.6.7?

Thanks


From arnodel at gmail.com  Tue Sep 27 17:11:58 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Tue, 27 Sep 2011 22:11:58 +0100
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
Message-ID: <CAJ6cK1Z-5fZmOjoZsRPMhu_-gzPh7pMwMYcE+2J++o17Xuw9Pw@mail.gmail.com>

On 27 September 2011 21:54, Wanderer <wanderer at dialup4less.com> wrote:
> How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> "Python 2.6.6 has been replaced by a newer security-fix only source
> release of Python. Please download Python 2.6.7 instead."
>
> But there is no windows installer on the 2.6.7 page. Do I install
> 2.6.6 first and then update to 2.6.7?

I don't know if it would suite your needs but there's ActivePython -
they provide an installer for 2.6.7

http://www.activestate.com/activepython/downloads

HTH

-- 
Arnaud


From brian.curtin at gmail.com  Tue Sep 27 17:17:45 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Tue, 27 Sep 2011 16:17:45 -0500
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
Message-ID: <CAD+XWwqy=4-bk5nA6BLLg8Ei0kEc39CdE0o1F1BPSRa0rf57tg@mail.gmail.com>

On Tue, Sep 27, 2011 at 15:54, Wanderer <wanderer at dialup4less.com> wrote:
> How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> "Python 2.6.6 has been replaced by a newer security-fix only source
> release of Python. Please download Python 2.6.7 instead."
>
> But there is no windows installer on the 2.6.7 page. Do I install
> 2.6.6 first and then update to 2.6.7?

As the text states, 2.6.7 is only a source code release. 2.6.6 is the
last binary package available, but if you need what's in 2.6.7, you
will have to compile the source yourself.

Alternatively, you could upgrade to 2.7 as 2.6 will continue to only
receive security fixes, or as Arnaud states, you could use an
alternative distribution to get 2.6.6.


From bex.lewis at gmail.com  Tue Sep 27 17:19:33 2011
From: bex.lewis at gmail.com (becky_lewis)
Date: Tue, 27 Sep 2011 14:19:33 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
Message-ID: <42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>

On Sep 27, 9:54?pm, Wanderer <wande... at dialup4less.com> wrote:
> How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> "Python 2.6.6 has been replaced by a newer security-fix only source
> release of Python. Please download Python 2.6.7 instead."
>
> But there is no windows installer on the 2.6.7 page. Do I install
> 2.6.6 first and then update to 2.6.7?
>
> Thanks

Hi,

is there any reason that you specifically need the 2.6 branch or would
it be possible to update to 2.7?

As someone else already pointed out, there's the ActivePython route if
you really need 2.6.7.


From wanderer at dialup4less.com  Tue Sep 27 17:32:43 2011
From: wanderer at dialup4less.com (Wanderer)
Date: Tue, 27 Sep 2011 14:32:43 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
Message-ID: <1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>

On Sep 27, 5:19?pm, becky_lewis <bex.le... at gmail.com> wrote:
> On Sep 27, 9:54?pm, Wanderer <wande... at dialup4less.com> wrote:
>
> > How do I install Python 2.6.7 on Windows? The Python 2.6.6 page says
>
> > "Python 2.6.6 has been replaced by a newer security-fix only source
> > release of Python. Please download Python 2.6.7 instead."
>
> > But there is no windows installer on the 2.6.7 page. Do I install
> > 2.6.6 first and then update to 2.6.7?
>
> > Thanks
>
> Hi,
>
> is there any reason that you specifically need the 2.6 branch or would
> it be possible to update to 2.7?
>
> As someone else already pointed out, there's the ActivePython route if
> you really need 2.6.7.

I need to stay in sink with the rest of the company which is still
using 2.6 flavors. There was some investigation into going to Python 3
but not enough of the libraries we use were available. I'll install
2.6.6. I don't think the security stuff really effects me. I think it
is strange to release a security update but not really expect people
to use it.


From iamforufriends at gmail.com  Tue Sep 27 18:02:21 2011
From: iamforufriends at gmail.com (hot girl)
Date: Tue, 27 Sep 2011 15:02:21 -0700 (PDT)
Subject: hai date with girl for free
Message-ID: <1239dc58-6fcd-4f7d-8795-1907e08af831@j10g2000vbb.googlegroups.com>

want a gf for dating

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas

http://tinyurl.com/3bj2zas


From aljosa.mohorovic at gmail.com  Tue Sep 27 18:54:37 2011
From: aljosa.mohorovic at gmail.com (Aljosa Mohorovic)
Date: Tue, 27 Sep 2011 15:54:37 -0700 (PDT)
Subject: oauth2 server implementation
Message-ID: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>

i'm looking for oauth2 server implementation but other than
https://github.com/simplegeo/python-oauth2 (oauth v1 implementation)
it doesn't seem that people are using v2 implementations.
anybody using some oauth2 implementation and can share some info?


Aljosa Mohorovic


From brian.curtin at gmail.com  Tue Sep 27 18:59:35 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Tue, 27 Sep 2011 17:59:35 -0500
Subject: PyCon 2012 Proposals Due October 12
Message-ID: <CAD+XWwqJapzt-9L=Tyb5K4vdh8AzJSyru3u4nKSXCEdOJAjDAA@mail.gmail.com>

The deadline for PyCon 2012 tutorial, talk, and poster proposals is
under 15 days away, so be sure to get your submissions in by October
12, 2011. Whether you?re a first-timer or an experienced veteran,
PyCon is depends on you, the community, coming together to build the
best conference schedule possible. Our
call for proposals (http://us.pycon.org/2012/cfp/) lays out the
details it takes to be included in the lineup for the conference in
Santa Clara, CA on March 7-15, 2012.

If you?re unsure of what to write about, our recent survey yielded a
large list of potential talk topics
(http://pycon.blogspot.com/2011/09/need-talk-ideas.html), and plenty
of ideas for tutorials (INSERT TUTORIAL POST). We?ve also come up with
general tips on proposal writing at
http://pycon.blogspot.com/2011/08/writing-good-proposal.html to ensure
everyone has the most complete proposal when it comes time for review.
As always, the program committee wants to put together an incredible
conference, so they?ll be working with submitters to fine tune
proposal details and help you produce the best submissions.

We?ve had plenty of great news to share since we first announced the
call for proposals. Paul Graham of Y Combinator was recently announced
as a keynote speaker
(http://pycon.blogspot.com/2011/09/announcing-first-pycon-2012-keynote.html),
making his return after a 2003 keynote. David Beazley, famous for his
mind-blowing talks on CPython?s Global Interpreter Lock, was added to
the plenary talk series
(http://pycon.blogspot.com/2011/09/announcing-first-pycon-2012-plenary.html).
Sponsors can now list their job openings on the ?Job Fair? section of
the PyCon site (http://pycon.blogspot.com/2011/09/announcing-pycon-2012-fair-page-sponsor.html).
We?re hard at work to bring you the best conference yet, so stay tuned
to PyCon news at http://pycon.blogspot.com/ and on Twitter at
https://twitter.com/#!/pycon.

We recently eclipsed last year?s sponsorship count of 40 and are
currently at a record 52 organizations supporting PyCon. If you or
your organization are interested in sponsoring PyCon, we?d love to
hear from you, so check out our sponsorship page
(http://us.pycon.org/2012/sponsors/).

A quick thanks to all of our awesome PyCon 2012 Sponsors:

- Diamond Level: Google and Dropbox.
- Platinum Level: New Relic, SurveyMonkey, Microsoft, Eventbrite,
Nasuni and Gondor.io
- Gold Level: Walt Disney Animation Studios, CCP Games, Linode,
Enthought, Canonical, Dotcloud, Loggly, Revsys, ZeOmega, Bitly,
ActiveState, JetBrains, Caktus, Disqus, Spotify, Snoball, Evite, and
PlaidCloud
- Silver Level: Imaginary Landscape, WiserTogether, Net-ng, Olark, AG
Interactive, Bitbucket, Open Bastion, 10Gen, gocept, Lex Machina,
fwix, github, toast driven, Aarki, Threadless, Cox Media, myYearBook,
Accense Technology, Wingware, FreshBooks, and BigDoor
- Lanyard: Dreamhost
- Sprints: Reddit
- FLOSS: OSU/OSL, OpenHatch


The PyCon Organizers - http://us.pycon.org/2012
Jesse Noller - Chairman - jnoller at python.org
Brian Curtin - Publicity Coordinator - brian at python.org


From gagsl-py2 at yahoo.com.ar  Tue Sep 27 19:52:55 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 27 Sep 2011 20:52:55 -0300
Subject: Error 'module' object has no attribute "_extension_registry" when
	cPickle is imported from an installed Python 2.7.1
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
Message-ID: <op.v2hrahhax6zn5v@lepton>

En Tue, 27 Sep 2011 06:08:54 -0300, Wong Wah Meng-R32813  
<r32813 at freescale.com> escribi?:

> Hello all,
>
> I encounter this issue whereby I am not able to load cPickle module into  
> the python I newly built. There is no issue when I load it right from  
> the folder where the python executable and libpython2.7.so is built.  
> However, it gives me this error when I load the same module using the  
> installed files (python and all its modules, shared library from default  
> /use/local folder that contains bin, lib, include sub-folders) from  
> "make install" command.
>
> Does anyone know why? Here is the error:-
>
> $ python
> Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import cPickle
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AttributeError: 'module' object has no attribute '_extension_registry'

Looking at cPickle.c, it imports the copy_reg module and then looks for  
its "_extension_registry" attribute. Maybe your copy_reg.py is broken, or  
you have another copy_reg.py hiding the standard one.

-- 
Gabriel Genellina



From roy at panix.com  Tue Sep 27 20:17:01 2011
From: roy at panix.com (Roy Smith)
Date: Tue, 27 Sep 2011 20:17:01 -0400
Subject: oauth2 server implementation
References: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>
Message-ID: <roy-E5FDBE.20170027092011@news.panix.com>

In article 
<4c93ff75-1d85-48ec-b6d1-b71f216c61ce at g33g2000yqc.googlegroups.com>,
 Aljosa Mohorovic <aljosa.mohorovic at gmail.com> wrote:

> i'm looking for oauth2 server implementation but other than
> https://github.com/simplegeo/python-oauth2 (oauth v1 implementation)
> it doesn't seem that people are using v2 implementations.
> anybody using some oauth2 implementation and can share some info?
> 
> 
> Aljosa Mohorovic

We rolled our own oauth2 client on top of basic urllib calls.  It's not 
terribly difficult.

Other than Twitter, I'm not aware of anybody still using oauth1.


From brian.curtin at gmail.com  Tue Sep 27 20:52:07 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Tue, 27 Sep 2011 19:52:07 -0500
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
Message-ID: <CAD+XWwoSsLug6iUajPPsR+GJ2uatNNXOsTDnpCTqOX+X33v82Q@mail.gmail.com>

On Tue, Sep 27, 2011 at 16:32, Wanderer <wanderer at dialup4less.com> wrote:

> I think it is strange to release a security update but not really expect
> people
> to use it.


We expect that people who need 2.6 but won't move to 2.7, and at the same
time are vulnerable to the security issue(s), would be able to compile
Python for themselves. Shortly after 2.7 was released, 2.6 went into
security-fix mode, and that's true of any X.Y and X.Y-1 pair.

For a look at how busy the release schedule has been at times, I wrote about
all of the releases we were up to in June at
http://blog.python.org/2011/06/june-releases-267-272-314.html. Consider the
fact that the person creating the installer usually creates at least three
installers for any release (usually two candidates, and the final - add in
alphas for a new X.Y), for each branch, of which three branches were having
binary installers produced.

For the specifics on the 2.6.7 fix,
http://blog.python.org/2011/04/urllib-security-vulnerability-fixed.html covers
it.
-------------- next part --------------
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From tjreedy at udel.edu  Tue Sep 27 20:56:49 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 27 Sep 2011 20:56:49 -0400
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
Message-ID: <j5trcm$65h$1@dough.gmane.org>

On 9/27/2011 5:32 PM, Wanderer wrote:

> I need to stay in sink with the rest of the company which is still
> using 2.6 flavors. There was some investigation into going to Python 3
> but not enough of the libraries we use were available. I'll install
> 2.6.6. I don't think the security stuff really effects me. I think it
> is strange to release a security update but not really expect people
> to use it.

It is used most, I presume, by security-conscious server people, 
especially *nix people, who expect to compile their own binary. The 
ordinary user is hardly affected by most of these issues.

-- 
Terry Jan Reedy



From wuwei23 at gmail.com  Tue Sep 27 22:22:49 2011
From: wuwei23 at gmail.com (alex23)
Date: Tue, 27 Sep 2011 19:22:49 -0700 (PDT)
Subject: Wrote a new library - Comments and suggestions please!
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <553f821c-58c1-4b81-817e-078c148af209@j19g2000yqc.googlegroups.com>

Steven D'Aprano <steve+comp.lang.pyt... at pearwood.info> wrote:
> I googled on "SAS PROC FREQ" and found this:
>
> http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/defau...
>
> All the words are in English, but I have no idea what the function does, how
> you would call it, and what it returns. Would it have been so hard to show
> a couple of examples?

I'm currently arms deep in converting a handful of randomisation
algorithms written in SAS into Python. Pretty much ALL of the magic
happens behind cryptic SAS calls like this. I'm having more success
reverse-engineering the _results_ they produce and building something
Pythonic and comprehensible.



From wuwei23 at gmail.com  Tue Sep 27 22:25:48 2011
From: wuwei23 at gmail.com (alex23)
Date: Tue, 27 Sep 2011 19:25:48 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
Message-ID: <d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>

rantingrick <rantingr... at gmail.com> wrote:
> Since, like the bible
> the zen is self contradicting, any argument utilizing the zen can be
> defeated utilizing the zen.

And like the Bible, the Zen was created by humans as a joke. If you're
taking it too seriously, that's your problem.

> If however you want to learn about the accepted rules for formatting
> code then you need to read "PEP-8"! PEP 8 is our style guide.

PEP 8 is the _standard library style guide_. There's a difference.

> It is
> not perfect as i have pointed out on many occasions HOWEVER it is the
> only thing we have that keeps multiplicity from reproducing like
> leporidae.

Yes, save us from multiplicity, variety and difference. Nothing good
comes from them anyway.



From steve+comp.lang.python at pearwood.info  Wed Sep 28 00:25:05 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 28 Sep 2011 04:25:05 GMT
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
Message-ID: <4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>

On Tue, 27 Sep 2011 14:32:43 -0700, Wanderer wrote:

> I need to stay in sink with the rest of the company which is still using
> 2.6 flavors. There was some investigation into going to Python 3 but not
> enough of the libraries we use were available. I'll install 2.6.6. I
> don't think the security stuff really effects me. I think it is strange
> to release a security update but not really expect people to use it.


More likely the person who builds the Windows installers just hasn't made 
a new release yet.

The Python development team is relatively small and chronically busy: too 
much to do and not enough time to do it. As I understand it, most of them 
use Linux, so I'm afraid that Windows sometimes takes a back seat. (At 
least it's not Mac OS, which is stuck riding in the boot of the car, or 
the other semi-supported OSes, which are on a skateboard desperately 
hanging onto the bumper trying not to be left behind.)

You could try installing from source, if you have the appropriate Windows 
development environment.



-- 
Steven


From timr at probo.com  Wed Sep 28 02:28:32 2011
From: timr at probo.com (Tim Roberts)
Date: Tue, 27 Sep 2011 23:28:32 -0700
Subject: Multiplication error in python
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
Message-ID: <cjf5875ftnqppihvpogguuippelco58nin@4ax.com>

sakthi <sakthi92 at gmail.com> wrote:

>In the following code,
>>>> l=[1,2,3,4,5]
>>>> i=0
>>>> for a in l:
>...     p=2*a
>...     t=p+i
>...     i=t
>...
>>>> t
>45
>
>Python gives an answer as 45. But i am getting 30 when i execute
>manually. Is there any different multiplication pattern in python?

My guess is that you actually typed
    p=3*a
instead of
    p=2*a

That produces 45.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From r32813 at freescale.com  Wed Sep 28 02:37:56 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Wed, 28 Sep 2011 06:37:56 +0000
Subject: Error 'module' object has no attribute "_extension_registry"
	when	cPickle is imported from an installed Python 2.7.1
In-Reply-To: <op.v2hrahhax6zn5v@lepton>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
	<op.v2hrahhax6zn5v@lepton>
Message-ID: <02EA6D704E30CE499C5071776509A925F598F9@039-SN1MPN1-003.039d.mgd.msft.net>

Thanks Gabriel,

Indeed, there is corrupted copy_reg.py file residing in my $PYTHONPATH folder, as opposed to the standard one from the installed package. Thanks a lot for your helps!

Regards,
Wah Meng

-----Original Message-----
From: python-list-bounces+wahmeng=freescale.com at python.org [mailto:python-list-bounces+wahmeng=freescale.com at python.org] On Behalf Of Gabriel Genellina
Sent: Wednesday, September 28, 2011 7:53 AM
To: python-list at python.org
Subject: Re: Error 'module' object has no attribute "_extension_registry" when cPickle is imported from an installed Python 2.7.1

En Tue, 27 Sep 2011 06:08:54 -0300, Wong Wah Meng-R32813  
<r32813 at freescale.com> escribi?:

> Hello all,
>
> I encounter this issue whereby I am not able to load cPickle module into  
> the python I newly built. There is no issue when I load it right from  
> the folder where the python executable and libpython2.7.so is built.  
> However, it gives me this error when I load the same module using the  
> installed files (python and all its modules, shared library from default  
> /use/local folder that contains bin, lib, include sub-folders) from  
> "make install" command.
>
> Does anyone know why? Here is the error:-
>
> $ python
> Python 2.7.1 (r271:86832, Sep 27 2011, 15:19:26) [C] on hp-ux11
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import cPickle
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AttributeError: 'module' object has no attribute '_extension_registry'

Looking at cPickle.c, it imports the copy_reg module and then looks for  
its "_extension_registry" attribute. Maybe your copy_reg.py is broken, or  
you have another copy_reg.py hiding the standard one.

-- 
Gabriel Genellina

-- 
http://mail.python.org/mailman/listinfo/python-list




From 1248283536 at qq.com  Wed Sep 28 03:24:13 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Wed, 28 Sep 2011 15:24:13 +0800
Subject: how to run in xp?
Message-ID: <tencent_668C2ABD4239059823E912BC@qq.com>

#coding:utf-8
import urllib
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'w')
    url='http://www.nasdaq.com/screening/companies- \  by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.urlopen(url).read()
    myfile.write(file)
    print ('ok',down)
    myfile.close()

it can run in ubuntu+python2.6 ,when it run in window xp+python32,the output is  
Traceback (most recent call last):
  File "C:\Python32\getcode.py", line 8, in <module>
    file=urllib.urlopen(url).read()
AttributeError: 'module' object has no attribute 'urlopen'

i change it into:
#coding:utf-8
import urllib.request
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'w')
    url='http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print ('ok',down)
    myfile.close()

the output is :
Traceback (most recent call last):
  File "C:\Python32\getcode.py", line 9, in <module>
    myfile.write(file)
TypeError: must be str, not bytes

how to make it run in xp+python32?
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From rosuav at gmail.com  Wed Sep 28 03:31:16 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 17:31:16 +1000
Subject: Multiplication error in python
In-Reply-To: <cjf5875ftnqppihvpogguuippelco58nin@4ax.com>
References: <d7c8528a-2444-4e16-bc2b-5bb7e9948c78@q13g2000vby.googlegroups.com>
	<cjf5875ftnqppihvpogguuippelco58nin@4ax.com>
Message-ID: <CAPTjJmo4sALojxu_p=Var3S5NMoEAs0h+SUWwNfj7MvOXtqmoA@mail.gmail.com>

On Wed, Sep 28, 2011 at 4:28 PM, Tim Roberts <timr at probo.com> wrote:
> My guess is that you actually typed
> ? ?p=3*a
> instead of
> ? ?p=2*a
>
> That produces 45.
>

Or alternatively, that you used an interactive Python environment and
didn't clear i between runs.

ChrisA


From __peter__ at web.de  Wed Sep 28 04:04:46 2011
From: __peter__ at web.de (Peter Otten)
Date: Wed, 28 Sep 2011 10:04:46 +0200
Subject: how to run in xp?
References: <tencent_668C2ABD4239059823E912BC@qq.com>
Message-ID: <j5uke7$ou8$1@dough.gmane.org>

=?gbk?B?ytjW6rT9zcM=?= wrote:

> #coding:utf-8
> import urllib
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies- \ 
>     by-industry.aspx?exchange='+down+'&render=download'
>     file=urllib.urlopen(url).read() myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> it can run in ubuntu+python2.6 ,when it run in window xp+python32,the
> output is Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 8, in <module>
>     file=urllib.urlopen(url).read()
> AttributeError: 'module' object has no attribute 'urlopen'
> 
> i change it into:
> #coding:utf-8
> import urllib.request
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> the output is :
> Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 9, in <module>
>     myfile.write(file)
> TypeError: must be str, not bytes
> 
> how to make it run in xp+python32?

The problem here is the switch from Python 2 to 3. Python 3 has some 
backwards-incompatible Syntax changes along with changes to classes and 
library organisation. The good news is that there's a tool, 2to3, that can 
handle most of these changes:

$ cat getcode.py
#coding:utf-8   
import urllib   
exchange=['NASDAQ','NYSE','AMEX'] 
for down in exchange:             
    myfile=open('./'+down,'wb')   
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download' 
    file=urllib.urlopen(url).read()                                                                    
    myfile.write(file)                                                                                 
    print 'ok', down
    myfile.close()
$ cp getcode.py getcode3.py
$ 2to3-3.2 getcode3.py -w
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
RefactoringTool: Refactored getcode3.py
--- getcode3.py (original)
+++ getcode3.py (refactored)
@@ -1,10 +1,10 @@
 #coding:utf-8
-import urllib
+import urllib.request, urllib.parse, urllib.error
 exchange=['NASDAQ','NYSE','AMEX']
 for down in exchange:
     myfile=open('./'+down,'wb')
     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
-    file=urllib.urlopen(url).read()
+    file=urllib.request.urlopen(url).read()
     myfile.write(file)
-    print 'ok', down
+    print('ok', down)
     myfile.close()
RefactoringTool: Files that were modified:
RefactoringTool: getcode3.py
$ cat getcode3.py
#coding:utf-8
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'wb')
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print('ok', down)
    myfile.close()
$ python3.2 getcode3.py
ok NASDAQ
ok NYSE
ok AMEX




From r32813 at freescale.com  Wed Sep 28 04:37:13 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Wed, 28 Sep 2011 08:37:13 +0000
Subject: python 2.7.1 built not supporting thread? 
In-Reply-To: <op.v2hrahhax6zn5v@lepton>
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
	<op.v2hrahhax6zn5v@lepton>
Message-ID: <02EA6D704E30CE499C5071776509A925F59952@039-SN1MPN1-003.039d.mgd.msft.net>


Hello there,

I couldn't detect this problem until I run my application that utilizes thread module in python that I just built on HP-UX 11.31 ia64 using aCC.

Could it be the build did not include enable thread option? _REENTRANT as stated in the README file? If yes, it looks like threading may not work "out of the box". 


>>> thread.start_new_thread(testing, ())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
thread.error: can't start new thread
>>>

Excerpts from README file for python 2.7 build

HP-UX:  When using threading, you may have to add -D_REENTRANT to the
        OPT variable in the top-level Makefile; reported by Pat Knight,
        this seems to make a difference (at least for HP-UX 10.20)
        even though pyconfig.h defines it. This seems unnecessary when
        using HP/UX 11 and later - threading seems to work "out of the
        box".

 



From xahlee at gmail.com  Wed Sep 28 05:28:38 2011
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 28 Sep 2011 02:28:38 -0700 (PDT)
Subject: question about speed of sequential string replacement vs regex or
Message-ID: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>

curious question.

suppose you have 300 different strings and they need all be replaced
to say "aaa".

is it faster to replace each one sequentially (i.e. replace first
string to aaa, then do the 2nd, 3rd,...)
, or is it faster to use a regex with ?or? them all and do replace one
shot? (i.e. "1ststr|2ndstr|3rdstr|..." -> aaa)

let's say the sourceString this replacement to be done on is 500k
chars.

Anyone? i suppose the answer will be similar for perl, python, ruby.

btw, the origin of this question is about writing a emacs lisp
function that replace ~250 html named entities to unicode char.

 Xah


From aljosa.mohorovic at gmail.com  Wed Sep 28 05:55:12 2011
From: aljosa.mohorovic at gmail.com (Aljosa Mohorovic)
Date: Wed, 28 Sep 2011 02:55:12 -0700 (PDT)
Subject: oauth2 server implementation
References: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>
	<roy-E5FDBE.20170027092011@news.panix.com>
Message-ID: <862e37e9-f4d2-4423-8d28-485923f1c76b@p11g2000yqe.googlegroups.com>

On Sep 28, 2:17?am, Roy Smith <r... at panix.com> wrote:
> We rolled our own oauth2 client on top of basic urllib calls. ?It's not
> terribly difficult.

i'm asking about oauth2 server implementation, not client.
it's easy to consume oauth2 stuff but what to do when you need to
implement server side stuff?

Aljosa


From rosuav at gmail.com  Wed Sep 28 06:04:43 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 20:04:43 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <CAPTjJmoirhp-1SLgzSV1=Yp_GpAdB1LD1mfco_UE2BMXivHYFQ@mail.gmail.com>

On Wed, Sep 28, 2011 at 7:28 PM, Xah Lee <xahlee at gmail.com> wrote:
> suppose you have 300 different strings and they need all be replaced
> to say "aaa".
>
> is it faster to replace each one sequentially

Before you ask "is it faster", you need to first be sure it's correct.
I would recommend doing all the replaces in a single function call to
avoid risk of overlaps or other issues causing problems.

ChrisA


From r32813 at freescale.com  Wed Sep 28 06:14:08 2011
From: r32813 at freescale.com (Wong Wah Meng-R32813)
Date: Wed, 28 Sep 2011 10:14:08 +0000
Subject: python 2.7.1 HP-UX 11 ia64 built not supporting thread 
References: <bf1b0dca-ebcc-47e4-90c5-2823cf7483b7@t16g2000yqm.googlegroups.com>
	<29893638.744.1317107871111.JavaMail.geo-discussion-forums@prfp13>
	<02EA6D704E30CE499C5071776509A925F593B8@039-SN1MPN1-003.039d.mgd.msft.net>
	<op.v2hrahhax6zn5v@lepton> 
Message-ID: <02EA6D704E30CE499C5071776509A925F599D0@039-SN1MPN1-003.039d.mgd.msft.net>

Hello there,

I included --with-threads option into the configure script calling, which it failed to add the -D_REENTRANT into Makefile. So I manually added this into OPT of the Makefile. I ran make again and generated a new python binary. However, the new binary is still not able to start a new thread from the thread module. 

I reviewed the config.log file, I think this failure has caused the build with threads failed. Cthreads.h header file is missing. Should this be included in my HP UX Compiler or it comes from python source? In python source I only found pythread.h. Anyway, I am only guessing what is wrong. 

Hope to hear some feedback here, whether this is something missing or a bug. 

configure:8407: checking for --with-threads
configure:8427: result: yes
configure:8484: checking for _POSIX_THREADS in unistd.h
configure:8503: result: yes
configure:8508: checking cthreads.h usability
configure:8508: cc +DD64 -I/home/r32813/local/include -c -g  conftest.c >&5
"conftest.c", line 128: error #3696-D: cannot open source file "cthreads.h"
  #include <cthreads.h>
                       ^
1 error detected in the compilation of "conftest.c".

| #define HAVE_LIBDLD 1
| #define _REENTRANT 1
| /* end confdefs.h.  */
| #include <cthreads.h>
configure:8508: result: no
configure:8508: checking for cthreads.h
configure:8508: result: no
configure:8521: checking mach/cthreads.h usability
configure:8521: cc +DD64 -I/home/r32813/local/include -c -g  conftest.c >&5
"conftest.c", line 128: error #3696-D: cannot open source file "mach/cthreads.h"
  #include <mach/cthreads.h>
                            ^

1 error detected in the compilation of "conftest.c".
configure:8521: $? = 2
configure: failed program was:
| /* confdefs.h */
| #define _GNU_SOURCE 1

| #define HAVE_LIBDLD 1
| #define _REENTRANT 1
| /* end confdefs.h.  */
| #include <mach/cthreads.h>
configure:8521: result: no
configure:8521: checking for mach/cthreads.h
configure:8521: result: no
configure:8533: checking for --with-pth
configure:8548: result: no
configure:8556: checking for pthread_create in -lpthread
configure:8572: cc +DD64 -I/home/r32813/local/include -o conftest -g  -L/home/r32813/local/lib -L/home/r32813/Build/2.7.1/Python-2.7.1 conftest.c -l
nsl -lrt -ldld -ldl  -lpthread >&5


Regards,
Wah Meng
Genesis Wafermap Support Ticket: 
To report a problem: http://dyno.freescale.net/Question/QuestionMain3.asp?location=zmy02&category=&tickettype=6820
To request a service: http://dyno.freescale.net/Question/Questionmain3.asp?location=74&category=2&tickettype=6819
Or if it is related to EWM or DSA: http://dyno.freescale.net/Question/Questionmain3.asp?location=ZMY02&tickettype=6539

-----Original Message-----
From: Wong Wah Meng-R32813 
Sent: Wednesday, September 28, 2011 4:37 PM
To: python-list at python.org
Subject: python 2.7.1 built not supporting thread? 


Hello there,

I couldn't detect this problem until I run my application that utilizes thread module in python that I just built on HP-UX 11.31 ia64 using aCC.

Could it be the build did not include enable thread option? _REENTRANT as stated in the README file? If yes, it looks like threading may not work "out of the box". 


>>> thread.start_new_thread(testing, ())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
thread.error: can't start new thread
>>>

Excerpts from README file for python 2.7 build

HP-UX:  When using threading, you may have to add -D_REENTRANT to the
        OPT variable in the top-level Makefile; reported by Pat Knight,
        this seems to make a difference (at least for HP-UX 10.20)
        even though pyconfig.h defines it. This seems unnecessary when
        using HP/UX 11 and later - threading seems to work "out of the
        box".

 



From merlyn at stonehenge.com  Wed Sep 28 06:57:44 2011
From: merlyn at stonehenge.com (Randal L. Schwartz)
Date: Wed, 28 Sep 2011 03:57:44 -0700
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <86bou553yv.fsf@red.stonehenge.com>

>>>>> "Xah" == Xah Lee <xahlee at gmail.com> writes:

Xah> curious question.
Xah> suppose you have 300 different strings and they need all be replaced
Xah> to say "aaa".

And then suppose this isn't the *real* question, but one entirely of
Fiction by Xah Lee.

How helpful do you want to be?

-- 
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn at stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
Smalltalk/Perl/Unix consulting, Technical writing, Comedy, etc. etc.
See http://methodsandmessages.posterous.com/ for Smalltalk discussion


From 1248283536 at qq.com  Wed Sep 28 07:50:04 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Wed, 28 Sep 2011 19:50:04 +0800
Subject: how to run in xp?
Message-ID: <tencent_3C36EA947F825BD94E8366FD@qq.com>

it can run ,but there is still a problem ,nothing in my file.
please run the code in xp+python32
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    url='http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    print (file)
what you get is:

>>> 
b''
b''
b''
>>> 

how to fix it?
------------------ Original ------------------
From:  "Peter Otten"<__peter__ at web.de>;
Date:  Wed, Sep 28, 2011 04:04 PM
To:  "python-list"<python-list at python.org>; 

Subject:  Re: how to run in xp?

 
=?gbk?B?ytjW6rT9zcM=?= wrote:

> #coding:utf-8
> import urllib
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies- \ 
>     by-industry.aspx?exchange='+down+'&render=download'
>     file=urllib.urlopen(url).read() myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> it can run in ubuntu+python2.6 ,when it run in window xp+python32,the
> output is Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 8, in <module>
>     file=urllib.urlopen(url).read()
> AttributeError: 'module' object has no attribute 'urlopen'
> 
> i change it into:
> #coding:utf-8
> import urllib.request
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> the output is :
> Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 9, in <module>
>     myfile.write(file)
> TypeError: must be str, not bytes
> 
> how to make it run in xp+python32?

The problem here is the switch from Python 2 to 3. Python 3 has some 
backwards-incompatible Syntax changes along with changes to classes and 
library organisation. The good news is that there's a tool, 2to3, that can 
handle most of these changes:

$ cat getcode.py
#coding:utf-8   
import urllib   
exchange=['NASDAQ','NYSE','AMEX'] 
for down in exchange:             
    myfile=open('./'+down,'wb')   
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download' 
    file=urllib.urlopen(url).read()                                                                    
    myfile.write(file)                                                                                 
    print 'ok', down
    myfile.close()
$ cp getcode.py getcode3.py
$ 2to3-3.2 getcode3.py -w
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
RefactoringTool: Refactored getcode3.py
--- getcode3.py (original)
+++ getcode3.py (refactored)
@@ -1,10 +1,10 @@
 #coding:utf-8
-import urllib
+import urllib.request, urllib.parse, urllib.error
 exchange=['NASDAQ','NYSE','AMEX']
 for down in exchange:
     myfile=open('./'+down,'wb')
     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
-    file=urllib.urlopen(url).read()
+    file=urllib.request.urlopen(url).read()
     myfile.write(file)
-    print 'ok', down
+    print('ok', down)
     myfile.close()
RefactoringTool: Files that were modified:
RefactoringTool: getcode3.py
$ cat getcode3.py
#coding:utf-8
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'wb')
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print('ok', down)
    myfile.close()
$ python3.2 getcode3.py
ok NASDAQ
ok NYSE
ok AMEX


-- 
http://mail.python.org/mailman/listinfo/python-list
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From devplayer at gmail.com  Wed Sep 28 08:12:31 2011
From: devplayer at gmail.com (DevPlayer)
Date: Wed, 28 Sep 2011 05:12:31 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
Message-ID: <ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>

On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
> rantingrick <rantingr... at gmail.com> wrote:
> > Since, like the bible
> > the zen is self contradicting, any argument utilizing the zen can be
> > defeated utilizing the zen.
>
> And like the Bible, the Zen was created by humans as a joke. If you're
> taking it too seriously, that's your problem.
>
> > If however you want to learn about the accepted rules for formatting
> > code then you need to read "PEP-8"! PEP 8 is our style guide.
>
Contradiction is only seen by narrow perspectve.

Calling the Bible a joke is used to hurt people, not enlighten them.
Those words show bitter arrogance, not constructive critism as it
ignores how others feel about that book. What benefit to others is
gained by calling someones belief a joke? To put the "believers" minds
straight? I think not. I think the unsensitive person who attackes
others beliefs, even if illogical or unrealistic, is after some kind
of self grandizement or to illude themself into thinking "they know
the truth of the universe" and should attack others to prove they do.

Although this is not the place to defend about such things it is also
not the place to attack those same things (that being someone's
faith). There is no real forum to defend a faith or religion, or words
in a book about that, other then where such faiths are in fact
attacked.

However I did laugh at the ironic use of using any-kind of zen to
seriously, even Python's, as that is very unzen-like. That is a
contradiction by it's very own definitions!


From xahlee at gmail.com  Wed Sep 28 08:28:01 2011
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 28 Sep 2011 05:28:01 -0700 (PDT)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
Message-ID: <4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>

On Sep 28, 3:57?am, mer... at stonehenge.com (Randal L. Schwartz) wrote:
> >>>>> "Xah" == Xah Lee <xah... at gmail.com> writes:
>
> Xah> curious question.
> Xah> suppose you have 300 different strings and they need all be replaced
> Xah> to say "aaa".
>
> And then suppose this isn't the *real* question, but one entirely of
> Fiction by Xah Lee.
>
> How helpful do you want to be?

it's a interesting question anyway.

the question originally came from when i was coding elisp of a
function that changes html entities to unicode char literal. The
problem is slightly complicated, involving a few questions about speed
in emacs. e.g. string vs buffer, and much more... i spent several
hours on this but it's probably too boring to detail (but i'll do so
if anyone wishes). But anyway, while digging these questions that's
not clear in my mind, i thought of why not generate a regex or
construct and do it in one shot, and wondered if that'd be faster. But
afterwards, i realized this wouldn't be applicable to my problem
because for my problem each string needs to be changed to a unique
string, not all to the same string.

 Xah


From michele.simionato at gmail.com  Wed Sep 28 08:45:27 2011
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 28 Sep 2011 05:45:27 -0700 (PDT)
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <mailman.1477.1317027357.27778.python-list@python.org>
References: <mailman.1477.1317027357.27778.python-list@python.org>
Message-ID: <29931044.1310.1317213927830.JavaMail.geo-discussion-forums@yqnk41>

plac is based on argparser and it is intended to be much easier to use. See
http://plac.googlecode.com/hg/doc/plac.html

Here is an example of usage.

$ cat vcs.py
class VCS(object):
    "A fictitious version control tool"
    commands = ['checkout', 'commit']
    def checkout(self, url):
        return 'ok'
    def commit(self):
        return 'ok'

if __name__ == '__main__':
    import plac; plac.Interpreter.call(VCS)

The line plac.Interpreter.call instantiates the VCS class by passing to it the arguments in the command line and then calls the appropriate method.

You can use the script as follows:

$ python vcs.py -h
usage: vcs.py [-h] [args [args ...]]

positional arguments:
  args

optional arguments:
  -h, --help  show this help message and exit

$ python vcs.py checkout url
ok
$ python vcs.py commit
ok
plac takes care of parsing the command line, giving the correct error message if you pass wrong arguments or not enough arguments:

$ python vcs.py checkout
usage:  checkout url
 checkout: error: too few arguments

plac can also be used to write command interpreters.


From michele.simionato at gmail.com  Wed Sep 28 08:45:27 2011
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 28 Sep 2011 05:45:27 -0700 (PDT)
Subject: Hierarchical commnd line parsing / help texts
In-Reply-To: <mailman.1477.1317027357.27778.python-list@python.org>
References: <mailman.1477.1317027357.27778.python-list@python.org>
Message-ID: <29931044.1310.1317213927830.JavaMail.geo-discussion-forums@yqnk41>

plac is based on argparser and it is intended to be much easier to use. See
http://plac.googlecode.com/hg/doc/plac.html

Here is an example of usage.

$ cat vcs.py
class VCS(object):
    "A fictitious version control tool"
    commands = ['checkout', 'commit']
    def checkout(self, url):
        return 'ok'
    def commit(self):
        return 'ok'

if __name__ == '__main__':
    import plac; plac.Interpreter.call(VCS)

The line plac.Interpreter.call instantiates the VCS class by passing to it the arguments in the command line and then calls the appropriate method.

You can use the script as follows:

$ python vcs.py -h
usage: vcs.py [-h] [args [args ...]]

positional arguments:
  args

optional arguments:
  -h, --help  show this help message and exit

$ python vcs.py checkout url
ok
$ python vcs.py commit
ok
plac takes care of parsing the command line, giving the correct error message if you pass wrong arguments or not enough arguments:

$ python vcs.py checkout
usage:  checkout url
 checkout: error: too few arguments

plac can also be used to write command interpreters.


From roy at panix.com  Wed Sep 28 08:53:06 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 08:53:06 -0400
Subject: oauth2 server implementation
References: <4c93ff75-1d85-48ec-b6d1-b71f216c61ce@g33g2000yqc.googlegroups.com>
	<roy-E5FDBE.20170027092011@news.panix.com>
	<862e37e9-f4d2-4423-8d28-485923f1c76b@p11g2000yqe.googlegroups.com>
Message-ID: <roy-6F8862.08530628092011@news.panix.com>

In article 
<862e37e9-f4d2-4423-8d28-485923f1c76b at p11g2000yqe.googlegroups.com>,
 Aljosa Mohorovic <aljosa.mohorovic at gmail.com> wrote:

> On Sep 28, 2:17?am, Roy Smith <r... at panix.com> wrote:
> > We rolled our own oauth2 client on top of basic urllib calls. ?It's not
> > terribly difficult.
> 
> i'm asking about oauth2 server implementation, not client.
> it's easy to consume oauth2 stuff but what to do when you need to
> implement server side stuff?

Oh, my apologies, I read your post too fast and misunderstood what you 
were asking.  I suspect writing an oauth2 provider will be on my plate 
soon, so let me know what you figure out :-)


From xahlee at gmail.com  Wed Sep 28 09:14:33 2011
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 28 Sep 2011 06:14:33 -0700 (PDT)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
Message-ID: <2b90e8b7-2f1e-4f24-9413-56a3fafa897b@z12g2000yqz.googlegroups.com>

here's more detail about the origin of this problem. Relevant to emacs
lisp only.

------------------------------

in the definition of ?replace-regexp-in-string?, there's this comment:

  ;; To avoid excessive consing from multiple matches in long strings,
  ;; don't just call `replace-match' continually.  Walk down the
  ;; string looking for matches of REGEXP and building up a (reversed)
  ;; list MATCHES.  This comprises segments of STRING which weren't
  ;; matched interspersed with replacements for segments that were.
  ;; [For a `large' number of replacements it's more efficient to
  ;; operate in a temporary buffer; we can't tell from the function's
  ;; args whether to choose the buffer-based implementation, though it
  ;; might be reasonable to do so for long enough STRING.]

note: ?For a `large' number of replacements it's more efficient to
operate in a temporary buffer?.

my question is, anyone got some idea, how ?large? is large?

currently, i have a function replace-pairs-in-string which is
implemented by repeatedly calling ?replace-pairs-in-string? like this:

(while (< ii (length pairs))
      (setq mystr (replace-regexp-in-string
                   (elt tempMapPoints ii)
                   (elt (elt pairs ii) 1)
                   mystr t t))
      (setq ii (1+ ii))
      )

When there are 260 pairs of strings to be replaced on a file that's
26k in size, my function takes about 3 seconds (which i think is too
slow). I'm at pain deciding whether my function should be implemented
like this or whether it should create a temp buffer. The problem with
temp buffer is that, if you repeatedly call it, the overhead of
creating buffer is going to make it much slower.

i was actually surprised that replace-regexp-in-string isn't written
in C, which i thought it was.

is there technical reason the replace-regexp-in-string isn't C? (i
suppose only because nobody every did it and the need for speed didn't
suffice?) and also, shouldn't there also be a replace-in-string
(literal, not regex)? because i thought implementing replacement for
string should be much simpler and faster, because buffers comes with
it a whole structure such as ?point?, text properties, buffer names,
buffier modifier, etc.

 Xah

On Sep 28, 5:28?am, Xah Lee <xah... at gmail.com> wrote:
> On Sep 28, 3:57?am, mer... at stonehenge.com (Randal L. Schwartz) wrote:
>
> > >>>>> "Xah" == Xah Lee <xah... at gmail.com> writes:
>
> > Xah> curious question.
> > Xah> suppose you have 300 different strings and they need all be replaced
> > Xah> to say "aaa".
>
> > And then suppose this isn't the *real* question, but one entirely of
> > Fiction by Xah Lee.
>
> > How helpful do you want to be?
>
> it's a interesting question anyway.
>
> the question originally came from when i was coding elisp of a
> function that changes html entities to unicode char literal. The
> problem is slightly complicated, involving a few questions about speed
> in emacs. e.g. string vs buffer, and much more... i spent several
> hours on this but it's probably too boring to detail (but i'll do so
> if anyone wishes). But anyway, while digging these questions that's
> not clear in my mind, i thought of why not generate a regex or
> construct and do it in one shot, and wondered if that'd be faster. But
> afterwards, i realized this wouldn't be applicable to my problem
> because for my problem each string needs to be changed to a unique
> string, not all to the same string.
>
> ?Xah



From rosuav at gmail.com  Wed Sep 28 09:19:32 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 23:19:32 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
Message-ID: <CAPTjJmoX60sP4kRFvts8HjuDNMwqxUBmcy3MoH2DTazwVwF33g@mail.gmail.com>

On Wed, Sep 28, 2011 at 10:28 PM, Xah Lee <xahlee at gmail.com> wrote:
> each string needs to be changed to a unique
> string, not all to the same string.

And you'll find that this is, by and large, the most normal situation.
Folding many strings down to one string is a lot less common. So,
let's have some real-world use cases and then we can talk
recommendations.

ChrisA


From neilc at norwich.edu  Wed Sep 28 09:22:41 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 28 Sep 2011 13:22:41 GMT
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<mailman.1524.1317215975.27778.python-list@python.org>
Message-ID: <9egld1F385U1@mid.individual.net>

On 2011-09-28, Chris Angelico <rosuav at gmail.com> wrote:
> On Wed, Sep 28, 2011 at 10:28 PM, Xah Lee <xahlee at gmail.com> wrote:
>> each string needs to be changed to a unique string, not all to
>> the same string.
>
> And you'll find that this is, by and large, the most normal
> situation. Folding many strings down to one string is a lot
> less common. So, let's have some real-world use cases and then
> we can talk recommendations.

I'd like to know what "string replacement" is supposed to mean in
the context of Python.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From rosuav at gmail.com  Wed Sep 28 09:26:37 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 23:26:37 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <2b90e8b7-2f1e-4f24-9413-56a3fafa897b@z12g2000yqz.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<2b90e8b7-2f1e-4f24-9413-56a3fafa897b@z12g2000yqz.googlegroups.com>
Message-ID: <CAPTjJmpv4vRy1YKGM2cqSRK_-hAVMfFuXdi6c=iwC+gzh3RquA@mail.gmail.com>

On Wed, Sep 28, 2011 at 11:14 PM, Xah Lee <xahlee at gmail.com> wrote:
> (while (< ii (length pairs))
> ? ? ?(setq mystr (replace-regexp-in-string
> ? ? ? ? ? ? ? ? ? (elt tempMapPoints ii)
> ? ? ? ? ? ? ? ? ? (elt (elt pairs ii) 1)
> ? ? ? ? ? ? ? ? ? mystr t t))
> ? ? ?(setq ii (1+ ii))
> ? ? ?)

from __future__ import lisp_syntax

There, that makes it on-topic for the Python list... I guess.

ChrisA


From __peter__ at web.de  Wed Sep 28 09:29:19 2011
From: __peter__ at web.de (Peter Otten)
Date: Wed, 28 Sep 2011 15:29:19 +0200
Subject: how to run in xp?
References: <tencent_3C36EA947F825BD94E8366FD@qq.com>
Message-ID: <j5v7en$t29$1@dough.gmane.org>

=?gbk?B?ytjW6rT9zcM=?= wrote:

> it can run ,but there is still a problem ,nothing in my file.
> please run the code in xp+python32
> import urllib.request, urllib.parse, urllib.error
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     print (file)
> what you get is:
> 
>>>> 
> b''
> b''
> b''
>>>> 
> 
> how to fix it?

I get the expected output, but I'm on Linux. Are you using the latest bugfix 
release (Python 3.2.2)? Can you download the data with your browser?



From roy at panix.com  Wed Sep 28 09:29:57 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 09:29:57 -0400
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<mailman.1524.1317215975.27778.python-list@python.org>
	<9egld1F385U1@mid.individual.net>
Message-ID: <roy-2F5DEE.09295728092011@news.panix.com>

In article <9egld1F385U1 at mid.individual.net>,
 Neil Cerutti <neilc at norwich.edu> wrote:

> On 2011-09-28, Chris Angelico <rosuav at gmail.com> wrote:
> > On Wed, Sep 28, 2011 at 10:28 PM, Xah Lee <xahlee at gmail.com> wrote:
> >> each string needs to be changed to a unique string, not all to
> >> the same string.
> >
> > And you'll find that this is, by and large, the most normal
> > situation. Folding many strings down to one string is a lot
> > less common. So, let's have some real-world use cases and then
> > we can talk recommendations.
> 
> I'd like to know what "string replacement" is supposed to mean in
> the context of Python.

You just need to use "string" in the more generic computer-sciency 
sense, not in the python-data-type sense.

s = "I am an immutable string"
l = list(s)      # now you can pretend strings are mutable
do_stuff_to_string(l)
s = ''.join(l)


From rosuav at gmail.com  Wed Sep 28 09:32:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Wed, 28 Sep 2011 23:32:49 +1000
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <9egld1F385U1@mid.individual.net>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<mailman.1524.1317215975.27778.python-list@python.org>
	<9egld1F385U1@mid.individual.net>
Message-ID: <CAPTjJmoO-7uVbYZGOVDKL0V49pBMA6isdYxz3-LJtr=9-4VPbg@mail.gmail.com>

On Wed, Sep 28, 2011 at 11:22 PM, Neil Cerutti <neilc at norwich.edu> wrote:
> I'd like to know what "string replacement" is supposed to mean in
> the context of Python.
>

Substring replacement, such as:
>>> "Hello, world!".replace(", "," -- ")
'Hello -- world!'

The str method doesn't accept a list, though, so it won't do
simultaneous replaces. (At least, I don't think it can. Tried it only
in Python 3.2 on Windows.)

ChrisA


From python.list at tim.thechases.com  Wed Sep 28 10:16:59 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 28 Sep 2011 09:16:59 -0500
Subject: Unittest testing assert*() calls rather than methods?
Message-ID: <4E832C5B.1080007@tim.thechases.com>

While I asked this on the Django list as it happened to be with 
some Django testing code, this might be a more generic Python 
question so I'll ask here too.

When performing unittest tests, I have a number of methods of the 
form

   def test_foo(self):
     data = (
       (item1, result1),
       ... #bunch of tests for fence-post errors
       )
     for test, result in data:
       self.assertEqual(process(test), result)

When I run my tests, I only get a tick for running one the one 
test (test_foo), not the len(data) tests that were actually 
performed.  Is there a way for unittesting to report the number 
of passed-assertions rather than the number of test-methods run?

-tkc




From ben+python at benfinney.id.au  Wed Sep 28 10:17:57 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 00:17:57 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <87oby4zr6y.fsf@benfinney.id.au>

DevPlayer <devplayer at gmail.com> writes:

> Calling the Bible a joke is used to hurt people, not enlighten them.

How do you know that?

> Those words show bitter arrogance, not constructive critism

How do you know that?

> as it ignores how others feel about that book.

That strikes me as a good thing; how people feel about a book should not
in any way restrain our criticism of the book.

> What benefit to others is gained by calling someones belief a joke? To
> put the "believers" minds straight? I think not.

I can't speak for the person who wrote that. But when I call a religious
belief a joke, it is to point out the folly of the belief in the pursuit
of convincing people not to hold beliefs I consider to be foolish.

> I think the unsensitive person who attackes others beliefs, even if
> illogical or unrealistic, is after some kind of self grandizement or
> to illude themself into thinking "they know the truth of the universe"
> and should attack others to prove they do.

You are wrong to conflate ?attack others's beliefs? with ?attack
others?.

You are not your beliefs. If your beliefs are shown to be false ? even
ridiculous ? you can distance yourself from those beliefs. It is even
virtuous to do so.

We must always be free to attack any belief, and encourage everyone to
stop taking it as any kind of personal attack.

> Although this is not the place to defend about such things it is also
> not the place to attack those same things (that being someone's
> faith).

I will join you in deploring any attack on a person. But that's not what
you're doing, and I deny your attempt to shield any idea from ridicule,
in any forum.

Ideas don't have feelings, and you don't get to put people in front of
them as human shields against attacking those ideas.

Any idea is and must be open to attack in any forum; those that can't
survive ridicule deserve to go.

-- 
 \              ?Ridicule is the only weapon which can be used against |
  `\       unintelligible propositions.? ?Thomas Jefferson, 1816-07-30 |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Wed Sep 28 10:29:18 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 00:29:18 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
Message-ID: <87k48szqo1.fsf@benfinney.id.au>

Tim Chase <python.list at tim.thechases.com> writes:

>   def test_foo(self):
>     data = (
>       (item1, result1),
>       ... #bunch of tests for fence-post errors
>       )
>     for test, result in data:
>       self.assertEqual(process(test), result)

The sets of data for running the same test we might call ?scenarios?.

> When I run my tests, I only get a tick for running one the one test
> (test_foo), not the len(data) tests that were actually performed.

Worse, if one of the scenarios causes the test to fail, the loop will
end and you won't get the results for the remaining scenarios.

> Is there a way for unittesting to report the number of
> passed-assertions rather than the number of test-methods run?

You can use the third-party ?testscenarios? library
<URL:http://pypi.python.org/pypi/test-scenarios> to generate test cases
at run time, one for each combination of scenarios with test cases on
the class. They will all be run and reported as distinct test cases.

There is even another library integrating this with Django
<URL:http://pypi.python.org/pypi/django-testscenarios>.

-- 
 \     ?Books and opinions, no matter from whom they came, if they are |
  `\     in opposition to human rights, are nothing but dead letters.? |
_o__)                                                  ?Ernestine Rose |
Ben Finney


From ben+python at benfinney.id.au  Wed Sep 28 10:53:40 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 00:53:40 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
Message-ID: <87fwjgzpjf.fsf@benfinney.id.au>

Ben Finney <ben+python at benfinney.id.au> writes:

> You can use the third-party ?testscenarios? library

The URL got a bit mangled. The proper PyPI URL for that library is
<URL:http://pypi.python.org/pypi/testscenarios>.

> to generate test cases at run time, one for each combination of
> scenarios with test cases on the class. They will all be run and
> reported as distinct test cases.
>
> There is even another library integrating this with Django
> <URL:http://pypi.python.org/pypi/django-testscenarios>.

-- 
 \        ?Don't worry about people stealing your ideas. If your ideas |
  `\     are any good, you'll have to ram them down people's throats.? |
_o__)                                                    ?Howard Aiken |
Ben Finney


From drobinow at gmail.com  Wed Sep 28 12:17:05 2011
From: drobinow at gmail.com (David Robinow)
Date: Wed, 28 Sep 2011 12:17:05 -0400
Subject: how to run in xp?
In-Reply-To: <j5v7en$t29$1@dough.gmane.org>
References: <tencent_3C36EA947F825BD94E8366FD@qq.com>
	<j5v7en$t29$1@dough.gmane.org>
Message-ID: <CAF3XjbyEP-Nv7qhGo18=SW-9tsJG5PMYP6DCNO9EiJVU26RBVA@mail.gmail.com>

On Wed, Sep 28, 2011 at 9:29 AM, Peter Otten <__peter__ at web.de> wrote:
> =?gbk?B?ytjW6rT9zcM=?= wrote:
>
>> it can run ,but there is still a problem ,nothing in my file.
>> please run the code in xp+python32
>> import urllib.request, urllib.parse, urllib.error
>> exchange=['NASDAQ','NYSE','AMEX']
>> for down in exchange:
>> ? ? url='http://www.nasdaq.com/screening/companies-by-
> industry.aspx?exchange='+down+'&render=download'
>> ? ? file=urllib.request.urlopen(url).read()
>> ? ? print (file)
>> what you get is:
>>
>>>>>
>> b''
>> b''
>> b''
>>>>>
>>
>> how to fix it?
>
> I get the expected output, but I'm on Linux. Are you using the latest bugfix
> release (Python 3.2.2)? Can you download the data with your browser?
I get the expected output, but I'm on Windows (Vista, Python 3.2.2.)


From alec.taylor6 at gmail.com  Wed Sep 28 12:19:32 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Thu, 29 Sep 2011 02:19:32 +1000
Subject: Python 2.5 zlib trouble
In-Reply-To: <CAMuTYXiE6HDP3UATaDd60f9ysgMR1SU-HYDp0Lo2NSvgxe=g+w@mail.gmail.com>
References: <9ad79d78-e283-40bd-b234-1cdc6558a9ab@v18g2000yqj.googlegroups.com>
	<4e7c3f18$0$29986$c3e8da3$5496439d@news.astraweb.com>
	<308367fd-15e4-4133-9fbe-6a919103ce3f@hb5g2000vbb.googlegroups.com>
	<mailman.1405.1316812862.27778.python-list@python.org>
	<78c0c680-1abc-424d-a608-f14ce81ed7e8@t11g2000yqa.googlegroups.com>
	<mailman.1427.1316876233.27778.python-list@python.org>
	<2ebd0289-5c38-499f-a984-b1e2b669c4c3@gd10g2000vbb.googlegroups.com>
	<CAMuTYXhaP20hZLRUbsjeMQp9Zrq53YqD1=y1Bty09fvK7+jzRg@mail.gmail.com>
	<mailman.1448.1316911903.27778.python-list@python.org>
	<16b3f911-b0bd-4893-a338-5caae441daf8@18g2000yqz.googlegroups.com>
	<CAMuTYXiE6HDP3UATaDd60f9ysgMR1SU-HYDp0Lo2NSvgxe=g+w@mail.gmail.com>
Message-ID: <CAO+9iGdwWJmacW4RvfQsHAe5OroNRdgRAb+9MCM=8OH7Fg_E3w@mail.gmail.com>

Fix: http://lipyrary.blogspot.com/2011/05/how-to-compile-python-on-ubuntu-1104.html

On Tue, Sep 27, 2011 at 5:04 AM, Benjamin Kaplan
<benjamin.kaplan at case.edu> wrote:
> On Mon, Sep 26, 2011 at 2:16 PM, Jesramz <jesus.ramirez.utexas at gmail.com> wrote:
>>
>> I appreciate all the help, but I am still a little confused. Sorry,
>> I'm a lay person.
>>
>> Should I download zlib1g-dev and install it to get the zlib module?
>>
>> and Alter the configure script to avoid future issues?
>>
>> Also about getting zlib I found the following:
>>
>> "I was able to recompile zlib
>>
>> $./configure --shared
>>
>> then recompile Python 2.5.1; I am now able to import the zlib module.
>>
>> cheers
>>
>> -sg"
>>
>> Does this mean that while in the zlib folder run ./configure shared
>> and then install python?
>> --
>
> Not quite. This person was talking about configuring zlib, not Python.
> Just about every Linux program out there has a ./configure file- it's
> part of GNU Autotools, which many programs use as an easy way to
> compile and install their software. Since the version of zlib on
> Ubuntu Natty doesn't work for Python 2.5, this person just compiled
> their own zlib (calling ./configure --shared; make; make install from
> the zlib *source* folder that they downloaded) and then compiled their
> own Python version (from the Python source folder that they
> downloaded)
>
>
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From willem at toad.stack.nl  Wed Sep 28 13:00:51 2011
From: willem at toad.stack.nl (Willem)
Date: Wed, 28 Sep 2011 17:00:51 +0000 (UTC)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
Message-ID: <slrnj86km3.1egn.willem@toad.stack.nl>

Xah Lee wrote:
) the question originally came from when i was coding elisp of a
) function that changes html entities to unicode char literal. The
) problem is slightly complicated, involving a few questions about speed
) in emacs. e.g. string vs buffer, and much more... i spent several
) hours on this but it's probably too boring to detail (but i'll do so
) if anyone wishes). But anyway, while digging these questions that's
) not clear in my mind, i thought of why not generate a regex or
) construct and do it in one shot, and wondered if that'd be faster. But
) afterwards, i realized this wouldn't be applicable to my problem
) because for my problem each string needs to be changed to a unique
) string, not all to the same string.

In Perl, it would be applicable.  You see, in Perl, you can call a function
in the replacement of the regex substitution, which can then look up the
html entity and return the wanted unicode literal.

I think you can do that in some other languages as well.


SaSW, Willem
-- 
Disclaimer: I am in no way responsible for any of the statements
            made in the above text. For all I know I might be
            drugged or something..
            No I'm not paranoid. You all think I'm paranoid, don't you !
#EOT


From python at mrabarnett.plus.com  Wed Sep 28 13:11:33 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 28 Sep 2011 18:11:33 +0100
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <slrnj86km3.1egn.willem@toad.stack.nl>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
Message-ID: <4E835545.9010802@mrabarnett.plus.com>

On 28/09/2011 18:00, Willem wrote:
> Xah Lee wrote:
> ) the question originally came from when i was coding elisp of a
> ) function that changes html entities to unicode char literal. The
> ) problem is slightly complicated, involving a few questions about speed
> ) in emacs. e.g. string vs buffer, and much more... i spent several
> ) hours on this but it's probably too boring to detail (but i'll do so
> ) if anyone wishes). But anyway, while digging these questions that's
> ) not clear in my mind, i thought of why not generate a regex or
> ) construct and do it in one shot, and wondered if that'd be faster. But
> ) afterwards, i realized this wouldn't be applicable to my problem
> ) because for my problem each string needs to be changed to a unique
> ) string, not all to the same string.
>
> In Perl, it would be applicable.  You see, in Perl, you can call a function
> in the replacement of the regex substitution, which can then look up the
> html entity and return the wanted unicode literal.
>
> I think you can do that in some other languages as well.
>
Including Python...


From ian.g.kelly at gmail.com  Wed Sep 28 13:48:48 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Wed, 28 Sep 2011 11:48:48 -0600
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <CALwzidnfaDbR1DGj+TdN_S=rJKS1ZegpkXBWtmLriLdBw-4KPA@mail.gmail.com>

On Wed, Sep 28, 2011 at 3:28 AM, Xah Lee <xahlee at gmail.com> wrote:
> curious question.
>
> suppose you have 300 different strings and they need all be replaced
> to say "aaa".
>
> is it faster to replace each one sequentially (i.e. replace first
> string to aaa, then do the 2nd, 3rd,...)
> , or is it faster to use a regex with ?or? them all and do replace one
> shot? (i.e. "1ststr|2ndstr|3rdstr|..." -> aaa)
>
> let's say the sourceString this replacement to be done on is 500k
> chars.
>
> Anyone? i suppose the answer will be similar for perl, python, ruby.
>
> btw, the origin of this question is about writing a emacs lisp
> function that replace ~250 html named entities to unicode char.

I haven't timed it at the scale you're talking about, but for Python I
expect regex will be your best bet:

# Python 3.2: Supposing the match strings and replacements are
# in a dict stored as `repls`...

import re

pattern = '|'.join(map(re.escape, repls.keys()))
new_str = re.sub(pattern, lambda m: repls[m.group()], old_str)

The problem with doing 300 str.replace calls is the 300 intermediate
strings that would be created and then collected.

Cheers,
Ian


From * at eli.users.panix.com  Wed Sep 28 15:08:21 2011
From: * at eli.users.panix.com (Eli the Bearded)
Date: Wed, 28 Sep 2011 19:08:21 +0000 (UTC)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
Message-ID: <eli$1109281505@qz.little-neck.ny.us>

In comp.lang.perl.misc, Willem  <willem at toad.stack.nl> wrote:
> In Perl, it would be applicable.  You see, in Perl, you can call a function
> in the replacement of the regex substitution, which can then look up the
> html entity and return the wanted unicode literal.

A function? I'd use a hash.

> I think you can do that in some other languages as well.

Hash / array type substitutions indexed by $1 (or language equivilent)
are probably easy to implement in many languages.

Elijah
------
for really fast, write code to generate a C lexer to do it


From willem at toad.stack.nl  Wed Sep 28 15:11:27 2011
From: willem at toad.stack.nl (Willem)
Date: Wed, 28 Sep 2011 19:11:27 +0000 (UTC)
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
	<eli$1109281505@qz.little-neck.ny.us>
Message-ID: <slrnj86sav.276n.willem@toad.stack.nl>

Eli the Bearded wrote:
) In comp.lang.perl.misc, Willem  <willem at toad.stack.nl> wrote:
)> In Perl, it would be applicable.  You see, in Perl, you can call a function
)> in the replacement of the regex substitution, which can then look up the
)> html entity and return the wanted unicode literal.
)
) A function? I'd use a hash.

A function can return a sensible value for unknown substitutions.
In the case where you prebuild a giant regex or-list, that is not an issue,
but I would match html entities generically.


SaSW, Willem
-- 
Disclaimer: I am in no way responsible for any of the statements
            made in the above text. For all I know I might be
            drugged or something..
            No I'm not paranoid. You all think I'm paranoid, don't you !
#EOT


From john at castleamber.com  Wed Sep 28 16:14:51 2011
From: john at castleamber.com (John Bokma)
Date: Wed, 28 Sep 2011 15:14:51 -0500
Subject: question about speed of sequential string replacement vs regex or
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
	<86bou553yv.fsf@red.stonehenge.com>
	<4f37d1f2-699a-4646-a243-cbb3558989c2@j1g2000yqj.googlegroups.com>
	<slrnj86km3.1egn.willem@toad.stack.nl>
	<eli$1109281505@qz.little-neck.ny.us>
	<slrnj86sav.276n.willem@toad.stack.nl>
Message-ID: <8739fgjuf8.fsf@castleamber.com>

Willem <willem at toad.stack.nl> writes:

> Eli the Bearded wrote:
> ) In comp.lang.perl.misc, Willem  <willem at toad.stack.nl> wrote:
> )> In Perl, it would be applicable.  You see, in Perl, you can call a function
> )> in the replacement of the regex substitution, which can then look up the
> )> html entity and return the wanted unicode literal.
> )
> ) A function? I'd use a hash.
>
> A function can return a sensible value for unknown substitutions.

You can do that also in the RHS of the substitution and still keep it
readable if you use something like

s{..}{

    your
    code
    goes
    here
}ge;

However, a function can be easier on the eye:

s{...}{ some_good_name( ... ) }ge;

-- 
John Bokma                                                               j3b

Blog: http://johnbokma.com/        Perl Consultancy: http://castleamber.com/
Perl for books:    http://johnbokma.com/perl/help-in-exchange-for-books.html


From theg33k at gmail.com  Wed Sep 28 17:06:23 2011
From: theg33k at gmail.com (The Geek)
Date: Wed, 28 Sep 2011 17:06:23 -0400
Subject: new to python question
Message-ID: <CAGE_Tf1GUagGGrWCAJV2kek3KHhHhULjxPcSfB3BiWi1LogO8A@mail.gmail.com>

I'm clearly not understanding something about scope in python...  Any help
is appreciated

In the following script I'm attempting to create 2 Foo objects, for each Foo
object I create 2 Bars and add them to Foo's bar array

Something hokey is occurring with the "foo.bars.append(bar)" line such that
Foo.bars is treated as a "static" (I know python doesn't have statics)

I have a workaround using encapsulation for the bars array but I prefer
would also like to understand the issue.

TIA,
Brad

[SCRIPT]
foos = []

class Foo:
id = 0
bars = []

class Bar:
id = 0

for j in range(0, 2):
foo = Foo()

for i in range(0, 2):
bar = Bar()
bar.id = i
foo.bars.append(bar)
foos.append(foo)

for myFoo in foos:
print("foo id: ", myFoo.id)
for myBar in myFoo.bars:
print ("\tbar id: ", myBar.id)

[/SCRIPT]

[OUTPUT]
python test.py
foo id:  0
        bar id:  0
        bar id:  1
        bar id:  0
        bar id:  1
foo id:  0
        bar id:  0
        bar id:  1
        bar id:  0
        bar id:  1
[/OUTPUT]
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From benjamin.kaplan at case.edu  Wed Sep 28 17:12:13 2011
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 28 Sep 2011 17:12:13 -0400
Subject: new to python question
In-Reply-To: <CAGE_Tf1GUagGGrWCAJV2kek3KHhHhULjxPcSfB3BiWi1LogO8A@mail.gmail.com>
References: <CAGE_Tf1GUagGGrWCAJV2kek3KHhHhULjxPcSfB3BiWi1LogO8A@mail.gmail.com>
Message-ID: <CAMuTYXhAMJyKp=j1MxqR1gN8LBYpHnGCaXgfLU9JUS1DpH=TYA@mail.gmail.com>

On Wed, Sep 28, 2011 at 5:06 PM, The Geek <theg33k at gmail.com> wrote:
> I'm clearly not understanding something about scope in python... ?Any help
> is appreciated
> In the following script I'm attempting to create 2 Foo objects, for each Foo
> object I create 2 Bars and add them to Foo's bar array
> Something hokey is?occurring?with the "foo.bars.append(bar)" line such that
> Foo.bars is treated as a "static" (I know python doesn't have statics)
> I have a workaround using encapsulation for the bars array but I prefer
> would also like to understand the issue.
> TIA,
> Brad
> [SCRIPT]
> foos = []
> class Foo:
> id = 0
> bars = []
> class Bar:
> id = 0
> for j in range(0, 2):
> foo = Foo()
> for i in range(0, 2):
> bar = Bar()
> bar.id = i
> foo.bars.append(bar)
> foos.append(foo)
> for myFoo in foos:
> print("foo id: ", myFoo.id)
> for myBar in myFoo.bars:
> print ("\tbar id: ", myBar.id)
> [/SCRIPT]


It's a pretty common gotcha for people coming from other languages.
Everything declared in the class scope becomes an attribute of the
class.
>>> class Foo(object) :
...    a = 3
...    def b() : pass
...
>>> dir(Foo)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribut
e__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_e
x__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '_
_weakref__', 'a', 'b']

Mutating those objects mutates the attribute of the class, which is
visible to all instances of the class.

In order to get an instance of a class, you have to add the field to
the instance of the class instead of to the class itself.

class Bar(object) :
    def ___init__(self) :
        self.a = 3


From tjreedy at udel.edu  Wed Sep 28 17:23:50 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 28 Sep 2011 17:23:50 -0400
Subject: question about speed of sequential string replacement vs regex or
In-Reply-To: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
References: <0062679d-6cde-4e61-baff-3a7289ac5090@t11g2000yqa.googlegroups.com>
Message-ID: <j6039d$co9$1@dough.gmane.org>

On 9/28/2011 5:28 AM, Xah Lee wrote:
> curious question.
>
> suppose you have 300 different strings and they need all be replaced
> to say "aaa".
>
> is it faster to replace each one sequentially (i.e. replace first
> string to aaa, then do the 2nd, 3rd,...)
> , or is it faster to use a regex with ?or? them all and do replace one
> shot? (i.e. "1ststr|2ndstr|3rdstr|..." ->  aaa)

Here the problem is replace multiple random substrings with one random 
substring that could create new matches. I would start with the re 'or' 
solution.

> btw, the origin of this question is about writing a emacs lisp
> function that replace ~250 html named entities to unicode char.

As you noted this is a different problem in that there is a different 
replacement for each. Also, the substrings being searched for are not 
random but have a distinct and easily recognized structure. The 
replacement cannot create a new match. So the multiple scan approach 
*could* work.

Unspecified is whether the input is unicode or ascii bytes. If the 
latter I might copy to a bytearray (mutable), scan forward, replace 
entity defs with utf-8 encoding of the corresponding unicode (with a 
dict lookup, and which I assume are *always* fewer chars), and shift 
other chars to close any gaps created.

If the input is unicode, I might do the same with array.array (which is 
where bytearray came from). Or I might use the standard idiom of 
constructing a list of pieces of the original, with replacements, and 
''.join() at the end.

-- 
Terry Jan Reedy




From ethan at stoneleaf.us  Wed Sep 28 17:26:09 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Wed, 28 Sep 2011 14:26:09 -0700
Subject: syntactic sugar for def?
Message-ID: <4E8390F1.9060207@stoneleaf.us>

I remember that 'class' is sugar for type(....).

I don't remember if 'def' is sugar for something besides lambda.

Any clues for me?  Heck, I'll even be grateful for outright answers!

~Ethan~


From ian.g.kelly at gmail.com  Wed Sep 28 17:36:08 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Wed, 28 Sep 2011 15:36:08 -0600
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <CALwzidk=PRFf2bxEywYC=iJ1N+hERMhqQYovZNgJBjq8gXbEKA@mail.gmail.com>

On Wed, Sep 28, 2011 at 3:26 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> I remember that 'class' is sugar for type(....).
>
> I don't remember if 'def' is sugar for something besides lambda.
>
> Any clues for me? ?Heck, I'll even be grateful for outright answers!

If you mean is there a way to create functions using reflection, you
can use types.FunctionType.  Like type() requires a dict,
FunctionType() requires a code object that must first be compiled.

Cheers,
Ian


From arnodel at gmail.com  Wed Sep 28 17:37:12 2011
From: arnodel at gmail.com (Arnaud Delobelle)
Date: Wed, 28 Sep 2011 22:37:12 +0100
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>

On 28 September 2011 22:26, Ethan Furman <ethan at stoneleaf.us> wrote:
> I remember that 'class' is sugar for type(....).
>
> I don't remember if 'def' is sugar for something besides lambda.
>
> Any clues for me? ?Heck, I'll even be grateful for outright answers!

It's not really sugar.  But I think you mean something like this:


>>> class A: pass
...
>>> type(A)
<class 'type'>
>>> type is type(A)
True

So the closest you get for functions will be:

>>> def f(): pass
...
>>> type(f)
<class 'function'>

Try help(type(f)) to see how to use it to create a function object.
The problem is that you need to provide a code object, and the easiest
way to create a code object is to use a def statement :)

HTH

-- 
Arnaud


From tayfun92_kayhan at yahoo.com  Wed Sep 28 17:49:21 2011
From: tayfun92_kayhan at yahoo.com (Tayfun Kayhan)
Date: Wed, 28 Sep 2011 14:49:21 -0700 (PDT)
Subject: A trivial question
Message-ID: <1317246561.85326.YahooMailNeo@web120310.mail.ne1.yahoo.com>

I accidentally wrote such a code (below) while trying to write sth else for my application but i am now just wondering much how to run the class Foo, if it is possible. Is not it weird that Python does not give any error when I run it ? Sorry for that it's pretty unimportant question according to the other questions being asked here :D

def trial():
class Foo(object):
def __init__(self):
print("Hello, world!")
trial() # not worked, as expected.
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From ckaynor at zindagigames.com  Wed Sep 28 17:51:00 2011
From: ckaynor at zindagigames.com (Chris Kaynor)
Date: Wed, 28 Sep 2011 14:51:00 -0700
Subject: syntactic sugar for def?
In-Reply-To: <CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>
References: <4E8390F1.9060207@stoneleaf.us>
	<CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>
Message-ID: <CALvWhxvi3vb5uXpEUqeLkhYa2322wPi+DKRC=Goa-oTnftV8cw@mail.gmail.com>

On Wed, Sep 28, 2011 at 2:37 PM, Arnaud Delobelle <arnodel at gmail.com> wrote:
> On 28 September 2011 22:26, Ethan Furman <ethan at stoneleaf.us> wrote:
>> I remember that 'class' is sugar for type(....).
>>
>> I don't remember if 'def' is sugar for something besides lambda.
>>
>> Any clues for me? ?Heck, I'll even be grateful for outright answers!
>
> It's not really sugar. ?But I think you mean something like this:
>
>
>>>> class A: pass
> ...
>>>> type(A)
> <class 'type'>
>>>> type is type(A)
> True
>
> So the closest you get for functions will be:
>
>>>> def f(): pass
> ...
>>>> type(f)
> <class 'function'>
>
> Try help(type(f)) to see how to use it to create a function object.
> The problem is that you need to provide a code object, and the easiest
> way to create a code object is to use a def statement :)

I would say compile isn't too much harder to use:
>>> c = compile('a = 123', 'test', 'exec')
>>> d = {}
>>> f = types.FunctionType(c, d, 'test')
>>> f()
>>> print d
{'a': 123}

Although it appears you get all of the variables defined as global
apparently (try "f = types.FunctionType(c, globals(), 'test')"
instead).

>
> HTH
>
> --
> Arnaud
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tayfun92_kayhan at yahoo.com  Wed Sep 28 17:53:59 2011
From: tayfun92_kayhan at yahoo.com (Tayfun Kayhan)
Date: Wed, 28 Sep 2011 14:53:59 -0700 (PDT)
Subject: A Trivial Question
Message-ID: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>

I accidentally wrote such a code (below) while trying to write sth else for my application but i am now just wondering much how to run the class Foo, if it is possible. Is not it weird that Python does not give any error when I run it ? Sorry for that it's pretty unimportant question according to the other questions being asked here :D

def trial():
class Foo(object):
def __init__(self):
print("Hello, world!")
trial() # not worked, as expected.
-------------- next part --------------
An HTML attachment was scrubbed...
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From tjreedy at udel.edu  Wed Sep 28 18:03:48 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 28 Sep 2011 18:03:48 -0400
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <4E832C5B.1080007@tim.thechases.com>
References: <4E832C5B.1080007@tim.thechases.com>
Message-ID: <j605ka$sps$1@dough.gmane.org>

On 9/28/2011 10:16 AM, Tim Chase wrote:

> When performing unittest tests, I have a number of methods of the form
>
> def test_foo(self):
> data = (
> (item1, result1),
> ... #bunch of tests for fence-post errors
> )
> for test, result in data:
> self.assertEqual(process(test), result)
>
> When I run my tests, I only get a tick for running one the one test
> (test_foo), not the len(data) tests that were actually performed. Is
> there a way for unittesting to report the number of passed-assertions
> rather than the number of test-methods run?

In my view, unittest, based on JUnit from Java, is both overkill and 
inadequate for simple function testing of multiple input-output pairs. 
So I wrote my own short function test function that does just what I 
want, and which I can change if I change what I want.

Ben has described the combinatorial explosion solution. But if I were 
using unittest, I might do something like the following:

   def test_foo(self):
     data = (
       (item1, result1),
       ... #bunch of tests for fence-post errors
       )
     errors = []
     for input, expected in data:
       try:
         actual = process(input)
         if actual != expected: errors.append(input, expected, actual)
       except Exception as e:
         errors.append(input, expected, actual)
     self.assertEqual((0,[]), (len(errors),errors))

except that I would write a functest(func, iopairs) that returned the 
error pair. (This is essentially what I have done for for myself.)  I am 
presuming that one can run unittest so that it prints the unequal items.

-- 
Terry Jan Reedy



From clp2 at rebertia.com  Wed Sep 28 18:06:14 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 28 Sep 2011 15:06:14 -0700
Subject: A Trivial Question
In-Reply-To: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
References: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
Message-ID: <CAMZYqRTMYJEbfeGTLgUiN2u5PO0BCuOUVasbP2R18c=bw+kyMg@mail.gmail.com>

On Wed, Sep 28, 2011 at 2:53 PM, Tayfun Kayhan
<tayfun92_kayhan at yahoo.com> wrote:
> I accidentally wrote such a code (below) while trying to write sth else for
> my application but i am now just wondering much how to run the class Foo, if
> it is possible. Is not it weird that Python does not give any error when I
> run it ? Sorry for that it's pretty unimportant question according to the
> other questions being asked here :D
> def trial():
>     class Foo(object):
>         def __init__(self):
>             print("Hello, world!")
> trial() # not worked, as expected.

Right now, you've merely defined a class in the local scope of a
function, which is perfectly valid, although you don't take advantage
of this, so there's no particular reason to put the class definition
inside trial(). Foo.__init__() only gets called when you create an
instance of Foo, which you aren't doing currently, hence why "Hello,
world!" isn't printed.

Try this:

def trial():
    class Foo(object):
        def __init__(self):
            print("Hello, world!")
    Foo()
trial()


Or this:

class Foo(object):
    def __init__(self):
        print("Hello, world!")

def trial():
    Foo()
trial()


Cheers,
Chris
--
http://rebertia.com


From nad at acm.org  Wed Sep 28 18:21:25 2011
From: nad at acm.org (Ned Deily)
Date: Wed, 28 Sep 2011 15:21:25 -0700
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <nad-47A451.15212528092011@news.gmane.org>

In article <4e82a1a1$0$29965$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> On Tue, 27 Sep 2011 14:32:43 -0700, Wanderer wrote:
> > I need to stay in sink with the rest of the company which is still using
> > 2.6 flavors. There was some investigation into going to Python 3 but not
> > enough of the libraries we use were available. I'll install 2.6.6. I
> > don't think the security stuff really effects me. I think it is strange
> > to release a security update but not really expect people to use it.
> 
> 
> More likely the person who builds the Windows installers just hasn't made 
> a new release yet.
> 
> The Python development team is relatively small and chronically busy: too 
> much to do and not enough time to do it. As I understand it, most of them 
> use Linux, so I'm afraid that Windows sometimes takes a back seat. (At 
> least it's not Mac OS, which is stuck riding in the boot of the car, or 
> the other semi-supported OSes, which are on a skateboard desperately 
> hanging onto the bumper trying not to be left behind.)

No, it was a deliberate decision.  After a release is in security-fix 
mode only, we don't build Windows or Mac OS X installers for them.  The 
emphasis is on the actively maintained release branches, currently 3.2.x 
and 2.7.x.  If third-party distributors want to support their users with 
binary installers, that is of course their option.

"Python 2.6.7 is a security-fix only source release for Python 2.6.6, 
fixing several reported security issues. Python 2.6.7 was released on 
June 3, 2011.

Python 2.6 is now in security-fix-only mode; no new features are being 
added, and no new bug fix releases are planned. We intend to provide 
source-only security fixes for the Python 2.6 series until October 2013 
(five years after the 2.6 final release). For ongoing maintenance 
releases, please see the Python 2.7 series."

http://www.python.org/getit/releases/2.6.7/

(And I think you may be just slightly mischaracterizing the status of 
both Mac OS X and Windows support.)

-- 
 Ned Deily,
 nad at acm.org



From gagsl-py2 at yahoo.com.ar  Wed Sep 28 18:30:01 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 28 Sep 2011 19:30:01 -0300
Subject: syntactic sugar for def?
References: <4E8390F1.9060207@stoneleaf.us>
	<CAJ6cK1bFFK=HOgR+TG=tkbMRUZyRxgYLH8mLfM2kXOQbZrJfKQ@mail.gmail.com>
	<CALvWhxvi3vb5uXpEUqeLkhYa2322wPi+DKRC=Goa-oTnftV8cw@mail.gmail.com>
Message-ID: <op.v2jh4bnbx6zn5v@lepton>

En Wed, 28 Sep 2011 18:51:00 -0300, Chris Kaynor  
<ckaynor at zindagigames.com> escribi?:

> On Wed, Sep 28, 2011 at 2:37 PM, Arnaud Delobelle <arnodel at gmail.com>  
> wrote:
>> On 28 September 2011 22:26, Ethan Furman <ethan at stoneleaf.us> wrote:
>>> I remember that 'class' is sugar for type(....).
>>>
>>> I don't remember if 'def' is sugar for something besides lambda.
>>>
>>> Any clues for me?  Heck, I'll even be grateful for outright answers!
>>
>> It's not really sugar.  But I think you mean something like this:
>>
>>
>>>>> class A: pass
>> ...
>>>>> type(A)
>> <class 'type'>
>>>>> type is type(A)
>> True
>>
>> So the closest you get for functions will be:
>>
>>>>> def f(): pass
>> ...
>>>>> type(f)
>> <class 'function'>
>>
>> Try help(type(f)) to see how to use it to create a function object.
>> The problem is that you need to provide a code object, and the easiest
>> way to create a code object is to use a def statement :)
>
> I would say compile isn't too much harder to use:
>>>> c = compile('a = 123', 'test', 'exec')
>>>> d = {}
>>>> f = types.FunctionType(c, d, 'test')
>>>> f()
>>>> print d
> {'a': 123}
>
> Although it appears you get all of the variables defined as global
> apparently (try "f = types.FunctionType(c, globals(), 'test')"
> instead).

I know no way of compiling a function body alone. Suppose you have this  
function:

def foo(x):
   print x
   y = 2*x
   return y

py> compile("  print x\n  y = 2*x\n  return y", "<string>", "exec")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "<string>", line 1
     print x
     ^
IndentationError: unexpected indent
py> compile("print x\ny = 2*x\nreturn y", "<string>", "exec")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "<string>", line 3
SyntaxError: 'return' outside function

If you include the 'def' statement in the source string, the resulting  
code object does not represent the function itself, but a "module"  
defining it:

py> f = FunctionType(compile("def foo(x):\n print x\n y = 2*x\n return  
y\n",
...       "<string>", "exec"), globals(), "foo")
py> f(3)
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: <module>() takes no arguments (1 given)
py> dis.dis(f)
   1           0 LOAD_CONST               0 (<code object foo at 00C0FAD0,  
file "<string>", line 1>)
               3 MAKE_FUNCTION            0
               6 STORE_NAME               0 (foo)
               9 LOAD_CONST               1 (None)
              12 RETURN_VALUE

To get at the actual function code, one should use  
f.func_code.co_consts[0]; this would be the 'code' parameter for  
types.FunctionType. Very complicated, really; nothing can beat the 'def'  
statement for defining a function ;)

-- 
Gabriel Genellina



From ericsnowcurrently at gmail.com  Wed Sep 28 18:38:26 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Wed, 28 Sep 2011 16:38:26 -0600
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <CALFfu7CgRZFNmrEfwqMp=nDwfrH_Doqs0CZPFNpZT=3pEg+Hgg@mail.gmail.com>

On Wed, Sep 28, 2011 at 3:26 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> I remember that 'class' is sugar for type(....).
>
> I don't remember if 'def' is sugar for something besides lambda.

This is something I have thought about a lot since PyCon this year.  I
apologize in advance.  <wink>

Since 3.0, class statements are syntactic sugar for some extra steps
beyond "meta(...)" [1].  In CPython this is facilitated through the
"hidden" __build_class__() builtin[2].  We have the __import__()
builtin for customizing module creation. But, as you asked, what about
functions?

Currently there isn't a way to customize function creation.  There is
no __build_function__() builtin.  The best you can do is, like others
have said, directly call FunctionType(...) or type(f)(...) where f is
an existing function.

I expect that if there were a __build_function__, it would wrap the
code that is currently run for the MAKE_FUNCTION/MAKE_CLOSURE
opcodes[3].

Also, both modules and classes have mechanisms built-in to allow for
customization in certain parts of the creation process (PEP 302[4] and
metaclasses[5], respectively).  Functions lack this as well, though
there hasn't been a big clamor for it.  :)  Nick Coghlan proposed an
interesting idea for this in March[6], with some later follow-up[7].
Nothing much came of it though.

Definitely an interesting topic, which has led me to learn a lot about
Python and CPython.

-eric

[1] http://www.python.org/dev/peps/pep-3115/
     http://mail.python.org/pipermail/python-3000/2007-March/006338.html
[2] http://hg.python.org/cpython/file/default/Python/bltinmodule.c#l35
[3] http://hg.python.org/cpython/file/default/Python/ceval.c#l2680
[4] http://www.python.org/dev/peps/pep-0302/
     http://docs.python.org/release/2.3.5/whatsnew/section-pep302.html
     http://docs.python.org/dev/reference/simple_stmts.html#the-import-statement
[5] http://docs.python.org/dev/reference/datamodel.html#customizing-class-creation
     http://www.python.org/doc/essays/metaclasses/
[6] http://mail.python.org/pipermail/python-ideas/2011-March/009391.html
[7] http://mail.python.org/pipermail/python-ideas/2011-March/009625.html
     http://mail.python.org/pipermail/python-ideas/2011-April/009765.html

>
> Any clues for me? ?Heck, I'll even be grateful for outright answers!
>
> ~Ethan~
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tjreedy at udel.edu  Wed Sep 28 19:01:11 2011
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 28 Sep 2011 19:01:11 -0400
Subject: syntactic sugar for def?
In-Reply-To: <4E8390F1.9060207@stoneleaf.us>
References: <4E8390F1.9060207@stoneleaf.us>
Message-ID: <j608vt$hcs$1@dough.gmane.org>

On 9/28/2011 5:26 PM, Ethan Furman wrote:

> I don't remember if 'def' is sugar for something besides lambda.

That is a bit backwards.
   lambda x: expr(x)
is syntactic sugar for
   def <lambda>(x): return expr(x)
   del <lambda>
;-)

-- 
Terry Jan Reedy



From greg.ewing at canterbury.ac.nz  Wed Sep 28 19:01:27 2011
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 29 Sep 2011 12:01:27 +1300
Subject: Wrote a new library - Comments and suggestions please!
In-Reply-To: <4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
References: <2fdf5f8c-58f1-4708-8856-a52c7233f3e6@v9g2000vbp.googlegroups.com>
	<abd0877f-2feb-4160-8c8d-0cf4bc5c9622@18g2000yqz.googlegroups.com>
	<13649656.542.1317133453243.JavaMail.geo-discussion-forums@yqnk41>
	<mailman.1501.1317138605.27778.python-list@python.org>
	<4e8208da$0$29994$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <9ehnaaF35hU1@mid.individual.net>

Steven D'Aprano wrote:

> I googled on "SAS PROC FREQ" and found this:
> 
> http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/default/procstat_freq_sect006.htm
> 
> Documentation like that really makes me appreciate the sterling work done on
> Python's docs.

I think you have to read it in context. A couple of levels up
there is a section called "The FREQ Procedure" which seems to
explain more about what's going on, including examples. (I
didn't look too closely at it, though, in case my eyes started
to bleed...)

-- 
Greg


From tim at akwebsoft.com  Wed Sep 28 19:26:51 2011
From: tim at akwebsoft.com (Tim Johnson)
Date: Wed, 28 Sep 2011 15:26:51 -0800
Subject: Suggested coding style
In-Reply-To: <ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <20110928232651.GT19422@johnsons-web.com>

* DevPlayer <devplayer at gmail.com> [110928 04:31]:
> On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
> > rantingrick <rantingr... at gmail.com> wrote:
> > > Since, like the bible
> > > the zen is self contradicting, any argument utilizing the zen can be
> > > defeated utilizing the zen.
> >
> > And like the Bible, the Zen was created by humans as a joke. If you're
> > taking it too seriously, that's your problem.
> >
> > > If however you want to learn about the accepted rules for formatting
> > > code then you need to read "PEP-8"! PEP 8 is our style guide.
> >
> Contradiction is only seen by narrow perspectve.
> 
> Calling the Bible a joke is used to hurt people, not enlighten them.
> Those words show bitter arrogance, not constructive critism as it
> ignores how others feel about that book. What benefit to others is
> gained by calling someones belief a joke? 

 My wife and I are devout christians, but not fundamentalist. We
 would not take rantingrick too seriously. If _you_ take him
 seriously, you're just giving him 'street cred'.

-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com


From nobody at nowhere.com  Wed Sep 28 20:10:38 2011
From: nobody at nowhere.com (Nobody)
Date: Thu, 29 Sep 2011 01:10:38 +0100
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1543.1317248503.27778.python-list@python.org>
Message-ID: <pan.2011.09.29.00.10.37.975000@nowhere.com>

On Wed, 28 Sep 2011 15:21:25 -0700, Ned Deily wrote:

> No, it was a deliberate decision.  After a release is in security-fix 
> mode only, we don't build Windows or Mac OS X installers for them.

But you continue to offer the installers for the unfixed version.



From steve+comp.lang.python at pearwood.info  Wed Sep 28 20:16:30 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 10:16:30 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
Message-ID: <4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>

Tim Chase wrote:

> While I asked this on the Django list as it happened to be with
> some Django testing code, this might be a more generic Python
> question so I'll ask here too.
> 
> When performing unittest tests, I have a number of methods of the
> form
> 
>    def test_foo(self):
>      data = (
>        (item1, result1),
>        ... #bunch of tests for fence-post errors
>        )
>      for test, result in data:
>        self.assertEqual(process(test), result)
> 
> When I run my tests, I only get a tick for running one the one
> test (test_foo), not the len(data) tests that were actually
> performed.  Is there a way for unittesting to report the number
> of passed-assertions rather than the number of test-methods run?

I used to ask the same question, but then I decided that if I wanted each
data point to get its own tick, I should bite the bullet and write an
individual test for each.

If you really care, you could subclass unittest.TestCase, and then cause
each assert* method to count how often it gets called. But really, how much
detailed info about *passed* tests do you need? 

If you are writing loops inside tests, you might find this anecdote useful:

http://mail.python.org/pipermail/python-list/2011-April/1270640.html



-- 
Steven



From cmpython at gmail.com  Wed Sep 28 20:39:52 2011
From: cmpython at gmail.com (CM)
Date: Wed, 28 Sep 2011 17:39:52 -0700 (PDT)
Subject: options for plotting points on geographic map
Message-ID: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>

Recommendations sought for using Python to plot points/custom markers
(and maybe other things?) on a map of an area of the U.S. of maybe 100
miles radius.  (This would be a "political" map showing towns, such as
from Google Maps or Mapquest, and not a "physical" map).  I'll need to
place markers or something based on zip codes.

I see there is pymaps, a Python wrapper for Google Maps.  I may try
that but it seems to be barely documented and would require making a
webpage with javascript to display the map, whereas I'd probably
prefer a desktop app for this--though I'd consider a web page (it's
probably easier than I think).

I already use Matplotlib, but its Basemap seems to be only for
physical geography needs.

Are there other options one might recommend?  (It is a little hard to
Google for this given the map() function).

Thanks,
Che


From zzzzysilence at gmail.com  Wed Sep 28 20:42:09 2011
From: zzzzysilence at gmail.com (Bertha Jonanna)
Date: Wed, 28 Sep 2011 17:42:09 -0700 (PDT)
Subject: red bull hats, snapback hats, hello kitty hats, monster energy hats
	of http://www.currenthats.com/
Message-ID: <8edb383c-c6c7-4bc4-8b54-13c94a5c6493@18g2000yqz.googlegroups.com>

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promotional shop from monster energy hats. It was authorized to
provide red bull hats?snapback hats?hello kitty hats and the
fashionable sports items to meet red bull hats Fans shopping needs.


From zzzzysilence at gmail.com  Wed Sep 28 20:46:10 2011
From: zzzzysilence at gmail.com (Bertha Jonanna)
Date: Wed, 28 Sep 2011 17:46:10 -0700 (PDT)
Subject: red bull hats, snapback hats, hello kitty hats, monster energy hats
	of http://www.currenthats.com/
Message-ID: <c99fe5dc-775c-4d55-91cd-d0900e7ce5d2@h34g2000yqd.googlegroups.com>

Welcome to the www. currenthats.com,. The currenthats.com is a
promotional shop from monster energy hats. It was authorized to
provide red bull hats?snapback hats?hello kitty hats and the
fashionable sports items to meet red bull hats Fans shopping needs.


From roy at panix.com  Wed Sep 28 20:49:24 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 20:49:24 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-DF6FAC.20492428092011@news.panix.com>

In article <4e83b8e0$0$29972$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> If you are writing loops inside tests, you might find this anecdote useful:
> 
> http://mail.python.org/pipermail/python-list/2011-April/1270640.html

On the other hand, the best test is one that gets written.  I will often 
write tests that I know do not meet the usual standards of purity and 
wholesomeness.  Here's a real-life example:

    for artist in artists:
        name = artist['name']
        self.assertIsInstance(name, unicode)
        name = name.lower()
        # Due to fuzzy matching, it's not strictly guaranteed that the 
        # following assertion is true, but it works in this case.  
        self.assertTrue(name.startswith(term), (name, term))

Could I have written the test without the loop?  Probably.  Would it 
have been a better test?  I guess, at some level, probably.  And, of 
course, the idea of a "not strictly guaranteed" assertion is probably 
enough to make me lose my Unit Tester's Guild Secret Decoder Ring 
forever :-)

But, the test was quick and easy to write, and provides value.  I could 
have spent twice as long writing a better test, and it would have 
provided a little more value, but certainly not double.  More 
importantly, had I spent the extra time writing the better test, I might 
have not had enough time to write all the other tests I wrote that day.

Sometimes good enough is good enough.


From jeanpierreda at gmail.com  Wed Sep 28 20:50:03 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Wed, 28 Sep 2011 20:50:03 -0400
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJLMV+Wez60xPzKyrFE1nrLw+H=iHZ5QxjEXp-1wngpHbQ@mail.gmail.com>

> I used to ask the same question, but then I decided that if I wanted each
> data point to get its own tick, I should bite the bullet and write an
> individual test for each.

Nearly the entire re module test suite is a list of tuples. If it was
instead a bunch of TestCase classes, there'd be a lot more boilerplate
to write. (At a bare minimum, there'd be two times as many lines, and
all the extra lines would be identical...)

Why is writing boilerplate for a new test a good thing? It discourages
the authorship of tests. Make it as easy as possible by e.g. adding a
new thing to whatever you're iterating over. This is, for example, why
the nose test library has a decorator for generating a test suite from
a generator.

Devin

On Wed, Sep 28, 2011 at 8:16 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Tim Chase wrote:
>
>> While I asked this on the Django list as it happened to be with
>> some Django testing code, this might be a more generic Python
>> question so I'll ask here too.
>>
>> When performing unittest tests, I have a number of methods of the
>> form
>>
>> ? ?def test_foo(self):
>> ? ? ?data = (
>> ? ? ? ?(item1, result1),
>> ? ? ? ?... #bunch of tests for fence-post errors
>> ? ? ? ?)
>> ? ? ?for test, result in data:
>> ? ? ? ?self.assertEqual(process(test), result)
>>
>> When I run my tests, I only get a tick for running one the one
>> test (test_foo), not the len(data) tests that were actually
>> performed. ?Is there a way for unittesting to report the number
>> of passed-assertions rather than the number of test-methods run?
>
> I used to ask the same question, but then I decided that if I wanted each
> data point to get its own tick, I should bite the bullet and write an
> individual test for each.
>
> If you really care, you could subclass unittest.TestCase, and then cause
> each assert* method to count how often it gets called. But really, how much
> detailed info about *passed* tests do you need?
>
> If you are writing loops inside tests, you might find this anecdote useful:
>
> http://mail.python.org/pipermail/python-list/2011-April/1270640.html
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From roy at panix.com  Wed Sep 28 20:52:31 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 20:52:31 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
Message-ID: <roy-0A695E.20523128092011@news.panix.com>

In article <87k48szqo1.fsf at benfinney.id.au>,
 Ben Finney <ben+python at benfinney.id.au> wrote:

> Worse, if one of the scenarios causes the test to fail, the loop will
> end and you won't get the results for the remaining scenarios.

Which, depending on what you're doing, may or may not be important.  In 
many cases, there's only two states of interest:

1) All tests pass

2) Anything else


From steve+comp.lang.python at pearwood.info  Wed Sep 28 21:14:04 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 11:14:04 +1000
Subject: [OT] Benefit and belief [was Re: Suggested coding style]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>

DevPlayer wrote:

> On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
>> And like the Bible, the Zen was created by humans as a joke. If you're
>> taking it too seriously, that's your problem.
[...]
> Calling the Bible a joke is used to hurt people, not enlighten them.
> Those words show bitter arrogance, not constructive critism as it
> ignores how others feel about that book. What benefit to others is 
> gained by calling someones belief a joke? 

It is the same benefit as the little boy who pointed out that the Emperor
was not wearing any clothes. (In real life, the story was called "The
Little Boy Who Said The Emperor Wasn't Wearing Any Clothes, and Got
Arrested and Thrown in Prison Together With His Parents for Insulting The
Emperor".)


> To put the "believers" minds 
> straight? I think not. I think the unsensitive person who attackes
> others beliefs, even if illogical or unrealistic, is after some kind
> of self grandizement or to illude themself into thinking "they know
> the truth of the universe" and should attack others to prove they do.

There is a difference between attacking ideas and attacking people.

"The Bible is a joke" attacks the idea.

"Insensitive people after self-aggrandisement deluding themselves" attacks
the person.

We live in a world where religion is privileged, where governments pander to
the most sick and twisted, hateful, bigoted beliefs because of religion,
where organised conspiracies to support and protect child molesters and
sexual predators are nevertheless looked up to as sources of morality.

There are some ideas that are simply incompatible with civilization, and the
idea that religious beliefs should be beyond criticism is one of them.
Forget money, or even the love of money. The idea that one mustn't
criticise another person's beliefs is the root of all evil.



-- 
Steven



From jeanpierreda at gmail.com  Wed Sep 28 21:40:27 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Wed, 28 Sep 2011 21:40:27 -0400
Subject: [OT] Benefit and belief [was Re: Suggested coding style]
In-Reply-To: <4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJKRaFyQbQ=EVBOE0YoOCmCTEXwh+t7W7f_uthbM-tY=cA@mail.gmail.com>

> Forget money, or even the love of money. The idea that one mustn't
> criticise another person's beliefs is the root of all evil.

This was a technical discussion, and calling the bible a joke was not
necessary at all. It creates a hostile atmosphere.

Can't you pick somewhere else to attack Christianity?

Devin

On Wed, Sep 28, 2011 at 9:14 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> DevPlayer wrote:
>
>> On Sep 27, 10:25?pm, alex23 <wuwe... at gmail.com> wrote:
>>> And like the Bible, the Zen was created by humans as a joke. If you're
>>> taking it too seriously, that's your problem.
> [...]
>> Calling the Bible a joke is used to hurt people, not enlighten them.
>> Those words show bitter arrogance, not constructive critism as it
>> ignores how others feel about that book. What benefit to others is
>> gained by calling someones belief a joke?
>
> It is the same benefit as the little boy who pointed out that the Emperor
> was not wearing any clothes. (In real life, the story was called "The
> Little Boy Who Said The Emperor Wasn't Wearing Any Clothes, and Got
> Arrested and Thrown in Prison Together With His Parents for Insulting The
> Emperor".)
>
>
>> To put the "believers" minds
>> straight? I think not. I think the unsensitive person who attackes
>> others beliefs, even if illogical or unrealistic, is after some kind
>> of self grandizement or to illude themself into thinking "they know
>> the truth of the universe" and should attack others to prove they do.
>
> There is a difference between attacking ideas and attacking people.
>
> "The Bible is a joke" attacks the idea.
>
> "Insensitive people after self-aggrandisement deluding themselves" attacks
> the person.
>
> We live in a world where religion is privileged, where governments pander to
> the most sick and twisted, hateful, bigoted beliefs because of religion,
> where organised conspiracies to support and protect child molesters and
> sexual predators are nevertheless looked up to as sources of morality.
>
> There are some ideas that are simply incompatible with civilization, and the
> idea that religious beliefs should be beyond criticism is one of them.
> Forget money, or even the love of money. The idea that one mustn't
> criticise another person's beliefs is the root of all evil.
>
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From gagsl-py2 at yahoo.com.ar  Wed Sep 28 21:49:25 2011
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 28 Sep 2011 22:49:25 -0300
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1543.1317248503.27778.python-list@python.org>
	<pan.2011.09.29.00.10.37.975000@nowhere.com>
Message-ID: <op.v2jrcnfxx6zn5v@lepton>

En Wed, 28 Sep 2011 21:10:38 -0300, Nobody <nobody at nowhere.com> escribi?:

> On Wed, 28 Sep 2011 15:21:25 -0700, Ned Deily wrote:
>
>> No, it was a deliberate decision.  After a release is in security-fix
>> mode only, we don't build Windows or Mac OS X installers for them.
>
> But you continue to offer the installers for the unfixed version.

As well as all the previous ones back to Python 1.x

I can think of several alternatives:

* Upgrade to Python 2.7, the current stable and maintained release.

* Compile Python 2.6.7 yourself. For the 32 bits version, you may use  
Microsoft Visual C++ 2008 Express Edition (free/gratis); see  
PCbuild\readme.txt for details. Obtain the required dependencies using  
Tools\buildbot\external.bat. It compiles cleanly out of the box.

* Obtain the compiled binary somewhere else. Considering that 2.6.7 is  
just a security patch, I'm not sure if running a precompiled binary from  
untrusted sources is any better than sticking with the official, previous  
version. I've built the binaries, in case you're interested.

* Compare both source trees and look at their differences. Most of them  
are in Python modules that you can just drop over an existing 2.6.6  
install. Only two C modules have changed, and require rebuilding  
python26.dll:

  timemodule.c r87648: Issue #8013: Fixed time.asctime segfault when OS's  
asctime fails
  unicodedata.c http://bugs.python.org/issue10254

If you think you're not affected by these, just ignore 2.6.7 (or apply  
only the .py changes)

-- 
Gabriel Genellina



From rantingrick at gmail.com  Wed Sep 28 21:59:49 2011
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 28 Sep 2011 18:59:49 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <42df7e77-44ab-405e-9c60-8f394e3e5628@d17g2000yqa.googlegroups.com>

On Sep 27, 11:25?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:

> The Python development team is relatively small and chronically busy: too
> much to do and not enough time to do it.

If that is the case then why do they snub their noses at anyone who
wishes to help? What kind of people would chase off good help just to
save ego? I imagine the folks at py dev sort of like a dying man in
need of a heart transplant; the man informs the doctor that he would
happy to get a transplant but not if the heart came from a jew, asian,
african, latin, russian, or canuck.


From ericsnowcurrently at gmail.com  Wed Sep 28 22:01:14 2011
From: ericsnowcurrently at gmail.com (Eric Snow)
Date: Wed, 28 Sep 2011 20:01:14 -0600
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <CABicbJLMV+Wez60xPzKyrFE1nrLw+H=iHZ5QxjEXp-1wngpHbQ@mail.gmail.com>
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJLMV+Wez60xPzKyrFE1nrLw+H=iHZ5QxjEXp-1wngpHbQ@mail.gmail.com>
Message-ID: <CALFfu7AvqCLRinj=RvWrUixkJgiDCh0wZDbtysw_cdRw9tecUg@mail.gmail.com>

On Wed, Sep 28, 2011 at 6:50 PM, Devin Jeanpierre
<jeanpierreda at gmail.com> wrote:
>> I used to ask the same question, but then I decided that if I wanted each
>> data point to get its own tick, I should bite the bullet and write an
>> individual test for each.
>
> Nearly the entire re module test suite is a list of tuples. If it was
> instead a bunch of TestCase classes, there'd be a lot more boilerplate
> to write. (At a bare minimum, there'd be two times as many lines, and
> all the extra lines would be identical...)
>
> Why is writing boilerplate for a new test a good thing? It discourages
> the authorship of tests. Make it as easy as possible by e.g. adding a
> new thing to whatever you're iterating over. This is, for example, why
> the nose test library has a decorator for generating a test suite from
> a generator.

+1

>
> Devin
>
> On Wed, Sep 28, 2011 at 8:16 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> Tim Chase wrote:
>>
>>> While I asked this on the Django list as it happened to be with
>>> some Django testing code, this might be a more generic Python
>>> question so I'll ask here too.
>>>
>>> When performing unittest tests, I have a number of methods of the
>>> form
>>>
>>> ? ?def test_foo(self):
>>> ? ? ?data = (
>>> ? ? ? ?(item1, result1),
>>> ? ? ? ?... #bunch of tests for fence-post errors
>>> ? ? ? ?)
>>> ? ? ?for test, result in data:
>>> ? ? ? ?self.assertEqual(process(test), result)
>>>
>>> When I run my tests, I only get a tick for running one the one
>>> test (test_foo), not the len(data) tests that were actually
>>> performed. ?Is there a way for unittesting to report the number
>>> of passed-assertions rather than the number of test-methods run?
>>
>> I used to ask the same question, but then I decided that if I wanted each
>> data point to get its own tick, I should bite the bullet and write an
>> individual test for each.
>>
>> If you really care, you could subclass unittest.TestCase, and then cause
>> each assert* method to count how often it gets called. But really, how much
>> detailed info about *passed* tests do you need?
>>
>> If you are writing loops inside tests, you might find this anecdote useful:
>>
>> http://mail.python.org/pipermail/python-list/2011-April/1270640.html
>>
>>
>>
>> --
>> Steven
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rantingrick at gmail.com  Wed Sep 28 22:11:08 2011
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 28 Sep 2011 19:11:08 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
Message-ID: <dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>

On Sep 28, 6:26?pm, Tim Johnson <t... at akwebsoft.com> wrote:
> * DevPlayer <devpla... at gmail.com> [110928 04:31]:
> > On Sep 27, 10:25 pm, alex23 <wuwe... at gmail.com> wrote:
> > > rantingrick <rantingr... at gmail.com> wrote:
> > > > Since, like the bible
> > > > the zen is self contradicting, any argument utilizing the zen can be
> > > > defeated utilizing the zen.
>
> > > And like the Bible, the Zen was created by humans as a joke. If you're
> > > taking it too seriously, that's your problem.
>
> > > > If however you want to learn about the accepted rules for formatting
> > > > code then you need to read "PEP-8"! PEP 8 is our style guide.
>
> > Contradiction is only seen by narrow perspectve.
>
> > Calling the Bible a joke is used to hurt people, not enlighten them.
> > Those words show bitter arrogance, not constructive critism as it
> > ignores how others feel about that book. What benefit to others is
> > gained by calling someones belief a joke?
>
> ?My wife and I are devout christians, but not fundamentalist. We
> ?would not take rantingrick too seriously. If _you_ take him
> ?seriously, you're just giving him 'street cred'.

DevPlayer was not even talking about what i said, he was replying to a
statement by Alex23 who said (and i quote) "And like the Bible, the
Zen was created by humans as a joke". Maybe you should spend the next
fifteen or so minutes catching up to the conversation...(?_?)...of
course only *after* you clean that egg from your face.


From devplayer at gmail.com  Wed Sep 28 22:15:24 2011
From: devplayer at gmail.com (DevPlayer)
Date: Wed, 28 Sep 2011 19:15:24 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
Message-ID: <088ba6ac-4468-4755-9336-f1ddf1ab2121@k15g2000yqd.googlegroups.com>

Oh I was just testing my intellecual-enlightenment-from-ranter-
conversation algorithm found in a previous post. I think my OOP model
failed as I'm just too tired to finished that pattern test. He had
some good points which fit the process I layed out. But the original
topic is just so much better:

Suggested coding style Options





From ben+python at benfinney.id.au  Wed Sep 28 22:25:41 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 12:25:41 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<4e83b8e0$0$29972$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <878vp83x0a.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I used to ask the same question, but then I decided that if I wanted
> each data point to get its own tick, I should bite the bullet and
> write an individual test for each.

Hence my advocating the ?testscenarios? library. Have you tried that?

It allows the best of both worlds: within the class, you write a
collection of data scenarios, and write one test case for each separate
behaviour, and that's all that appears in the code; but the test run
shows every test case for every scenario.

E.g. with a ParrotTestCase class having three test cases and four
scenarios, the test run will run the full combination of all of them and
report twelve distinct test cases and the result for each.

So the ?bite the bullet? you describe isn't necessary to get what you
want.

> If you really care, you could subclass unittest.TestCase, and then
> cause each assert* method to count how often it gets called. But
> really, how much detailed info about *passed* tests do you need?

The ?testscenarios? library does subclass the standard library
?unittest? module.

But as explained elsewhere, it's not the counting which is the issue.
The issue is to ensure (and report) that every test case is actually
tested in isolation against every relevant scenario.

-- 
 \            ?Human reason is snatching everything to itself, leaving |
  `\              nothing for faith.? ?Bernard of Clairvaux, 1090?1153 |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Wed Sep 28 22:27:27 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 12:27:27 +1000
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
Message-ID: <874nzw3wxc.fsf@benfinney.id.au>

Roy Smith <roy at panix.com> writes:

> In article <87k48szqo1.fsf at benfinney.id.au>,
>  Ben Finney <ben+python at benfinney.id.au> wrote:
>
> > Worse, if one of the scenarios causes the test to fail, the loop will
> > end and you won't get the results for the remaining scenarios.
>
> Which, depending on what you're doing, may or may not be important.  In 
> many cases, there's only two states of interest:
>
> 1) All tests pass
>
> 2) Anything else

For the purpose of debugging, it's always useful to more specifically
narrow down the factors leading to failure.

-- 
 \      ?A lie can be told in a few words. Debunking that lie can take |
  `\   pages. That is why my book? is five hundred pages long.? ?Chris |
_o__)                                                Rodda, 2011-05-05 |
Ben Finney


From wuwei23 at gmail.com  Wed Sep 28 22:41:51 2011
From: wuwei23 at gmail.com (alex23)
Date: Wed, 28 Sep 2011 19:41:51 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
Message-ID: <22c6d97a-a0f3-43e8-ac23-16787db5da1d@g33g2000yqc.googlegroups.com>

On Sep 28, 10:12?pm, DevPlayer <devpla... at gmail.com> wrote:
> Calling the Bible a joke is used to hurt people, not enlighten them.

Y'know, I wouldn't even bother responding to this if Xianists were as
open, forgiving and accepting as their messiah told them to be. It was
a *flippant remark*. If you want to establish intent, aggression and
religio-politico-philosophy from every throwaway remark made on the
internet, you're not really going to have much time for Python.

My belief system isn't your's. Hell, my belief system doesn't even
require that I have *any respect whatsoever* for your's. If it's okay
for Xianists to "suffer not a witch to live", then I'm going to assert
my making light jokes about those whose world view is in direct
opposition to mine isn't even comparable to that mentality.

from attitude import humour

(Since we're already fully derailed here, I've always preferred
Borges' suggestion that it was actually Judas who carried the full
weight of man's sins, given that his betrayal of Christ and inevitable
condemnation to hell was a necessity. Then again, I'm able to safely
view this as *allegory* and am genuinely interested in the opinions of
modern minds over something first begun by nomads millenia ago...)




From roy at panix.com  Wed Sep 28 22:49:58 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 22:49:58 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
	<874nzw3wxc.fsf@benfinney.id.au>
Message-ID: <roy-C4E4C5.22495828092011@news.panix.com>

In article <874nzw3wxc.fsf at benfinney.id.au>,
 Ben Finney <ben+python at benfinney.id.au> wrote:

> Roy Smith <roy at panix.com> writes:
> 
> > In article <87k48szqo1.fsf at benfinney.id.au>,
> >  Ben Finney <ben+python at benfinney.id.au> wrote:
> >
> > > Worse, if one of the scenarios causes the test to fail, the loop will
> > > end and you won't get the results for the remaining scenarios.
> >
> > Which, depending on what you're doing, may or may not be important.  In 
> > many cases, there's only two states of interest:
> >
> > 1) All tests pass
> >
> > 2) Anything else
> 
> For the purpose of debugging, it's always useful to more specifically
> narrow down the factors leading to failure.

Well, sure, but "need to debug" is just a consequence of being in state 
2.  If a test fails and I can't figure out why, I can always go back and 
add additional code to the test case to extract additional information.


From ben+python at benfinney.id.au  Wed Sep 28 23:05:36 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 13:05:36 +1000
Subject: [OT] Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
Message-ID: <87zkho2glb.fsf@benfinney.id.au>

Devin Jeanpierre <jeanpierreda at gmail.com> writes:

> > Forget money, or even the love of money. The idea that one mustn't
> > criticise another person's beliefs is the root of all evil.
>
> This was a technical discussion, and calling the bible a joke was not
> necessary at all. It creates a hostile atmosphere.

I disagree. It was not an attack on any person nor group of people. If
we are to be required to avoid jokes not directed at people, then *that*
is an atmosphere hostile to open friendly discussion.

> Can't you pick somewhere else to attack Christianity?

The person who wrote the ?bible is a joke? intended it as a flippant
remark. Countless other flippant remarks pass through here all the time,
making jokes at the expense of some idea or other. Christianity will not
be an exception to that.

If you find someone attacking people, I'll join you in ostracising the
attacker. But no, don't attempt to silence jokes that attack an idea.

Off-topic? If we start discussing the content of the ideas being
attacked, yeah, I'd say religion is pretty off-topic.

But the topic of keeping this forum safe for technical discussion
entails that it must be safe for *any* idea to be the butt of a joke, be
it a religious text or the Zen of Python, and that is very much
on-topic.

-- 
 \         ?We demand rigidly defined areas of doubt and uncertainty!? |
  `\    ?Vroomfondel, _The Hitch-Hiker's Guide To The Galaxy_, Douglas |
_o__)                                                            Adams |
Ben Finney


From python.list at tim.thechases.com  Wed Sep 28 23:13:57 2011
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 28 Sep 2011 22:13:57 -0500
Subject: Unittest testing assert*() calls rather than methods?
In-Reply-To: <roy-0A695E.20523128092011@news.panix.com>
References: <mailman.1528.1317219432.27778.python-list@python.org>	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
Message-ID: <4E83E275.6060209@tim.thechases.com>

On 09/28/11 19:52, Roy Smith wrote:
> In many cases, there's only two states of interest:
>
> 1) All tests pass
>
> 2) Anything else

Whether for better or worse, at some places (such as a previous 
employer) the number (and accretion) of test-points is a 
marketing bullet-point for upgrades & new releases.

-tkc





From roy at panix.com  Wed Sep 28 23:20:27 2011
From: roy at panix.com (Roy Smith)
Date: Wed, 28 Sep 2011 23:20:27 -0400
Subject: Unittest testing assert*() calls rather than methods?
References: <mailman.1528.1317219432.27778.python-list@python.org>
	<87k48szqo1.fsf@benfinney.id.au>
	<roy-0A695E.20523128092011@news.panix.com>
	<mailman.1552.1317266045.27778.python-list@python.org>
Message-ID: <roy-A524D5.23202628092011@news.panix.com>

In article <mailman.1552.1317266045.27778.python-list at python.org>,
 Tim Chase <python.list at tim.thechases.com> wrote:

> On 09/28/11 19:52, Roy Smith wrote:
> > In many cases, there's only two states of interest:
> >
> > 1) All tests pass
> >
> > 2) Anything else
> 
> Whether for better or worse, at some places (such as a previous 
> employer) the number (and accretion) of test-points is a 
> marketing bullet-point for upgrades & new releases.

Never attribute to malice that which is adequately explained by the 
stupidity of the marketing department.


From rosuav at gmail.com  Thu Sep 29 00:27:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Thu, 29 Sep 2011 14:27:31 +1000
Subject: A Trivial Question
In-Reply-To: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
References: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
Message-ID: <CAPTjJmprBHpZWm6eDoASmymNVoe=38U8k2VqFGYcKbcf2Y0nkQ@mail.gmail.com>

On Thu, Sep 29, 2011 at 7:53 AM, Tayfun Kayhan
<tayfun92_kayhan at yahoo.com> wrote:
> def trial():
>    class Foo(object):
>       def __init__(self):
>          print("Hello, world!")
> trial() # not worked, as expected.

Python doesn't have "class declarations" in the way that some other
languages do. The 'class' statement is an executable statement - it
builds a class object and binds it to the name Foo, just like any
other assignment. The 'def' command builds a function object in a
similar fashion. So in your trial() function, you're defining a class
and binding it to the local name Foo; and then doing nothing with it.
It's perfectly legal, and as Chris Rebert suggests, you can make it
useful by instantiating Foo() objects inside trial().

ChrisA


From gaurav.gangalwar at gmail.com  Thu Sep 29 01:17:46 2011
From: gaurav.gangalwar at gmail.com (gaurav gangalwar)
Date: Thu, 29 Sep 2011 10:47:46 +0530
Subject: UnicodeDecodeError
Message-ID: <CAJiE4OkRseJAvRBxzt2tOzsp7A75ONd2fbpnCyVCrNwyOjebgQ@mail.gmail.com>

I am getting this error while some testing on Python2.6,

 File "/usr/lib64/python2.6/httplib.py", line 774, in _send_output     #msg
= "\r\n".join(self._buffer) UnicodeDecodeError: 'ascii' codec can't decode
byte 0xe1 in position 14: ordinal not in range(128)

I tried the change suggested on this link
http://web.archiveorange.com/archive/v/PJbOg9pxJoUpQA9AHp3X, its working
fine after that.

There seems to be some problem in httplib with unicode handling.
I am running it on centos5.
I am still not sure why its happening and what will be ideal solution for
this?

Thanks,
Gaurav
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From namenobodywants at gmail.com  Thu Sep 29 01:47:49 2011
From: namenobodywants at gmail.com (Sean McIlroy)
Date: Wed, 28 Sep 2011 22:47:49 -0700 (PDT)
Subject: change text of a Tkinter Button by clicking it
Message-ID: <b32d1d2b-0692-4050-9275-428dae2e2a25@5g2000yqo.googlegroups.com>

hello

(how) can you change the text of a Tkinter Button by clicking it?
something like

def click(index): return lambda: buttons[index].text = 'hello'
buttons = [Button(root,command=click(index)) for index in
range(numbuttons)]

only with an attribute that Buttons actually have. sorry to have to
ask such a see-spot-run question. thanks if you can help.

peace
stm


From namenobodywants at gmail.com  Thu Sep 29 02:15:20 2011
From: namenobodywants at gmail.com (Sean McIlroy)
Date: Wed, 28 Sep 2011 23:15:20 -0700 (PDT)
Subject: change text of a Tkinter Button by clicking it
References: <b32d1d2b-0692-4050-9275-428dae2e2a25@5g2000yqo.googlegroups.com>
Message-ID: <fd4eb890-b9ed-492a-b38f-9df8ac3ff2be@gd10g2000vbb.googlegroups.com>

never mind. i found it.


From questions.anon at gmail.com  Thu Sep 29 02:16:13 2011
From: questions.anon at gmail.com (questions anon)
Date: Thu, 29 Sep 2011 16:16:13 +1000
Subject: memory error
In-Reply-To: <CAN_=ogtoNm2Y2ubP9ou7h+fkQJXBQdNF26hJW79jH28tqdUrCg@mail.gmail.com>
References: <CAN_=ogtoNm2Y2ubP9ou7h+fkQJXBQdNF26hJW79jH28tqdUrCg@mail.gmail.com>
Message-ID: <CAN_=ogtfVgmZB=Ydspt1u_j0GHvQQ2sGyetnD7xTAEoGwTLcqg@mail.gmail.com>

Hello All,
I am still having trouble with memory errors when I try to process many
netcdf files.
Originally I would get the memory error as mentioned in the previous post
but when I added gc.collect() after each for loop I receive the error:
GEOS_ERROR: bad allocation
with no additional information!
The error use to occur at the point when a new netcdf file was to be opened
and plotted but with the things I have 'fixed' thanks to suggestions from
this list it seems to happen while processing the second file.
I am just trying to plot 3hourly data for each file and each file contains
hourly data for a month and I am trying to do this for many months.
It seems like I cannot close down the last file properly so the computer has
a clean memory to start the next one.
Any feedback will be greatly appreciated.
My latest version of the code:

######################

from netCDF4 import Dataset
import numpy as N
import matplotlib.pyplot as plt
from numpy import ma as MA
from mpl_toolkits.basemap import Basemap
from netcdftime import utime
from datetime import datetime
import os


shapefile1="E:/DSE_BushfireClimatologyProject/griddeddatasamples/test_GIS/DSE_REGIONS"
OutputFolder=r"E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/OutputsforValidation"

def plotrawdata(variable):
        if variable=='TSFC':
                ncvariablename='T_SFC'

MainFolder=r"E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/InputsforValidation/T_SFC/"
                ticks=[-5,0,5,10,15,20,25,30,35,40,45,50]
                Title='Surface Temperature'
                cmap=plt.cm.jet

        elif variable=='RHSFC':
                ncvariablename='RH_SFC'

MainFolder=r"E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/InputsforValidation/RH_SFC/"
                ticks=[0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
                Title='Surface RH'
                cmap=plt.cm.jet_r


fileforlatlon=Dataset("E:/DSE_BushfireClimatologyProject/griddeddatasamples/GriddedData/InputsforValidation/T_SFC/TSFC_1974_01/IDZ00026_VIC_ADFD_T_SFC.nc",
'r+', 'NETCDF4')
        LAT=fileforlatlon.variables['latitude'][:]
        LON=fileforlatlon.variables['longitude'][:]

        startperiod=raw_input("Start slice (e.g. 1 ): ")
        endperiod=raw_input("End slice (e.g. 2): ")
        skipperiod=raw_input("skip slice (e.g. 1): ")
        if startperiod == "":
                startperiod = None
        else:
                startperiod = int(startperiod)
        if endperiod == "":
                endperiod = None
        else:
                endperiod = int(endperiod)
        if skipperiod == "":
                skipperiod = None
        else:
                skipperiod= int(skipperiod)

        for (path, dirs, files) in os.walk(MainFolder):
                        for dir in dirs:
                                print dir
                        path=path+'/'

                        for ncfile in files:
                                if ncfile[-3:]=='.nc':
                                    print "dealing with ncfiles:",
path+ncfile
                                    ncfile=os.path.join(path,ncfile)
                                    ncfile=Dataset(ncfile, 'r+', 'NETCDF4')
                                    #global TSFC

variable=ncfile.variables[ncvariablename][startperiod:endperiod:skipperiod]

TIME=ncfile.variables['time'][startperiod:endperiod:skipperiod]

fillvalue=ncfile.variables[ncvariablename]._FillValue
                                    ncfile.close()

                                    for variable, TIME in
zip((variable[:]),(TIME[:])):
                                    #for variable, TIME in
zip((variable[sliceperiod]),(TIME[sliceperiod])):

                                            cdftime=utime('seconds since
1970-01-01 00:00:00')

ncfiletime=cdftime.num2date(TIME)
                                            print ncfiletime
                                            timestr=str(ncfiletime)
                                            d = datetime.strptime(timestr,
'%Y-%m-%d %H:%M:%S')
                                            date_string =
d.strftime('%Y%m%d_%H%M')
                                            #Set up basemap using mercator
projection
http://matplotlib.sourceforge.net/basemap/doc/html/users/merc.html
                                            map =
Basemap(projection='merc',llcrnrlat=-40,urcrnrlat=-33,

llcrnrlon=139.0,urcrnrlon=151.0,lat_ts=0,resolution='i')
                                            x,y=map(*N.meshgrid(LON,LAT))

map.drawcoastlines(linewidth=0.5)
                                            map.readshapefile(shapefile1,
'DSE_REGIONS')
                                            map.drawstates()

                                            plt.title(Title+' %s
UTC'%ncfiletime)

                                            CS = map.contourf(x,y,variable,
ticks, cmap=cmap)
                                            l,b,w,h =0.1,0.1,0.8,0.8
                                            cax = plt.axes([l+w+0.025, b,
0.025, h], )
                                            cbar=plt.colorbar(CS, cax=cax,
drawedges=True)

                                            #save map as *.png and plot
netcdf file

plt.savefig((os.path.join(OutputFolder,
ncvariablename+date_string+'UTC.png')))
                                            #plt.show()
                                            plt.close()


######################



On Wed, Sep 14, 2011 at 4:08 PM, questions anon <questions.anon at gmail.com>wrote:

> Hello All,
> I keep coming across a memory error when processing many netcdf files. I
> assume it has something to do with how I loop things and maybe need to close
> things off properly.
> In the code below I am looping through a bunch of netcdf files (each file
> is hourly data for one month) and within each netcdf file I am outputting a
> *png file every three hours.
> This works for one netcdf file but when it begins to process the next
> netcdf file I receive this memory error:
>
> *Traceback (most recent call last):
>   File
> "d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
> line 44, in <module>
>     TSFC=ncfile.variables['T_SFC'][:]
>   File "netCDF4.pyx", line 2473, in netCDF4.Variable.__getitem__
> (netCDF4.c:23094)
> MemoryError*
>
> To reduce processing requirements I have tried making the LAT and LON to
> only use [0] but I also receive an error:
>
> *Traceback (most recent call last):
>   File
> "d:/plot_netcdf_merc_multiplot_across_multifolders_mkdirs_memoryerror.py",
> line 75, in <module>
>     x,y=map(*N.meshgrid(LON,LAT))
>   File "C:\Python27\lib\site-packages\numpy\lib\function_base.py", line
> 3256, in meshgrid
>     numRows, numCols = len(y), len(x)  # yes, reversed
> TypeError: len() of unsized object*
>
> finally I have added gc.collect() in a couple of places but that doesn't
> seem to do anything to help.
> I am using :*Python 2.7.2 |EPD 7.1-2 (32-bit)| (default, Jul  3 2011,
> 15:13:59) [MSC v.1500 32 bit (Intel)] on win32*
> Any feedback will be greatly appreciated!
>
>
> from netCDF4 import Dataset
> import numpy
> import numpy as N
> import matplotlib.pyplot as plt
> from numpy import ma as MA
> from mpl_toolkits.basemap import Basemap
> from netcdftime import utime
> from datetime import datetime
> import os
> import gc
>
> print "start processing...."
>
> inputpath=r'E:/GriddedData/Input/'
> outputpath=r'E:/GriddedData/Validation/'
> shapefile1="E:/test_GIS/DSE_REGIONS"
> for (path, dirs, files) in os.walk(inputpath):
>     for dir in dirs:
>         print dir
>         sourcepath=os.path.join(path,dir)
>         relativepath=os.path.relpath(sourcepath,inputpath)
>         newdir=os.path.join(outputpath,relativepath)
>         if not os.path.exists(newdir):
>             os.makedirs(newdir)
>
>     for ncfile in files:
>         if ncfile[-3:]=='.nc':
>             print "dealing with ncfiles:", ncfile
>             ncfile=os.path.join(sourcepath,ncfile)
>             #print ncfile
>             ncfile=Dataset(ncfile, 'r+', 'NETCDF4')
>             TSFC=ncfile.variables['T_SFC'][:,:,:]
>             TIME=ncfile.variables['time'][:]
>             LAT=ncfile.variables['latitude'][:]
>             LON=ncfile.variables['longitude'][:]
>             fillvalue=ncfile.variables['T_SFC']._FillValue
>             TSFC=MA.masked_values(TSFC, fillvalue)
>             ncfile.close()
>             gc.collect()
>             print "garbage collected"
>
>
>             for TSFC, TIME in zip((TSFC[1::3]),(TIME[1::3])):
>                 print TSFC, TIME
>             #convert time from numbers to date and prepare it to have no
> symbols for saving to filename
>                 cdftime=utime('seconds since 1970-01-01 00:00:00')
>                 ncfiletime=cdftime.num2date(TIME)
>                 print ncfiletime
>                 timestr=str(ncfiletime)
>                 d = datetime.strptime(timestr, '%Y-%m-%d %H:%M:%S')
>                 date_string = d.strftime('%Y%m%d_%H%M')
>
>                 #Set up basemap using mercator projection
> http://matplotlib.sourceforge.net/basemap/doc/html/users/merc.html
>                 map =
> Basemap(projection='merc',llcrnrlat=-40,urcrnrlat=-33,
>
> llcrnrlon=139.0,urcrnrlon=151.0,lat_ts=0,resolution='i')
>
>             # compute map projection coordinates for lat/lon grid.
>                 x,y=map(*N.meshgrid(LON,LAT))
>                 map.drawcoastlines(linewidth=0.5)
>                 map.readshapefile(shapefile1, 'DSE_REGIONS')
>                 map.drawstates()
>
>                 plt.title('Surface temperature at %s UTC'%ncfiletime)
>                 ticks=[-5,0,5,10,15,20,25,30,35,40,45,50]
>                 CS = map.contourf(x,y,TSFC, ticks, cmap=plt.cm.jet)
>                 l,b,w,h =0.1,0.1,0.8,0.8
>                 cax = plt.axes([l+w+0.025, b, 0.025, h], )
>                 cbar=plt.colorbar(CS, cax=cax, drawedges=True)
>
>             #save map as *.png and plot netcdf file
>
> plt.savefig((os.path.join(newdir,'TSFC'+date_string+'UTC.png')))
>                 plt.close()
>                 gc.collect()
>                 print "garbage collected again"
> print "end of processing"
>
>
>
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From anikom15 at gmail.com  Thu Sep 29 02:21:21 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 28 Sep 2011 23:21:21 -0700
Subject: syntactic sugar for def?
In-Reply-To: <j608vt$hcs$1@dough.gmane.org>
References: <4E8390F1.9060207@stoneleaf.us>
 <j608vt$hcs$1@dough.gmane.org>
Message-ID: <20110929062121.GA10216@Smoke>

On Wed, Sep 28, 2011 at 07:01:11PM -0400, Terry Reedy wrote:
> On 9/28/2011 5:26 PM, Ethan Furman wrote:
> 
> >I don't remember if 'def' is sugar for something besides lambda.
> 
> That is a bit backwards.
>   lambda x: expr(x)
> is syntactic sugar for
>   def <lambda>(x): return expr(x)
>   del <lambda>
> ;-)
> 

lambda is less sugar and more of just a def as an expression.


From anikom15 at gmail.com  Thu Sep 29 02:24:13 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Wed, 28 Sep 2011 23:24:13 -0700
Subject: Suggested coding style
In-Reply-To: <dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
Message-ID: <20110929062413.GB10216@Smoke>

On Wed, Sep 28, 2011 at 07:11:08PM -0700, rantingrick wrote:
> On Sep 28, 6:26?pm, Tim Johnson <t... at akwebsoft.com> wrote:
> > * DevPlayer <devpla... at gmail.com> [110928 04:31]:
> > > On Sep 27, 10:25 pm, alex23 <wuwe... at gmail.com> wrote:
> > > > rantingrick <rantingr... at gmail.com> wrote:
> > > > > Since, like the bible
> > > > > the zen is self contradicting, any argument utilizing the zen can be
> > > > > defeated utilizing the zen.
> >
> > > > And like the Bible, the Zen was created by humans as a joke. If you're
> > > > taking it too seriously, that's your problem.
> >
> > > > > If however you want to learn about the accepted rules for formatting
> > > > > code then you need to read "PEP-8"! PEP 8 is our style guide.
> >
> > > Contradiction is only seen by narrow perspectve.
> >
> > > Calling the Bible a joke is used to hurt people, not enlighten them.
> > > Those words show bitter arrogance, not constructive critism as it
> > > ignores how others feel about that book. What benefit to others is
> > > gained by calling someones belief a joke?
> >
> > ?My wife and I are devout christians, but not fundamentalist. We
> > ?would not take rantingrick too seriously. If _you_ take him
> > ?seriously, you're just giving him 'street cred'.
> 
> DevPlayer was not even talking about what i said, he was replying to a
> statement by Alex23 who said (and i quote) "And like the Bible, the
> Zen was created by humans as a joke". Maybe you should spend the next
> fifteen or so minutes catching up to the conversation...(?_?)...of
> course only *after* you clean that egg from your face

Perhaps you should spend a little less time on the mailing list and a
little more time in church.


From __peter__ at web.de  Thu Sep 29 02:27:00 2011
From: __peter__ at web.de (Peter Otten)
Date: Thu, 29 Sep 2011 08:27 +0200
Subject: change text of a Tkinter Button by clicking it
References: <b32d1d2b-0692-4050-9275-428dae2e2a25@5g2000yqo.googlegroups.com>
Message-ID: <j6132o$sqb$1@dough.gmane.org>

Sean McIlroy wrote:

> hello
> 
> (how) can you change the text of a Tkinter Button by clicking it?
> something like
> 
> def click(index): return lambda: buttons[index].text = 'hello'
> buttons = [Button(root,command=click(index)) for index in
> range(numbuttons)]
> 
> only with an attribute that Buttons actually have. sorry to have to
> ask such a see-spot-run question. thanks if you can help.

See http://infohost.nmt.edu/tcc/help/pubs/tkinter/universal.html

You can set the text of a Button widget with

button["text"] = ...

or

button.configure(text=...)





From ian.g.kelly at gmail.com  Thu Sep 29 02:57:21 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 00:57:21 -0600
Subject: Suggested coding style
In-Reply-To: <20110929062413.GB10216@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<20110929062413.GB10216@Smoke>
Message-ID: <CALwzidkVOVj=HS7mr=OTt1xhDUSNbeR=EnBSN0dwUw074DpO5g@mail.gmail.com>

On Thu, Sep 29, 2011 at 12:24 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> Perhaps you should spend a little less time on the mailing list and a
> little more time in church.

You must not like churchgoers very much if you want to inflict
rantingrick on them...


From ian.g.kelly at gmail.com  Thu Sep 29 03:08:13 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 01:08:13 -0600
Subject: Suggested coding style
In-Reply-To: <CALwzidkVOVj=HS7mr=OTt1xhDUSNbeR=EnBSN0dwUw074DpO5g@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<20110929062413.GB10216@Smoke>
	<CALwzidkVOVj=HS7mr=OTt1xhDUSNbeR=EnBSN0dwUw074DpO5g@mail.gmail.com>
Message-ID: <CALwzidkw2KKxgwavdGRkRahw00536nNYOFqHTFn7SavkWpwHgw@mail.gmail.com>

On Thu, Sep 29, 2011 at 12:57 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Thu, Sep 29, 2011 at 12:24 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
>> Perhaps you should spend a little less time on the mailing list and a
>> little more time in church.
>
> You must not like churchgoers very much if you want to inflict
> rantingrick on them...

Although come to think of it, I bet he could deliver a pretty mean sermon. ;-)


From jitu.icfai at gmail.com  Thu Sep 29 03:41:29 2011
From: jitu.icfai at gmail.com (jitendra gupta)
Date: Thu, 29 Sep 2011 13:11:29 +0530
Subject: A trivial question
In-Reply-To: <1317246561.85326.YahooMailNeo@web120310.mail.ne1.yahoo.com>
References: <1317246561.85326.YahooMailNeo@web120310.mail.ne1.yahoo.com>
Message-ID: <CAM6SjUJNKRRUw078JMek-gQA6oZyEVZo12XrFmwyENQoSpqraw@mail.gmail.com>

HI
The class Foo you have defined is local NameSpace for trial functioon, for
details http://docs.python.org/tutorial/classes.html

def trial():
class Foo(object):
def __init__(self):
print("Hello, world!")
       lacalClass = Foo()
>>>trial
"Hello, world!"

Thanks
Jitendra

On Thu, Sep 29, 2011 at 3:19 AM, Tayfun Kayhan <tayfun92_kayhan at yahoo.com>wrote:

> I accidentally wrote such a code (below) while trying to write sth else for
> my application but i am now just wondering much how to run the class Foo, if
> it is possible. Is not it weird that Python does not give any error when I
> run it ? Sorry for that it's pretty unimportant question according to the
> other questions being asked here :D
>
> def trial():
> class Foo(object):
> def __init__(self):
> print("Hello, world!")
> trial() # not worked, as expected.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
-------------- next part --------------
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From steve+comp.lang.python at pearwood.info  Thu Sep 29 05:21:16 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: 29 Sep 2011 09:21:16 GMT
Subject: Python without a tty
Message-ID: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>

I have a Python script which I would like to test without a tty attached 
to the process. I could run it as a cron job, but is there an easier way?

I am running Linux.



-- 
Steven


From redbullhats123 at gmail.com  Thu Sep 29 05:36:29 2011
From: redbullhats123 at gmail.com (red bull hats red bull hats)
Date: Thu, 29 Sep 2011 02:36:29 -0700 (PDT)
Subject: red bull hats, monster energy hats, red bull t shirts, monster energy
	t shirts, snapback hats on www.theworldhats.com
Message-ID: <e694068b-8a03-4419-86f9-d538fb2b0041@i33g2000yqm.googlegroups.com>

 www.theworldhats.com are promoting

the products:

red bull hats:http://www.theworldhats.com/category-130-b0-Red-Bull-
Hats.html

snapback hats: http://www.theworldhats.com/category-230-b0-Snapback-Hats.html

monster energy hats: http://www.theworldhats.com/category-128-b0-Monster-Energy-Hats.html

red bull t shirts:http://www.theworldhats.com/category-227-b0-Red-Bull-
T-shirts.html

monster energy t shirts:http://www.theworldhats.com/category-203-b0-
Monster-Energy-T-shirts.html

website: www.theworldhats.com


From t at jollybox.de  Thu Sep 29 05:45:40 2011
From: t at jollybox.de (Thomas Jollans)
Date: Thu, 29 Sep 2011 11:45:40 +0200
Subject: Python without a tty
In-Reply-To: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4E843E44.7040008@jollybox.de>

On 29/09/11 11:21, Steven D'Aprano wrote:
> I have a Python script which I would like to test without a tty attached 
> to the process. I could run it as a cron job, but is there an easier way?
> 
> I am running Linux.
> 

./program </dev/null >/dev/null 2>&1



From alain at dpt-info.u-strasbg.fr  Thu Sep 29 05:53:12 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Thu, 29 Sep 2011 11:53:12 +0200
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87bou3wu7r.fsf@dpt-info.u-strasbg.fr>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I have a Python script which I would like to test without a tty attached 
> to the process. I could run it as a cron job, but is there an easier way?
>
> I am running Linux.

Isn't os.setsid() what you're looking for? It makes the calling process
have no controlling terminal. There's also a user command called setsid
that should have the same effect.

-- Alain.


From passiday at gmail.com  Thu Sep 29 06:37:39 2011
From: passiday at gmail.com (Passiday)
Date: Thu, 29 Sep 2011 03:37:39 -0700 (PDT)
Subject: Suggested coding style
In-Reply-To: <265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
Message-ID: <16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>

Oh, my. Who could expect this topic would iterate to some whining about religion (please don't respond on this remark of mine).

Here's a summary of what I take from this longwinded thread:
Read the Zen of Pthon for some fun: http://www.python.org/dev/peps/pep-0020
Read the PEP-8 for some good guidelines: http://www.python.org/dev/peps/pep-0008

My topic was "Suggested coding style" because I hoped there is some common understanding which of the ancient methods/functions are so not where they should be that the use of them should be depreciated. I can fully understand that when the language evolves, it might implement some ugly methods. Perhaps it was some quick itching need to format some numbers that drove some antique Python programmer so mad that he decided this belongs to the string class, instead of some number/date/string formatting class that attempts to build on existing well established standards. And so, the str.zfill() was born. But I'd expect that there exists some leadership who are brave enough to admit some bad decisions and lead the people by announcing that using certain methods is "bad style". No need to take them out of the implementation, that might unnecessary break some code in obscure places. However, guiding programmers for better coding practice and avoid ugly bloating of nice scripting language should be considered a holy (please don't rant on use of this word) mission.

Passiday


From steve+comp.lang.python at pearwood.info  Thu Sep 29 06:37:53 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 20:37:53 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<mailman.1558.1317277459.27778.python-list@python.org>
Message-ID: <4e844a83$0$29982$c3e8da3$5496439d@news.astraweb.com>

Westley Mart?nez wrote:

> Perhaps you should spend a little less time on the mailing list and a
> little more time in church.

Is that meant as punishment for Rick or for the churchgoers?


-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep 29 06:52:22 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Thu, 29 Sep 2011 20:52:22 +1000
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
Message-ID: <4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>

Alain Ketterlin wrote:

> Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:
> 
>> I have a Python script which I would like to test without a tty attached
>> to the process. I could run it as a cron job, but is there an easier way?
>>
>> I am running Linux.
> 
> Isn't os.setsid() what you're looking for? It makes the calling process
> have no controlling terminal. There's also a user command called setsid
> that should have the same effect.

It doesn't appear so to me.

[steve at sylar ~]$ tty
/dev/pts/16
[steve at sylar ~]$ setsid tty
/dev/pts/16

[steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
True
[steve at sylar ~]$ setsid python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
True


If I run the same Python command (without the setsid) as a cron job, I 
get False emailed to me. That's the effect I'm looking for.



-- 
Steven



From hansmu at xs4all.nl  Thu Sep 29 07:39:25 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Thu, 29 Sep 2011 13:39:25 +0200
Subject: Python without a tty
In-Reply-To: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e8458ed$0$2486$e4fe514c@news2.news.xs4all.nl>

On 29/09/11 11:21:16, Steven D'Aprano wrote:
> I have a Python script which I would like to test without a tty attached
> to the process. I could run it as a cron job, but is there an easier way?

There is module on Pypi called python-daemon; it implements PEP-3143.
This module detaches the process from the tty and resets a number of
process attributes that are normally inherited.

You could start by reading the PEP to determine which of its features
are relevant to your situation.  It would provide you with a complete
list of aspects you'd need to think about.

If a third of what the module does is relevant to your situation and
the other two thirds do not hurt, then using the module is likely to
be less work than rolling your own.

Hope this helps,

-- HansM


From alain at dpt-info.u-strasbg.fr  Thu Sep 29 07:50:18 2011
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Thu, 29 Sep 2011 13:50:18 +0200
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <877h4rwosl.fsf@dpt-info.u-strasbg.fr>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> Alain Ketterlin wrote:

>>> I have a Python script which I would like to test without a tty attached
>>> to the process. I could run it as a cron job, but is there an easier way?

>> Isn't os.setsid() what you're looking for?[...]

> It doesn't appear so to me.
[...]
> [steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
> [steve at sylar ~]$ setsid python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
>
> If I run the same Python command (without the setsid) as a cron job, I 
> get False emailed to me. That's the effect I'm looking for.

If that's what you mean by "without a tty attached", simply redirecting
standard channels should work, no?

-- Alain.


From hansmu at xs4all.nl  Thu Sep 29 07:50:29 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Thu, 29 Sep 2011 13:50:29 +0200
Subject: Python without a tty
In-Reply-To: <4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <4e845b85$0$2486$e4fe514c@news2.news.xs4all.nl>

On 29/09/11 12:52:22, Steven D'Aprano wrote:

> [steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
 >
> If I run the same Python command (without the setsid) as a cron job, I
> get False emailed to me. That's the effect I'm looking for.

In that case, all you need to do is redirect stdout:

$ python -c "import sys, os
 > print os.isatty(sys.stdout.fileno())" >/tmp/xxx
$ cat /tmp/xxx
False

You'll probably want to redirect to /dev/null and
maybe you want to redirect stdin and stderr as well.

-- HansM


From rantingrick at gmail.com  Thu Sep 29 08:23:30 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 05:23:30 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
Message-ID: <fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>

On Sep 29, 5:37?am, Passiday <passi... at gmail.com> wrote:

> Here's a summary of what I take from this longwinded thread:
> Read the Zen of Pthon for some fun:http://www.python.org/dev/peps/pep-0020
> Read the PEP-8 for some good guidelines:http://www.python.org/dev/peps/pep-0008

That's the point of all this, yes. You see, around here, once the
point is made there is an unwritten rule that the thread must then
descend into chaos. However, it seems you "may" have brought this
train wreck back to reality below... whether the trolls will allow
that happen remains to be seen...?

> My topic was "Suggested coding style" because I hoped
> there is some common understanding which of the ancient
> methods/functions are so not where they should be that the
> use of them should be depreciated.

I agree. Whilst zfill is useful, and probably should be a part of the
stlib somewhere, the string module is no place for it. The only way
zfill WOULD work as a string method is if it were changed to accept a
user defined fill char. Even then i don't like it as a string method;
too specific!

A specific method for padding a string with ONLY zeros is ludicrous
and exposes the narrow mindedness of the creator. The only thing worse
than "zfill" as a string method is making zfill into built-in
function! The ONLY proper place for zfill is as an option in the
str.format() method.

py> "{0:zf10}".format(1234) -> "00000000001234"

When are they going to see that I am the best API designer this
community has ever had the privilege to work with! GvR should be
texting me every night in hopes that some of my API genius will rub
off on him.

> I can fully understand
> that when the language evolves, it might implement some
> ugly methods. Perhaps it was some quick itching need to
> format some numbers that drove some antique Python
> programmer so mad that he decided this belongs to the
> string class, instead of some number/date/string
> formatting class that attempts to build on existing well
> established standards. And so, the str.zfill() was born.

zfills foster home placement is akin to the missing Path object we
still don't have. Both are a result of poor planning. Now zfill is
like some red headed step child that nobody wants, but nobody has the
balls to return the abortion to it's rightful place.

> But I'd expect that there exists some leadership who are
> brave enough to admit some bad decisions and lead the
> people by announcing that using certain methods is "bad
> style".

Ha! I would not hold my breath waiting for "leadership" to admit wrong
doings; these people think they are beyond reproach.

> No need to take them out of the implementation,
> that might unnecessary break some code in obscure places.

What is so bad about breaking code in obscure places? We changed print
to a function which broke just about every piece of code every written
in this language. (BTW, print should ALWAYS have been a function!)
What is so bad then about breaking some very obscure code? We could
always have a lengthy deprecation period.

> However, guiding programmers for better coding practice
> and avoid ugly bloating of nice scripting language should
> be considered a holy (please don't rant on use of this
> word) mission.

I agree. I think you'll agree also with me in the fact that Mr Van
Rossum has created the cleanest, most simplistically elegant, and no
nonsense language this world has ever seen. However. He is not immune
to the wicked influence of a few high ranking people within this
community who have "hidden agendas" and want to mutate Python into a
clone of some other nasty languages.

I believe GvR had a "mid-dev-crisis" and realized the err of his ways.
He attempted to turn back the clock with Python 3000, HOWEVER he did
not go far enough! Much more cleanup is in order to get this language
back on track to what it should be, and COULD be!


From ben+python at benfinney.id.au  Thu Sep 29 08:32:37 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 29 Sep 2011 22:32:37 +1000
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <87vcsb34wq.fsf@benfinney.id.au>

Steven D'Aprano <steve+comp.lang.python at pearwood.info> writes:

> I have a Python script which I would like to test without a tty
> attached to the process. I could run it as a cron job, but is there an
> easier way?
>
> I am running Linux.

You could crib from the ?python-daemon? library implementation
<URL:http://pypi.python.org/pypi/python-daemon>. Part of its job
involves detaching the current program from the terminal.

Or maybe you could simply invoke the library for its main purpose, if
that would be sufficient to do what you need.

-- 
 \        ?Sane people have an appropriate perspective on the relative |
  `\     importance of foodstuffs and human beings. Crazy people can't |
_o__)                 tell the difference.? ?Paul Z. Myers, 2010-04-18 |
Ben Finney


From rantingrick at gmail.com  Thu Sep 29 09:21:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 06:21:36 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <1c731ba2-7104-44bb-a5d4-5798ce56bfc8@z12g2000yqz.googlegroups.com>

On Sep 29, 7:23?am, rantingrick <rantingr... at gmail.com> wrote:

> A specific method for padding a string with ONLY zeros is ludicrous
> and exposes the narrow mindedness of the creator. The only thing worse
> than "zfill" as a string method is making zfill into built-in
> function! The ONLY proper place for zfill is as an option in the
> str.format() method.
>
> py> "{0:zf10}".format(1234) -> "00000000001234"


If something like "zfill" where to be included as a string method, it
should be more general like this:

class String:
    def pad(self, char, count, side='left') => str

py> "".pad(0, 10)
'00000000001234'

However the same can be accomplished with:

py> '{0}1234'.format("0"*10)
'00000000001234'

py> "0"*10+'1234'
'00000000001234'

Seems like pollution either way you go. Best to just let the
programmer handle it. Python IS NOT a 100% OOP language (and for good
reason!) so we don't need methods to scratch every little itch -- and
this itch seems to have originated in the "nether regions" instead of
the "Netherlands".




From roy at panix.com  Thu Sep 29 09:28:35 2011
From: roy at panix.com (Roy Smith)
Date: Thu, 29 Sep 2011 09:28:35 -0400
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <roy-48F208.09283529092011@news.panix.com>

In article <4e84388c$0$29965$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> I have a Python script which I would like to test without a tty attached 
> to the process. I could run it as a cron job, but is there an easier way?

I'm not sure what you mean by "without a tty attached to the process".  
If you mean no file descriptors attached to your control terminal, then 
some variation on

foo.py < /dev/null > /dev/null

(as others has suggested) might be good enough.  Or, are you talking 
about control terminals in the process control sense?  In that case, you 
might want to look at the "at" or "batch" commands, which do very much 
the same thing as cron, but without the overhead of having to edit the 
cron file to get things going.


From python at mrabarnett.plus.com  Thu Sep 29 10:02:55 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 29 Sep 2011 15:02:55 +0100
Subject: [OT] Benefit and belief
In-Reply-To: <87zkho2glb.fsf@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
Message-ID: <4E847A8F.3070401@mrabarnett.plus.com>

On 29/09/2011 04:05, Ben Finney wrote:
> Devin Jeanpierre<jeanpierreda at gmail.com>  writes:
>
>>> Forget money, or even the love of money. The idea that one mustn't
>>> criticise another person's beliefs is the root of all evil.
>>
>> This was a technical discussion, and calling the bible a joke was not
>> necessary at all. It creates a hostile atmosphere.
>
> I disagree. It was not an attack on any person nor group of people. If
> we are to be required to avoid jokes not directed at people, then *that*
> is an atmosphere hostile to open friendly discussion.
>
>> Can't you pick somewhere else to attack Christianity?
>
> The person who wrote the ?bible is a joke? intended it as a flippant
> remark. Countless other flippant remarks pass through here all the time,
> making jokes at the expense of some idea or other. Christianity will not
> be an exception to that.
>
> If you find someone attacking people, I'll join you in ostracising the
> attacker. But no, don't attempt to silence jokes that attack an idea.
>
> Off-topic? If we start discussing the content of the ideas being
> attacked, yeah, I'd say religion is pretty off-topic.
>
> But the topic of keeping this forum safe for technical discussion
> entails that it must be safe for *any* idea to be the butt of a joke, be
> it a religious text or the Zen of Python, and that is very much
> on-topic.
>
Even if it offends Python worshippers?
http://www.youtube.com/watch?v=asUyK6JWt9U


From martin.hellwig at gmail.com  Thu Sep 29 10:25:40 2011
From: martin.hellwig at gmail.com (Martin P. Hellwig)
Date: Thu, 29 Sep 2011 15:25:40 +0100
Subject: Python without a tty
In-Reply-To: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <j61v4o$52e$1@dont-email.me>

On 29/09/2011 10:21, Steven D'Aprano wrote:
> I have a Python script which I would like to test without a tty attached
> to the process. I could run it as a cron job, but is there an easier way?
>
> I am running Linux.
>
>
>
Well you could double fork and drop the parent, that would lose the tty
which is the same effect what you get when you want a daemon.

-- 
mph


From brandtrade08 at 126.com  Thu Sep 29 10:26:15 2011
From: brandtrade08 at 126.com (jerser-2009)
Date: Thu, 29 Sep 2011 07:26:15 -0700 (PDT)
Subject: Nike Air Max LeBron VIII
Message-ID: <81a0b983-ea36-45ff-b482-450d07eed5ed@g23g2000vbz.googlegroups.com>

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From brian.curtin at gmail.com  Thu Sep 29 10:27:43 2011
From: brian.curtin at gmail.com (Brian Curtin)
Date: Thu, 29 Sep 2011 09:27:43 -0500
Subject: Installing Python 2.6.7 on Windows
In-Reply-To: <pan.2011.09.29.00.10.37.975000@nowhere.com>
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1543.1317248503.27778.python-list@python.org>
	<pan.2011.09.29.00.10.37.975000@nowhere.com>
Message-ID: <CAD+XWwok627Do=JcE+JSBDUJT8A0p6+dSa6tzEiM+FcQo08SDA@mail.gmail.com>

On Wed, Sep 28, 2011 at 19:10, Nobody <nobody at nowhere.com> wrote:

> On Wed, 28 Sep 2011 15:21:25 -0700, Ned Deily wrote:
>
> > No, it was a deliberate decision.  After a release is in security-fix
> > mode only, we don't build Windows or Mac OS X installers for them.
>
> But you continue to offer the installers for the unfixed version.


No one would use Python if we literally forced everyone to upgrade based on
our schedule by removing any trace of previous installers.

Also, "unfixed" is relative. You're only vulnerable if you're using urllib
to request resources which may end up being 302 redirected. I personally
don't need that fix, so 2.6.6 would be alright with me.
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From bcloete at gmail.com  Thu Sep 29 10:45:53 2011
From: bcloete at gmail.com (Bradley Cloete)
Date: Thu, 29 Sep 2011 16:45:53 +0200
Subject: Python without a tty
In-Reply-To: <4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CACGgnMCPVqTXOvj2rXWDLn1pOwYa=63wqaVAxo7tW+LASaMe3A@mail.gmail.com>

> It doesn't appear so to me.
>
> [steve at sylar ~]$ tty
> /dev/pts/16
> [steve at sylar ~]$ setsid tty
> /dev/pts/16
>
> [steve at sylar ~]$ python -c "import sys,os; print
> os.isatty(sys.stdout.fileno())"
> True
> [steve at sylar ~]$ setsid python -c "import sys,os; print
> os.isatty(sys.stdout.fileno())"
> True
>
>
> If I run the same Python command (without the setsid) as a cron job, I
> get False emailed to me. That's the effect I'm looking for.
>
>
Maybe nohup is what you looking for?

>From the info pages...

"`nohup' runs the given COMMAND with hangup signals ignored, so that the
command can continue running in the background after you log out.
Synopsis:

     nohup COMMAND [ARG]...

   If standard output is a terminal, it is redirected so that it is
appended to the file `nohup.out'; if that cannot be written to, it is
appended to the file `$HOME/nohup.out'.  If that cannot be written to,
the command is not run.  If standard output is not a terminal, then the
standard output of COMMAND will be the same as that of `nohup'.

"

Regards
Bradley
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From subhagurgaon2011 at gmail.com  Thu Sep 29 12:11:41 2011
From: subhagurgaon2011 at gmail.com (Subhabrata Banerjee)
Date: Thu, 29 Sep 2011 09:11:41 -0700 (PDT)
Subject: Question on Manipulating List and on Python
Message-ID: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>

Dear Group,

I have two questions one on list manipulation and other on Python.

(i) I have a file of lists. Now, the first digit starts with a number
or index, like,

[001, "Obama", "USA", "President"]
[002  "Major", "UK", "PM"]
[003  "Singh", "INDIA", "PM"]

Initially, I am reading the file and taking as
for line in file:
    line_word=line.split
    print line_word

I am getting the above result. But, my problem is if I read the array
position 0, which is a number then it should give me reciprocal words
like
if
word1=line_word[0]
if word1==001:
    I should get line_word[1], line_word[2] reciprocating the value.

Predefining it solves the problem, but I want to capture and do as it
iterates. If any one can help?

(ii) My second question is posted by one of my colleagues, what makes
Python so fast?

Regards,
Subhabrata Banerjee.


From gordon at panix.com  Thu Sep 29 12:27:49 2011
From: gordon at panix.com (John Gordon)
Date: Thu, 29 Sep 2011 16:27:49 +0000 (UTC)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
Message-ID: <j626a5$5he$1@reader1.panix.com>

In <a6679459-fc57-4389-8d43-1e5ed960d85d at y18g2000yqy.googlegroups.com> Subhabrata Banerjee <subhagurgaon2011 at gmail.com> writes:

> (i) I have a file of lists. Now, the first digit starts with a number
> or index, like,

> [001, "Obama", "USA", "President"]
> [002  "Major", "UK", "PM"]
> [003  "Singh", "INDIA", "PM"]

> Initially, I am reading the file and taking as
> for line in file:
>     line_word=line.split
>     print line_word

This isn't your actual code.  Please show us your real code, along with
a sample of your input file.

> (ii) My second question is posted by one of my colleagues, what makes
> Python so fast?

Fast compared to what?  Why does your colleague believe it should be
slower?

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From dwblas at gmail.com  Thu Sep 29 12:34:00 2011
From: dwblas at gmail.com (David)
Date: Thu, 29 Sep 2011 09:34:00 -0700 (PDT)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
Message-ID: <12c2b6e4-5fa4-44ed-83f4-2a969ae4076b@8g2000yqm.googlegroups.com>

> word1=line_word[0]
> if word1==001:


You are comparing a string and an integer assuming you are reading a
text file.

integers
word1=int(line_word[0])
if word1=1:

strings
word1=line_word[0]
if word1=="001:"



From anikom15 at gmail.com  Thu Sep 29 12:34:25 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 09:34:25 -0700
Subject: Suggested coding style
In-Reply-To: <4e844a83$0$29982$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<mailman.1547.1317252421.27778.python-list@python.org>
	<dff278e9-3b7c-4b2e-8eec-1b25591a5bab@i23g2000yqm.googlegroups.com>
	<mailman.1558.1317277459.27778.python-list@python.org>
	<4e844a83$0$29982$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <20110929163425.GA10980@Smoke>

On Thu, Sep 29, 2011 at 08:37:53PM +1000, Steven D'Aprano wrote:
> Westley Mart?nez wrote:
> 
> > Perhaps you should spend a little less time on the mailing list and a
> > little more time in church.
> 
> Is that meant as punishment for Rick or for the churchgoers?
> 
> 

Hopefully neither, probably both.


From subhagurgaon2011 at gmail.com  Thu Sep 29 12:36:29 2011
From: subhagurgaon2011 at gmail.com (Subhabrata Banerjee)
Date: Thu, 29 Sep 2011 09:36:29 -0700 (PDT)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
Message-ID: <71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>

On Sep 29, 9:27?pm, John Gordon <gor... at panix.com> wrote:
> In <a6679459-fc57-4389-8d43-1e5ed960d... at y18g2000yqy.googlegroups.com> Subhabrata Banerjee <subhagurgaon2... at gmail.com> writes:
>
> > (i) I have a file of lists. Now, the first digit starts with a number
> > or index, like,
> > [001, "Obama", "USA", "President"]
> > [002 ?"Major", "UK", "PM"]
> > [003 ?"Singh", "INDIA", "PM"]
> > Initially, I am reading the file and taking as
> > for line in file:
> > ? ? line_word=line.split
> > ? ? print line_word
>
> This isn't your actual code. ?Please show us your real code, along with
> a sample of your input file.
>
> > (ii) My second question is posted by one of my colleagues, what makes
> > Python so fast?
>
> Fast compared to what? ?Why does your colleague believe it should be
> slower?
>
> --
> John Gordon ? ? ? ? ? ? ? ? ? A is for Amy, who fell down the stairs
> gor... at panix.com ? ? ? ? ? ? ?B is for Basil, assaulted by bears
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? -- Edward Gorey, "The Gashlycrumb Tinies"

Hi John,
The actual code is till now is:

def name_debugger(n):
    open_file=open("/python27/name1.txt")
    for line in open_file:
        line_word=line.split()
        #print line_word
        word1=line_word[0]
        print word1


And Python seems faster than C++/Java. It is indeed. I also experience
it.

Regards,
Subhabrata Banerjee.


From clp2 at rebertia.com  Thu Sep 29 12:37:28 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 29 Sep 2011 09:37:28 -0700
Subject: Question on Manipulating List and on Python
In-Reply-To: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
Message-ID: <CAMZYqRTY09hsLjQ4A0Cu_cZ7uMH-hofRz9dve=Hyvw+htrLqBg@mail.gmail.com>

On Thu, Sep 29, 2011 at 9:11 AM, Subhabrata Banerjee
<subhagurgaon2011 at gmail.com> wrote:
> Dear Group,
>
> I have two questions one on list manipulation and other on Python.
>
> (i) I have a file of lists. Now, the first digit starts with a number
> or index, like,
>
> [001, "Obama", "USA", "President"]
> [002 ?"Major", "UK", "PM"]
> [003 ?"Singh", "INDIA", "PM"]
>
> Initially, I am reading the file and taking as
> for line in file:
> ? ?line_word=line.split
> ? ?print line_word
>
> I am getting the above result. But, my problem is if I read the array
> position 0, which is a number then it should give me reciprocal words
> like
> if
> word1=line_word[0]
> if word1==001:
> ? ?I should get line_word[1], line_word[2] reciprocating the value.
>
> Predefining it solves the problem, but I want to capture and do as it
> iterates. If any one can help?

I'm not really clear what you mean by "reciprocal", so this is just a
guess: Perhaps you want list slicing?

>>> line_word = ["001", "Obama", "USA", "President"]
>>> print(line_word[1:])
['Obama', 'USA', 'President']
>>>

Details: http://stackoverflow.com/questions/509211/good-primer-for-python-slice-notation

> (ii) My second question is posted by one of my colleagues, what makes
> Python so fast?

CPython is actually relatively slow compared to the primary
implementations of other languages since Python highly dynamic, and
interpreted rather than compiled to machine code (normally). There are
currently some promising efforts (like PyPy) to produce a faster
implementation however.

Cheers,
Chris
--
http://rebertia.com


From moky.math at gmail.com  Thu Sep 29 12:39:51 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Thu, 29 Sep 2011 18:39:51 +0200
Subject: Question on Manipulating List and on Python
In-Reply-To: <j626a5$5he$1@reader1.panix.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
Message-ID: <4E849F57.4010101@gmail.com>

Le 29/09/2011 18:27, John Gordon a ?crit :
> In<a6679459-fc57-4389-8d43-1e5ed960d85d at y18g2000yqy.googlegroups.com>  Subhabrata Banerjee<subhagurgaon2011 at gmail.com>  writes:
>
>>  (i) I have a file of lists. Now, the first digit starts with a number
>>  or index, like,
>
>>  [001, "Obama", "USA", "President"]
>>  [002  "Major", "UK", "PM"]
>>  [003  "Singh", "INDIA", "PM"]

What about creating a dictionary ?

dic = {1:["Obama","USA","President"],2:[etc.]]


>>  (ii) My second question is posted by one of my colleagues, what makes
>>  Python so fast?

If your colleague is used to program inside Word macros, I guess the 
answer ;) If he is used to program in C, I'm less sure.
It really depends on the context of the question.

Laurent


From anikom15 at gmail.com  Thu Sep 29 12:42:11 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 09:42:11 -0700
Subject: Suggested coding style
In-Reply-To: <fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <20110929164211.GA11016@Smoke>

On Thu, Sep 29, 2011 at 05:23:30AM -0700, rantingrick wrote:
> On Sep 29, 5:37?am, Passiday <passi... at gmail.com> wrote:
>  
> What is so bad about breaking code in obscure places? We changed print
> to a function which broke just about every piece of code every written
> in this language. (BTW, print should ALWAYS have been a function!)
> What is so bad then about breaking some very obscure code? We could
> always have a lengthy deprecation period.
> 

Well, I once thought that a print function made a lot of sense.  In C,
printf is a function, however then I think why print is a function.  In
C, just about every function has side effects (the return values are
more often than not either pointers or status codes).  In Python
functions are encouraged to not have side-effects, so the implementation
of print as a statement or a method makes far more sense than as a
function.

But maybe I'm just batty as you all think I am.


From rosuav at gmail.com  Thu Sep 29 12:50:49 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 02:50:49 +1000
Subject: Question on Manipulating List and on Python
In-Reply-To: <71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
Message-ID: <CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>

On Fri, Sep 30, 2011 at 2:36 AM, Subhabrata Banerjee
<subhagurgaon2011 at gmail.com> wrote:
> And Python seems faster than C++/Java. It is indeed. I also experience
> it.
>

Python compared to Java? Difficult to compare. Python to C++?
Impossible to compare. But performance depends MASSIVELY on
algorithmic quality; if you code the exact same thing in Python and in
C++, you would probably find that the C++ one is faster, but chances
are you're implementing approximately the same thing in two quite
different ways. Or possibly you're using a slow and inefficient
library or third-party function.

I've sometimes written code in one language and directly ported it to
another, and then run both on the same hardware. With most such
experiments, CPython generally doesn't perform all that well, and C or
C++ rocks. But frequently, the C/C++ code is more verbose and more
error-prone than the Python - because Python's biggest boast is not
that it's fast, but that it's *fast enough*, while being easy to work
with. (And every once in a while there's something where I want to use
a pointer to some other variable, and that's a concept that just plain
doesn't work in Python. You have references to objects, but you can't
from one place change another variable, without using some kind of
mutable object that they both reference.)

ChrisA


From miki.tebeka at gmail.com  Thu Sep 29 12:52:07 2011
From: miki.tebeka at gmail.com (Miki Tebeka)
Date: Thu, 29 Sep 2011 09:52:07 -0700 (PDT)
Subject: options for plotting points on geographic map
In-Reply-To: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
References: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
Message-ID: <28071425.854.1317315127547.JavaMail.geo-discussion-forums@prfb12>

Probably the google maps routes will be faster (maybe using embedded webkit window). However it requires internet connection.

See also http://www.scipy.org/Cookbook/Matplotlib/Maps

HTH
--
Miki Tebeka <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From gordon at panix.com  Thu Sep 29 12:52:53 2011
From: gordon at panix.com (John Gordon)
Date: Thu, 29 Sep 2011 16:52:53 +0000 (UTC)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
Message-ID: <j627p5$bsd$1@reader1.panix.com>

In <71c71a9d-928d-4ebe-af64-674c31bc1c09 at e9g2000vby.googlegroups.com> Subhabrata Banerjee <subhagurgaon2011 at gmail.com> writes:

> Hi John,
> The actual code is till now is:

> def name_debugger(n):
>     open_file=3Dopen("/python27/name1.txt")
>     for line in open_file:
>         line_word=3Dline.split()
>         #print line_word
>         word1=3Dline_word[0]
>         print word1

Can you give us some sample lines from /python27/name1.txt ?

> And Python seems faster than C++/Java. It is indeed. I also experience
> it.

It shouldn't be inherently faster than C++ or Java.  If it is, it's
because the C++ or Java code is doing more work.

Do you have a sample Python program and a sample C++ or Java program
to demonstrate the speed difference?

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"



From rosuav at gmail.com  Thu Sep 29 13:02:29 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 03:02:29 +1000
Subject: Suggested coding style
In-Reply-To: <20110929164211.GA11016@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<20110929164211.GA11016@Smoke>
Message-ID: <CAPTjJmqYNG8DCxRH0RiLVGa0bkXpPjbHE1bqc8dRXFHggBwWgw@mail.gmail.com>

On Fri, Sep 30, 2011 at 2:42 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> But maybe I'm just batty as you all think I am.

Yes, I'm afraid so. Bonkers. Off your head. But let me tell you a
secret... All the best people are.

> Well, I once thought that a print function made a lot of sense. ?In C,
> printf is a function, however then I think why print is a function. ?In
> C, just about every function has side effects (the return values are
> more often than not either pointers or status codes). ?In Python
> functions are encouraged to not have side-effects, so the implementation
> of print as a statement or a method makes far more sense than as a
> function.

Since functions and methods in Python are practically the same thing,
I don't know that there really need be any difference in policy. But I
do like any reduction in the number of "special features" of a
language. If screen output can be done as an ordinary function taking
ordinary arguments, that's better than having a special language
construct. Also, it's just plain stupid and yet just plain cool to be
able to:

print = sys.stderr.write

and smoothly redirect all your prints to stderr. (Unfortunately this
doesn't quite work, as it means you don't get your newlines put in for
you, but there's sure to be an equally stupid/cool reassignment
available.)

ChrisA


From moky.math at gmail.com  Thu Sep 29 13:08:52 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Thu, 29 Sep 2011 19:08:52 +0200
Subject: Counting the number of call of a function
Message-ID: <j628n2$vmq$1@news.univ-fcomte.fr>

    Hello


    Is it possible to count the number of time a function is called ?
Of course, if I've access to the source code, it's easy.

I tried the following :

def foo():
     print "foo !"


class wraper(object):
     def __init__(self,fun):
         globals()[fun]=self.replacement
     def replacement(*args):
         print "I'm replaced"

foo()
X=wraper(foo)
foo()

I was hoping that globals()[foo] would be replaced by my X.replacement 
and thus the second call to foo() was expected to print "I'm replaced".

Instead nothing is done.

By the way, I tried to print globals() inside __init__() to see what 
happens. It turns out that the entry 'foo' is never modified.

Any idea ?
I fact what I have to do is to add a decorator _a posteriori_ ...

Have a good night
Laurent





From rosuav at gmail.com  Thu Sep 29 13:20:30 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 03:20:30 +1000
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <CAPTjJmqP+rHVQ3MOjWGYPup2srrNRkQg49PzuoWmeGc6BFt5Yg@mail.gmail.com>

On Fri, Sep 30, 2011 at 3:08 AM, Laurent Claessens <moky.math at gmail.com> wrote:
> def foo():
> ? ?print "foo !"
>
>
> class wraper(object):
> ? ?def __init__(self,fun):
> ? ? ? ?globals()[fun]=self.replacement
> ? ?def replacement(*args):
> ? ? ? ?print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()

Are you able to change the call structure to:

foo() # unchanged
foo=wrapper(foo) # this changes it
foo() # should now be changed

perhaps? That would be a lot easier to manage. Then you could write
the wrapper thus:

class wrapper(object):
    def __init__(self,func):
        self.func=func
    def __call__(self,*args,**kwargs):
        print("I'm replaced!")  # if you want to be noisy
        self.count+=1
        self.func(*args,**kwargs)

Tested in Python 3; should also work in Python 2, which you appear to
be using. Effectively, I've written something that could actually be a
decorator, and then done the same sort of thing that a decorator does
by rebinding the name.

ChrisA


From rosuav at gmail.com  Thu Sep 29 13:22:12 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 03:22:12 +1000
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <CAPTjJmo9AZc4HFMHk+Oc7q6i7ydtmB+-rxxUDfiN=w75yR67Vg@mail.gmail.com>

On Fri, Sep 30, 2011 at 3:08 AM, Laurent Claessens <moky.math at gmail.com> wrote:
> class wraper(object):
> ? ?def __init__(self,fun):
> ? ? ? ?globals()[fun]=self.replacement
> ? ?def replacement(*args):
> ? ? ? ?print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()
>
> I was hoping that globals()[foo] would be replaced by my X.replacement and
> thus the second call to foo() was expected to print "I'm replaced".

Actually, I've just realized what your problem might be. Try:
X = wraper("foo")

You're indexing globals() with the actual function object, but you
want to index it with the function _name_. I do think that the
decorator technique will be a lot cleaner, though.

ChrisA


From python at mrabarnett.plus.com  Thu Sep 29 13:26:18 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 29 Sep 2011 18:26:18 +0100
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <4E84AA3A.7040209@mrabarnett.plus.com>

On 29/09/2011 18:08, Laurent Claessens wrote:
> Hello
>
>
> Is it possible to count the number of time a function is called ?
> Of course, if I've access to the source code, it's easy.
>
> I tried the following :
>
> def foo():
> print "foo !"
>
>
> class wraper(object):
> def __init__(self,fun):
> globals()[fun]=self.replacement
> def replacement(*args):
> print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()
>
> I was hoping that globals()[foo] would be replaced by my X.replacement
> and thus the second call to foo() was expected to print "I'm replaced".
>
> Instead nothing is done.
>
> By the way, I tried to print globals() inside __init__() to see what
> happens. It turns out that the entry 'foo' is never modified.
>
> Any idea ?
> I fact what I have to do is to add a decorator _a posteriori_ ...
>
The keys of globals() are the _names_. You're giving it the function
itself.

Try this:

class wraper(object):
     def __init__(self,fun):
         globals()[fun.__name__]=self.replacement
     def replacement(*args):
         print("I'm replaced")

A decorator would be better.


From clp2 at rebertia.com  Thu Sep 29 13:27:35 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 29 Sep 2011 10:27:35 -0700
Subject: Counting the number of call of a function
In-Reply-To: <j628n2$vmq$1@news.univ-fcomte.fr>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
Message-ID: <CAMZYqRS2NGqpJoXakXF98pfpCMiprOp9HmvusakvATeLuc11XQ@mail.gmail.com>

On Thu, Sep 29, 2011 at 10:08 AM, Laurent Claessens <moky.math at gmail.com> wrote:
> ? Hello
>
>
> ? Is it possible to count the number of time a function is called ?
> Of course, if I've access to the source code, it's easy.
>
> I tried the following :
>
> def foo():
> ? ?print "foo !"
>
>
> class wraper(object):
> ? ?def __init__(self,fun):
> ? ? ? ?globals()[fun]=self.replacement
> ? ?def replacement(*args):
> ? ? ? ?print "I'm replaced"
>
> foo()
> X=wraper(foo)
> foo()
>
> I was hoping that globals()[foo] would be replaced by my X.replacement and
> thus the second call to foo() was expected to print "I'm replaced".
>
> Instead nothing is done.

That's because globals() maps names (i.e. strings) to values, whereas
in this case `fun` is a function object, not a string. Trying to
subscript globals() with a non-string arguably ought to be an error.

By way of example (with irrelevant stuff elided):

Python 2.6.6 (r266:84292, Jan 12 2011, 13:35:00)
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo():
...     pass
...
>>> globals()
{..., 'foo': <function foo at 0x378170>}
>>> globals()[foo] = 42
>>> globals()
{..., <function foo at 0x378170>: 42, 'foo': <function foo at 0x378170>}
>>> globals()["foo"] = 99
>>> globals()
{..., 'foo': 99, <function foo at 0x378170>: 42}

Note that you can get the name of a function using its __name__
attribute. That is to say:
foo.__name__ == "foo"

> By the way, I tried to print globals() inside __init__() to see what
> happens. It turns out that the entry 'foo' is never modified.
>
> Any idea ?
> I fact what I have to do is to add a decorator _a posteriori_ ...

Recall that the decorator syntax:

@bar
def qux():
    pass

is basically equivalent to:

def qux():
    pass

qux = bar(qux)

Therefore, you want something like:

def wrapped(func):
    def replacement(*args, **kwargs):
        print "I'm replaced"
    return replacement

foo = wrapped(foo)
foo() # => I'm replaced

Cheers,
Chris
--
http://rebertia.com


From jeanpierreda at gmail.com  Thu Sep 29 14:49:05 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Thu, 29 Sep 2011 14:49:05 -0400
Subject: [OT] Benefit and belief
In-Reply-To: <87zkho2glb.fsf@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
Message-ID: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>

>> This was a technical discussion, and calling the bible a joke was not
>> necessary at all. It creates a hostile atmosphere.
>
> I disagree. It was not an attack on any person nor group of people. If
> we are to be required to avoid jokes not directed at people, then *that*
> is an atmosphere hostile to open friendly discussion.

Well. It wasn't directly an attack on people exactly. It did mention
believers directly. It could certainly be _interpreted_ as an attack
(and was interpreted that way), and that's really all that's necessary
for a hostile environment.

I'm not saying we should censor ourselves exactly. I've always been
opposed to harsh _rules_ about what's appropriate and what
isn't. But I do think it's important to consider others' feelings.
Just because it isn't an attack, doesn't mean it can't hurt peoples'
feelings, and I think hurting peoples' feelings is something worth
going out of your way to avoid.

Anyway, if it was a joke before, it isn't when somebody starts calling
some "group of people" "organised conspiracies to support and protect
child molesters".

> The person who wrote the ?bible is a joke? intended it as a flippant
> remark. Countless other flippant remarks pass through here all the time,
> making jokes at the expense of some idea or other. Christianity will not
> be an exception to that.

That doesn't make it right. Is it OK to make fun of arbitrary ideas as
"jokes"? I don't think so. It seems, again, hurtful. Especially when
the idea is totally unrelated. It's like we're having a discussion
about dynamic typing and somebody blurts out "Hahaha, static typing is
almost as dumb as Cartesian Dualism". The best case outcome is that
nobody cares. The worse case outcomes go down to hurt feelings and
flame wars from dualists.

> But the topic of keeping this forum safe for technical discussion
> entails that it must be safe for *any* idea to be the butt of a joke, be
> it a religious text or the Zen of Python, and that is very much
> on-topic.

It obviously isn't "safe" to joke about any topic, seeing as it caused
a derailment and new thread.

Devin

On Wed, Sep 28, 2011 at 11:05 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> Devin Jeanpierre <jeanpierreda at gmail.com> writes:
>
>> > Forget money, or even the love of money. The idea that one mustn't
>> > criticise another person's beliefs is the root of all evil.
>>
>> This was a technical discussion, and calling the bible a joke was not
>> necessary at all. It creates a hostile atmosphere.
>
> I disagree. It was not an attack on any person nor group of people. If
> we are to be required to avoid jokes not directed at people, then *that*
> is an atmosphere hostile to open friendly discussion.
>
>> Can't you pick somewhere else to attack Christianity?
>
> The person who wrote the ?bible is a joke? intended it as a flippant
> remark. Countless other flippant remarks pass through here all the time,
> making jokes at the expense of some idea or other. Christianity will not
> be an exception to that.
>
> If you find someone attacking people, I'll join you in ostracising the
> attacker. But no, don't attempt to silence jokes that attack an idea.
>
> Off-topic? If we start discussing the content of the ideas being
> attacked, yeah, I'd say religion is pretty off-topic.
>
> But the topic of keeping this forum safe for technical discussion
> entails that it must be safe for *any* idea to be the butt of a joke, be
> it a religious text or the Zen of Python, and that is very much
> on-topic.
>
> --
> ?\ ? ? ? ? ?We demand rigidly defined areas of doubt and uncertainty!? |
> ?`\ ? ??Vroomfondel, _The Hitch-Hiker's Guide To The Galaxy_, Douglas |
> _o__) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Adams |
> Ben Finney
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From petite.abeille at gmail.com  Thu Sep 29 15:32:20 2011
From: petite.abeille at gmail.com (Petite Abeille)
Date: Thu, 29 Sep 2011 21:32:20 +0200
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
Message-ID: <2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>


On Sep 29, 2011, at 8:49 PM, Devin Jeanpierre wrote:

>  It could certainly be _interpreted_ as an attack
> (and was interpreted that way), and that's really all that's necessary
> for a hostile environment.

In other news:

http://alt.textdrive.com/assets/public/non/nq050616.gif

--
Tout le monde il est beau, tout le monde il est gentil




From navkirat.py at gmail.com  Thu Sep 29 15:37:34 2011
From: navkirat.py at gmail.com (Navkirat Singh)
Date: Fri, 30 Sep 2011 01:07:34 +0530
Subject: [OT] Benefit and belief
In-Reply-To: <2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
Message-ID: <CAKzQzusJ9zRRDe1v8H1dDDcdyV_JUi2nS2WXvBhKrsv6Vb3aMQ@mail.gmail.com>

Hi,

I am looking for the python mailing list. . ? Have you guys seen it
somewhere? I think I accidently reached the cry-me-a-river list?

Regards,
Nav
On Sep 30, 2011 1:03 AM, "Petite Abeille" <petite.abeille at gmail.com> wrote:
>
> On Sep 29, 2011, at 8:49 PM, Devin Jeanpierre wrote:
>
>> It could certainly be _interpreted_ as an attack
>> (and was interpreted that way), and that's really all that's necessary
>> for a hostile environment.
>
> In other news:
>
> http://alt.textdrive.com/assets/public/non/nq050616.gif
>
> --
> Tout le monde il est beau, tout le monde il est gentil
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
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From ramit.prasad at jpmorgan.com  Thu Sep 29 15:39:48 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 29 Sep 2011 15:39:48 -0400
Subject: options for plotting points on geographic map
In-Reply-To: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
References: <d392bfe6-1a5a-42c2-a2b0-eaba33094e2f@j10g2000vbb.googlegroups.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F66B1B@EMARC112VS01.exchad.jpmchase.net>

>I see there is pymaps, a Python wrapper for Google Maps.  I may try
>that but it seems to be barely documented and would require making a
>webpage with javascript to display the map, whereas I'd probably
>prefer a desktop app for this--though I'd consider a web page (it's
>probably easier than I think).

You could create the webpage and then render it in your desktop app. I have seen plenty of apps like that.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423




This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ethan at stoneleaf.us  Thu Sep 29 15:52:23 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 29 Sep 2011 12:52:23 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
Message-ID: <4E84CC77.7060804@stoneleaf.us>

Petite Abeille wrote:
> On Sep 29, 2011, at 8:49 PM, Devin Jeanpierre wrote:
> 
>>  It could certainly be _interpreted_ as an attack
>> (and was interpreted that way), and that's really all that's necessary
>> for a hostile environment.
> 
> In other news:
> 
> http://alt.textdrive.com/assets/public/non/nq050616.gif


Okay, now that's funny.

~Ethan~


From ramit.prasad at jpmorgan.com  Thu Sep 29 15:52:52 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Thu, 29 Sep 2011 15:52:52 -0400
Subject: Question on Manipulating List and on Python
In-Reply-To: <CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
	<CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F66B77@EMARC112VS01.exchad.jpmchase.net>

-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Chris Angelico
Sent: Thursday, September 29, 2011 11:51 AM
To: python-list at python.org
Subject: Re: Question on Manipulating List and on Python

On Fri, Sep 30, 2011 at 2:36 AM, Subhabrata Banerjee
<subhagurgaon2011 at gmail.com> wrote:
> And Python seems faster than C++/Java. It is indeed. I also experience
> it.
>

Python compared to Java? Difficult to compare. Python to C++?
Impossible to compare. But performance depends MASSIVELY on
algorithmic quality; if you code the exact same thing in Python and in
C++, you would probably find that the C++ one is faster, but chances
are you're implementing approximately the same thing in two quite
different ways. Or possibly you're using a slow and inefficient
library or third-party function.

I've sometimes written code in one language and directly ported it to
another, and then run both on the same hardware. With most such
experiments, CPython generally doesn't perform all that well, and C or
C++ rocks. But frequently, the C/C++ code is more verbose and more
error-prone than the Python - because Python's biggest boast is not
that it's fast, but that it's *fast enough*, while being easy to work
with. (And every once in a while there's something where I want to use
a pointer to some other variable, and that's a concept that just plain
doesn't work in Python. You have references to objects, but you can't
from one place change another variable, without using some kind of
mutable object that they both reference.)
-----------------------------------------------------------------------


I think Steven D'Aprano had an excellent post on this a week or so ago (on the tutor list, not this one).

See: http://mail.python.org/pipermail/tutor/2011-September/085573.html 




Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



ChrisA
-- 
http://mail.python.org/mailman/listinfo/python-list
This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From petite.abeille at gmail.com  Thu Sep 29 15:54:54 2011
From: petite.abeille at gmail.com (Petite Abeille)
Date: Thu, 29 Sep 2011 21:54:54 +0200
Subject: [OT] Benefit and belief
In-Reply-To: <CAKzQzusJ9zRRDe1v8H1dDDcdyV_JUi2nS2WXvBhKrsv6Vb3aMQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<2B0B7132-9E4B-41E7-8710-959B03A89F24@gmail.com>
	<CAKzQzusJ9zRRDe1v8H1dDDcdyV_JUi2nS2WXvBhKrsv6Vb3aMQ@mail.gmail.com>
Message-ID: <3D981489-D106-459B-91C1-73DE3A45B79C@gmail.com>


On Sep 29, 2011, at 9:37 PM, Navkirat Singh wrote:

> I am looking for the python mailing list. . ? Have you guys seen it
> somewhere? I think I accidently reached the cry-me-a-river list?

The portal can be reactivated by intoning Bobby Brown Goes Down in unison.



From chris at simplistix.co.uk  Thu Sep 29 17:00:58 2011
From: chris at simplistix.co.uk (Chris Withers)
Date: Thu, 29 Sep 2011 22:00:58 +0100
Subject: TestFixtures 2.1.0 Released!
Message-ID: <4E84DC8A.4040508@simplistix.co.uk>

Hi All,

Another release of TestFixtures, getting things closer to where I want 
them to be.

The only change was:

- Add a "strict mode" to `compare`. When used, it ensures that
   the values compared are not only equal but also of the same
   type. This mode is not used by default, and the default mode
   restores the more commonly useful functionality where values of
   similar types but that aren't equal give useful feedback about
   differences.

For details, read:

http://packages.python.org/testfixtures/comparing.html#strict-comparison

The full list of changes can be found here:

http://packages.python.org/testfixtures/changes.html

The package is on PyPI and a full list of all the links to docs, issue 
trackers and the like can be found here:

http://www.simplistix.co.uk/software/python/testfixtures

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
            - http://www.simplistix.co.uk


From anikom15 at gmail.com  Thu Sep 29 17:20:15 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 14:20:15 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
Message-ID: <20110929212015.GA11663@Smoke>

On Thu, Sep 29, 2011 at 02:49:05PM -0400, Devin Jeanpierre wrote:
> >> This was a technical discussion, and calling the bible a joke was not
> >> necessary at all. It creates a hostile atmosphere.
> >
> > I disagree. It was not an attack on any person nor group of people. If
> > we are to be required to avoid jokes not directed at people, then *that*
> > is an atmosphere hostile to open friendly discussion.
> 
> Well. It wasn't directly an attack on people exactly. It did mention
> believers directly. It could certainly be _interpreted_ as an attack
> (and was interpreted that way), and that's really all that's necessary
> for a hostile environment.
> 
> I'm not saying we should censor ourselves exactly. I've always been
> opposed to harsh _rules_ about what's appropriate and what
> isn't. But I do think it's important to consider others' feelings.
> Just because it isn't an attack, doesn't mean it can't hurt peoples'
> feelings, and I think hurting peoples' feelings is something worth
> going out of your way to avoid.
> 
> Anyway, if it was a joke before, it isn't when somebody starts calling
> some "group of people" "organised conspiracies to support and protect
> child molesters".
> 
> > The person who wrote the ?bible is a joke? intended it as a flippant
> > remark. Countless other flippant remarks pass through here all the time,
> > making jokes at the expense of some idea or other. Christianity will not
> > be an exception to that.
> 
> That doesn't make it right. Is it OK to make fun of arbitrary ideas as
> "jokes"? I don't think so. It seems, again, hurtful. Especially when
> the idea is totally unrelated. It's like we're having a discussion
> about dynamic typing and somebody blurts out "Hahaha, static typing is
> almost as dumb as Cartesian Dualism". The best case outcome is that
> nobody cares. The worse case outcomes go down to hurt feelings and
> flame wars from dualists.
> 
> > But the topic of keeping this forum safe for technical discussion
> > entails that it must be safe for *any* idea to be the butt of a joke, be
> > it a religious text or the Zen of Python, and that is very much
> > on-topic.
> 
> It obviously isn't "safe" to joke about any topic, seeing as it caused
> a derailment and new thread.
> 

Sometimes it's just not appropriate to joke.  Save them for the dates.


From ben+python at benfinney.id.au  Thu Sep 29 17:24:15 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 07:24:15 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
Message-ID: <87r52z2gao.fsf@benfinney.id.au>

Passiday <passiday at gmail.com> writes:

> Oh, my. Who could expect this topic would iterate to some whining
> about religion (please don't respond on this remark of mine).

That's an unreasonable request. If you make a provocative remark (I
doubt you chose to use ?whining? without knowing how dismissive it is),
it's disingenuous to then ask that people please not respond.

-- 
 \     ?If nothing changes, everything will remain the same.? ?Barne's |
  `\                                                               Law |
_o__)                                                                  |
Ben Finney


From ben+python at benfinney.id.au  Thu Sep 29 17:32:42 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 07:32:42 +1000
Subject: [OT] Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<mailman.1566.1317305041.27778.python-list@python.org>
Message-ID: <87mxdn2fwl.fsf@benfinney.id.au>

MRAB <python at mrabarnett.plus.com> writes:

> On 29/09/2011 04:05, Ben Finney wrote:
> > But the topic of keeping this forum safe for technical discussion
> > entails that it must be safe for *any* idea to be the butt of a
> > joke, be it a religious text or the Zen of Python, and that is very
> > much on-topic.
>
> Even if it offends Python worshippers?
> http://www.youtube.com/watch?v=asUyK6JWt9U

Even then. People who remain attached to ideas are being unreasonable if
they take a joke about that idea personally. No idea, certainly not any
religion, gets any special exemption.

-- 
 \     ?On the other hand, you have different fingers.? ?Steven Wright |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From anikom15 at gmail.com  Thu Sep 29 17:33:34 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 14:33:34 -0700
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <4E847A8F.3070401@mrabarnett.plus.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
Message-ID: <20110929213334.GB11663@Smoke>

I'm kind of new to the whole mailing list thing, but they seem to be a
lot more lenient than internet forums about most things.  I've noticed
that sometimes Off-topic posts can get a little out of hand.  I guess
it's not really a big deal, but it bothers me, and the trolls just love
to feed on it.  I mean, as programmers, we should devote our time to
improving computer systems.  On this mailing list, we're programmers,
nothing else, and so we shouldn't mingle other things into the list.
Think of it as using global variables or even a goto.  That's
essentially what OT is.  It just serves to obfuscate valuable answers to
good programming questions.


From rosuav at gmail.com  Thu Sep 29 17:40:13 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 07:40:13 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <20110929213334.GB11663@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<20110929213334.GB11663@Smoke>
Message-ID: <CAPTjJmo1GmVcaF6LuX=N8mS66KwnHfYsKthy84xNp-DnpWpa2g@mail.gmail.com>

On Fri, Sep 30, 2011 at 7:33 AM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> On this mailing list, we're programmers,
> nothing else, and so we shouldn't mingle other things into the list.
> Think of it as using global variables or even a goto. ?That's
> essentially what OT is.

Not a bad analogy, that... but I accept it in perhaps not the same way
as you intended it.

I don't mind using a global variable once in a while. I don't object
to a well-placed goto, especially when it's clear and obvious what
it's doing. And the occasional off-topic post or thread on a mailing
list isn't the end of the world either.

ChrisA


From ben+python at benfinney.id.au  Thu Sep 29 18:01:32 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 08:01:32 +1000
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
Message-ID: <20110929220132.GD2715@benfinney.id.au>

On 29-Sep-2011, Devin Jeanpierre wrote:
> >> This was a technical discussion, and calling the bible a joke was not
> >> necessary at all. It creates a hostile atmosphere.
> >
> > I disagree. It was not an attack on any person nor group of people. If
> > we are to be required to avoid jokes not directed at people, then *that*
> > is an atmosphere hostile to open friendly discussion.
> 
> Well. It wasn't directly an attack on people exactly. It did mention
> believers directly.

It did not. It mentioned only a pair of texts: the bible, and the Zen of
Python. Texts are not people, and we should not go out of our way to
protect them from jokes or criticism.

> It could certainly be _interpreted_ as an attack (and was interpreted
> that way), and that's really all that's necessary for a hostile
> environment.

Nonsense. *Any* joke could be interpreted as an attack; the issue is
whether it's reasonable to do so. Anyone who is so confused as to take a
joke about a book as an attack on people is being quite unreasonable, and
we should not restrain our jokes for the sake of that.

> I'm not saying we should censor ourselves exactly. I've always been
> opposed to harsh _rules_ about what's appropriate and what
> isn't. But I do think it's important to consider others' feelings.

Agreed. But only to the extent that attacks *on those people* are
concerned. Peoples feelings about ideas are not a consideration when
discussing ideas, and certainly not when joking about ideas.

> Just because it isn't an attack, doesn't mean it can't hurt peoples'
> feelings, and I think hurting peoples' feelings is something worth
> going out of your way to avoid.

There we disagree. The hurt feelings of someone who attaches their identity
to a text should not restrain our discourse.

> Anyway, if it was a joke before, it isn't when somebody starts calling
> some "group of people" "organised conspiracies to support and protect
> child molesters".

The group of people to whom that refers, the administrative hierarchy of
the Catholic Church, have been doing exactly what the quotation says.

I agree that's not a joke; it's a matter of fact, and relevant in the
context where it was mentioned.

> Is it OK to make fun of arbitrary ideas as "jokes"? I don't think so.

Yes, a thousand times yes. Ideas are not people, have no rights, and get no
exemption from criticism or dismissal or attack or ridicule.

> It seems, again, hurtful. Especially when the idea is totally unrelated.

That would eliminate just about every joke: a huge range of jokes *depend*
for their humour on connecting seemingly-unrelated ideas. So by your logic,
we don't get to make those jokes here.

> It's like we're having a discussion about dynamic typing and somebody
> blurts out "Hahaha, static typing is almost as dumb as Cartesian
> Dualism". The best case outcome is that nobody cares. The worse case
> outcomes go down to hurt feelings and flame wars from dualists.

And the joke would still be okay, and it would be silly for anyone to take
it as hurtful.

You can call such a joke off-topic, and I'd agree. You can say it's not
very funny, and I'd agree. You can say it's undeserving of a flame war, and
I'd agree wholeheartedly.

But whoever takes that joke and says it's deliberately hurtful is being
presumptuous and censorious and unreasonable. If they then castigate the
joker for supposedly hurting someone's feelings, it's at that point the
atmosphere turns hostile to discussion.

-- 
 \         ?The most dangerous man to any government is the man who is |
  `\       able to think things out for himself, without regard to the |
_o__)          prevailing superstitions and taboos.? ?Henry L. Mencken |
Ben Finney <ben at benfinney.id.au>
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From ian.g.kelly at gmail.com  Thu Sep 29 18:12:51 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 16:12:51 -0600
Subject: Suggested coding style
In-Reply-To: <fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <CALwzid==3YBr-NWaZBBb03uByB+mgkbUnEF1Fzk98D_=CW8YvA@mail.gmail.com>

On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingrick at gmail.com> wrote:
> A specific method for padding a string with ONLY zeros is ludicrous
> and exposes the narrow mindedness of the creator. The only thing worse
> than "zfill" as a string method is making zfill into built-in
> function! The ONLY proper place for zfill is as an option in the
> str.format() method.
>
> py> "{0:zf10}".format(1234) -> "00000000001234"

Agree that zfill seems to be redundant with str.format, although your
suggested syntax is atrocious, especially since a syntax already
exists that fits better in the already-complicated format specifier
syntax.

"{0:=010d}".format(1234) -> "0000001234"

There are a couple of warts with the existing implementation, however:

1) str.zfill() operates on strings; the .format() syntax operates on
numeric types.  I would suggest that the "=" fill alignment in format
specifiers should be extended to do the same thing as zfill when given
a string.

2) It seems to not behave as documented for floats.  I expect:

"{0:=010f}".format(-32.7) -> "-0000032.7"

I get:

"{0:=010f}".format(-32.7) -> "-32.700000"

On the other hand, I can't imagine why I would ever actually want the
expected result, so maybe it's not a big deal.


From clp2 at rebertia.com  Thu Sep 29 18:16:43 2011
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 29 Sep 2011 15:16:43 -0700
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <20110929213334.GB11663@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<20110929213334.GB11663@Smoke>
Message-ID: <CAMZYqRQrUWqRaf-rKB=a9WUHX9L0tOuNtEp0+V9xy6XJCzGyLg@mail.gmail.com>

On Thu, Sep 29, 2011 at 2:33 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> I'm kind of new to the whole mailing list thing, but they seem to be a
> lot more lenient than internet forums about most things. ?I've noticed
> that sometimes Off-topic posts can get a little out of hand. ?I guess
> it's not really a big deal, but it bothers me, and the trolls just love
> to feed on it. ?I mean, as programmers, we should devote our time to
> improving computer systems.

This is why good mail clients have a "Mute" or equivalent function to
ignore an entire thread and not let it waste any more of your time.

You may want to plonk Xah and the ranter who goes by Rick while you're at it. :)

Cheers,
Chris


From rantingrick at gmail.com  Thu Sep 29 18:56:57 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 15:56:57 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
Message-ID: <db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>

On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
> > A specific method for padding a string with ONLY zeros is ludicrous
> > and exposes the narrow mindedness of the creator. The only thing worse
> > than "zfill" as a string method is making zfill into built-in
> > function! The ONLY proper place for zfill is as an option in the
> > str.format() method.
>
> > py> "{0:zf10}".format(1234) -> "00000000001234"
>
> Agree that zfill seems to be redundant with str.format, although your
> suggested syntax is atrocious, especially since a syntax already
> exists that fits better in the already-complicated format specifier
> syntax.

It's interesting that you find the format specifier "complicated". I
will admit that upon first glance i lamented the new format method
spec and attempted to cling to the old string interpolation crap.
However, as you use the new format method you will come to appreciate
it. It's an adult beverage with an acquired taste. ;-)

One thing that may help format noobs is to look at the spec as two
parts; the part before the colon and the part after the colon. If you
break it down in this manner the meaning starts to shine through. I
will agree, it is a lot of cryptic info squeezed into a small space
HOWEVER you would no want a verbose format specification.

But i wholeheartedly agree with you points and i would say the zfill
method has no future uses in the stdlib except for historical reasons.
We should deprecate it now.


> "{0:=010d}".format(1234) -> "0000001234"
>
> There are a couple of warts with the existing implementation, however:
>
> 1) str.zfill() operates on strings; the .format() syntax operates on
> numeric types. ?I would suggest that the "=" fill alignment in format
> specifiers should be extended to do the same thing as zfill when given
> a string.

EXACTLY!

PS: Has anyone noticed all the off topic chatter about religion and
feelings? Since the main subject of this thread is about zfill i can't
help but wonder if the minions where sent out to present a distraction
with "scripted" pseudo arguments. Just an observation.


From jeanpierreda at gmail.com  Thu Sep 29 19:03:24 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Thu, 29 Sep 2011 19:03:24 -0400
Subject: [OT] Benefit and belief
In-Reply-To: <20110929220132.GD2715@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
Message-ID: <CABicbJKDws8sv+9FkPHknQjabGCK-x7j=kZnLtrS+YV-Gx7DLQ@mail.gmail.com>

> There we disagree. The hurt feelings of someone who attaches their identity
> to a text should not restrain our discourse.

Yes, we do.

> That would eliminate just about every joke: a huge range of jokes *depend*
> for their humour on connecting seemingly-unrelated ideas. So by your logic,
> we don't get to make those jokes here.

I didn't have much logic. I just don't think it's nice to do things
that hurt other people, and if we can, we should avoid those things.
Avoiding them is pretty easy here.

> But whoever takes that joke and says it's deliberately hurtful is being
> presumptuous and censorious and unreasonable. If they then castigate the
> joker for supposedly hurting someone's feelings, it's at that point the
> atmosphere turns hostile to discussion.

I don't really care about the "joke". I honestly I didn't understand
it as a joke, which would drive most of my disagrement. I don't think
it should have been made, yes. I take major issue with the
anti-Christian rant that appeared afterward, but I haven't really
taken much opportunity to attack it because it doesn't matter. All I'd
like is for people to be a little more friendly, if you please.

I also didn't reprimand anyone, except maybe Steven.

But anyway, no, we don't agree on what it means to be friendly or what
a hostile atmosphere is. I've noticed that people tend to be a lot
harsher here than what I'm used to, so perhaps your attitude to it is
more common on mailing-lists and I should just adapt.

Devin

On Thu, Sep 29, 2011 at 6:01 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> On 29-Sep-2011, Devin Jeanpierre wrote:
>> >> This was a technical discussion, and calling the bible a joke was not
>> >> necessary at all. It creates a hostile atmosphere.
>> >
>> > I disagree. It was not an attack on any person nor group of people. If
>> > we are to be required to avoid jokes not directed at people, then *that*
>> > is an atmosphere hostile to open friendly discussion.
>>
>> Well. It wasn't directly an attack on people exactly. It did mention
>> believers directly.
>
> It did not. It mentioned only a pair of texts: the bible, and the Zen of
> Python. Texts are not people, and we should not go out of our way to
> protect them from jokes or criticism.
>
>> It could certainly be _interpreted_ as an attack (and was interpreted
>> that way), and that's really all that's necessary for a hostile
>> environment.
>
> Nonsense. *Any* joke could be interpreted as an attack; the issue is
> whether it's reasonable to do so. Anyone who is so confused as to take a
> joke about a book as an attack on people is being quite unreasonable, and
> we should not restrain our jokes for the sake of that.
>
>> I'm not saying we should censor ourselves exactly. I've always been
>> opposed to harsh _rules_ about what's appropriate and what
>> isn't. But I do think it's important to consider others' feelings.
>
> Agreed. But only to the extent that attacks *on those people* are
> concerned. Peoples feelings about ideas are not a consideration when
> discussing ideas, and certainly not when joking about ideas.
>
>> Just because it isn't an attack, doesn't mean it can't hurt peoples'
>> feelings, and I think hurting peoples' feelings is something worth
>> going out of your way to avoid.
>
> There we disagree. The hurt feelings of someone who attaches their identity
> to a text should not restrain our discourse.
>
>> Anyway, if it was a joke before, it isn't when somebody starts calling
>> some "group of people" "organised conspiracies to support and protect
>> child molesters".
>
> The group of people to whom that refers, the administrative hierarchy of
> the Catholic Church, have been doing exactly what the quotation says.
>
> I agree that's not a joke; it's a matter of fact, and relevant in the
> context where it was mentioned.
>
>> Is it OK to make fun of arbitrary ideas as "jokes"? I don't think so.
>
> Yes, a thousand times yes. Ideas are not people, have no rights, and get no
> exemption from criticism or dismissal or attack or ridicule.
>
>> It seems, again, hurtful. Especially when the idea is totally unrelated.
>
> That would eliminate just about every joke: a huge range of jokes *depend*
> for their humour on connecting seemingly-unrelated ideas. So by your logic,
> we don't get to make those jokes here.
>
>> It's like we're having a discussion about dynamic typing and somebody
>> blurts out "Hahaha, static typing is almost as dumb as Cartesian
>> Dualism". The best case outcome is that nobody cares. The worse case
>> outcomes go down to hurt feelings and flame wars from dualists.
>
> And the joke would still be okay, and it would be silly for anyone to take
> it as hurtful.
>
> You can call such a joke off-topic, and I'd agree. You can say it's not
> very funny, and I'd agree. You can say it's undeserving of a flame war, and
> I'd agree wholeheartedly.
>
> But whoever takes that joke and says it's deliberately hurtful is being
> presumptuous and censorious and unreasonable. If they then castigate the
> joker for supposedly hurting someone's feelings, it's at that point the
> atmosphere turns hostile to discussion.
>
> --
> ?\ ? ? ? ? ?The most dangerous man to any government is the man who is |
> ?`\ ? ? ? able to think things out for himself, without regard to the |
> _o__) ? ? ? ? ?prevailing superstitions and taboos.? ?Henry L. Mencken |
> Ben Finney <ben at benfinney.id.au>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From jeanpierreda at gmail.com  Thu Sep 29 19:07:28 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Thu, 29 Sep 2011 19:07:28 -0400
Subject: Suggested coding style
In-Reply-To: <db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
Message-ID: <CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>

> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)

Yeah. It's a much more difficult to read thing, but once you learn how
to write it it flows faster.

Of course, I never managed to learn how to write it...

I would suggest that rather than being "complicated" it is "dense".

> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.

May I suggest a email client that can group mailing list threads?
Also, not accusing others of conspiracies.

Devin

On Thu, Sep 29, 2011 at 6:56 PM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
>> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
>> > A specific method for padding a string with ONLY zeros is ludicrous
>> > and exposes the narrow mindedness of the creator. The only thing worse
>> > than "zfill" as a string method is making zfill into built-in
>> > function! The ONLY proper place for zfill is as an option in the
>> > str.format() method.
>>
>> > py> "{0:zf10}".format(1234) -> "00000000001234"
>>
>> Agree that zfill seems to be redundant with str.format, although your
>> suggested syntax is atrocious, especially since a syntax already
>> exists that fits better in the already-complicated format specifier
>> syntax.
>
> It's interesting that you find the format specifier "complicated". I
> will admit that upon first glance i lamented the new format method
> spec and attempted to cling to the old string interpolation crap.
> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)
>
> One thing that may help format noobs is to look at the spec as two
> parts; the part before the colon and the part after the colon. If you
> break it down in this manner the meaning starts to shine through. I
> will agree, it is a lot of cryptic info squeezed into a small space
> HOWEVER you would no want a verbose format specification.
>
> But i wholeheartedly agree with you points and i would say the zfill
> method has no future uses in the stdlib except for historical reasons.
> We should deprecate it now.
>
>
>> "{0:=010d}".format(1234) -> "0000001234"
>>
>> There are a couple of warts with the existing implementation, however:
>>
>> 1) str.zfill() operates on strings; the .format() syntax operates on
>> numeric types. ?I would suggest that the "=" fill alignment in format
>> specifiers should be extended to do the same thing as zfill when given
>> a string.
>
> EXACTLY!
>
> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From vacorama at gmail.com  Thu Sep 29 19:11:02 2011
From: vacorama at gmail.com (ron)
Date: Thu, 29 Sep 2011 16:11:02 -0700 (PDT)
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <0acaf956-3285-4d0c-98ea-61f7ce88a3ba@x19g2000vbl.googlegroups.com>

On Sep 29, 5:21?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> I have a Python script which I would like to test without a tty attached
> to the process. I could run it as a cron job, but is there an easier way?
>
> I am running Linux.
>
> --
> Steven

Have you tried GNU Screen?  It let's you run processes under virtual
terminals, which can then be backgrounded, reconnected to, etc.  I
think it comes with most linux distros.


From rosuav at gmail.com  Thu Sep 29 19:12:50 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 09:12:50 +1000
Subject: [OT] Benefit and belief
In-Reply-To: <CABicbJKDws8sv+9FkPHknQjabGCK-x7j=kZnLtrS+YV-Gx7DLQ@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<CABicbJKDws8sv+9FkPHknQjabGCK-x7j=kZnLtrS+YV-Gx7DLQ@mail.gmail.com>
Message-ID: <CAPTjJmq-XRSM9VXxOoQQ+GvDKZZpQdbB1+tyVxSV-6TG18YMoA@mail.gmail.com>

On Fri, Sep 30, 2011 at 9:03 AM, Devin Jeanpierre
<jeanpierreda at gmail.com> wrote:
> But anyway, no, we don't agree on what it means to be friendly or what
> a hostile atmosphere is. I've noticed that people tend to be a lot
> harsher here than what I'm used to, so perhaps your attitude to it is
> more common on mailing-lists and I should just adapt.
>

I'm told that there are other mailing lists / newsgroups that are far,
FAR more hostile than this. Haven't explored though, as I don't feel
like torturing myself :)

As to the original offensiveness, though: I'm a fundamentalist
Christian (not Catholic though), and I water-off-a-duck's-backed the
insult. If it's true, it's allowed to be offensive; if it's not true,
I can distance myself from it. (In this case, the latter; the inner
issues of the Catholic church are unconnected to the core of
Christianity.)

Chris Angelico


From ethan at stoneleaf.us  Thu Sep 29 19:21:25 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 29 Sep 2011 16:21:25 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <20110929220132.GD2715@benfinney.id.au>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
Message-ID: <4E84FD75.5050907@stoneleaf.us>

Ben Finney wrote:
> But whoever takes that joke and says it's deliberately hurtful is being
> presumptuous and censorious and unreasonable. If they then castigate the
> joker for supposedly hurting someone's feelings, it's at that point the
> atmosphere turns hostile to discussion.

Um, wasn't it RantingRick who made this 'joke'?  Do you honestly believe 
he /wasn't/ trying to be offensive?

~Ethan~


From python at mrabarnett.plus.com  Thu Sep 29 19:37:08 2011
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 30 Sep 2011 00:37:08 +0100
Subject: [OT] Benefit and belief
In-Reply-To: <4E84FD75.5050907@stoneleaf.us>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
Message-ID: <4E850124.8070508@mrabarnett.plus.com>

On 30/09/2011 00:21, Ethan Furman wrote:
> Ben Finney wrote:
>> But whoever takes that joke and says it's deliberately hurtful is being
>> presumptuous and censorious and unreasonable. If they then castigate the
>> joker for supposedly hurting someone's feelings, it's at that point the
>> atmosphere turns hostile to discussion.
>
> Um, wasn't it RantingRick who made this 'joke'? Do you honestly believe
> he /wasn't/ trying to be offensive?
>
rantingrick:
"""Since, like the bible the zen is self contradicting, any argument 
utilizing
the zen can be defeated utilizing the zen."""

alex23:
"""And like the Bible, the Zen was created by humans as a joke. If you're
taking it too seriously, that's your problem."""


From ethan at stoneleaf.us  Thu Sep 29 19:40:59 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 29 Sep 2011 16:40:59 -0700
Subject: [OT] Benefit and belief
In-Reply-To: <4E84FD75.5050907@stoneleaf.us>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>	<mailman.1549.1317260469.27778.python-list@python.org>	<87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
Message-ID: <4E85020B.30207@stoneleaf.us>

Ethan Furman wrote:
> Ben Finney wrote:
>> But whoever takes that joke and says it's deliberately hurtful is being
>> presumptuous and censorious and unreasonable. If they then castigate the
>> joker for supposedly hurting someone's feelings, it's at that point the
>> atmosphere turns hostile to discussion.
> 
> Um, wasn't it RantingRick who made this 'joke'?  Do you honestly believe 
> he /wasn't/ trying to be offensive?

Okay, that's what I get for skimming -- it was alex23, not rr.  My 
apologies, rr, for the misattribution.

~Ethan~


From rantingrick at gmail.com  Thu Sep 29 19:41:34 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 16:41:34 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<mailman.1596.1317337691.27778.python-list@python.org>
Message-ID: <30b05df7-6f16-45fd-bbe8-7f6c09d2e6e1@i28g2000yqn.googlegroups.com>

On Sep 29, 6:07?pm, Devin Jeanpierre <jeanpierr... at gmail.com> wrote:
> > However, as you use the new format method you will come to appreciate
> > it. It's an adult beverage with an acquired taste. ;-)
>
> Yeah. It's a much more difficult to read thing, but once you learn how
> to write it it flows faster.
>
> Of course, I never managed to learn how to write it...

A good way to start out is to just use the positional arguments.

py> name = "Bob"

py> "Hello my name is {0}".format(name)
Hello my name is Bob

py> "Hello my name is {name}".format(name=name)
Hello my name is Bob

py> "Hello my name is {0}. My named spelled backwards is:
{0}".format(name)
Hello my name is Bob. My named spelled backwards is: Bob

py> "A small fry cost {0:0.2f}".format(1.6666666)
A small fry cost 1.67

py> "A small car cost {0:,.2f}".format(11666.6666)
A small car cost 11,666.67

# Python 2.7+ you can omit the index.
py> "{} = {}".format("value",2)
value = 2

Start with the small stuff and then diversify! You'll be glad you made
the change.


From rantingrick at gmail.com  Thu Sep 29 19:47:40 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 16:47:40 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
Message-ID: <1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>

On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
> > A specific method for padding a string with ONLY zeros is ludicrous
> > and exposes the narrow mindedness of the creator. The only thing worse
> > than "zfill" as a string method is making zfill into built-in
> > function! The ONLY proper place for zfill is as an option in the
> > str.format() method.
>
> > py> "{0:zf10}".format(1234) -> "00000000001234"
>
> Agree that zfill seems to be redundant with str.format, although your
> suggested syntax is atrocious, especially since a syntax already
> exists that fits better in the already-complicated format specifier
> syntax.
>
> "{0:=010d}".format(1234) -> "0000001234"
>
> There are a couple of warts with the existing implementation, however:
>
> 1) str.zfill() operates on strings; the .format() syntax operates on
> numeric types. ?I would suggest that the "=" fill alignment in format
> specifiers should be extended to do the same thing as zfill when given
> a string.

Ah ha! Found the answer!

py> "{0:010d}".format(1234)
0000001234

py> "{0:0>10}".format(1234)
0000001234

py> "{0:0>10}".format("1234")
0000001234

py> "{0:@>10}".format("1234")
@@@@@@1234

I would skip using the "{int}{repeat}d" syntax and just use the string
padding since you won't need to worry about the input data type. I
hate specificity types in string formats. With the old interpolation i
ALWAYS used %s for everything.


From rantingrick at gmail.com  Thu Sep 29 20:04:40 2011
From: rantingrick at gmail.com (rantingrick)
Date: Thu, 29 Sep 2011 17:04:40 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1600.1317339708.27778.python-list@python.org>
Message-ID: <dee341b4-d2c0-42bf-825e-3e45b50c0c94@j1g2000yqj.googlegroups.com>

On Sep 29, 6:40?pm, Ethan Furman <et... at stoneleaf.us> wrote:
> Okay, that's what I get for skimming -- it was alex23, not rr. ?My
> apologies, rr, for the misattribution.

Oh don't worry Ethan, this is not the first time I've been falsely
accused, misquoted, and kicked in the testicles, and i'm quite sure
with this fine group of folks it won't be the last either.


From ben+python at benfinney.id.au  Thu Sep 29 22:06:56 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 12:06:56 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
Message-ID: <87bou23hrz.fsf@benfinney.id.au>

Westley Mart?nez <anikom15 at gmail.com> writes:

> I'm kind of new to the whole mailing list thing, but they seem to be a
> lot more lenient than internet forums about most things.

Note that a mailing list *is* an internet forum: it is a forum for
discussion, conducted on the internet. Mailing lists have been internet
forums long before any web application came along.

> I've noticed that sometimes Off-topic posts can get a little out of
> hand. I guess it's not really a big deal, but it bothers me, and the
> trolls just love to feed on it.

Yes, these are hazards of an unmoderated discussion forum like this. The
overall quality of discussion here, and the signal-to-noise ratio, makes
it very worthwhile I think.

> I mean, as programmers, we should devote our time to improving
> computer systems. On this mailing list, we're programmers, nothing
> else, and so we shouldn't mingle other things into the list.

What counts as ?mingle other things in?? What sparked this latest outcry
was a flippant remark at the expense of an ancient text and the Zen of
Python. That outcry was, I have argued, not reasonable.

I am firmly committed to allowing flippant remarks which are not at the
expense of people. It's highly inappropriate to ask that such remarks
not be made simply because some people might take undue offense.

Are they off-topic? Maybe, but there's no compulsion to respond to them
since flippant remarks, by definition, aren't meant seriously.

Are they not funny? That doesn't matter. If the obligation is that
people should not make unfunny jokes, we'd all be guilty.

Are they poking fun at something? That *definitely* shouldn't matter; if
a thing (not a person) is worth defending, then do so or not as you
choose. If you like it but can't defend it adequately, that's your
problem not anyone else's. If the ridicule works because it's true, then
the target thing is perhaps not worth defending.

We draw the line, IMO rightly so, at personal attacks on people or
groups of people. I have many times spoken out against those in this
forum. But books and ideas, no matter who likes them, are fair game for
flippant remarks in this and any forum, and I resist efforts to quash
such expression.

-- 
 \          ?What I have to do is see, at any rate, that I do not lend |
  `\      myself to the wrong which I condemn.? ?Henry Thoreau, _Civil |
_o__)                                                    Disobedience_ |
Ben Finney


From ben+python at benfinney.id.au  Thu Sep 29 22:10:16 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 12:10:16 +1000
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<0acaf956-3285-4d0c-98ea-61f7ce88a3ba@x19g2000vbl.googlegroups.com>
Message-ID: <877h4q3hmf.fsf@benfinney.id.au>

ron <vacorama at gmail.com> writes:

> On Sep 29, 5:21?am, Steven D'Aprano <steve
> +comp.lang.pyt... at pearwood.info> wrote:
> > I have a Python script which I would like to test without a tty attached
> > to the process. I could run it as a cron job, but is there an easier way?
>
> Have you tried GNU Screen?  It let's you run processes under virtual
> terminals, which can then be backgrounded, reconnected to, etc.  I
> think it comes with most linux distros.

That would not satisfy the ?without a TTY attached? requirement. GNU
Screen's main goal is to *provide* an attached TTY to multiple processes
when the TTY isn't interacting with the user.

I don't know whether Screen can *remove* a TTY from a process, and it
would be strange to me if it did so.

-- 
 \         ?I have yet to see any problem, however complicated, which, |
  `\      when you looked at it in the right way, did not become still |
_o__)                                more complicated.? ?Paul Anderson |
Ben Finney


From derek at simkowiak.net  Thu Sep 29 22:16:52 2011
From: derek at simkowiak.net (Derek Simkowiak)
Date: Thu, 29 Sep 2011 19:16:52 -0700
Subject: Motion Tracking with Python
Message-ID: <4E852694.4080303@simkowiak.net>

Hello,
I have a neat Python project I'd like to share. It does real-time motion 
tracking, using the Python bindings to the OpenCV library:

http://derek.simkowiak.net/motion-tracking-with-python/

There is a YouTube video showing the script in action.

It's especially neat because my daughter and I worked together on this 
project. We used it to track her two pet gerbils, as part of her science 
fair project. She wrote her own (separate) Python script to read the 
motion tracking log files, compute distance and velocity, and then 
export those values in a CSV file. Like I say on the web page: "I?m 
convinced that Python is the best language currently available for 
teaching kids how to program."

I also use Python professionally, and it's worked out great every time. 
There's no job Python can't handle.


Thanks,
Derek Simkowiak
http://derek.simkowiak.net



From steve+comp.lang.python at pearwood.info  Thu Sep 29 22:38:01 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 12:38:01 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
Message-ID: <4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>

Westley Mart?nez wrote:

> On this mailing list, we're programmers, nothing else, 

Speak for yourself.



-- 
Steven



From rosuav at gmail.com  Thu Sep 29 22:48:17 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 12:48:17 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CAPTjJmoxycEXE_x62gTa4-syGcp617O8GgNKXzJy4ksA_Xn3qA@mail.gmail.com>

On Fri, Sep 30, 2011 at 12:38 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Westley Mart?nez wrote:
>
>> On this mailing list, we're programmers, nothing else,
>
> Speak for yourself.
>

I don't think he meant that the populace here is exclusively
programmers, but that *on this list* we are here because we're
programmers. We may happen to have coincidental interest in (say)
music, but just because some group of us (or even all of us) all enjoy
music does not mean that it'd be on-topic to have a discussion of the
tetrachord of Mercury.

ChrisA


From wuwei23 at gmail.com  Thu Sep 29 22:50:27 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 19:50:27 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
Message-ID: <f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>

On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:
> What is so bad about breaking code in obscure places?

Try coding in PHP across minor release versions and see how you feel
about deprecating core functions on a whim.

> We changed print
> to a function which broke just about every piece of code every written
> in this language.

In a well declared _break_ with backwards compatibility. Not on a whim
between minor releases.

> (BTW, print should ALWAYS have been a function!)

Unfortunately, not everyone is as infallible as you. Or as
intractable. Coding styles change over time: this is a concept known
as "progress", although it's not as obvious in monocultures, so you
may not have heard of it.

> What is so bad then about breaking some very obscure code?

Because while you say "some very obscure code", what you really mean
is "code that isn't mine".

> GvR should be texting me every night in hopes that some of my API genius will rub
> off on him.

Are you off your medication again?

> I believe GvR had a "mid-dev-crisis"[...]

You seem to believe a lot of absolute garbage. As you have no access
to the inner states of _any_ of the people you regularly condemn here
with your hypocritical attacks, I've no idea why you consider yourself
to be an expert on their desires and opinions.



From wuwei23 at gmail.com  Thu Sep 29 23:05:26 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:05:26 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
Message-ID: <284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>

On Sep 30, 9:37?am, MRAB <pyt... at mrabarnett.plus.com> wrote:
> rantingrick:
> """Since, like the bible the zen is self contradicting, any argument
> utilizing
> the zen can be defeated utilizing the zen."""
>
> alex23:
> """And like the Bible, the Zen was created by humans as a joke. If you're
> taking it too seriously, that's your problem."""

Strangely, calling the bible self-contradictory wasn't seen as
inflammatory...

Seeing the quotes again, I'm pretty sure I was intending to be
flippant _in reference to rantrantrantrick's comment_. Given that it
was a response to someone else referring to the bible _and_ it made a
point about the zen, I'm not entirely sure why my comment was OT.

Again, if you want to disagree with my remark, knock yourself out. If
you want to take it as a personal attack, then there's nothing I can
do to stop you. But do realise that it is _you_ who is interpreting it
as such, and then recall the provision your very own Christ stated
about judging the actions of others: within your own belief system
_it's not your right to do so_.

That never seems to reduce the moral outrage though...


From steve+comp.lang.python at pearwood.info  Thu Sep 29 23:10:07 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 13:10:07 +1000
Subject: [OT] Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
Message-ID: <4e853310$0$29996$c3e8da3$5496439d@news.astraweb.com>

Devin Jeanpierre wrote:

> I also didn't reprimand anyone, except maybe Steven.

If you are more upset at my describing the Catholic Church as protecting
child molesters than you are at the Church for actually protecting child
molesters, then your priorities are completely screwed up and your
reprimand means less than nothing to me. I wear it as a badge of honour.


-- 
Steven



From steve+comp.lang.python at pearwood.info  Thu Sep 29 23:19:28 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 13:19:28 +1000
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
Message-ID: <4e853541$0$29997$c3e8da3$5496439d@news.astraweb.com>

Chris Angelico wrote:

> On Fri, Sep 30, 2011 at 12:38 PM, Steven D'Aprano
> <steve+comp.lang.python at pearwood.info> wrote:
>> Westley Mart?nez wrote:
>>
>>> On this mailing list, we're programmers, nothing else,
>>
>> Speak for yourself.
>>
> 
> I don't think he meant that the populace here is exclusively
> programmers, but that *on this list* we are here because we're
> programmers. We may happen to have coincidental interest in (say)
> music, but just because some group of us (or even all of us) all enjoy
> music does not mean that it'd be on-topic to have a discussion of the
> tetrachord of Mercury.

I didn't say it would be on-topic. But we don't cease to be well-rounded
human beings with concerns beyond the narrow world of Python programming
just because we are writing on a programming forum.


-- 
Steven



From wuwei23 at gmail.com  Thu Sep 29 23:29:51 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:29:51 -0700 (PDT)
Subject: A Trivial Question
References: <1317246839.73013.YahooMailNeo@web120313.mail.ne1.yahoo.com>
	<mailman.1542.1317247577.27778.python-list@python.org>
Message-ID: <65588c04-eea5-4a7a-b7ba-52dbcded227d@c1g2000yql.googlegroups.com>

On Sep 29, 8:06?am, Chris Rebert <c... at rebertia.com> wrote:
> Try this:
>
> def trial():
> ? ? class Foo(object):
> ? ? ? ? def __init__(self):
> ? ? ? ? ? ? print("Hello, world!")
> ? ? Foo()
> trial()

While this will display "Hello, world!" in the way required, with a
slight adjustment you end up with something potentially a little more
useful:

def trial():
    class Foo(object):
        def __init__(self):
            print("Hello, world!")
    return Foo()

myfoo = trial()

You'll see the same behaviour, but now myfoo refers to the Foo()
object that was created inside trial. This makes trial an object
factory. If you return an uninstantiated Foo instead:

def trial():
    class Foo(object):
        def __init__(self):
            print("Hello, world!")
    return Foo

MyFoo = trial()
foo = MyFoo()

Then trial is a class factory, creating and returning a class.
Factories can be handy if you're wanting to create dynamic classes
based on run time information.

def reader_factory(format='json'):
  class Reader(object):
    def __init__(self, file):
      self.file = file
    if format == 'json':
      def process(self):
        print 'json processing goes here'
    elif format == 'html':
      def process(self):
        print 'html processing goes here'
  return Reader

>>> JSONReader = reader_factory('json')
>>> j = JSONReader('file1')
>>> j.process()
json processing goes here

This is a trivial example which would probably be better handled by
subclasses, but is meant to be indicative of what's possible.


From rosuav at gmail.com  Thu Sep 29 23:41:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 13:41:31 +1000
Subject: Suggested coding style
In-Reply-To: <f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
Message-ID: <CAPTjJmrALWk-KYfKz3uXgewmzb584J4uU=sq_8Uw03bOrWj_Qw@mail.gmail.com>

On Fri, Sep 30, 2011 at 12:50 PM, alex23 <wuwei23 at gmail.com> wrote:
>> GvR should be texting me every night in hopes that some of my API genius will rub
>> off on him.
>
> Are you off your medication again?
>

He's very much like jimontrack (aka Tranzit Jim - google him if you're
curious), whose username people frequently referred to with the t
replaced with a c. Everyone thought he lived in April 1st.

ChrisA


From wuwei23 at gmail.com  Thu Sep 29 23:49:56 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:49:56 -0700 (PDT)
Subject: Off-Topic Posts and Threads on the Python Mailing List
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au> <4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
Message-ID: <5d04e455-3d9f-4727-bbe1-e7e22e3b27a0@i28g2000yqn.googlegroups.com>

Chris Angelico <ros... at gmail.com> wrote:
> We may happen to have coincidental interest in (say)
> music, but just because some group of us (or even all of us) all enjoy
> music does not mean that it'd be on-topic to have a discussion of the
> tetrachord of Mercury.

As general discussion it would be, sure, but I don't think there's
anything that can be readily dismissed as 'not relevant' in terms of
providing abstract concepts to programmers. I've tried explaining
encapsulation to non-programmers using Reason's hardware rack
metaphor. I'm slowly seeing more and more interest in applying
hermeneutics to computer science, a discipline that arose out of the
study of religious texts.

We don't always know what we don't know. For that alone, I'd rather we
were more inclusive of topics of discussion than exclusionary.


From wuwei23 at gmail.com  Thu Sep 29 23:57:56 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 20:57:56 -0700 (PDT)
Subject: Benefit and belief [was Re: Suggested coding style]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJKRaFyQbQ=EVBOE0YoOCmCTEXwh+t7W7f_uthbM-tY=cA@mail.gmail.com>
	<mailman.1555.1317274209.27778.python-list@python.org>
Message-ID: <4ba4842c-9043-4674-a0d5-5beb915e436b@k10g2000vbn.googlegroups.com>

Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> ? ? ? ? Well... We could try for equality in offense -- the Torah or the
> Koran? Maybe the Tripitaka or Sutras?

I always enjoyed the possibly apocryphal claim that the design of VRML
was influenced by the story of Indra's Net. Maybe some religious tomes
are just better? :)


From steve+comp.lang.python at pearwood.info  Fri Sep 30 00:34:26 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 14:34:26 +1000
Subject: Hermeneutics and computer science [was off-topic, now back on]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
	<5d04e455-3d9f-4727-bbe1-e7e22e3b27a0@i28g2000yqn.googlegroups.com>
Message-ID: <4e8546d3$0$29984$c3e8da3$5496439d@news.astraweb.com>

alex23 wrote:

> I'm slowly seeing more and more interest in applying
> a discipline that arose out of the
> study of religious texts.

Tell us more, please.



-- 
Steven



From ian.g.kelly at gmail.com  Fri Sep 30 00:36:29 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 22:36:29 -0600
Subject: Benefit and belief
In-Reply-To: <284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
Message-ID: <CALwzidkxkQYFj6+CYOzw27TG9jWN5md9GYqU7AM=2URuYR=G0w@mail.gmail.com>

On Thu, Sep 29, 2011 at 9:05 PM, alex23 <wuwei23 at gmail.com> wrote:
> Strangely, calling the bible self-contradictory wasn't seen as
> inflammatory...

Well, that part is factual.  Whether that makes it a joke is subjective.


From mickyhulse.lists at gmail.com  Fri Sep 30 00:48:30 2011
From: mickyhulse.lists at gmail.com (Micky Hulse)
Date: Thu, 29 Sep 2011 21:48:30 -0700
Subject: Motion Tracking with Python
In-Reply-To: <4E852694.4080303@simkowiak.net>
References: <4E852694.4080303@simkowiak.net>
Message-ID: <CALri7M=c=F2BUFmWu75tNDfOAvi_XUh7qFpm-prLp=NkpJVYtw@mail.gmail.com>

That's really cool! Thanks for sharing! :)


From ian.g.kelly at gmail.com  Fri Sep 30 00:49:43 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 22:49:43 -0600
Subject: Suggested coding style
In-Reply-To: <1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>
Message-ID: <CALwzidn0GUtsyPA2H0CzLp0YVhSdZgonn8qPRhzE=VSfB4j5UA@mail.gmail.com>

On Thu, Sep 29, 2011 at 5:47 PM, rantingrick <rantingrick at gmail.com> wrote:
> Ah ha! Found the answer!
>
> py> "{0:010d}".format(1234)
> 0000001234
>
> py> "{0:0>10}".format(1234)
> 0000001234
>
> py> "{0:0>10}".format("1234")
> 0000001234
>
> py> "{0:@>10}".format("1234")
> @@@@@@1234
>
> I would skip using the "{int}{repeat}d" syntax and just use the string
> padding since you won't need to worry about the input data type. I
> hate specificity types in string formats. With the old interpolation i
> ALWAYS used %s for everything.

Nope, that doesn't work.

>>> "{0:0>10}".format("-1234")
'00000-1234'

The whole point of zfill is that it handles signs correctly.


From colinphaedrus at yahoo.com  Fri Sep 30 01:02:48 2011
From: colinphaedrus at yahoo.com (crazycga)
Date: Fri, 30 Sep 2011 05:02:48 GMT
Subject: Motion Tracking with Python
References: <mailman.1603.1317355329.27778.python-list@python.org>
Message-ID: <Y3chq.31$kr4.2@newsfe03.iad>

On Thu, 29 Sep 2011 19:16:52 -0700, Derek Simkowiak wrote:

> Hello,
> I have a neat Python project I'd like to share. It does real-time motion
> tracking, using the Python bindings to the OpenCV library:
> 
> http://derek.simkowiak.net/motion-tracking-with-python/
> 
> There is a YouTube video showing the script in action.
> 
> It's especially neat because my daughter and I worked together on this
> project. We used it to track her two pet gerbils, as part of her science
> fair project. She wrote her own (separate) Python script to read the
> motion tracking log files, compute distance and velocity, and then
> export those values in a CSV file. Like I say on the web page: "I?m
> convinced that Python is the best language currently available for
> teaching kids how to program."
> 
> I also use Python professionally, and it's worked out great every time.
> There's no job Python can't handle.
> 
> 
> Thanks,
> Derek Simkowiak
> http://derek.simkowiak.net

That is excessively cool dude!  You've given me some inspiration for my 
own programming as a result!  Thank you!


From ian.g.kelly at gmail.com  Fri Sep 30 01:06:27 2011
From: ian.g.kelly at gmail.com (Ian Kelly)
Date: Thu, 29 Sep 2011 23:06:27 -0600
Subject: Suggested coding style
In-Reply-To: <db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
Message-ID: <CALwzidns6AYNTom4Wf7u9X6q9jQyksdqm5zboQa34EdaB8M0iA@mail.gmail.com>

On Thu, Sep 29, 2011 at 4:56 PM, rantingrick <rantingrick at gmail.com> wrote:
>> Agree that zfill seems to be redundant with str.format, although your
>> suggested syntax is atrocious, especially since a syntax already
>> exists that fits better in the already-complicated format specifier
>> syntax.
>
> It's interesting that you find the format specifier "complicated". I
> will admit that upon first glance i lamented the new format method
> spec and attempted to cling to the old string interpolation crap.
> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)

I find it interesting that a self-proclaimed API expert like yourself
suggests that it isn't complicated.  The documentation on the format
specifiers is around 6 1/2 printed pages long, and that's not even
including the docs for the string.Formatter API.  Devin is right,
though, in that a better word for it would be "dense".

"Complicated" is not a bad thing here, because with that complexity
comes expressiveness.  It just means that care needs to be taken when
adding new options to ensure that they integrate well with the
existing syntax.

> One thing that may help format noobs is to look at the spec as two
> parts; the part before the colon and the part after the colon. If you
> break it down in this manner the meaning starts to shine through. I
> will agree, it is a lot of cryptic info squeezed into a small space
> HOWEVER you would no want a verbose format specification.

What makes you think I'm a "format noob"?  The details may have
evolved over the years, but the format specifiers are fundamentally
still the same old printf syntax that we've all been using for
decades.


From ben+python at benfinney.id.au  Fri Sep 30 01:14:27 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 15:14:27 +1000
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
Message-ID: <8739fe393g.fsf@benfinney.id.au>

alex23 <wuwei23 at gmail.com> writes:

> On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:

> > GvR should be texting me every night in hopes that some of my API
> > genius will rub off on him.
>
> Are you off your medication again?

Please don't make personal attacks. If you don't feel like addressing
the content of his message, don't switch to implying he has a mental
illness.

-- 
 \         ?Pinky, are you pondering what I'm pondering?? ?I think so, |
  `\   Brain, but Tuesday Weld isn't a complete sentence.? ?_Pinky and |
_o__)                                                       The Brain_ |
Ben Finney


From ben+python at benfinney.id.au  Fri Sep 30 01:22:03 2011
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 30 Sep 2011 15:22:03 +1000
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<CABicbJKRaFyQbQ=EVBOE0YoOCmCTEXwh+t7W7f_uthbM-tY=cA@mail.gmail.com>
	<mailman.1555.1317274209.27778.python-list@python.org>
	<4ba4842c-9043-4674-a0d5-5beb915e436b@k10g2000vbn.googlegroups.com>
Message-ID: <87y5x61u6c.fsf@benfinney.id.au>

alex23 <wuwei23 at gmail.com> writes:

> I always enjoyed the possibly apocryphal claim that the design of VRML
> was influenced by the story of Indra's Net.

You see, folks? It's by ?mingling in? other aspects of life with
technical discussion that we can improve the technical discussion :-)

> Maybe some religious tomes are just better? :)

They're all flawed, of course, as is any text. But some are wholly
dreadful while others have parts worth keeping.

-- 
 \         ?Nature hath given men one tongue but two ears, that we may |
  `\          hear from others twice as much as we speak.? ?Epictetus, |
_o__)                                                      _Fragments_ |
Ben Finney


From wuwei23 at gmail.com  Fri Sep 30 01:24:44 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 22:24:44 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<f3c410e7-1cef-4185-a55c-957ec8edcb03@t11g2000yqa.googlegroups.com>
	<8739fe393g.fsf@benfinney.id.au>
Message-ID: <4b295504-3fbe-4d9a-b566-d12afad058c5@dd6g2000vbb.googlegroups.com>

On Sep 30, 3:14?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> alex23 <wuwe... at gmail.com> writes:
> > On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:
> > > GvR should be texting me every night in hopes that some of my API
> > > genius will rub off on him.
>
> > Are you off your medication again?
>
> Please don't make personal attacks. If you don't feel like addressing
> the content of his message, don't switch to implying he has a mental
> illness.

Fair enough. It was intended more as a ludicrous accusation to his
ridiculous claim. Lord knows there's enough in his posts to focus on
without the ad hominems :)


From rosuav at gmail.com  Fri Sep 30 01:31:24 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 15:31:24 +1000
Subject: Motion Tracking with Python
In-Reply-To: <4E852694.4080303@simkowiak.net>
References: <4E852694.4080303@simkowiak.net>
Message-ID: <CAPTjJmoZ7GwhTxC0TzVRBpMGoZcb9aDD0zR4n1NfH1j5zeToNQ@mail.gmail.com>

On Fri, Sep 30, 2011 at 12:16 PM, Derek Simkowiak <derek at simkowiak.net> wrote:
> Like I say on the web page: "I?m convinced that Python is the best language
> currently available for teaching kids how to program."

Agreed.

> There's no job Python can't handle.

Ehhh... Not agreed. Not quite. Yes it's true in that Python is
Turing-complete, but there are a lot of jobs that it can't handle
_well_. (Unless someone's seriously considering porting the Linux
kernel to Python... or writing a device driver in Python... or writing
a MS Word virus in Python...) Right tool for the job! But certainly
Python is excellent at many tasks, and it's easy to work with. I
wholeheartedly support the sentiment behind your statement, even if I
quibble slightly - your statement has accuracy, it merely wants
precision :)

I'll watch your vid once I'm home from work - it promises to be some
pretty cool stuff!

ChrisA


From wuwei23 at gmail.com  Fri Sep 30 01:54:43 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 22:54:43 -0700 (PDT)
Subject: Hermeneutics and computer science [was off-topic, now back on]
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au> <4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
	<5d04e455-3d9f-4727-bbe1-e7e22e3b27a0@i28g2000yqn.googlegroups.com>
	<4e8546d3$0$29984$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <1e8a3553-75fb-45cc-ab71-998a5406fbcd@m37g2000yqc.googlegroups.com>

On Sep 30, 2:34?pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> alex23 wrote:
> > I'm slowly seeing more and more interest in applying
> > a discipline that arose out of the
> > study of religious texts.
>
> Tell us more, please.

Well, it's mostly from real world discussions and may actually be an
artefact of my holding degrees in both philosophy & computer
science :)  But googling "hermeneutics computer science" does bring up
a heap of entries, although the highest ranked is from 1979, so I may
have oversold the idea of it being a growing interest.

Amazon also shows that there have been a number of publications
dealing with this:
http://www.amazon.com/s?ie=UTF8&keywords=Hermeneutics.&rh=n%3A3508%2Ck%3AHermeneutics.

For me, the main aspect of hermeneutics that could apply here - to
programming especially - is the concept that reading a text informs
you for subsequently reinterpreting the text (the "hermeneutic circle"
of Heidegger). No philosophical notion of truth is needed to explain
this, I see much in common with iterative development processes.
Multiplicity of perspective is similarly important in interpretation:
again, computer systems are developed with many user roles and thus
many 'views' of what is happening.

In the interest of fair play, if anyone still smarting at my flippancy
wants to take a swing at my belief system, it's mostly cobbled
together from Nietzsche, Wittgenstein & Crowley. Personal email
preferably, let's keep it off the list unless its particularly witty :)


From thebiggestbangtheory at gmail.com  Fri Sep 30 02:02:55 2011
From: thebiggestbangtheory at gmail.com (bingbang)
Date: Thu, 29 Sep 2011 23:02:55 -0700 (PDT)
Subject: Modifying external running process using python
Message-ID: <086bd803-ddc5-4913-b1f1-5fb6cb5848bb@i28g2000yqn.googlegroups.com>

Hi all,

Beginner here. I am trying to figure out how to modify a running
process on a linux system using Python.

Example: I have a python program that takes in as an argument a PID.
My goal is to use this PID and get info about the running process with
that PID. (1) Find where it is located in memory (2) Where is the
instruction pointer (3) Modify the program such that the next executed
instruction is something else (4) Return the pointer back to the next
legitimate instruction (5) Let the original process execute as it
should have

I am trying to develop a POC to show how a small piece of code can be
injected into a running process to just print 'hello' to stdout and
not disturb the rest of the process. Before you tear you hair out. The
program I want to "infect" will be an infinite loop with a sleep in it
and the "malware" will be a " print 'infected' " kind of program. Not
looking to do anything malicious, just trying to learn.

I looked up trace and some other modules but they all seem to do with
following the currently executing python process. Also looked at
pyhook, but its mainly to trap signals from keyboards etc.. Looked at
gray hat python - tuned towards windows.

Can anyone please point me to some modules that might be useful, or
some code samples. I tried googling for "python inspect process PID"
etc.. did not get anything very useful. I know I can run gdb -a pid
from within python and such but I am looking for a non os.popen ish
kind of a way. Is there a module that will be helpful.

Let's assume I have sudo/root privileges and that the POC code "only
needs to work in linux".

Any help is very appreciated.
[Also posted on StackOverflow] - no real good leads from there

Thanks!


From anikom15 at gmail.com  Fri Sep 30 02:14:21 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Thu, 29 Sep 2011 23:14:21 -0700
Subject: Suggested coding style
In-Reply-To: <CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
Message-ID: <20110930061421.GA12929@Smoke>

On Thu, Sep 29, 2011 at 07:07:28PM -0400, Devin Jeanpierre wrote:
> > However, as you use the new format method you will come to appreciate
> > it. It's an adult beverage with an acquired taste. ;-)
> 
> Yeah. It's a much more difficult to read thing, but once you learn how
> to write it it flows faster.
> 
> Of course, I never managed to learn how to write it...
> 
> I would suggest that rather than being "complicated" it is "dense".
> 
I'm one of the weirdos who is absolutely hostile to the format method
and continues to use % formatting.  I'm pretty sure it is because of my
C background (actually I learned Python before C, and thus learned %
formatting in Python).  However, I'm not so opposed to it that I've not
learned it.  It is quite "dense", almost feels like something in a
scripting language like Perl.  Indeed, I did try it for some time, but
it was just too "heavy" and slow for me.  Well someday I'll probably be
forced to use it, but for anyone else who agrees with me, always know
there's at least one Python programmer out there with some (or no)
sense.


From wuwei23 at gmail.com  Fri Sep 30 02:31:50 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 23:31:50 -0700 (PDT)
Subject: Motion Tracking with Python
References: <mailman.1603.1317355329.27778.python-list@python.org>
Message-ID: <75e59668-9002-4614-9fe8-9605e6ecf924@dm9g2000vbb.googlegroups.com>

On Sep 30, 12:16?pm, Derek Simkowiak <de... at simkowiak.net> wrote:
> It's especially neat because my daughter and I worked together on this
> project. We used it to track her two pet gerbils, as part of her science
> fair project. She wrote her own (separate) Python script to read the
> motion tracking log files, compute distance and velocity, and then
> export those values in a CSV file.

Thank you for sharing this. My daughter is only 20 months at the
moment but I definitely hope to teach her coding as she gets older.

Cheers.


From rosuav at gmail.com  Fri Sep 30 02:35:02 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 16:35:02 +1000
Subject: Suggested coding style
In-Reply-To: <20110930061421.GA12929@Smoke>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<20110930061421.GA12929@Smoke>
Message-ID: <CAPTjJmoNF0Vw0KuECyaTR72_TC_FednvEkzw80-35cT7_SatLg@mail.gmail.com>

On Fri, Sep 30, 2011 at 4:14 PM, Westley Mart?nez <anikom15 at gmail.com> wrote:
> I'm one of the weirdos who is absolutely hostile to the format method
> and continues to use % formatting. ?I'm pretty sure it is because of my
> C background (actually I learned Python before C, and thus learned %
> formatting in Python).

I quite like printf-style formatting. It's well known, well defined,
and compact. When I write C++ programs, I often still use
printf/sprintf extensively - it just "feels nicer" than iostream (and
the main downside of printf, the lack of argument checking, is largely
solved in recent gcc). So when I work with Python, it makes sense to
use the same thing there. Dense syntax results in easy-to-read format
strings, imho.

ChrisA


From wuwei23 at gmail.com  Fri Sep 30 02:39:29 2011
From: wuwei23 at gmail.com (alex23)
Date: Thu, 29 Sep 2011 23:39:29 -0700 (PDT)
Subject: Motion Tracking with Python
References: <4E852694.4080303@simkowiak.net>
	<mailman.1608.1317360687.27778.python-list@python.org>
Message-ID: <a3946135-6f74-4b32-862b-8ca0410f3c15@18g2000yqz.googlegroups.com>

On Sep 30, 3:31?pm, Chris Angelico <ros... at gmail.com> wrote:
> Unless someone's seriously considering porting the Linux
> kernel to Python...

Well, they've certainly asked:
http://bytes.com/topic/python/answers/37048-reimplenting-linux-kernel-python

And while not Linux kernels, there are two projects attempting to
develop Python-implemented OSes:
http://code.google.com/p/cleese/
http://unununium.org

> or writing a device driver in Python...

http://www.stealth-x.com/programming/driver-writing-with-python.php

> or writing a MS Word virus in Python...

Now that's just crazy talk.


From subhagurgaon2011 at gmail.com  Fri Sep 30 02:43:13 2011
From: subhagurgaon2011 at gmail.com (Subhabrata Banerjee)
Date: Thu, 29 Sep 2011 23:43:13 -0700 (PDT)
Subject: Question on Manipulating List and on Python
References: <a6679459-fc57-4389-8d43-1e5ed960d85d@y18g2000yqy.googlegroups.com>
	<j626a5$5he$1@reader1.panix.com>
	<71c71a9d-928d-4ebe-af64-674c31bc1c09@e9g2000vby.googlegroups.com>
	<CAPTjJmp07mUQfSd1Teh5vqCsOseiSj2Hg=yH=m2HSP-jHe80-Q@mail.gmail.com>
	<mailman.1586.1317326003.27778.python-list@python.org>
Message-ID: <f68e3dda-4666-4bce-8e08-f263c4fd4079@z19g2000vby.googlegroups.com>

On Sep 30, 12:52?am, "Prasad, Ramit" <ramit.pra... at jpmorgan.com>
wrote:
> -----Original Message-----
> From: python-list-bounces+ramit.prasad=jpmorgan.... at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.... at python.org] On Behalf Of Chris Angelico
> Sent: Thursday, September 29, 2011 11:51 AM
> To: python-l... at python.org
> Subject: Re: Question on Manipulating List and on Python
>
> On Fri, Sep 30, 2011 at 2:36 AM, Subhabrata Banerjee
> <subhagurgaon2... at gmail.com> wrote:
> > And Python seems faster than C++/Java. It is indeed. I also experience
> > it.
>
> Python compared to Java? Difficult to compare. Python to C++?
> Impossible to compare. But performance depends MASSIVELY on
> algorithmic quality; if you code the exact same thing in Python and in
> C++, you would probably find that the C++ one is faster, but chances
> are you're implementing approximately the same thing in two quite
> different ways. Or possibly you're using a slow and inefficient
> library or third-party function.
>
> I've sometimes written code in one language and directly ported it to
> another, and then run both on the same hardware. With most such
> experiments, CPython generally doesn't perform all that well, and C or
> C++ rocks. But frequently, the C/C++ code is more verbose and more
> error-prone than the Python - because Python's biggest boast is not
> that it's fast, but that it's *fast enough*, while being easy to work
> with. (And every once in a while there's something where I want to use
> a pointer to some other variable, and that's a concept that just plain
> doesn't work in Python. You have references to objects, but you can't
> from one place change another variable, without using some kind of
> mutable object that they both reference.)
> -----------------------------------------------------------------------
>
> I think Steven D'Aprano had an excellent post on this a week or so ago (on the tutor list, not this one).
>
> See:http://mail.python.org/pipermail/tutor/2011-September/085573.html
>
> Ramit
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
> ChrisA
> --http://mail.python.org/mailman/listinfo/python-list
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available athttp://www.jpmorgan.com/pages/disclosures/email. ?
>
>

Dear Group,
Thanks for your suggestions. I'll check if these work. Converting to
dictionary I was thinking but others I have to test. Without patting
my own back(I do not write algorithms that good), I can say Python is
indeed damn fast. A reason many of my friends are shifting fast to
Python and I was suggested by a reputed person of MIT CogLab to use
Python instead of C++ and it worked just fabulous for me. To my
collegue I would find out an answer.
Regards,
Subhabrata.


From rustompmody at gmail.com  Fri Sep 30 03:24:30 2011
From: rustompmody at gmail.com (rusi)
Date: Fri, 30 Sep 2011 00:24:30 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
Message-ID: <73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>

On Sep 30, 4:03?am, Devin Jeanpierre <jeanpierr... at gmail.com> wrote:
>
> But anyway, no, we don't agree on what it means to be friendly or what
> a hostile atmosphere is. I've noticed that people tend to be a lot
> harsher here than what I'm used to, so perhaps your attitude to it is
> more common on mailing-lists and I should just adapt.

A Mulla Nasruddin story comes to mind:
The judge in a village court had gone on vacation. Nasrudin was asked
to be temporary judge for a day. Mulla sat on the Judge's chair and
ordered the first case to be brought up for hearing.

"You are right," said Nasrudin after carefully hearing one side.
"You are right," he said after carefully hearing the other side.
"But both cannot be right!" said the court clerk bewildered.
After profound thought said the Mulla:

  "You are right"


From rosuav at gmail.com  Fri Sep 30 03:52:42 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 17:52:42 +1000
Subject: Benefit and belief
In-Reply-To: <73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
	<73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>
Message-ID: <CAPTjJmq=h5Cwe4tTYaumNOGp8EcQF_nKOgP81FfUjz5OCbLd9g@mail.gmail.com>

On Fri, Sep 30, 2011 at 5:24 PM, rusi <rustompmody at gmail.com> wrote:
> "You are right," said Nasrudin after carefully hearing one side.
> "You are right," he said after carefully hearing the other side.
> "But both cannot be right!" said the court clerk bewildered.
> After profound thought said the Mulla:
>
> ?"You are right"
>

And I am right, and you are right, and all is right as right can be!
-- Pish-Tush, a Japanese nobleman in service of /The Mikado/

Chris Angelico


From rosuav at gmail.com  Fri Sep 30 03:57:12 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 17:57:12 +1000
Subject: Motion Tracking with Python
In-Reply-To: <a3946135-6f74-4b32-862b-8ca0410f3c15@18g2000yqz.googlegroups.com>
References: <4E852694.4080303@simkowiak.net>
	<mailman.1608.1317360687.27778.python-list@python.org>
	<a3946135-6f74-4b32-862b-8ca0410f3c15@18g2000yqz.googlegroups.com>
Message-ID: <CAPTjJmrtqhGt55o0dYFGA26E2t_ri5AvzVjs+aswDX_AA1admA@mail.gmail.com>

On Fri, Sep 30, 2011 at 4:39 PM, alex23 <wuwei23 at gmail.com> wrote:
>> or writing a MS Word virus in Python...
>
> Now that's just crazy talk.
>

... and I thought all three were. You know what they say - truth is
stranger than fiction, because fiction has to make sense!

Although the device driver example you cite is still ring-3 code, and
the Linux kernel is still in C. I like the idea of a special OS
written in Python though; it wouldn't be Linux, but it could well be
an excellent embedded-device OS. It'd probably end up having to
reinvent all sorts of facilities like process isolation and such,
though.

ChrisA


From ovidiudeac at gmail.com  Fri Sep 30 05:10:48 2011
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 30 Sep 2011 12:10:48 +0300
Subject: regexp compilation error
Message-ID: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>

I have the following regexp which fails to compile. Can somebody explain why?

>>> re.compile(r"""^(?: [^y]* )*""", re.X)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/re.py", line 190, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python2.6/re.py", line 245, in _compile
    raise error, v # invalid expression
sre_constants.error: nothing to repeat

Is this a bug or a feature?

Thanks,
Ovidiu


From moky.math at gmail.com  Fri Sep 30 05:13:14 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Fri, 30 Sep 2011 11:13:14 +0200
Subject: Counting the number of call of a function
In-Reply-To: <mailman.1577.1317317181.27778.python-list@python.org>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
	<mailman.1577.1317317181.27778.python-list@python.org>
Message-ID: <4E85882A.6010602@gmail.com>


> The keys of globals() are the _names_. You're giving it the function
> itself.

Ow, ok. I didn't caught it. I understand now.

  > A decorator would be better.

Yes. I keep the solution with
foo=Wraper(foo)

Thanks a lot all !
Laurent



From moky.math at gmail.com  Fri Sep 30 05:13:14 2011
From: moky.math at gmail.com (Laurent Claessens)
Date: Fri, 30 Sep 2011 11:13:14 +0200
Subject: Counting the number of call of a function
In-Reply-To: <mailman.1577.1317317181.27778.python-list@python.org>
References: <j628n2$vmq$1@news.univ-fcomte.fr>
	<mailman.1577.1317317181.27778.python-list@python.org>
Message-ID: <4E85882A.6010602@gmail.com>


> The keys of globals() are the _names_. You're giving it the function
> itself.

Ow, ok. I didn't caught it. I understand now.

  > A decorator would be better.

Yes. I keep the solution with
foo=Wraper(foo)

Thanks a lot all !
Laurent



From rosuav at gmail.com  Fri Sep 30 05:18:43 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 19:18:43 +1000
Subject: regexp compilation error
In-Reply-To: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
Message-ID: <CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>

On Fri, Sep 30, 2011 at 7:10 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
> I have the following regexp which fails to compile. Can somebody explain why?
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "/usr/lib/python2.6/re.py", line 190, in compile
> ? ?return _compile(pattern, flags)
> ?File "/usr/lib/python2.6/re.py", line 245, in _compile
> ? ?raise error, v # invalid expression
> sre_constants.error: nothing to repeat
>
> Is this a bug or a feature?

What version of Python are you using? It looks like you're running in
a Python 3 interpreter, and loading a Python 2 module (as shown by the
python2.6 in the path and the Python 2 error-raise syntax). You may
have a problem with your module path.

Running that line of code in Python 3.2 for Windows produces this error:

>>> re.compile(r"""^(?: [^y]* )*""", re.X)
Traceback (most recent call last):
  File "<pyshell#465>", line 1, in <module>
    re.compile(r"""^(?: [^y]* )*""", re.X)
  File "C:\Python32\lib\re.py", line 206, in compile
    return _compile(pattern, flags)
  File "C:\Python32\lib\re.py", line 256, in _compile
    return _compile_typed(type(pattern), pattern, flags)
  File "C:\Python32\lib\functools.py", line 180, in wrapper
    result = user_function(*args, **kwds)
  File "C:\Python32\lib\re.py", line 268, in _compile_typed
    return sre_compile.compile(pattern, flags)
  File "C:\Python32\lib\sre_compile.py", line 495, in compile
    code = _code(p, flags)
  File "C:\Python32\lib\sre_compile.py", line 480, in _code
    _compile(code, p.data, flags)
  File "C:\Python32\lib\sre_compile.py", line 74, in _compile
    elif _simple(av) and op is not REPEAT:
  File "C:\Python32\lib\sre_compile.py", line 359, in _simple
    raise error("nothing to repeat")
sre_constants.error: nothing to repeat

Does that help at all?

ChrisA


From ovidiudeac at gmail.com  Fri Sep 30 05:26:52 2011
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 30 Sep 2011 12:26:52 +0300
Subject: regexp compilation error
In-Reply-To: <CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
Message-ID: <CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>

$ python --version
Python 2.6.6


On Fri, Sep 30, 2011 at 12:18 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 7:10 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
>> I have the following regexp which fails to compile. Can somebody explain why?
>>
>>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
>> Traceback (most recent call last):
>> ?File "<stdin>", line 1, in <module>
>> ?File "/usr/lib/python2.6/re.py", line 190, in compile
>> ? ?return _compile(pattern, flags)
>> ?File "/usr/lib/python2.6/re.py", line 245, in _compile
>> ? ?raise error, v # invalid expression
>> sre_constants.error: nothing to repeat
>>
>> Is this a bug or a feature?
>
> What version of Python are you using? It looks like you're running in
> a Python 3 interpreter, and loading a Python 2 module (as shown by the
> python2.6 in the path and the Python 2 error-raise syntax). You may
> have a problem with your module path.
>
> Running that line of code in Python 3.2 for Windows produces this error:
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
> ?File "<pyshell#465>", line 1, in <module>
> ? ?re.compile(r"""^(?: [^y]* )*""", re.X)
> ?File "C:\Python32\lib\re.py", line 206, in compile
> ? ?return _compile(pattern, flags)
> ?File "C:\Python32\lib\re.py", line 256, in _compile
> ? ?return _compile_typed(type(pattern), pattern, flags)
> ?File "C:\Python32\lib\functools.py", line 180, in wrapper
> ? ?result = user_function(*args, **kwds)
> ?File "C:\Python32\lib\re.py", line 268, in _compile_typed
> ? ?return sre_compile.compile(pattern, flags)
> ?File "C:\Python32\lib\sre_compile.py", line 495, in compile
> ? ?code = _code(p, flags)
> ?File "C:\Python32\lib\sre_compile.py", line 480, in _code
> ? ?_compile(code, p.data, flags)
> ?File "C:\Python32\lib\sre_compile.py", line 74, in _compile
> ? ?elif _simple(av) and op is not REPEAT:
> ?File "C:\Python32\lib\sre_compile.py", line 359, in _simple
> ? ?raise error("nothing to repeat")
> sre_constants.error: nothing to repeat
>
> Does that help at all?
>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rosuav at gmail.com  Fri Sep 30 05:29:50 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Fri, 30 Sep 2011 19:29:50 +1000
Subject: regexp compilation error
In-Reply-To: <CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
Message-ID: <CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>

On Fri, Sep 30, 2011 at 7:26 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
> $ python --version
> Python 2.6.6

Ah, I think I was misinterpreting the traceback. You do actually have
a useful message there; it's the same error that my Py3.2 produced:

sre_constants.error: nothing to repeat

I'm not sure what your regex is trying to do, but the problem seems to
be connected with the * at the end of the pattern.

ChrisA


From 1248283536 at qq.com  Fri Sep 30 05:35:37 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Fri, 30 Sep 2011 17:35:37 +0800
Subject: =?gbk?B?u9i4tKO6IGhvdyB0byBydW4gaW4geHA/?=
Message-ID: <tencent_1A00B2D755E0E2994EFC8D6D@qq.com>

the command :
2to3-3.2 getcode3.py -w
can run in linux
it can't run in window xp,can i make it in window xp?
 
 
------------------ ???? ------------------
???: "1248283536"<1248283536 at qq.com>;
????: 2011?9?28?(???) ??7:50
???: "Peter Otten"<__peter__ at web.de>; "python-list"<python-list at python.org>; 

??: Re: how to run in xp?

 

 it can run ,but there is still a problem ,nothing in my file.
please run the code in xp+python32
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    url='http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    print (file)
what you get is:

>>> 
b''
b''
b''
>>> 

how to fix it?
------------------ Original ------------------
From:  "Peter Otten"<__peter__ at web.de>;
Date:  Wed, Sep 28, 2011 04:04 PM
To:  "python-list"<python-list at python.org>; 

Subject:  Re: how to run in xp?

 
=?gbk?B?ytjW6rT9zcM=?= wrote:

> #coding:utf-8
> import urllib
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies- \ 
>     by-industry.aspx?exchange='+down+'&render=download'
>     file=urllib.urlopen(url).read() myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> it can run in ubuntu+python2.6 ,when it run in window xp+python32,the
> output is Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 8, in <module>
>     file=urllib.urlopen(url).read()
> AttributeError: 'module' object has no attribute 'urlopen'
> 
> i change it into:
> #coding:utf-8
> import urllib.request
> exchange=['NASDAQ','NYSE','AMEX']
> for down in exchange:
>     myfile=open('./'+down,'w')
>     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
>     file=urllib.request.urlopen(url).read()
>     myfile.write(file)
>     print ('ok',down)
>     myfile.close()
> 
> the output is :
> Traceback (most recent call last):
>   File "C:\Python32\getcode.py", line 9, in <module>
>     myfile.write(file)
> TypeError: must be str, not bytes
> 
> how to make it run in xp+python32?

The problem here is the switch from Python 2 to 3. Python 3 has some 
backwards-incompatible Syntax changes along with changes to classes and 
library organisation. The good news is that there's a tool, 2to3, that can 
handle most of these changes:

$ cat getcode.py
#coding:utf-8   
import urllib   
exchange=['NASDAQ','NYSE','AMEX'] 
for down in exchange:             
    myfile=open('./'+down,'wb')   
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download' 
    file=urllib.urlopen(url).read()                                                                    
    myfile.write(file)                                                                                 
    print 'ok', down
    myfile.close()
$ cp getcode.py getcode3.py
$ 2to3-3.2 getcode3.py -w
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
RefactoringTool: Refactored getcode3.py
--- getcode3.py (original)
+++ getcode3.py (refactored)
@@ -1,10 +1,10 @@
 #coding:utf-8
-import urllib
+import urllib.request, urllib.parse, urllib.error
 exchange=['NASDAQ','NYSE','AMEX']
 for down in exchange:
     myfile=open('./'+down,'wb')
     url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
-    file=urllib.urlopen(url).read()
+    file=urllib.request.urlopen(url).read()
     myfile.write(file)
-    print 'ok', down
+    print('ok', down)
     myfile.close()
RefactoringTool: Files that were modified:
RefactoringTool: getcode3.py
$ cat getcode3.py
#coding:utf-8
import urllib.request, urllib.parse, urllib.error
exchange=['NASDAQ','NYSE','AMEX']
for down in exchange:
    myfile=open('./'+down,'wb')
    url='http://www.nasdaq.com/screening/companies-by-
industry.aspx?exchange='+down+'&render=download'
    file=urllib.request.urlopen(url).read()
    myfile.write(file)
    print('ok', down)
    myfile.close()
$ python3.2 getcode3.py
ok NASDAQ
ok NYSE
ok AMEX


-- 
http://mail.python.org/mailman/listinfo/python-list
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From ovidiudeac at gmail.com  Fri Sep 30 05:57:25 2011
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 30 Sep 2011 12:57:25 +0300
Subject: regexp compilation error
In-Reply-To: <CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
	<CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
Message-ID: <CAKVsE7teYVhts07Nj4jWWcv-XS4fv92wqgGfB7Dg86nNXBSNFA@mail.gmail.com>

This is only part of a regex taken from an old perl application which
we are trying to understand/port to our new Python implementation.

The original regex was considerably more complex and it didn't compile
in python so I removed all the parts I could in order to isolate the
problem such that I can ask help here.

So the problem is that this regex doesn't compile. On the other hand
I'm not really sure it should. It's an anchor on which you apply *.
I'm not sure if this is legal.

On the other hand if I remove one of the * it compiles.

>>> re.compile(r"""^(?: [^y]* )*""", re.X)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/re.py", line 190, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python2.6/re.py", line 245, in _compile
    raise error, v # invalid expression
sre_constants.error: nothing to repeat
>>> re.compile(r"""^(?: [^y] )*""", re.X)
<_sre.SRE_Pattern object at 0x7f4069cc36b0>
>>> re.compile(r"""^(?: [^y]* )""", re.X)
<_sre.SRE_Pattern object at 0x7f4069cc3730>

Is this a bug in python regex engine? Or maybe some incompatibility with Perl?

On Fri, Sep 30, 2011 at 12:29 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 7:26 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
>> $ python --version
>> Python 2.6.6
>
> Ah, I think I was misinterpreting the traceback. You do actually have
> a useful message there; it's the same error that my Py3.2 produced:
>
> sre_constants.error: nothing to repeat
>
> I'm not sure what your regex is trying to do, but the problem seems to
> be connected with the * at the end of the pattern.
>
> ChrisA
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve+comp.lang.python at pearwood.info  Fri Sep 30 08:06:43 2011
From: steve+comp.lang.python at pearwood.info (Steven D'Aprano)
Date: Fri, 30 Sep 2011 22:06:43 +1000
Subject: regexp compilation error
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
	<CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
	<mailman.1619.1317376649.27778.python-list@python.org>
Message-ID: <4e85b0d3$0$29975$c3e8da3$5496439d@news.astraweb.com>

Ovidiu Deac wrote:

>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.6/re.py", line 190, in compile
>     return _compile(pattern, flags)
>   File "/usr/lib/python2.6/re.py", line 245, in _compile
>     raise error, v # invalid expression
> sre_constants.error: nothing to repeat
>>>> re.compile(r"""^(?: [^y] )*""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc36b0>
>>>> re.compile(r"""^(?: [^y]* )""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc3730>
> 
> Is this a bug in python regex engine? Or maybe some incompatibility with
> Perl?

Before asking whether it is a bug, perhaps you should consider what (if
anything) that regex is supposed to actually do.

Perhaps you should post the Perl equivalent, and some examples of it in use.


-- 
Steven



From hansmu at xs4all.nl  Fri Sep 30 08:12:12 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Fri, 30 Sep 2011 14:12:12 +0200
Subject: regexp compilation error
In-Reply-To: <mailman.1613.1317373851.27778.python-list@python.org>
References: <mailman.1613.1317373851.27778.python-list@python.org>
Message-ID: <4e85b21c$0$2444$e4fe514c@news2.news.xs4all.nl>

On 30/09/11 11:10:48, Ovidiu Deac wrote:
> I have the following regexp which fails to compile. Can somebody explain why?
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
[...]
> sre_constants.error: nothing to repeat
>
> Is this a bug or a feature?

A feature: the message explains why this pattern is not allowed.

The sub-pattern (?: [^y]* ) matches zero or more non-'y's, so
it potentially matches the empty string.  It you were allowed
to apply '*' to such a sub-pattern, the matcher could go into
an infinite loop, finding billions of matching empty strings,
one after the other.

I'm not sure what you are trying to match, but for zero-or-more
not-'y's, you could write r"^[^y]*".  This is guaranteed to
always match, since there are always at least zero of them.

You might as well write r"^", that is also guaranteed to
always match.

What are you trying to achieve?

-- HansM




From neilc at norwich.edu  Fri Sep 30 08:15:33 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 30 Sep 2011 12:15:33 GMT
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
	<73379d6f-7a22-4906-874c-0d87a861a4b8@j10g2000vbb.googlegroups.com>
	<mailman.1611.1317369165.27778.python-list@python.org>
Message-ID: <9elq75Fh5cU1@mid.individual.net>

On 2011-09-30, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 5:24 PM, rusi <rustompmody at gmail.com> wrote:
>> "You are right," said Nasrudin after carefully hearing one side.
>> "You are right," he said after carefully hearing the other side.
>> "But both cannot be right!" said the court clerk bewildered.
>> After profound thought said the Mulla:
>>
>> ?"You are right"
>>
>
> And I am right, and you are right, and all is right as right can be!
> -- Pish-Tush, a Japanese nobleman in service of /The Mikado/

Never has being right, proper and correct been so thoroughly
celebrated. Except perhaps when my C++ program compiles without
warnings. That's pretty good, too.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From 1248283536 at qq.com  Fri Sep 30 08:36:57 2011
From: 1248283536 at qq.com (=?gbk?B?ytjW6rT9zcM=?=)
Date: Fri, 30 Sep 2011 20:36:57 +0800
Subject: parse  xml
Message-ID: <tencent_3FDC10142817A6FA2A1CD410@qq.com>

please click the 
http://www.secinfo.com/d14qfp.q9j.htm
then ,click  the following:
44: XML   IDEA: Condensed Consolidating Statements of Income   XML   5.11M   (Details)--R158 
there is the  citigroup's annual financial report --statements of income,xml file.

how can i get a  table of  statements of income  in python ?
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From jeanpierreda at gmail.com  Fri Sep 30 08:40:33 2011
From: jeanpierreda at gmail.com (Devin Jeanpierre)
Date: Fri, 30 Sep 2011 08:40:33 -0400
Subject: [OT] Benefit and belief
In-Reply-To: <4e853310$0$29996$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<mailman.1595.1317337447.27778.python-list@python.org>
	<4e853310$0$29996$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <CABicbJL1xFdrX3qhWHxmRDa6JXs9K-0HJt8PZ1DhrPy6RbVODw@mail.gmail.com>

> If you are more upset at my describing the Catholic Church as protecting
> child molesters than you are at the Church for actually protecting child
> molesters

I'm not, and your rhetoric is ridiculous.

Devin

On Thu, Sep 29, 2011 at 11:10 PM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> Devin Jeanpierre wrote:
>
>> I also didn't reprimand anyone, except maybe Steven.
>
> If you are more upset at my describing the Catholic Church as protecting
> child molesters than you are at the Church for actually protecting child
> molesters, then your priorities are completely screwed up and your
> reprimand means less than nothing to me. I wear it as a badge of honour.
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From rantingrick at gmail.com  Fri Sep 30 09:54:25 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 06:54:25 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
Message-ID: <27620bc4-edd2-473e-809f-18f17b426b4f@db5g2000vbb.googlegroups.com>

Note: I am quoting "Passiday" to get this thread back on subject
however my reply is for "alex23" the philosopher"

On Sep 29, 9:50?pm, alex23 <wuwe... at gmail.com> wrote:
> On Sep 29, 10:23?pm, rantingrick <rantingr... at gmail.com> wrote:
>
> > What is so bad about breaking code in obscure places?
>
> Try coding in PHP across minor release versions and see how you feel
> about deprecating core functions on a whim.

I never said we should remove it now, i said we should deprecate it
now.

> > We changed print
> > to a function which broke just about every piece of code every written
> > in this language.
>
> In a well declared _break_ with backwards compatibility. Not on a whim
> between minor releases.

Please Google deprecate.

> > What is so bad then about breaking some very obscure code?
>
> Because while you say "some very obscure code", what you really mean
> is "code that isn't mine".

Well "alex" i can't see a mob approaching with pitchforks because we
deprecate a misplaced and rarely used functionality of the stdlib.

> As you have no access
> to the inner states of _any_ of the people you regularly condemn here
> with your hypocritical attacks, I've no idea why you consider yourself
> to be an expert on their desires and opinions.

Well "alex", like yourself, i hold expertise in many fields BESIDES
programming. One of which being psychology.


From vlastimil.brom at gmail.com  Fri Sep 30 09:56:20 2011
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 30 Sep 2011 15:56:20 +0200
Subject: regexp compilation error
In-Reply-To: <CAKVsE7teYVhts07Nj4jWWcv-XS4fv92wqgGfB7Dg86nNXBSNFA@mail.gmail.com>
References: <CAKVsE7vOkE-4FK3y1KFrsFNi0mk=S5jT6iuv0pzC4bvEe12kwg@mail.gmail.com>
	<CAPTjJmrn_iWimNRRt8qOeey2NUV18TmDM+X2o1SvjNELgk8sDg@mail.gmail.com>
	<CAKVsE7twuX0FLOxOiHTpF2qu5Zj42XVQGAJHsBuKHHVuYKqoJw@mail.gmail.com>
	<CAPTjJmo_5Yb=eBC=iDEDQHvSFJF8HDkDQ-dpQTD7e2Q1hE235g@mail.gmail.com>
	<CAKVsE7teYVhts07Nj4jWWcv-XS4fv92wqgGfB7Dg86nNXBSNFA@mail.gmail.com>
Message-ID: <CAHzaPEMVfBjWjh9FxOtatpONBguYjMnceipSTZuSi3za2-gu=w@mail.gmail.com>

2011/9/30 Ovidiu Deac <ovidiudeac at gmail.com>:
> This is only part of a regex taken from an old perl application which
> we are trying to understand/port to our new Python implementation.
>
> The original regex was considerably more complex and it didn't compile
> in python so I removed all the parts I could in order to isolate the
> problem such that I can ask help here.
>
> So the problem is that this regex doesn't compile. On the other hand
> I'm not really sure it should. It's an anchor on which you apply *.
> I'm not sure if this is legal.
>
> On the other hand if I remove one of the * it compiles.
>
>>>> re.compile(r"""^(?: [^y]* )*""", re.X)
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "/usr/lib/python2.6/re.py", line 190, in compile
> ? ?return _compile(pattern, flags)
> ?File "/usr/lib/python2.6/re.py", line 245, in _compile
> ? ?raise error, v # invalid expression
> sre_constants.error: nothing to repeat
>>>> re.compile(r"""^(?: [^y] )*""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc36b0>
>>>> re.compile(r"""^(?: [^y]* )""", re.X)
> <_sre.SRE_Pattern object at 0x7f4069cc3730>
>
> Is this a bug in python regex engine? Or maybe some incompatibility with Perl?
>
> On Fri, Sep 30, 2011 at 12:29 PM, Chris Angelico <rosuav at gmail.com> wrote:
>> On Fri, Sep 30, 2011 at 7:26 PM, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
>>> $ python --version
>>> Python 2.6.6
>>
>> Ah, I think I was misinterpreting the traceback. You do actually have
>> a useful message there; it's the same error that my Py3.2 produced:
>>
>> sre_constants.error: nothing to repeat
>>
>> I'm not sure what your regex is trying to do, but the problem seems to
>> be connected with the * at the end of the pattern.
>>
>> ChrisA
>> --

I believe, this is a limitation of the builtin re engine concerning
nested infinite quantifiers - (...*)*  - in your pattern.
You can try a more powerful recent regex implementation, which appears
to handle it:

http://pypi.python.org/pypi/regex

using the VERBOSE flag - re.X all (unescaped) whitespace outside of
character classes is ignored,
http://docs.python.org/library/re.html#re.VERBOSE
the pattern should be equivalent to:
r"^(?:[^y]*)*"
ie. you are not actually gaining anything with double quantifier, as
there isn't anything "real" in the pattern outside [^y]*

It appears, that you have oversimplified the pattern (if it had worked
in the original app),
however, you may simply try with
import regex as re
and see, if it helps.

Cf:
>>>
>>> regex.findall(r"""^(?: [^y]* )*""", "a bcd e", re.X)
['a bcd e']
>>> re.findall(r"""^(?: [^y]* )*""", "a bcd e", re.X)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "re.pyc", line 177, in findall
  File "re.pyc", line 244, in _compile
error: nothing to repeat
>>>
>>> re.findall(r"^(?:[^y]*)*", "a bcd e")
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "re.pyc", line 177, in findall
  File "re.pyc", line 244, in _compile
error: nothing to repeat
>>> regex.findall(r"^(?:[^y]*)*", "a bcd e")
['a bcd e']
>>> regex.findall(r"^[^y]*", "a bcd e")
['a bcd e']
>>>


hth,
  vbr


From devplayer at gmail.com  Fri Sep 30 09:57:17 2011
From: devplayer at gmail.com (DevPlayer)
Date: Fri, 30 Sep 2011 06:57:17 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<mailman.1566.1317305041.27778.python-list@python.org>
	<87mxdn2fwl.fsf@benfinney.id.au>
Message-ID: <60c608a5-5f56-4949-806f-f68ff2510fb0@j1g2000yqj.googlegroups.com>

from attitude import humour

Funny. url link to gif. Funny. Youtube video. Funny.

True Pythonees do not speak in English they speak in Python.

Shame, this discussion will be sent to the Pearly gates or the Flaming
Iron Bars in 5 days. Well, not so much a shame.



From rantingrick at gmail.com  Fri Sep 30 09:58:36 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 06:58:36 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
Message-ID: <6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>

On Sep 29, 10:05?pm, alex23 <wuwe... at gmail.com> wrote:
> On Sep 30, 9:37?am, MRAB <pyt... at mrabarnett.plus.com> wrote:

> > alex23:
> > """And like the Bible, the Zen was created by humans as a joke. If you're
> > taking it too seriously, that's your problem."""
>
> Strangely, calling the bible self-contradictory wasn't seen as
> inflammatory...

For the same reason that telling the truth is not slander. The fact is
that the Bible IS contradictory with itself. However, your opinion
unlike my facts, were full of vile hatred. Nice try attempting to
shift the mob against me.





From rick.mansilla at gmail.com  Fri Sep 30 10:06:42 2011
From: rick.mansilla at gmail.com (Ricardo Mansilla)
Date: Fri, 30 Sep 2011 09:06:42 -0500
Subject: Motion Tracking with Python
In-Reply-To: <4E852694.4080303@simkowiak.net>
References: <4E852694.4080303@simkowiak.net>
Message-ID: <201109300906.43128.rick.mansilla@gmail.com>

On Thursday 29 September 2011 21:16:52 you wrote:
> Hello,
> I have a neat Python project I'd like to share. It does real-time motion
> tracking, using the Python bindings to the OpenCV library:
> 
> http://derek.simkowiak.net/motion-tracking-with-python/
> 
> There is a YouTube video showing the script in action.
> 
> It's especially neat because my daughter and I worked together on this
> project. We used it to track her two pet gerbils, as part of her science
> fair project. She wrote her own (separate) Python script to read the
> motion tracking log files, compute distance and velocity, and then
> export those values in a CSV file. Like I say on the web page: "I?m
> convinced that Python is the best language currently available for
> teaching kids how to program."
> 
> I also use Python professionally, and it's worked out great every time.
> There's no job Python can't handle.
> 
> 
> Thanks,
> Derek Simkowiak
> http://derek.simkowiak.net

Hi, this is awesome!!
 I'm currently working in something similar, but I am having problems with 
getting data from the CCD (basically i don't know how to do it :), can you 
give me a tip for doing this? Or explain how you did it please?
I not a newbie at python but not as experienced as evidently you are.
Thanks a lot in advance.

-- 
(...)Also, since that same law states that any system able to prove its 
consistency to itself must be inconsistent; any mind that believes it can 
prove its own sanity is, therefore, insane.(...) 
Kurt G?del. 
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From rantingrick at gmail.com  Fri Sep 30 10:19:20 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 07:19:20 -0700 (PDT)
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<1139d178-3a74-4234-b458-4005ca426750@i28g2000yqn.googlegroups.com>
	<mailman.1606.1317358215.27778.python-list@python.org>
Message-ID: <7d5a7284-6f73-42f7-9386-14cb5e6e69b2@z8g2000yqb.googlegroups.com>

On Sep 29, 11:49?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
> Nope, that doesn't work.
>
> >>> "{0:0>10}".format("-1234")
>
> '00000-1234'
>
> The whole point of zfill is that it handles signs correctly.

py> "{0:-010d}".format(-1234)
'-000001234'

My point was: Use the {char}{repeat}d format for integers and the
{char}{<|>|=}{repeat} for strings. Problem solved. No more need for
zfill.

py> "{0:0>10}".format(-1234)
'00000-1234'

What result would you expect from that string argument? I think it
behaves as anyone would expect. If you have a str and you want it
interpreted as a negative integer then cast it.

py> "{0:010d}".format(int("-1234"))
'-000001234'

If you would like for the spec to handle the case of integers and
strings transparently then you need to lobby to have the API changed.
Maybe they could add a !i like the !s and !r which would be explicit.
However, i don't think implicit coercion of strings to integers is a
good idea. Using the int function or !i removes and ambiguities.

For me, the spec works just fine as is.


From rosuav at gmail.com  Fri Sep 30 10:43:15 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 00:43:15 +1000
Subject: Suggested coding style
In-Reply-To: <27620bc4-edd2-473e-809f-18f17b426b4f@db5g2000vbb.googlegroups.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<27620bc4-edd2-473e-809f-18f17b426b4f@db5g2000vbb.googlegroups.com>
Message-ID: <CAPTjJmqMb=-Dv6T2=a3WZ85x=OvP1V1ktMMUCMQ5QuQswDgjhA@mail.gmail.com>

On Fri, Sep 30, 2011 at 11:54 PM, rantingrick <rantingrick at gmail.com> wrote:
> Well "alex", like yourself, i hold expertise in many fields BESIDES
> programming. One of which being psychology.
>

I *knew* it! We're all part of a huge experiment to see how much the
human psyche can withstand. If we succeed on the Rick test, do we
"level up" and get a second troll to deal with, or is this MST3K-style
eternity?

ChrisA


From devplayer at gmail.com  Fri Sep 30 10:59:27 2011
From: devplayer at gmail.com (DevPlayer)
Date: Fri, 30 Sep 2011 07:59:27 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
Message-ID: <c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>

I still assert that contradiction is caused by narrow perspective.

By that I mean: just because an objects scope may not see a certain
condition, doesn't mean that condition is non-existant.

I also propose that just because something seems to contradict doesn't
mean it is false. Take for instance:

Look out your window. Is it daylight or night time? You may say it is
daylight or you may say it is night time. I would disagree that only
one of those conditions are true. Both conditions are true. Always. It
is only day (or night) for YOU. But the opposite DOES in fact exist on
the other side of the world at the same time.

I call this Duality of Nature (and I believe there was some religion
somewhere in some time that has the same notion, Budism I think but I
could be mistaken). I see such "contradictions" in what appears to be
most truths.

If I am correct; not sure here; but I think that is part of the new
math Choas theory. (The notion that not all variables are known and
the results of well defined functions may result in completely
different actual outcomes) [Missing variables in such data sets and
functions, to me is basically a narrow(er) perspective of the all the
revelent factors for such computations.]

You could think of this in terms of classes and attributes if you
want. Just because an object does not see an attribute, like "has_
connection", doesn't mean the app doesn't have a connection to the
server, just that that object doesn't have access to the existance of
that attribute, because it is not in scope (ie narrow perspective).

I propose that if something seems to contradict itself, that that
doesnt' invalidate its value outright. It -could- invalidate its
value, but doesn't guarentee no value.

How this matters to coding style? No connection visible. It's just a
proposed notion.


From breamoreboy at yahoo.co.uk  Fri Sep 30 11:51:37 2011
From: breamoreboy at yahoo.co.uk (Blockheads Oi Oi)
Date: Fri, 30 Sep 2011 08:51:37 -0700 (PDT)
Subject: Installing Python 2.6.7 on Windows
References: <52b1c0e2-7b6b-4623-bc70-040a792bc7dc@k6g2000yql.googlegroups.com>
	<42e816bf-c433-472a-b21e-229bd092c57a@n12g2000yqh.googlegroups.com>
	<1e8d7957-3462-4f00-bae5-09989e4d9ad7@i30g2000yqd.googlegroups.com>
	<4e82a1a1$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<42df7e77-44ab-405e-9c60-8f394e3e5628@d17g2000yqa.googlegroups.com>
Message-ID: <9b034444-a387-4f73-9c0c-08c159cd3017@dm9g2000vbb.googlegroups.com>

On Sep 29, 2:59?am, rantingrick <rantingr... at gmail.com> wrote:
> On Sep 27, 11:25?pm, Steven D'Aprano <steve
>
> +comp.lang.pyt... at pearwood.info> wrote:
> > The Python development team is relatively small and chronically busy: too
> > much to do and not enough time to do it.
>
> If that is the case then why do they snub their noses at anyone who
> wishes to help? What kind of people would chase off good help just to
> save ego? I imagine the folks at py dev sort of like a dying man in
> need of a heart transplant; the man informs the doctor that he would
> happy to get a transplant but not if the heart came from a jew, asian,
> african, latin, russian, or canuck.

For the uninitiated, rr is to Python what King Herod was to baby
sitting. (With apologies to Tommy Docherty)


From neilc at norwich.edu  Fri Sep 30 11:58:24 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 30 Sep 2011 15:58:24 GMT
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
Message-ID: <9em790Fnj9U1@mid.individual.net>

On 2011-09-30, DevPlayer <devplayer at gmail.com> wrote:
> I still assert that contradiction is caused by narrow perspective.
>
> By that I mean: just because an objects scope may not see a certain
> condition, doesn't mean that condition is non-existant.
>
> I also propose that just because something seems to contradict doesn't
> mean it is false. Take for instance:
>
> Look out your window. Is it daylight or night time? You may say
> it is daylight or you may say it is night time. I would
> disagree that only one of those conditions are true. Both
> conditions are true. Always. It is only day (or night) for YOU.
> But the opposite DOES in fact exist on the other side of the
> world at the same time.
> 
> I call this Duality of Nature (and I believe there was some
> religion somewhere in some time that has the same notion,
> Budism I think but I could be mistaken). I see such
> "contradictions" in what appears to be most truths.

You are not alone. Many ancient philosophers, fathers of
religious and scientific thought, thought the same.

They thought that contradictory qualities could exist in objects
simultaneously. For example, they thought that a cat was both big
and small, because it was big compared to a mouse and small
compared to a house. They didn't notice that big and small were
not poperties of the cat, at all but were instead statements
about how a cat relates to another object.

When you say, "It is night," you are making an assertion about a
position on the surface of the earth and its relationship to the
sun.

If you are not discussing a specific a position on the Earth,
then you cannot make a meaningful assertion about night or day at
all. Night and Day are not qualities of the entire Earth, but
only of positions on the Earth.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From ramit.prasad at jpmorgan.com  Fri Sep 30 12:06:19 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 12:06:19 -0400
Subject: Suggested coding style
In-Reply-To: <CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>

>May I suggest a[n] email client that can group mailing list threads?

Please do. Bonus points if it handles threading in a Gmail-like style.

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan.com at python.org [mailto:python-list-bounces+ramit.prasad=jpmorgan.com at python.org] On Behalf Of Devin Jeanpierre
Sent: Thursday, September 29, 2011 6:07 PM
To: rantingrick
Cc: python-list at python.org
Subject: Re: Suggested coding style

> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)

Yeah. It's a much more difficult to read thing, but once you learn how
to write it it flows faster.

Of course, I never managed to learn how to write it...

I would suggest that rather than being "complicated" it is "dense".

> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.

Devin

On Thu, Sep 29, 2011 at 6:56 PM, rantingrick <rantingrick at gmail.com> wrote:
> On Sep 29, 5:12?pm, Ian Kelly <ian.g.ke... at gmail.com> wrote:
>> On Thu, Sep 29, 2011 at 6:23 AM, rantingrick <rantingr... at gmail.com> wrote:
>> > A specific method for padding a string with ONLY zeros is ludicrous
>> > and exposes the narrow mindedness of the creator. The only thing worse
>> > than "zfill" as a string method is making zfill into built-in
>> > function! The ONLY proper place for zfill is as an option in the
>> > str.format() method.
>>
>> > py> "{0:zf10}".format(1234) -> "00000000001234"
>>
>> Agree that zfill seems to be redundant with str.format, although your
>> suggested syntax is atrocious, especially since a syntax already
>> exists that fits better in the already-complicated format specifier
>> syntax.
>
> It's interesting that you find the format specifier "complicated". I
> will admit that upon first glance i lamented the new format method
> spec and attempted to cling to the old string interpolation crap.
> However, as you use the new format method you will come to appreciate
> it. It's an adult beverage with an acquired taste. ;-)
>
> One thing that may help format noobs is to look at the spec as two
> parts; the part before the colon and the part after the colon. If you
> break it down in this manner the meaning starts to shine through. I
> will agree, it is a lot of cryptic info squeezed into a small space
> HOWEVER you would no want a verbose format specification.
>
> But i wholeheartedly agree with you points and i would say the zfill
> method has no future uses in the stdlib except for historical reasons.
> We should deprecate it now.
>
>
>> "{0:=010d}".format(1234) -> "0000001234"
>>
>> There are a couple of warts with the existing implementation, however:
>>
>> 1) str.zfill() operates on strings; the .format() syntax operates on
>> numeric types. ?I would suggest that the "=" fill alignment in format
>> specifiers should be extended to do the same thing as zfill when given
>> a string.
>
> EXACTLY!
>
> PS: Has anyone noticed all the off topic chatter about religion and
> feelings? Since the main subject of this thread is about zfill i can't
> help but wonder if the minions where sent out to present a distraction
> with "scripted" pseudo arguments. Just an observation.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-- 
http://mail.python.org/mailman/listinfo/python-list

This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From rustompmody at gmail.com  Fri Sep 30 12:22:59 2011
From: rustompmody at gmail.com (rusi)
Date: Fri, 30 Sep 2011 09:22:59 -0700 (PDT)
Subject: Benefit and belief
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
Message-ID: <55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>

On Sep 30, 8:58?pm, Neil Cerutti <ne... at norwich.edu> wrote:
> On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
>
>
>
> > I still assert that contradiction is caused by narrow perspective.
>
> > By that I mean: just because an objects scope may not see a certain
> > condition, doesn't mean that condition is non-existant.
>
> > I also propose that just because something seems to contradict doesn't
> > mean it is false. Take for instance:
>
> > Look out your window. Is it daylight or night time? You may say
> > it is daylight or you may say it is night time. I would
> > disagree that only one of those conditions are true. Both
> > conditions are true. Always. It is only day (or night) for YOU.
> > But the opposite DOES in fact exist on the other side of the
> > world at the same time.
>
> > I call this Duality of Nature (and I believe there was some
> > religion somewhere in some time that has the same notion,
> > Budism I think but I could be mistaken). I see such
> > "contradictions" in what appears to be most truths.
>
> You are not alone. Many ancient philosophers, fathers of
> religious and scientific thought, thought the same.
>
> They thought that contradictory qualities could exist in objects
> simultaneously. For example, they thought that a cat was both big
> and small, because it was big compared to a mouse and small
> compared to a house. They didn't notice that big and small were
> not poperties of the cat, at all but were instead statements
> about how a cat relates to another object.
>
> When you say, "It is night," you are making an assertion about a
> position on the surface of the earth and its relationship to the
> sun.
>
> If you are not discussing a specific a position on the Earth,
> then you cannot make a meaningful assertion about night or day at
> all. Night and Day are not qualities of the entire Earth, but
> only of positions on the Earth.

But just imagine that we were all pre-galiliean savages -- knowing
nothing about the roundness of the earth, the earth going round and so
on and somehow you and I get on the phone and we start arguing:
Rusi: Its 9:30 pm
Neil: No its 12 noon

How many cases are there?
We both may be right, I may be wrong (my watch may have stopped) or we
both etc

ie conflicting data may get resolved within a larger world view (which
is what devplayer is probably saying).

Until then it is wiser to assume that that larger world view exists
(and I dont yet know it)
than to assume that since I dont know it it does not exist.

For me (admittedly an oriental) such agnosticism (literally "I-do-not-
know-ness") is as much a foundation for true religiosity as effective
science.


From anikom15 at gmail.com  Fri Sep 30 12:36:38 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Fri, 30 Sep 2011 09:36:38 -0700
Subject: Benefit and belief
In-Reply-To: <55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
	<55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
Message-ID: <20110930163638.GA13519@Smoke>

On Fri, Sep 30, 2011 at 09:22:59AM -0700, rusi wrote:
> On Sep 30, 8:58?pm, Neil Cerutti <ne... at norwich.edu> wrote:
> > On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
> >
> >
> >
> > > I still assert that contradiction is caused by narrow perspective.
> >
> > > By that I mean: just because an objects scope may not see a certain
> > > condition, doesn't mean that condition is non-existant.
> >
> > > I also propose that just because something seems to contradict doesn't
> > > mean it is false. Take for instance:
> >
> > > Look out your window. Is it daylight or night time? You may say
> > > it is daylight or you may say it is night time. I would
> > > disagree that only one of those conditions are true. Both
> > > conditions are true. Always. It is only day (or night) for YOU.
> > > But the opposite DOES in fact exist on the other side of the
> > > world at the same time.
> >
> > > I call this Duality of Nature (and I believe there was some
> > > religion somewhere in some time that has the same notion,
> > > Budism I think but I could be mistaken). I see such
> > > "contradictions" in what appears to be most truths.
> >
> > You are not alone. Many ancient philosophers, fathers of
> > religious and scientific thought, thought the same.
> >
> > They thought that contradictory qualities could exist in objects
> > simultaneously. For example, they thought that a cat was both big
> > and small, because it was big compared to a mouse and small
> > compared to a house. They didn't notice that big and small were
> > not poperties of the cat, at all but were instead statements
> > about how a cat relates to another object.
> >
> > When you say, "It is night," you are making an assertion about a
> > position on the surface of the earth and its relationship to the
> > sun.
> >
> > If you are not discussing a specific a position on the Earth,
> > then you cannot make a meaningful assertion about night or day at
> > all. Night and Day are not qualities of the entire Earth, but
> > only of positions on the Earth.
> 
> But just imagine that we were all pre-galiliean savages -- knowing
> nothing about the roundness of the earth, the earth going round and so
> on and somehow you and I get on the phone and we start arguing:
> Rusi: Its 9:30 pm
> Neil: No its 12 noon
> 
> How many cases are there?
> We both may be right, I may be wrong (my watch may have stopped) or we
> both etc
> 
> ie conflicting data may get resolved within a larger world view (which
> is what devplayer is probably saying).
> 
> Until then it is wiser to assume that that larger world view exists
> (and I dont yet know it)
> than to assume that since I dont know it it does not exist.
> 
> For me (admittedly an oriental) such agnosticism (literally "I-do-not-
> know-ness") is as much a foundation for true religiosity as effective
> science

I.e. humility?


From irmen.NOSPAM at xs4all.nl  Fri Sep 30 12:40:32 2011
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Fri, 30 Sep 2011 18:40:32 +0200
Subject: Motion Tracking with Python
In-Reply-To: <mailman.1603.1317355329.27778.python-list@python.org>
References: <mailman.1603.1317355329.27778.python-list@python.org>
Message-ID: <4e85f0ff$0$2529$e4fe514c@news2.news.xs4all.nl>

On 30-9-2011 4:16, Derek Simkowiak wrote:
> Hello,
> I have a neat Python project I'd like to share. It does real-time motion tracking, using
> the Python bindings to the OpenCV library:
> 
> http://derek.simkowiak.net/motion-tracking-with-python/
> 
> There is a YouTube video showing the script in action.
> 
> It's especially neat because my daughter and I worked together on this project. We used
> it to track her two pet gerbils, as part of her science fair project. She wrote her own
> (separate) Python script to read the motion tracking log files, compute distance and
> velocity, and then export those values in a CSV file. Like I say on the web page: "I?m
> convinced that Python is the best language currently available for teaching kids how to
> program."

Wow. Very impressive and very enjoyable to read about it. How was her project received
at school?

Thanks a lot for sharing this.

Irmen de Jong


From ladasky at my-deja.com  Fri Sep 30 12:40:46 2011
From: ladasky at my-deja.com (John Ladasky)
Date: Fri, 30 Sep 2011 09:40:46 -0700 (PDT)
Subject: Simplest way to resize an image-like array
Message-ID: <fb126bd8-7b71-4e61-b44d-95848c591d97@t11g2000yqa.googlegroups.com>

Hi folks,

I have 500 x 500 arrays of floats, representing 2D "grayscale" images,
that I need to resample at a lower spatial resolution, say, 120 x 120
(details to follow, if you feel they are relevant).

I've got the numpy, and scipy, and matplotlib. All of these packages
hint at the fact that they have the capability to resample an image-
like array.  But after reading the documentation for all of these
packages, none of them make it straightforward, which surprises me.
For example, there are several spline and interpolation methods in
scipy.interpolate.  They seem to return interpolator classes rather
than arrays.  Is there no simple method which then calls the
interpolator, and builds the resampled array?

Yes, I can do this myself if I must -- but over the years, I've come
to learn that a lot of the code I want is already written, and that
sometimes I just have to know where to look for it.

Thanks!


From rosuav at gmail.com  Fri Sep 30 12:41:30 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 02:41:30 +1000
Subject: Benefit and belief
In-Reply-To: <j64r9v$v63$1@dough.gmane.org>
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<j64r9v$v63$1@dough.gmane.org>
Message-ID: <CAPTjJmqDxZ2bx6CKfqQOoNHre7L0+ZBJQeDiy6u24Nj9xhY9Yw@mail.gmail.com>

On Sat, Oct 1, 2011 at 2:38 AM, Dennis Lee Bieber <wlfraed at ix.netcom.com> wrote:
> ? ? ? ?And I would argue that by starting with "Look out your window..."
> you have explicitly excluded the rest of the world from consideration in
> answering; you have narrowed the focus to only the region visible from
> "my window".
>

But what if I'm a great windowing magnate, owning windows all over the world?

(Is anyone else amused by this thread and its ridiculosity?)

ChrisA


From rustompmody at gmail.com  Fri Sep 30 12:49:21 2011
From: rustompmody at gmail.com (rusi)
Date: Fri, 30 Sep 2011 09:49:21 -0700 (PDT)
Subject: Benefit and belief
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<j64r9v$v63$1@dough.gmane.org>
	<mailman.1630.1317400892.27778.python-list@python.org>
Message-ID: <e27fa9f0-c989-4d6c-94cd-b6857371fd8b@m5g2000vbe.googlegroups.com>

On Sep 30, 9:41?pm, Chris Angelico <ros... at gmail.com> wrote:
> On Sat, Oct 1, 2011 at 2:38 AM, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
>
> > ? ? ? ?And I would argue that by starting with "Look out your window..."
> > you have explicitly excluded the rest of the world from consideration in
> > answering; you have narrowed the focus to only the region visible from
> > "my window".
>
> But what if I'm a great windowing magnate, owning windows all over the world?
>
> (Is anyone else amused by this thread and its ridiculosity?)
>
> ChrisA

Not more ridiculous than people getting religious over not just about
silly (man-made) languages but even over the editors they use <wink>


From ramit.prasad at jpmorgan.com  Fri Sep 30 12:56:46 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 12:56:46 -0400
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
In-Reply-To: <4e853541$0$29997$c3e8da3$5496439d@news.astraweb.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<8d467d85-355b-41b5-8ed0-8d465b4f5476@12g2000vbu.googlegroups.com>
	<d3568630-7fa9-4784-a6a6-081c462d0d01@b6g2000vbz.googlegroups.com>
	<ee7076f7-d7ae-422f-ab69-e4d0efd12892@z20g2000vbl.googlegroups.com>
	<4e83c65d$0$29997$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1549.1317260469.27778.python-list@python.org>
	<87zkho2glb.fsf@benfinney.id.au>	<4E847A8F.3070401@mrabarnett.plus.com>
	<mailman.1590.1317332020.27778.python-list@python.org>
	<4e852b8a$0$29979$c3e8da3$5496439d@news.astraweb.com>
	<mailman.1601.1317350900.27778.python-list@python.org>
	<4e853541$0$29997$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677B6@EMARC112VS01.exchad.jpmchase.net>

>I didn't say it would be on-topic. But we don't cease to be well-rounded
>human beings with concerns beyond the narrow world of Python programming
>just because we are writing on a programming forum.

Everything is on topic to programmers! To (mis)quote Sheldon Cooper: "I'm a [programmer]. I have a working knowledge of the entire universe and everything it contains."

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423





This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  

From rosuav at gmail.com  Fri Sep 30 12:59:31 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 02:59:31 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>

On Sat, Oct 1, 2011 at 2:06 AM, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>May I suggest a[n] email client that can group mailing list threads?
>
> Please do. Bonus points if it handles threading in a Gmail-like style.
>

May I suggest Gmail? It handles threading in a very Gmail-like style.

ChrisA
running and ducking


From ramit.prasad at jpmorgan.com  Fri Sep 30 13:05:27 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 13:05:27 -0400
Subject: Suggested coding style
In-Reply-To: <CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
	<CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>

>> Please do. Bonus points if it handles threading in a Gmail-like style.
>>
>
>May I suggest Gmail? It handles threading in a very Gmail-like style.

Curses, foiled by my lack of specificity! I meant desktop client. Although...if another website does similar threading it would be good to know. Never know when I will want to start avoiding Gmail :)

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423


This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ethan at stoneleaf.us  Fri Sep 30 13:10:32 2011
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 30 Sep 2011 10:10:32 -0700
Subject: Benefit and belief
In-Reply-To: <e27fa9f0-c989-4d6c-94cd-b6857371fd8b@m5g2000vbe.googlegroups.com>
References: <87zkho2glb.fsf@benfinney.id.au>	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>	<20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>	<mailman.1599.1317339426.27778.python-list@python.org>	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>	<j64r9v$v63$1@dough.gmane.org>	<mailman.1630.1317400892.27778.python-list@python.org>
	<e27fa9f0-c989-4d6c-94cd-b6857371fd8b@m5g2000vbe.googlegroups.com>
Message-ID: <4E85F808.9040100@stoneleaf.us>

rusi wrote:
> On Sep 30, 9:41 pm, Chris Angelico <ros... at gmail.com> wrote:
>> On Sat, Oct 1, 2011 at 2:38 AM, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
>>
>>>        And I would argue that by starting with "Look out your window..."
>>> you have explicitly excluded the rest of the world from consideration in
>>> answering; you have narrowed the focus to only the region visible from
>>> "my window".
>> But what if I'm a great windowing magnate, owning windows all over the world?
>>
>> (Is anyone else amused by this thread and its ridiculosity?)
>>
>> ChrisA
> 
> Not more ridiculous than people getting religious over not just about
> silly (man-made) languages but even over the editors they use <wink>

No kidding!  Vim is *obviously* the best one out there!  *ducks and runs*

~Ethan~


From paul.nospam at rudin.co.uk  Fri Sep 30 13:11:36 2011
From: paul.nospam at rudin.co.uk (Paul Rudin)
Date: Fri, 30 Sep 2011 18:11:36 +0100
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
Message-ID: <871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>

"Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:

>>May I suggest a[n] email client that can group mailing list threads?
>
> Please do. Bonus points if it handles threading in a Gmail-like style.

The answer to any news/mail client with feature X type question is
normally "gnus" - although I don't know what "Gmail-like style" is.


From rosuav at gmail.com  Fri Sep 30 13:12:02 2011
From: rosuav at gmail.com (Chris Angelico)
Date: Sat, 1 Oct 2011 03:12:02 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
	<CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAPTjJmqKDyv9ZMu8jo+xShtHBz2-7DUV-p=DNP7gywXPbGLMzA@mail.gmail.com>

On Sat, Oct 1, 2011 at 3:05 AM, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
> Curses, foiled by my lack of specificity! I meant desktop client. Although...if another website does similar threading it would be good to know. Never know when I will want to start avoiding Gmail :)
>

Ah, *desktop* client! Hm. I actually can't advise there; since I'm
constantly mobile, I use webmail for everything - installed Squirrel
Mail and RoundCube on my server for remote access. Neither does
threading though afaik; nor does PMMail (which is a desktop client).

ChrisA


From neilc at norwich.edu  Fri Sep 30 13:12:26 2011
From: neilc at norwich.edu (Neil Cerutti)
Date: 30 Sep 2011 17:12:26 GMT
Subject: Suggested coding style
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
Message-ID: <9embjqFb8uU1@mid.individual.net>

On 2011-09-30, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
> "Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:
>
>>>May I suggest a[n] email client that can group mailing list threads?
>>
>> Please do. Bonus points if it handles threading in a Gmail-like style.
>
> The answer to any news/mail client with feature X type question is
> normally "gnus" - although I don't know what "Gmail-like style" is.

slrn. Is good.

-- 
Neil Cerutti
"A politician is an arse upon which everyone has sat except a man."
  e. e. cummings 


From alec.taylor6 at gmail.com  Fri Sep 30 13:19:20 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 1 Oct 2011 03:19:20 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F67661@EMARC112VS01.exchad.jpmchase.net>
	<CAPTjJmoVehZUw0nPQgmay+VBDhS933wuQnQXk3U_6rcs8WfuFg@mail.gmail.com>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F677EE@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAO+9iGdGiK0O8OeqHd4KogC7B7Cw75oLb+wX=ZUmQn+9PD2BFQ@mail.gmail.com>

Maybe one Apache's Buzz?

On 10/1/11, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>> Please do. Bonus points if it handles threading in a Gmail-like style.
>>>
>>
>>May I suggest Gmail? It handles threading in a very Gmail-like style.
>
> Curses, foiled by my lack of specificity! I meant desktop client.
> Although...if another website does similar threading it would be good to
> know. Never know when I will want to start avoiding Gmail :)
>
> Ramit
>
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available at http://www.jpmorgan.com/pages/disclosures/email.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From alec.taylor6 at gmail.com  Fri Sep 30 13:26:00 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 1 Oct 2011 03:26:00 +1000
Subject: Suggested coding style
In-Reply-To: <9embjqFb8uU1@mid.individual.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
Message-ID: <CAO+9iGcuodGt_GSuVORJr3h5uOChPDk_nuAhZpp61=oekt8YXw@mail.gmail.com>

http://incubator.apache.org/wave/

On 10/1/11, Neil Cerutti <neilc at norwich.edu> wrote:
> On 2011-09-30, Paul Rudin <paul.nospam at rudin.co.uk> wrote:
>> "Prasad, Ramit" <ramit.prasad at jpmorgan.com> writes:
>>
>>>>May I suggest a[n] email client that can group mailing list threads?
>>>
>>> Please do. Bonus points if it handles threading in a Gmail-like style.
>>
>> The answer to any news/mail client with feature X type question is
>> normally "gnus" - although I don't know what "Gmail-like style" is.
>
> slrn. Is good.
>
> --
> Neil Cerutti
> "A politician is an arse upon which everyone has sat except a man."
>   e. e. cummings
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ramit.prasad at jpmorgan.com  Fri Sep 30 13:45:21 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 13:45:21 -0400
Subject: Suggested coding style
In-Reply-To: <9embjqFb8uU1@mid.individual.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>

>>>>May I suggest a[n] email client that can group mailing list threads?

> The answer to any news/mail client with feature X type question is
> normally "gnus" - although I don't know what "Gmail-like style" is.
Yeah

>slrn. Is good.
Unless I am missing something, it does not do email.

>http://incubator.apache.org/wave/
Are you suggesting I run my own webserver to aggregate emails, stick them in wave, and then write something that will convert my wave post to email? I suppose it could work, but that is *usually* not what is considered a "desktop app".

> Maybe one Apache's Buzz?
I think you will have to Google that one for me, as the first results I found were Apache Wicket and Apache Beehive...both which seem not related.


Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423



This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From ramit.prasad at jpmorgan.com  Fri Sep 30 13:48:25 2011
From: ramit.prasad at jpmorgan.com (Prasad, Ramit)
Date: Fri, 30 Sep 2011 13:48:25 -0400
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678F0@EMARC112VS01.exchad.jpmchase.net>

>> The answer to any news/mail client with feature X type question is 
>> normally "gnus" - although I don't know what "Gmail-like style" is.
>Yeah

Gah, I got distracted mid-email and forgot to finish. What I wanted to say was, "Yeah, not knowing what 'Gmail-like style' makes a big difference ;)".

Ramit


Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423




This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.  


From rantingrick at gmail.com  Fri Sep 30 14:08:16 2011
From: rantingrick at gmail.com (rantingrick)
Date: Fri, 30 Sep 2011 11:08:16 -0700 (PDT)
Subject: Benefit and belief
References: <87zkho2glb.fsf@benfinney.id.au>
	<CABicbJLFn+M+XtE69Pji26_+_Ponutsrt1AQmfUgLb2bcpKwHg@mail.gmail.com>
	<20110929220132.GD2715@benfinney.id.au> <4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
	<55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
	<mailman.1628.1317400611.27778.python-list@python.org>
Message-ID: <cfb688fb-235c-48f4-ae18-de0ce89079b2@b6g2000vbz.googlegroups.com>

On Sep 30, 11:36?am, Westley Mart?nez <aniko... at gmail.com> wrote:
> On Fri, Sep 30, 2011 at 09:22:59AM -0700, rusi wrote:
> > On Sep 30, 8:58???pm, Neil Cerutti <ne... at norwich.edu> wrote:
> > > On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
>
> > > > I still assert that contradiction is caused by narrow perspective.
>
> > > > By that I mean: just because an objects scope may not see a certain
> > > > condition, doesn't mean that condition is non-existant.
>
> > > > I also propose that just because something seems to contradict doesn't
> > > > mean it is false. Take for instance:
>
> > > > Look out your window. Is it daylight or night time? You may say
> > > > it is daylight or you may say it is night time. I would
> > > > disagree that only one of those conditions are true. Both
> > > > conditions are true. Always. It is only day (or night) for YOU.
> > > > But the opposite DOES in fact exist on the other side of the
> > > > world at the same time.
>
> > > > I call this Duality of Nature (and I believe there was some
> > > > religion somewhere in some time that has the same notion,
> > > > Budism I think but I could be mistaken). I see such
> > > > "contradictions" in what appears to be most truths.
>
> > > You are not alone. Many ancient philosophers, fathers of
> > > religious and scientific thought, thought the same.
>
> > > They thought that contradictory qualities could exist in objects
> > > simultaneously. For example, they thought that a cat was both big
> > > and small, because it was big compared to a mouse and small
> > > compared to a house. They didn't notice that big and small were
> > > not poperties of the cat, at all but were instead statements
> > > about how a cat relates to another object.
>
> > > When you say, "It is night," you are making an assertion about a
> > > position on the surface of the earth and its relationship to the
> > > sun.
>
> > > If you are not discussing a specific a position on the Earth,
> > > then you cannot make a meaningful assertion about night or day at
> > > all. Night and Day are not qualities of the entire Earth, but
> > > only of positions on the Earth.
>
> > But just imagine that we were all pre-galiliean savages -- knowing
> > nothing about the roundness of the earth, the earth going round and so
> > on and somehow you and I get on the phone and we start arguing:
> > Rusi: Its 9:30 pm
> > Neil: No its 12 noon
>
> > How many cases are there?
> > We both may be right, I may be wrong (my watch may have stopped) or we
> > both etc
>
> > ie conflicting data may get resolved within a larger world view (which
> > is what devplayer is probably saying).
>
> > Until then it is wiser to assume that that larger world view exists
> > (and I dont yet know it)
> > than to assume that since I dont know it it does not exist.
>
> > For me (admittedly an oriental) such agnosticism (literally "I-do-not-
> > know-ness") is as much a foundation for true religiosity as effective
> > science
>
> I.e. humility?

@DevPlayer, rusi, Neil, Wes, and group

Yes, there are two views of reality; that of the absolute and that of
the relative. Both are true. It is always daytime and nighttime
simultaneously; if you look at things from a global perspective.

However, the true nature of "daytime vs nighttime" is purely a
relative observation. The fact that both exist does not falsify the
validity of the relative view. Recognizing the paradox is important
and proves you are not confined to your own selfish view points and
are in fact an intelligent being.


From rbotting at csusb.edu  Fri Sep 30 14:34:37 2011
From: rbotting at csusb.edu (RJB)
Date: Fri, 30 Sep 2011 11:34:37 -0700 (PDT)
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
Message-ID: <a59fdb41-baae-4f3b-b8bf-1ce89b0f2177@z19g2000vby.googlegroups.com>

On Sep 29, 3:52?am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Alain Ketterlin wrote:
> > Steven D'Aprano <steve+comp.lang.pyt... at pearwood.info> writes:
>
> >> I have a Python script which I would like to test without a tty attached
> >> to the process. I could run it as a cron job, but is there an easier way?
>
> >> I am running Linux.
>
> > Isn't os.setsid() what you're looking for? It makes the calling process
> > have no controlling terminal. There's also a user command called setsid
> > that should have the same effect.
>
> It doesn't appear so to me.
>
> [steve at sylar ~]$ tty
> /dev/pts/16
> [steve at sylar ~]$ setsid tty
> /dev/pts/16
>
> [steve at sylar ~]$ python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
> [steve at sylar ~]$ setsid python -c "import sys,os; print os.isatty(sys.stdout.fileno())"
> True
>
> If I run the same Python command (without the setsid) as a cron job, I
> get False emailed to me. That's the effect I'm looking for.
>
> --
> Steven

You could try the old UNIX "nohup ... &" technique for running a
process in the background (the &) with no HangUP if you log out:

$ nohup python -c "import sys,os; print
os.isatty(sys.stdout.fileno())" &
appending output to nohup.out
$ cat nohup.out
False

But that is over kill I guess.

One worrying detail.... the definition of a running process in UNIX
implies is that it has standard input/output files open.
You'd be wise to make sure that they are connected to things that are
safe.... /dev/null.

Even so /dev/tty can be opened any way...

Hope this helps.


From derek at simkowiak.net  Fri Sep 30 14:42:57 2011
From: derek at simkowiak.net (Derek Simkowiak)
Date: Fri, 30 Sep 2011 11:42:57 -0700
Subject: Motion Tracking with Python
In-Reply-To: <201109300906.43128.rick.mansilla@gmail.com>
References: <4E852694.4080303@simkowiak.net>
	<201109300906.43128.rick.mansilla@gmail.com>
Message-ID: <4E860DB1.202@simkowiak.net>

 > /I am having problems with getting data from the CCD (basically i 
don't know how to do it :), can you give me a tip for doing this? Or 
explain how you did it please?/

     I am using the OpenCV library to grab images.  Here are the 
specific lines of code:

self.capture = cv.CaptureFromCAM(0)cv.SetCaptureProperty( self.capture, 
cv.CV_CAP_PROP_FRAME_WIDTH, 320 );cv.SetCaptureProperty( self.capture, 
cv.CV_CAP_PROP_FRAME_HEIGHT, 240 );frame = cv.QueryFrame(self.capture) # 
...this is done repeatedly in the main loop.


     These were copied from the examples that came with OpenCV.  I don't 
know if this will work under Windows.

     The source code to my script is available online; I recommend 
downloading it and playing with it.  Also, check out the OpenCV Python 
documentation.


Thanks,
Derek

On 09/30/2011 07:06 AM, Ricardo Mansilla wrote:
>
> On Thursday 29 September 2011 21:16:52 you wrote:
>
> > Hello,
>
> > I have a neat Python project I'd like to share. It does real-time motion
>
> > tracking, using the Python bindings to the OpenCV library:
>
> >
>
> > http://derek.simkowiak.net/motion-tracking-with-python/
>
> >
>
> > There is a YouTube video showing the script in action.
>
> >
>
> > It's especially neat because my daughter and I worked together on this
>
> > project. We used it to track her two pet gerbils, as part of her science
>
> > fair project. She wrote her own (separate) Python script to read the
>
> > motion tracking log files, compute distance and velocity, and then
>
> > export those values in a CSV file. Like I say on the web page: "I?m
>
> > convinced that Python is the best language currently available for
>
> > teaching kids how to program."
>
> >
>
> > I also use Python professionally, and it's worked out great every time.
>
> > There's no job Python can't handle.
>
> >
>
> >
>
> > Thanks,
>
> > Derek Simkowiak
>
> > http://derek.simkowiak.net
>
> Hi, this is awesome!!
>
> I'm currently working in something similar, but I am having problems 
> with getting data from the CCD (basically i don't know how to do it 
> :), can you give me a tip for doing this? Or explain how you did it 
> please?
>
> I not a newbie at python but not as experienced as evidently you are.
>
> Thanks a lot in advance.
>
>
> -- 
>
> (...)Also, since that same law states that any system able to prove 
> its consistency to itself must be inconsistent; any mind that believes 
> it can prove its own sanity is, therefore, insane.(...)
>
> Kurt G?del.
>

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From derek at simkowiak.net  Fri Sep 30 14:48:26 2011
From: derek at simkowiak.net (Derek Simkowiak)
Date: Fri, 30 Sep 2011 11:48:26 -0700
Subject: Motion Tracking with Python
In-Reply-To: <4e85f0ff$0$2529$e4fe514c@news2.news.xs4all.nl>
References: <mailman.1603.1317355329.27778.python-list@python.org>
	<4e85f0ff$0$2529$e4fe514c@news2.news.xs4all.nl>
Message-ID: <4E860EFA.1020807@simkowiak.net>

>  /How was her project received at school?/


     She got an "Outstanding" blue ribbon award.  The teachers were 
impressed.

     (It was only a mandatory school project; it was not part of a 
regional competition or anything fancy like that.)

--Derek

On 09/30/2011 09:40 AM, Irmen de Jong wrote:
> On 30-9-2011 4:16, Derek Simkowiak wrote:
>> Hello,
>> I have a neat Python project I'd like to share. It does real-time motion tracking, using
>> the Python bindings to the OpenCV library:
>>
>> http://derek.simkowiak.net/motion-tracking-with-python/
>>
>> There is a YouTube video showing the script in action.
>>
>> It's especially neat because my daughter and I worked together on this project. We used
>> it to track her two pet gerbils, as part of her science fair project. She wrote her own
>> (separate) Python script to read the motion tracking log files, compute distance and
>> velocity, and then export those values in a CSV file. Like I say on the web page: "I?m
>> convinced that Python is the best language currently available for teaching kids how to
>> program."
> Wow. Very impressive and very enjoyable to read about it. How was her project received
> at school?
>
> Thanks a lot for sharing this.
>
> Irmen de Jong

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From anikom15 at gmail.com  Fri Sep 30 15:27:14 2011
From: anikom15 at gmail.com (Westley =?iso-8859-1?Q?Mart=EDnez?=)
Date: Fri, 30 Sep 2011 12:27:14 -0700
Subject: Benefit and belief
In-Reply-To: <cfb688fb-235c-48f4-ae18-de0ce89079b2@b6g2000vbz.googlegroups.com>
References: <20110929220132.GD2715@benfinney.id.au>
	<4E84FD75.5050907@stoneleaf.us>
	<mailman.1599.1317339426.27778.python-list@python.org>
	<284c7599-8c20-4535-9e23-f08b01760ba1@i33g2000yqm.googlegroups.com>
	<6720eaad-029c-48e2-bacf-318bc716b712@z12g2000yqz.googlegroups.com>
	<c04d134f-5f90-4fe8-b3e6-b08c6a1237ba@d18g2000yql.googlegroups.com>
	<9em790Fnj9U1@mid.individual.net>
	<55d21fe1-e833-4c8f-b6fb-032dba107244@fx14g2000vbb.googlegroups.com>
	<mailman.1628.1317400611.27778.python-list@python.org>
	<cfb688fb-235c-48f4-ae18-de0ce89079b2@b6g2000vbz.googlegroups.com>
Message-ID: <20110930192714.GA14314@Smoke>

On Fri, Sep 30, 2011 at 11:08:16AM -0700, rantingrick wrote:
> On Sep 30, 11:36?am, Westley Mart?nez <aniko... at gmail.com> wrote:
> > On Fri, Sep 30, 2011 at 09:22:59AM -0700, rusi wrote:
> > > On Sep 30, 8:58???pm, Neil Cerutti <ne... at norwich.edu> wrote:
> > > > On 2011-09-30, DevPlayer <devpla... at gmail.com> wrote:
> >
> > > > > I still assert that contradiction is caused by narrow perspective.
> >
> > > > > By that I mean: just because an objects scope may not see a certain
> > > > > condition, doesn't mean that condition is non-existant.
> >
> > > > > I also propose that just because something seems to contradict doesn't
> > > > > mean it is false. Take for instance:
> >
> > > > > Look out your window. Is it daylight or night time? You may say
> > > > > it is daylight or you may say it is night time. I would
> > > > > disagree that only one of those conditions are true. Both
> > > > > conditions are true. Always. It is only day (or night) for YOU.
> > > > > But the opposite DOES in fact exist on the other side of the
> > > > > world at the same time.
> >
> > > > > I call this Duality of Nature (and I believe there was some
> > > > > religion somewhere in some time that has the same notion,
> > > > > Budism I think but I could be mistaken). I see such
> > > > > "contradictions" in what appears to be most truths.
> >
> > > > You are not alone. Many ancient philosophers, fathers of
> > > > religious and scientific thought, thought the same.
> >
> > > > They thought that contradictory qualities could exist in objects
> > > > simultaneously. For example, they thought that a cat was both big
> > > > and small, because it was big compared to a mouse and small
> > > > compared to a house. They didn't notice that big and small were
> > > > not poperties of the cat, at all but were instead statements
> > > > about how a cat relates to another object.
> >
> > > > When you say, "It is night," you are making an assertion about a
> > > > position on the surface of the earth and its relationship to the
> > > > sun.
> >
> > > > If you are not discussing a specific a position on the Earth,
> > > > then you cannot make a meaningful assertion about night or day at
> > > > all. Night and Day are not qualities of the entire Earth, but
> > > > only of positions on the Earth.
> >
> > > But just imagine that we were all pre-galiliean savages -- knowing
> > > nothing about the roundness of the earth, the earth going round and so
> > > on and somehow you and I get on the phone and we start arguing:
> > > Rusi: Its 9:30 pm
> > > Neil: No its 12 noon
> >
> > > How many cases are there?
> > > We both may be right, I may be wrong (my watch may have stopped) or we
> > > both etc
> >
> > > ie conflicting data may get resolved within a larger world view (which
> > > is what devplayer is probably saying).
> >
> > > Until then it is wiser to assume that that larger world view exists
> > > (and I dont yet know it)
> > > than to assume that since I dont know it it does not exist.
> >
> > > For me (admittedly an oriental) such agnosticism (literally "I-do-not-
> > > know-ness") is as much a foundation for true religiosity as effective
> > > science
> >
> > I.e. humility?
> 
> @DevPlayer, rusi, Neil, Wes, and group
> 
> Yes, there are two views of reality; that of the absolute and that of
> the relative. Both are true. It is always daytime and nighttime
> simultaneously; if you look at things from a global perspective.
> 
> However, the true nature of "daytime vs nighttime" is purely a
> relative observation. The fact that both exist does not falsify the
> validity of the relative view. Recognizing the paradox is important
> and proves you are not confined to your own selfish view points and
> are in fact an intelligent being

What paradox?.


From alec.taylor6 at gmail.com  Fri Sep 30 15:57:13 2011
From: alec.taylor6 at gmail.com (Alec Taylor)
Date: Sat, 1 Oct 2011 05:57:13 +1000
Subject: Suggested coding style
In-Reply-To: <0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678F0@EMARC112VS01.exchad.jpmchase.net>
References: <cdbf5d7e-fb9a-4b9e-9567-7c9a7fd0d695@g33g2000yqc.googlegroups.com>
	<265946c5-3195-4f0e-896e-4e2e0a388525@k17g2000yqi.googlegroups.com>
	<16322983.302.1317292659565.JavaMail.geo-discussion-forums@yqlb4>
	<fe70d73d-b754-4fec-93bf-50211dd8b8c6@z8g2000yqb.googlegroups.com>
	<mailman.1593.1317334403.27778.python-list@python.org>
	<db336de2-531d-477c-81ed-55b127146c05@u13g2000vbx.googlegroups.com>
	<CABicbJJV5yvzVubvwG-5HFP5YVDZpgb664zbhxbn9Hd3pd+_gw@mail.gmail.com>
	<mailman.1631.1317401206.27778.python-list@python.org>
	<871uuy0xbr.fsf@no-fixed-abode.cable.virginmedia.net>
	<9embjqFb8uU1@mid.individual.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678D6@EMARC112VS01.exchad.jpmchase.net>
	<0604E20B5F6F2F4784C9C8C71C5DD4DD2F20F678F0@EMARC112VS01.exchad.jpmchase.net>
Message-ID: <CAO+9iGc3xd6CiUgR4YX=HDGuYKALOyKtORH9ROqmNH06v2+8og@mail.gmail.com>

Meh, so run your own web-server.

If wave isn't right, search on sourceforge for a while.

On 10/1/11, Prasad, Ramit <ramit.prasad at jpmorgan.com> wrote:
>>> The answer to any news/mail client with feature X type question is
>>> normally "gnus" - although I don't know what "Gmail-like style" is.
>>Yeah
>
> Gah, I got distracted mid-email and forgot to finish. What I wanted to say
> was, "Yeah, not knowing what 'Gmail-like style' makes a big difference ;)".
>
> Ramit
>
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
>
>
>
> This email is confidential and subject to important disclaimers and
> conditions including on offers for the purchase or sale of
> securities, accuracy and completeness of information, viruses,
> confidentiality, legal privilege, and legal entity disclaimers,
> available at http://www.jpmorgan.com/pages/disclosures/email.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From nobody at nowhere.com  Fri Sep 30 16:09:54 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 30 Sep 2011 21:09:54 +0100
Subject: Python without a tty
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
Message-ID: <pan.2011.09.30.20.09.53.397000@nowhere.com>

On Thu, 29 Sep 2011 11:53:12 +0200, Alain Ketterlin wrote:

>> I have a Python script which I would like to test without a tty attached 
>> to the process. I could run it as a cron job, but is there an easier way?
>>
>> I am running Linux.
> 
> Isn't os.setsid() what you're looking for? It makes the calling process
> have no controlling terminal. There's also a user command called setsid
> that should have the same effect.

setsid() requires that the calling process isn't a process group
leader; this can be achieved by fork()ing. The setsid command does this
automatically.

As you say, this ensures that the process has no controlling terminal
(i.e. it won't get signals from the tty driver for ^C, ^Z, hangup, etc).
It won't detach stdin etc from a terminal. Also, open()ing a tty will
result in it becoming the controlling terminal unless O_NOCTTY is used.

I suspect that the OP just wants e.g.:

	script.py &>/dev/null <&-

which will redirect stdout and stderr to /dev/null and close stdin.



From nobody at nowhere.com  Fri Sep 30 16:20:52 2011
From: nobody at nowhere.com (Nobody)
Date: Fri, 30 Sep 2011 21:20:52 +0100
Subject: Modifying external running process using python
References: <086bd803-ddc5-4913-b1f1-5fb6cb5848bb@i28g2000yqn.googlegroups.com>
Message-ID: <pan.2011.09.30.20.20.51.581000@nowhere.com>

On Thu, 29 Sep 2011 23:02:55 -0700, bingbang wrote:

> Beginner here. I am trying to figure out how to modify a running
> process on a linux system using Python.

> I looked up trace and some other modules but they all seem to do with
> following the currently executing python process.

ptrace() is the system call which programs such as gdb, strace, ltrace,
etc use to monitor or control another process. You wil probably need to
use ctypes to access this function from Python.

> Let's assume I have sudo/root privileges and that the POC code "only
> needs to work in linux".

You don't need root privilege to ptrace() a process which you own and
which isn't privileged (a process which starts out setuid/setgid is still
treated as privileged even if it reverts to the real user/group IDs).



From joncle at googlemail.com  Fri Sep 30 16:51:43 2011
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 30 Sep 2011 13:51:43 -0700 (PDT)
Subject: Simplest way to resize an image-like array
References: <fb126bd8-7b71-4e61-b44d-95848c591d97@t11g2000yqa.googlegroups.com>
Message-ID: <9b0b8951-bfc2-4047-8b4e-1ee0af20af27@q24g2000vby.googlegroups.com>

On Sep 30, 5:40?pm, John Ladasky <lada... at my-deja.com> wrote:
> Hi folks,
>
> I have 500 x 500 arrays of floats, representing 2D "grayscale" images,
> that I need to resample at a lower spatial resolution, say, 120 x 120
> (details to follow, if you feel they are relevant).
>
> I've got the numpy, and scipy, and matplotlib. All of these packages
> hint at the fact that they have the capability to resample an image-
> like array. ?But after reading the documentation for all of these
> packages, none of them make it straightforward, which surprises me.
> For example, there are several spline and interpolation methods in
> scipy.interpolate. ?They seem to return interpolator classes rather
> than arrays. ?Is there no simple method which then calls the
> interpolator, and builds the resampled array?
>
> Yes, I can do this myself if I must -- but over the years, I've come
> to learn that a lot of the code I want is already written, and that
> sometimes I just have to know where to look for it.
>
> Thanks!

Is something like http://docs.scipy.org/doc/scipy/reference/generated/scipy.misc.imresize.html#scipy.misc.imresize
any use?


From hansmu at xs4all.nl  Fri Sep 30 17:09:02 2011
From: hansmu at xs4all.nl (Hans Mulder)
Date: Fri, 30 Sep 2011 23:09:02 +0200
Subject: Python without a tty
In-Reply-To: <a59fdb41-baae-4f3b-b8bf-1ce89b0f2177@z19g2000vby.googlegroups.com>
References: <4e84388c$0$29965$c3e8da3$5496439d@news.astraweb.com>
	<87bou3wu7r.fsf@dpt-info.u-strasbg.fr>
	<4e844de7$0$29977$c3e8da3$5496439d@news.astraweb.com>
	<a59fdb41-baae-4f3b-b8bf-1ce89b0f2177@z19g2000vby.googlegroups.com>
Message-ID: <4e862fee$0$2438$e4fe514c@news2.news.xs4all.nl>

On 30/09/11 20:34:37, RJB wrote:
> You could try the old UNIX "nohup ...&" technique for running a
> process in the background (the&) with no HangUP if you log out:
>
> $ nohup python -c "import sys,os; print
> os.isatty(sys.stdout.fileno())"&
> appending output to nohup.out
> $ cat nohup.out
> False
>
> But that is over kill I guess.
>
> One worrying detail.... the definition of a running process in
> UNIX implies is that it has standard input/output files open.
> You'd be wise to make sure that they are connected to things
> that are safe.... /dev/null.
>
> Even so /dev/tty can be opened any way...

Not if you really detach from your tty: after you've detached,
there is no tty for /dev/tty to connect to and any attempt to
open it will raise IOError.

-- HansM



From navkirat.py at gmail.com  Fri Sep 30 23:25:54 2011
From: navkirat.py at gmail.com (Navkirat Singh)
Date: Sat, 1 Oct 2011 08:55:54 +0530
Subject: [OT] Off-Topic Posts and Threads on the Python Mailing List
Message-ID: <CAKzQzuvY-4b70HFRu2_uHicjfXmG-D3nM89b2gaEy2_LTijsUQ@mail.gmail.com>

Lol you all sound like google's angry birds with their feathers ruffled by a
comment. You guys should open up another mailing list to extinguish your
virtually bruised egos. . . .
On Sep 30, 2011 10:27 PM, "Prasad, Ramit" <ramit.prasad at jpmorgan.com> wrote:
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